diff options
Diffstat (limited to 'drivers/firmware/efi')
58 files changed, 17279 insertions, 0 deletions
diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig new file mode 100644 index 000000000..d9895491f --- /dev/null +++ b/drivers/firmware/efi/Kconfig @@ -0,0 +1,286 @@ +# SPDX-License-Identifier: GPL-2.0-only +menu "EFI (Extensible Firmware Interface) Support" + depends on EFI + +config EFI_VARS + tristate "EFI Variable Support via sysfs" + depends on EFI && (X86 || IA64) + default n + help + If you say Y here, you are able to get EFI (Extensible Firmware + Interface) variable information via sysfs. You may read, + write, create, and destroy EFI variables through this interface. + Note that this driver is only retained for compatibility with + legacy users: new users should use the efivarfs filesystem + instead. + +config EFI_ESRT + bool + depends on EFI && !IA64 + default y + +config EFI_VARS_PSTORE + tristate "Register efivars backend for pstore" + depends on PSTORE + default y + help + Say Y here to enable use efivars as a backend to pstore. This + will allow writing console messages, crash dumps, or anything + else supported by pstore to EFI variables. + +config EFI_VARS_PSTORE_DEFAULT_DISABLE + bool "Disable using efivars as a pstore backend by default" + depends on EFI_VARS_PSTORE + default n + help + Saying Y here will disable the use of efivars as a storage + backend for pstore by default. This setting can be overridden + using the efivars module's pstore_disable parameter. + +config EFI_RUNTIME_MAP + bool "Export efi runtime maps to sysfs" + depends on X86 && EFI && KEXEC_CORE + default y + help + Export efi runtime memory maps to /sys/firmware/efi/runtime-map. + That memory map is used for example by kexec to set up efi virtual + mapping the 2nd kernel, but can also be used for debugging purposes. + + See also Documentation/ABI/testing/sysfs-firmware-efi-runtime-map. + +config EFI_FAKE_MEMMAP + bool "Enable EFI fake memory map" + depends on EFI && X86 + default n + help + Saying Y here will enable "efi_fake_mem" boot option. + By specifying this parameter, you can add arbitrary attribute + to specific memory range by updating original (firmware provided) + EFI memmap. + This is useful for debugging of EFI memmap related feature. + e.g. Address Range Mirroring feature. + +config EFI_MAX_FAKE_MEM + int "maximum allowable number of ranges in efi_fake_mem boot option" + depends on EFI_FAKE_MEMMAP + range 1 128 + default 8 + help + Maximum allowable number of ranges in efi_fake_mem boot option. + Ranges can be set up to this value using comma-separated list. + The default value is 8. + +config EFI_SOFT_RESERVE + bool "Reserve EFI Specific Purpose Memory" + depends on EFI && EFI_STUB && ACPI_HMAT + default ACPI_HMAT + help + On systems that have mixed performance classes of memory EFI + may indicate specific purpose memory with an attribute (See + EFI_MEMORY_SP in UEFI 2.8). A memory range tagged with this + attribute may have unique performance characteristics compared + to the system's general purpose "System RAM" pool. On the + expectation that such memory has application specific usage, + and its base EFI memory type is "conventional" answer Y to + arrange for the kernel to reserve it as a "Soft Reserved" + resource, and set aside for direct-access (device-dax) by + default. The memory range can later be optionally assigned to + the page allocator by system administrator policy via the + device-dax kmem facility. Say N to have the kernel treat this + memory as "System RAM" by default. + + If unsure, say Y. + +config EFI_PARAMS_FROM_FDT + bool + help + Select this config option from the architecture Kconfig if + the EFI runtime support gets system table address, memory + map address, and other parameters from the device tree. + +config EFI_RUNTIME_WRAPPERS + bool + +config EFI_GENERIC_STUB + bool + +config EFI_ARMSTUB_DTB_LOADER + bool "Enable the DTB loader" + depends on EFI_GENERIC_STUB && !RISCV + default y + help + Select this config option to add support for the dtb= command + line parameter, allowing a device tree blob to be loaded into + memory from the EFI System Partition by the stub. + + If the device tree is provided by the platform or by + the bootloader this option may not be needed. + But, for various development reasons and to maintain existing + functionality for bootloaders that do not have such support + this option is necessary. + +config EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER + bool "Enable the command line initrd loader" if !X86 + depends on EFI_STUB && (EFI_GENERIC_STUB || X86) + default y + depends on !RISCV + help + Select this config option to add support for the initrd= command + line parameter, allowing an initrd that resides on the same volume + as the kernel image to be loaded into memory. + + This method is deprecated. + +config EFI_BOOTLOADER_CONTROL + tristate "EFI Bootloader Control" + default n + help + This module installs a reboot hook, such that if reboot() is + invoked with a string argument NNN, "NNN" is copied to the + "LoaderEntryOneShot" EFI variable, to be read by the + bootloader. If the string matches one of the boot labels + defined in its configuration, the bootloader will boot once + to that label. The "LoaderEntryRebootReason" EFI variable is + set with the reboot reason: "reboot" or "shutdown". The + bootloader reads this reboot reason and takes particular + action according to its policy. + +config EFI_CAPSULE_LOADER + tristate "EFI capsule loader" + depends on EFI + help + This option exposes a loader interface "/dev/efi_capsule_loader" for + users to load EFI capsules. This driver requires working runtime + capsule support in the firmware, which many OEMs do not provide. + + Most users should say N. + +config EFI_CAPSULE_QUIRK_QUARK_CSH + bool "Add support for Quark capsules with non-standard headers" + depends on X86 && !64BIT + select EFI_CAPSULE_LOADER + default y + help + Add support for processing Quark X1000 EFI capsules, whose header + layout deviates from the layout mandated by the UEFI specification. + +config EFI_TEST + tristate "EFI Runtime Service Tests Support" + depends on EFI + default n + help + This driver uses the efi.<service> function pointers directly instead + of going through the efivar API, because it is not trying to test the + kernel subsystem, just for testing the UEFI runtime service + interfaces which are provided by the firmware. This driver is used + by the Firmware Test Suite (FWTS) for testing the UEFI runtime + interfaces readiness of the firmware. + Details for FWTS are available from: + <https://wiki.ubuntu.com/FirmwareTestSuite> + + Say Y here to enable the runtime services support via /dev/efi_test. + If unsure, say N. + +config APPLE_PROPERTIES + bool "Apple Device Properties" + depends on EFI_STUB && X86 + select EFI_DEV_PATH_PARSER + select UCS2_STRING + help + Retrieve properties from EFI on Apple Macs and assign them to + devices, allowing for improved support of Apple hardware. + Properties that would otherwise be missing include the + Thunderbolt Device ROM and GPU configuration data. + + If unsure, say Y if you have a Mac. Otherwise N. + +config RESET_ATTACK_MITIGATION + bool "Reset memory attack mitigation" + depends on EFI_STUB + help + Request that the firmware clear the contents of RAM after a reboot + using the TCG Platform Reset Attack Mitigation specification. This + protects against an attacker forcibly rebooting the system while it + still contains secrets in RAM, booting another OS and extracting the + secrets. This should only be enabled when userland is configured to + clear the MemoryOverwriteRequest flag on clean shutdown after secrets + have been evicted, since otherwise it will trigger even on clean + reboots. + +config EFI_RCI2_TABLE + bool "EFI Runtime Configuration Interface Table Version 2 Support" + depends on X86 || COMPILE_TEST + help + Displays the content of the Runtime Configuration Interface + Table version 2 on Dell EMC PowerEdge systems as a binary + attribute 'rci2' under /sys/firmware/efi/tables directory. + + RCI2 table contains BIOS HII in XML format and is used to populate + BIOS setup page in Dell EMC OpenManage Server Administrator tool. + The BIOS setup page contains BIOS tokens which can be configured. + + Say Y here for Dell EMC PowerEdge systems. + +config EFI_DISABLE_PCI_DMA + bool "Clear Busmaster bit on PCI bridges during ExitBootServices()" + help + Disable the busmaster bit in the control register on all PCI bridges + while calling ExitBootServices() and passing control to the runtime + kernel. System firmware may configure the IOMMU to prevent malicious + PCI devices from being able to attack the OS via DMA. However, since + firmware can't guarantee that the OS is IOMMU-aware, it will tear + down IOMMU configuration when ExitBootServices() is called. This + leaves a window between where a hostile device could still cause + damage before Linux configures the IOMMU again. + + If you say Y here, the EFI stub will clear the busmaster bit on all + PCI bridges before ExitBootServices() is called. This will prevent + any malicious PCI devices from being able to perform DMA until the + kernel reenables busmastering after configuring the IOMMU. + + This option will cause failures with some poorly behaved hardware + and should not be enabled without testing. The kernel commandline + options "efi=disable_early_pci_dma" or "efi=no_disable_early_pci_dma" + may be used to override this option. + +endmenu + +config EFI_EMBEDDED_FIRMWARE + bool + depends on EFI + select CRYPTO_LIB_SHA256 + +config UEFI_CPER + bool + +config UEFI_CPER_ARM + bool + depends on UEFI_CPER && ( ARM || ARM64 ) + default y + +config UEFI_CPER_X86 + bool + depends on UEFI_CPER && X86 + default y + +config EFI_DEV_PATH_PARSER + bool + depends on ACPI + default n + +config EFI_EARLYCON + def_bool y + depends on EFI && SERIAL_EARLYCON && !ARM && !IA64 + select FONT_SUPPORT + select ARCH_USE_MEMREMAP_PROT + +config EFI_CUSTOM_SSDT_OVERLAYS + bool "Load custom ACPI SSDT overlay from an EFI variable" + depends on EFI && ACPI + default ACPI_TABLE_UPGRADE + help + Allow loading of an ACPI SSDT overlay from an EFI variable specified + by a kernel command line option. + + See Documentation/admin-guide/acpi/ssdt-overlays.rst for more + information. diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile new file mode 100644 index 000000000..d6ca2da19 --- /dev/null +++ b/drivers/firmware/efi/Makefile @@ -0,0 +1,44 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for linux kernel +# + +# +# ARM64 maps efi runtime services in userspace addresses +# which don't have KASAN shadow. So dereference of these addresses +# in efi_call_virt() will cause crash if this code instrumented. +# +KASAN_SANITIZE_runtime-wrappers.o := n + +obj-$(CONFIG_ACPI_BGRT) += efi-bgrt.o +obj-$(CONFIG_EFI) += efi.o vars.o reboot.o memattr.o tpm.o +obj-$(CONFIG_EFI) += capsule.o memmap.o +obj-$(CONFIG_EFI_PARAMS_FROM_FDT) += fdtparams.o +obj-$(CONFIG_EFI_VARS) += efivars.o +obj-$(CONFIG_EFI_ESRT) += esrt.o +obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o +obj-$(CONFIG_UEFI_CPER) += cper.o +obj-$(CONFIG_EFI_RUNTIME_MAP) += runtime-map.o +obj-$(CONFIG_EFI_RUNTIME_WRAPPERS) += runtime-wrappers.o +subdir-$(CONFIG_EFI_STUB) += libstub +obj-$(CONFIG_EFI_FAKE_MEMMAP) += fake_map.o +obj-$(CONFIG_EFI_BOOTLOADER_CONTROL) += efibc.o +obj-$(CONFIG_EFI_TEST) += test/ +obj-$(CONFIG_EFI_DEV_PATH_PARSER) += dev-path-parser.o +obj-$(CONFIG_APPLE_PROPERTIES) += apple-properties.o +obj-$(CONFIG_EFI_RCI2_TABLE) += rci2-table.o +obj-$(CONFIG_EFI_EMBEDDED_FIRMWARE) += embedded-firmware.o +obj-$(CONFIG_LOAD_UEFI_KEYS) += mokvar-table.o + +fake_map-y += fake_mem.o +fake_map-$(CONFIG_X86) += x86_fake_mem.o + +arm-obj-$(CONFIG_EFI) := efi-init.o arm-runtime.o +obj-$(CONFIG_ARM) += $(arm-obj-y) +obj-$(CONFIG_ARM64) += $(arm-obj-y) +riscv-obj-$(CONFIG_EFI) := efi-init.o riscv-runtime.o +obj-$(CONFIG_RISCV) += $(riscv-obj-y) +obj-$(CONFIG_EFI_CAPSULE_LOADER) += capsule-loader.o +obj-$(CONFIG_EFI_EARLYCON) += earlycon.o +obj-$(CONFIG_UEFI_CPER_ARM) += cper-arm.o +obj-$(CONFIG_UEFI_CPER_X86) += cper-x86.o diff --git a/drivers/firmware/efi/apple-properties.c b/drivers/firmware/efi/apple-properties.c new file mode 100644 index 000000000..e51838d74 --- /dev/null +++ b/drivers/firmware/efi/apple-properties.c @@ -0,0 +1,237 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * apple-properties.c - EFI device properties on Macs + * Copyright (C) 2016 Lukas Wunner <lukas@wunner.de> + * + * Properties are stored either as: + * u8 arrays which can be retrieved with device_property_read_u8_array() or + * booleans which can be queried with device_property_present(). + */ + +#define pr_fmt(fmt) "apple-properties: " fmt + +#include <linux/memblock.h> +#include <linux/efi.h> +#include <linux/io.h> +#include <linux/platform_data/x86/apple.h> +#include <linux/property.h> +#include <linux/slab.h> +#include <linux/ucs2_string.h> +#include <asm/setup.h> + +static bool dump_properties __initdata; + +static int __init dump_properties_enable(char *arg) +{ + dump_properties = true; + return 1; +} + +__setup("dump_apple_properties", dump_properties_enable); + +struct dev_header { + u32 len; + u32 prop_count; + struct efi_dev_path path[]; + /* + * followed by key/value pairs, each key and value preceded by u32 len, + * len includes itself, value may be empty (in which case its len is 4) + */ +}; + +struct properties_header { + u32 len; + u32 version; + u32 dev_count; + struct dev_header dev_header[]; +}; + +static void __init unmarshal_key_value_pairs(struct dev_header *dev_header, + struct device *dev, const void *ptr, + struct property_entry entry[]) +{ + int i; + + for (i = 0; i < dev_header->prop_count; i++) { + int remaining = dev_header->len - (ptr - (void *)dev_header); + u32 key_len, val_len, entry_len; + const u8 *entry_data; + char *key; + + if (sizeof(key_len) > remaining) + break; + + key_len = *(typeof(key_len) *)ptr; + if (key_len + sizeof(val_len) > remaining || + key_len < sizeof(key_len) + sizeof(efi_char16_t) || + *(efi_char16_t *)(ptr + sizeof(key_len)) == 0) { + dev_err(dev, "invalid property name len at %#zx\n", + ptr - (void *)dev_header); + break; + } + + val_len = *(typeof(val_len) *)(ptr + key_len); + if (key_len + val_len > remaining || + val_len < sizeof(val_len)) { + dev_err(dev, "invalid property val len at %#zx\n", + ptr - (void *)dev_header + key_len); + break; + } + + /* 4 bytes to accommodate UTF-8 code points + null byte */ + key = kzalloc((key_len - sizeof(key_len)) * 4 + 1, GFP_KERNEL); + if (!key) { + dev_err(dev, "cannot allocate property name\n"); + break; + } + ucs2_as_utf8(key, ptr + sizeof(key_len), + key_len - sizeof(key_len)); + + entry_data = ptr + key_len + sizeof(val_len); + entry_len = val_len - sizeof(val_len); + if (entry_len) + entry[i] = PROPERTY_ENTRY_U8_ARRAY_LEN(key, entry_data, + entry_len); + else + entry[i] = PROPERTY_ENTRY_BOOL(key); + + if (dump_properties) { + dev_info(dev, "property: %s\n", key); + print_hex_dump(KERN_INFO, pr_fmt(), DUMP_PREFIX_OFFSET, + 16, 1, entry_data, entry_len, true); + } + + ptr += key_len + val_len; + } + + if (i != dev_header->prop_count) { + dev_err(dev, "got %d device properties, expected %u\n", i, + dev_header->prop_count); + print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET, + 16, 1, dev_header, dev_header->len, true); + return; + } + + dev_info(dev, "assigning %d device properties\n", i); +} + +static int __init unmarshal_devices(struct properties_header *properties) +{ + size_t offset = offsetof(struct properties_header, dev_header[0]); + + while (offset + sizeof(struct dev_header) < properties->len) { + struct dev_header *dev_header = (void *)properties + offset; + struct property_entry *entry = NULL; + const struct efi_dev_path *ptr; + struct device *dev; + size_t len; + int ret, i; + + if (offset + dev_header->len > properties->len || + dev_header->len <= sizeof(*dev_header)) { + pr_err("invalid len in dev_header at %#zx\n", offset); + return -EINVAL; + } + + ptr = dev_header->path; + len = dev_header->len - sizeof(*dev_header); + + dev = efi_get_device_by_path(&ptr, &len); + if (IS_ERR(dev)) { + pr_err("device path parse error %ld at %#zx:\n", + PTR_ERR(dev), (void *)ptr - (void *)dev_header); + print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET, + 16, 1, dev_header, dev_header->len, true); + dev = NULL; + goto skip_device; + } + + entry = kcalloc(dev_header->prop_count + 1, sizeof(*entry), + GFP_KERNEL); + if (!entry) { + dev_err(dev, "cannot allocate properties\n"); + goto skip_device; + } + + unmarshal_key_value_pairs(dev_header, dev, ptr, entry); + if (!entry[0].name) + goto skip_device; + + ret = device_add_properties(dev, entry); /* makes deep copy */ + if (ret) + dev_err(dev, "error %d assigning properties\n", ret); + + for (i = 0; entry[i].name; i++) + kfree(entry[i].name); + +skip_device: + kfree(entry); + put_device(dev); + offset += dev_header->len; + } + + return 0; +} + +static int __init map_properties(void) +{ + struct properties_header *properties; + struct setup_data *data; + u32 data_len; + u64 pa_data; + int ret; + + if (!x86_apple_machine) + return 0; + + pa_data = boot_params.hdr.setup_data; + while (pa_data) { + data = memremap(pa_data, sizeof(*data), MEMREMAP_WB); + if (!data) { + pr_err("cannot map setup_data header\n"); + return -ENOMEM; + } + + if (data->type != SETUP_APPLE_PROPERTIES) { + pa_data = data->next; + memunmap(data); + continue; + } + + data_len = data->len; + memunmap(data); + + data = memremap(pa_data, sizeof(*data) + data_len, MEMREMAP_WB); + if (!data) { + pr_err("cannot map setup_data payload\n"); + return -ENOMEM; + } + + properties = (struct properties_header *)data->data; + if (properties->version != 1) { + pr_err("unsupported version:\n"); + print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET, + 16, 1, properties, data_len, true); + ret = -ENOTSUPP; + } else if (properties->len != data_len) { + pr_err("length mismatch, expected %u\n", data_len); + print_hex_dump(KERN_ERR, pr_fmt(), DUMP_PREFIX_OFFSET, + 16, 1, properties, data_len, true); + ret = -EINVAL; + } else + ret = unmarshal_devices(properties); + + /* + * Can only free the setup_data payload but not its header + * to avoid breaking the chain of ->next pointers. + */ + data->len = 0; + memunmap(data); + memblock_free_late(pa_data + sizeof(*data), data_len); + + return ret; + } + return 0; +} + +fs_initcall(map_properties); diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c new file mode 100644 index 000000000..3359ae2ad --- /dev/null +++ b/drivers/firmware/efi/arm-runtime.c @@ -0,0 +1,178 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Extensible Firmware Interface + * + * Based on Extensible Firmware Interface Specification version 2.4 + * + * Copyright (C) 2013, 2014 Linaro Ltd. + */ + +#include <linux/dmi.h> +#include <linux/efi.h> +#include <linux/io.h> +#include <linux/memblock.h> +#include <linux/mm_types.h> +#include <linux/preempt.h> +#include <linux/rbtree.h> +#include <linux/rwsem.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/pgtable.h> + +#include <asm/cacheflush.h> +#include <asm/efi.h> +#include <asm/mmu.h> +#include <asm/pgalloc.h> + +#if defined(CONFIG_PTDUMP_DEBUGFS) && defined(CONFIG_ARM64) +#include <asm/ptdump.h> + +static struct ptdump_info efi_ptdump_info = { + .mm = &efi_mm, + .markers = (struct addr_marker[]){ + { 0, "UEFI runtime start" }, + { DEFAULT_MAP_WINDOW_64, "UEFI runtime end" }, + { -1, NULL } + }, + .base_addr = 0, +}; + +static int __init ptdump_init(void) +{ + if (efi_enabled(EFI_RUNTIME_SERVICES)) + ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables"); + + return 0; +} +device_initcall(ptdump_init); + +#endif + +static bool __init efi_virtmap_init(void) +{ + efi_memory_desc_t *md; + + efi_mm.pgd = pgd_alloc(&efi_mm); + mm_init_cpumask(&efi_mm); + init_new_context(NULL, &efi_mm); + + for_each_efi_memory_desc(md) { + phys_addr_t phys = md->phys_addr; + int ret; + + if (!(md->attribute & EFI_MEMORY_RUNTIME)) + continue; + if (md->virt_addr == 0) + return false; + + ret = efi_create_mapping(&efi_mm, md); + if (ret) { + pr_warn(" EFI remap %pa: failed to create mapping (%d)\n", + &phys, ret); + return false; + } + } + + if (efi_memattr_apply_permissions(&efi_mm, efi_set_mapping_permissions)) + return false; + + return true; +} + +/* + * Enable the UEFI Runtime Services if all prerequisites are in place, i.e., + * non-early mapping of the UEFI system table and virtual mappings for all + * EFI_MEMORY_RUNTIME regions. + */ +static int __init arm_enable_runtime_services(void) +{ + u64 mapsize; + + if (!efi_enabled(EFI_BOOT)) { + pr_info("EFI services will not be available.\n"); + return 0; + } + + efi_memmap_unmap(); + + mapsize = efi.memmap.desc_size * efi.memmap.nr_map; + + if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) { + pr_err("Failed to remap EFI memory map\n"); + return 0; + } + + if (efi_soft_reserve_enabled()) { + efi_memory_desc_t *md; + + for_each_efi_memory_desc(md) { + int md_size = md->num_pages << EFI_PAGE_SHIFT; + struct resource *res; + + if (!(md->attribute & EFI_MEMORY_SP)) + continue; + + res = kzalloc(sizeof(*res), GFP_KERNEL); + if (WARN_ON(!res)) + break; + + res->start = md->phys_addr; + res->end = md->phys_addr + md_size - 1; + res->name = "Soft Reserved"; + res->flags = IORESOURCE_MEM; + res->desc = IORES_DESC_SOFT_RESERVED; + + insert_resource(&iomem_resource, res); + } + } + + if (efi_runtime_disabled()) { + pr_info("EFI runtime services will be disabled.\n"); + return 0; + } + + if (efi_enabled(EFI_RUNTIME_SERVICES)) { + pr_info("EFI runtime services access via paravirt.\n"); + return 0; + } + + pr_info("Remapping and enabling EFI services.\n"); + + if (!efi_virtmap_init()) { + pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n"); + return -ENOMEM; + } + + /* Set up runtime services function pointers */ + efi_native_runtime_setup(); + set_bit(EFI_RUNTIME_SERVICES, &efi.flags); + + return 0; +} +early_initcall(arm_enable_runtime_services); + +void efi_virtmap_load(void) +{ + preempt_disable(); + efi_set_pgd(&efi_mm); +} + +void efi_virtmap_unload(void) +{ + efi_set_pgd(current->active_mm); + preempt_enable(); +} + + +static int __init arm_dmi_init(void) +{ + /* + * On arm64/ARM, DMI depends on UEFI, and dmi_setup() needs to + * be called early because dmi_id_init(), which is an arch_initcall + * itself, depends on dmi_scan_machine() having been called already. + */ + dmi_setup(); + return 0; +} +core_initcall(arm_dmi_init); diff --git a/drivers/firmware/efi/capsule-loader.c b/drivers/firmware/efi/capsule-loader.c new file mode 100644 index 000000000..3e8d4b51a --- /dev/null +++ b/drivers/firmware/efi/capsule-loader.c @@ -0,0 +1,343 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * EFI capsule loader driver. + * + * Copyright 2015 Intel Corporation + */ + +#define pr_fmt(fmt) "efi: " fmt + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/miscdevice.h> +#include <linux/highmem.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/mutex.h> +#include <linux/efi.h> +#include <linux/vmalloc.h> + +#define NO_FURTHER_WRITE_ACTION -1 + +/** + * efi_free_all_buff_pages - free all previous allocated buffer pages + * @cap_info: pointer to current instance of capsule_info structure + * + * In addition to freeing buffer pages, it flags NO_FURTHER_WRITE_ACTION + * to cease processing data in subsequent write(2) calls until close(2) + * is called. + **/ +static void efi_free_all_buff_pages(struct capsule_info *cap_info) +{ + while (cap_info->index > 0) + __free_page(cap_info->pages[--cap_info->index]); + + cap_info->index = NO_FURTHER_WRITE_ACTION; +} + +int __efi_capsule_setup_info(struct capsule_info *cap_info) +{ + size_t pages_needed; + int ret; + void *temp_page; + + pages_needed = ALIGN(cap_info->total_size, PAGE_SIZE) / PAGE_SIZE; + + if (pages_needed == 0) { + pr_err("invalid capsule size\n"); + return -EINVAL; + } + + /* Check if the capsule binary supported */ + ret = efi_capsule_supported(cap_info->header.guid, + cap_info->header.flags, + cap_info->header.imagesize, + &cap_info->reset_type); + if (ret) { + pr_err("capsule not supported\n"); + return ret; + } + + temp_page = krealloc(cap_info->pages, + pages_needed * sizeof(void *), + GFP_KERNEL | __GFP_ZERO); + if (!temp_page) + return -ENOMEM; + + cap_info->pages = temp_page; + + temp_page = krealloc(cap_info->phys, + pages_needed * sizeof(phys_addr_t *), + GFP_KERNEL | __GFP_ZERO); + if (!temp_page) + return -ENOMEM; + + cap_info->phys = temp_page; + + return 0; +} + +/** + * efi_capsule_setup_info - obtain the efi capsule header in the binary and + * setup capsule_info structure + * @cap_info: pointer to current instance of capsule_info structure + * @kbuff: a mapped first page buffer pointer + * @hdr_bytes: the total received number of bytes for efi header + * + * Platforms with non-standard capsule update mechanisms can override + * this __weak function so they can perform any required capsule + * image munging. See quark_quirk_function() for an example. + **/ +int __weak efi_capsule_setup_info(struct capsule_info *cap_info, void *kbuff, + size_t hdr_bytes) +{ + /* Only process data block that is larger than efi header size */ + if (hdr_bytes < sizeof(efi_capsule_header_t)) + return 0; + + memcpy(&cap_info->header, kbuff, sizeof(cap_info->header)); + cap_info->total_size = cap_info->header.imagesize; + + return __efi_capsule_setup_info(cap_info); +} + +/** + * efi_capsule_submit_update - invoke the efi_capsule_update API once binary + * upload done + * @cap_info: pointer to current instance of capsule_info structure + **/ +static ssize_t efi_capsule_submit_update(struct capsule_info *cap_info) +{ + bool do_vunmap = false; + int ret; + + /* + * cap_info->capsule may have been assigned already by a quirk + * handler, so only overwrite it if it is NULL + */ + if (!cap_info->capsule) { + cap_info->capsule = vmap(cap_info->pages, cap_info->index, + VM_MAP, PAGE_KERNEL); + if (!cap_info->capsule) + return -ENOMEM; + do_vunmap = true; + } + + ret = efi_capsule_update(cap_info->capsule, cap_info->phys); + if (do_vunmap) + vunmap(cap_info->capsule); + if (ret) { + pr_err("capsule update failed\n"); + return ret; + } + + /* Indicate capsule binary uploading is done */ + cap_info->index = NO_FURTHER_WRITE_ACTION; + + if (cap_info->header.flags & EFI_CAPSULE_PERSIST_ACROSS_RESET) { + pr_info("Successfully uploaded capsule file with reboot type '%s'\n", + !cap_info->reset_type ? "RESET_COLD" : + cap_info->reset_type == 1 ? "RESET_WARM" : + "RESET_SHUTDOWN"); + } else { + pr_info("Successfully processed capsule file\n"); + } + + return 0; +} + +/** + * efi_capsule_write - store the capsule binary and pass it to + * efi_capsule_update() API + * @file: file pointer + * @buff: buffer pointer + * @count: number of bytes in @buff + * @offp: not used + * + * Expectation: + * - A user space tool should start at the beginning of capsule binary and + * pass data in sequentially. + * - Users should close and re-open this file note in order to upload more + * capsules. + * - After an error returned, user should close the file and restart the + * operation for the next try otherwise -EIO will be returned until the + * file is closed. + * - An EFI capsule header must be located at the beginning of capsule + * binary file and passed in as first block data of write operation. + **/ +static ssize_t efi_capsule_write(struct file *file, const char __user *buff, + size_t count, loff_t *offp) +{ + int ret; + struct capsule_info *cap_info = file->private_data; + struct page *page; + void *kbuff = NULL; + size_t write_byte; + + if (count == 0) + return 0; + + /* Return error while NO_FURTHER_WRITE_ACTION is flagged */ + if (cap_info->index < 0) + return -EIO; + + /* Only alloc a new page when previous page is full */ + if (!cap_info->page_bytes_remain) { + page = alloc_page(GFP_KERNEL); + if (!page) { + ret = -ENOMEM; + goto failed; + } + + cap_info->pages[cap_info->index] = page; + cap_info->phys[cap_info->index] = page_to_phys(page); + cap_info->page_bytes_remain = PAGE_SIZE; + cap_info->index++; + } else { + page = cap_info->pages[cap_info->index - 1]; + } + + kbuff = kmap(page); + kbuff += PAGE_SIZE - cap_info->page_bytes_remain; + + /* Copy capsule binary data from user space to kernel space buffer */ + write_byte = min_t(size_t, count, cap_info->page_bytes_remain); + if (copy_from_user(kbuff, buff, write_byte)) { + ret = -EFAULT; + goto fail_unmap; + } + cap_info->page_bytes_remain -= write_byte; + + /* Setup capsule binary info structure */ + if (cap_info->header.headersize == 0) { + ret = efi_capsule_setup_info(cap_info, kbuff - cap_info->count, + cap_info->count + write_byte); + if (ret) + goto fail_unmap; + } + + cap_info->count += write_byte; + kunmap(page); + + /* Submit the full binary to efi_capsule_update() API */ + if (cap_info->header.headersize > 0 && + cap_info->count >= cap_info->total_size) { + if (cap_info->count > cap_info->total_size) { + pr_err("capsule upload size exceeded header defined size\n"); + ret = -EINVAL; + goto failed; + } + + ret = efi_capsule_submit_update(cap_info); + if (ret) + goto failed; + } + + return write_byte; + +fail_unmap: + kunmap(page); +failed: + efi_free_all_buff_pages(cap_info); + return ret; +} + +/** + * efi_capsule_release - called by file close + * @inode: not used + * @file: file pointer + * + * We will not free successfully submitted pages since efi update + * requires data to be maintained across system reboot. + **/ +static int efi_capsule_release(struct inode *inode, struct file *file) +{ + struct capsule_info *cap_info = file->private_data; + + if (cap_info->index > 0 && + (cap_info->header.headersize == 0 || + cap_info->count < cap_info->total_size)) { + pr_err("capsule upload not complete\n"); + efi_free_all_buff_pages(cap_info); + } + + kfree(cap_info->pages); + kfree(cap_info->phys); + kfree(file->private_data); + file->private_data = NULL; + return 0; +} + +/** + * efi_capsule_open - called by file open + * @inode: not used + * @file: file pointer + * + * Will allocate each capsule_info memory for each file open call. + * This provided the capability to support multiple file open feature + * where user is not needed to wait for others to finish in order to + * upload their capsule binary. + **/ +static int efi_capsule_open(struct inode *inode, struct file *file) +{ + struct capsule_info *cap_info; + + cap_info = kzalloc(sizeof(*cap_info), GFP_KERNEL); + if (!cap_info) + return -ENOMEM; + + cap_info->pages = kzalloc(sizeof(void *), GFP_KERNEL); + if (!cap_info->pages) { + kfree(cap_info); + return -ENOMEM; + } + + cap_info->phys = kzalloc(sizeof(void *), GFP_KERNEL); + if (!cap_info->phys) { + kfree(cap_info->pages); + kfree(cap_info); + return -ENOMEM; + } + + file->private_data = cap_info; + + return 0; +} + +static const struct file_operations efi_capsule_fops = { + .owner = THIS_MODULE, + .open = efi_capsule_open, + .write = efi_capsule_write, + .release = efi_capsule_release, + .llseek = no_llseek, +}; + +static struct miscdevice efi_capsule_misc = { + .minor = MISC_DYNAMIC_MINOR, + .name = "efi_capsule_loader", + .fops = &efi_capsule_fops, +}; + +static int __init efi_capsule_loader_init(void) +{ + int ret; + + if (!efi_enabled(EFI_RUNTIME_SERVICES)) + return -ENODEV; + + ret = misc_register(&efi_capsule_misc); + if (ret) + pr_err("Unable to register capsule loader device\n"); + + return ret; +} +module_init(efi_capsule_loader_init); + +static void __exit efi_capsule_loader_exit(void) +{ + misc_deregister(&efi_capsule_misc); +} +module_exit(efi_capsule_loader_exit); + +MODULE_DESCRIPTION("EFI capsule firmware binary loader"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/firmware/efi/capsule.c b/drivers/firmware/efi/capsule.c new file mode 100644 index 000000000..598b7800d --- /dev/null +++ b/drivers/firmware/efi/capsule.c @@ -0,0 +1,303 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * EFI capsule support. + * + * Copyright 2013 Intel Corporation; author Matt Fleming + */ + +#define pr_fmt(fmt) "efi: " fmt + +#include <linux/slab.h> +#include <linux/mutex.h> +#include <linux/highmem.h> +#include <linux/efi.h> +#include <linux/vmalloc.h> +#include <asm/io.h> + +typedef struct { + u64 length; + u64 data; +} efi_capsule_block_desc_t; + +static bool capsule_pending; +static bool stop_capsules; +static int efi_reset_type = -1; + +/* + * capsule_mutex serialises access to both capsule_pending and + * efi_reset_type and stop_capsules. + */ +static DEFINE_MUTEX(capsule_mutex); + +/** + * efi_capsule_pending - has a capsule been passed to the firmware? + * @reset_type: store the type of EFI reset if capsule is pending + * + * To ensure that the registered capsule is processed correctly by the + * firmware we need to perform a specific type of reset. If a capsule is + * pending return the reset type in @reset_type. + * + * This function will race with callers of efi_capsule_update(), for + * example, calling this function while somebody else is in + * efi_capsule_update() but hasn't reached efi_capsue_update_locked() + * will miss the updates to capsule_pending and efi_reset_type after + * efi_capsule_update_locked() completes. + * + * A non-racy use is from platform reboot code because we use + * system_state to ensure no capsules can be sent to the firmware once + * we're at SYSTEM_RESTART. See efi_capsule_update_locked(). + */ +bool efi_capsule_pending(int *reset_type) +{ + if (!capsule_pending) + return false; + + if (reset_type) + *reset_type = efi_reset_type; + + return true; +} + +/* + * Whitelist of EFI capsule flags that we support. + * + * We do not handle EFI_CAPSULE_INITIATE_RESET because that would + * require us to prepare the kernel for reboot. Refuse to load any + * capsules with that flag and any other flags that we do not know how + * to handle. + */ +#define EFI_CAPSULE_SUPPORTED_FLAG_MASK \ + (EFI_CAPSULE_PERSIST_ACROSS_RESET | EFI_CAPSULE_POPULATE_SYSTEM_TABLE) + +/** + * efi_capsule_supported - does the firmware support the capsule? + * @guid: vendor guid of capsule + * @flags: capsule flags + * @size: size of capsule data + * @reset: the reset type required for this capsule + * + * Check whether a capsule with @flags is supported by the firmware + * and that @size doesn't exceed the maximum size for a capsule. + * + * No attempt is made to check @reset against the reset type required + * by any pending capsules because of the races involved. + */ +int efi_capsule_supported(efi_guid_t guid, u32 flags, size_t size, int *reset) +{ + efi_capsule_header_t capsule; + efi_capsule_header_t *cap_list[] = { &capsule }; + efi_status_t status; + u64 max_size; + + if (flags & ~EFI_CAPSULE_SUPPORTED_FLAG_MASK) + return -EINVAL; + + capsule.headersize = capsule.imagesize = sizeof(capsule); + memcpy(&capsule.guid, &guid, sizeof(efi_guid_t)); + capsule.flags = flags; + + status = efi.query_capsule_caps(cap_list, 1, &max_size, reset); + if (status != EFI_SUCCESS) + return efi_status_to_err(status); + + if (size > max_size) + return -ENOSPC; + + return 0; +} +EXPORT_SYMBOL_GPL(efi_capsule_supported); + +/* + * Every scatter gather list (block descriptor) page must end with a + * continuation pointer. The last continuation pointer of the last + * page must be zero to mark the end of the chain. + */ +#define SGLIST_PER_PAGE ((PAGE_SIZE / sizeof(efi_capsule_block_desc_t)) - 1) + +/* + * How many scatter gather list (block descriptor) pages do we need + * to map @count pages? + */ +static inline unsigned int sg_pages_num(unsigned int count) +{ + return DIV_ROUND_UP(count, SGLIST_PER_PAGE); +} + +/** + * efi_capsule_update_locked - pass a single capsule to the firmware + * @capsule: capsule to send to the firmware + * @sg_pages: array of scatter gather (block descriptor) pages + * @reset: the reset type required for @capsule + * + * Since this function must be called under capsule_mutex check + * whether efi_reset_type will conflict with @reset, and atomically + * set it and capsule_pending if a capsule was successfully sent to + * the firmware. + * + * We also check to see if the system is about to restart, and if so, + * abort. This avoids races between efi_capsule_update() and + * efi_capsule_pending(). + */ +static int +efi_capsule_update_locked(efi_capsule_header_t *capsule, + struct page **sg_pages, int reset) +{ + efi_physical_addr_t sglist_phys; + efi_status_t status; + + lockdep_assert_held(&capsule_mutex); + + /* + * If someone has already registered a capsule that requires a + * different reset type, we're out of luck and must abort. + */ + if (efi_reset_type >= 0 && efi_reset_type != reset) { + pr_err("Conflicting capsule reset type %d (%d).\n", + reset, efi_reset_type); + return -EINVAL; + } + + /* + * If the system is getting ready to restart it may have + * called efi_capsule_pending() to make decisions (such as + * whether to force an EFI reboot), and we're racing against + * that call. Abort in that case. + */ + if (unlikely(stop_capsules)) { + pr_warn("Capsule update raced with reboot, aborting.\n"); + return -EINVAL; + } + + sglist_phys = page_to_phys(sg_pages[0]); + + status = efi.update_capsule(&capsule, 1, sglist_phys); + if (status == EFI_SUCCESS) { + capsule_pending = true; + efi_reset_type = reset; + } + + return efi_status_to_err(status); +} + +/** + * efi_capsule_update - send a capsule to the firmware + * @capsule: capsule to send to firmware + * @pages: an array of capsule data pages + * + * Build a scatter gather list with EFI capsule block descriptors to + * map the capsule described by @capsule with its data in @pages and + * send it to the firmware via the UpdateCapsule() runtime service. + * + * @capsule must be a virtual mapping of the complete capsule update in the + * kernel address space, as the capsule can be consumed immediately. + * A capsule_header_t that describes the entire contents of the capsule + * must be at the start of the first data page. + * + * Even though this function will validate that the firmware supports + * the capsule guid, users will likely want to check that + * efi_capsule_supported() returns true before calling this function + * because it makes it easier to print helpful error messages. + * + * If the capsule is successfully submitted to the firmware, any + * subsequent calls to efi_capsule_pending() will return true. @pages + * must not be released or modified if this function returns + * successfully. + * + * Callers must be prepared for this function to fail, which can + * happen if we raced with system reboot or if there is already a + * pending capsule that has a reset type that conflicts with the one + * required by @capsule. Do NOT use efi_capsule_pending() to detect + * this conflict since that would be racy. Instead, submit the capsule + * to efi_capsule_update() and check the return value. + * + * Return 0 on success, a converted EFI status code on failure. + */ +int efi_capsule_update(efi_capsule_header_t *capsule, phys_addr_t *pages) +{ + u32 imagesize = capsule->imagesize; + efi_guid_t guid = capsule->guid; + unsigned int count, sg_count; + u32 flags = capsule->flags; + struct page **sg_pages; + int rv, reset_type; + int i, j; + + rv = efi_capsule_supported(guid, flags, imagesize, &reset_type); + if (rv) + return rv; + + count = DIV_ROUND_UP(imagesize, PAGE_SIZE); + sg_count = sg_pages_num(count); + + sg_pages = kcalloc(sg_count, sizeof(*sg_pages), GFP_KERNEL); + if (!sg_pages) + return -ENOMEM; + + for (i = 0; i < sg_count; i++) { + sg_pages[i] = alloc_page(GFP_KERNEL); + if (!sg_pages[i]) { + rv = -ENOMEM; + goto out; + } + } + + for (i = 0; i < sg_count; i++) { + efi_capsule_block_desc_t *sglist; + + sglist = kmap(sg_pages[i]); + + for (j = 0; j < SGLIST_PER_PAGE && count > 0; j++) { + u64 sz = min_t(u64, imagesize, + PAGE_SIZE - (u64)*pages % PAGE_SIZE); + + sglist[j].length = sz; + sglist[j].data = *pages++; + + imagesize -= sz; + count--; + } + + /* Continuation pointer */ + sglist[j].length = 0; + + if (i + 1 == sg_count) + sglist[j].data = 0; + else + sglist[j].data = page_to_phys(sg_pages[i + 1]); + + kunmap(sg_pages[i]); + } + + mutex_lock(&capsule_mutex); + rv = efi_capsule_update_locked(capsule, sg_pages, reset_type); + mutex_unlock(&capsule_mutex); + +out: + for (i = 0; rv && i < sg_count; i++) { + if (sg_pages[i]) + __free_page(sg_pages[i]); + } + + kfree(sg_pages); + return rv; +} +EXPORT_SYMBOL_GPL(efi_capsule_update); + +static int capsule_reboot_notify(struct notifier_block *nb, unsigned long event, void *cmd) +{ + mutex_lock(&capsule_mutex); + stop_capsules = true; + mutex_unlock(&capsule_mutex); + + return NOTIFY_DONE; +} + +static struct notifier_block capsule_reboot_nb = { + .notifier_call = capsule_reboot_notify, +}; + +static int __init capsule_reboot_register(void) +{ + return register_reboot_notifier(&capsule_reboot_nb); +} +core_initcall(capsule_reboot_register); diff --git a/drivers/firmware/efi/cper-arm.c b/drivers/firmware/efi/cper-arm.c new file mode 100644 index 000000000..36d3b8b9d --- /dev/null +++ b/drivers/firmware/efi/cper-arm.c @@ -0,0 +1,342 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * UEFI Common Platform Error Record (CPER) support + * + * Copyright (C) 2017, The Linux Foundation. All rights reserved. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/time.h> +#include <linux/cper.h> +#include <linux/dmi.h> +#include <linux/acpi.h> +#include <linux/pci.h> +#include <linux/aer.h> +#include <linux/printk.h> +#include <linux/bcd.h> +#include <acpi/ghes.h> +#include <ras/ras_event.h> + +static const char * const arm_reg_ctx_strs[] = { + "AArch32 general purpose registers", + "AArch32 EL1 context registers", + "AArch32 EL2 context registers", + "AArch32 secure context registers", + "AArch64 general purpose registers", + "AArch64 EL1 context registers", + "AArch64 EL2 context registers", + "AArch64 EL3 context registers", + "Misc. system register structure", +}; + +static const char * const arm_err_trans_type_strs[] = { + "Instruction", + "Data Access", + "Generic", +}; + +static const char * const arm_bus_err_op_strs[] = { + "Generic error (type cannot be determined)", + "Generic read (type of instruction or data request cannot be determined)", + "Generic write (type of instruction of data request cannot be determined)", + "Data read", + "Data write", + "Instruction fetch", + "Prefetch", +}; + +static const char * const arm_cache_err_op_strs[] = { + "Generic error (type cannot be determined)", + "Generic read (type of instruction or data request cannot be determined)", + "Generic write (type of instruction of data request cannot be determined)", + "Data read", + "Data write", + "Instruction fetch", + "Prefetch", + "Eviction", + "Snooping (processor initiated a cache snoop that resulted in an error)", + "Snooped (processor raised a cache error caused by another processor or device snooping its cache)", + "Management", +}; + +static const char * const arm_tlb_err_op_strs[] = { + "Generic error (type cannot be determined)", + "Generic read (type of instruction or data request cannot be determined)", + "Generic write (type of instruction of data request cannot be determined)", + "Data read", + "Data write", + "Instruction fetch", + "Prefetch", + "Local management operation (processor initiated a TLB management operation that resulted in an error)", + "External management operation (processor raised a TLB error caused by another processor or device broadcasting TLB operations)", +}; + +static const char * const arm_bus_err_part_type_strs[] = { + "Local processor originated request", + "Local processor responded to request", + "Local processor observed", + "Generic", +}; + +static const char * const arm_bus_err_addr_space_strs[] = { + "External Memory Access", + "Internal Memory Access", + "Unknown", + "Device Memory Access", +}; + +static void cper_print_arm_err_info(const char *pfx, u32 type, + u64 error_info) +{ + u8 trans_type, op_type, level, participation_type, address_space; + u16 mem_attributes; + bool proc_context_corrupt, corrected, precise_pc, restartable_pc; + bool time_out, access_mode; + + /* If the type is unknown, bail. */ + if (type > CPER_ARM_MAX_TYPE) + return; + + /* + * Vendor type errors have error information values that are vendor + * specific. + */ + if (type == CPER_ARM_VENDOR_ERROR) + return; + + if (error_info & CPER_ARM_ERR_VALID_TRANSACTION_TYPE) { + trans_type = ((error_info >> CPER_ARM_ERR_TRANSACTION_SHIFT) + & CPER_ARM_ERR_TRANSACTION_MASK); + if (trans_type < ARRAY_SIZE(arm_err_trans_type_strs)) { + printk("%stransaction type: %s\n", pfx, + arm_err_trans_type_strs[trans_type]); + } + } + + if (error_info & CPER_ARM_ERR_VALID_OPERATION_TYPE) { + op_type = ((error_info >> CPER_ARM_ERR_OPERATION_SHIFT) + & CPER_ARM_ERR_OPERATION_MASK); + switch (type) { + case CPER_ARM_CACHE_ERROR: + if (op_type < ARRAY_SIZE(arm_cache_err_op_strs)) { + printk("%soperation type: %s\n", pfx, + arm_cache_err_op_strs[op_type]); + } + break; + case CPER_ARM_TLB_ERROR: + if (op_type < ARRAY_SIZE(arm_tlb_err_op_strs)) { + printk("%soperation type: %s\n", pfx, + arm_tlb_err_op_strs[op_type]); + } + break; + case CPER_ARM_BUS_ERROR: + if (op_type < ARRAY_SIZE(arm_bus_err_op_strs)) { + printk("%soperation type: %s\n", pfx, + arm_bus_err_op_strs[op_type]); + } + break; + } + } + + if (error_info & CPER_ARM_ERR_VALID_LEVEL) { + level = ((error_info >> CPER_ARM_ERR_LEVEL_SHIFT) + & CPER_ARM_ERR_LEVEL_MASK); + switch (type) { + case CPER_ARM_CACHE_ERROR: + printk("%scache level: %d\n", pfx, level); + break; + case CPER_ARM_TLB_ERROR: + printk("%sTLB level: %d\n", pfx, level); + break; + case CPER_ARM_BUS_ERROR: + printk("%saffinity level at which the bus error occurred: %d\n", + pfx, level); + break; + } + } + + if (error_info & CPER_ARM_ERR_VALID_PROC_CONTEXT_CORRUPT) { + proc_context_corrupt = ((error_info >> CPER_ARM_ERR_PC_CORRUPT_SHIFT) + & CPER_ARM_ERR_PC_CORRUPT_MASK); + if (proc_context_corrupt) + printk("%sprocessor context corrupted\n", pfx); + else + printk("%sprocessor context not corrupted\n", pfx); + } + + if (error_info & CPER_ARM_ERR_VALID_CORRECTED) { + corrected = ((error_info >> CPER_ARM_ERR_CORRECTED_SHIFT) + & CPER_ARM_ERR_CORRECTED_MASK); + if (corrected) + printk("%sthe error has been corrected\n", pfx); + else + printk("%sthe error has not been corrected\n", pfx); + } + + if (error_info & CPER_ARM_ERR_VALID_PRECISE_PC) { + precise_pc = ((error_info >> CPER_ARM_ERR_PRECISE_PC_SHIFT) + & CPER_ARM_ERR_PRECISE_PC_MASK); + if (precise_pc) + printk("%sPC is precise\n", pfx); + else + printk("%sPC is imprecise\n", pfx); + } + + if (error_info & CPER_ARM_ERR_VALID_RESTARTABLE_PC) { + restartable_pc = ((error_info >> CPER_ARM_ERR_RESTARTABLE_PC_SHIFT) + & CPER_ARM_ERR_RESTARTABLE_PC_MASK); + if (restartable_pc) + printk("%sProgram execution can be restarted reliably at the PC associated with the error.\n", pfx); + } + + /* The rest of the fields are specific to bus errors */ + if (type != CPER_ARM_BUS_ERROR) + return; + + if (error_info & CPER_ARM_ERR_VALID_PARTICIPATION_TYPE) { + participation_type = ((error_info >> CPER_ARM_ERR_PARTICIPATION_TYPE_SHIFT) + & CPER_ARM_ERR_PARTICIPATION_TYPE_MASK); + if (participation_type < ARRAY_SIZE(arm_bus_err_part_type_strs)) { + printk("%sparticipation type: %s\n", pfx, + arm_bus_err_part_type_strs[participation_type]); + } + } + + if (error_info & CPER_ARM_ERR_VALID_TIME_OUT) { + time_out = ((error_info >> CPER_ARM_ERR_TIME_OUT_SHIFT) + & CPER_ARM_ERR_TIME_OUT_MASK); + if (time_out) + printk("%srequest timed out\n", pfx); + } + + if (error_info & CPER_ARM_ERR_VALID_ADDRESS_SPACE) { + address_space = ((error_info >> CPER_ARM_ERR_ADDRESS_SPACE_SHIFT) + & CPER_ARM_ERR_ADDRESS_SPACE_MASK); + if (address_space < ARRAY_SIZE(arm_bus_err_addr_space_strs)) { + printk("%saddress space: %s\n", pfx, + arm_bus_err_addr_space_strs[address_space]); + } + } + + if (error_info & CPER_ARM_ERR_VALID_MEM_ATTRIBUTES) { + mem_attributes = ((error_info >> CPER_ARM_ERR_MEM_ATTRIBUTES_SHIFT) + & CPER_ARM_ERR_MEM_ATTRIBUTES_MASK); + printk("%smemory access attributes:0x%x\n", pfx, mem_attributes); + } + + if (error_info & CPER_ARM_ERR_VALID_ACCESS_MODE) { + access_mode = ((error_info >> CPER_ARM_ERR_ACCESS_MODE_SHIFT) + & CPER_ARM_ERR_ACCESS_MODE_MASK); + if (access_mode) + printk("%saccess mode: normal\n", pfx); + else + printk("%saccess mode: secure\n", pfx); + } +} + +void cper_print_proc_arm(const char *pfx, + const struct cper_sec_proc_arm *proc) +{ + int i, len, max_ctx_type; + struct cper_arm_err_info *err_info; + struct cper_arm_ctx_info *ctx_info; + char newpfx[64], infopfx[64]; + + printk("%sMIDR: 0x%016llx\n", pfx, proc->midr); + + len = proc->section_length - (sizeof(*proc) + + proc->err_info_num * (sizeof(*err_info))); + if (len < 0) { + printk("%ssection length: %d\n", pfx, proc->section_length); + printk("%ssection length is too small\n", pfx); + printk("%sfirmware-generated error record is incorrect\n", pfx); + printk("%sERR_INFO_NUM is %d\n", pfx, proc->err_info_num); + return; + } + + if (proc->validation_bits & CPER_ARM_VALID_MPIDR) + printk("%sMultiprocessor Affinity Register (MPIDR): 0x%016llx\n", + pfx, proc->mpidr); + + if (proc->validation_bits & CPER_ARM_VALID_AFFINITY_LEVEL) + printk("%serror affinity level: %d\n", pfx, + proc->affinity_level); + + if (proc->validation_bits & CPER_ARM_VALID_RUNNING_STATE) { + printk("%srunning state: 0x%x\n", pfx, proc->running_state); + printk("%sPower State Coordination Interface state: %d\n", + pfx, proc->psci_state); + } + + snprintf(newpfx, sizeof(newpfx), "%s ", pfx); + + err_info = (struct cper_arm_err_info *)(proc + 1); + for (i = 0; i < proc->err_info_num; i++) { + printk("%sError info structure %d:\n", pfx, i); + + printk("%snum errors: %d\n", pfx, err_info->multiple_error + 1); + + if (err_info->validation_bits & CPER_ARM_INFO_VALID_FLAGS) { + if (err_info->flags & CPER_ARM_INFO_FLAGS_FIRST) + printk("%sfirst error captured\n", newpfx); + if (err_info->flags & CPER_ARM_INFO_FLAGS_LAST) + printk("%slast error captured\n", newpfx); + if (err_info->flags & CPER_ARM_INFO_FLAGS_PROPAGATED) + printk("%spropagated error captured\n", + newpfx); + if (err_info->flags & CPER_ARM_INFO_FLAGS_OVERFLOW) + printk("%soverflow occurred, error info is incomplete\n", + newpfx); + } + + printk("%serror_type: %d, %s\n", newpfx, err_info->type, + err_info->type < ARRAY_SIZE(cper_proc_error_type_strs) ? + cper_proc_error_type_strs[err_info->type] : "unknown"); + if (err_info->validation_bits & CPER_ARM_INFO_VALID_ERR_INFO) { + printk("%serror_info: 0x%016llx\n", newpfx, + err_info->error_info); + snprintf(infopfx, sizeof(infopfx), "%s ", newpfx); + cper_print_arm_err_info(infopfx, err_info->type, + err_info->error_info); + } + if (err_info->validation_bits & CPER_ARM_INFO_VALID_VIRT_ADDR) + printk("%svirtual fault address: 0x%016llx\n", + newpfx, err_info->virt_fault_addr); + if (err_info->validation_bits & CPER_ARM_INFO_VALID_PHYSICAL_ADDR) + printk("%sphysical fault address: 0x%016llx\n", + newpfx, err_info->physical_fault_addr); + err_info += 1; + } + + ctx_info = (struct cper_arm_ctx_info *)err_info; + max_ctx_type = ARRAY_SIZE(arm_reg_ctx_strs) - 1; + for (i = 0; i < proc->context_info_num; i++) { + int size = sizeof(*ctx_info) + ctx_info->size; + + printk("%sContext info structure %d:\n", pfx, i); + if (len < size) { + printk("%ssection length is too small\n", newpfx); + printk("%sfirmware-generated error record is incorrect\n", pfx); + return; + } + if (ctx_info->type > max_ctx_type) { + printk("%sInvalid context type: %d (max: %d)\n", + newpfx, ctx_info->type, max_ctx_type); + return; + } + printk("%sregister context type: %s\n", newpfx, + arm_reg_ctx_strs[ctx_info->type]); + print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4, + (ctx_info + 1), ctx_info->size, 0); + len -= size; + ctx_info = (struct cper_arm_ctx_info *)((long)ctx_info + size); + } + + if (len > 0) { + printk("%sVendor specific error info has %u bytes:\n", pfx, + len); + print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4, ctx_info, + len, true); + } +} diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c new file mode 100644 index 000000000..2531de49f --- /dev/null +++ b/drivers/firmware/efi/cper-x86.c @@ -0,0 +1,356 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018, Advanced Micro Devices, Inc. + +#include <linux/cper.h> + +/* + * We don't need a "CPER_IA" prefix since these are all locally defined. + * This will save us a lot of line space. + */ +#define VALID_LAPIC_ID BIT_ULL(0) +#define VALID_CPUID_INFO BIT_ULL(1) +#define VALID_PROC_ERR_INFO_NUM(bits) (((bits) & GENMASK_ULL(7, 2)) >> 2) +#define VALID_PROC_CXT_INFO_NUM(bits) (((bits) & GENMASK_ULL(13, 8)) >> 8) + +#define INFO_ERR_STRUCT_TYPE_CACHE \ + GUID_INIT(0xA55701F5, 0xE3EF, 0x43DE, 0xAC, 0x72, 0x24, 0x9B, \ + 0x57, 0x3F, 0xAD, 0x2C) +#define INFO_ERR_STRUCT_TYPE_TLB \ + GUID_INIT(0xFC06B535, 0x5E1F, 0x4562, 0x9F, 0x25, 0x0A, 0x3B, \ + 0x9A, 0xDB, 0x63, 0xC3) +#define INFO_ERR_STRUCT_TYPE_BUS \ + GUID_INIT(0x1CF3F8B3, 0xC5B1, 0x49a2, 0xAA, 0x59, 0x5E, 0xEF, \ + 0x92, 0xFF, 0xA6, 0x3C) +#define INFO_ERR_STRUCT_TYPE_MS \ + GUID_INIT(0x48AB7F57, 0xDC34, 0x4f6c, 0xA7, 0xD3, 0xB0, 0xB5, \ + 0xB0, 0xA7, 0x43, 0x14) + +#define INFO_VALID_CHECK_INFO BIT_ULL(0) +#define INFO_VALID_TARGET_ID BIT_ULL(1) +#define INFO_VALID_REQUESTOR_ID BIT_ULL(2) +#define INFO_VALID_RESPONDER_ID BIT_ULL(3) +#define INFO_VALID_IP BIT_ULL(4) + +#define CHECK_VALID_TRANS_TYPE BIT_ULL(0) +#define CHECK_VALID_OPERATION BIT_ULL(1) +#define CHECK_VALID_LEVEL BIT_ULL(2) +#define CHECK_VALID_PCC BIT_ULL(3) +#define CHECK_VALID_UNCORRECTED BIT_ULL(4) +#define CHECK_VALID_PRECISE_IP BIT_ULL(5) +#define CHECK_VALID_RESTARTABLE_IP BIT_ULL(6) +#define CHECK_VALID_OVERFLOW BIT_ULL(7) + +#define CHECK_VALID_BUS_PART_TYPE BIT_ULL(8) +#define CHECK_VALID_BUS_TIME_OUT BIT_ULL(9) +#define CHECK_VALID_BUS_ADDR_SPACE BIT_ULL(10) + +#define CHECK_VALID_BITS(check) (((check) & GENMASK_ULL(15, 0))) +#define CHECK_TRANS_TYPE(check) (((check) & GENMASK_ULL(17, 16)) >> 16) +#define CHECK_OPERATION(check) (((check) & GENMASK_ULL(21, 18)) >> 18) +#define CHECK_LEVEL(check) (((check) & GENMASK_ULL(24, 22)) >> 22) +#define CHECK_PCC BIT_ULL(25) +#define CHECK_UNCORRECTED BIT_ULL(26) +#define CHECK_PRECISE_IP BIT_ULL(27) +#define CHECK_RESTARTABLE_IP BIT_ULL(28) +#define CHECK_OVERFLOW BIT_ULL(29) + +#define CHECK_BUS_PART_TYPE(check) (((check) & GENMASK_ULL(31, 30)) >> 30) +#define CHECK_BUS_TIME_OUT BIT_ULL(32) +#define CHECK_BUS_ADDR_SPACE(check) (((check) & GENMASK_ULL(34, 33)) >> 33) + +#define CHECK_VALID_MS_ERR_TYPE BIT_ULL(0) +#define CHECK_VALID_MS_PCC BIT_ULL(1) +#define CHECK_VALID_MS_UNCORRECTED BIT_ULL(2) +#define CHECK_VALID_MS_PRECISE_IP BIT_ULL(3) +#define CHECK_VALID_MS_RESTARTABLE_IP BIT_ULL(4) +#define CHECK_VALID_MS_OVERFLOW BIT_ULL(5) + +#define CHECK_MS_ERR_TYPE(check) (((check) & GENMASK_ULL(18, 16)) >> 16) +#define CHECK_MS_PCC BIT_ULL(19) +#define CHECK_MS_UNCORRECTED BIT_ULL(20) +#define CHECK_MS_PRECISE_IP BIT_ULL(21) +#define CHECK_MS_RESTARTABLE_IP BIT_ULL(22) +#define CHECK_MS_OVERFLOW BIT_ULL(23) + +#define CTX_TYPE_MSR 1 +#define CTX_TYPE_MMREG 7 + +enum err_types { + ERR_TYPE_CACHE = 0, + ERR_TYPE_TLB, + ERR_TYPE_BUS, + ERR_TYPE_MS, + N_ERR_TYPES +}; + +static enum err_types cper_get_err_type(const guid_t *err_type) +{ + if (guid_equal(err_type, &INFO_ERR_STRUCT_TYPE_CACHE)) + return ERR_TYPE_CACHE; + else if (guid_equal(err_type, &INFO_ERR_STRUCT_TYPE_TLB)) + return ERR_TYPE_TLB; + else if (guid_equal(err_type, &INFO_ERR_STRUCT_TYPE_BUS)) + return ERR_TYPE_BUS; + else if (guid_equal(err_type, &INFO_ERR_STRUCT_TYPE_MS)) + return ERR_TYPE_MS; + else + return N_ERR_TYPES; +} + +static const char * const ia_check_trans_type_strs[] = { + "Instruction", + "Data Access", + "Generic", +}; + +static const char * const ia_check_op_strs[] = { + "generic error", + "generic read", + "generic write", + "data read", + "data write", + "instruction fetch", + "prefetch", + "eviction", + "snoop", +}; + +static const char * const ia_check_bus_part_type_strs[] = { + "Local Processor originated request", + "Local Processor responded to request", + "Local Processor observed", + "Generic", +}; + +static const char * const ia_check_bus_addr_space_strs[] = { + "Memory Access", + "Reserved", + "I/O", + "Other Transaction", +}; + +static const char * const ia_check_ms_error_type_strs[] = { + "No Error", + "Unclassified", + "Microcode ROM Parity Error", + "External Error", + "FRC Error", + "Internal Unclassified", +}; + +static const char * const ia_reg_ctx_strs[] = { + "Unclassified Data", + "MSR Registers (Machine Check and other MSRs)", + "32-bit Mode Execution Context", + "64-bit Mode Execution Context", + "FXSAVE Context", + "32-bit Mode Debug Registers (DR0-DR7)", + "64-bit Mode Debug Registers (DR0-DR7)", + "Memory Mapped Registers", +}; + +static inline void print_bool(char *str, const char *pfx, u64 check, u64 bit) +{ + printk("%s%s: %s\n", pfx, str, (check & bit) ? "true" : "false"); +} + +static void print_err_info_ms(const char *pfx, u16 validation_bits, u64 check) +{ + if (validation_bits & CHECK_VALID_MS_ERR_TYPE) { + u8 err_type = CHECK_MS_ERR_TYPE(check); + + printk("%sError Type: %u, %s\n", pfx, err_type, + err_type < ARRAY_SIZE(ia_check_ms_error_type_strs) ? + ia_check_ms_error_type_strs[err_type] : "unknown"); + } + + if (validation_bits & CHECK_VALID_MS_PCC) + print_bool("Processor Context Corrupt", pfx, check, CHECK_MS_PCC); + + if (validation_bits & CHECK_VALID_MS_UNCORRECTED) + print_bool("Uncorrected", pfx, check, CHECK_MS_UNCORRECTED); + + if (validation_bits & CHECK_VALID_MS_PRECISE_IP) + print_bool("Precise IP", pfx, check, CHECK_MS_PRECISE_IP); + + if (validation_bits & CHECK_VALID_MS_RESTARTABLE_IP) + print_bool("Restartable IP", pfx, check, CHECK_MS_RESTARTABLE_IP); + + if (validation_bits & CHECK_VALID_MS_OVERFLOW) + print_bool("Overflow", pfx, check, CHECK_MS_OVERFLOW); +} + +static void print_err_info(const char *pfx, u8 err_type, u64 check) +{ + u16 validation_bits = CHECK_VALID_BITS(check); + + /* + * The MS Check structure varies a lot from the others, so use a + * separate function for decoding. + */ + if (err_type == ERR_TYPE_MS) + return print_err_info_ms(pfx, validation_bits, check); + + if (validation_bits & CHECK_VALID_TRANS_TYPE) { + u8 trans_type = CHECK_TRANS_TYPE(check); + + printk("%sTransaction Type: %u, %s\n", pfx, trans_type, + trans_type < ARRAY_SIZE(ia_check_trans_type_strs) ? + ia_check_trans_type_strs[trans_type] : "unknown"); + } + + if (validation_bits & CHECK_VALID_OPERATION) { + u8 op = CHECK_OPERATION(check); + + /* + * CACHE has more operation types than TLB or BUS, though the + * name and the order are the same. + */ + u8 max_ops = (err_type == ERR_TYPE_CACHE) ? 9 : 7; + + printk("%sOperation: %u, %s\n", pfx, op, + op < max_ops ? ia_check_op_strs[op] : "unknown"); + } + + if (validation_bits & CHECK_VALID_LEVEL) + printk("%sLevel: %llu\n", pfx, CHECK_LEVEL(check)); + + if (validation_bits & CHECK_VALID_PCC) + print_bool("Processor Context Corrupt", pfx, check, CHECK_PCC); + + if (validation_bits & CHECK_VALID_UNCORRECTED) + print_bool("Uncorrected", pfx, check, CHECK_UNCORRECTED); + + if (validation_bits & CHECK_VALID_PRECISE_IP) + print_bool("Precise IP", pfx, check, CHECK_PRECISE_IP); + + if (validation_bits & CHECK_VALID_RESTARTABLE_IP) + print_bool("Restartable IP", pfx, check, CHECK_RESTARTABLE_IP); + + if (validation_bits & CHECK_VALID_OVERFLOW) + print_bool("Overflow", pfx, check, CHECK_OVERFLOW); + + if (err_type != ERR_TYPE_BUS) + return; + + if (validation_bits & CHECK_VALID_BUS_PART_TYPE) { + u8 part_type = CHECK_BUS_PART_TYPE(check); + + printk("%sParticipation Type: %u, %s\n", pfx, part_type, + part_type < ARRAY_SIZE(ia_check_bus_part_type_strs) ? + ia_check_bus_part_type_strs[part_type] : "unknown"); + } + + if (validation_bits & CHECK_VALID_BUS_TIME_OUT) + print_bool("Time Out", pfx, check, CHECK_BUS_TIME_OUT); + + if (validation_bits & CHECK_VALID_BUS_ADDR_SPACE) { + u8 addr_space = CHECK_BUS_ADDR_SPACE(check); + + printk("%sAddress Space: %u, %s\n", pfx, addr_space, + addr_space < ARRAY_SIZE(ia_check_bus_addr_space_strs) ? + ia_check_bus_addr_space_strs[addr_space] : "unknown"); + } +} + +void cper_print_proc_ia(const char *pfx, const struct cper_sec_proc_ia *proc) +{ + int i; + struct cper_ia_err_info *err_info; + struct cper_ia_proc_ctx *ctx_info; + char newpfx[64], infopfx[64]; + u8 err_type; + + if (proc->validation_bits & VALID_LAPIC_ID) + printk("%sLocal APIC_ID: 0x%llx\n", pfx, proc->lapic_id); + + if (proc->validation_bits & VALID_CPUID_INFO) { + printk("%sCPUID Info:\n", pfx); + print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, proc->cpuid, + sizeof(proc->cpuid), 0); + } + + snprintf(newpfx, sizeof(newpfx), "%s ", pfx); + + err_info = (struct cper_ia_err_info *)(proc + 1); + for (i = 0; i < VALID_PROC_ERR_INFO_NUM(proc->validation_bits); i++) { + printk("%sError Information Structure %d:\n", pfx, i); + + err_type = cper_get_err_type(&err_info->err_type); + printk("%sError Structure Type: %s\n", newpfx, + err_type < ARRAY_SIZE(cper_proc_error_type_strs) ? + cper_proc_error_type_strs[err_type] : "unknown"); + + if (err_type >= N_ERR_TYPES) { + printk("%sError Structure Type: %pUl\n", newpfx, + &err_info->err_type); + } + + if (err_info->validation_bits & INFO_VALID_CHECK_INFO) { + printk("%sCheck Information: 0x%016llx\n", newpfx, + err_info->check_info); + + if (err_type < N_ERR_TYPES) { + snprintf(infopfx, sizeof(infopfx), "%s ", + newpfx); + + print_err_info(infopfx, err_type, + err_info->check_info); + } + } + + if (err_info->validation_bits & INFO_VALID_TARGET_ID) { + printk("%sTarget Identifier: 0x%016llx\n", + newpfx, err_info->target_id); + } + + if (err_info->validation_bits & INFO_VALID_REQUESTOR_ID) { + printk("%sRequestor Identifier: 0x%016llx\n", + newpfx, err_info->requestor_id); + } + + if (err_info->validation_bits & INFO_VALID_RESPONDER_ID) { + printk("%sResponder Identifier: 0x%016llx\n", + newpfx, err_info->responder_id); + } + + if (err_info->validation_bits & INFO_VALID_IP) { + printk("%sInstruction Pointer: 0x%016llx\n", + newpfx, err_info->ip); + } + + err_info++; + } + + ctx_info = (struct cper_ia_proc_ctx *)err_info; + for (i = 0; i < VALID_PROC_CXT_INFO_NUM(proc->validation_bits); i++) { + int size = sizeof(*ctx_info) + ctx_info->reg_arr_size; + int groupsize = 4; + + printk("%sContext Information Structure %d:\n", pfx, i); + + printk("%sRegister Context Type: %s\n", newpfx, + ctx_info->reg_ctx_type < ARRAY_SIZE(ia_reg_ctx_strs) ? + ia_reg_ctx_strs[ctx_info->reg_ctx_type] : "unknown"); + + printk("%sRegister Array Size: 0x%04x\n", newpfx, + ctx_info->reg_arr_size); + + if (ctx_info->reg_ctx_type == CTX_TYPE_MSR) { + groupsize = 8; /* MSRs are 8 bytes wide. */ + printk("%sMSR Address: 0x%08x\n", newpfx, + ctx_info->msr_addr); + } + + if (ctx_info->reg_ctx_type == CTX_TYPE_MMREG) { + printk("%sMM Register Address: 0x%016llx\n", newpfx, + ctx_info->mm_reg_addr); + } + + printk("%sRegister Array:\n", newpfx); + print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, groupsize, + (ctx_info + 1), ctx_info->reg_arr_size, 0); + + ctx_info = (struct cper_ia_proc_ctx *)((long)ctx_info + size); + } +} diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c new file mode 100644 index 000000000..232c092c4 --- /dev/null +++ b/drivers/firmware/efi/cper.c @@ -0,0 +1,650 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * UEFI Common Platform Error Record (CPER) support + * + * Copyright (C) 2010, Intel Corp. + * Author: Huang Ying <ying.huang@intel.com> + * + * CPER is the format used to describe platform hardware error by + * various tables, such as ERST, BERT and HEST etc. + * + * For more information about CPER, please refer to Appendix N of UEFI + * Specification version 2.4. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/time.h> +#include <linux/cper.h> +#include <linux/dmi.h> +#include <linux/acpi.h> +#include <linux/pci.h> +#include <linux/aer.h> +#include <linux/printk.h> +#include <linux/bcd.h> +#include <acpi/ghes.h> +#include <ras/ras_event.h> + +/* + * CPER record ID need to be unique even after reboot, because record + * ID is used as index for ERST storage, while CPER records from + * multiple boot may co-exist in ERST. + */ +u64 cper_next_record_id(void) +{ + static atomic64_t seq; + + if (!atomic64_read(&seq)) { + time64_t time = ktime_get_real_seconds(); + + /* + * This code is unlikely to still be needed in year 2106, + * but just in case, let's use a few more bits for timestamps + * after y2038 to be sure they keep increasing monotonically + * for the next few hundred years... + */ + if (time < 0x80000000) + atomic64_set(&seq, (ktime_get_real_seconds()) << 32); + else + atomic64_set(&seq, 0x8000000000000000ull | + ktime_get_real_seconds() << 24); + } + + return atomic64_inc_return(&seq); +} +EXPORT_SYMBOL_GPL(cper_next_record_id); + +static const char * const severity_strs[] = { + "recoverable", + "fatal", + "corrected", + "info", +}; + +const char *cper_severity_str(unsigned int severity) +{ + return severity < ARRAY_SIZE(severity_strs) ? + severity_strs[severity] : "unknown"; +} +EXPORT_SYMBOL_GPL(cper_severity_str); + +/* + * cper_print_bits - print strings for set bits + * @pfx: prefix for each line, including log level and prefix string + * @bits: bit mask + * @strs: string array, indexed by bit position + * @strs_size: size of the string array: @strs + * + * For each set bit in @bits, print the corresponding string in @strs. + * If the output length is longer than 80, multiple line will be + * printed, with @pfx is printed at the beginning of each line. + */ +void cper_print_bits(const char *pfx, unsigned int bits, + const char * const strs[], unsigned int strs_size) +{ + int i, len = 0; + const char *str; + char buf[84]; + + for (i = 0; i < strs_size; i++) { + if (!(bits & (1U << i))) + continue; + str = strs[i]; + if (!str) + continue; + if (len && len + strlen(str) + 2 > 80) { + printk("%s\n", buf); + len = 0; + } + if (!len) + len = snprintf(buf, sizeof(buf), "%s%s", pfx, str); + else + len += scnprintf(buf+len, sizeof(buf)-len, ", %s", str); + } + if (len) + printk("%s\n", buf); +} + +static const char * const proc_type_strs[] = { + "IA32/X64", + "IA64", + "ARM", +}; + +static const char * const proc_isa_strs[] = { + "IA32", + "IA64", + "X64", + "ARM A32/T32", + "ARM A64", +}; + +const char * const cper_proc_error_type_strs[] = { + "cache error", + "TLB error", + "bus error", + "micro-architectural error", +}; + +static const char * const proc_op_strs[] = { + "unknown or generic", + "data read", + "data write", + "instruction execution", +}; + +static const char * const proc_flag_strs[] = { + "restartable", + "precise IP", + "overflow", + "corrected", +}; + +static void cper_print_proc_generic(const char *pfx, + const struct cper_sec_proc_generic *proc) +{ + if (proc->validation_bits & CPER_PROC_VALID_TYPE) + printk("%s""processor_type: %d, %s\n", pfx, proc->proc_type, + proc->proc_type < ARRAY_SIZE(proc_type_strs) ? + proc_type_strs[proc->proc_type] : "unknown"); + if (proc->validation_bits & CPER_PROC_VALID_ISA) + printk("%s""processor_isa: %d, %s\n", pfx, proc->proc_isa, + proc->proc_isa < ARRAY_SIZE(proc_isa_strs) ? + proc_isa_strs[proc->proc_isa] : "unknown"); + if (proc->validation_bits & CPER_PROC_VALID_ERROR_TYPE) { + printk("%s""error_type: 0x%02x\n", pfx, proc->proc_error_type); + cper_print_bits(pfx, proc->proc_error_type, + cper_proc_error_type_strs, + ARRAY_SIZE(cper_proc_error_type_strs)); + } + if (proc->validation_bits & CPER_PROC_VALID_OPERATION) + printk("%s""operation: %d, %s\n", pfx, proc->operation, + proc->operation < ARRAY_SIZE(proc_op_strs) ? + proc_op_strs[proc->operation] : "unknown"); + if (proc->validation_bits & CPER_PROC_VALID_FLAGS) { + printk("%s""flags: 0x%02x\n", pfx, proc->flags); + cper_print_bits(pfx, proc->flags, proc_flag_strs, + ARRAY_SIZE(proc_flag_strs)); + } + if (proc->validation_bits & CPER_PROC_VALID_LEVEL) + printk("%s""level: %d\n", pfx, proc->level); + if (proc->validation_bits & CPER_PROC_VALID_VERSION) + printk("%s""version_info: 0x%016llx\n", pfx, proc->cpu_version); + if (proc->validation_bits & CPER_PROC_VALID_ID) + printk("%s""processor_id: 0x%016llx\n", pfx, proc->proc_id); + if (proc->validation_bits & CPER_PROC_VALID_TARGET_ADDRESS) + printk("%s""target_address: 0x%016llx\n", + pfx, proc->target_addr); + if (proc->validation_bits & CPER_PROC_VALID_REQUESTOR_ID) + printk("%s""requestor_id: 0x%016llx\n", + pfx, proc->requestor_id); + if (proc->validation_bits & CPER_PROC_VALID_RESPONDER_ID) + printk("%s""responder_id: 0x%016llx\n", + pfx, proc->responder_id); + if (proc->validation_bits & CPER_PROC_VALID_IP) + printk("%s""IP: 0x%016llx\n", pfx, proc->ip); +} + +static const char * const mem_err_type_strs[] = { + "unknown", + "no error", + "single-bit ECC", + "multi-bit ECC", + "single-symbol chipkill ECC", + "multi-symbol chipkill ECC", + "master abort", + "target abort", + "parity error", + "watchdog timeout", + "invalid address", + "mirror Broken", + "memory sparing", + "scrub corrected error", + "scrub uncorrected error", + "physical memory map-out event", +}; + +const char *cper_mem_err_type_str(unsigned int etype) +{ + return etype < ARRAY_SIZE(mem_err_type_strs) ? + mem_err_type_strs[etype] : "unknown"; +} +EXPORT_SYMBOL_GPL(cper_mem_err_type_str); + +static int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg) +{ + u32 len, n; + + if (!msg) + return 0; + + n = 0; + len = CPER_REC_LEN - 1; + if (mem->validation_bits & CPER_MEM_VALID_NODE) + n += scnprintf(msg + n, len - n, "node: %d ", mem->node); + if (mem->validation_bits & CPER_MEM_VALID_CARD) + n += scnprintf(msg + n, len - n, "card: %d ", mem->card); + if (mem->validation_bits & CPER_MEM_VALID_MODULE) + n += scnprintf(msg + n, len - n, "module: %d ", mem->module); + if (mem->validation_bits & CPER_MEM_VALID_RANK_NUMBER) + n += scnprintf(msg + n, len - n, "rank: %d ", mem->rank); + if (mem->validation_bits & CPER_MEM_VALID_BANK) + n += scnprintf(msg + n, len - n, "bank: %d ", mem->bank); + if (mem->validation_bits & CPER_MEM_VALID_BANK_GROUP) + n += scnprintf(msg + n, len - n, "bank_group: %d ", + mem->bank >> CPER_MEM_BANK_GROUP_SHIFT); + if (mem->validation_bits & CPER_MEM_VALID_BANK_ADDRESS) + n += scnprintf(msg + n, len - n, "bank_address: %d ", + mem->bank & CPER_MEM_BANK_ADDRESS_MASK); + if (mem->validation_bits & CPER_MEM_VALID_DEVICE) + n += scnprintf(msg + n, len - n, "device: %d ", mem->device); + if (mem->validation_bits & (CPER_MEM_VALID_ROW | CPER_MEM_VALID_ROW_EXT)) { + u32 row = mem->row; + + row |= cper_get_mem_extension(mem->validation_bits, mem->extended); + n += scnprintf(msg + n, len - n, "row: %d ", row); + } + if (mem->validation_bits & CPER_MEM_VALID_COLUMN) + n += scnprintf(msg + n, len - n, "column: %d ", mem->column); + if (mem->validation_bits & CPER_MEM_VALID_BIT_POSITION) + n += scnprintf(msg + n, len - n, "bit_position: %d ", + mem->bit_pos); + if (mem->validation_bits & CPER_MEM_VALID_REQUESTOR_ID) + n += scnprintf(msg + n, len - n, "requestor_id: 0x%016llx ", + mem->requestor_id); + if (mem->validation_bits & CPER_MEM_VALID_RESPONDER_ID) + n += scnprintf(msg + n, len - n, "responder_id: 0x%016llx ", + mem->responder_id); + if (mem->validation_bits & CPER_MEM_VALID_TARGET_ID) + scnprintf(msg + n, len - n, "target_id: 0x%016llx ", + mem->target_id); + if (mem->validation_bits & CPER_MEM_VALID_CHIP_ID) + scnprintf(msg + n, len - n, "chip_id: %d ", + mem->extended >> CPER_MEM_CHIP_ID_SHIFT); + + msg[n] = '\0'; + return n; +} + +static int cper_dimm_err_location(struct cper_mem_err_compact *mem, char *msg) +{ + u32 len, n; + const char *bank = NULL, *device = NULL; + + if (!msg || !(mem->validation_bits & CPER_MEM_VALID_MODULE_HANDLE)) + return 0; + + len = CPER_REC_LEN; + dmi_memdev_name(mem->mem_dev_handle, &bank, &device); + if (bank && device) + n = snprintf(msg, len, "DIMM location: %s %s ", bank, device); + else + n = snprintf(msg, len, + "DIMM location: not present. DMI handle: 0x%.4x ", + mem->mem_dev_handle); + + return n; +} + +void cper_mem_err_pack(const struct cper_sec_mem_err *mem, + struct cper_mem_err_compact *cmem) +{ + cmem->validation_bits = mem->validation_bits; + cmem->node = mem->node; + cmem->card = mem->card; + cmem->module = mem->module; + cmem->bank = mem->bank; + cmem->device = mem->device; + cmem->row = mem->row; + cmem->column = mem->column; + cmem->bit_pos = mem->bit_pos; + cmem->requestor_id = mem->requestor_id; + cmem->responder_id = mem->responder_id; + cmem->target_id = mem->target_id; + cmem->extended = mem->extended; + cmem->rank = mem->rank; + cmem->mem_array_handle = mem->mem_array_handle; + cmem->mem_dev_handle = mem->mem_dev_handle; +} + +const char *cper_mem_err_unpack(struct trace_seq *p, + struct cper_mem_err_compact *cmem) +{ + const char *ret = trace_seq_buffer_ptr(p); + char rcd_decode_str[CPER_REC_LEN]; + + if (cper_mem_err_location(cmem, rcd_decode_str)) + trace_seq_printf(p, "%s", rcd_decode_str); + if (cper_dimm_err_location(cmem, rcd_decode_str)) + trace_seq_printf(p, "%s", rcd_decode_str); + trace_seq_putc(p, '\0'); + + return ret; +} + +static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem, + int len) +{ + struct cper_mem_err_compact cmem; + char rcd_decode_str[CPER_REC_LEN]; + + /* Don't trust UEFI 2.1/2.2 structure with bad validation bits */ + if (len == sizeof(struct cper_sec_mem_err_old) && + (mem->validation_bits & ~(CPER_MEM_VALID_RANK_NUMBER - 1))) { + pr_err(FW_WARN "valid bits set for fields beyond structure\n"); + return; + } + if (mem->validation_bits & CPER_MEM_VALID_ERROR_STATUS) + printk("%s""error_status: 0x%016llx\n", pfx, mem->error_status); + if (mem->validation_bits & CPER_MEM_VALID_PA) + printk("%s""physical_address: 0x%016llx\n", + pfx, mem->physical_addr); + if (mem->validation_bits & CPER_MEM_VALID_PA_MASK) + printk("%s""physical_address_mask: 0x%016llx\n", + pfx, mem->physical_addr_mask); + cper_mem_err_pack(mem, &cmem); + if (cper_mem_err_location(&cmem, rcd_decode_str)) + printk("%s%s\n", pfx, rcd_decode_str); + if (mem->validation_bits & CPER_MEM_VALID_ERROR_TYPE) { + u8 etype = mem->error_type; + printk("%s""error_type: %d, %s\n", pfx, etype, + cper_mem_err_type_str(etype)); + } + if (cper_dimm_err_location(&cmem, rcd_decode_str)) + printk("%s%s\n", pfx, rcd_decode_str); +} + +static const char * const pcie_port_type_strs[] = { + "PCIe end point", + "legacy PCI end point", + "unknown", + "unknown", + "root port", + "upstream switch port", + "downstream switch port", + "PCIe to PCI/PCI-X bridge", + "PCI/PCI-X to PCIe bridge", + "root complex integrated endpoint device", + "root complex event collector", +}; + +static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie, + const struct acpi_hest_generic_data *gdata) +{ + if (pcie->validation_bits & CPER_PCIE_VALID_PORT_TYPE) + printk("%s""port_type: %d, %s\n", pfx, pcie->port_type, + pcie->port_type < ARRAY_SIZE(pcie_port_type_strs) ? + pcie_port_type_strs[pcie->port_type] : "unknown"); + if (pcie->validation_bits & CPER_PCIE_VALID_VERSION) + printk("%s""version: %d.%d\n", pfx, + pcie->version.major, pcie->version.minor); + if (pcie->validation_bits & CPER_PCIE_VALID_COMMAND_STATUS) + printk("%s""command: 0x%04x, status: 0x%04x\n", pfx, + pcie->command, pcie->status); + if (pcie->validation_bits & CPER_PCIE_VALID_DEVICE_ID) { + const __u8 *p; + printk("%s""device_id: %04x:%02x:%02x.%x\n", pfx, + pcie->device_id.segment, pcie->device_id.bus, + pcie->device_id.device, pcie->device_id.function); + printk("%s""slot: %d\n", pfx, + pcie->device_id.slot >> CPER_PCIE_SLOT_SHIFT); + printk("%s""secondary_bus: 0x%02x\n", pfx, + pcie->device_id.secondary_bus); + printk("%s""vendor_id: 0x%04x, device_id: 0x%04x\n", pfx, + pcie->device_id.vendor_id, pcie->device_id.device_id); + p = pcie->device_id.class_code; + printk("%s""class_code: %02x%02x%02x\n", pfx, p[2], p[1], p[0]); + } + if (pcie->validation_bits & CPER_PCIE_VALID_SERIAL_NUMBER) + printk("%s""serial number: 0x%04x, 0x%04x\n", pfx, + pcie->serial_number.lower, pcie->serial_number.upper); + if (pcie->validation_bits & CPER_PCIE_VALID_BRIDGE_CONTROL_STATUS) + printk( + "%s""bridge: secondary_status: 0x%04x, control: 0x%04x\n", + pfx, pcie->bridge.secondary_status, pcie->bridge.control); + + /* Fatal errors call __ghes_panic() before AER handler prints this */ + if ((pcie->validation_bits & CPER_PCIE_VALID_AER_INFO) && + (gdata->error_severity & CPER_SEV_FATAL)) { + struct aer_capability_regs *aer; + + aer = (struct aer_capability_regs *)pcie->aer_info; + printk("%saer_uncor_status: 0x%08x, aer_uncor_mask: 0x%08x\n", + pfx, aer->uncor_status, aer->uncor_mask); + printk("%saer_uncor_severity: 0x%08x\n", + pfx, aer->uncor_severity); + printk("%sTLP Header: %08x %08x %08x %08x\n", pfx, + aer->header_log.dw0, aer->header_log.dw1, + aer->header_log.dw2, aer->header_log.dw3); + } +} + +static const char * const fw_err_rec_type_strs[] = { + "IPF SAL Error Record", + "SOC Firmware Error Record Type1 (Legacy CrashLog Support)", + "SOC Firmware Error Record Type2", +}; + +static void cper_print_fw_err(const char *pfx, + struct acpi_hest_generic_data *gdata, + const struct cper_sec_fw_err_rec_ref *fw_err) +{ + void *buf = acpi_hest_get_payload(gdata); + u32 offset, length = gdata->error_data_length; + + printk("%s""Firmware Error Record Type: %s\n", pfx, + fw_err->record_type < ARRAY_SIZE(fw_err_rec_type_strs) ? + fw_err_rec_type_strs[fw_err->record_type] : "unknown"); + printk("%s""Revision: %d\n", pfx, fw_err->revision); + + /* Record Type based on UEFI 2.7 */ + if (fw_err->revision == 0) { + printk("%s""Record Identifier: %08llx\n", pfx, + fw_err->record_identifier); + } else if (fw_err->revision == 2) { + printk("%s""Record Identifier: %pUl\n", pfx, + &fw_err->record_identifier_guid); + } + + /* + * The FW error record may contain trailing data beyond the + * structure defined by the specification. As the fields + * defined (and hence the offset of any trailing data) vary + * with the revision, set the offset to account for this + * variation. + */ + if (fw_err->revision == 0) { + /* record_identifier_guid not defined */ + offset = offsetof(struct cper_sec_fw_err_rec_ref, + record_identifier_guid); + } else if (fw_err->revision == 1) { + /* record_identifier not defined */ + offset = offsetof(struct cper_sec_fw_err_rec_ref, + record_identifier); + } else { + offset = sizeof(*fw_err); + } + + buf += offset; + length -= offset; + + print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, buf, length, true); +} + +static void cper_print_tstamp(const char *pfx, + struct acpi_hest_generic_data_v300 *gdata) +{ + __u8 hour, min, sec, day, mon, year, century, *timestamp; + + if (gdata->validation_bits & ACPI_HEST_GEN_VALID_TIMESTAMP) { + timestamp = (__u8 *)&(gdata->time_stamp); + sec = bcd2bin(timestamp[0]); + min = bcd2bin(timestamp[1]); + hour = bcd2bin(timestamp[2]); + day = bcd2bin(timestamp[4]); + mon = bcd2bin(timestamp[5]); + year = bcd2bin(timestamp[6]); + century = bcd2bin(timestamp[7]); + + printk("%s%ststamp: %02d%02d-%02d-%02d %02d:%02d:%02d\n", pfx, + (timestamp[3] & 0x1 ? "precise " : "imprecise "), + century, year, mon, day, hour, min, sec); + } +} + +static void +cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata, + int sec_no) +{ + guid_t *sec_type = (guid_t *)gdata->section_type; + __u16 severity; + char newpfx[64]; + + if (acpi_hest_get_version(gdata) >= 3) + cper_print_tstamp(pfx, (struct acpi_hest_generic_data_v300 *)gdata); + + severity = gdata->error_severity; + printk("%s""Error %d, type: %s\n", pfx, sec_no, + cper_severity_str(severity)); + if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID) + printk("%s""fru_id: %pUl\n", pfx, gdata->fru_id); + if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT) + printk("%s""fru_text: %.20s\n", pfx, gdata->fru_text); + + snprintf(newpfx, sizeof(newpfx), "%s ", pfx); + if (guid_equal(sec_type, &CPER_SEC_PROC_GENERIC)) { + struct cper_sec_proc_generic *proc_err = acpi_hest_get_payload(gdata); + + printk("%s""section_type: general processor error\n", newpfx); + if (gdata->error_data_length >= sizeof(*proc_err)) + cper_print_proc_generic(newpfx, proc_err); + else + goto err_section_too_small; + } else if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) { + struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata); + + printk("%s""section_type: memory error\n", newpfx); + if (gdata->error_data_length >= + sizeof(struct cper_sec_mem_err_old)) + cper_print_mem(newpfx, mem_err, + gdata->error_data_length); + else + goto err_section_too_small; + } else if (guid_equal(sec_type, &CPER_SEC_PCIE)) { + struct cper_sec_pcie *pcie = acpi_hest_get_payload(gdata); + + printk("%s""section_type: PCIe error\n", newpfx); + if (gdata->error_data_length >= sizeof(*pcie)) + cper_print_pcie(newpfx, pcie, gdata); + else + goto err_section_too_small; +#if defined(CONFIG_ARM64) || defined(CONFIG_ARM) + } else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) { + struct cper_sec_proc_arm *arm_err = acpi_hest_get_payload(gdata); + + printk("%ssection_type: ARM processor error\n", newpfx); + if (gdata->error_data_length >= sizeof(*arm_err)) + cper_print_proc_arm(newpfx, arm_err); + else + goto err_section_too_small; +#endif +#if defined(CONFIG_UEFI_CPER_X86) + } else if (guid_equal(sec_type, &CPER_SEC_PROC_IA)) { + struct cper_sec_proc_ia *ia_err = acpi_hest_get_payload(gdata); + + printk("%ssection_type: IA32/X64 processor error\n", newpfx); + if (gdata->error_data_length >= sizeof(*ia_err)) + cper_print_proc_ia(newpfx, ia_err); + else + goto err_section_too_small; +#endif + } else if (guid_equal(sec_type, &CPER_SEC_FW_ERR_REC_REF)) { + struct cper_sec_fw_err_rec_ref *fw_err = acpi_hest_get_payload(gdata); + + printk("%ssection_type: Firmware Error Record Reference\n", + newpfx); + /* The minimal FW Error Record contains 16 bytes */ + if (gdata->error_data_length >= SZ_16) + cper_print_fw_err(newpfx, gdata, fw_err); + else + goto err_section_too_small; + } else { + const void *err = acpi_hest_get_payload(gdata); + + printk("%ssection type: unknown, %pUl\n", newpfx, sec_type); + printk("%ssection length: %#x\n", newpfx, + gdata->error_data_length); + print_hex_dump(newpfx, "", DUMP_PREFIX_OFFSET, 16, 4, err, + gdata->error_data_length, true); + } + + return; + +err_section_too_small: + pr_err(FW_WARN "error section length is too small\n"); +} + +void cper_estatus_print(const char *pfx, + const struct acpi_hest_generic_status *estatus) +{ + struct acpi_hest_generic_data *gdata; + int sec_no = 0; + char newpfx[64]; + __u16 severity; + + severity = estatus->error_severity; + if (severity == CPER_SEV_CORRECTED) + printk("%s%s\n", pfx, + "It has been corrected by h/w " + "and requires no further action"); + printk("%s""event severity: %s\n", pfx, cper_severity_str(severity)); + snprintf(newpfx, sizeof(newpfx), "%s ", pfx); + + apei_estatus_for_each_section(estatus, gdata) { + cper_estatus_print_section(newpfx, gdata, sec_no); + sec_no++; + } +} +EXPORT_SYMBOL_GPL(cper_estatus_print); + +int cper_estatus_check_header(const struct acpi_hest_generic_status *estatus) +{ + if (estatus->data_length && + estatus->data_length < sizeof(struct acpi_hest_generic_data)) + return -EINVAL; + if (estatus->raw_data_length && + estatus->raw_data_offset < sizeof(*estatus) + estatus->data_length) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(cper_estatus_check_header); + +int cper_estatus_check(const struct acpi_hest_generic_status *estatus) +{ + struct acpi_hest_generic_data *gdata; + unsigned int data_len, record_size; + int rc; + + rc = cper_estatus_check_header(estatus); + if (rc) + return rc; + + data_len = estatus->data_length; + + apei_estatus_for_each_section(estatus, gdata) { + if (sizeof(struct acpi_hest_generic_data) > data_len) + return -EINVAL; + + record_size = acpi_hest_get_record_size(gdata); + if (record_size > data_len) + return -EINVAL; + + data_len -= record_size; + } + if (data_len) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(cper_estatus_check); diff --git a/drivers/firmware/efi/dev-path-parser.c b/drivers/firmware/efi/dev-path-parser.c new file mode 100644 index 000000000..5c9625e55 --- /dev/null +++ b/drivers/firmware/efi/dev-path-parser.c @@ -0,0 +1,196 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * dev-path-parser.c - EFI Device Path parser + * Copyright (C) 2016 Lukas Wunner <lukas@wunner.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License (version 2) as + * published by the Free Software Foundation. + */ + +#include <linux/acpi.h> +#include <linux/efi.h> +#include <linux/pci.h> + +struct acpi_hid_uid { + struct acpi_device_id hid[2]; + char uid[11]; /* UINT_MAX + null byte */ +}; + +static int __init match_acpi_dev(struct device *dev, const void *data) +{ + struct acpi_hid_uid hid_uid = *(const struct acpi_hid_uid *)data; + struct acpi_device *adev = to_acpi_device(dev); + + if (acpi_match_device_ids(adev, hid_uid.hid)) + return 0; + + if (adev->pnp.unique_id) + return !strcmp(adev->pnp.unique_id, hid_uid.uid); + else + return !strcmp("0", hid_uid.uid); +} + +static long __init parse_acpi_path(const struct efi_dev_path *node, + struct device *parent, struct device **child) +{ + struct acpi_hid_uid hid_uid = {}; + struct device *phys_dev; + + if (node->header.length != 12) + return -EINVAL; + + sprintf(hid_uid.hid[0].id, "%c%c%c%04X", + 'A' + ((node->acpi.hid >> 10) & 0x1f) - 1, + 'A' + ((node->acpi.hid >> 5) & 0x1f) - 1, + 'A' + ((node->acpi.hid >> 0) & 0x1f) - 1, + node->acpi.hid >> 16); + sprintf(hid_uid.uid, "%u", node->acpi.uid); + + *child = bus_find_device(&acpi_bus_type, NULL, &hid_uid, + match_acpi_dev); + if (!*child) + return -ENODEV; + + phys_dev = acpi_get_first_physical_node(to_acpi_device(*child)); + if (phys_dev) { + get_device(phys_dev); + put_device(*child); + *child = phys_dev; + } + + return 0; +} + +static int __init match_pci_dev(struct device *dev, void *data) +{ + unsigned int devfn = *(unsigned int *)data; + + return dev_is_pci(dev) && to_pci_dev(dev)->devfn == devfn; +} + +static long __init parse_pci_path(const struct efi_dev_path *node, + struct device *parent, struct device **child) +{ + unsigned int devfn; + + if (node->header.length != 6) + return -EINVAL; + if (!parent) + return -EINVAL; + + devfn = PCI_DEVFN(node->pci.dev, node->pci.fn); + + *child = device_find_child(parent, &devfn, match_pci_dev); + if (!*child) + return -ENODEV; + + return 0; +} + +/* + * Insert parsers for further node types here. + * + * Each parser takes a pointer to the @node and to the @parent (will be NULL + * for the first device path node). If a device corresponding to @node was + * found below @parent, its reference count should be incremented and the + * device returned in @child. + * + * The return value should be 0 on success or a negative int on failure. + * The special return values 0x01 (EFI_DEV_END_INSTANCE) and 0xFF + * (EFI_DEV_END_ENTIRE) signal the end of the device path, only + * parse_end_path() is supposed to return this. + * + * Be sure to validate the node length and contents before commencing the + * search for a device. + */ + +static long __init parse_end_path(const struct efi_dev_path *node, + struct device *parent, struct device **child) +{ + if (node->header.length != 4) + return -EINVAL; + if (node->header.sub_type != EFI_DEV_END_INSTANCE && + node->header.sub_type != EFI_DEV_END_ENTIRE) + return -EINVAL; + if (!parent) + return -ENODEV; + + *child = get_device(parent); + return node->header.sub_type; +} + +/** + * efi_get_device_by_path - find device by EFI Device Path + * @node: EFI Device Path + * @len: maximum length of EFI Device Path in bytes + * + * Parse a series of EFI Device Path nodes at @node and find the corresponding + * device. If the device was found, its reference count is incremented and a + * pointer to it is returned. The caller needs to drop the reference with + * put_device() after use. The @node pointer is updated to point to the + * location immediately after the "End of Hardware Device Path" node. + * + * If another Device Path instance follows, @len is decremented by the number + * of bytes consumed. Otherwise @len is set to %0. + * + * If a Device Path node is malformed or its corresponding device is not found, + * @node is updated to point to this offending node and an ERR_PTR is returned. + * + * If @len is initially %0, the function returns %NULL. Thus, to iterate over + * all instances in a path, the following idiom may be used: + * + * while (!IS_ERR_OR_NULL(dev = efi_get_device_by_path(&node, &len))) { + * // do something with dev + * put_device(dev); + * } + * if (IS_ERR(dev)) + * // report error + * + * Devices can only be found if they're already instantiated. Most buses + * instantiate devices in the "subsys" initcall level, hence the earliest + * initcall level in which this function should be called is "fs". + * + * Returns the device on success or + * %ERR_PTR(-ENODEV) if no device was found, + * %ERR_PTR(-EINVAL) if a node is malformed or exceeds @len, + * %ERR_PTR(-ENOTSUPP) if support for a node type is not yet implemented. + */ +struct device * __init efi_get_device_by_path(const struct efi_dev_path **node, + size_t *len) +{ + struct device *parent = NULL, *child; + long ret = 0; + + if (!*len) + return NULL; + + while (!ret) { + if (*len < 4 || *len < (*node)->header.length) + ret = -EINVAL; + else if ((*node)->header.type == EFI_DEV_ACPI && + (*node)->header.sub_type == EFI_DEV_BASIC_ACPI) + ret = parse_acpi_path(*node, parent, &child); + else if ((*node)->header.type == EFI_DEV_HW && + (*node)->header.sub_type == EFI_DEV_PCI) + ret = parse_pci_path(*node, parent, &child); + else if (((*node)->header.type == EFI_DEV_END_PATH || + (*node)->header.type == EFI_DEV_END_PATH2)) + ret = parse_end_path(*node, parent, &child); + else + ret = -ENOTSUPP; + + put_device(parent); + if (ret < 0) + return ERR_PTR(ret); + + parent = child; + *node = (void *)*node + (*node)->header.length; + *len -= (*node)->header.length; + } + + if (ret == EFI_DEV_END_ENTIRE) + *len = 0; + + return child; +} diff --git a/drivers/firmware/efi/earlycon.c b/drivers/firmware/efi/earlycon.c new file mode 100644 index 000000000..a52236e11 --- /dev/null +++ b/drivers/firmware/efi/earlycon.c @@ -0,0 +1,246 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2013 Intel Corporation; author Matt Fleming + */ + +#include <linux/console.h> +#include <linux/efi.h> +#include <linux/font.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/serial_core.h> +#include <linux/screen_info.h> + +#include <asm/early_ioremap.h> + +static const struct console *earlycon_console __initdata; +static const struct font_desc *font; +static u32 efi_x, efi_y; +static u64 fb_base; +static bool fb_wb; +static void *efi_fb; + +/* + * EFI earlycon needs to use early_memremap() to map the framebuffer. + * But early_memremap() is not usable for 'earlycon=efifb keep_bootcon', + * memremap() should be used instead. memremap() will be available after + * paging_init() which is earlier than initcall callbacks. Thus adding this + * early initcall function early_efi_map_fb() to map the whole EFI framebuffer. + */ +static int __init efi_earlycon_remap_fb(void) +{ + /* bail if there is no bootconsole or it has been disabled already */ + if (!earlycon_console || !(earlycon_console->flags & CON_ENABLED)) + return 0; + + efi_fb = memremap(fb_base, screen_info.lfb_size, + fb_wb ? MEMREMAP_WB : MEMREMAP_WC); + + return efi_fb ? 0 : -ENOMEM; +} +early_initcall(efi_earlycon_remap_fb); + +static int __init efi_earlycon_unmap_fb(void) +{ + /* unmap the bootconsole fb unless keep_bootcon has left it enabled */ + if (efi_fb && !(earlycon_console->flags & CON_ENABLED)) + memunmap(efi_fb); + return 0; +} +late_initcall(efi_earlycon_unmap_fb); + +static __ref void *efi_earlycon_map(unsigned long start, unsigned long len) +{ + pgprot_t fb_prot; + + if (efi_fb) + return efi_fb + start; + + fb_prot = fb_wb ? PAGE_KERNEL : pgprot_writecombine(PAGE_KERNEL); + return early_memremap_prot(fb_base + start, len, pgprot_val(fb_prot)); +} + +static __ref void efi_earlycon_unmap(void *addr, unsigned long len) +{ + if (efi_fb) + return; + + early_memunmap(addr, len); +} + +static void efi_earlycon_clear_scanline(unsigned int y) +{ + unsigned long *dst; + u16 len; + + len = screen_info.lfb_linelength; + dst = efi_earlycon_map(y*len, len); + if (!dst) + return; + + memset(dst, 0, len); + efi_earlycon_unmap(dst, len); +} + +static void efi_earlycon_scroll_up(void) +{ + unsigned long *dst, *src; + u16 len; + u32 i, height; + + len = screen_info.lfb_linelength; + height = screen_info.lfb_height; + + for (i = 0; i < height - font->height; i++) { + dst = efi_earlycon_map(i*len, len); + if (!dst) + return; + + src = efi_earlycon_map((i + font->height) * len, len); + if (!src) { + efi_earlycon_unmap(dst, len); + return; + } + + memmove(dst, src, len); + + efi_earlycon_unmap(src, len); + efi_earlycon_unmap(dst, len); + } +} + +static void efi_earlycon_write_char(u32 *dst, unsigned char c, unsigned int h) +{ + const u32 color_black = 0x00000000; + const u32 color_white = 0x00ffffff; + const u8 *src; + int m, n, bytes; + u8 x; + + bytes = BITS_TO_BYTES(font->width); + src = font->data + c * font->height * bytes + h * bytes; + + for (m = 0; m < font->width; m++) { + n = m % 8; + x = *(src + m / 8); + if ((x >> (7 - n)) & 1) + *dst = color_white; + else + *dst = color_black; + dst++; + } +} + +static void +efi_earlycon_write(struct console *con, const char *str, unsigned int num) +{ + struct screen_info *si; + unsigned int len; + const char *s; + void *dst; + + si = &screen_info; + len = si->lfb_linelength; + + while (num) { + unsigned int linemax; + unsigned int h, count = 0; + + for (s = str; *s && *s != '\n'; s++) { + if (count == num) + break; + count++; + } + + linemax = (si->lfb_width - efi_x) / font->width; + if (count > linemax) + count = linemax; + + for (h = 0; h < font->height; h++) { + unsigned int n, x; + + dst = efi_earlycon_map((efi_y + h) * len, len); + if (!dst) + return; + + s = str; + n = count; + x = efi_x; + + while (n-- > 0) { + efi_earlycon_write_char(dst + x*4, *s, h); + x += font->width; + s++; + } + + efi_earlycon_unmap(dst, len); + } + + num -= count; + efi_x += count * font->width; + str += count; + + if (num > 0 && *s == '\n') { + efi_x = 0; + efi_y += font->height; + str++; + num--; + } + + if (efi_x + font->width > si->lfb_width) { + efi_x = 0; + efi_y += font->height; + } + + if (efi_y + font->height > si->lfb_height) { + u32 i; + + efi_y -= font->height; + efi_earlycon_scroll_up(); + + for (i = 0; i < font->height; i++) + efi_earlycon_clear_scanline(efi_y + i); + } + } +} + +static int __init efi_earlycon_setup(struct earlycon_device *device, + const char *opt) +{ + struct screen_info *si; + u16 xres, yres; + u32 i; + + if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) + return -ENODEV; + + fb_base = screen_info.lfb_base; + if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) + fb_base |= (u64)screen_info.ext_lfb_base << 32; + + fb_wb = opt && !strcmp(opt, "ram"); + + si = &screen_info; + xres = si->lfb_width; + yres = si->lfb_height; + + /* + * efi_earlycon_write_char() implicitly assumes a framebuffer with + * 32 bits per pixel. + */ + if (si->lfb_depth != 32) + return -ENODEV; + + font = get_default_font(xres, yres, -1, -1); + if (!font) + return -ENODEV; + + efi_y = rounddown(yres, font->height) - font->height; + for (i = 0; i < (yres - efi_y) / font->height; i++) + efi_earlycon_scroll_up(); + + device->con->write = efi_earlycon_write; + earlycon_console = device->con; + return 0; +} +EARLYCON_DECLARE(efifb, efi_earlycon_setup); diff --git a/drivers/firmware/efi/efi-bgrt.c b/drivers/firmware/efi/efi-bgrt.c new file mode 100644 index 000000000..6aafdb67d --- /dev/null +++ b/drivers/firmware/efi/efi-bgrt.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2012 Intel Corporation + * Author: Josh Triplett <josh@joshtriplett.org> + * + * Based on the bgrt driver: + * Copyright 2012 Red Hat, Inc <mjg@redhat.com> + * Author: Matthew Garrett + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/acpi.h> +#include <linux/efi.h> +#include <linux/efi-bgrt.h> + +struct acpi_table_bgrt bgrt_tab; +size_t bgrt_image_size; + +struct bmp_header { + u16 id; + u32 size; +} __packed; + +void __init efi_bgrt_init(struct acpi_table_header *table) +{ + void *image; + struct bmp_header bmp_header; + struct acpi_table_bgrt *bgrt = &bgrt_tab; + + if (acpi_disabled) + return; + + if (!efi_enabled(EFI_MEMMAP)) + return; + + if (table->length < sizeof(bgrt_tab)) { + pr_notice("Ignoring BGRT: invalid length %u (expected %zu)\n", + table->length, sizeof(bgrt_tab)); + return; + } + *bgrt = *(struct acpi_table_bgrt *)table; + /* + * Only version 1 is defined but some older laptops (seen on Lenovo + * Ivy Bridge models) have a correct version 1 BGRT table with the + * version set to 0, so we accept version 0 and 1. + */ + if (bgrt->version > 1) { + pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n", + bgrt->version); + goto out; + } + if (bgrt->image_type != 0) { + pr_notice("Ignoring BGRT: invalid image type %u (expected 0)\n", + bgrt->image_type); + goto out; + } + if (!bgrt->image_address) { + pr_notice("Ignoring BGRT: null image address\n"); + goto out; + } + + if (efi_mem_type(bgrt->image_address) != EFI_BOOT_SERVICES_DATA) { + pr_notice("Ignoring BGRT: invalid image address\n"); + goto out; + } + image = early_memremap(bgrt->image_address, sizeof(bmp_header)); + if (!image) { + pr_notice("Ignoring BGRT: failed to map image header memory\n"); + goto out; + } + + memcpy(&bmp_header, image, sizeof(bmp_header)); + early_memunmap(image, sizeof(bmp_header)); + if (bmp_header.id != 0x4d42) { + pr_notice("Ignoring BGRT: Incorrect BMP magic number 0x%x (expected 0x4d42)\n", + bmp_header.id); + goto out; + } + bgrt_image_size = bmp_header.size; + efi_mem_reserve(bgrt->image_address, bgrt_image_size); + + return; +out: + memset(bgrt, 0, sizeof(bgrt_tab)); +} diff --git a/drivers/firmware/efi/efi-init.c b/drivers/firmware/efi/efi-init.c new file mode 100644 index 000000000..f55a92ff1 --- /dev/null +++ b/drivers/firmware/efi/efi-init.c @@ -0,0 +1,387 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Extensible Firmware Interface + * + * Based on Extensible Firmware Interface Specification version 2.4 + * + * Copyright (C) 2013 - 2015 Linaro Ltd. + */ + +#define pr_fmt(fmt) "efi: " fmt + +#include <linux/efi.h> +#include <linux/fwnode.h> +#include <linux/init.h> +#include <linux/memblock.h> +#include <linux/mm_types.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_fdt.h> +#include <linux/platform_device.h> +#include <linux/screen_info.h> + +#include <asm/efi.h> + +static int __init is_memory(efi_memory_desc_t *md) +{ + if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC)) + return 1; + return 0; +} + +/* + * Translate a EFI virtual address into a physical address: this is necessary, + * as some data members of the EFI system table are virtually remapped after + * SetVirtualAddressMap() has been called. + */ +static phys_addr_t __init efi_to_phys(unsigned long addr) +{ + efi_memory_desc_t *md; + + for_each_efi_memory_desc(md) { + if (!(md->attribute & EFI_MEMORY_RUNTIME)) + continue; + if (md->virt_addr == 0) + /* no virtual mapping has been installed by the stub */ + break; + if (md->virt_addr <= addr && + (addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT)) + return md->phys_addr + addr - md->virt_addr; + } + return addr; +} + +static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR; +static __initdata unsigned long cpu_state_table = EFI_INVALID_TABLE_ADDR; + +static const efi_config_table_type_t arch_tables[] __initconst = { + {LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table}, + {LINUX_EFI_ARM_CPU_STATE_TABLE_GUID, &cpu_state_table}, + {} +}; + +static void __init init_screen_info(void) +{ + struct screen_info *si; + + if (IS_ENABLED(CONFIG_ARM) && + screen_info_table != EFI_INVALID_TABLE_ADDR) { + si = early_memremap_ro(screen_info_table, sizeof(*si)); + if (!si) { + pr_err("Could not map screen_info config table\n"); + return; + } + screen_info = *si; + early_memunmap(si, sizeof(*si)); + + /* dummycon on ARM needs non-zero values for columns/lines */ + screen_info.orig_video_cols = 80; + screen_info.orig_video_lines = 25; + } + + if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI && + memblock_is_map_memory(screen_info.lfb_base)) + memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size); +} + +static int __init uefi_init(u64 efi_system_table) +{ + efi_config_table_t *config_tables; + efi_system_table_t *systab; + size_t table_size; + int retval; + + systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t)); + if (systab == NULL) { + pr_warn("Unable to map EFI system table.\n"); + return -ENOMEM; + } + + set_bit(EFI_BOOT, &efi.flags); + if (IS_ENABLED(CONFIG_64BIT)) + set_bit(EFI_64BIT, &efi.flags); + + retval = efi_systab_check_header(&systab->hdr, 2); + if (retval) + goto out; + + efi.runtime = systab->runtime; + efi.runtime_version = systab->hdr.revision; + + efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor)); + + table_size = sizeof(efi_config_table_t) * systab->nr_tables; + config_tables = early_memremap_ro(efi_to_phys(systab->tables), + table_size); + if (config_tables == NULL) { + pr_warn("Unable to map EFI config table array.\n"); + retval = -ENOMEM; + goto out; + } + retval = efi_config_parse_tables(config_tables, systab->nr_tables, + IS_ENABLED(CONFIG_ARM) ? arch_tables + : NULL); + + early_memunmap(config_tables, table_size); +out: + early_memunmap(systab, sizeof(efi_system_table_t)); + return retval; +} + +/* + * Return true for regions that can be used as System RAM. + */ +static __init int is_usable_memory(efi_memory_desc_t *md) +{ + switch (md->type) { + case EFI_LOADER_CODE: + case EFI_LOADER_DATA: + case EFI_ACPI_RECLAIM_MEMORY: + case EFI_BOOT_SERVICES_CODE: + case EFI_BOOT_SERVICES_DATA: + case EFI_CONVENTIONAL_MEMORY: + case EFI_PERSISTENT_MEMORY: + /* + * Special purpose memory is 'soft reserved', which means it + * is set aside initially, but can be hotplugged back in or + * be assigned to the dax driver after boot. + */ + if (efi_soft_reserve_enabled() && + (md->attribute & EFI_MEMORY_SP)) + return false; + + /* + * According to the spec, these regions are no longer reserved + * after calling ExitBootServices(). However, we can only use + * them as System RAM if they can be mapped writeback cacheable. + */ + return (md->attribute & EFI_MEMORY_WB); + default: + break; + } + return false; +} + +static __init void reserve_regions(void) +{ + efi_memory_desc_t *md; + u64 paddr, npages, size; + + if (efi_enabled(EFI_DBG)) + pr_info("Processing EFI memory map:\n"); + + /* + * Discard memblocks discovered so far: if there are any at this + * point, they originate from memory nodes in the DT, and UEFI + * uses its own memory map instead. + */ + memblock_dump_all(); + memblock_remove(0, PHYS_ADDR_MAX); + + for_each_efi_memory_desc(md) { + paddr = md->phys_addr; + npages = md->num_pages; + + if (efi_enabled(EFI_DBG)) { + char buf[64]; + + pr_info(" 0x%012llx-0x%012llx %s\n", + paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1, + efi_md_typeattr_format(buf, sizeof(buf), md)); + } + + memrange_efi_to_native(&paddr, &npages); + size = npages << PAGE_SHIFT; + + if (is_memory(md)) { + early_init_dt_add_memory_arch(paddr, size); + + if (!is_usable_memory(md)) + memblock_mark_nomap(paddr, size); + + /* keep ACPI reclaim memory intact for kexec etc. */ + if (md->type == EFI_ACPI_RECLAIM_MEMORY) + memblock_reserve(paddr, size); + } + } +} + +void __init efi_init(void) +{ + struct efi_memory_map_data data; + u64 efi_system_table; + + /* Grab UEFI information placed in FDT by stub */ + efi_system_table = efi_get_fdt_params(&data); + if (!efi_system_table) + return; + + if (efi_memmap_init_early(&data) < 0) { + /* + * If we are booting via UEFI, the UEFI memory map is the only + * description of memory we have, so there is little point in + * proceeding if we cannot access it. + */ + panic("Unable to map EFI memory map.\n"); + } + + WARN(efi.memmap.desc_version != 1, + "Unexpected EFI_MEMORY_DESCRIPTOR version %ld", + efi.memmap.desc_version); + + if (uefi_init(efi_system_table) < 0) { + efi_memmap_unmap(); + return; + } + + reserve_regions(); + efi_esrt_init(); + efi_mokvar_table_init(); + + memblock_reserve(data.phys_map & PAGE_MASK, + PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK))); + + init_screen_info(); + +#ifdef CONFIG_ARM + /* ARM does not permit early mappings to persist across paging_init() */ + efi_memmap_unmap(); + + if (cpu_state_table != EFI_INVALID_TABLE_ADDR) { + struct efi_arm_entry_state *state; + bool dump_state = true; + + state = early_memremap_ro(cpu_state_table, + sizeof(struct efi_arm_entry_state)); + if (state == NULL) { + pr_warn("Unable to map CPU entry state table.\n"); + return; + } + + if ((state->sctlr_before_ebs & 1) == 0) + pr_warn(FW_BUG "EFI stub was entered with MMU and Dcache disabled, please fix your firmware!\n"); + else if ((state->sctlr_after_ebs & 1) == 0) + pr_warn(FW_BUG "ExitBootServices() returned with MMU and Dcache disabled, please fix your firmware!\n"); + else + dump_state = false; + + if (dump_state || efi_enabled(EFI_DBG)) { + pr_info("CPSR at EFI stub entry : 0x%08x\n", state->cpsr_before_ebs); + pr_info("SCTLR at EFI stub entry : 0x%08x\n", state->sctlr_before_ebs); + pr_info("CPSR after ExitBootServices() : 0x%08x\n", state->cpsr_after_ebs); + pr_info("SCTLR after ExitBootServices(): 0x%08x\n", state->sctlr_after_ebs); + } + early_memunmap(state, sizeof(struct efi_arm_entry_state)); + } +#endif +} + +static bool efifb_overlaps_pci_range(const struct of_pci_range *range) +{ + u64 fb_base = screen_info.lfb_base; + + if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) + fb_base |= (u64)(unsigned long)screen_info.ext_lfb_base << 32; + + return fb_base >= range->cpu_addr && + fb_base < (range->cpu_addr + range->size); +} + +static struct device_node *find_pci_overlap_node(void) +{ + struct device_node *np; + + for_each_node_by_type(np, "pci") { + struct of_pci_range_parser parser; + struct of_pci_range range; + int err; + + err = of_pci_range_parser_init(&parser, np); + if (err) { + pr_warn("of_pci_range_parser_init() failed: %d\n", err); + continue; + } + + for_each_of_pci_range(&parser, &range) + if (efifb_overlaps_pci_range(&range)) + return np; + } + return NULL; +} + +/* + * If the efifb framebuffer is backed by a PCI graphics controller, we have + * to ensure that this relation is expressed using a device link when + * running in DT mode, or the probe order may be reversed, resulting in a + * resource reservation conflict on the memory window that the efifb + * framebuffer steals from the PCIe host bridge. + */ +static int efifb_add_links(const struct fwnode_handle *fwnode, + struct device *dev) +{ + struct device_node *sup_np; + struct device *sup_dev; + + sup_np = find_pci_overlap_node(); + + /* + * If there's no PCI graphics controller backing the efifb, we are + * done here. + */ + if (!sup_np) + return 0; + + sup_dev = get_dev_from_fwnode(&sup_np->fwnode); + of_node_put(sup_np); + + /* + * Return -ENODEV if the PCI graphics controller device hasn't been + * registered yet. This ensures that efifb isn't allowed to probe + * and this function is retried again when new devices are + * registered. + */ + if (!sup_dev) + return -ENODEV; + + /* + * If this fails, retrying this function at a later point won't + * change anything. So, don't return an error after this. + */ + if (!device_link_add(dev, sup_dev, fw_devlink_get_flags())) + dev_warn(dev, "device_link_add() failed\n"); + + put_device(sup_dev); + + return 0; +} + +static const struct fwnode_operations efifb_fwnode_ops = { + .add_links = efifb_add_links, +}; + +static struct fwnode_handle efifb_fwnode = { + .ops = &efifb_fwnode_ops, +}; + +static int __init register_gop_device(void) +{ + struct platform_device *pd; + int err; + + if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) + return 0; + + pd = platform_device_alloc("efi-framebuffer", 0); + if (!pd) + return -ENOMEM; + + if (IS_ENABLED(CONFIG_PCI)) + pd->dev.fwnode = &efifb_fwnode; + + err = platform_device_add_data(pd, &screen_info, sizeof(screen_info)); + if (err) + return err; + + return platform_device_add(pd); +} +subsys_initcall(register_gop_device); diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c new file mode 100644 index 000000000..7e771c56c --- /dev/null +++ b/drivers/firmware/efi/efi-pstore.c @@ -0,0 +1,467 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <linux/efi.h> +#include <linux/module.h> +#include <linux/pstore.h> +#include <linux/slab.h> +#include <linux/ucs2_string.h> + +#define DUMP_NAME_LEN 66 + +#define EFIVARS_DATA_SIZE_MAX 1024 + +static bool efivars_pstore_disable = + IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE); + +module_param_named(pstore_disable, efivars_pstore_disable, bool, 0644); + +#define PSTORE_EFI_ATTRIBUTES \ + (EFI_VARIABLE_NON_VOLATILE | \ + EFI_VARIABLE_BOOTSERVICE_ACCESS | \ + EFI_VARIABLE_RUNTIME_ACCESS) + +static LIST_HEAD(efi_pstore_list); +static DECLARE_WORK(efivar_work, NULL); + +static int efi_pstore_open(struct pstore_info *psi) +{ + psi->data = NULL; + return 0; +} + +static int efi_pstore_close(struct pstore_info *psi) +{ + psi->data = NULL; + return 0; +} + +static inline u64 generic_id(u64 timestamp, unsigned int part, int count) +{ + return (timestamp * 100 + part) * 1000 + count; +} + +static int efi_pstore_read_func(struct efivar_entry *entry, + struct pstore_record *record) +{ + efi_guid_t vendor = LINUX_EFI_CRASH_GUID; + char name[DUMP_NAME_LEN], data_type; + int i; + int cnt; + unsigned int part; + unsigned long size; + u64 time; + + if (efi_guidcmp(entry->var.VendorGuid, vendor)) + return 0; + + for (i = 0; i < DUMP_NAME_LEN; i++) + name[i] = entry->var.VariableName[i]; + + if (sscanf(name, "dump-type%u-%u-%d-%llu-%c", + &record->type, &part, &cnt, &time, &data_type) == 5) { + record->id = generic_id(time, part, cnt); + record->part = part; + record->count = cnt; + record->time.tv_sec = time; + record->time.tv_nsec = 0; + if (data_type == 'C') + record->compressed = true; + else + record->compressed = false; + record->ecc_notice_size = 0; + } else if (sscanf(name, "dump-type%u-%u-%d-%llu", + &record->type, &part, &cnt, &time) == 4) { + record->id = generic_id(time, part, cnt); + record->part = part; + record->count = cnt; + record->time.tv_sec = time; + record->time.tv_nsec = 0; + record->compressed = false; + record->ecc_notice_size = 0; + } else if (sscanf(name, "dump-type%u-%u-%llu", + &record->type, &part, &time) == 3) { + /* + * Check if an old format, + * which doesn't support holding + * multiple logs, remains. + */ + record->id = generic_id(time, part, 0); + record->part = part; + record->count = 0; + record->time.tv_sec = time; + record->time.tv_nsec = 0; + record->compressed = false; + record->ecc_notice_size = 0; + } else + return 0; + + entry->var.DataSize = 1024; + __efivar_entry_get(entry, &entry->var.Attributes, + &entry->var.DataSize, entry->var.Data); + size = entry->var.DataSize; + memcpy(record->buf, entry->var.Data, + (size_t)min_t(unsigned long, EFIVARS_DATA_SIZE_MAX, size)); + + return size; +} + +/** + * efi_pstore_scan_sysfs_enter + * @pos: scanning entry + * @next: next entry + * @head: list head + */ +static void efi_pstore_scan_sysfs_enter(struct efivar_entry *pos, + struct efivar_entry *next, + struct list_head *head) +{ + pos->scanning = true; + if (&next->list != head) + next->scanning = true; +} + +/** + * __efi_pstore_scan_sysfs_exit + * @entry: deleting entry + * @turn_off_scanning: Check if a scanning flag should be turned off + */ +static inline int __efi_pstore_scan_sysfs_exit(struct efivar_entry *entry, + bool turn_off_scanning) +{ + if (entry->deleting) { + list_del(&entry->list); + efivar_entry_iter_end(); + kfree(entry); + if (efivar_entry_iter_begin()) + return -EINTR; + } else if (turn_off_scanning) + entry->scanning = false; + + return 0; +} + +/** + * efi_pstore_scan_sysfs_exit + * @pos: scanning entry + * @next: next entry + * @head: list head + * @stop: a flag checking if scanning will stop + */ +static int efi_pstore_scan_sysfs_exit(struct efivar_entry *pos, + struct efivar_entry *next, + struct list_head *head, bool stop) +{ + int ret = __efi_pstore_scan_sysfs_exit(pos, true); + + if (ret) + return ret; + + if (stop) + ret = __efi_pstore_scan_sysfs_exit(next, &next->list != head); + return ret; +} + +/** + * efi_pstore_sysfs_entry_iter + * + * @record: pstore record to pass to callback + * + * You MUST call efivar_entry_iter_begin() before this function, and + * efivar_entry_iter_end() afterwards. + * + */ +static int efi_pstore_sysfs_entry_iter(struct pstore_record *record) +{ + struct efivar_entry **pos = (struct efivar_entry **)&record->psi->data; + struct efivar_entry *entry, *n; + struct list_head *head = &efi_pstore_list; + int size = 0; + int ret; + + if (!*pos) { + list_for_each_entry_safe(entry, n, head, list) { + efi_pstore_scan_sysfs_enter(entry, n, head); + + size = efi_pstore_read_func(entry, record); + ret = efi_pstore_scan_sysfs_exit(entry, n, head, + size < 0); + if (ret) + return ret; + if (size) + break; + } + *pos = n; + return size; + } + + list_for_each_entry_safe_from((*pos), n, head, list) { + efi_pstore_scan_sysfs_enter((*pos), n, head); + + size = efi_pstore_read_func((*pos), record); + ret = efi_pstore_scan_sysfs_exit((*pos), n, head, size < 0); + if (ret) + return ret; + if (size) + break; + } + *pos = n; + return size; +} + +/** + * efi_pstore_read + * + * This function returns a size of NVRAM entry logged via efi_pstore_write(). + * The meaning and behavior of efi_pstore/pstore are as below. + * + * size > 0: Got data of an entry logged via efi_pstore_write() successfully, + * and pstore filesystem will continue reading subsequent entries. + * size == 0: Entry was not logged via efi_pstore_write(), + * and efi_pstore driver will continue reading subsequent entries. + * size < 0: Failed to get data of entry logging via efi_pstore_write(), + * and pstore will stop reading entry. + */ +static ssize_t efi_pstore_read(struct pstore_record *record) +{ + ssize_t size; + + record->buf = kzalloc(EFIVARS_DATA_SIZE_MAX, GFP_KERNEL); + if (!record->buf) + return -ENOMEM; + + if (efivar_entry_iter_begin()) { + size = -EINTR; + goto out; + } + size = efi_pstore_sysfs_entry_iter(record); + efivar_entry_iter_end(); + +out: + if (size <= 0) { + kfree(record->buf); + record->buf = NULL; + } + return size; +} + +static int efi_pstore_write(struct pstore_record *record) +{ + char name[DUMP_NAME_LEN]; + efi_char16_t efi_name[DUMP_NAME_LEN]; + efi_guid_t vendor = LINUX_EFI_CRASH_GUID; + int i, ret = 0; + + record->id = generic_id(record->time.tv_sec, record->part, + record->count); + + /* Since we copy the entire length of name, make sure it is wiped. */ + memset(name, 0, sizeof(name)); + + snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lld-%c", + record->type, record->part, record->count, + (long long)record->time.tv_sec, + record->compressed ? 'C' : 'D'); + + for (i = 0; i < DUMP_NAME_LEN; i++) + efi_name[i] = name[i]; + + ret = efivar_entry_set_safe(efi_name, vendor, PSTORE_EFI_ATTRIBUTES, + false, record->size, record->psi->buf); + + if (record->reason == KMSG_DUMP_OOPS && try_module_get(THIS_MODULE)) + if (!schedule_work(&efivar_work)) + module_put(THIS_MODULE); + + return ret; +}; + +/* + * Clean up an entry with the same name + */ +static int efi_pstore_erase_func(struct efivar_entry *entry, void *data) +{ + efi_char16_t *efi_name = data; + efi_guid_t vendor = LINUX_EFI_CRASH_GUID; + unsigned long ucs2_len = ucs2_strlen(efi_name); + + if (efi_guidcmp(entry->var.VendorGuid, vendor)) + return 0; + + if (ucs2_strncmp(entry->var.VariableName, efi_name, (size_t)ucs2_len)) + return 0; + + if (entry->scanning) { + /* + * Skip deletion because this entry will be deleted + * after scanning is completed. + */ + entry->deleting = true; + } else + list_del(&entry->list); + + /* found */ + __efivar_entry_delete(entry); + + return 1; +} + +static int efi_pstore_erase_name(const char *name) +{ + struct efivar_entry *entry = NULL; + efi_char16_t efi_name[DUMP_NAME_LEN]; + int found, i; + + for (i = 0; i < DUMP_NAME_LEN; i++) { + efi_name[i] = name[i]; + if (name[i] == '\0') + break; + } + + if (efivar_entry_iter_begin()) + return -EINTR; + + found = __efivar_entry_iter(efi_pstore_erase_func, &efi_pstore_list, + efi_name, &entry); + efivar_entry_iter_end(); + + if (found && !entry->scanning) + kfree(entry); + + return found ? 0 : -ENOENT; +} + +static int efi_pstore_erase(struct pstore_record *record) +{ + char name[DUMP_NAME_LEN]; + int ret; + + snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lld", + record->type, record->part, record->count, + (long long)record->time.tv_sec); + ret = efi_pstore_erase_name(name); + if (ret != -ENOENT) + return ret; + + snprintf(name, sizeof(name), "dump-type%u-%u-%lld", + record->type, record->part, (long long)record->time.tv_sec); + ret = efi_pstore_erase_name(name); + + return ret; +} + +static struct pstore_info efi_pstore_info = { + .owner = THIS_MODULE, + .name = "efi", + .flags = PSTORE_FLAGS_DMESG, + .open = efi_pstore_open, + .close = efi_pstore_close, + .read = efi_pstore_read, + .write = efi_pstore_write, + .erase = efi_pstore_erase, +}; + +static int efi_pstore_callback(efi_char16_t *name, efi_guid_t vendor, + unsigned long name_size, void *data) +{ + struct efivar_entry *entry; + int ret; + + entry = kzalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) + return -ENOMEM; + + memcpy(entry->var.VariableName, name, name_size); + entry->var.VendorGuid = vendor; + + ret = efivar_entry_add(entry, &efi_pstore_list); + if (ret) + kfree(entry); + + return ret; +} + +static int efi_pstore_update_entry(efi_char16_t *name, efi_guid_t vendor, + unsigned long name_size, void *data) +{ + struct efivar_entry *entry = data; + + if (efivar_entry_find(name, vendor, &efi_pstore_list, false)) + return 0; + + memcpy(entry->var.VariableName, name, name_size); + memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t)); + + return 1; +} + +static void efi_pstore_update_entries(struct work_struct *work) +{ + struct efivar_entry *entry; + int err; + + /* Add new sysfs entries */ + while (1) { + entry = kzalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) + return; + + err = efivar_init(efi_pstore_update_entry, entry, + false, &efi_pstore_list); + if (!err) + break; + + efivar_entry_add(entry, &efi_pstore_list); + } + + kfree(entry); + module_put(THIS_MODULE); +} + +static __init int efivars_pstore_init(void) +{ + int ret; + + if (!efivars_kobject() || !efivar_supports_writes()) + return 0; + + if (efivars_pstore_disable) + return 0; + + ret = efivar_init(efi_pstore_callback, NULL, true, &efi_pstore_list); + if (ret) + return ret; + + efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL); + if (!efi_pstore_info.buf) + return -ENOMEM; + + efi_pstore_info.bufsize = 1024; + + if (pstore_register(&efi_pstore_info)) { + kfree(efi_pstore_info.buf); + efi_pstore_info.buf = NULL; + efi_pstore_info.bufsize = 0; + } + + INIT_WORK(&efivar_work, efi_pstore_update_entries); + + return 0; +} + +static __exit void efivars_pstore_exit(void) +{ + if (!efi_pstore_info.bufsize) + return; + + pstore_unregister(&efi_pstore_info); + kfree(efi_pstore_info.buf); + efi_pstore_info.buf = NULL; + efi_pstore_info.bufsize = 0; +} + +module_init(efivars_pstore_init); +module_exit(efivars_pstore_exit); + +MODULE_DESCRIPTION("EFI variable backend for pstore"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:efivars"); diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c new file mode 100644 index 000000000..332739f3e --- /dev/null +++ b/drivers/firmware/efi/efi.c @@ -0,0 +1,1049 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * efi.c - EFI subsystem + * + * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> + * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> + * Copyright (C) 2013 Tom Gundersen <teg@jklm.no> + * + * This code registers /sys/firmware/efi{,/efivars} when EFI is supported, + * allowing the efivarfs to be mounted or the efivars module to be loaded. + * The existance of /sys/firmware/efi may also be used by userspace to + * determine that the system supports EFI. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kobject.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/efi.h> +#include <linux/of.h> +#include <linux/io.h> +#include <linux/kexec.h> +#include <linux/platform_device.h> +#include <linux/random.h> +#include <linux/reboot.h> +#include <linux/slab.h> +#include <linux/acpi.h> +#include <linux/ucs2_string.h> +#include <linux/memblock.h> +#include <linux/security.h> + +#include <asm/early_ioremap.h> + +struct efi __read_mostly efi = { + .runtime_supported_mask = EFI_RT_SUPPORTED_ALL, + .acpi = EFI_INVALID_TABLE_ADDR, + .acpi20 = EFI_INVALID_TABLE_ADDR, + .smbios = EFI_INVALID_TABLE_ADDR, + .smbios3 = EFI_INVALID_TABLE_ADDR, + .esrt = EFI_INVALID_TABLE_ADDR, + .tpm_log = EFI_INVALID_TABLE_ADDR, + .tpm_final_log = EFI_INVALID_TABLE_ADDR, +#ifdef CONFIG_LOAD_UEFI_KEYS + .mokvar_table = EFI_INVALID_TABLE_ADDR, +#endif +}; +EXPORT_SYMBOL(efi); + +unsigned long __ro_after_init efi_rng_seed = EFI_INVALID_TABLE_ADDR; +static unsigned long __initdata mem_reserve = EFI_INVALID_TABLE_ADDR; +static unsigned long __initdata rt_prop = EFI_INVALID_TABLE_ADDR; + +struct mm_struct efi_mm = { + .mm_rb = RB_ROOT, + .mm_users = ATOMIC_INIT(2), + .mm_count = ATOMIC_INIT(1), + .write_protect_seq = SEQCNT_ZERO(efi_mm.write_protect_seq), + MMAP_LOCK_INITIALIZER(efi_mm) + .page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock), + .mmlist = LIST_HEAD_INIT(efi_mm.mmlist), + .cpu_bitmap = { [BITS_TO_LONGS(NR_CPUS)] = 0}, +}; + +struct workqueue_struct *efi_rts_wq; + +static bool disable_runtime; +static int __init setup_noefi(char *arg) +{ + disable_runtime = true; + return 0; +} +early_param("noefi", setup_noefi); + +bool efi_runtime_disabled(void) +{ + return disable_runtime; +} + +bool __pure __efi_soft_reserve_enabled(void) +{ + return !efi_enabled(EFI_MEM_NO_SOFT_RESERVE); +} + +static int __init parse_efi_cmdline(char *str) +{ + if (!str) { + pr_warn("need at least one option\n"); + return -EINVAL; + } + + if (parse_option_str(str, "debug")) + set_bit(EFI_DBG, &efi.flags); + + if (parse_option_str(str, "noruntime")) + disable_runtime = true; + + if (parse_option_str(str, "nosoftreserve")) + set_bit(EFI_MEM_NO_SOFT_RESERVE, &efi.flags); + + return 0; +} +early_param("efi", parse_efi_cmdline); + +struct kobject *efi_kobj; + +/* + * Let's not leave out systab information that snuck into + * the efivars driver + * Note, do not add more fields in systab sysfs file as it breaks sysfs + * one value per file rule! + */ +static ssize_t systab_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + char *str = buf; + + if (!kobj || !buf) + return -EINVAL; + + if (efi.acpi20 != EFI_INVALID_TABLE_ADDR) + str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20); + if (efi.acpi != EFI_INVALID_TABLE_ADDR) + str += sprintf(str, "ACPI=0x%lx\n", efi.acpi); + /* + * If both SMBIOS and SMBIOS3 entry points are implemented, the + * SMBIOS3 entry point shall be preferred, so we list it first to + * let applications stop parsing after the first match. + */ + if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) + str += sprintf(str, "SMBIOS3=0x%lx\n", efi.smbios3); + if (efi.smbios != EFI_INVALID_TABLE_ADDR) + str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios); + + if (IS_ENABLED(CONFIG_IA64) || IS_ENABLED(CONFIG_X86)) + str = efi_systab_show_arch(str); + + return str - buf; +} + +static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400); + +static ssize_t fw_platform_size_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", efi_enabled(EFI_64BIT) ? 64 : 32); +} + +extern __weak struct kobj_attribute efi_attr_fw_vendor; +extern __weak struct kobj_attribute efi_attr_runtime; +extern __weak struct kobj_attribute efi_attr_config_table; +static struct kobj_attribute efi_attr_fw_platform_size = + __ATTR_RO(fw_platform_size); + +static struct attribute *efi_subsys_attrs[] = { + &efi_attr_systab.attr, + &efi_attr_fw_platform_size.attr, + &efi_attr_fw_vendor.attr, + &efi_attr_runtime.attr, + &efi_attr_config_table.attr, + NULL, +}; + +umode_t __weak efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, + int n) +{ + return attr->mode; +} + +static const struct attribute_group efi_subsys_attr_group = { + .attrs = efi_subsys_attrs, + .is_visible = efi_attr_is_visible, +}; + +static struct efivars generic_efivars; +static struct efivar_operations generic_ops; + +static int generic_ops_register(void) +{ + generic_ops.get_variable = efi.get_variable; + generic_ops.get_next_variable = efi.get_next_variable; + generic_ops.query_variable_store = efi_query_variable_store; + + if (efi_rt_services_supported(EFI_RT_SUPPORTED_SET_VARIABLE)) { + generic_ops.set_variable = efi.set_variable; + generic_ops.set_variable_nonblocking = efi.set_variable_nonblocking; + } + return efivars_register(&generic_efivars, &generic_ops, efi_kobj); +} + +static void generic_ops_unregister(void) +{ + efivars_unregister(&generic_efivars); +} + +#ifdef CONFIG_EFI_CUSTOM_SSDT_OVERLAYS +#define EFIVAR_SSDT_NAME_MAX 16 +static char efivar_ssdt[EFIVAR_SSDT_NAME_MAX] __initdata; +static int __init efivar_ssdt_setup(char *str) +{ + int ret = security_locked_down(LOCKDOWN_ACPI_TABLES); + + if (ret) + return ret; + + if (strlen(str) < sizeof(efivar_ssdt)) + memcpy(efivar_ssdt, str, strlen(str)); + else + pr_warn("efivar_ssdt: name too long: %s\n", str); + return 1; +} +__setup("efivar_ssdt=", efivar_ssdt_setup); + +static __init int efivar_ssdt_iter(efi_char16_t *name, efi_guid_t vendor, + unsigned long name_size, void *data) +{ + struct efivar_entry *entry; + struct list_head *list = data; + char utf8_name[EFIVAR_SSDT_NAME_MAX]; + int limit = min_t(unsigned long, EFIVAR_SSDT_NAME_MAX, name_size); + + ucs2_as_utf8(utf8_name, name, limit - 1); + if (strncmp(utf8_name, efivar_ssdt, limit) != 0) + return 0; + + entry = kmalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) + return 0; + + memcpy(entry->var.VariableName, name, name_size); + memcpy(&entry->var.VendorGuid, &vendor, sizeof(efi_guid_t)); + + efivar_entry_add(entry, list); + + return 0; +} + +static __init int efivar_ssdt_load(void) +{ + LIST_HEAD(entries); + struct efivar_entry *entry, *aux; + unsigned long size; + void *data; + int ret; + + if (!efivar_ssdt[0]) + return 0; + + ret = efivar_init(efivar_ssdt_iter, &entries, true, &entries); + + list_for_each_entry_safe(entry, aux, &entries, list) { + pr_info("loading SSDT from variable %s-%pUl\n", efivar_ssdt, + &entry->var.VendorGuid); + + list_del(&entry->list); + + ret = efivar_entry_size(entry, &size); + if (ret) { + pr_err("failed to get var size\n"); + goto free_entry; + } + + data = kmalloc(size, GFP_KERNEL); + if (!data) { + ret = -ENOMEM; + goto free_entry; + } + + ret = efivar_entry_get(entry, NULL, &size, data); + if (ret) { + pr_err("failed to get var data\n"); + goto free_data; + } + + ret = acpi_load_table(data, NULL); + if (ret) { + pr_err("failed to load table: %d\n", ret); + goto free_data; + } + + goto free_entry; + +free_data: + kfree(data); + +free_entry: + kfree(entry); + } + + return ret; +} +#else +static inline int efivar_ssdt_load(void) { return 0; } +#endif + +#ifdef CONFIG_DEBUG_FS + +#define EFI_DEBUGFS_MAX_BLOBS 32 + +static struct debugfs_blob_wrapper debugfs_blob[EFI_DEBUGFS_MAX_BLOBS]; + +static void __init efi_debugfs_init(void) +{ + struct dentry *efi_debugfs; + efi_memory_desc_t *md; + char name[32]; + int type_count[EFI_BOOT_SERVICES_DATA + 1] = {}; + int i = 0; + + efi_debugfs = debugfs_create_dir("efi", NULL); + if (IS_ERR_OR_NULL(efi_debugfs)) + return; + + for_each_efi_memory_desc(md) { + switch (md->type) { + case EFI_BOOT_SERVICES_CODE: + snprintf(name, sizeof(name), "boot_services_code%d", + type_count[md->type]++); + break; + case EFI_BOOT_SERVICES_DATA: + snprintf(name, sizeof(name), "boot_services_data%d", + type_count[md->type]++); + break; + default: + continue; + } + + if (i >= EFI_DEBUGFS_MAX_BLOBS) { + pr_warn("More then %d EFI boot service segments, only showing first %d in debugfs\n", + EFI_DEBUGFS_MAX_BLOBS, EFI_DEBUGFS_MAX_BLOBS); + break; + } + + debugfs_blob[i].size = md->num_pages << EFI_PAGE_SHIFT; + debugfs_blob[i].data = memremap(md->phys_addr, + debugfs_blob[i].size, + MEMREMAP_WB); + if (!debugfs_blob[i].data) + continue; + + debugfs_create_blob(name, 0400, efi_debugfs, &debugfs_blob[i]); + i++; + } +} +#else +static inline void efi_debugfs_init(void) {} +#endif + +/* + * We register the efi subsystem with the firmware subsystem and the + * efivars subsystem with the efi subsystem, if the system was booted with + * EFI. + */ +static int __init efisubsys_init(void) +{ + int error; + + if (!efi_enabled(EFI_RUNTIME_SERVICES)) + efi.runtime_supported_mask = 0; + + if (!efi_enabled(EFI_BOOT)) + return 0; + + if (efi.runtime_supported_mask) { + /* + * Since we process only one efi_runtime_service() at a time, an + * ordered workqueue (which creates only one execution context) + * should suffice for all our needs. + */ + efi_rts_wq = alloc_ordered_workqueue("efi_rts_wq", 0); + if (!efi_rts_wq) { + pr_err("Creating efi_rts_wq failed, EFI runtime services disabled.\n"); + clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); + efi.runtime_supported_mask = 0; + return 0; + } + } + + if (efi_rt_services_supported(EFI_RT_SUPPORTED_TIME_SERVICES)) + platform_device_register_simple("rtc-efi", 0, NULL, 0); + + /* We register the efi directory at /sys/firmware/efi */ + efi_kobj = kobject_create_and_add("efi", firmware_kobj); + if (!efi_kobj) { + pr_err("efi: Firmware registration failed.\n"); + error = -ENOMEM; + goto err_destroy_wq; + } + + if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE | + EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) { + error = generic_ops_register(); + if (error) + goto err_put; + efivar_ssdt_load(); + platform_device_register_simple("efivars", 0, NULL, 0); + } + + error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group); + if (error) { + pr_err("efi: Sysfs attribute export failed with error %d.\n", + error); + goto err_unregister; + } + + error = efi_runtime_map_init(efi_kobj); + if (error) + goto err_remove_group; + + /* and the standard mountpoint for efivarfs */ + error = sysfs_create_mount_point(efi_kobj, "efivars"); + if (error) { + pr_err("efivars: Subsystem registration failed.\n"); + goto err_remove_group; + } + + if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS)) + efi_debugfs_init(); + + return 0; + +err_remove_group: + sysfs_remove_group(efi_kobj, &efi_subsys_attr_group); +err_unregister: + if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE | + EFI_RT_SUPPORTED_GET_NEXT_VARIABLE_NAME)) + generic_ops_unregister(); +err_put: + kobject_put(efi_kobj); +err_destroy_wq: + if (efi_rts_wq) + destroy_workqueue(efi_rts_wq); + + return error; +} + +subsys_initcall(efisubsys_init); + +/* + * Find the efi memory descriptor for a given physical address. Given a + * physical address, determine if it exists within an EFI Memory Map entry, + * and if so, populate the supplied memory descriptor with the appropriate + * data. + */ +int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md) +{ + efi_memory_desc_t *md; + + if (!efi_enabled(EFI_MEMMAP)) { + pr_err_once("EFI_MEMMAP is not enabled.\n"); + return -EINVAL; + } + + if (!out_md) { + pr_err_once("out_md is null.\n"); + return -EINVAL; + } + + for_each_efi_memory_desc(md) { + u64 size; + u64 end; + + size = md->num_pages << EFI_PAGE_SHIFT; + end = md->phys_addr + size; + if (phys_addr >= md->phys_addr && phys_addr < end) { + memcpy(out_md, md, sizeof(*out_md)); + return 0; + } + } + return -ENOENT; +} + +/* + * Calculate the highest address of an efi memory descriptor. + */ +u64 __init efi_mem_desc_end(efi_memory_desc_t *md) +{ + u64 size = md->num_pages << EFI_PAGE_SHIFT; + u64 end = md->phys_addr + size; + return end; +} + +void __init __weak efi_arch_mem_reserve(phys_addr_t addr, u64 size) {} + +/** + * efi_mem_reserve - Reserve an EFI memory region + * @addr: Physical address to reserve + * @size: Size of reservation + * + * Mark a region as reserved from general kernel allocation and + * prevent it being released by efi_free_boot_services(). + * + * This function should be called drivers once they've parsed EFI + * configuration tables to figure out where their data lives, e.g. + * efi_esrt_init(). + */ +void __init efi_mem_reserve(phys_addr_t addr, u64 size) +{ + if (!memblock_is_region_reserved(addr, size)) + memblock_reserve(addr, size); + + /* + * Some architectures (x86) reserve all boot services ranges + * until efi_free_boot_services() because of buggy firmware + * implementations. This means the above memblock_reserve() is + * superfluous on x86 and instead what it needs to do is + * ensure the @start, @size is not freed. + */ + efi_arch_mem_reserve(addr, size); +} + +static const efi_config_table_type_t common_tables[] __initconst = { + {ACPI_20_TABLE_GUID, &efi.acpi20, "ACPI 2.0" }, + {ACPI_TABLE_GUID, &efi.acpi, "ACPI" }, + {SMBIOS_TABLE_GUID, &efi.smbios, "SMBIOS" }, + {SMBIOS3_TABLE_GUID, &efi.smbios3, "SMBIOS 3.0" }, + {EFI_SYSTEM_RESOURCE_TABLE_GUID, &efi.esrt, "ESRT" }, + {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, &efi_mem_attr_table, "MEMATTR" }, + {LINUX_EFI_RANDOM_SEED_TABLE_GUID, &efi_rng_seed, "RNG" }, + {LINUX_EFI_TPM_EVENT_LOG_GUID, &efi.tpm_log, "TPMEventLog" }, + {LINUX_EFI_TPM_FINAL_LOG_GUID, &efi.tpm_final_log, "TPMFinalLog" }, + {LINUX_EFI_MEMRESERVE_TABLE_GUID, &mem_reserve, "MEMRESERVE" }, + {EFI_RT_PROPERTIES_TABLE_GUID, &rt_prop, "RTPROP" }, +#ifdef CONFIG_EFI_RCI2_TABLE + {DELLEMC_EFI_RCI2_TABLE_GUID, &rci2_table_phys }, +#endif +#ifdef CONFIG_LOAD_UEFI_KEYS + {LINUX_EFI_MOK_VARIABLE_TABLE_GUID, &efi.mokvar_table, "MOKvar" }, +#endif + {}, +}; + +static __init int match_config_table(const efi_guid_t *guid, + unsigned long table, + const efi_config_table_type_t *table_types) +{ + int i; + + for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) { + if (!efi_guidcmp(*guid, table_types[i].guid)) { + *(table_types[i].ptr) = table; + if (table_types[i].name[0]) + pr_cont("%s=0x%lx ", + table_types[i].name, table); + return 1; + } + } + + return 0; +} + +int __init efi_config_parse_tables(const efi_config_table_t *config_tables, + int count, + const efi_config_table_type_t *arch_tables) +{ + const efi_config_table_64_t *tbl64 = (void *)config_tables; + const efi_config_table_32_t *tbl32 = (void *)config_tables; + const efi_guid_t *guid; + unsigned long table; + int i; + + pr_info(""); + for (i = 0; i < count; i++) { + if (!IS_ENABLED(CONFIG_X86)) { + guid = &config_tables[i].guid; + table = (unsigned long)config_tables[i].table; + } else if (efi_enabled(EFI_64BIT)) { + guid = &tbl64[i].guid; + table = tbl64[i].table; + + if (IS_ENABLED(CONFIG_X86_32) && + tbl64[i].table > U32_MAX) { + pr_cont("\n"); + pr_err("Table located above 4GB, disabling EFI.\n"); + return -EINVAL; + } + } else { + guid = &tbl32[i].guid; + table = tbl32[i].table; + } + + if (!match_config_table(guid, table, common_tables) && arch_tables) + match_config_table(guid, table, arch_tables); + } + pr_cont("\n"); + set_bit(EFI_CONFIG_TABLES, &efi.flags); + + if (efi_rng_seed != EFI_INVALID_TABLE_ADDR) { + struct linux_efi_random_seed *seed; + u32 size = 0; + + seed = early_memremap(efi_rng_seed, sizeof(*seed)); + if (seed != NULL) { + size = min_t(u32, seed->size, SZ_1K); // sanity check + early_memunmap(seed, sizeof(*seed)); + } else { + pr_err("Could not map UEFI random seed!\n"); + } + if (size > 0) { + seed = early_memremap(efi_rng_seed, + sizeof(*seed) + size); + if (seed != NULL) { + add_bootloader_randomness(seed->bits, size); + memzero_explicit(seed->bits, size); + early_memunmap(seed, sizeof(*seed) + size); + } else { + pr_err("Could not map UEFI random seed!\n"); + } + } + } + + if (!IS_ENABLED(CONFIG_X86_32) && efi_enabled(EFI_MEMMAP)) + efi_memattr_init(); + + efi_tpm_eventlog_init(); + + if (mem_reserve != EFI_INVALID_TABLE_ADDR) { + unsigned long prsv = mem_reserve; + + while (prsv) { + struct linux_efi_memreserve *rsv; + u8 *p; + + /* + * Just map a full page: that is what we will get + * anyway, and it permits us to map the entire entry + * before knowing its size. + */ + p = early_memremap(ALIGN_DOWN(prsv, PAGE_SIZE), + PAGE_SIZE); + if (p == NULL) { + pr_err("Could not map UEFI memreserve entry!\n"); + return -ENOMEM; + } + + rsv = (void *)(p + prsv % PAGE_SIZE); + + /* reserve the entry itself */ + memblock_reserve(prsv, + struct_size(rsv, entry, rsv->size)); + + for (i = 0; i < atomic_read(&rsv->count); i++) { + memblock_reserve(rsv->entry[i].base, + rsv->entry[i].size); + } + + prsv = rsv->next; + early_memunmap(p, PAGE_SIZE); + } + } + + if (rt_prop != EFI_INVALID_TABLE_ADDR) { + efi_rt_properties_table_t *tbl; + + tbl = early_memremap(rt_prop, sizeof(*tbl)); + if (tbl) { + efi.runtime_supported_mask &= tbl->runtime_services_supported; + early_memunmap(tbl, sizeof(*tbl)); + } + } + + return 0; +} + +int __init efi_systab_check_header(const efi_table_hdr_t *systab_hdr, + int min_major_version) +{ + if (systab_hdr->signature != EFI_SYSTEM_TABLE_SIGNATURE) { + pr_err("System table signature incorrect!\n"); + return -EINVAL; + } + + if ((systab_hdr->revision >> 16) < min_major_version) + pr_err("Warning: System table version %d.%02d, expected %d.00 or greater!\n", + systab_hdr->revision >> 16, + systab_hdr->revision & 0xffff, + min_major_version); + + return 0; +} + +#ifndef CONFIG_IA64 +static const efi_char16_t *__init map_fw_vendor(unsigned long fw_vendor, + size_t size) +{ + const efi_char16_t *ret; + + ret = early_memremap_ro(fw_vendor, size); + if (!ret) + pr_err("Could not map the firmware vendor!\n"); + return ret; +} + +static void __init unmap_fw_vendor(const void *fw_vendor, size_t size) +{ + early_memunmap((void *)fw_vendor, size); +} +#else +#define map_fw_vendor(p, s) __va(p) +#define unmap_fw_vendor(v, s) +#endif + +void __init efi_systab_report_header(const efi_table_hdr_t *systab_hdr, + unsigned long fw_vendor) +{ + char vendor[100] = "unknown"; + const efi_char16_t *c16; + size_t i; + + c16 = map_fw_vendor(fw_vendor, sizeof(vendor) * sizeof(efi_char16_t)); + if (c16) { + for (i = 0; i < sizeof(vendor) - 1 && c16[i]; ++i) + vendor[i] = c16[i]; + vendor[i] = '\0'; + + unmap_fw_vendor(c16, sizeof(vendor) * sizeof(efi_char16_t)); + } + + pr_info("EFI v%u.%.02u by %s\n", + systab_hdr->revision >> 16, + systab_hdr->revision & 0xffff, + vendor); + + if (IS_ENABLED(CONFIG_X86_64) && + systab_hdr->revision > EFI_1_10_SYSTEM_TABLE_REVISION && + !strcmp(vendor, "Apple")) { + pr_info("Apple Mac detected, using EFI v1.10 runtime services only\n"); + efi.runtime_version = EFI_1_10_SYSTEM_TABLE_REVISION; + } +} + +static __initdata char memory_type_name[][13] = { + "Reserved", + "Loader Code", + "Loader Data", + "Boot Code", + "Boot Data", + "Runtime Code", + "Runtime Data", + "Conventional", + "Unusable", + "ACPI Reclaim", + "ACPI Mem NVS", + "MMIO", + "MMIO Port", + "PAL Code", + "Persistent", +}; + +char * __init efi_md_typeattr_format(char *buf, size_t size, + const efi_memory_desc_t *md) +{ + char *pos; + int type_len; + u64 attr; + + pos = buf; + if (md->type >= ARRAY_SIZE(memory_type_name)) + type_len = snprintf(pos, size, "[type=%u", md->type); + else + type_len = snprintf(pos, size, "[%-*s", + (int)(sizeof(memory_type_name[0]) - 1), + memory_type_name[md->type]); + if (type_len >= size) + return buf; + + pos += type_len; + size -= type_len; + + attr = md->attribute; + if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT | + EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO | + EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP | + EFI_MEMORY_NV | EFI_MEMORY_SP | EFI_MEMORY_CPU_CRYPTO | + EFI_MEMORY_RUNTIME | EFI_MEMORY_MORE_RELIABLE)) + snprintf(pos, size, "|attr=0x%016llx]", + (unsigned long long)attr); + else + snprintf(pos, size, + "|%3s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]", + attr & EFI_MEMORY_RUNTIME ? "RUN" : "", + attr & EFI_MEMORY_MORE_RELIABLE ? "MR" : "", + attr & EFI_MEMORY_CPU_CRYPTO ? "CC" : "", + attr & EFI_MEMORY_SP ? "SP" : "", + attr & EFI_MEMORY_NV ? "NV" : "", + attr & EFI_MEMORY_XP ? "XP" : "", + attr & EFI_MEMORY_RP ? "RP" : "", + attr & EFI_MEMORY_WP ? "WP" : "", + attr & EFI_MEMORY_RO ? "RO" : "", + attr & EFI_MEMORY_UCE ? "UCE" : "", + attr & EFI_MEMORY_WB ? "WB" : "", + attr & EFI_MEMORY_WT ? "WT" : "", + attr & EFI_MEMORY_WC ? "WC" : "", + attr & EFI_MEMORY_UC ? "UC" : ""); + return buf; +} + +/* + * IA64 has a funky EFI memory map that doesn't work the same way as + * other architectures. + */ +#ifndef CONFIG_IA64 +/* + * efi_mem_attributes - lookup memmap attributes for physical address + * @phys_addr: the physical address to lookup + * + * Search in the EFI memory map for the region covering + * @phys_addr. Returns the EFI memory attributes if the region + * was found in the memory map, 0 otherwise. + */ +u64 efi_mem_attributes(unsigned long phys_addr) +{ + efi_memory_desc_t *md; + + if (!efi_enabled(EFI_MEMMAP)) + return 0; + + for_each_efi_memory_desc(md) { + if ((md->phys_addr <= phys_addr) && + (phys_addr < (md->phys_addr + + (md->num_pages << EFI_PAGE_SHIFT)))) + return md->attribute; + } + return 0; +} + +/* + * efi_mem_type - lookup memmap type for physical address + * @phys_addr: the physical address to lookup + * + * Search in the EFI memory map for the region covering @phys_addr. + * Returns the EFI memory type if the region was found in the memory + * map, -EINVAL otherwise. + */ +int efi_mem_type(unsigned long phys_addr) +{ + const efi_memory_desc_t *md; + + if (!efi_enabled(EFI_MEMMAP)) + return -ENOTSUPP; + + for_each_efi_memory_desc(md) { + if ((md->phys_addr <= phys_addr) && + (phys_addr < (md->phys_addr + + (md->num_pages << EFI_PAGE_SHIFT)))) + return md->type; + } + return -EINVAL; +} +#endif + +int efi_status_to_err(efi_status_t status) +{ + int err; + + switch (status) { + case EFI_SUCCESS: + err = 0; + break; + case EFI_INVALID_PARAMETER: + err = -EINVAL; + break; + case EFI_OUT_OF_RESOURCES: + err = -ENOSPC; + break; + case EFI_DEVICE_ERROR: + err = -EIO; + break; + case EFI_WRITE_PROTECTED: + err = -EROFS; + break; + case EFI_SECURITY_VIOLATION: + err = -EACCES; + break; + case EFI_NOT_FOUND: + err = -ENOENT; + break; + case EFI_ABORTED: + err = -EINTR; + break; + default: + err = -EINVAL; + } + + return err; +} + +static DEFINE_SPINLOCK(efi_mem_reserve_persistent_lock); +static struct linux_efi_memreserve *efi_memreserve_root __ro_after_init; + +static int __init efi_memreserve_map_root(void) +{ + if (mem_reserve == EFI_INVALID_TABLE_ADDR) + return -ENODEV; + + efi_memreserve_root = memremap(mem_reserve, + sizeof(*efi_memreserve_root), + MEMREMAP_WB); + if (WARN_ON_ONCE(!efi_memreserve_root)) + return -ENOMEM; + return 0; +} + +static int efi_mem_reserve_iomem(phys_addr_t addr, u64 size) +{ + struct resource *res, *parent; + int ret; + + res = kzalloc(sizeof(struct resource), GFP_ATOMIC); + if (!res) + return -ENOMEM; + + res->name = "reserved"; + res->flags = IORESOURCE_MEM; + res->start = addr; + res->end = addr + size - 1; + + /* we expect a conflict with a 'System RAM' region */ + parent = request_resource_conflict(&iomem_resource, res); + ret = parent ? request_resource(parent, res) : 0; + + /* + * Given that efi_mem_reserve_iomem() can be called at any + * time, only call memblock_reserve() if the architecture + * keeps the infrastructure around. + */ + if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK) && !ret) + memblock_reserve(addr, size); + + return ret; +} + +int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size) +{ + struct linux_efi_memreserve *rsv; + unsigned long prsv; + int rc, index; + + if (efi_memreserve_root == (void *)ULONG_MAX) + return -ENODEV; + + if (!efi_memreserve_root) { + rc = efi_memreserve_map_root(); + if (rc) + return rc; + } + + /* first try to find a slot in an existing linked list entry */ + for (prsv = efi_memreserve_root->next; prsv; ) { + rsv = memremap(prsv, sizeof(*rsv), MEMREMAP_WB); + if (!rsv) + return -ENOMEM; + index = atomic_fetch_add_unless(&rsv->count, 1, rsv->size); + if (index < rsv->size) { + rsv->entry[index].base = addr; + rsv->entry[index].size = size; + + memunmap(rsv); + return efi_mem_reserve_iomem(addr, size); + } + prsv = rsv->next; + memunmap(rsv); + } + + /* no slot found - allocate a new linked list entry */ + rsv = (struct linux_efi_memreserve *)__get_free_page(GFP_ATOMIC); + if (!rsv) + return -ENOMEM; + + rc = efi_mem_reserve_iomem(__pa(rsv), SZ_4K); + if (rc) { + free_page((unsigned long)rsv); + return rc; + } + + /* + * The memremap() call above assumes that a linux_efi_memreserve entry + * never crosses a page boundary, so let's ensure that this remains true + * even when kexec'ing a 4k pages kernel from a >4k pages kernel, by + * using SZ_4K explicitly in the size calculation below. + */ + rsv->size = EFI_MEMRESERVE_COUNT(SZ_4K); + atomic_set(&rsv->count, 1); + rsv->entry[0].base = addr; + rsv->entry[0].size = size; + + spin_lock(&efi_mem_reserve_persistent_lock); + rsv->next = efi_memreserve_root->next; + efi_memreserve_root->next = __pa(rsv); + spin_unlock(&efi_mem_reserve_persistent_lock); + + return efi_mem_reserve_iomem(addr, size); +} + +static int __init efi_memreserve_root_init(void) +{ + if (efi_memreserve_root) + return 0; + if (efi_memreserve_map_root()) + efi_memreserve_root = (void *)ULONG_MAX; + return 0; +} +early_initcall(efi_memreserve_root_init); + +#ifdef CONFIG_KEXEC +static int update_efi_random_seed(struct notifier_block *nb, + unsigned long code, void *unused) +{ + struct linux_efi_random_seed *seed; + u32 size = 0; + + if (!kexec_in_progress) + return NOTIFY_DONE; + + seed = memremap(efi_rng_seed, sizeof(*seed), MEMREMAP_WB); + if (seed != NULL) { + size = min(seed->size, EFI_RANDOM_SEED_SIZE); + memunmap(seed); + } else { + pr_err("Could not map UEFI random seed!\n"); + } + if (size > 0) { + seed = memremap(efi_rng_seed, sizeof(*seed) + size, + MEMREMAP_WB); + if (seed != NULL) { + seed->size = size; + get_random_bytes(seed->bits, seed->size); + memunmap(seed); + } else { + pr_err("Could not map UEFI random seed!\n"); + } + } + return NOTIFY_DONE; +} + +static struct notifier_block efi_random_seed_nb = { + .notifier_call = update_efi_random_seed, +}; + +static int __init register_update_efi_random_seed(void) +{ + if (efi_rng_seed == EFI_INVALID_TABLE_ADDR) + return 0; + return register_reboot_notifier(&efi_random_seed_nb); +} +late_initcall(register_update_efi_random_seed); +#endif diff --git a/drivers/firmware/efi/efibc.c b/drivers/firmware/efi/efibc.c new file mode 100644 index 000000000..15a47539d --- /dev/null +++ b/drivers/firmware/efi/efibc.c @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * efibc: control EFI bootloaders which obey LoaderEntryOneShot var + * Copyright (c) 2013-2016, Intel Corporation. + */ + +#define pr_fmt(fmt) "efibc: " fmt + +#include <linux/efi.h> +#include <linux/module.h> +#include <linux/reboot.h> +#include <linux/slab.h> + +static void efibc_str_to_str16(const char *str, efi_char16_t *str16) +{ + size_t i; + + for (i = 0; i < strlen(str); i++) + str16[i] = str[i]; + + str16[i] = '\0'; +} + +static int efibc_set_variable(const char *name, const char *value) +{ + int ret; + efi_guid_t guid = LINUX_EFI_LOADER_ENTRY_GUID; + struct efivar_entry *entry; + size_t size = (strlen(value) + 1) * sizeof(efi_char16_t); + + if (size > sizeof(entry->var.Data)) { + pr_err("value is too large (%zu bytes) for '%s' EFI variable\n", size, name); + return -EINVAL; + } + + entry = kmalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) { + pr_err("failed to allocate efivar entry for '%s' EFI variable\n", name); + return -ENOMEM; + } + + efibc_str_to_str16(name, entry->var.VariableName); + efibc_str_to_str16(value, (efi_char16_t *)entry->var.Data); + memcpy(&entry->var.VendorGuid, &guid, sizeof(guid)); + + ret = efivar_entry_set_safe(entry->var.VariableName, + entry->var.VendorGuid, + EFI_VARIABLE_NON_VOLATILE + | EFI_VARIABLE_BOOTSERVICE_ACCESS + | EFI_VARIABLE_RUNTIME_ACCESS, + false, size, entry->var.Data); + + if (ret) + pr_err("failed to set %s EFI variable: 0x%x\n", + name, ret); + + kfree(entry); + return ret; +} + +static int efibc_reboot_notifier_call(struct notifier_block *notifier, + unsigned long event, void *data) +{ + const char *reason = "shutdown"; + int ret; + + if (event == SYS_RESTART) + reason = "reboot"; + + ret = efibc_set_variable("LoaderEntryRebootReason", reason); + if (ret || !data) + return NOTIFY_DONE; + + efibc_set_variable("LoaderEntryOneShot", (char *)data); + + return NOTIFY_DONE; +} + +static struct notifier_block efibc_reboot_notifier = { + .notifier_call = efibc_reboot_notifier_call, +}; + +static int __init efibc_init(void) +{ + int ret; + + if (!efivars_kobject() || !efivar_supports_writes()) + return -ENODEV; + + ret = register_reboot_notifier(&efibc_reboot_notifier); + if (ret) + pr_err("unable to register reboot notifier\n"); + + return ret; +} +module_init(efibc_init); + +static void __exit efibc_exit(void) +{ + unregister_reboot_notifier(&efibc_reboot_notifier); +} +module_exit(efibc_exit); + +MODULE_AUTHOR("Jeremy Compostella <jeremy.compostella@intel.com>"); +MODULE_AUTHOR("Matt Gumbel <matthew.k.gumbel@intel.com"); +MODULE_DESCRIPTION("EFI Bootloader Control"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c new file mode 100644 index 000000000..e6b16b3a1 --- /dev/null +++ b/drivers/firmware/efi/efivars.c @@ -0,0 +1,670 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Originally from efivars.c, + * + * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> + * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> + * + * This code takes all variables accessible from EFI runtime and + * exports them via sysfs + */ + +#include <linux/efi.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/ucs2_string.h> +#include <linux/compat.h> + +#define EFIVARS_VERSION "0.08" +#define EFIVARS_DATE "2004-May-17" + +MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); +MODULE_DESCRIPTION("sysfs interface to EFI Variables"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(EFIVARS_VERSION); + +static LIST_HEAD(efivar_sysfs_list); + +static struct kset *efivars_kset; + +static struct bin_attribute *efivars_new_var; +static struct bin_attribute *efivars_del_var; + +struct compat_efi_variable { + efi_char16_t VariableName[EFI_VAR_NAME_LEN/sizeof(efi_char16_t)]; + efi_guid_t VendorGuid; + __u32 DataSize; + __u8 Data[1024]; + __u32 Status; + __u32 Attributes; +} __packed; + +struct efivar_attribute { + struct attribute attr; + ssize_t (*show) (struct efivar_entry *entry, char *buf); + ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count); +}; + +#define EFIVAR_ATTR(_name, _mode, _show, _store) \ +struct efivar_attribute efivar_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode}, \ + .show = _show, \ + .store = _store, \ +}; + +#define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr) +#define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj) + +/* + * Prototype for sysfs creation function + */ +static int +efivar_create_sysfs_entry(struct efivar_entry *new_var); + +static ssize_t +efivar_guid_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + char *str = buf; + + if (!entry || !buf) + return 0; + + efi_guid_to_str(&var->VendorGuid, str); + str += strlen(str); + str += sprintf(str, "\n"); + + return str - buf; +} + +static ssize_t +efivar_attr_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + unsigned long size = sizeof(var->Data); + char *str = buf; + int ret; + + if (!entry || !buf) + return -EINVAL; + + ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data); + var->DataSize = size; + if (ret) + return -EIO; + + if (var->Attributes & EFI_VARIABLE_NON_VOLATILE) + str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n"); + if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS) + str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n"); + if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) + str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n"); + if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) + str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n"); + if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) + str += sprintf(str, + "EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n"); + if (var->Attributes & + EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) + str += sprintf(str, + "EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n"); + if (var->Attributes & EFI_VARIABLE_APPEND_WRITE) + str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n"); + return str - buf; +} + +static ssize_t +efivar_size_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + unsigned long size = sizeof(var->Data); + char *str = buf; + int ret; + + if (!entry || !buf) + return -EINVAL; + + ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data); + var->DataSize = size; + if (ret) + return -EIO; + + str += sprintf(str, "0x%lx\n", var->DataSize); + return str - buf; +} + +static ssize_t +efivar_data_read(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + unsigned long size = sizeof(var->Data); + int ret; + + if (!entry || !buf) + return -EINVAL; + + ret = efivar_entry_get(entry, &var->Attributes, &size, var->Data); + var->DataSize = size; + if (ret) + return -EIO; + + memcpy(buf, var->Data, var->DataSize); + return var->DataSize; +} + +static inline int +sanity_check(struct efi_variable *var, efi_char16_t *name, efi_guid_t vendor, + unsigned long size, u32 attributes, u8 *data) +{ + /* + * If only updating the variable data, then the name + * and guid should remain the same + */ + if (memcmp(name, var->VariableName, sizeof(var->VariableName)) || + efi_guidcmp(vendor, var->VendorGuid)) { + printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n"); + return -EINVAL; + } + + if ((size <= 0) || (attributes == 0)){ + printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n"); + return -EINVAL; + } + + if ((attributes & ~EFI_VARIABLE_MASK) != 0 || + efivar_validate(vendor, name, data, size) == false) { + printk(KERN_ERR "efivars: Malformed variable content\n"); + return -EINVAL; + } + + return 0; +} + +static void +copy_out_compat(struct efi_variable *dst, struct compat_efi_variable *src) +{ + memcpy(dst->VariableName, src->VariableName, EFI_VAR_NAME_LEN); + memcpy(dst->Data, src->Data, sizeof(src->Data)); + + dst->VendorGuid = src->VendorGuid; + dst->DataSize = src->DataSize; + dst->Attributes = src->Attributes; +} + +/* + * We allow each variable to be edited via rewriting the + * entire efi variable structure. + */ +static ssize_t +efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count) +{ + struct efi_variable *new_var, *var = &entry->var; + efi_char16_t *name; + unsigned long size; + efi_guid_t vendor; + u32 attributes; + u8 *data; + int err; + + if (!entry || !buf) + return -EINVAL; + + if (in_compat_syscall()) { + struct compat_efi_variable *compat; + + if (count != sizeof(*compat)) + return -EINVAL; + + compat = (struct compat_efi_variable *)buf; + attributes = compat->Attributes; + vendor = compat->VendorGuid; + name = compat->VariableName; + size = compat->DataSize; + data = compat->Data; + + err = sanity_check(var, name, vendor, size, attributes, data); + if (err) + return err; + + copy_out_compat(&entry->var, compat); + } else { + if (count != sizeof(struct efi_variable)) + return -EINVAL; + + new_var = (struct efi_variable *)buf; + + attributes = new_var->Attributes; + vendor = new_var->VendorGuid; + name = new_var->VariableName; + size = new_var->DataSize; + data = new_var->Data; + + err = sanity_check(var, name, vendor, size, attributes, data); + if (err) + return err; + + memcpy(&entry->var, new_var, count); + } + + err = efivar_entry_set(entry, attributes, size, data, NULL); + if (err) { + printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err); + return -EIO; + } + + return count; +} + +static ssize_t +efivar_show_raw(struct efivar_entry *entry, char *buf) +{ + struct efi_variable *var = &entry->var; + struct compat_efi_variable *compat; + unsigned long datasize = sizeof(var->Data); + size_t size; + int ret; + + if (!entry || !buf) + return 0; + + ret = efivar_entry_get(entry, &var->Attributes, &datasize, var->Data); + var->DataSize = datasize; + if (ret) + return -EIO; + + if (in_compat_syscall()) { + compat = (struct compat_efi_variable *)buf; + + size = sizeof(*compat); + memcpy(compat->VariableName, var->VariableName, + EFI_VAR_NAME_LEN); + memcpy(compat->Data, var->Data, sizeof(compat->Data)); + + compat->VendorGuid = var->VendorGuid; + compat->DataSize = var->DataSize; + compat->Attributes = var->Attributes; + } else { + size = sizeof(*var); + memcpy(buf, var, size); + } + + return size; +} + +/* + * Generic read/write functions that call the specific functions of + * the attributes... + */ +static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + struct efivar_entry *var = to_efivar_entry(kobj); + struct efivar_attribute *efivar_attr = to_efivar_attr(attr); + ssize_t ret = -EIO; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (efivar_attr->show) { + ret = efivar_attr->show(var, buf); + } + return ret; +} + +static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + struct efivar_entry *var = to_efivar_entry(kobj); + struct efivar_attribute *efivar_attr = to_efivar_attr(attr); + ssize_t ret = -EIO; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (efivar_attr->store) + ret = efivar_attr->store(var, buf, count); + + return ret; +} + +static const struct sysfs_ops efivar_attr_ops = { + .show = efivar_attr_show, + .store = efivar_attr_store, +}; + +static void efivar_release(struct kobject *kobj) +{ + struct efivar_entry *var = to_efivar_entry(kobj); + kfree(var); +} + +static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL); +static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL); +static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL); +static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL); +static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw); + +static struct attribute *def_attrs[] = { + &efivar_attr_guid.attr, + &efivar_attr_size.attr, + &efivar_attr_attributes.attr, + &efivar_attr_data.attr, + &efivar_attr_raw_var.attr, + NULL, +}; + +static struct kobj_type efivar_ktype = { + .release = efivar_release, + .sysfs_ops = &efivar_attr_ops, + .default_attrs = def_attrs, +}; + +static ssize_t efivar_create(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t pos, size_t count) +{ + struct compat_efi_variable *compat = (struct compat_efi_variable *)buf; + struct efi_variable *new_var = (struct efi_variable *)buf; + struct efivar_entry *new_entry; + bool need_compat = in_compat_syscall(); + efi_char16_t *name; + unsigned long size; + u32 attributes; + u8 *data; + int err; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (need_compat) { + if (count != sizeof(*compat)) + return -EINVAL; + + attributes = compat->Attributes; + name = compat->VariableName; + size = compat->DataSize; + data = compat->Data; + } else { + if (count != sizeof(*new_var)) + return -EINVAL; + + attributes = new_var->Attributes; + name = new_var->VariableName; + size = new_var->DataSize; + data = new_var->Data; + } + + if ((attributes & ~EFI_VARIABLE_MASK) != 0 || + efivar_validate(new_var->VendorGuid, name, data, + size) == false) { + printk(KERN_ERR "efivars: Malformed variable content\n"); + return -EINVAL; + } + + new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL); + if (!new_entry) + return -ENOMEM; + + if (need_compat) + copy_out_compat(&new_entry->var, compat); + else + memcpy(&new_entry->var, new_var, sizeof(*new_var)); + + err = efivar_entry_set(new_entry, attributes, size, + data, &efivar_sysfs_list); + if (err) { + if (err == -EEXIST) + err = -EINVAL; + goto out; + } + + if (efivar_create_sysfs_entry(new_entry)) { + printk(KERN_WARNING "efivars: failed to create sysfs entry.\n"); + kfree(new_entry); + } + return count; + +out: + kfree(new_entry); + return err; +} + +static ssize_t efivar_delete(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t pos, size_t count) +{ + struct efi_variable *del_var = (struct efi_variable *)buf; + struct compat_efi_variable *compat; + struct efivar_entry *entry; + efi_char16_t *name; + efi_guid_t vendor; + int err = 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (in_compat_syscall()) { + if (count != sizeof(*compat)) + return -EINVAL; + + compat = (struct compat_efi_variable *)buf; + name = compat->VariableName; + vendor = compat->VendorGuid; + } else { + if (count != sizeof(*del_var)) + return -EINVAL; + + name = del_var->VariableName; + vendor = del_var->VendorGuid; + } + + if (efivar_entry_iter_begin()) + return -EINTR; + entry = efivar_entry_find(name, vendor, &efivar_sysfs_list, true); + if (!entry) + err = -EINVAL; + else if (__efivar_entry_delete(entry)) + err = -EIO; + + if (err) { + efivar_entry_iter_end(); + return err; + } + + if (!entry->scanning) { + efivar_entry_iter_end(); + efivar_unregister(entry); + } else + efivar_entry_iter_end(); + + /* It's dead Jim.... */ + return count; +} + +/** + * efivar_create_sysfs_entry - create a new entry in sysfs + * @new_var: efivar entry to create + * + * Returns 0 on success, negative error code on failure + */ +static int +efivar_create_sysfs_entry(struct efivar_entry *new_var) +{ + int short_name_size; + char *short_name; + unsigned long utf8_name_size; + efi_char16_t *variable_name = new_var->var.VariableName; + int ret; + + /* + * Length of the variable bytes in UTF8, plus the '-' separator, + * plus the GUID, plus trailing NUL + */ + utf8_name_size = ucs2_utf8size(variable_name); + short_name_size = utf8_name_size + 1 + EFI_VARIABLE_GUID_LEN + 1; + + short_name = kmalloc(short_name_size, GFP_KERNEL); + if (!short_name) + return -ENOMEM; + + ucs2_as_utf8(short_name, variable_name, short_name_size); + + /* This is ugly, but necessary to separate one vendor's + private variables from another's. */ + short_name[utf8_name_size] = '-'; + efi_guid_to_str(&new_var->var.VendorGuid, + short_name + utf8_name_size + 1); + + new_var->kobj.kset = efivars_kset; + + ret = kobject_init_and_add(&new_var->kobj, &efivar_ktype, + NULL, "%s", short_name); + kfree(short_name); + if (ret) { + kobject_put(&new_var->kobj); + return ret; + } + + kobject_uevent(&new_var->kobj, KOBJ_ADD); + if (efivar_entry_add(new_var, &efivar_sysfs_list)) { + efivar_unregister(new_var); + return -EINTR; + } + + return 0; +} + +static int +create_efivars_bin_attributes(void) +{ + struct bin_attribute *attr; + int error; + + /* new_var */ + attr = kzalloc(sizeof(*attr), GFP_KERNEL); + if (!attr) + return -ENOMEM; + + attr->attr.name = "new_var"; + attr->attr.mode = 0200; + attr->write = efivar_create; + efivars_new_var = attr; + + /* del_var */ + attr = kzalloc(sizeof(*attr), GFP_KERNEL); + if (!attr) { + error = -ENOMEM; + goto out_free; + } + attr->attr.name = "del_var"; + attr->attr.mode = 0200; + attr->write = efivar_delete; + efivars_del_var = attr; + + sysfs_bin_attr_init(efivars_new_var); + sysfs_bin_attr_init(efivars_del_var); + + /* Register */ + error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_new_var); + if (error) { + printk(KERN_ERR "efivars: unable to create new_var sysfs file" + " due to error %d\n", error); + goto out_free; + } + + error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_del_var); + if (error) { + printk(KERN_ERR "efivars: unable to create del_var sysfs file" + " due to error %d\n", error); + sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var); + goto out_free; + } + + return 0; +out_free: + kfree(efivars_del_var); + efivars_del_var = NULL; + kfree(efivars_new_var); + efivars_new_var = NULL; + return error; +} + +static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor, + unsigned long name_size, void *data) +{ + struct efivar_entry *entry; + + entry = kzalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) + return -ENOMEM; + + memcpy(entry->var.VariableName, name, name_size); + memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t)); + + efivar_create_sysfs_entry(entry); + + return 0; +} + +static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data) +{ + int err = efivar_entry_remove(entry); + + if (err) + return err; + efivar_unregister(entry); + return 0; +} + +static void efivars_sysfs_exit(void) +{ + /* Remove all entries and destroy */ + int err; + + err = __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list, + NULL, NULL); + if (err) { + pr_err("efivars: Failed to destroy sysfs entries\n"); + return; + } + + if (efivars_new_var) + sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var); + if (efivars_del_var) + sysfs_remove_bin_file(&efivars_kset->kobj, efivars_del_var); + kfree(efivars_new_var); + kfree(efivars_del_var); + kset_unregister(efivars_kset); +} + +static int efivars_sysfs_init(void) +{ + struct kobject *parent_kobj = efivars_kobject(); + int error = 0; + + /* No efivars has been registered yet */ + if (!parent_kobj || !efivar_supports_writes()) + return 0; + + printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION, + EFIVARS_DATE); + + efivars_kset = kset_create_and_add("vars", NULL, parent_kobj); + if (!efivars_kset) { + printk(KERN_ERR "efivars: Subsystem registration failed.\n"); + return -ENOMEM; + } + + efivar_init(efivars_sysfs_callback, NULL, true, &efivar_sysfs_list); + + error = create_efivars_bin_attributes(); + if (error) { + efivars_sysfs_exit(); + return error; + } + + return 0; +} + +module_init(efivars_sysfs_init); +module_exit(efivars_sysfs_exit); diff --git a/drivers/firmware/efi/embedded-firmware.c b/drivers/firmware/efi/embedded-firmware.c new file mode 100644 index 000000000..21ae0c482 --- /dev/null +++ b/drivers/firmware/efi/embedded-firmware.c @@ -0,0 +1,147 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Support for extracting embedded firmware for peripherals from EFI code, + * + * Copyright (c) 2018 Hans de Goede <hdegoede@redhat.com> + */ + +#include <linux/dmi.h> +#include <linux/efi.h> +#include <linux/efi_embedded_fw.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/vmalloc.h> +#include <crypto/sha.h> + +/* Exported for use by lib/test_firmware.c only */ +LIST_HEAD(efi_embedded_fw_list); +EXPORT_SYMBOL_NS_GPL(efi_embedded_fw_list, TEST_FIRMWARE); +bool efi_embedded_fw_checked; +EXPORT_SYMBOL_NS_GPL(efi_embedded_fw_checked, TEST_FIRMWARE); + +static const struct dmi_system_id * const embedded_fw_table[] = { +#ifdef CONFIG_TOUCHSCREEN_DMI + touchscreen_dmi_table, +#endif + NULL +}; + +/* + * Note the efi_check_for_embedded_firmwares() code currently makes the + * following 2 assumptions. This may needs to be revisited if embedded firmware + * is found where this is not true: + * 1) The firmware is only found in EFI_BOOT_SERVICES_CODE memory segments + * 2) The firmware always starts at an offset which is a multiple of 8 bytes + */ +static int __init efi_check_md_for_embedded_firmware( + efi_memory_desc_t *md, const struct efi_embedded_fw_desc *desc) +{ + struct efi_embedded_fw *fw; + u8 hash[32]; + u64 i, size; + u8 *map; + + size = md->num_pages << EFI_PAGE_SHIFT; + map = memremap(md->phys_addr, size, MEMREMAP_WB); + if (!map) { + pr_err("Error mapping EFI mem at %#llx\n", md->phys_addr); + return -ENOMEM; + } + + for (i = 0; (i + desc->length) <= size; i += 8) { + if (memcmp(map + i, desc->prefix, EFI_EMBEDDED_FW_PREFIX_LEN)) + continue; + + sha256(map + i, desc->length, hash); + if (memcmp(hash, desc->sha256, 32) == 0) + break; + } + if ((i + desc->length) > size) { + memunmap(map); + return -ENOENT; + } + + pr_info("Found EFI embedded fw '%s'\n", desc->name); + + fw = kmalloc(sizeof(*fw), GFP_KERNEL); + if (!fw) { + memunmap(map); + return -ENOMEM; + } + + fw->data = kmemdup(map + i, desc->length, GFP_KERNEL); + memunmap(map); + if (!fw->data) { + kfree(fw); + return -ENOMEM; + } + + fw->name = desc->name; + fw->length = desc->length; + list_add(&fw->list, &efi_embedded_fw_list); + + return 0; +} + +void __init efi_check_for_embedded_firmwares(void) +{ + const struct efi_embedded_fw_desc *fw_desc; + const struct dmi_system_id *dmi_id; + efi_memory_desc_t *md; + int i, r; + + for (i = 0; embedded_fw_table[i]; i++) { + dmi_id = dmi_first_match(embedded_fw_table[i]); + if (!dmi_id) + continue; + + fw_desc = dmi_id->driver_data; + + /* + * In some drivers the struct driver_data contains may contain + * other driver specific data after the fw_desc struct; and + * the fw_desc struct itself may be empty, skip these. + */ + if (!fw_desc->name) + continue; + + for_each_efi_memory_desc(md) { + if (md->type != EFI_BOOT_SERVICES_CODE) + continue; + + r = efi_check_md_for_embedded_firmware(md, fw_desc); + if (r == 0) + break; + } + } + + efi_embedded_fw_checked = true; +} + +int efi_get_embedded_fw(const char *name, const u8 **data, size_t *size) +{ + struct efi_embedded_fw *iter, *fw = NULL; + + if (!efi_embedded_fw_checked) { + pr_warn("Warning %s called while we did not check for embedded fw\n", + __func__); + return -ENOENT; + } + + list_for_each_entry(iter, &efi_embedded_fw_list, list) { + if (strcmp(name, iter->name) == 0) { + fw = iter; + break; + } + } + + if (!fw) + return -ENOENT; + + *data = fw->data; + *size = fw->length; + + return 0; +} +EXPORT_SYMBOL_GPL(efi_get_embedded_fw); diff --git a/drivers/firmware/efi/esrt.c b/drivers/firmware/efi/esrt.c new file mode 100644 index 000000000..d59152721 --- /dev/null +++ b/drivers/firmware/efi/esrt.c @@ -0,0 +1,438 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * esrt.c + * + * This module exports EFI System Resource Table (ESRT) entries into userspace + * through the sysfs file system. The ESRT provides a read-only catalog of + * system components for which the system accepts firmware upgrades via UEFI's + * "Capsule Update" feature. This module allows userland utilities to evaluate + * what firmware updates can be applied to this system, and potentially arrange + * for those updates to occur. + * + * Data is currently found below /sys/firmware/efi/esrt/... + */ +#define pr_fmt(fmt) "esrt: " fmt + +#include <linux/capability.h> +#include <linux/device.h> +#include <linux/efi.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/kobject.h> +#include <linux/list.h> +#include <linux/memblock.h> +#include <linux/slab.h> +#include <linux/types.h> + +#include <asm/io.h> +#include <asm/early_ioremap.h> + +struct efi_system_resource_entry_v1 { + efi_guid_t fw_class; + u32 fw_type; + u32 fw_version; + u32 lowest_supported_fw_version; + u32 capsule_flags; + u32 last_attempt_version; + u32 last_attempt_status; +}; + +/* + * _count and _version are what they seem like. _max is actually just + * accounting info for the firmware when creating the table; it should never + * have been exposed to us. To wit, the spec says: + * The maximum number of resource array entries that can be within the + * table without reallocating the table, must not be zero. + * Since there's no guidance about what that means in terms of memory layout, + * it means nothing to us. + */ +struct efi_system_resource_table { + u32 fw_resource_count; + u32 fw_resource_count_max; + u64 fw_resource_version; + u8 entries[]; +}; + +static phys_addr_t esrt_data; +static size_t esrt_data_size; + +static struct efi_system_resource_table *esrt; + +struct esre_entry { + union { + struct efi_system_resource_entry_v1 *esre1; + } esre; + + struct kobject kobj; + struct list_head list; +}; + +/* global list of esre_entry. */ +static LIST_HEAD(entry_list); + +/* entry attribute */ +struct esre_attribute { + struct attribute attr; + ssize_t (*show)(struct esre_entry *entry, char *buf); + ssize_t (*store)(struct esre_entry *entry, + const char *buf, size_t count); +}; + +static struct esre_entry *to_entry(struct kobject *kobj) +{ + return container_of(kobj, struct esre_entry, kobj); +} + +static struct esre_attribute *to_attr(struct attribute *attr) +{ + return container_of(attr, struct esre_attribute, attr); +} + +static ssize_t esre_attr_show(struct kobject *kobj, + struct attribute *_attr, char *buf) +{ + struct esre_entry *entry = to_entry(kobj); + struct esre_attribute *attr = to_attr(_attr); + + /* Don't tell normal users what firmware versions we've got... */ + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + return attr->show(entry, buf); +} + +static const struct sysfs_ops esre_attr_ops = { + .show = esre_attr_show, +}; + +/* Generic ESRT Entry ("ESRE") support. */ +static ssize_t fw_class_show(struct esre_entry *entry, char *buf) +{ + char *str = buf; + + efi_guid_to_str(&entry->esre.esre1->fw_class, str); + str += strlen(str); + str += sprintf(str, "\n"); + + return str - buf; +} + +static struct esre_attribute esre_fw_class = __ATTR_RO_MODE(fw_class, 0400); + +#define esre_attr_decl(name, size, fmt) \ +static ssize_t name##_show(struct esre_entry *entry, char *buf) \ +{ \ + return sprintf(buf, fmt "\n", \ + le##size##_to_cpu(entry->esre.esre1->name)); \ +} \ +\ +static struct esre_attribute esre_##name = __ATTR_RO_MODE(name, 0400) + +esre_attr_decl(fw_type, 32, "%u"); +esre_attr_decl(fw_version, 32, "%u"); +esre_attr_decl(lowest_supported_fw_version, 32, "%u"); +esre_attr_decl(capsule_flags, 32, "0x%x"); +esre_attr_decl(last_attempt_version, 32, "%u"); +esre_attr_decl(last_attempt_status, 32, "%u"); + +static struct attribute *esre1_attrs[] = { + &esre_fw_class.attr, + &esre_fw_type.attr, + &esre_fw_version.attr, + &esre_lowest_supported_fw_version.attr, + &esre_capsule_flags.attr, + &esre_last_attempt_version.attr, + &esre_last_attempt_status.attr, + NULL +}; +static void esre_release(struct kobject *kobj) +{ + struct esre_entry *entry = to_entry(kobj); + + list_del(&entry->list); + kfree(entry); +} + +static struct kobj_type esre1_ktype = { + .release = esre_release, + .sysfs_ops = &esre_attr_ops, + .default_attrs = esre1_attrs, +}; + + +static struct kobject *esrt_kobj; +static struct kset *esrt_kset; + +static int esre_create_sysfs_entry(void *esre, int entry_num) +{ + struct esre_entry *entry; + + entry = kzalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) + return -ENOMEM; + + entry->kobj.kset = esrt_kset; + + if (esrt->fw_resource_version == 1) { + int rc = 0; + + entry->esre.esre1 = esre; + rc = kobject_init_and_add(&entry->kobj, &esre1_ktype, NULL, + "entry%d", entry_num); + if (rc) { + kobject_put(&entry->kobj); + return rc; + } + } + + list_add_tail(&entry->list, &entry_list); + return 0; +} + +/* support for displaying ESRT fields at the top level */ +#define esrt_attr_decl(name, size, fmt) \ +static ssize_t name##_show(struct kobject *kobj, \ + struct kobj_attribute *attr, char *buf)\ +{ \ + return sprintf(buf, fmt "\n", le##size##_to_cpu(esrt->name)); \ +} \ +\ +static struct kobj_attribute esrt_##name = __ATTR_RO_MODE(name, 0400) + +esrt_attr_decl(fw_resource_count, 32, "%u"); +esrt_attr_decl(fw_resource_count_max, 32, "%u"); +esrt_attr_decl(fw_resource_version, 64, "%llu"); + +static struct attribute *esrt_attrs[] = { + &esrt_fw_resource_count.attr, + &esrt_fw_resource_count_max.attr, + &esrt_fw_resource_version.attr, + NULL, +}; + +static inline int esrt_table_exists(void) +{ + if (!efi_enabled(EFI_CONFIG_TABLES)) + return 0; + if (efi.esrt == EFI_INVALID_TABLE_ADDR) + return 0; + return 1; +} + +static umode_t esrt_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + if (!esrt_table_exists()) + return 0; + return attr->mode; +} + +static const struct attribute_group esrt_attr_group = { + .attrs = esrt_attrs, + .is_visible = esrt_attr_is_visible, +}; + +/* + * remap the table, validate it, mark it reserved and unmap it. + */ +void __init efi_esrt_init(void) +{ + void *va; + struct efi_system_resource_table tmpesrt; + size_t size, max, entry_size, entries_size; + efi_memory_desc_t md; + int rc; + phys_addr_t end; + + if (!efi_enabled(EFI_MEMMAP)) + return; + + pr_debug("esrt-init: loading.\n"); + if (!esrt_table_exists()) + return; + + rc = efi_mem_desc_lookup(efi.esrt, &md); + if (rc < 0 || + (!(md.attribute & EFI_MEMORY_RUNTIME) && + md.type != EFI_BOOT_SERVICES_DATA && + md.type != EFI_RUNTIME_SERVICES_DATA)) { + pr_warn("ESRT header is not in the memory map.\n"); + return; + } + + max = efi_mem_desc_end(&md); + if (max < efi.esrt) { + pr_err("EFI memory descriptor is invalid. (esrt: %p max: %p)\n", + (void *)efi.esrt, (void *)max); + return; + } + + size = sizeof(*esrt); + max -= efi.esrt; + + if (max < size) { + pr_err("ESRT header doesn't fit on single memory map entry. (size: %zu max: %zu)\n", + size, max); + return; + } + + va = early_memremap(efi.esrt, size); + if (!va) { + pr_err("early_memremap(%p, %zu) failed.\n", (void *)efi.esrt, + size); + return; + } + + memcpy(&tmpesrt, va, sizeof(tmpesrt)); + early_memunmap(va, size); + + if (tmpesrt.fw_resource_version != 1) { + pr_err("Unsupported ESRT version %lld.\n", + tmpesrt.fw_resource_version); + return; + } + + entry_size = sizeof(struct efi_system_resource_entry_v1); + if (tmpesrt.fw_resource_count > 0 && max - size < entry_size) { + pr_err("ESRT memory map entry can only hold the header. (max: %zu size: %zu)\n", + max - size, entry_size); + return; + } + + /* + * The format doesn't really give us any boundary to test here, + * so I'm making up 128 as the max number of individually updatable + * components we support. + * 128 should be pretty excessive, but there's still some chance + * somebody will do that someday and we'll need to raise this. + */ + if (tmpesrt.fw_resource_count > 128) { + pr_err("ESRT says fw_resource_count has very large value %d.\n", + tmpesrt.fw_resource_count); + return; + } + + /* + * We know it can't be larger than N * sizeof() here, and N is limited + * by the previous test to a small number, so there's no overflow. + */ + entries_size = tmpesrt.fw_resource_count * entry_size; + if (max < size + entries_size) { + pr_err("ESRT does not fit on single memory map entry (size: %zu max: %zu)\n", + size, max); + return; + } + + size += entries_size; + + esrt_data = (phys_addr_t)efi.esrt; + esrt_data_size = size; + + end = esrt_data + size; + pr_info("Reserving ESRT space from %pa to %pa.\n", &esrt_data, &end); + if (md.type == EFI_BOOT_SERVICES_DATA) + efi_mem_reserve(esrt_data, esrt_data_size); + + pr_debug("esrt-init: loaded.\n"); +} + +static int __init register_entries(void) +{ + struct efi_system_resource_entry_v1 *v1_entries = (void *)esrt->entries; + int i, rc; + + if (!esrt_table_exists()) + return 0; + + for (i = 0; i < le32_to_cpu(esrt->fw_resource_count); i++) { + void *esre = NULL; + if (esrt->fw_resource_version == 1) { + esre = &v1_entries[i]; + } else { + pr_err("Unsupported ESRT version %lld.\n", + esrt->fw_resource_version); + return -EINVAL; + } + + rc = esre_create_sysfs_entry(esre, i); + if (rc < 0) { + pr_err("ESRT entry creation failed with error %d.\n", + rc); + return rc; + } + } + return 0; +} + +static void cleanup_entry_list(void) +{ + struct esre_entry *entry, *next; + + list_for_each_entry_safe(entry, next, &entry_list, list) { + kobject_put(&entry->kobj); + } +} + +static int __init esrt_sysfs_init(void) +{ + int error; + + pr_debug("esrt-sysfs: loading.\n"); + if (!esrt_data || !esrt_data_size) + return -ENOSYS; + + esrt = memremap(esrt_data, esrt_data_size, MEMREMAP_WB); + if (!esrt) { + pr_err("memremap(%pa, %zu) failed.\n", &esrt_data, + esrt_data_size); + return -ENOMEM; + } + + esrt_kobj = kobject_create_and_add("esrt", efi_kobj); + if (!esrt_kobj) { + pr_err("Firmware table registration failed.\n"); + error = -ENOMEM; + goto err; + } + + error = sysfs_create_group(esrt_kobj, &esrt_attr_group); + if (error) { + pr_err("Sysfs attribute export failed with error %d.\n", + error); + goto err_remove_esrt; + } + + esrt_kset = kset_create_and_add("entries", NULL, esrt_kobj); + if (!esrt_kset) { + pr_err("kset creation failed.\n"); + error = -ENOMEM; + goto err_remove_group; + } + + error = register_entries(); + if (error) + goto err_cleanup_list; + + pr_debug("esrt-sysfs: loaded.\n"); + + return 0; +err_cleanup_list: + cleanup_entry_list(); + kset_unregister(esrt_kset); +err_remove_group: + sysfs_remove_group(esrt_kobj, &esrt_attr_group); +err_remove_esrt: + kobject_put(esrt_kobj); +err: + memunmap(esrt); + esrt = NULL; + return error; +} +device_initcall(esrt_sysfs_init); + +/* +MODULE_AUTHOR("Peter Jones <pjones@redhat.com>"); +MODULE_DESCRIPTION("EFI System Resource Table support"); +MODULE_LICENSE("GPL"); +*/ diff --git a/drivers/firmware/efi/fake_mem.c b/drivers/firmware/efi/fake_mem.c new file mode 100644 index 000000000..6e0f34a38 --- /dev/null +++ b/drivers/firmware/efi/fake_mem.c @@ -0,0 +1,124 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * fake_mem.c + * + * Copyright (C) 2015 FUJITSU LIMITED + * Author: Taku Izumi <izumi.taku@jp.fujitsu.com> + * + * This code introduces new boot option named "efi_fake_mem" + * By specifying this parameter, you can add arbitrary attribute to + * specific memory range by updating original (firmware provided) EFI + * memmap. + */ + +#include <linux/kernel.h> +#include <linux/efi.h> +#include <linux/init.h> +#include <linux/memblock.h> +#include <linux/types.h> +#include <linux/sort.h> +#include "fake_mem.h" + +struct efi_mem_range efi_fake_mems[EFI_MAX_FAKEMEM]; +int nr_fake_mem; + +static int __init cmp_fake_mem(const void *x1, const void *x2) +{ + const struct efi_mem_range *m1 = x1; + const struct efi_mem_range *m2 = x2; + + if (m1->range.start < m2->range.start) + return -1; + if (m1->range.start > m2->range.start) + return 1; + return 0; +} + +static void __init efi_fake_range(struct efi_mem_range *efi_range) +{ + struct efi_memory_map_data data = { 0 }; + int new_nr_map = efi.memmap.nr_map; + efi_memory_desc_t *md; + void *new_memmap; + + /* count up the number of EFI memory descriptor */ + for_each_efi_memory_desc(md) + new_nr_map += efi_memmap_split_count(md, &efi_range->range); + + /* allocate memory for new EFI memmap */ + if (efi_memmap_alloc(new_nr_map, &data) != 0) + return; + + /* create new EFI memmap */ + new_memmap = early_memremap(data.phys_map, data.size); + if (!new_memmap) { + __efi_memmap_free(data.phys_map, data.size, data.flags); + return; + } + + efi_memmap_insert(&efi.memmap, new_memmap, efi_range); + + /* swap into new EFI memmap */ + early_memunmap(new_memmap, data.size); + + efi_memmap_install(&data); +} + +void __init efi_fake_memmap(void) +{ + int i; + + if (!efi_enabled(EFI_MEMMAP) || !nr_fake_mem) + return; + + for (i = 0; i < nr_fake_mem; i++) + efi_fake_range(&efi_fake_mems[i]); + + /* print new EFI memmap */ + efi_print_memmap(); +} + +static int __init setup_fake_mem(char *p) +{ + u64 start = 0, mem_size = 0, attribute = 0; + int i; + + if (!p) + return -EINVAL; + + while (*p != '\0') { + mem_size = memparse(p, &p); + if (*p == '@') + start = memparse(p+1, &p); + else + break; + + if (*p == ':') + attribute = simple_strtoull(p+1, &p, 0); + else + break; + + if (nr_fake_mem >= EFI_MAX_FAKEMEM) + break; + + efi_fake_mems[nr_fake_mem].range.start = start; + efi_fake_mems[nr_fake_mem].range.end = start + mem_size - 1; + efi_fake_mems[nr_fake_mem].attribute = attribute; + nr_fake_mem++; + + if (*p == ',') + p++; + } + + sort(efi_fake_mems, nr_fake_mem, sizeof(struct efi_mem_range), + cmp_fake_mem, NULL); + + for (i = 0; i < nr_fake_mem; i++) + pr_info("efi_fake_mem: add attr=0x%016llx to [mem 0x%016llx-0x%016llx]", + efi_fake_mems[i].attribute, efi_fake_mems[i].range.start, + efi_fake_mems[i].range.end); + + return *p == '\0' ? 0 : -EINVAL; +} + +early_param("efi_fake_mem", setup_fake_mem); diff --git a/drivers/firmware/efi/fake_mem.h b/drivers/firmware/efi/fake_mem.h new file mode 100644 index 000000000..d52791af4 --- /dev/null +++ b/drivers/firmware/efi/fake_mem.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __EFI_FAKE_MEM_H__ +#define __EFI_FAKE_MEM_H__ +#include <asm/efi.h> + +#define EFI_MAX_FAKEMEM CONFIG_EFI_MAX_FAKE_MEM + +extern struct efi_mem_range efi_fake_mems[EFI_MAX_FAKEMEM]; +extern int nr_fake_mem; +#endif /* __EFI_FAKE_MEM_H__ */ diff --git a/drivers/firmware/efi/fdtparams.c b/drivers/firmware/efi/fdtparams.c new file mode 100644 index 000000000..e901f8564 --- /dev/null +++ b/drivers/firmware/efi/fdtparams.c @@ -0,0 +1,129 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#define pr_fmt(fmt) "efi: " fmt + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/efi.h> +#include <linux/libfdt.h> +#include <linux/of_fdt.h> + +#include <asm/unaligned.h> + +enum { + SYSTAB, + MMBASE, + MMSIZE, + DCSIZE, + DCVERS, + + PARAMCOUNT +}; + +static __initconst const char name[][22] = { + [SYSTAB] = "System Table ", + [MMBASE] = "MemMap Address ", + [MMSIZE] = "MemMap Size ", + [DCSIZE] = "MemMap Desc. Size ", + [DCVERS] = "MemMap Desc. Version ", +}; + +static __initconst const struct { + const char path[17]; + const char params[PARAMCOUNT][26]; +} dt_params[] = { + { +#ifdef CONFIG_XEN // <-------17------> + .path = "/hypervisor/uefi", + .params = { + [SYSTAB] = "xen,uefi-system-table", + [MMBASE] = "xen,uefi-mmap-start", + [MMSIZE] = "xen,uefi-mmap-size", + [DCSIZE] = "xen,uefi-mmap-desc-size", + [DCVERS] = "xen,uefi-mmap-desc-ver", + } + }, { +#endif + .path = "/chosen", + .params = { // <-----------26-----------> + [SYSTAB] = "linux,uefi-system-table", + [MMBASE] = "linux,uefi-mmap-start", + [MMSIZE] = "linux,uefi-mmap-size", + [DCSIZE] = "linux,uefi-mmap-desc-size", + [DCVERS] = "linux,uefi-mmap-desc-ver", + } + } +}; + +static int __init efi_get_fdt_prop(const void *fdt, int node, const char *pname, + const char *rname, void *var, int size) +{ + const void *prop; + int len; + u64 val; + + prop = fdt_getprop(fdt, node, pname, &len); + if (!prop) + return 1; + + val = (len == 4) ? (u64)be32_to_cpup(prop) : get_unaligned_be64(prop); + + if (size == 8) + *(u64 *)var = val; + else + *(u32 *)var = (val < U32_MAX) ? val : U32_MAX; // saturate + + if (efi_enabled(EFI_DBG)) + pr_info(" %s: 0x%0*llx\n", rname, size * 2, val); + + return 0; +} + +u64 __init efi_get_fdt_params(struct efi_memory_map_data *mm) +{ + const void *fdt = initial_boot_params; + unsigned long systab; + int i, j, node; + struct { + void *var; + int size; + } target[] = { + [SYSTAB] = { &systab, sizeof(systab) }, + [MMBASE] = { &mm->phys_map, sizeof(mm->phys_map) }, + [MMSIZE] = { &mm->size, sizeof(mm->size) }, + [DCSIZE] = { &mm->desc_size, sizeof(mm->desc_size) }, + [DCVERS] = { &mm->desc_version, sizeof(mm->desc_version) }, + }; + + BUILD_BUG_ON(ARRAY_SIZE(target) != ARRAY_SIZE(name)); + BUILD_BUG_ON(ARRAY_SIZE(target) != ARRAY_SIZE(dt_params[0].params)); + + if (!fdt) + return 0; + + for (i = 0; i < ARRAY_SIZE(dt_params); i++) { + node = fdt_path_offset(fdt, dt_params[i].path); + if (node < 0) + continue; + + if (efi_enabled(EFI_DBG)) + pr_info("Getting UEFI parameters from %s in DT:\n", + dt_params[i].path); + + for (j = 0; j < ARRAY_SIZE(target); j++) { + const char *pname = dt_params[i].params[j]; + + if (!efi_get_fdt_prop(fdt, node, pname, name[j], + target[j].var, target[j].size)) + continue; + if (!j) + goto notfound; + pr_err("Can't find property '%s' in DT!\n", pname); + return 0; + } + return systab; + } +notfound: + pr_info("UEFI not found.\n"); + return 0; +} diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile new file mode 100644 index 000000000..433e11dab --- /dev/null +++ b/drivers/firmware/efi/libstub/Makefile @@ -0,0 +1,149 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# The stub may be linked into the kernel proper or into a separate boot binary, +# but in either case, it executes before the kernel does (with MMU disabled) so +# things like ftrace and stack-protector are likely to cause trouble if left +# enabled, even if doing so doesn't break the build. +# +cflags-$(CONFIG_X86_32) := -march=i386 +cflags-$(CONFIG_X86_64) := -mcmodel=small +cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ \ + -fPIC -fno-strict-aliasing -mno-red-zone \ + -mno-mmx -mno-sse -fshort-wchar \ + -Wno-pointer-sign \ + $(call cc-disable-warning, address-of-packed-member) \ + $(call cc-disable-warning, gnu) \ + -fno-asynchronous-unwind-tables \ + $(CLANG_FLAGS) + +# arm64 uses the full KBUILD_CFLAGS so it's necessary to explicitly +# disable the stackleak plugin +cflags-$(CONFIG_ARM64) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ + -fpie $(DISABLE_STACKLEAK_PLUGIN) \ + $(call cc-option,-mbranch-protection=none) +cflags-$(CONFIG_ARM) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ + -fno-builtin -fpic \ + $(call cc-option,-mno-single-pic-base) +cflags-$(CONFIG_RISCV) := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) \ + -fpic + +cflags-$(CONFIG_EFI_GENERIC_STUB) += -I$(srctree)/scripts/dtc/libfdt + +KBUILD_CFLAGS := $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \ + -include $(srctree)/include/linux/hidden.h \ + -D__NO_FORTIFY \ + -ffreestanding \ + -fno-stack-protector \ + $(call cc-option,-fno-addrsig) \ + -D__DISABLE_EXPORTS + +# +# struct randomization only makes sense for Linux internal types, which the EFI +# stub code never touches, so let's turn off struct randomization for the stub +# altogether +# +KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS), $(KBUILD_CFLAGS)) + +# remove SCS flags from all objects in this directory +KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) + +GCOV_PROFILE := n +# Sanitizer runtimes are unavailable and cannot be linked here. +KASAN_SANITIZE := n +KCSAN_SANITIZE := n +UBSAN_SANITIZE := n +OBJECT_FILES_NON_STANDARD := y + +# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. +KCOV_INSTRUMENT := n + +lib-y := efi-stub-helper.o gop.o secureboot.o tpm.o \ + file.o mem.o random.o randomalloc.o pci.o \ + skip_spaces.o lib-cmdline.o lib-ctype.o \ + alignedmem.o relocate.o vsprintf.o + +# include the stub's generic dependencies from lib/ when building for ARM/arm64 +efi-deps-y := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c + +$(obj)/lib-%.o: $(srctree)/lib/%.c FORCE + $(call if_changed_rule,cc_o_c) + +lib-$(CONFIG_EFI_GENERIC_STUB) += efi-stub.o fdt.o string.o \ + $(patsubst %.c,lib-%.o,$(efi-deps-y)) + +lib-$(CONFIG_ARM) += arm32-stub.o +lib-$(CONFIG_ARM64) += arm64-stub.o +lib-$(CONFIG_X86) += x86-stub.o +lib-$(CONFIG_RISCV) += riscv-stub.o +CFLAGS_arm32-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET) + +# Even when -mbranch-protection=none is set, Clang will generate a +# .note.gnu.property for code-less object files (like lib/ctype.c), +# so work around this by explicitly removing the unwanted section. +# https://bugs.llvm.org/show_bug.cgi?id=46480 +STUBCOPY_FLAGS-y += --remove-section=.note.gnu.property + +# +# For x86, bootloaders like systemd-boot or grub-efi do not zero-initialize the +# .bss section, so the .bss section of the EFI stub needs to be included in the +# .data section of the compressed kernel to ensure initialization. Rename the +# .bss section here so it's easy to pick out in the linker script. +# +STUBCOPY_FLAGS-$(CONFIG_X86) += --rename-section .bss=.bss.efistub,load,alloc +STUBCOPY_RELOC-$(CONFIG_X86_32) := R_386_32 +STUBCOPY_RELOC-$(CONFIG_X86_64) := R_X86_64_64 + +# +# ARM discards the .data section because it disallows r/w data in the +# decompressor. So move our .data to .data.efistub and .bss to .bss.efistub, +# which are preserved explicitly by the decompressor linker script. +# +STUBCOPY_FLAGS-$(CONFIG_ARM) += --rename-section .data=.data.efistub \ + --rename-section .bss=.bss.efistub,load,alloc +STUBCOPY_RELOC-$(CONFIG_ARM) := R_ARM_ABS + +# +# arm64 puts the stub in the kernel proper, which will unnecessarily retain all +# code indefinitely unless it is annotated as __init/__initdata/__initconst etc. +# So let's apply the __init annotations at the section level, by prefixing +# the section names directly. This will ensure that even all the inline string +# literals are covered. +# The fact that the stub and the kernel proper are essentially the same binary +# also means that we need to be extra careful to make sure that the stub does +# not rely on any absolute symbol references, considering that the virtual +# kernel mapping that the linker uses is not active yet when the stub is +# executing. So build all C dependencies of the EFI stub into libstub, and do +# a verification pass to see if any absolute relocations exist in any of the +# object files. +# +extra-y := $(lib-y) +lib-y := $(patsubst %.o,%.stub.o,$(lib-y)) + +STUBCOPY_FLAGS-$(CONFIG_ARM64) += --prefix-alloc-sections=.init \ + --prefix-symbols=__efistub_ +STUBCOPY_RELOC-$(CONFIG_ARM64) := R_AARCH64_ABS + +# For RISC-V, we don't need anything special other than arm64. Keep all the +# symbols in .init section and make sure that no absolute symbols references +# doesn't exist. +STUBCOPY_FLAGS-$(CONFIG_RISCV) += --prefix-alloc-sections=.init \ + --prefix-symbols=__efistub_ +STUBCOPY_RELOC-$(CONFIG_RISCV) := R_RISCV_HI20 + +$(obj)/%.stub.o: $(obj)/%.o FORCE + $(call if_changed,stubcopy) + +# +# Strip debug sections and some other sections that may legally contain +# absolute relocations, so that we can inspect the remaining sections for +# such relocations. If none are found, regenerate the output object, but +# this time, use objcopy and leave all sections in place. +# +quiet_cmd_stubcopy = STUBCPY $@ + cmd_stubcopy = \ + $(STRIP) --strip-debug -o $@ $<; \ + if $(OBJDUMP) -r $@ | grep $(STUBCOPY_RELOC-y); then \ + echo "$@: absolute symbol references not allowed in the EFI stub" >&2; \ + /bin/false; \ + fi; \ + $(OBJCOPY) $(STUBCOPY_FLAGS-y) $< $@ diff --git a/drivers/firmware/efi/libstub/alignedmem.c b/drivers/firmware/efi/libstub/alignedmem.c new file mode 100644 index 000000000..1de9878dd --- /dev/null +++ b/drivers/firmware/efi/libstub/alignedmem.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/efi.h> +#include <asm/efi.h> + +#include "efistub.h" + +/** + * efi_allocate_pages_aligned() - Allocate memory pages + * @size: minimum number of bytes to allocate + * @addr: On return the address of the first allocated page. The first + * allocated page has alignment EFI_ALLOC_ALIGN which is an + * architecture dependent multiple of the page size. + * @max: the address that the last allocated memory page shall not + * exceed + * @align: minimum alignment of the base of the allocation + * + * Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according + * to @align, which should be >= EFI_ALLOC_ALIGN. The last allocated page will + * not exceed the address given by @max. + * + * Return: status code + */ +efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr, + unsigned long max, unsigned long align) +{ + efi_physical_addr_t alloc_addr; + efi_status_t status; + int slack; + + if (align < EFI_ALLOC_ALIGN) + align = EFI_ALLOC_ALIGN; + + alloc_addr = ALIGN_DOWN(max + 1, align) - 1; + size = round_up(size, EFI_ALLOC_ALIGN); + slack = align / EFI_PAGE_SIZE - 1; + + status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS, + EFI_LOADER_DATA, size / EFI_PAGE_SIZE + slack, + &alloc_addr); + if (status != EFI_SUCCESS) + return status; + + *addr = ALIGN((unsigned long)alloc_addr, align); + + if (slack > 0) { + int l = (alloc_addr & (align - 1)) / EFI_PAGE_SIZE; + + if (l) { + efi_bs_call(free_pages, alloc_addr, slack - l + 1); + slack = l - 1; + } + if (slack) + efi_bs_call(free_pages, *addr + size, slack); + } + return EFI_SUCCESS; +} diff --git a/drivers/firmware/efi/libstub/arm32-stub.c b/drivers/firmware/efi/libstub/arm32-stub.c new file mode 100644 index 000000000..4b5b2403b --- /dev/null +++ b/drivers/firmware/efi/libstub/arm32-stub.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2013 Linaro Ltd; <roy.franz@linaro.org> + */ +#include <linux/efi.h> +#include <asm/efi.h> + +#include "efistub.h" + +static efi_guid_t cpu_state_guid = LINUX_EFI_ARM_CPU_STATE_TABLE_GUID; + +struct efi_arm_entry_state *efi_entry_state; + +static void get_cpu_state(u32 *cpsr, u32 *sctlr) +{ + asm("mrs %0, cpsr" : "=r"(*cpsr)); + if ((*cpsr & MODE_MASK) == HYP_MODE) + asm("mrc p15, 4, %0, c1, c0, 0" : "=r"(*sctlr)); + else + asm("mrc p15, 0, %0, c1, c0, 0" : "=r"(*sctlr)); +} + +efi_status_t check_platform_features(void) +{ + efi_status_t status; + u32 cpsr, sctlr; + int block; + + get_cpu_state(&cpsr, &sctlr); + + efi_info("Entering in %s mode with MMU %sabled\n", + ((cpsr & MODE_MASK) == HYP_MODE) ? "HYP" : "SVC", + (sctlr & 1) ? "en" : "dis"); + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, + sizeof(*efi_entry_state), + (void **)&efi_entry_state); + if (status != EFI_SUCCESS) { + efi_err("allocate_pool() failed\n"); + return status; + } + + efi_entry_state->cpsr_before_ebs = cpsr; + efi_entry_state->sctlr_before_ebs = sctlr; + + status = efi_bs_call(install_configuration_table, &cpu_state_guid, + efi_entry_state); + if (status != EFI_SUCCESS) { + efi_err("install_configuration_table() failed\n"); + goto free_state; + } + + /* non-LPAE kernels can run anywhere */ + if (!IS_ENABLED(CONFIG_ARM_LPAE)) + return EFI_SUCCESS; + + /* LPAE kernels need compatible hardware */ + block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0); + if (block < 5) { + efi_err("This LPAE kernel is not supported by your CPU\n"); + status = EFI_UNSUPPORTED; + goto drop_table; + } + return EFI_SUCCESS; + +drop_table: + efi_bs_call(install_configuration_table, &cpu_state_guid, NULL); +free_state: + efi_bs_call(free_pool, efi_entry_state); + return status; +} + +void efi_handle_post_ebs_state(void) +{ + get_cpu_state(&efi_entry_state->cpsr_after_ebs, + &efi_entry_state->sctlr_after_ebs); +} + +static efi_guid_t screen_info_guid = LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID; + +struct screen_info *alloc_screen_info(void) +{ + struct screen_info *si; + efi_status_t status; + + /* + * Unlike on arm64, where we can directly fill out the screen_info + * structure from the stub, we need to allocate a buffer to hold + * its contents while we hand over to the kernel proper from the + * decompressor. + */ + status = efi_bs_call(allocate_pool, EFI_RUNTIME_SERVICES_DATA, + sizeof(*si), (void **)&si); + + if (status != EFI_SUCCESS) + return NULL; + + status = efi_bs_call(install_configuration_table, + &screen_info_guid, si); + if (status == EFI_SUCCESS) + return si; + + efi_bs_call(free_pool, si); + return NULL; +} + +void free_screen_info(struct screen_info *si) +{ + if (!si) + return; + + efi_bs_call(install_configuration_table, &screen_info_guid, NULL); + efi_bs_call(free_pool, si); +} + +efi_status_t handle_kernel_image(unsigned long *image_addr, + unsigned long *image_size, + unsigned long *reserve_addr, + unsigned long *reserve_size, + efi_loaded_image_t *image) +{ + const int slack = TEXT_OFFSET - 5 * PAGE_SIZE; + int alloc_size = MAX_UNCOMP_KERNEL_SIZE + EFI_PHYS_ALIGN; + unsigned long alloc_base, kernel_base; + efi_status_t status; + + /* + * Allocate space for the decompressed kernel as low as possible. + * The region should be 16 MiB aligned, but the first 'slack' bytes + * are not used by Linux, so we allow those to be occupied by the + * firmware. + */ + status = efi_low_alloc_above(alloc_size, EFI_PAGE_SIZE, &alloc_base, 0x0); + if (status != EFI_SUCCESS) { + efi_err("Unable to allocate memory for uncompressed kernel.\n"); + return status; + } + + if ((alloc_base % EFI_PHYS_ALIGN) > slack) { + /* + * More than 'slack' bytes are already occupied at the base of + * the allocation, so we need to advance to the next 16 MiB block. + */ + kernel_base = round_up(alloc_base, EFI_PHYS_ALIGN); + efi_info("Free memory starts at 0x%lx, setting kernel_base to 0x%lx\n", + alloc_base, kernel_base); + } else { + kernel_base = round_down(alloc_base, EFI_PHYS_ALIGN); + } + + *reserve_addr = kernel_base + slack; + *reserve_size = MAX_UNCOMP_KERNEL_SIZE; + + /* now free the parts that we will not use */ + if (*reserve_addr > alloc_base) { + efi_bs_call(free_pages, alloc_base, + (*reserve_addr - alloc_base) / EFI_PAGE_SIZE); + alloc_size -= *reserve_addr - alloc_base; + } + efi_bs_call(free_pages, *reserve_addr + MAX_UNCOMP_KERNEL_SIZE, + (alloc_size - MAX_UNCOMP_KERNEL_SIZE) / EFI_PAGE_SIZE); + + *image_addr = kernel_base + TEXT_OFFSET; + *image_size = 0; + + efi_debug("image addr == 0x%lx, reserve_addr == 0x%lx\n", + *image_addr, *reserve_addr); + + return EFI_SUCCESS; +} diff --git a/drivers/firmware/efi/libstub/arm64-stub.c b/drivers/firmware/efi/libstub/arm64-stub.c new file mode 100644 index 000000000..7f4bafcd9 --- /dev/null +++ b/drivers/firmware/efi/libstub/arm64-stub.c @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2013, 2014 Linaro Ltd; <roy.franz@linaro.org> + * + * This file implements the EFI boot stub for the arm64 kernel. + * Adapted from ARM version by Mark Salter <msalter@redhat.com> + */ + + +#include <linux/efi.h> +#include <asm/efi.h> +#include <asm/memory.h> +#include <asm/sections.h> +#include <asm/sysreg.h> + +#include "efistub.h" + +efi_status_t check_platform_features(void) +{ + u64 tg; + + /* UEFI mandates support for 4 KB granularity, no need to check */ + if (IS_ENABLED(CONFIG_ARM64_4K_PAGES)) + return EFI_SUCCESS; + + tg = (read_cpuid(ID_AA64MMFR0_EL1) >> ID_AA64MMFR0_TGRAN_SHIFT) & 0xf; + if (tg < ID_AA64MMFR0_TGRAN_SUPPORTED_MIN || tg > ID_AA64MMFR0_TGRAN_SUPPORTED_MAX) { + if (IS_ENABLED(CONFIG_ARM64_64K_PAGES)) + efi_err("This 64 KB granular kernel is not supported by your CPU\n"); + else + efi_err("This 16 KB granular kernel is not supported by your CPU\n"); + return EFI_UNSUPPORTED; + } + return EFI_SUCCESS; +} + +/* + * Distro versions of GRUB may ignore the BSS allocation entirely (i.e., fail + * to provide space, and fail to zero it). Check for this condition by double + * checking that the first and the last byte of the image are covered by the + * same EFI memory map entry. + */ +static bool check_image_region(u64 base, u64 size) +{ + unsigned long map_size, desc_size, buff_size; + efi_memory_desc_t *memory_map; + struct efi_boot_memmap map; + efi_status_t status; + bool ret = false; + int map_offset; + + map.map = &memory_map; + map.map_size = &map_size; + map.desc_size = &desc_size; + map.desc_ver = NULL; + map.key_ptr = NULL; + map.buff_size = &buff_size; + + status = efi_get_memory_map(&map); + if (status != EFI_SUCCESS) + return false; + + for (map_offset = 0; map_offset < map_size; map_offset += desc_size) { + efi_memory_desc_t *md = (void *)memory_map + map_offset; + u64 end = md->phys_addr + md->num_pages * EFI_PAGE_SIZE; + + /* + * Find the region that covers base, and return whether + * it covers base+size bytes. + */ + if (base >= md->phys_addr && base < end) { + ret = (base + size) <= end; + break; + } + } + + efi_bs_call(free_pool, memory_map); + + return ret; +} + +efi_status_t handle_kernel_image(unsigned long *image_addr, + unsigned long *image_size, + unsigned long *reserve_addr, + unsigned long *reserve_size, + efi_loaded_image_t *image) +{ + efi_status_t status; + unsigned long kernel_size, kernel_memsize = 0; + u32 phys_seed = 0; + + /* + * Although relocatable kernels can fix up the misalignment with + * respect to MIN_KIMG_ALIGN, the resulting virtual text addresses are + * subtly out of sync with those recorded in the vmlinux when kaslr is + * disabled but the image required relocation anyway. Therefore retain + * 2M alignment if KASLR was explicitly disabled, even if it was not + * going to be activated to begin with. + */ + u64 min_kimg_align = efi_nokaslr ? MIN_KIMG_ALIGN : EFI_KIMG_ALIGN; + + if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) { + if (!efi_nokaslr) { + status = efi_get_random_bytes(sizeof(phys_seed), + (u8 *)&phys_seed); + if (status == EFI_NOT_FOUND) { + efi_info("EFI_RNG_PROTOCOL unavailable, KASLR will be disabled\n"); + efi_nokaslr = true; + } else if (status != EFI_SUCCESS) { + efi_err("efi_get_random_bytes() failed (0x%lx), KASLR will be disabled\n", + status); + efi_nokaslr = true; + } + } else { + efi_info("KASLR disabled on kernel command line\n"); + } + } + + if (image->image_base != _text) + efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n"); + + if (!IS_ALIGNED((u64)_text, SEGMENT_ALIGN)) + efi_err("FIRMWARE BUG: kernel image not aligned on %dk boundary\n", + SEGMENT_ALIGN >> 10); + + kernel_size = _edata - _text; + kernel_memsize = kernel_size + (_end - _edata); + *reserve_size = kernel_memsize; + + if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && phys_seed != 0) { + /* + * If KASLR is enabled, and we have some randomness available, + * locate the kernel at a randomized offset in physical memory. + */ + status = efi_random_alloc(*reserve_size, min_kimg_align, + reserve_addr, phys_seed); + } else { + status = EFI_OUT_OF_RESOURCES; + } + + if (status != EFI_SUCCESS) { + if (!check_image_region((u64)_text, kernel_memsize)) { + efi_err("FIRMWARE BUG: Image BSS overlaps adjacent EFI memory region\n"); + } else if (IS_ALIGNED((u64)_text, min_kimg_align)) { + /* + * Just execute from wherever we were loaded by the + * UEFI PE/COFF loader if the alignment is suitable. + */ + *image_addr = (u64)_text; + *reserve_size = 0; + return EFI_SUCCESS; + } + + status = efi_allocate_pages_aligned(*reserve_size, reserve_addr, + ULONG_MAX, min_kimg_align); + + if (status != EFI_SUCCESS) { + efi_err("Failed to relocate kernel\n"); + *reserve_size = 0; + return status; + } + } + + *image_addr = *reserve_addr; + memcpy((void *)*image_addr, _text, kernel_size); + + return EFI_SUCCESS; +} diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c new file mode 100644 index 000000000..aa8da0a49 --- /dev/null +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c @@ -0,0 +1,704 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Helper functions used by the EFI stub on multiple + * architectures. This should be #included by the EFI stub + * implementation files. + * + * Copyright 2011 Intel Corporation; author Matt Fleming + */ + +#include <stdarg.h> + +#include <linux/ctype.h> +#include <linux/efi.h> +#include <linux/kernel.h> +#include <linux/printk.h> /* For CONSOLE_LOGLEVEL_* */ +#include <asm/efi.h> +#include <asm/setup.h> + +#include "efistub.h" + +bool efi_nochunk; +bool efi_nokaslr = !IS_ENABLED(CONFIG_RANDOMIZE_BASE); +bool efi_noinitrd; +int efi_loglevel = CONSOLE_LOGLEVEL_DEFAULT; +bool efi_novamap; + +static bool efi_nosoftreserve; +static bool efi_disable_pci_dma = IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA); + +bool __pure __efi_soft_reserve_enabled(void) +{ + return !efi_nosoftreserve; +} + +/** + * efi_char16_puts() - Write a UCS-2 encoded string to the console + * @str: UCS-2 encoded string + */ +void efi_char16_puts(efi_char16_t *str) +{ + efi_call_proto(efi_table_attr(efi_system_table, con_out), + output_string, str); +} + +static +u32 utf8_to_utf32(const u8 **s8) +{ + u32 c32; + u8 c0, cx; + size_t clen, i; + + c0 = cx = *(*s8)++; + /* + * The position of the most-significant 0 bit gives us the length of + * a multi-octet encoding. + */ + for (clen = 0; cx & 0x80; ++clen) + cx <<= 1; + /* + * If the 0 bit is in position 8, this is a valid single-octet + * encoding. If the 0 bit is in position 7 or positions 1-3, the + * encoding is invalid. + * In either case, we just return the first octet. + */ + if (clen < 2 || clen > 4) + return c0; + /* Get the bits from the first octet. */ + c32 = cx >> clen--; + for (i = 0; i < clen; ++i) { + /* Trailing octets must have 10 in most significant bits. */ + cx = (*s8)[i] ^ 0x80; + if (cx & 0xc0) + return c0; + c32 = (c32 << 6) | cx; + } + /* + * Check for validity: + * - The character must be in the Unicode range. + * - It must not be a surrogate. + * - It must be encoded using the correct number of octets. + */ + if (c32 > 0x10ffff || + (c32 & 0xf800) == 0xd800 || + clen != (c32 >= 0x80) + (c32 >= 0x800) + (c32 >= 0x10000)) + return c0; + *s8 += clen; + return c32; +} + +/** + * efi_puts() - Write a UTF-8 encoded string to the console + * @str: UTF-8 encoded string + */ +void efi_puts(const char *str) +{ + efi_char16_t buf[128]; + size_t pos = 0, lim = ARRAY_SIZE(buf); + const u8 *s8 = (const u8 *)str; + u32 c32; + + while (*s8) { + if (*s8 == '\n') + buf[pos++] = L'\r'; + c32 = utf8_to_utf32(&s8); + if (c32 < 0x10000) { + /* Characters in plane 0 use a single word. */ + buf[pos++] = c32; + } else { + /* + * Characters in other planes encode into a surrogate + * pair. + */ + buf[pos++] = (0xd800 - (0x10000 >> 10)) + (c32 >> 10); + buf[pos++] = 0xdc00 + (c32 & 0x3ff); + } + if (*s8 == '\0' || pos >= lim - 2) { + buf[pos] = L'\0'; + efi_char16_puts(buf); + pos = 0; + } + } +} + +/** + * efi_printk() - Print a kernel message + * @fmt: format string + * + * The first letter of the format string is used to determine the logging level + * of the message. If the level is less then the current EFI logging level, the + * message is suppressed. The message will be truncated to 255 bytes. + * + * Return: number of printed characters + */ +int efi_printk(const char *fmt, ...) +{ + char printf_buf[256]; + va_list args; + int printed; + int loglevel = printk_get_level(fmt); + + switch (loglevel) { + case '0' ... '9': + loglevel -= '0'; + break; + default: + /* + * Use loglevel -1 for cases where we just want to print to + * the screen. + */ + loglevel = -1; + break; + } + + if (loglevel >= efi_loglevel) + return 0; + + if (loglevel >= 0) + efi_puts("EFI stub: "); + + fmt = printk_skip_level(fmt); + + va_start(args, fmt); + printed = vsnprintf(printf_buf, sizeof(printf_buf), fmt, args); + va_end(args); + + efi_puts(printf_buf); + if (printed >= sizeof(printf_buf)) { + efi_puts("[Message truncated]\n"); + return -1; + } + + return printed; +} + +/** + * efi_parse_options() - Parse EFI command line options + * @cmdline: kernel command line + * + * Parse the ASCII string @cmdline for EFI options, denoted by the efi= + * option, e.g. efi=nochunk. + * + * It should be noted that efi= is parsed in two very different + * environments, first in the early boot environment of the EFI boot + * stub, and subsequently during the kernel boot. + * + * Return: status code + */ +efi_status_t efi_parse_options(char const *cmdline) +{ + size_t len; + efi_status_t status; + char *str, *buf; + + if (!cmdline) + return EFI_SUCCESS; + + len = strnlen(cmdline, COMMAND_LINE_SIZE - 1) + 1; + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, len, (void **)&buf); + if (status != EFI_SUCCESS) + return status; + + memcpy(buf, cmdline, len - 1); + buf[len - 1] = '\0'; + str = skip_spaces(buf); + + while (*str) { + char *param, *val; + + str = next_arg(str, ¶m, &val); + if (!val && !strcmp(param, "--")) + break; + + if (!strcmp(param, "nokaslr")) { + efi_nokaslr = true; + } else if (!strcmp(param, "quiet")) { + efi_loglevel = CONSOLE_LOGLEVEL_QUIET; + } else if (!strcmp(param, "noinitrd")) { + efi_noinitrd = true; + } else if (!strcmp(param, "efi") && val) { + efi_nochunk = parse_option_str(val, "nochunk"); + efi_novamap = parse_option_str(val, "novamap"); + + efi_nosoftreserve = IS_ENABLED(CONFIG_EFI_SOFT_RESERVE) && + parse_option_str(val, "nosoftreserve"); + + if (parse_option_str(val, "disable_early_pci_dma")) + efi_disable_pci_dma = true; + if (parse_option_str(val, "no_disable_early_pci_dma")) + efi_disable_pci_dma = false; + if (parse_option_str(val, "debug")) + efi_loglevel = CONSOLE_LOGLEVEL_DEBUG; + } else if (!strcmp(param, "video") && + val && strstarts(val, "efifb:")) { + efi_parse_option_graphics(val + strlen("efifb:")); + } + } + efi_bs_call(free_pool, buf); + return EFI_SUCCESS; +} + +/* + * The EFI_LOAD_OPTION descriptor has the following layout: + * u32 Attributes; + * u16 FilePathListLength; + * u16 Description[]; + * efi_device_path_protocol_t FilePathList[]; + * u8 OptionalData[]; + * + * This function validates and unpacks the variable-size data fields. + */ +static +bool efi_load_option_unpack(efi_load_option_unpacked_t *dest, + const efi_load_option_t *src, size_t size) +{ + const void *pos; + u16 c; + efi_device_path_protocol_t header; + const efi_char16_t *description; + const efi_device_path_protocol_t *file_path_list; + + if (size < offsetof(efi_load_option_t, variable_data)) + return false; + pos = src->variable_data; + size -= offsetof(efi_load_option_t, variable_data); + + if ((src->attributes & ~EFI_LOAD_OPTION_MASK) != 0) + return false; + + /* Scan description. */ + description = pos; + do { + if (size < sizeof(c)) + return false; + c = *(const u16 *)pos; + pos += sizeof(c); + size -= sizeof(c); + } while (c != L'\0'); + + /* Scan file_path_list. */ + file_path_list = pos; + do { + if (size < sizeof(header)) + return false; + header = *(const efi_device_path_protocol_t *)pos; + if (header.length < sizeof(header)) + return false; + if (size < header.length) + return false; + pos += header.length; + size -= header.length; + } while ((header.type != EFI_DEV_END_PATH && header.type != EFI_DEV_END_PATH2) || + (header.sub_type != EFI_DEV_END_ENTIRE)); + if (pos != (const void *)file_path_list + src->file_path_list_length) + return false; + + dest->attributes = src->attributes; + dest->file_path_list_length = src->file_path_list_length; + dest->description = description; + dest->file_path_list = file_path_list; + dest->optional_data_size = size; + dest->optional_data = size ? pos : NULL; + + return true; +} + +/* + * At least some versions of Dell firmware pass the entire contents of the + * Boot#### variable, i.e. the EFI_LOAD_OPTION descriptor, rather than just the + * OptionalData field. + * + * Detect this case and extract OptionalData. + */ +void efi_apply_loadoptions_quirk(const void **load_options, int *load_options_size) +{ + const efi_load_option_t *load_option = *load_options; + efi_load_option_unpacked_t load_option_unpacked; + + if (!IS_ENABLED(CONFIG_X86)) + return; + if (!load_option) + return; + if (*load_options_size < sizeof(*load_option)) + return; + if ((load_option->attributes & ~EFI_LOAD_OPTION_BOOT_MASK) != 0) + return; + + if (!efi_load_option_unpack(&load_option_unpacked, load_option, *load_options_size)) + return; + + efi_warn_once(FW_BUG "LoadOptions is an EFI_LOAD_OPTION descriptor\n"); + efi_warn_once(FW_BUG "Using OptionalData as a workaround\n"); + + *load_options = load_option_unpacked.optional_data; + *load_options_size = load_option_unpacked.optional_data_size; +} + +/* + * Convert the unicode UEFI command line to ASCII to pass to kernel. + * Size of memory allocated return in *cmd_line_len. + * Returns NULL on error. + */ +char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len) +{ + const u16 *s2; + unsigned long cmdline_addr = 0; + int options_chars = efi_table_attr(image, load_options_size); + const u16 *options = efi_table_attr(image, load_options); + int options_bytes = 0, safe_options_bytes = 0; /* UTF-8 bytes */ + bool in_quote = false; + efi_status_t status; + + efi_apply_loadoptions_quirk((const void **)&options, &options_chars); + options_chars /= sizeof(*options); + + if (options) { + s2 = options; + while (options_bytes < COMMAND_LINE_SIZE && options_chars--) { + u16 c = *s2++; + + if (c < 0x80) { + if (c == L'\0' || c == L'\n') + break; + if (c == L'"') + in_quote = !in_quote; + else if (!in_quote && isspace((char)c)) + safe_options_bytes = options_bytes; + + options_bytes++; + continue; + } + + /* + * Get the number of UTF-8 bytes corresponding to a + * UTF-16 character. + * The first part handles everything in the BMP. + */ + options_bytes += 2 + (c >= 0x800); + /* + * Add one more byte for valid surrogate pairs. Invalid + * surrogates will be replaced with 0xfffd and take up + * only 3 bytes. + */ + if ((c & 0xfc00) == 0xd800) { + /* + * If the very last word is a high surrogate, + * we must ignore it since we can't access the + * low surrogate. + */ + if (!options_chars) { + options_bytes -= 3; + } else if ((*s2 & 0xfc00) == 0xdc00) { + options_bytes++; + options_chars--; + s2++; + } + } + } + if (options_bytes >= COMMAND_LINE_SIZE) { + options_bytes = safe_options_bytes; + efi_err("Command line is too long: truncated to %d bytes\n", + options_bytes); + } + } + + options_bytes++; /* NUL termination */ + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, options_bytes, + (void **)&cmdline_addr); + if (status != EFI_SUCCESS) + return NULL; + + snprintf((char *)cmdline_addr, options_bytes, "%.*ls", + options_bytes - 1, options); + + *cmd_line_len = options_bytes; + return (char *)cmdline_addr; +} + +/** + * efi_exit_boot_services() - Exit boot services + * @handle: handle of the exiting image + * @map: pointer to receive the memory map + * @priv: argument to be passed to @priv_func + * @priv_func: function to process the memory map before exiting boot services + * + * Handle calling ExitBootServices according to the requirements set out by the + * spec. Obtains the current memory map, and returns that info after calling + * ExitBootServices. The client must specify a function to perform any + * processing of the memory map data prior to ExitBootServices. A client + * specific structure may be passed to the function via priv. The client + * function may be called multiple times. + * + * Return: status code + */ +efi_status_t efi_exit_boot_services(void *handle, + struct efi_boot_memmap *map, + void *priv, + efi_exit_boot_map_processing priv_func) +{ + efi_status_t status; + + status = efi_get_memory_map(map); + + if (status != EFI_SUCCESS) + goto fail; + + status = priv_func(map, priv); + if (status != EFI_SUCCESS) + goto free_map; + + if (efi_disable_pci_dma) + efi_pci_disable_bridge_busmaster(); + + status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); + + if (status == EFI_INVALID_PARAMETER) { + /* + * The memory map changed between efi_get_memory_map() and + * exit_boot_services(). Per the UEFI Spec v2.6, Section 6.4: + * EFI_BOOT_SERVICES.ExitBootServices we need to get the + * updated map, and try again. The spec implies one retry + * should be sufficent, which is confirmed against the EDK2 + * implementation. Per the spec, we can only invoke + * get_memory_map() and exit_boot_services() - we cannot alloc + * so efi_get_memory_map() cannot be used, and we must reuse + * the buffer. For all practical purposes, the headroom in the + * buffer should account for any changes in the map so the call + * to get_memory_map() is expected to succeed here. + */ + *map->map_size = *map->buff_size; + status = efi_bs_call(get_memory_map, + map->map_size, + *map->map, + map->key_ptr, + map->desc_size, + map->desc_ver); + + /* exit_boot_services() was called, thus cannot free */ + if (status != EFI_SUCCESS) + goto fail; + + status = priv_func(map, priv); + /* exit_boot_services() was called, thus cannot free */ + if (status != EFI_SUCCESS) + goto fail; + + status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); + } + + /* exit_boot_services() was called, thus cannot free */ + if (status != EFI_SUCCESS) + goto fail; + + return EFI_SUCCESS; + +free_map: + efi_bs_call(free_pool, *map->map); +fail: + return status; +} + +/** + * get_efi_config_table() - retrieve UEFI configuration table + * @guid: GUID of the configuration table to be retrieved + * Return: pointer to the configuration table or NULL + */ +void *get_efi_config_table(efi_guid_t guid) +{ + unsigned long tables = efi_table_attr(efi_system_table, tables); + int nr_tables = efi_table_attr(efi_system_table, nr_tables); + int i; + + for (i = 0; i < nr_tables; i++) { + efi_config_table_t *t = (void *)tables; + + if (efi_guidcmp(t->guid, guid) == 0) + return efi_table_attr(t, table); + + tables += efi_is_native() ? sizeof(efi_config_table_t) + : sizeof(efi_config_table_32_t); + } + return NULL; +} + +/* + * The LINUX_EFI_INITRD_MEDIA_GUID vendor media device path below provides a way + * for the firmware or bootloader to expose the initrd data directly to the stub + * via the trivial LoadFile2 protocol, which is defined in the UEFI spec, and is + * very easy to implement. It is a simple Linux initrd specific conduit between + * kernel and firmware, allowing us to put the EFI stub (being part of the + * kernel) in charge of where and when to load the initrd, while leaving it up + * to the firmware to decide whether it needs to expose its filesystem hierarchy + * via EFI protocols. + */ +static const struct { + struct efi_vendor_dev_path vendor; + struct efi_generic_dev_path end; +} __packed initrd_dev_path = { + { + { + EFI_DEV_MEDIA, + EFI_DEV_MEDIA_VENDOR, + sizeof(struct efi_vendor_dev_path), + }, + LINUX_EFI_INITRD_MEDIA_GUID + }, { + EFI_DEV_END_PATH, + EFI_DEV_END_ENTIRE, + sizeof(struct efi_generic_dev_path) + } +}; + +/** + * efi_load_initrd_dev_path() - load the initrd from the Linux initrd device path + * @load_addr: pointer to store the address where the initrd was loaded + * @load_size: pointer to store the size of the loaded initrd + * @max: upper limit for the initrd memory allocation + * + * Return: + * * %EFI_SUCCESS if the initrd was loaded successfully, in which + * case @load_addr and @load_size are assigned accordingly + * * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd device path + * * %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL + * * %EFI_OUT_OF_RESOURCES if memory allocation failed + * * %EFI_LOAD_ERROR in all other cases + */ +static +efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr, + unsigned long *load_size, + unsigned long max) +{ + efi_guid_t lf2_proto_guid = EFI_LOAD_FILE2_PROTOCOL_GUID; + efi_device_path_protocol_t *dp; + efi_load_file2_protocol_t *lf2; + unsigned long initrd_addr; + unsigned long initrd_size; + efi_handle_t handle; + efi_status_t status; + + dp = (efi_device_path_protocol_t *)&initrd_dev_path; + status = efi_bs_call(locate_device_path, &lf2_proto_guid, &dp, &handle); + if (status != EFI_SUCCESS) + return status; + + status = efi_bs_call(handle_protocol, handle, &lf2_proto_guid, + (void **)&lf2); + if (status != EFI_SUCCESS) + return status; + + status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, NULL); + if (status != EFI_BUFFER_TOO_SMALL) + return EFI_LOAD_ERROR; + + status = efi_allocate_pages(initrd_size, &initrd_addr, max); + if (status != EFI_SUCCESS) + return status; + + status = efi_call_proto(lf2, load_file, dp, false, &initrd_size, + (void *)initrd_addr); + if (status != EFI_SUCCESS) { + efi_free(initrd_size, initrd_addr); + return EFI_LOAD_ERROR; + } + + *load_addr = initrd_addr; + *load_size = initrd_size; + return EFI_SUCCESS; +} + +static +efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image, + unsigned long *load_addr, + unsigned long *load_size, + unsigned long soft_limit, + unsigned long hard_limit) +{ + if (!IS_ENABLED(CONFIG_EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER) || + (IS_ENABLED(CONFIG_X86) && (!efi_is_native() || image == NULL))) { + *load_addr = *load_size = 0; + return EFI_SUCCESS; + } + + return handle_cmdline_files(image, L"initrd=", sizeof(L"initrd=") - 2, + soft_limit, hard_limit, + load_addr, load_size); +} + +/** + * efi_load_initrd() - Load initial RAM disk + * @image: EFI loaded image protocol + * @load_addr: pointer to loaded initrd + * @load_size: size of loaded initrd + * @soft_limit: preferred size of allocated memory for loading the initrd + * @hard_limit: minimum size of allocated memory + * + * Return: status code + */ +efi_status_t efi_load_initrd(efi_loaded_image_t *image, + unsigned long *load_addr, + unsigned long *load_size, + unsigned long soft_limit, + unsigned long hard_limit) +{ + efi_status_t status; + + if (!load_addr || !load_size) + return EFI_INVALID_PARAMETER; + + status = efi_load_initrd_dev_path(load_addr, load_size, hard_limit); + if (status == EFI_SUCCESS) { + efi_info("Loaded initrd from LINUX_EFI_INITRD_MEDIA_GUID device path\n"); + } else if (status == EFI_NOT_FOUND) { + status = efi_load_initrd_cmdline(image, load_addr, load_size, + soft_limit, hard_limit); + if (status == EFI_SUCCESS && *load_size > 0) + efi_info("Loaded initrd from command line option\n"); + } + + return status; +} + +/** + * efi_wait_for_key() - Wait for key stroke + * @usec: number of microseconds to wait for key stroke + * @key: key entered + * + * Wait for up to @usec microseconds for a key stroke. + * + * Return: status code, EFI_SUCCESS if key received + */ +efi_status_t efi_wait_for_key(unsigned long usec, efi_input_key_t *key) +{ + efi_event_t events[2], timer; + unsigned long index; + efi_simple_text_input_protocol_t *con_in; + efi_status_t status; + + con_in = efi_table_attr(efi_system_table, con_in); + if (!con_in) + return EFI_UNSUPPORTED; + efi_set_event_at(events, 0, efi_table_attr(con_in, wait_for_key)); + + status = efi_bs_call(create_event, EFI_EVT_TIMER, 0, NULL, NULL, &timer); + if (status != EFI_SUCCESS) + return status; + + status = efi_bs_call(set_timer, timer, EfiTimerRelative, + EFI_100NSEC_PER_USEC * usec); + if (status != EFI_SUCCESS) + return status; + efi_set_event_at(events, 1, timer); + + status = efi_bs_call(wait_for_event, 2, events, &index); + if (status == EFI_SUCCESS) { + if (index == 0) + status = efi_call_proto(con_in, read_keystroke, key); + else + status = EFI_TIMEOUT; + } + + efi_bs_call(close_event, timer); + + return status; +} diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c new file mode 100644 index 000000000..0ab439c53 --- /dev/null +++ b/drivers/firmware/efi/libstub/efi-stub.c @@ -0,0 +1,380 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * EFI stub implementation that is shared by arm and arm64 architectures. + * This should be #included by the EFI stub implementation files. + * + * Copyright (C) 2013,2014 Linaro Limited + * Roy Franz <roy.franz@linaro.org + * Copyright (C) 2013 Red Hat, Inc. + * Mark Salter <msalter@redhat.com> + */ + +#include <linux/efi.h> +#include <linux/libfdt.h> +#include <asm/efi.h> + +#include "efistub.h" + +/* + * This is the base address at which to start allocating virtual memory ranges + * for UEFI Runtime Services. + * + * For ARM/ARM64: + * This is in the low TTBR0 range so that we can use + * any allocation we choose, and eliminate the risk of a conflict after kexec. + * The value chosen is the largest non-zero power of 2 suitable for this purpose + * both on 32-bit and 64-bit ARM CPUs, to maximize the likelihood that it can + * be mapped efficiently. + * Since 32-bit ARM could potentially execute with a 1G/3G user/kernel split, + * map everything below 1 GB. (512 MB is a reasonable upper bound for the + * entire footprint of the UEFI runtime services memory regions) + * + * For RISC-V: + * There is no specific reason for which, this address (512MB) can't be used + * EFI runtime virtual address for RISC-V. It also helps to use EFI runtime + * services on both RV32/RV64. Keep the same runtime virtual address for RISC-V + * as well to minimize the code churn. + */ +#define EFI_RT_VIRTUAL_BASE SZ_512M +#define EFI_RT_VIRTUAL_SIZE SZ_512M + +#ifdef CONFIG_ARM64 +# define EFI_RT_VIRTUAL_LIMIT DEFAULT_MAP_WINDOW_64 +#else +# define EFI_RT_VIRTUAL_LIMIT TASK_SIZE +#endif + +static u64 virtmap_base = EFI_RT_VIRTUAL_BASE; +static bool flat_va_mapping; + +const efi_system_table_t *efi_system_table; + +static struct screen_info *setup_graphics(void) +{ + efi_guid_t gop_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; + efi_status_t status; + unsigned long size; + void **gop_handle = NULL; + struct screen_info *si = NULL; + + size = 0; + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + &gop_proto, NULL, &size, gop_handle); + if (status == EFI_BUFFER_TOO_SMALL) { + si = alloc_screen_info(); + if (!si) + return NULL; + status = efi_setup_gop(si, &gop_proto, size); + if (status != EFI_SUCCESS) { + free_screen_info(si); + return NULL; + } + } + return si; +} + +static void install_memreserve_table(void) +{ + struct linux_efi_memreserve *rsv; + efi_guid_t memreserve_table_guid = LINUX_EFI_MEMRESERVE_TABLE_GUID; + efi_status_t status; + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, sizeof(*rsv), + (void **)&rsv); + if (status != EFI_SUCCESS) { + efi_err("Failed to allocate memreserve entry!\n"); + return; + } + + rsv->next = 0; + rsv->size = 0; + atomic_set(&rsv->count, 0); + + status = efi_bs_call(install_configuration_table, + &memreserve_table_guid, rsv); + if (status != EFI_SUCCESS) + efi_err("Failed to install memreserve config table!\n"); +} + +static u32 get_supported_rt_services(void) +{ + const efi_rt_properties_table_t *rt_prop_table; + u32 supported = EFI_RT_SUPPORTED_ALL; + + rt_prop_table = get_efi_config_table(EFI_RT_PROPERTIES_TABLE_GUID); + if (rt_prop_table) + supported &= rt_prop_table->runtime_services_supported; + + return supported; +} + +/* + * EFI entry point for the arm/arm64 EFI stubs. This is the entrypoint + * that is described in the PE/COFF header. Most of the code is the same + * for both archictectures, with the arch-specific code provided in the + * handle_kernel_image() function. + */ +efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, + efi_system_table_t *sys_table_arg) +{ + efi_loaded_image_t *image; + efi_status_t status; + unsigned long image_addr; + unsigned long image_size = 0; + /* addr/point and size pairs for memory management*/ + unsigned long initrd_addr = 0; + unsigned long initrd_size = 0; + unsigned long fdt_addr = 0; /* Original DTB */ + unsigned long fdt_size = 0; + char *cmdline_ptr = NULL; + int cmdline_size = 0; + efi_guid_t loaded_image_proto = LOADED_IMAGE_PROTOCOL_GUID; + unsigned long reserve_addr = 0; + unsigned long reserve_size = 0; + enum efi_secureboot_mode secure_boot; + struct screen_info *si; + efi_properties_table_t *prop_tbl; + unsigned long max_addr; + + efi_system_table = sys_table_arg; + + /* Check if we were booted by the EFI firmware */ + if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) { + status = EFI_INVALID_PARAMETER; + goto fail; + } + + status = check_platform_features(); + if (status != EFI_SUCCESS) + goto fail; + + /* + * Get a handle to the loaded image protocol. This is used to get + * information about the running image, such as size and the command + * line. + */ + status = efi_system_table->boottime->handle_protocol(handle, + &loaded_image_proto, (void *)&image); + if (status != EFI_SUCCESS) { + efi_err("Failed to get loaded image protocol\n"); + goto fail; + } + + /* + * Get the command line from EFI, using the LOADED_IMAGE + * protocol. We are going to copy the command line into the + * device tree, so this can be allocated anywhere. + */ + cmdline_ptr = efi_convert_cmdline(image, &cmdline_size); + if (!cmdline_ptr) { + efi_err("getting command line via LOADED_IMAGE_PROTOCOL\n"); + status = EFI_OUT_OF_RESOURCES; + goto fail; + } + + if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) || + IS_ENABLED(CONFIG_CMDLINE_FORCE) || + cmdline_size == 0) { + status = efi_parse_options(CONFIG_CMDLINE); + if (status != EFI_SUCCESS) { + efi_err("Failed to parse options\n"); + goto fail_free_cmdline; + } + } + + if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && cmdline_size > 0) { + status = efi_parse_options(cmdline_ptr); + if (status != EFI_SUCCESS) { + efi_err("Failed to parse options\n"); + goto fail_free_cmdline; + } + } + + efi_info("Booting Linux Kernel...\n"); + + si = setup_graphics(); + + status = handle_kernel_image(&image_addr, &image_size, + &reserve_addr, + &reserve_size, + image); + if (status != EFI_SUCCESS) { + efi_err("Failed to relocate kernel\n"); + goto fail_free_screeninfo; + } + + efi_retrieve_tpm2_eventlog(); + + /* Ask the firmware to clear memory on unclean shutdown */ + efi_enable_reset_attack_mitigation(); + + secure_boot = efi_get_secureboot(); + + /* + * Unauthenticated device tree data is a security hazard, so ignore + * 'dtb=' unless UEFI Secure Boot is disabled. We assume that secure + * boot is enabled if we can't determine its state. + */ + if (!IS_ENABLED(CONFIG_EFI_ARMSTUB_DTB_LOADER) || + secure_boot != efi_secureboot_mode_disabled) { + if (strstr(cmdline_ptr, "dtb=")) + efi_err("Ignoring DTB from command line.\n"); + } else { + status = efi_load_dtb(image, &fdt_addr, &fdt_size); + + if (status != EFI_SUCCESS) { + efi_err("Failed to load device tree!\n"); + goto fail_free_image; + } + } + + if (fdt_addr) { + efi_info("Using DTB from command line\n"); + } else { + /* Look for a device tree configuration table entry. */ + fdt_addr = (uintptr_t)get_fdt(&fdt_size); + if (fdt_addr) + efi_info("Using DTB from configuration table\n"); + } + + if (!fdt_addr) + efi_info("Generating empty DTB\n"); + + if (!efi_noinitrd) { + max_addr = efi_get_max_initrd_addr(image_addr); + status = efi_load_initrd(image, &initrd_addr, &initrd_size, + ULONG_MAX, max_addr); + if (status != EFI_SUCCESS) + efi_err("Failed to load initrd!\n"); + } + + efi_random_get_seed(); + + /* + * If the NX PE data feature is enabled in the properties table, we + * should take care not to create a virtual mapping that changes the + * relative placement of runtime services code and data regions, as + * they may belong to the same PE/COFF executable image in memory. + * The easiest way to achieve that is to simply use a 1:1 mapping. + */ + prop_tbl = get_efi_config_table(EFI_PROPERTIES_TABLE_GUID); + flat_va_mapping = prop_tbl && + (prop_tbl->memory_protection_attribute & + EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA); + + /* force efi_novamap if SetVirtualAddressMap() is unsupported */ + efi_novamap |= !(get_supported_rt_services() & + EFI_RT_SUPPORTED_SET_VIRTUAL_ADDRESS_MAP); + + /* hibernation expects the runtime regions to stay in the same place */ + if (!IS_ENABLED(CONFIG_HIBERNATION) && !efi_nokaslr && !flat_va_mapping) { + /* + * Randomize the base of the UEFI runtime services region. + * Preserve the 2 MB alignment of the region by taking a + * shift of 21 bit positions into account when scaling + * the headroom value using a 32-bit random value. + */ + static const u64 headroom = EFI_RT_VIRTUAL_LIMIT - + EFI_RT_VIRTUAL_BASE - + EFI_RT_VIRTUAL_SIZE; + u32 rnd; + + status = efi_get_random_bytes(sizeof(rnd), (u8 *)&rnd); + if (status == EFI_SUCCESS) { + virtmap_base = EFI_RT_VIRTUAL_BASE + + (((headroom >> 21) * rnd) >> (32 - 21)); + } + } + + install_memreserve_table(); + + status = allocate_new_fdt_and_exit_boot(handle, &fdt_addr, + efi_get_max_fdt_addr(image_addr), + initrd_addr, initrd_size, + cmdline_ptr, fdt_addr, fdt_size); + if (status != EFI_SUCCESS) + goto fail_free_initrd; + + if (IS_ENABLED(CONFIG_ARM)) + efi_handle_post_ebs_state(); + + efi_enter_kernel(image_addr, fdt_addr, fdt_totalsize((void *)fdt_addr)); + /* not reached */ + +fail_free_initrd: + efi_err("Failed to update FDT and exit boot services\n"); + + efi_free(initrd_size, initrd_addr); + efi_free(fdt_size, fdt_addr); + +fail_free_image: + efi_free(image_size, image_addr); + efi_free(reserve_size, reserve_addr); +fail_free_screeninfo: + free_screen_info(si); +fail_free_cmdline: + efi_bs_call(free_pool, cmdline_ptr); +fail: + return status; +} + +/* + * efi_get_virtmap() - create a virtual mapping for the EFI memory map + * + * This function populates the virt_addr fields of all memory region descriptors + * in @memory_map whose EFI_MEMORY_RUNTIME attribute is set. Those descriptors + * are also copied to @runtime_map, and their total count is returned in @count. + */ +void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size, + unsigned long desc_size, efi_memory_desc_t *runtime_map, + int *count) +{ + u64 efi_virt_base = virtmap_base; + efi_memory_desc_t *in, *out = runtime_map; + int l; + + for (l = 0; l < map_size; l += desc_size) { + u64 paddr, size; + + in = (void *)memory_map + l; + if (!(in->attribute & EFI_MEMORY_RUNTIME)) + continue; + + paddr = in->phys_addr; + size = in->num_pages * EFI_PAGE_SIZE; + + in->virt_addr = in->phys_addr; + if (efi_novamap) { + continue; + } + + /* + * Make the mapping compatible with 64k pages: this allows + * a 4k page size kernel to kexec a 64k page size kernel and + * vice versa. + */ + if (!flat_va_mapping) { + + paddr = round_down(in->phys_addr, SZ_64K); + size += in->phys_addr - paddr; + + /* + * Avoid wasting memory on PTEs by choosing a virtual + * base that is compatible with section mappings if this + * region has the appropriate size and physical + * alignment. (Sections are 2 MB on 4k granule kernels) + */ + if (IS_ALIGNED(in->phys_addr, SZ_2M) && size >= SZ_2M) + efi_virt_base = round_up(efi_virt_base, SZ_2M); + else + efi_virt_base = round_up(efi_virt_base, SZ_64K); + + in->virt_addr += efi_virt_base - paddr; + efi_virt_base += size; + } + + memcpy(out, in, desc_size); + out = (void *)out + desc_size; + ++*count; + } +} diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h new file mode 100644 index 000000000..c5e0c6e99 --- /dev/null +++ b/drivers/firmware/efi/libstub/efistub.h @@ -0,0 +1,853 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef _DRIVERS_FIRMWARE_EFI_EFISTUB_H +#define _DRIVERS_FIRMWARE_EFI_EFISTUB_H + +#include <linux/compiler.h> +#include <linux/efi.h> +#include <linux/kernel.h> +#include <linux/kern_levels.h> +#include <linux/types.h> +#include <asm/efi.h> + +/* + * __init annotations should not be used in the EFI stub, since the code is + * either included in the decompressor (x86, ARM) where they have no effect, + * or the whole stub is __init annotated at the section level (arm64), by + * renaming the sections, in which case the __init annotation will be + * redundant, and will result in section names like .init.init.text, and our + * linker script does not expect that. + */ +#undef __init + +/* + * Allow the platform to override the allocation granularity: this allows + * systems that have the capability to run with a larger page size to deal + * with the allocations for initrd and fdt more efficiently. + */ +#ifndef EFI_ALLOC_ALIGN +#define EFI_ALLOC_ALIGN EFI_PAGE_SIZE +#endif + +extern bool efi_nochunk; +extern bool efi_nokaslr; +extern bool efi_noinitrd; +extern int efi_loglevel; +extern bool efi_novamap; + +extern const efi_system_table_t *efi_system_table; + +efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, + efi_system_table_t *sys_table_arg); + +#ifndef ARCH_HAS_EFISTUB_WRAPPERS + +#define efi_is_native() (true) +#define efi_bs_call(func, ...) efi_system_table->boottime->func(__VA_ARGS__) +#define efi_rt_call(func, ...) efi_system_table->runtime->func(__VA_ARGS__) +#define efi_table_attr(inst, attr) (inst->attr) +#define efi_call_proto(inst, func, ...) inst->func(inst, ##__VA_ARGS__) + +#endif + +#define efi_info(fmt, ...) \ + efi_printk(KERN_INFO fmt, ##__VA_ARGS__) +#define efi_warn(fmt, ...) \ + efi_printk(KERN_WARNING "WARNING: " fmt, ##__VA_ARGS__) +#define efi_err(fmt, ...) \ + efi_printk(KERN_ERR "ERROR: " fmt, ##__VA_ARGS__) +#define efi_debug(fmt, ...) \ + efi_printk(KERN_DEBUG "DEBUG: " fmt, ##__VA_ARGS__) + +#define efi_printk_once(fmt, ...) \ +({ \ + static bool __print_once; \ + bool __ret_print_once = !__print_once; \ + \ + if (!__print_once) { \ + __print_once = true; \ + efi_printk(fmt, ##__VA_ARGS__); \ + } \ + __ret_print_once; \ +}) + +#define efi_info_once(fmt, ...) \ + efi_printk_once(KERN_INFO fmt, ##__VA_ARGS__) +#define efi_warn_once(fmt, ...) \ + efi_printk_once(KERN_WARNING "WARNING: " fmt, ##__VA_ARGS__) +#define efi_err_once(fmt, ...) \ + efi_printk_once(KERN_ERR "ERROR: " fmt, ##__VA_ARGS__) +#define efi_debug_once(fmt, ...) \ + efi_printk_once(KERN_DEBUG "DEBUG: " fmt, ##__VA_ARGS__) + +/* Helper macros for the usual case of using simple C variables: */ +#ifndef fdt_setprop_inplace_var +#define fdt_setprop_inplace_var(fdt, node_offset, name, var) \ + fdt_setprop_inplace((fdt), (node_offset), (name), &(var), sizeof(var)) +#endif + +#ifndef fdt_setprop_var +#define fdt_setprop_var(fdt, node_offset, name, var) \ + fdt_setprop((fdt), (node_offset), (name), &(var), sizeof(var)) +#endif + +#define get_efi_var(name, vendor, ...) \ + efi_rt_call(get_variable, (efi_char16_t *)(name), \ + (efi_guid_t *)(vendor), __VA_ARGS__) + +#define set_efi_var(name, vendor, ...) \ + efi_rt_call(set_variable, (efi_char16_t *)(name), \ + (efi_guid_t *)(vendor), __VA_ARGS__) + +#define efi_get_handle_at(array, idx) \ + (efi_is_native() ? (array)[idx] \ + : (efi_handle_t)(unsigned long)((u32 *)(array))[idx]) + +#define efi_get_handle_num(size) \ + ((size) / (efi_is_native() ? sizeof(efi_handle_t) : sizeof(u32))) + +#define for_each_efi_handle(handle, array, size, i) \ + for (i = 0; \ + i < efi_get_handle_num(size) && \ + ((handle = efi_get_handle_at((array), i)) || true); \ + i++) + +static inline +void efi_set_u64_split(u64 data, u32 *lo, u32 *hi) +{ + *lo = lower_32_bits(data); + *hi = upper_32_bits(data); +} + +/* + * Allocation types for calls to boottime->allocate_pages. + */ +#define EFI_ALLOCATE_ANY_PAGES 0 +#define EFI_ALLOCATE_MAX_ADDRESS 1 +#define EFI_ALLOCATE_ADDRESS 2 +#define EFI_MAX_ALLOCATE_TYPE 3 + +/* + * The type of search to perform when calling boottime->locate_handle + */ +#define EFI_LOCATE_ALL_HANDLES 0 +#define EFI_LOCATE_BY_REGISTER_NOTIFY 1 +#define EFI_LOCATE_BY_PROTOCOL 2 + +/* + * boottime->stall takes the time period in microseconds + */ +#define EFI_USEC_PER_SEC 1000000 + +/* + * boottime->set_timer takes the time in 100ns units + */ +#define EFI_100NSEC_PER_USEC ((u64)10) + +/* + * An efi_boot_memmap is used by efi_get_memory_map() to return the + * EFI memory map in a dynamically allocated buffer. + * + * The buffer allocated for the EFI memory map includes extra room for + * a minimum of EFI_MMAP_NR_SLACK_SLOTS additional EFI memory descriptors. + * This facilitates the reuse of the EFI memory map buffer when a second + * call to ExitBootServices() is needed because of intervening changes to + * the EFI memory map. Other related structures, e.g. x86 e820ext, need + * to factor in this headroom requirement as well. + */ +#define EFI_MMAP_NR_SLACK_SLOTS 8 + +struct efi_boot_memmap { + efi_memory_desc_t **map; + unsigned long *map_size; + unsigned long *desc_size; + u32 *desc_ver; + unsigned long *key_ptr; + unsigned long *buff_size; +}; + +typedef struct efi_generic_dev_path efi_device_path_protocol_t; + +typedef void *efi_event_t; +/* Note that notifications won't work in mixed mode */ +typedef void (__efiapi *efi_event_notify_t)(efi_event_t, void *); + +#define EFI_EVT_TIMER 0x80000000U +#define EFI_EVT_RUNTIME 0x40000000U +#define EFI_EVT_NOTIFY_WAIT 0x00000100U +#define EFI_EVT_NOTIFY_SIGNAL 0x00000200U + +/** + * efi_set_event_at() - add event to events array + * + * @events: array of UEFI events + * @ids: index where to put the event in the array + * @event: event to add to the aray + * + * boottime->wait_for_event() takes an array of events as input. + * Provide a helper to set it up correctly for mixed mode. + */ +static inline +void efi_set_event_at(efi_event_t *events, size_t idx, efi_event_t event) +{ + if (efi_is_native()) + events[idx] = event; + else + ((u32 *)events)[idx] = (u32)(unsigned long)event; +} + +#define EFI_TPL_APPLICATION 4 +#define EFI_TPL_CALLBACK 8 +#define EFI_TPL_NOTIFY 16 +#define EFI_TPL_HIGH_LEVEL 31 + +typedef enum { + EfiTimerCancel, + EfiTimerPeriodic, + EfiTimerRelative +} EFI_TIMER_DELAY; + +/* + * EFI Boot Services table + */ +union efi_boot_services { + struct { + efi_table_hdr_t hdr; + void *raise_tpl; + void *restore_tpl; + efi_status_t (__efiapi *allocate_pages)(int, int, unsigned long, + efi_physical_addr_t *); + efi_status_t (__efiapi *free_pages)(efi_physical_addr_t, + unsigned long); + efi_status_t (__efiapi *get_memory_map)(unsigned long *, void *, + unsigned long *, + unsigned long *, u32 *); + efi_status_t (__efiapi *allocate_pool)(int, unsigned long, + void **); + efi_status_t (__efiapi *free_pool)(void *); + efi_status_t (__efiapi *create_event)(u32, unsigned long, + efi_event_notify_t, void *, + efi_event_t *); + efi_status_t (__efiapi *set_timer)(efi_event_t, + EFI_TIMER_DELAY, u64); + efi_status_t (__efiapi *wait_for_event)(unsigned long, + efi_event_t *, + unsigned long *); + void *signal_event; + efi_status_t (__efiapi *close_event)(efi_event_t); + void *check_event; + void *install_protocol_interface; + void *reinstall_protocol_interface; + void *uninstall_protocol_interface; + efi_status_t (__efiapi *handle_protocol)(efi_handle_t, + efi_guid_t *, void **); + void *__reserved; + void *register_protocol_notify; + efi_status_t (__efiapi *locate_handle)(int, efi_guid_t *, + void *, unsigned long *, + efi_handle_t *); + efi_status_t (__efiapi *locate_device_path)(efi_guid_t *, + efi_device_path_protocol_t **, + efi_handle_t *); + efi_status_t (__efiapi *install_configuration_table)(efi_guid_t *, + void *); + void *load_image; + void *start_image; + efi_status_t __noreturn (__efiapi *exit)(efi_handle_t, + efi_status_t, + unsigned long, + efi_char16_t *); + void *unload_image; + efi_status_t (__efiapi *exit_boot_services)(efi_handle_t, + unsigned long); + void *get_next_monotonic_count; + efi_status_t (__efiapi *stall)(unsigned long); + void *set_watchdog_timer; + void *connect_controller; + efi_status_t (__efiapi *disconnect_controller)(efi_handle_t, + efi_handle_t, + efi_handle_t); + void *open_protocol; + void *close_protocol; + void *open_protocol_information; + void *protocols_per_handle; + void *locate_handle_buffer; + efi_status_t (__efiapi *locate_protocol)(efi_guid_t *, void *, + void **); + void *install_multiple_protocol_interfaces; + void *uninstall_multiple_protocol_interfaces; + void *calculate_crc32; + void *copy_mem; + void *set_mem; + void *create_event_ex; + }; + struct { + efi_table_hdr_t hdr; + u32 raise_tpl; + u32 restore_tpl; + u32 allocate_pages; + u32 free_pages; + u32 get_memory_map; + u32 allocate_pool; + u32 free_pool; + u32 create_event; + u32 set_timer; + u32 wait_for_event; + u32 signal_event; + u32 close_event; + u32 check_event; + u32 install_protocol_interface; + u32 reinstall_protocol_interface; + u32 uninstall_protocol_interface; + u32 handle_protocol; + u32 __reserved; + u32 register_protocol_notify; + u32 locate_handle; + u32 locate_device_path; + u32 install_configuration_table; + u32 load_image; + u32 start_image; + u32 exit; + u32 unload_image; + u32 exit_boot_services; + u32 get_next_monotonic_count; + u32 stall; + u32 set_watchdog_timer; + u32 connect_controller; + u32 disconnect_controller; + u32 open_protocol; + u32 close_protocol; + u32 open_protocol_information; + u32 protocols_per_handle; + u32 locate_handle_buffer; + u32 locate_protocol; + u32 install_multiple_protocol_interfaces; + u32 uninstall_multiple_protocol_interfaces; + u32 calculate_crc32; + u32 copy_mem; + u32 set_mem; + u32 create_event_ex; + } mixed_mode; +}; + +typedef union efi_uga_draw_protocol efi_uga_draw_protocol_t; + +union efi_uga_draw_protocol { + struct { + efi_status_t (__efiapi *get_mode)(efi_uga_draw_protocol_t *, + u32*, u32*, u32*, u32*); + void *set_mode; + void *blt; + }; + struct { + u32 get_mode; + u32 set_mode; + u32 blt; + } mixed_mode; +}; + +typedef struct { + u16 scan_code; + efi_char16_t unicode_char; +} efi_input_key_t; + +union efi_simple_text_input_protocol { + struct { + void *reset; + efi_status_t (__efiapi *read_keystroke)(efi_simple_text_input_protocol_t *, + efi_input_key_t *); + efi_event_t wait_for_key; + }; + struct { + u32 reset; + u32 read_keystroke; + u32 wait_for_key; + } mixed_mode; +}; + +efi_status_t efi_wait_for_key(unsigned long usec, efi_input_key_t *key); + +union efi_simple_text_output_protocol { + struct { + void *reset; + efi_status_t (__efiapi *output_string)(efi_simple_text_output_protocol_t *, + efi_char16_t *); + void *test_string; + }; + struct { + u32 reset; + u32 output_string; + u32 test_string; + } mixed_mode; +}; + +#define PIXEL_RGB_RESERVED_8BIT_PER_COLOR 0 +#define PIXEL_BGR_RESERVED_8BIT_PER_COLOR 1 +#define PIXEL_BIT_MASK 2 +#define PIXEL_BLT_ONLY 3 +#define PIXEL_FORMAT_MAX 4 + +typedef struct { + u32 red_mask; + u32 green_mask; + u32 blue_mask; + u32 reserved_mask; +} efi_pixel_bitmask_t; + +typedef struct { + u32 version; + u32 horizontal_resolution; + u32 vertical_resolution; + int pixel_format; + efi_pixel_bitmask_t pixel_information; + u32 pixels_per_scan_line; +} efi_graphics_output_mode_info_t; + +typedef union efi_graphics_output_protocol_mode efi_graphics_output_protocol_mode_t; + +union efi_graphics_output_protocol_mode { + struct { + u32 max_mode; + u32 mode; + efi_graphics_output_mode_info_t *info; + unsigned long size_of_info; + efi_physical_addr_t frame_buffer_base; + unsigned long frame_buffer_size; + }; + struct { + u32 max_mode; + u32 mode; + u32 info; + u32 size_of_info; + u64 frame_buffer_base; + u32 frame_buffer_size; + } mixed_mode; +}; + +typedef union efi_graphics_output_protocol efi_graphics_output_protocol_t; + +union efi_graphics_output_protocol { + struct { + efi_status_t (__efiapi *query_mode)(efi_graphics_output_protocol_t *, + u32, unsigned long *, + efi_graphics_output_mode_info_t **); + efi_status_t (__efiapi *set_mode) (efi_graphics_output_protocol_t *, u32); + void *blt; + efi_graphics_output_protocol_mode_t *mode; + }; + struct { + u32 query_mode; + u32 set_mode; + u32 blt; + u32 mode; + } mixed_mode; +}; + +typedef union { + struct { + u32 revision; + efi_handle_t parent_handle; + efi_system_table_t *system_table; + efi_handle_t device_handle; + void *file_path; + void *reserved; + u32 load_options_size; + void *load_options; + void *image_base; + __aligned_u64 image_size; + unsigned int image_code_type; + unsigned int image_data_type; + efi_status_t (__efiapi *unload)(efi_handle_t image_handle); + }; + struct { + u32 revision; + u32 parent_handle; + u32 system_table; + u32 device_handle; + u32 file_path; + u32 reserved; + u32 load_options_size; + u32 load_options; + u32 image_base; + __aligned_u64 image_size; + u32 image_code_type; + u32 image_data_type; + u32 unload; + } mixed_mode; +} efi_loaded_image_t; + +typedef struct { + u64 size; + u64 file_size; + u64 phys_size; + efi_time_t create_time; + efi_time_t last_access_time; + efi_time_t modification_time; + __aligned_u64 attribute; + efi_char16_t filename[]; +} efi_file_info_t; + +typedef struct efi_file_protocol efi_file_protocol_t; + +struct efi_file_protocol { + u64 revision; + efi_status_t (__efiapi *open) (efi_file_protocol_t *, + efi_file_protocol_t **, + efi_char16_t *, u64, u64); + efi_status_t (__efiapi *close) (efi_file_protocol_t *); + efi_status_t (__efiapi *delete) (efi_file_protocol_t *); + efi_status_t (__efiapi *read) (efi_file_protocol_t *, + unsigned long *, void *); + efi_status_t (__efiapi *write) (efi_file_protocol_t *, + unsigned long, void *); + efi_status_t (__efiapi *get_position)(efi_file_protocol_t *, u64 *); + efi_status_t (__efiapi *set_position)(efi_file_protocol_t *, u64); + efi_status_t (__efiapi *get_info) (efi_file_protocol_t *, + efi_guid_t *, unsigned long *, + void *); + efi_status_t (__efiapi *set_info) (efi_file_protocol_t *, + efi_guid_t *, unsigned long, + void *); + efi_status_t (__efiapi *flush) (efi_file_protocol_t *); +}; + +typedef struct efi_simple_file_system_protocol efi_simple_file_system_protocol_t; + +struct efi_simple_file_system_protocol { + u64 revision; + int (__efiapi *open_volume)(efi_simple_file_system_protocol_t *, + efi_file_protocol_t **); +}; + +#define EFI_FILE_MODE_READ 0x0000000000000001 +#define EFI_FILE_MODE_WRITE 0x0000000000000002 +#define EFI_FILE_MODE_CREATE 0x8000000000000000 + +typedef enum { + EfiPciIoWidthUint8, + EfiPciIoWidthUint16, + EfiPciIoWidthUint32, + EfiPciIoWidthUint64, + EfiPciIoWidthFifoUint8, + EfiPciIoWidthFifoUint16, + EfiPciIoWidthFifoUint32, + EfiPciIoWidthFifoUint64, + EfiPciIoWidthFillUint8, + EfiPciIoWidthFillUint16, + EfiPciIoWidthFillUint32, + EfiPciIoWidthFillUint64, + EfiPciIoWidthMaximum +} EFI_PCI_IO_PROTOCOL_WIDTH; + +typedef enum { + EfiPciIoAttributeOperationGet, + EfiPciIoAttributeOperationSet, + EfiPciIoAttributeOperationEnable, + EfiPciIoAttributeOperationDisable, + EfiPciIoAttributeOperationSupported, + EfiPciIoAttributeOperationMaximum +} EFI_PCI_IO_PROTOCOL_ATTRIBUTE_OPERATION; + +typedef struct { + u32 read; + u32 write; +} efi_pci_io_protocol_access_32_t; + +typedef union efi_pci_io_protocol efi_pci_io_protocol_t; + +typedef +efi_status_t (__efiapi *efi_pci_io_protocol_cfg_t)(efi_pci_io_protocol_t *, + EFI_PCI_IO_PROTOCOL_WIDTH, + u32 offset, + unsigned long count, + void *buffer); + +typedef struct { + void *read; + void *write; +} efi_pci_io_protocol_access_t; + +typedef struct { + efi_pci_io_protocol_cfg_t read; + efi_pci_io_protocol_cfg_t write; +} efi_pci_io_protocol_config_access_t; + +union efi_pci_io_protocol { + struct { + void *poll_mem; + void *poll_io; + efi_pci_io_protocol_access_t mem; + efi_pci_io_protocol_access_t io; + efi_pci_io_protocol_config_access_t pci; + void *copy_mem; + void *map; + void *unmap; + void *allocate_buffer; + void *free_buffer; + void *flush; + efi_status_t (__efiapi *get_location)(efi_pci_io_protocol_t *, + unsigned long *segment_nr, + unsigned long *bus_nr, + unsigned long *device_nr, + unsigned long *func_nr); + void *attributes; + void *get_bar_attributes; + void *set_bar_attributes; + uint64_t romsize; + void *romimage; + }; + struct { + u32 poll_mem; + u32 poll_io; + efi_pci_io_protocol_access_32_t mem; + efi_pci_io_protocol_access_32_t io; + efi_pci_io_protocol_access_32_t pci; + u32 copy_mem; + u32 map; + u32 unmap; + u32 allocate_buffer; + u32 free_buffer; + u32 flush; + u32 get_location; + u32 attributes; + u32 get_bar_attributes; + u32 set_bar_attributes; + u64 romsize; + u32 romimage; + } mixed_mode; +}; + +#define EFI_PCI_IO_ATTRIBUTE_ISA_MOTHERBOARD_IO 0x0001 +#define EFI_PCI_IO_ATTRIBUTE_ISA_IO 0x0002 +#define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO 0x0004 +#define EFI_PCI_IO_ATTRIBUTE_VGA_MEMORY 0x0008 +#define EFI_PCI_IO_ATTRIBUTE_VGA_IO 0x0010 +#define EFI_PCI_IO_ATTRIBUTE_IDE_PRIMARY_IO 0x0020 +#define EFI_PCI_IO_ATTRIBUTE_IDE_SECONDARY_IO 0x0040 +#define EFI_PCI_IO_ATTRIBUTE_MEMORY_WRITE_COMBINE 0x0080 +#define EFI_PCI_IO_ATTRIBUTE_IO 0x0100 +#define EFI_PCI_IO_ATTRIBUTE_MEMORY 0x0200 +#define EFI_PCI_IO_ATTRIBUTE_BUS_MASTER 0x0400 +#define EFI_PCI_IO_ATTRIBUTE_MEMORY_CACHED 0x0800 +#define EFI_PCI_IO_ATTRIBUTE_MEMORY_DISABLE 0x1000 +#define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_DEVICE 0x2000 +#define EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM 0x4000 +#define EFI_PCI_IO_ATTRIBUTE_DUAL_ADDRESS_CYCLE 0x8000 +#define EFI_PCI_IO_ATTRIBUTE_ISA_IO_16 0x10000 +#define EFI_PCI_IO_ATTRIBUTE_VGA_PALETTE_IO_16 0x20000 +#define EFI_PCI_IO_ATTRIBUTE_VGA_IO_16 0x40000 + +struct efi_dev_path; + +typedef union apple_properties_protocol apple_properties_protocol_t; + +union apple_properties_protocol { + struct { + unsigned long version; + efi_status_t (__efiapi *get)(apple_properties_protocol_t *, + struct efi_dev_path *, + efi_char16_t *, void *, u32 *); + efi_status_t (__efiapi *set)(apple_properties_protocol_t *, + struct efi_dev_path *, + efi_char16_t *, void *, u32); + efi_status_t (__efiapi *del)(apple_properties_protocol_t *, + struct efi_dev_path *, + efi_char16_t *); + efi_status_t (__efiapi *get_all)(apple_properties_protocol_t *, + void *buffer, u32 *); + }; + struct { + u32 version; + u32 get; + u32 set; + u32 del; + u32 get_all; + } mixed_mode; +}; + +typedef u32 efi_tcg2_event_log_format; + +typedef union efi_tcg2_protocol efi_tcg2_protocol_t; + +union efi_tcg2_protocol { + struct { + void *get_capability; + efi_status_t (__efiapi *get_event_log)(efi_handle_t, + efi_tcg2_event_log_format, + efi_physical_addr_t *, + efi_physical_addr_t *, + efi_bool_t *); + void *hash_log_extend_event; + void *submit_command; + void *get_active_pcr_banks; + void *set_active_pcr_banks; + void *get_result_of_set_active_pcr_banks; + }; + struct { + u32 get_capability; + u32 get_event_log; + u32 hash_log_extend_event; + u32 submit_command; + u32 get_active_pcr_banks; + u32 set_active_pcr_banks; + u32 get_result_of_set_active_pcr_banks; + } mixed_mode; +}; + +typedef union efi_load_file_protocol efi_load_file_protocol_t; +typedef union efi_load_file_protocol efi_load_file2_protocol_t; + +union efi_load_file_protocol { + struct { + efi_status_t (__efiapi *load_file)(efi_load_file_protocol_t *, + efi_device_path_protocol_t *, + bool, unsigned long *, void *); + }; + struct { + u32 load_file; + } mixed_mode; +}; + +typedef struct { + u32 attributes; + u16 file_path_list_length; + u8 variable_data[]; + // efi_char16_t description[]; + // efi_device_path_protocol_t file_path_list[]; + // u8 optional_data[]; +} __packed efi_load_option_t; + +#define EFI_LOAD_OPTION_ACTIVE 0x0001U +#define EFI_LOAD_OPTION_FORCE_RECONNECT 0x0002U +#define EFI_LOAD_OPTION_HIDDEN 0x0008U +#define EFI_LOAD_OPTION_CATEGORY 0x1f00U +#define EFI_LOAD_OPTION_CATEGORY_BOOT 0x0000U +#define EFI_LOAD_OPTION_CATEGORY_APP 0x0100U + +#define EFI_LOAD_OPTION_BOOT_MASK \ + (EFI_LOAD_OPTION_ACTIVE|EFI_LOAD_OPTION_HIDDEN|EFI_LOAD_OPTION_CATEGORY) +#define EFI_LOAD_OPTION_MASK (EFI_LOAD_OPTION_FORCE_RECONNECT|EFI_LOAD_OPTION_BOOT_MASK) + +typedef struct { + u32 attributes; + u16 file_path_list_length; + const efi_char16_t *description; + const efi_device_path_protocol_t *file_path_list; + size_t optional_data_size; + const void *optional_data; +} efi_load_option_unpacked_t; + +void efi_pci_disable_bridge_busmaster(void); + +typedef efi_status_t (*efi_exit_boot_map_processing)( + struct efi_boot_memmap *map, + void *priv); + +efi_status_t efi_exit_boot_services(void *handle, + struct efi_boot_memmap *map, + void *priv, + efi_exit_boot_map_processing priv_func); + +efi_status_t allocate_new_fdt_and_exit_boot(void *handle, + unsigned long *new_fdt_addr, + unsigned long max_addr, + u64 initrd_addr, u64 initrd_size, + char *cmdline_ptr, + unsigned long fdt_addr, + unsigned long fdt_size); + +void *get_fdt(unsigned long *fdt_size); + +void efi_get_virtmap(efi_memory_desc_t *memory_map, unsigned long map_size, + unsigned long desc_size, efi_memory_desc_t *runtime_map, + int *count); + +efi_status_t efi_get_random_bytes(unsigned long size, u8 *out); + +efi_status_t efi_random_alloc(unsigned long size, unsigned long align, + unsigned long *addr, unsigned long random_seed); + +efi_status_t efi_random_get_seed(void); + +efi_status_t check_platform_features(void); + +void *get_efi_config_table(efi_guid_t guid); + +/* NOTE: These functions do not print a trailing newline after the string */ +void efi_char16_puts(efi_char16_t *); +void efi_puts(const char *str); + +__printf(1, 2) int efi_printk(char const *fmt, ...); + +void efi_free(unsigned long size, unsigned long addr); + +void efi_apply_loadoptions_quirk(const void **load_options, int *load_options_size); + +char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len); + +efi_status_t efi_get_memory_map(struct efi_boot_memmap *map); + +efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr, + unsigned long max); + +efi_status_t efi_allocate_pages_aligned(unsigned long size, unsigned long *addr, + unsigned long max, unsigned long align); + +efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align, + unsigned long *addr, unsigned long min); + +efi_status_t efi_relocate_kernel(unsigned long *image_addr, + unsigned long image_size, + unsigned long alloc_size, + unsigned long preferred_addr, + unsigned long alignment, + unsigned long min_addr); + +efi_status_t efi_parse_options(char const *cmdline); + +void efi_parse_option_graphics(char *option); + +efi_status_t efi_setup_gop(struct screen_info *si, efi_guid_t *proto, + unsigned long size); + +efi_status_t handle_cmdline_files(efi_loaded_image_t *image, + const efi_char16_t *optstr, + int optstr_size, + unsigned long soft_limit, + unsigned long hard_limit, + unsigned long *load_addr, + unsigned long *load_size); + + +static inline efi_status_t efi_load_dtb(efi_loaded_image_t *image, + unsigned long *load_addr, + unsigned long *load_size) +{ + return handle_cmdline_files(image, L"dtb=", sizeof(L"dtb=") - 2, + ULONG_MAX, ULONG_MAX, load_addr, load_size); +} + +efi_status_t efi_load_initrd(efi_loaded_image_t *image, + unsigned long *load_addr, + unsigned long *load_size, + unsigned long soft_limit, + unsigned long hard_limit); +/* + * This function handles the architcture specific differences between arm and + * arm64 regarding where the kernel image must be loaded and any memory that + * must be reserved. On failure it is required to free all + * all allocations it has made. + */ +efi_status_t handle_kernel_image(unsigned long *image_addr, + unsigned long *image_size, + unsigned long *reserve_addr, + unsigned long *reserve_size, + efi_loaded_image_t *image); + +asmlinkage void __noreturn efi_enter_kernel(unsigned long entrypoint, + unsigned long fdt_addr, + unsigned long fdt_size); + +void efi_handle_post_ebs_state(void); + +#endif diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c new file mode 100644 index 000000000..d48b0de05 --- /dev/null +++ b/drivers/firmware/efi/libstub/fdt.c @@ -0,0 +1,361 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * FDT related Helper functions used by the EFI stub on multiple + * architectures. This should be #included by the EFI stub + * implementation files. + * + * Copyright 2013 Linaro Limited; author Roy Franz + */ + +#include <linux/efi.h> +#include <linux/libfdt.h> +#include <asm/efi.h> + +#include "efistub.h" + +#define EFI_DT_ADDR_CELLS_DEFAULT 2 +#define EFI_DT_SIZE_CELLS_DEFAULT 2 + +static void fdt_update_cell_size(void *fdt) +{ + int offset; + + offset = fdt_path_offset(fdt, "/"); + /* Set the #address-cells and #size-cells values for an empty tree */ + + fdt_setprop_u32(fdt, offset, "#address-cells", EFI_DT_ADDR_CELLS_DEFAULT); + fdt_setprop_u32(fdt, offset, "#size-cells", EFI_DT_SIZE_CELLS_DEFAULT); +} + +static efi_status_t update_fdt(void *orig_fdt, unsigned long orig_fdt_size, + void *fdt, int new_fdt_size, char *cmdline_ptr, + u64 initrd_addr, u64 initrd_size) +{ + int node, num_rsv; + int status; + u32 fdt_val32; + u64 fdt_val64; + + /* Do some checks on provided FDT, if it exists: */ + if (orig_fdt) { + if (fdt_check_header(orig_fdt)) { + efi_err("Device Tree header not valid!\n"); + return EFI_LOAD_ERROR; + } + /* + * We don't get the size of the FDT if we get if from a + * configuration table: + */ + if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) { + efi_err("Truncated device tree! foo!\n"); + return EFI_LOAD_ERROR; + } + } + + if (orig_fdt) { + status = fdt_open_into(orig_fdt, fdt, new_fdt_size); + } else { + status = fdt_create_empty_tree(fdt, new_fdt_size); + if (status == 0) { + /* + * Any failure from the following function is + * non-critical: + */ + fdt_update_cell_size(fdt); + } + } + + if (status != 0) + goto fdt_set_fail; + + /* + * Delete all memory reserve map entries. When booting via UEFI, + * kernel will use the UEFI memory map to find reserved regions. + */ + num_rsv = fdt_num_mem_rsv(fdt); + while (num_rsv-- > 0) + fdt_del_mem_rsv(fdt, num_rsv); + + node = fdt_subnode_offset(fdt, 0, "chosen"); + if (node < 0) { + node = fdt_add_subnode(fdt, 0, "chosen"); + if (node < 0) { + /* 'node' is an error code when negative: */ + status = node; + goto fdt_set_fail; + } + } + + if (cmdline_ptr != NULL && strlen(cmdline_ptr) > 0) { + status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr, + strlen(cmdline_ptr) + 1); + if (status) + goto fdt_set_fail; + } + + /* Set initrd address/end in device tree, if present */ + if (initrd_size != 0) { + u64 initrd_image_end; + u64 initrd_image_start = cpu_to_fdt64(initrd_addr); + + status = fdt_setprop_var(fdt, node, "linux,initrd-start", initrd_image_start); + if (status) + goto fdt_set_fail; + + initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size); + status = fdt_setprop_var(fdt, node, "linux,initrd-end", initrd_image_end); + if (status) + goto fdt_set_fail; + } + + /* Add FDT entries for EFI runtime services in chosen node. */ + node = fdt_subnode_offset(fdt, 0, "chosen"); + fdt_val64 = cpu_to_fdt64((u64)(unsigned long)efi_system_table); + + status = fdt_setprop_var(fdt, node, "linux,uefi-system-table", fdt_val64); + if (status) + goto fdt_set_fail; + + fdt_val64 = U64_MAX; /* placeholder */ + + status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-start", fdt_val64); + if (status) + goto fdt_set_fail; + + fdt_val32 = U32_MAX; /* placeholder */ + + status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-size", fdt_val32); + if (status) + goto fdt_set_fail; + + status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-desc-size", fdt_val32); + if (status) + goto fdt_set_fail; + + status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-desc-ver", fdt_val32); + if (status) + goto fdt_set_fail; + + if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) { + efi_status_t efi_status; + + efi_status = efi_get_random_bytes(sizeof(fdt_val64), + (u8 *)&fdt_val64); + if (efi_status == EFI_SUCCESS) { + status = fdt_setprop_var(fdt, node, "kaslr-seed", fdt_val64); + if (status) + goto fdt_set_fail; + } + } + + /* Shrink the FDT back to its minimum size: */ + fdt_pack(fdt); + + return EFI_SUCCESS; + +fdt_set_fail: + if (status == -FDT_ERR_NOSPACE) + return EFI_BUFFER_TOO_SMALL; + + return EFI_LOAD_ERROR; +} + +static efi_status_t update_fdt_memmap(void *fdt, struct efi_boot_memmap *map) +{ + int node = fdt_path_offset(fdt, "/chosen"); + u64 fdt_val64; + u32 fdt_val32; + int err; + + if (node < 0) + return EFI_LOAD_ERROR; + + fdt_val64 = cpu_to_fdt64((unsigned long)*map->map); + + err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-start", fdt_val64); + if (err) + return EFI_LOAD_ERROR; + + fdt_val32 = cpu_to_fdt32(*map->map_size); + + err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-size", fdt_val32); + if (err) + return EFI_LOAD_ERROR; + + fdt_val32 = cpu_to_fdt32(*map->desc_size); + + err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-desc-size", fdt_val32); + if (err) + return EFI_LOAD_ERROR; + + fdt_val32 = cpu_to_fdt32(*map->desc_ver); + + err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-desc-ver", fdt_val32); + if (err) + return EFI_LOAD_ERROR; + + return EFI_SUCCESS; +} + +struct exit_boot_struct { + efi_memory_desc_t *runtime_map; + int *runtime_entry_count; + void *new_fdt_addr; +}; + +static efi_status_t exit_boot_func(struct efi_boot_memmap *map, + void *priv) +{ + struct exit_boot_struct *p = priv; + /* + * Update the memory map with virtual addresses. The function will also + * populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME + * entries so that we can pass it straight to SetVirtualAddressMap() + */ + efi_get_virtmap(*map->map, *map->map_size, *map->desc_size, + p->runtime_map, p->runtime_entry_count); + + return update_fdt_memmap(p->new_fdt_addr, map); +} + +#ifndef MAX_FDT_SIZE +# define MAX_FDT_SIZE SZ_2M +#endif + +/* + * Allocate memory for a new FDT, then add EFI, commandline, and + * initrd related fields to the FDT. This routine increases the + * FDT allocation size until the allocated memory is large + * enough. EFI allocations are in EFI_PAGE_SIZE granules, + * which are fixed at 4K bytes, so in most cases the first + * allocation should succeed. + * EFI boot services are exited at the end of this function. + * There must be no allocations between the get_memory_map() + * call and the exit_boot_services() call, so the exiting of + * boot services is very tightly tied to the creation of the FDT + * with the final memory map in it. + */ + +efi_status_t allocate_new_fdt_and_exit_boot(void *handle, + unsigned long *new_fdt_addr, + unsigned long max_addr, + u64 initrd_addr, u64 initrd_size, + char *cmdline_ptr, + unsigned long fdt_addr, + unsigned long fdt_size) +{ + unsigned long map_size, desc_size, buff_size; + u32 desc_ver; + unsigned long mmap_key; + efi_memory_desc_t *memory_map, *runtime_map; + efi_status_t status; + int runtime_entry_count; + struct efi_boot_memmap map; + struct exit_boot_struct priv; + + map.map = &runtime_map; + map.map_size = &map_size; + map.desc_size = &desc_size; + map.desc_ver = &desc_ver; + map.key_ptr = &mmap_key; + map.buff_size = &buff_size; + + /* + * Get a copy of the current memory map that we will use to prepare + * the input for SetVirtualAddressMap(). We don't have to worry about + * subsequent allocations adding entries, since they could not affect + * the number of EFI_MEMORY_RUNTIME regions. + */ + status = efi_get_memory_map(&map); + if (status != EFI_SUCCESS) { + efi_err("Unable to retrieve UEFI memory map.\n"); + return status; + } + + efi_info("Exiting boot services and installing virtual address map...\n"); + + map.map = &memory_map; + status = efi_allocate_pages(MAX_FDT_SIZE, new_fdt_addr, max_addr); + if (status != EFI_SUCCESS) { + efi_err("Unable to allocate memory for new device tree.\n"); + goto fail; + } + + status = update_fdt((void *)fdt_addr, fdt_size, + (void *)*new_fdt_addr, MAX_FDT_SIZE, cmdline_ptr, + initrd_addr, initrd_size); + + if (status != EFI_SUCCESS) { + efi_err("Unable to construct new device tree.\n"); + goto fail_free_new_fdt; + } + + runtime_entry_count = 0; + priv.runtime_map = runtime_map; + priv.runtime_entry_count = &runtime_entry_count; + priv.new_fdt_addr = (void *)*new_fdt_addr; + + status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func); + + if (status == EFI_SUCCESS) { + efi_set_virtual_address_map_t *svam; + + if (efi_novamap) + return EFI_SUCCESS; + + /* Install the new virtual address map */ + svam = efi_system_table->runtime->set_virtual_address_map; + status = svam(runtime_entry_count * desc_size, desc_size, + desc_ver, runtime_map); + + /* + * We are beyond the point of no return here, so if the call to + * SetVirtualAddressMap() failed, we need to signal that to the + * incoming kernel but proceed normally otherwise. + */ + if (status != EFI_SUCCESS) { + int l; + + /* + * Set the virtual address field of all + * EFI_MEMORY_RUNTIME entries to 0. This will signal + * the incoming kernel that no virtual translation has + * been installed. + */ + for (l = 0; l < map_size; l += desc_size) { + efi_memory_desc_t *p = (void *)memory_map + l; + + if (p->attribute & EFI_MEMORY_RUNTIME) + p->virt_addr = 0; + } + } + return EFI_SUCCESS; + } + + efi_err("Exit boot services failed.\n"); + +fail_free_new_fdt: + efi_free(MAX_FDT_SIZE, *new_fdt_addr); + +fail: + efi_system_table->boottime->free_pool(runtime_map); + + return EFI_LOAD_ERROR; +} + +void *get_fdt(unsigned long *fdt_size) +{ + void *fdt; + + fdt = get_efi_config_table(DEVICE_TREE_GUID); + + if (!fdt) + return NULL; + + if (fdt_check_header(fdt) != 0) { + efi_err("Invalid header detected on UEFI supplied FDT, ignoring ...\n"); + return NULL; + } + *fdt_size = fdt_totalsize(fdt); + return fdt; +} diff --git a/drivers/firmware/efi/libstub/file.c b/drivers/firmware/efi/libstub/file.c new file mode 100644 index 000000000..dd95f330f --- /dev/null +++ b/drivers/firmware/efi/libstub/file.c @@ -0,0 +1,250 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Helper functions used by the EFI stub on multiple + * architectures. This should be #included by the EFI stub + * implementation files. + * + * Copyright 2011 Intel Corporation; author Matt Fleming + */ + +#include <linux/efi.h> +#include <asm/efi.h> + +#include "efistub.h" + +#define MAX_FILENAME_SIZE 256 + +/* + * Some firmware implementations have problems reading files in one go. + * A read chunk size of 1MB seems to work for most platforms. + * + * Unfortunately, reading files in chunks triggers *other* bugs on some + * platforms, so we provide a way to disable this workaround, which can + * be done by passing "efi=nochunk" on the EFI boot stub command line. + * + * If you experience issues with initrd images being corrupt it's worth + * trying efi=nochunk, but chunking is enabled by default on x86 because + * there are far more machines that require the workaround than those that + * break with it enabled. + */ +#define EFI_READ_CHUNK_SIZE SZ_1M + +struct finfo { + efi_file_info_t info; + efi_char16_t filename[MAX_FILENAME_SIZE]; +}; + +static efi_status_t efi_open_file(efi_file_protocol_t *volume, + struct finfo *fi, + efi_file_protocol_t **handle, + unsigned long *file_size) +{ + efi_guid_t info_guid = EFI_FILE_INFO_ID; + efi_file_protocol_t *fh; + unsigned long info_sz; + efi_status_t status; + + status = volume->open(volume, &fh, fi->filename, EFI_FILE_MODE_READ, 0); + if (status != EFI_SUCCESS) { + efi_err("Failed to open file: %ls\n", fi->filename); + return status; + } + + info_sz = sizeof(struct finfo); + status = fh->get_info(fh, &info_guid, &info_sz, fi); + if (status != EFI_SUCCESS) { + efi_err("Failed to get file info\n"); + fh->close(fh); + return status; + } + + *handle = fh; + *file_size = fi->info.file_size; + return EFI_SUCCESS; +} + +static efi_status_t efi_open_volume(efi_loaded_image_t *image, + efi_file_protocol_t **fh) +{ + efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID; + efi_simple_file_system_protocol_t *io; + efi_status_t status; + + status = efi_bs_call(handle_protocol, image->device_handle, &fs_proto, + (void **)&io); + if (status != EFI_SUCCESS) { + efi_err("Failed to handle fs_proto\n"); + return status; + } + + status = io->open_volume(io, fh); + if (status != EFI_SUCCESS) + efi_err("Failed to open volume\n"); + + return status; +} + +static int find_file_option(const efi_char16_t *cmdline, int cmdline_len, + const efi_char16_t *prefix, int prefix_size, + efi_char16_t *result, int result_len) +{ + int prefix_len = prefix_size / 2; + bool found = false; + int i; + + for (i = prefix_len; i < cmdline_len; i++) { + if (!memcmp(&cmdline[i - prefix_len], prefix, prefix_size)) { + found = true; + break; + } + } + + if (!found) + return 0; + + /* Skip any leading slashes */ + while (i < cmdline_len && (cmdline[i] == L'/' || cmdline[i] == L'\\')) + i++; + + while (--result_len > 0 && i < cmdline_len) { + efi_char16_t c = cmdline[i++]; + + if (c == L'\0' || c == L'\n' || c == L' ') + break; + else if (c == L'/') + /* Replace UNIX dir separators with EFI standard ones */ + *result++ = L'\\'; + else + *result++ = c; + } + *result = L'\0'; + return i; +} + +/* + * Check the cmdline for a LILO-style file= arguments. + * + * We only support loading a file from the same filesystem as + * the kernel image. + */ +efi_status_t handle_cmdline_files(efi_loaded_image_t *image, + const efi_char16_t *optstr, + int optstr_size, + unsigned long soft_limit, + unsigned long hard_limit, + unsigned long *load_addr, + unsigned long *load_size) +{ + const efi_char16_t *cmdline = image->load_options; + int cmdline_len = image->load_options_size; + unsigned long efi_chunk_size = ULONG_MAX; + efi_file_protocol_t *volume = NULL; + efi_file_protocol_t *file; + unsigned long alloc_addr; + unsigned long alloc_size; + efi_status_t status; + int offset; + + if (!load_addr || !load_size) + return EFI_INVALID_PARAMETER; + + efi_apply_loadoptions_quirk((const void **)&cmdline, &cmdline_len); + cmdline_len /= sizeof(*cmdline); + + if (IS_ENABLED(CONFIG_X86) && !efi_nochunk) + efi_chunk_size = EFI_READ_CHUNK_SIZE; + + alloc_addr = alloc_size = 0; + do { + struct finfo fi; + unsigned long size; + void *addr; + + offset = find_file_option(cmdline, cmdline_len, + optstr, optstr_size, + fi.filename, ARRAY_SIZE(fi.filename)); + + if (!offset) + break; + + cmdline += offset; + cmdline_len -= offset; + + if (!volume) { + status = efi_open_volume(image, &volume); + if (status != EFI_SUCCESS) + return status; + } + + status = efi_open_file(volume, &fi, &file, &size); + if (status != EFI_SUCCESS) + goto err_close_volume; + + /* + * Check whether the existing allocation can contain the next + * file. This condition will also trigger naturally during the + * first (and typically only) iteration of the loop, given that + * alloc_size == 0 in that case. + */ + if (round_up(alloc_size + size, EFI_ALLOC_ALIGN) > + round_up(alloc_size, EFI_ALLOC_ALIGN)) { + unsigned long old_addr = alloc_addr; + + status = EFI_OUT_OF_RESOURCES; + if (soft_limit < hard_limit) + status = efi_allocate_pages(alloc_size + size, + &alloc_addr, + soft_limit); + if (status == EFI_OUT_OF_RESOURCES) + status = efi_allocate_pages(alloc_size + size, + &alloc_addr, + hard_limit); + if (status != EFI_SUCCESS) { + efi_err("Failed to allocate memory for files\n"); + goto err_close_file; + } + + if (old_addr != 0) { + /* + * This is not the first time we've gone + * around this loop, and so we are loading + * multiple files that need to be concatenated + * and returned in a single buffer. + */ + memcpy((void *)alloc_addr, (void *)old_addr, alloc_size); + efi_free(alloc_size, old_addr); + } + } + + addr = (void *)alloc_addr + alloc_size; + alloc_size += size; + + while (size) { + unsigned long chunksize = min(size, efi_chunk_size); + + status = file->read(file, &chunksize, addr); + if (status != EFI_SUCCESS) { + efi_err("Failed to read file\n"); + goto err_close_file; + } + addr += chunksize; + size -= chunksize; + } + file->close(file); + } while (offset > 0); + + *load_addr = alloc_addr; + *load_size = alloc_size; + + if (volume) + volume->close(volume); + return EFI_SUCCESS; + +err_close_file: + file->close(file); + +err_close_volume: + volume->close(volume); + efi_free(alloc_size, alloc_addr); + return status; +} diff --git a/drivers/firmware/efi/libstub/gop.c b/drivers/firmware/efi/libstub/gop.c new file mode 100644 index 000000000..ea5da307d --- /dev/null +++ b/drivers/firmware/efi/libstub/gop.c @@ -0,0 +1,580 @@ +// SPDX-License-Identifier: GPL-2.0 +/* ----------------------------------------------------------------------- + * + * Copyright 2011 Intel Corporation; author Matt Fleming + * + * ----------------------------------------------------------------------- */ + +#include <linux/bitops.h> +#include <linux/ctype.h> +#include <linux/efi.h> +#include <linux/screen_info.h> +#include <linux/string.h> +#include <asm/efi.h> +#include <asm/setup.h> + +#include "efistub.h" + +enum efi_cmdline_option { + EFI_CMDLINE_NONE, + EFI_CMDLINE_MODE_NUM, + EFI_CMDLINE_RES, + EFI_CMDLINE_AUTO, + EFI_CMDLINE_LIST +}; + +static struct { + enum efi_cmdline_option option; + union { + u32 mode; + struct { + u32 width, height; + int format; + u8 depth; + } res; + }; +} cmdline = { .option = EFI_CMDLINE_NONE }; + +static bool parse_modenum(char *option, char **next) +{ + u32 m; + + if (!strstarts(option, "mode=")) + return false; + option += strlen("mode="); + m = simple_strtoull(option, &option, 0); + if (*option && *option++ != ',') + return false; + cmdline.option = EFI_CMDLINE_MODE_NUM; + cmdline.mode = m; + + *next = option; + return true; +} + +static bool parse_res(char *option, char **next) +{ + u32 w, h, d = 0; + int pf = -1; + + if (!isdigit(*option)) + return false; + w = simple_strtoull(option, &option, 10); + if (*option++ != 'x' || !isdigit(*option)) + return false; + h = simple_strtoull(option, &option, 10); + if (*option == '-') { + option++; + if (strstarts(option, "rgb")) { + option += strlen("rgb"); + pf = PIXEL_RGB_RESERVED_8BIT_PER_COLOR; + } else if (strstarts(option, "bgr")) { + option += strlen("bgr"); + pf = PIXEL_BGR_RESERVED_8BIT_PER_COLOR; + } else if (isdigit(*option)) + d = simple_strtoull(option, &option, 10); + else + return false; + } + if (*option && *option++ != ',') + return false; + cmdline.option = EFI_CMDLINE_RES; + cmdline.res.width = w; + cmdline.res.height = h; + cmdline.res.format = pf; + cmdline.res.depth = d; + + *next = option; + return true; +} + +static bool parse_auto(char *option, char **next) +{ + if (!strstarts(option, "auto")) + return false; + option += strlen("auto"); + if (*option && *option++ != ',') + return false; + cmdline.option = EFI_CMDLINE_AUTO; + + *next = option; + return true; +} + +static bool parse_list(char *option, char **next) +{ + if (!strstarts(option, "list")) + return false; + option += strlen("list"); + if (*option && *option++ != ',') + return false; + cmdline.option = EFI_CMDLINE_LIST; + + *next = option; + return true; +} + +void efi_parse_option_graphics(char *option) +{ + while (*option) { + if (parse_modenum(option, &option)) + continue; + if (parse_res(option, &option)) + continue; + if (parse_auto(option, &option)) + continue; + if (parse_list(option, &option)) + continue; + + while (*option && *option++ != ',') + ; + } +} + +static u32 choose_mode_modenum(efi_graphics_output_protocol_t *gop) +{ + efi_status_t status; + + efi_graphics_output_protocol_mode_t *mode; + efi_graphics_output_mode_info_t *info; + unsigned long info_size; + + u32 max_mode, cur_mode; + int pf; + + mode = efi_table_attr(gop, mode); + + cur_mode = efi_table_attr(mode, mode); + if (cmdline.mode == cur_mode) + return cur_mode; + + max_mode = efi_table_attr(mode, max_mode); + if (cmdline.mode >= max_mode) { + efi_err("Requested mode is invalid\n"); + return cur_mode; + } + + status = efi_call_proto(gop, query_mode, cmdline.mode, + &info_size, &info); + if (status != EFI_SUCCESS) { + efi_err("Couldn't get mode information\n"); + return cur_mode; + } + + pf = info->pixel_format; + + efi_bs_call(free_pool, info); + + if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX) { + efi_err("Invalid PixelFormat\n"); + return cur_mode; + } + + return cmdline.mode; +} + +static u8 pixel_bpp(int pixel_format, efi_pixel_bitmask_t pixel_info) +{ + if (pixel_format == PIXEL_BIT_MASK) { + u32 mask = pixel_info.red_mask | pixel_info.green_mask | + pixel_info.blue_mask | pixel_info.reserved_mask; + if (!mask) + return 0; + return __fls(mask) - __ffs(mask) + 1; + } else + return 32; +} + +static u32 choose_mode_res(efi_graphics_output_protocol_t *gop) +{ + efi_status_t status; + + efi_graphics_output_protocol_mode_t *mode; + efi_graphics_output_mode_info_t *info; + unsigned long info_size; + + u32 max_mode, cur_mode; + int pf; + efi_pixel_bitmask_t pi; + u32 m, w, h; + + mode = efi_table_attr(gop, mode); + + cur_mode = efi_table_attr(mode, mode); + info = efi_table_attr(mode, info); + pf = info->pixel_format; + pi = info->pixel_information; + w = info->horizontal_resolution; + h = info->vertical_resolution; + + if (w == cmdline.res.width && h == cmdline.res.height && + (cmdline.res.format < 0 || cmdline.res.format == pf) && + (!cmdline.res.depth || cmdline.res.depth == pixel_bpp(pf, pi))) + return cur_mode; + + max_mode = efi_table_attr(mode, max_mode); + + for (m = 0; m < max_mode; m++) { + if (m == cur_mode) + continue; + + status = efi_call_proto(gop, query_mode, m, + &info_size, &info); + if (status != EFI_SUCCESS) + continue; + + pf = info->pixel_format; + pi = info->pixel_information; + w = info->horizontal_resolution; + h = info->vertical_resolution; + + efi_bs_call(free_pool, info); + + if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX) + continue; + if (w == cmdline.res.width && h == cmdline.res.height && + (cmdline.res.format < 0 || cmdline.res.format == pf) && + (!cmdline.res.depth || cmdline.res.depth == pixel_bpp(pf, pi))) + return m; + } + + efi_err("Couldn't find requested mode\n"); + + return cur_mode; +} + +static u32 choose_mode_auto(efi_graphics_output_protocol_t *gop) +{ + efi_status_t status; + + efi_graphics_output_protocol_mode_t *mode; + efi_graphics_output_mode_info_t *info; + unsigned long info_size; + + u32 max_mode, cur_mode, best_mode, area; + u8 depth; + int pf; + efi_pixel_bitmask_t pi; + u32 m, w, h, a; + u8 d; + + mode = efi_table_attr(gop, mode); + + cur_mode = efi_table_attr(mode, mode); + max_mode = efi_table_attr(mode, max_mode); + + info = efi_table_attr(mode, info); + + pf = info->pixel_format; + pi = info->pixel_information; + w = info->horizontal_resolution; + h = info->vertical_resolution; + + best_mode = cur_mode; + area = w * h; + depth = pixel_bpp(pf, pi); + + for (m = 0; m < max_mode; m++) { + if (m == cur_mode) + continue; + + status = efi_call_proto(gop, query_mode, m, + &info_size, &info); + if (status != EFI_SUCCESS) + continue; + + pf = info->pixel_format; + pi = info->pixel_information; + w = info->horizontal_resolution; + h = info->vertical_resolution; + + efi_bs_call(free_pool, info); + + if (pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX) + continue; + a = w * h; + if (a < area) + continue; + d = pixel_bpp(pf, pi); + if (a > area || d > depth) { + best_mode = m; + area = a; + depth = d; + } + } + + return best_mode; +} + +static u32 choose_mode_list(efi_graphics_output_protocol_t *gop) +{ + efi_status_t status; + + efi_graphics_output_protocol_mode_t *mode; + efi_graphics_output_mode_info_t *info; + unsigned long info_size; + + u32 max_mode, cur_mode; + int pf; + efi_pixel_bitmask_t pi; + u32 m, w, h; + u8 d; + const char *dstr; + bool valid; + efi_input_key_t key; + + mode = efi_table_attr(gop, mode); + + cur_mode = efi_table_attr(mode, mode); + max_mode = efi_table_attr(mode, max_mode); + + efi_printk("Available graphics modes are 0-%u\n", max_mode-1); + efi_puts(" * = current mode\n" + " - = unusable mode\n"); + for (m = 0; m < max_mode; m++) { + status = efi_call_proto(gop, query_mode, m, + &info_size, &info); + if (status != EFI_SUCCESS) + continue; + + pf = info->pixel_format; + pi = info->pixel_information; + w = info->horizontal_resolution; + h = info->vertical_resolution; + + efi_bs_call(free_pool, info); + + valid = !(pf == PIXEL_BLT_ONLY || pf >= PIXEL_FORMAT_MAX); + d = 0; + switch (pf) { + case PIXEL_RGB_RESERVED_8BIT_PER_COLOR: + dstr = "rgb"; + break; + case PIXEL_BGR_RESERVED_8BIT_PER_COLOR: + dstr = "bgr"; + break; + case PIXEL_BIT_MASK: + dstr = ""; + d = pixel_bpp(pf, pi); + break; + case PIXEL_BLT_ONLY: + dstr = "blt"; + break; + default: + dstr = "xxx"; + break; + } + + efi_printk("Mode %3u %c%c: Resolution %ux%u-%s%.0hhu\n", + m, + m == cur_mode ? '*' : ' ', + !valid ? '-' : ' ', + w, h, dstr, d); + } + + efi_puts("\nPress any key to continue (or wait 10 seconds)\n"); + status = efi_wait_for_key(10 * EFI_USEC_PER_SEC, &key); + if (status != EFI_SUCCESS && status != EFI_TIMEOUT) { + efi_err("Unable to read key, continuing in 10 seconds\n"); + efi_bs_call(stall, 10 * EFI_USEC_PER_SEC); + } + + return cur_mode; +} + +static void set_mode(efi_graphics_output_protocol_t *gop) +{ + efi_graphics_output_protocol_mode_t *mode; + u32 cur_mode, new_mode; + + switch (cmdline.option) { + case EFI_CMDLINE_MODE_NUM: + new_mode = choose_mode_modenum(gop); + break; + case EFI_CMDLINE_RES: + new_mode = choose_mode_res(gop); + break; + case EFI_CMDLINE_AUTO: + new_mode = choose_mode_auto(gop); + break; + case EFI_CMDLINE_LIST: + new_mode = choose_mode_list(gop); + break; + default: + return; + } + + mode = efi_table_attr(gop, mode); + cur_mode = efi_table_attr(mode, mode); + + if (new_mode == cur_mode) + return; + + if (efi_call_proto(gop, set_mode, new_mode) != EFI_SUCCESS) + efi_err("Failed to set requested mode\n"); +} + +static void find_bits(u32 mask, u8 *pos, u8 *size) +{ + if (!mask) { + *pos = *size = 0; + return; + } + + /* UEFI spec guarantees that the set bits are contiguous */ + *pos = __ffs(mask); + *size = __fls(mask) - *pos + 1; +} + +static void +setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line, + efi_pixel_bitmask_t pixel_info, int pixel_format) +{ + if (pixel_format == PIXEL_BIT_MASK) { + find_bits(pixel_info.red_mask, + &si->red_pos, &si->red_size); + find_bits(pixel_info.green_mask, + &si->green_pos, &si->green_size); + find_bits(pixel_info.blue_mask, + &si->blue_pos, &si->blue_size); + find_bits(pixel_info.reserved_mask, + &si->rsvd_pos, &si->rsvd_size); + si->lfb_depth = si->red_size + si->green_size + + si->blue_size + si->rsvd_size; + si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8; + } else { + if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) { + si->red_pos = 0; + si->blue_pos = 16; + } else /* PIXEL_BGR_RESERVED_8BIT_PER_COLOR */ { + si->blue_pos = 0; + si->red_pos = 16; + } + + si->green_pos = 8; + si->rsvd_pos = 24; + si->red_size = si->green_size = + si->blue_size = si->rsvd_size = 8; + + si->lfb_depth = 32; + si->lfb_linelength = pixels_per_scan_line * 4; + } +} + +static efi_graphics_output_protocol_t * +find_gop(efi_guid_t *proto, unsigned long size, void **handles) +{ + efi_graphics_output_protocol_t *first_gop; + efi_handle_t h; + int i; + + first_gop = NULL; + + for_each_efi_handle(h, handles, size, i) { + efi_status_t status; + + efi_graphics_output_protocol_t *gop; + efi_graphics_output_protocol_mode_t *mode; + efi_graphics_output_mode_info_t *info; + + efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID; + void *dummy = NULL; + + status = efi_bs_call(handle_protocol, h, proto, (void **)&gop); + if (status != EFI_SUCCESS) + continue; + + mode = efi_table_attr(gop, mode); + info = efi_table_attr(mode, info); + if (info->pixel_format == PIXEL_BLT_ONLY || + info->pixel_format >= PIXEL_FORMAT_MAX) + continue; + + /* + * Systems that use the UEFI Console Splitter may + * provide multiple GOP devices, not all of which are + * backed by real hardware. The workaround is to search + * for a GOP implementing the ConOut protocol, and if + * one isn't found, to just fall back to the first GOP. + * + * Once we've found a GOP supporting ConOut, + * don't bother looking any further. + */ + status = efi_bs_call(handle_protocol, h, &conout_proto, &dummy); + if (status == EFI_SUCCESS) + return gop; + + if (!first_gop) + first_gop = gop; + } + + return first_gop; +} + +static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto, + unsigned long size, void **handles) +{ + efi_graphics_output_protocol_t *gop; + efi_graphics_output_protocol_mode_t *mode; + efi_graphics_output_mode_info_t *info; + + gop = find_gop(proto, size, handles); + + /* Did we find any GOPs? */ + if (!gop) + return EFI_NOT_FOUND; + + /* Change mode if requested */ + set_mode(gop); + + /* EFI framebuffer */ + mode = efi_table_attr(gop, mode); + info = efi_table_attr(mode, info); + + si->orig_video_isVGA = VIDEO_TYPE_EFI; + + si->lfb_width = info->horizontal_resolution; + si->lfb_height = info->vertical_resolution; + + efi_set_u64_split(efi_table_attr(mode, frame_buffer_base), + &si->lfb_base, &si->ext_lfb_base); + if (si->ext_lfb_base) + si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE; + + si->pages = 1; + + setup_pixel_info(si, info->pixels_per_scan_line, + info->pixel_information, info->pixel_format); + + si->lfb_size = si->lfb_linelength * si->lfb_height; + + si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS; + + return EFI_SUCCESS; +} + +/* + * See if we have Graphics Output Protocol + */ +efi_status_t efi_setup_gop(struct screen_info *si, efi_guid_t *proto, + unsigned long size) +{ + efi_status_t status; + void **gop_handle = NULL; + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, + (void **)&gop_handle); + if (status != EFI_SUCCESS) + return status; + + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, proto, NULL, + &size, gop_handle); + if (status != EFI_SUCCESS) + goto free_handle; + + status = setup_gop(si, proto, size, gop_handle); + +free_handle: + efi_bs_call(free_pool, gop_handle); + return status; +} diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c new file mode 100644 index 000000000..feef8d4be --- /dev/null +++ b/drivers/firmware/efi/libstub/mem.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/efi.h> +#include <asm/efi.h> + +#include "efistub.h" + +static inline bool mmap_has_headroom(unsigned long buff_size, + unsigned long map_size, + unsigned long desc_size) +{ + unsigned long slack = buff_size - map_size; + + return slack / desc_size >= EFI_MMAP_NR_SLACK_SLOTS; +} + +/** + * efi_get_memory_map() - get memory map + * @map: on return pointer to memory map + * + * Retrieve the UEFI memory map. The allocated memory leaves room for + * up to EFI_MMAP_NR_SLACK_SLOTS additional memory map entries. + * + * Return: status code + */ +efi_status_t efi_get_memory_map(struct efi_boot_memmap *map) +{ + efi_memory_desc_t *m = NULL; + efi_status_t status; + unsigned long key; + u32 desc_version; + + *map->desc_size = sizeof(*m); + *map->map_size = *map->desc_size * 32; + *map->buff_size = *map->map_size; +again: + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, + *map->map_size, (void **)&m); + if (status != EFI_SUCCESS) + goto fail; + + *map->desc_size = 0; + key = 0; + status = efi_bs_call(get_memory_map, map->map_size, m, + &key, map->desc_size, &desc_version); + if (status == EFI_BUFFER_TOO_SMALL || + !mmap_has_headroom(*map->buff_size, *map->map_size, + *map->desc_size)) { + efi_bs_call(free_pool, m); + /* + * Make sure there is some entries of headroom so that the + * buffer can be reused for a new map after allocations are + * no longer permitted. Its unlikely that the map will grow to + * exceed this headroom once we are ready to trigger + * ExitBootServices() + */ + *map->map_size += *map->desc_size * EFI_MMAP_NR_SLACK_SLOTS; + *map->buff_size = *map->map_size; + goto again; + } + + if (status == EFI_SUCCESS) { + if (map->key_ptr) + *map->key_ptr = key; + if (map->desc_ver) + *map->desc_ver = desc_version; + } else { + efi_bs_call(free_pool, m); + } + +fail: + *map->map = m; + return status; +} + +/** + * efi_allocate_pages() - Allocate memory pages + * @size: minimum number of bytes to allocate + * @addr: On return the address of the first allocated page. The first + * allocated page has alignment EFI_ALLOC_ALIGN which is an + * architecture dependent multiple of the page size. + * @max: the address that the last allocated memory page shall not + * exceed + * + * Allocate pages as EFI_LOADER_DATA. The allocated pages are aligned according + * to EFI_ALLOC_ALIGN. The last allocated page will not exceed the address + * given by @max. + * + * Return: status code + */ +efi_status_t efi_allocate_pages(unsigned long size, unsigned long *addr, + unsigned long max) +{ + efi_physical_addr_t alloc_addr; + efi_status_t status; + + if (EFI_ALLOC_ALIGN > EFI_PAGE_SIZE) + return efi_allocate_pages_aligned(size, addr, max, + EFI_ALLOC_ALIGN); + + alloc_addr = ALIGN_DOWN(max + 1, EFI_ALLOC_ALIGN) - 1; + status = efi_bs_call(allocate_pages, EFI_ALLOCATE_MAX_ADDRESS, + EFI_LOADER_DATA, DIV_ROUND_UP(size, EFI_PAGE_SIZE), + &alloc_addr); + if (status != EFI_SUCCESS) + return status; + + *addr = alloc_addr; + return EFI_SUCCESS; +} + +/** + * efi_free() - free memory pages + * @size: size of the memory area to free in bytes + * @addr: start of the memory area to free (must be EFI_PAGE_SIZE + * aligned) + * + * @size is rounded up to a multiple of EFI_ALLOC_ALIGN which is an + * architecture specific multiple of EFI_PAGE_SIZE. So this function should + * only be used to return pages allocated with efi_allocate_pages() or + * efi_low_alloc_above(). + */ +void efi_free(unsigned long size, unsigned long addr) +{ + unsigned long nr_pages; + + if (!size) + return; + + nr_pages = round_up(size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE; + efi_bs_call(free_pages, addr, nr_pages); +} diff --git a/drivers/firmware/efi/libstub/pci.c b/drivers/firmware/efi/libstub/pci.c new file mode 100644 index 000000000..99fb25d2b --- /dev/null +++ b/drivers/firmware/efi/libstub/pci.c @@ -0,0 +1,114 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PCI-related functions used by the EFI stub on multiple + * architectures. + * + * Copyright 2019 Google, LLC + */ + +#include <linux/efi.h> +#include <linux/pci.h> + +#include <asm/efi.h> + +#include "efistub.h" + +void efi_pci_disable_bridge_busmaster(void) +{ + efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; + unsigned long pci_handle_size = 0; + efi_handle_t *pci_handle = NULL; + efi_handle_t handle; + efi_status_t status; + u16 class, command; + int i; + + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, &pci_proto, + NULL, &pci_handle_size, NULL); + + if (status != EFI_BUFFER_TOO_SMALL) { + if (status != EFI_SUCCESS && status != EFI_NOT_FOUND) + efi_err("Failed to locate PCI I/O handles'\n"); + return; + } + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, pci_handle_size, + (void **)&pci_handle); + if (status != EFI_SUCCESS) { + efi_err("Failed to allocate memory for 'pci_handle'\n"); + return; + } + + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, &pci_proto, + NULL, &pci_handle_size, pci_handle); + if (status != EFI_SUCCESS) { + efi_err("Failed to locate PCI I/O handles'\n"); + goto free_handle; + } + + for_each_efi_handle(handle, pci_handle, pci_handle_size, i) { + efi_pci_io_protocol_t *pci; + unsigned long segment_nr, bus_nr, device_nr, func_nr; + + status = efi_bs_call(handle_protocol, handle, &pci_proto, + (void **)&pci); + if (status != EFI_SUCCESS) + continue; + + /* + * Disregard devices living on bus 0 - these are not behind a + * bridge so no point in disconnecting them from their drivers. + */ + status = efi_call_proto(pci, get_location, &segment_nr, &bus_nr, + &device_nr, &func_nr); + if (status != EFI_SUCCESS || bus_nr == 0) + continue; + + /* + * Don't disconnect VGA controllers so we don't risk losing + * access to the framebuffer. Drivers for true PCIe graphics + * controllers that are behind a PCIe root port do not use + * DMA to implement the GOP framebuffer anyway [although they + * may use it in their implementation of Gop->Blt()], and so + * disabling DMA in the PCI bridge should not interfere with + * normal operation of the device. + */ + status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, + PCI_CLASS_DEVICE, 1, &class); + if (status != EFI_SUCCESS || class == PCI_CLASS_DISPLAY_VGA) + continue; + + /* Disconnect this handle from all its drivers */ + efi_bs_call(disconnect_controller, handle, NULL, NULL); + } + + for_each_efi_handle(handle, pci_handle, pci_handle_size, i) { + efi_pci_io_protocol_t *pci; + + status = efi_bs_call(handle_protocol, handle, &pci_proto, + (void **)&pci); + if (status != EFI_SUCCESS || !pci) + continue; + + status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, + PCI_CLASS_DEVICE, 1, &class); + + if (status != EFI_SUCCESS || class != PCI_CLASS_BRIDGE_PCI) + continue; + + /* Disable busmastering */ + status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, + PCI_COMMAND, 1, &command); + if (status != EFI_SUCCESS || !(command & PCI_COMMAND_MASTER)) + continue; + + command &= ~PCI_COMMAND_MASTER; + status = efi_call_proto(pci, pci.write, EfiPciIoWidthUint16, + PCI_COMMAND, 1, &command); + if (status != EFI_SUCCESS) + efi_err("Failed to disable PCI busmastering\n"); + } + +free_handle: + efi_bs_call(free_pool, pci_handle); +} diff --git a/drivers/firmware/efi/libstub/random.c b/drivers/firmware/efi/libstub/random.c new file mode 100644 index 000000000..f85d2c066 --- /dev/null +++ b/drivers/firmware/efi/libstub/random.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2016 Linaro Ltd; <ard.biesheuvel@linaro.org> + */ + +#include <linux/efi.h> +#include <asm/efi.h> + +#include "efistub.h" + +typedef union efi_rng_protocol efi_rng_protocol_t; + +union efi_rng_protocol { + struct { + efi_status_t (__efiapi *get_info)(efi_rng_protocol_t *, + unsigned long *, + efi_guid_t *); + efi_status_t (__efiapi *get_rng)(efi_rng_protocol_t *, + efi_guid_t *, unsigned long, + u8 *out); + }; + struct { + u32 get_info; + u32 get_rng; + } mixed_mode; +}; + +/** + * efi_get_random_bytes() - fill a buffer with random bytes + * @size: size of the buffer + * @out: caller allocated buffer to receive the random bytes + * + * The call will fail if either the firmware does not implement the + * EFI_RNG_PROTOCOL or there are not enough random bytes available to fill + * the buffer. + * + * Return: status code + */ +efi_status_t efi_get_random_bytes(unsigned long size, u8 *out) +{ + efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID; + efi_status_t status; + efi_rng_protocol_t *rng = NULL; + + status = efi_bs_call(locate_protocol, &rng_proto, NULL, (void **)&rng); + if (status != EFI_SUCCESS) + return status; + + return efi_call_proto(rng, get_rng, NULL, size, out); +} + +/** + * efi_random_get_seed() - provide random seed as configuration table + * + * The EFI_RNG_PROTOCOL is used to read random bytes. These random bytes are + * saved as a configuration table which can be used as entropy by the kernel + * for the initialization of its pseudo random number generator. + * + * If the EFI_RNG_PROTOCOL is not available or there are not enough random bytes + * available, the configuration table will not be installed and an error code + * will be returned. + * + * Return: status code + */ +efi_status_t efi_random_get_seed(void) +{ + efi_guid_t rng_proto = EFI_RNG_PROTOCOL_GUID; + efi_guid_t rng_algo_raw = EFI_RNG_ALGORITHM_RAW; + efi_guid_t rng_table_guid = LINUX_EFI_RANDOM_SEED_TABLE_GUID; + struct linux_efi_random_seed *prev_seed, *seed = NULL; + int prev_seed_size = 0, seed_size = EFI_RANDOM_SEED_SIZE; + efi_rng_protocol_t *rng = NULL; + efi_status_t status; + + status = efi_bs_call(locate_protocol, &rng_proto, NULL, (void **)&rng); + if (status != EFI_SUCCESS) + return status; + + /* + * Check whether a seed was provided by a prior boot stage. In that + * case, instead of overwriting it, let's create a new buffer that can + * hold both, and concatenate the existing and the new seeds. + * Note that we should read the seed size with caution, in case the + * table got corrupted in memory somehow. + */ + prev_seed = get_efi_config_table(LINUX_EFI_RANDOM_SEED_TABLE_GUID); + if (prev_seed && prev_seed->size <= 512U) { + prev_seed_size = prev_seed->size; + seed_size += prev_seed_size; + } + + /* + * Use EFI_ACPI_RECLAIM_MEMORY here so that it is guaranteed that the + * allocation will survive a kexec reboot (although we refresh the seed + * beforehand) + */ + status = efi_bs_call(allocate_pool, EFI_ACPI_RECLAIM_MEMORY, + struct_size(seed, bits, seed_size), + (void **)&seed); + if (status != EFI_SUCCESS) { + efi_warn("Failed to allocate memory for RNG seed.\n"); + goto err_warn; + } + + status = efi_call_proto(rng, get_rng, &rng_algo_raw, + EFI_RANDOM_SEED_SIZE, seed->bits); + + if (status == EFI_UNSUPPORTED) + /* + * Use whatever algorithm we have available if the raw algorithm + * is not implemented. + */ + status = efi_call_proto(rng, get_rng, NULL, + EFI_RANDOM_SEED_SIZE, seed->bits); + + if (status != EFI_SUCCESS) + goto err_freepool; + + seed->size = seed_size; + if (prev_seed_size) + memcpy(seed->bits + EFI_RANDOM_SEED_SIZE, prev_seed->bits, + prev_seed_size); + + status = efi_bs_call(install_configuration_table, &rng_table_guid, seed); + if (status != EFI_SUCCESS) + goto err_freepool; + + if (prev_seed_size) { + /* wipe and free the old seed if we managed to install the new one */ + memzero_explicit(prev_seed->bits, prev_seed_size); + efi_bs_call(free_pool, prev_seed); + } + return EFI_SUCCESS; + +err_freepool: + memzero_explicit(seed, struct_size(seed, bits, seed_size)); + efi_bs_call(free_pool, seed); + efi_warn("Failed to obtain seed from EFI_RNG_PROTOCOL\n"); +err_warn: + if (prev_seed) + efi_warn("Retaining bootloader-supplied seed only"); + return status; +} diff --git a/drivers/firmware/efi/libstub/randomalloc.c b/drivers/firmware/efi/libstub/randomalloc.c new file mode 100644 index 000000000..724155b9e --- /dev/null +++ b/drivers/firmware/efi/libstub/randomalloc.c @@ -0,0 +1,128 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2016 Linaro Ltd; <ard.biesheuvel@linaro.org> + */ + +#include <linux/efi.h> +#include <linux/log2.h> +#include <asm/efi.h> + +#include "efistub.h" + +/* + * Return the number of slots covered by this entry, i.e., the number of + * addresses it covers that are suitably aligned and supply enough room + * for the allocation. + */ +static unsigned long get_entry_num_slots(efi_memory_desc_t *md, + unsigned long size, + unsigned long align_shift) +{ + unsigned long align = 1UL << align_shift; + u64 first_slot, last_slot, region_end; + + if (md->type != EFI_CONVENTIONAL_MEMORY) + return 0; + + if (efi_soft_reserve_enabled() && + (md->attribute & EFI_MEMORY_SP)) + return 0; + + region_end = min(md->phys_addr + md->num_pages * EFI_PAGE_SIZE - 1, + (u64)ULONG_MAX); + if (region_end < size) + return 0; + + first_slot = round_up(md->phys_addr, align); + last_slot = round_down(region_end - size + 1, align); + + if (first_slot > last_slot) + return 0; + + return ((unsigned long)(last_slot - first_slot) >> align_shift) + 1; +} + +/* + * The UEFI memory descriptors have a virtual address field that is only used + * when installing the virtual mapping using SetVirtualAddressMap(). Since it + * is unused here, we can reuse it to keep track of each descriptor's slot + * count. + */ +#define MD_NUM_SLOTS(md) ((md)->virt_addr) + +efi_status_t efi_random_alloc(unsigned long size, + unsigned long align, + unsigned long *addr, + unsigned long random_seed) +{ + unsigned long map_size, desc_size, total_slots = 0, target_slot; + unsigned long buff_size; + efi_status_t status; + efi_memory_desc_t *memory_map; + int map_offset; + struct efi_boot_memmap map; + + map.map = &memory_map; + map.map_size = &map_size; + map.desc_size = &desc_size; + map.desc_ver = NULL; + map.key_ptr = NULL; + map.buff_size = &buff_size; + + status = efi_get_memory_map(&map); + if (status != EFI_SUCCESS) + return status; + + if (align < EFI_ALLOC_ALIGN) + align = EFI_ALLOC_ALIGN; + + size = round_up(size, EFI_ALLOC_ALIGN); + + /* count the suitable slots in each memory map entry */ + for (map_offset = 0; map_offset < map_size; map_offset += desc_size) { + efi_memory_desc_t *md = (void *)memory_map + map_offset; + unsigned long slots; + + slots = get_entry_num_slots(md, size, ilog2(align)); + MD_NUM_SLOTS(md) = slots; + total_slots += slots; + } + + /* find a random number between 0 and total_slots */ + target_slot = (total_slots * (u64)(random_seed & U32_MAX)) >> 32; + + /* + * target_slot is now a value in the range [0, total_slots), and so + * it corresponds with exactly one of the suitable slots we recorded + * when iterating over the memory map the first time around. + * + * So iterate over the memory map again, subtracting the number of + * slots of each entry at each iteration, until we have found the entry + * that covers our chosen slot. Use the residual value of target_slot + * to calculate the randomly chosen address, and allocate it directly + * using EFI_ALLOCATE_ADDRESS. + */ + for (map_offset = 0; map_offset < map_size; map_offset += desc_size) { + efi_memory_desc_t *md = (void *)memory_map + map_offset; + efi_physical_addr_t target; + unsigned long pages; + + if (target_slot >= MD_NUM_SLOTS(md)) { + target_slot -= MD_NUM_SLOTS(md); + continue; + } + + target = round_up(md->phys_addr, align) + target_slot * align; + pages = size / EFI_PAGE_SIZE; + + status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, + EFI_LOADER_DATA, pages, &target); + if (status == EFI_SUCCESS) + *addr = target; + break; + } + + efi_bs_call(free_pool, memory_map); + + return status; +} diff --git a/drivers/firmware/efi/libstub/relocate.c b/drivers/firmware/efi/libstub/relocate.c new file mode 100644 index 000000000..8ee9eb2b9 --- /dev/null +++ b/drivers/firmware/efi/libstub/relocate.c @@ -0,0 +1,174 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/efi.h> +#include <asm/efi.h> + +#include "efistub.h" + +/** + * efi_low_alloc_above() - allocate pages at or above given address + * @size: size of the memory area to allocate + * @align: minimum alignment of the allocated memory area. It should + * a power of two. + * @addr: on exit the address of the allocated memory + * @min: minimum address to used for the memory allocation + * + * Allocate at the lowest possible address that is not below @min as + * EFI_LOADER_DATA. The allocated pages are aligned according to @align but at + * least EFI_ALLOC_ALIGN. The first allocated page will not below the address + * given by @min. + * + * Return: status code + */ +efi_status_t efi_low_alloc_above(unsigned long size, unsigned long align, + unsigned long *addr, unsigned long min) +{ + unsigned long map_size, desc_size, buff_size; + efi_memory_desc_t *map; + efi_status_t status; + unsigned long nr_pages; + int i; + struct efi_boot_memmap boot_map; + + boot_map.map = ↦ + boot_map.map_size = &map_size; + boot_map.desc_size = &desc_size; + boot_map.desc_ver = NULL; + boot_map.key_ptr = NULL; + boot_map.buff_size = &buff_size; + + status = efi_get_memory_map(&boot_map); + if (status != EFI_SUCCESS) + goto fail; + + /* + * Enforce minimum alignment that EFI or Linux requires when + * requesting a specific address. We are doing page-based (or + * larger) allocations, and both the address and size must meet + * alignment constraints. + */ + if (align < EFI_ALLOC_ALIGN) + align = EFI_ALLOC_ALIGN; + + size = round_up(size, EFI_ALLOC_ALIGN); + nr_pages = size / EFI_PAGE_SIZE; + for (i = 0; i < map_size / desc_size; i++) { + efi_memory_desc_t *desc; + unsigned long m = (unsigned long)map; + u64 start, end; + + desc = efi_early_memdesc_ptr(m, desc_size, i); + + if (desc->type != EFI_CONVENTIONAL_MEMORY) + continue; + + if (efi_soft_reserve_enabled() && + (desc->attribute & EFI_MEMORY_SP)) + continue; + + if (desc->num_pages < nr_pages) + continue; + + start = desc->phys_addr; + end = start + desc->num_pages * EFI_PAGE_SIZE; + + if (start < min) + start = min; + + start = round_up(start, align); + if ((start + size) > end) + continue; + + status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, + EFI_LOADER_DATA, nr_pages, &start); + if (status == EFI_SUCCESS) { + *addr = start; + break; + } + } + + if (i == map_size / desc_size) + status = EFI_NOT_FOUND; + + efi_bs_call(free_pool, map); +fail: + return status; +} + +/** + * efi_relocate_kernel() - copy memory area + * @image_addr: pointer to address of memory area to copy + * @image_size: size of memory area to copy + * @alloc_size: minimum size of memory to allocate, must be greater or + * equal to image_size + * @preferred_addr: preferred target address + * @alignment: minimum alignment of the allocated memory area. It + * should be a power of two. + * @min_addr: minimum target address + * + * Copy a memory area to a newly allocated memory area aligned according + * to @alignment but at least EFI_ALLOC_ALIGN. If the preferred address + * is not available, the allocated address will not be below @min_addr. + * On exit, @image_addr is updated to the target copy address that was used. + * + * This function is used to copy the Linux kernel verbatim. It does not apply + * any relocation changes. + * + * Return: status code + */ +efi_status_t efi_relocate_kernel(unsigned long *image_addr, + unsigned long image_size, + unsigned long alloc_size, + unsigned long preferred_addr, + unsigned long alignment, + unsigned long min_addr) +{ + unsigned long cur_image_addr; + unsigned long new_addr = 0; + efi_status_t status; + unsigned long nr_pages; + efi_physical_addr_t efi_addr = preferred_addr; + + if (!image_addr || !image_size || !alloc_size) + return EFI_INVALID_PARAMETER; + if (alloc_size < image_size) + return EFI_INVALID_PARAMETER; + + cur_image_addr = *image_addr; + + /* + * The EFI firmware loader could have placed the kernel image + * anywhere in memory, but the kernel has restrictions on the + * max physical address it can run at. Some architectures + * also have a preferred address, so first try to relocate + * to the preferred address. If that fails, allocate as low + * as possible while respecting the required alignment. + */ + nr_pages = round_up(alloc_size, EFI_ALLOC_ALIGN) / EFI_PAGE_SIZE; + status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS, + EFI_LOADER_DATA, nr_pages, &efi_addr); + new_addr = efi_addr; + /* + * If preferred address allocation failed allocate as low as + * possible. + */ + if (status != EFI_SUCCESS) { + status = efi_low_alloc_above(alloc_size, alignment, &new_addr, + min_addr); + } + if (status != EFI_SUCCESS) { + efi_err("Failed to allocate usable memory for kernel.\n"); + return status; + } + + /* + * We know source/dest won't overlap since both memory ranges + * have been allocated by UEFI, so we can safely use memcpy. + */ + memcpy((void *)new_addr, (void *)cur_image_addr, image_size); + + /* Return the new address of the relocated image. */ + *image_addr = new_addr; + + return status; +} diff --git a/drivers/firmware/efi/libstub/riscv-stub.c b/drivers/firmware/efi/libstub/riscv-stub.c new file mode 100644 index 000000000..9c4608434 --- /dev/null +++ b/drivers/firmware/efi/libstub/riscv-stub.c @@ -0,0 +1,112 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020 Western Digital Corporation or its affiliates. + */ + +#include <linux/efi.h> +#include <linux/libfdt.h> + +#include <asm/efi.h> +#include <asm/sections.h> + +#include "efistub.h" + +/* + * RISC-V requires the kernel image to placed 2 MB aligned base for 64 bit and + * 4MB for 32 bit. + */ +#ifdef CONFIG_64BIT +#define MIN_KIMG_ALIGN SZ_2M +#else +#define MIN_KIMG_ALIGN SZ_4M +#endif + +typedef void __noreturn (*jump_kernel_func)(unsigned int, unsigned long); + +static u32 hartid; + +static int get_boot_hartid_from_fdt(void) +{ + const void *fdt; + int chosen_node, len; + const fdt32_t *prop; + + fdt = get_efi_config_table(DEVICE_TREE_GUID); + if (!fdt) + return -EINVAL; + + chosen_node = fdt_path_offset(fdt, "/chosen"); + if (chosen_node < 0) + return -EINVAL; + + prop = fdt_getprop((void *)fdt, chosen_node, "boot-hartid", &len); + if (!prop || len != sizeof(u32)) + return -EINVAL; + + hartid = fdt32_to_cpu(*prop); + return 0; +} + +efi_status_t check_platform_features(void) +{ + int ret; + + ret = get_boot_hartid_from_fdt(); + if (ret) { + efi_err("/chosen/boot-hartid missing or invalid!\n"); + return EFI_UNSUPPORTED; + } + return EFI_SUCCESS; +} + +void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt, + unsigned long fdt_size) +{ + unsigned long stext_offset = _start_kernel - _start; + unsigned long kernel_entry = entrypoint + stext_offset; + jump_kernel_func jump_kernel = (jump_kernel_func)kernel_entry; + + /* + * Jump to real kernel here with following constraints. + * 1. MMU should be disabled. + * 2. a0 should contain hartid + * 3. a1 should DT address + */ + csr_write(CSR_SATP, 0); + jump_kernel(hartid, fdt); +} + +efi_status_t handle_kernel_image(unsigned long *image_addr, + unsigned long *image_size, + unsigned long *reserve_addr, + unsigned long *reserve_size, + efi_loaded_image_t *image) +{ + unsigned long kernel_size = 0; + unsigned long preferred_addr; + efi_status_t status; + + kernel_size = _edata - _start; + *image_addr = (unsigned long)_start; + *image_size = kernel_size + (_end - _edata); + + /* + * RISC-V kernel maps PAGE_OFFSET virtual address to the same physical + * address where kernel is booted. That's why kernel should boot from + * as low as possible to avoid wastage of memory. Currently, dram_base + * is occupied by the firmware. So the preferred address for kernel to + * boot is next aligned address. If preferred address is not available, + * relocate_kernel will fall back to efi_low_alloc_above to allocate + * lowest possible memory region as long as the address and size meets + * the alignment constraints. + */ + preferred_addr = MIN_KIMG_ALIGN; + status = efi_relocate_kernel(image_addr, kernel_size, *image_size, + preferred_addr, MIN_KIMG_ALIGN, 0x0); + + if (status != EFI_SUCCESS) { + efi_err("Failed to relocate kernel\n"); + *image_size = 0; + } + return status; +} diff --git a/drivers/firmware/efi/libstub/secureboot.c b/drivers/firmware/efi/libstub/secureboot.c new file mode 100644 index 000000000..a2be3a71b --- /dev/null +++ b/drivers/firmware/efi/libstub/secureboot.c @@ -0,0 +1,76 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Secure boot handling. + * + * Copyright (C) 2013,2014 Linaro Limited + * Roy Franz <roy.franz@linaro.org + * Copyright (C) 2013 Red Hat, Inc. + * Mark Salter <msalter@redhat.com> + */ +#include <linux/efi.h> +#include <asm/efi.h> + +#include "efistub.h" + +/* BIOS variables */ +static const efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID; +static const efi_char16_t efi_SecureBoot_name[] = L"SecureBoot"; +static const efi_char16_t efi_SetupMode_name[] = L"SetupMode"; + +/* SHIM variables */ +static const efi_guid_t shim_guid = EFI_SHIM_LOCK_GUID; +static const efi_char16_t shim_MokSBState_name[] = L"MokSBStateRT"; + +/* + * Determine whether we're in secure boot mode. + * + * Please keep the logic in sync with + * arch/x86/xen/efi.c:xen_efi_get_secureboot(). + */ +enum efi_secureboot_mode efi_get_secureboot(void) +{ + u32 attr; + u8 secboot, setupmode, moksbstate; + unsigned long size; + efi_status_t status; + + size = sizeof(secboot); + status = get_efi_var(efi_SecureBoot_name, &efi_variable_guid, + NULL, &size, &secboot); + if (status == EFI_NOT_FOUND) + return efi_secureboot_mode_disabled; + if (status != EFI_SUCCESS) + goto out_efi_err; + + size = sizeof(setupmode); + status = get_efi_var(efi_SetupMode_name, &efi_variable_guid, + NULL, &size, &setupmode); + if (status != EFI_SUCCESS) + goto out_efi_err; + + if (secboot == 0 || setupmode == 1) + return efi_secureboot_mode_disabled; + + /* + * See if a user has put the shim into insecure mode. If so, and if the + * variable doesn't have the non-volatile attribute set, we might as + * well honor that. + */ + size = sizeof(moksbstate); + status = get_efi_var(shim_MokSBState_name, &shim_guid, + &attr, &size, &moksbstate); + + /* If it fails, we don't care why. Default to secure */ + if (status != EFI_SUCCESS) + goto secure_boot_enabled; + if (!(attr & EFI_VARIABLE_NON_VOLATILE) && moksbstate == 1) + return efi_secureboot_mode_disabled; + +secure_boot_enabled: + efi_info("UEFI Secure Boot is enabled.\n"); + return efi_secureboot_mode_enabled; + +out_efi_err: + efi_err("Could not determine UEFI Secure Boot status.\n"); + return efi_secureboot_mode_unknown; +} diff --git a/drivers/firmware/efi/libstub/skip_spaces.c b/drivers/firmware/efi/libstub/skip_spaces.c new file mode 100644 index 000000000..159fb4e45 --- /dev/null +++ b/drivers/firmware/efi/libstub/skip_spaces.c @@ -0,0 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/ctype.h> +#include <linux/string.h> +#include <linux/types.h> + +char *skip_spaces(const char *str) +{ + while (isspace(*str)) + ++str; + return (char *)str; +} diff --git a/drivers/firmware/efi/libstub/string.c b/drivers/firmware/efi/libstub/string.c new file mode 100644 index 000000000..5d13e4386 --- /dev/null +++ b/drivers/firmware/efi/libstub/string.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Taken from: + * linux/lib/string.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + */ + +#include <linux/ctype.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/string.h> + +#ifndef __HAVE_ARCH_STRSTR +/** + * strstr - Find the first substring in a %NUL terminated string + * @s1: The string to be searched + * @s2: The string to search for + */ +char *strstr(const char *s1, const char *s2) +{ + size_t l1, l2; + + l2 = strlen(s2); + if (!l2) + return (char *)s1; + l1 = strlen(s1); + while (l1 >= l2) { + l1--; + if (!memcmp(s1, s2, l2)) + return (char *)s1; + s1++; + } + return NULL; +} +#endif + +#ifndef __HAVE_ARCH_STRNCMP +/** + * strncmp - Compare two length-limited strings + * @cs: One string + * @ct: Another string + * @count: The maximum number of bytes to compare + */ +int strncmp(const char *cs, const char *ct, size_t count) +{ + unsigned char c1, c2; + + while (count) { + c1 = *cs++; + c2 = *ct++; + if (c1 != c2) + return c1 < c2 ? -1 : 1; + if (!c1) + break; + count--; + } + return 0; +} +#endif + +/* Works only for digits and letters, but small and fast */ +#define TOLOWER(x) ((x) | 0x20) + +static unsigned int simple_guess_base(const char *cp) +{ + if (cp[0] == '0') { + if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) + return 16; + else + return 8; + } else { + return 10; + } +} + +/** + * simple_strtoull - convert a string to an unsigned long long + * @cp: The start of the string + * @endp: A pointer to the end of the parsed string will be placed here + * @base: The number base to use + */ + +unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) +{ + unsigned long long result = 0; + + if (!base) + base = simple_guess_base(cp); + + if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') + cp += 2; + + while (isxdigit(*cp)) { + unsigned int value; + + value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; + if (value >= base) + break; + result = result * base + value; + cp++; + } + if (endp) + *endp = (char *)cp; + + return result; +} + +long simple_strtol(const char *cp, char **endp, unsigned int base) +{ + if (*cp == '-') + return -simple_strtoull(cp + 1, endp, base); + + return simple_strtoull(cp, endp, base); +} diff --git a/drivers/firmware/efi/libstub/tpm.c b/drivers/firmware/efi/libstub/tpm.c new file mode 100644 index 000000000..7acbac16e --- /dev/null +++ b/drivers/firmware/efi/libstub/tpm.c @@ -0,0 +1,167 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * TPM handling. + * + * Copyright (C) 2016 CoreOS, Inc + * Copyright (C) 2017 Google, Inc. + * Matthew Garrett <mjg59@google.com> + * Thiebaud Weksteen <tweek@google.com> + */ +#include <linux/efi.h> +#include <linux/tpm_eventlog.h> +#include <asm/efi.h> + +#include "efistub.h" + +#ifdef CONFIG_RESET_ATTACK_MITIGATION +static const efi_char16_t efi_MemoryOverWriteRequest_name[] = + L"MemoryOverwriteRequestControl"; + +#define MEMORY_ONLY_RESET_CONTROL_GUID \ + EFI_GUID(0xe20939be, 0x32d4, 0x41be, 0xa1, 0x50, 0x89, 0x7f, 0x85, 0xd4, 0x98, 0x29) + +/* + * Enable reboot attack mitigation. This requests that the firmware clear the + * RAM on next reboot before proceeding with boot, ensuring that any secrets + * are cleared. If userland has ensured that all secrets have been removed + * from RAM before reboot it can simply reset this variable. + */ +void efi_enable_reset_attack_mitigation(void) +{ + u8 val = 1; + efi_guid_t var_guid = MEMORY_ONLY_RESET_CONTROL_GUID; + efi_status_t status; + unsigned long datasize = 0; + + status = get_efi_var(efi_MemoryOverWriteRequest_name, &var_guid, + NULL, &datasize, NULL); + + if (status == EFI_NOT_FOUND) + return; + + set_efi_var(efi_MemoryOverWriteRequest_name, &var_guid, + EFI_VARIABLE_NON_VOLATILE | + EFI_VARIABLE_BOOTSERVICE_ACCESS | + EFI_VARIABLE_RUNTIME_ACCESS, sizeof(val), &val); +} + +#endif + +void efi_retrieve_tpm2_eventlog(void) +{ + efi_guid_t tcg2_guid = EFI_TCG2_PROTOCOL_GUID; + efi_guid_t linux_eventlog_guid = LINUX_EFI_TPM_EVENT_LOG_GUID; + efi_status_t status; + efi_physical_addr_t log_location = 0, log_last_entry = 0; + struct linux_efi_tpm_eventlog *log_tbl = NULL; + struct efi_tcg2_final_events_table *final_events_table = NULL; + unsigned long first_entry_addr, last_entry_addr; + size_t log_size, last_entry_size; + efi_bool_t truncated; + int version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2; + efi_tcg2_protocol_t *tcg2_protocol = NULL; + int final_events_size = 0; + + status = efi_bs_call(locate_protocol, &tcg2_guid, NULL, + (void **)&tcg2_protocol); + if (status != EFI_SUCCESS) + return; + + status = efi_call_proto(tcg2_protocol, get_event_log, version, + &log_location, &log_last_entry, &truncated); + + if (status != EFI_SUCCESS || !log_location) { + version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2; + status = efi_call_proto(tcg2_protocol, get_event_log, version, + &log_location, &log_last_entry, + &truncated); + if (status != EFI_SUCCESS || !log_location) + return; + + } + + first_entry_addr = (unsigned long) log_location; + + /* + * We populate the EFI table even if the logs are empty. + */ + if (!log_last_entry) { + log_size = 0; + } else { + last_entry_addr = (unsigned long) log_last_entry; + /* + * get_event_log only returns the address of the last entry. + * We need to calculate its size to deduce the full size of + * the logs. + */ + if (version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) { + /* + * The TCG2 log format has variable length entries, + * and the information to decode the hash algorithms + * back into a size is contained in the first entry - + * pass a pointer to the final entry (to calculate its + * size) and the first entry (so we know how long each + * digest is) + */ + last_entry_size = + __calc_tpm2_event_size((void *)last_entry_addr, + (void *)(long)log_location, + false); + } else { + last_entry_size = sizeof(struct tcpa_event) + + ((struct tcpa_event *) last_entry_addr)->event_size; + } + log_size = log_last_entry - log_location + last_entry_size; + } + + /* Allocate space for the logs and copy them. */ + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, + sizeof(*log_tbl) + log_size, (void **)&log_tbl); + + if (status != EFI_SUCCESS) { + efi_err("Unable to allocate memory for event log\n"); + return; + } + + /* + * Figure out whether any events have already been logged to the + * final events structure, and if so how much space they take up + */ + if (version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) + final_events_table = get_efi_config_table(LINUX_EFI_TPM_FINAL_LOG_GUID); + if (final_events_table && final_events_table->nr_events) { + struct tcg_pcr_event2_head *header; + int offset; + void *data; + int event_size; + int i = final_events_table->nr_events; + + data = (void *)final_events_table; + offset = sizeof(final_events_table->version) + + sizeof(final_events_table->nr_events); + + while (i > 0) { + header = data + offset + final_events_size; + event_size = __calc_tpm2_event_size(header, + (void *)(long)log_location, + false); + final_events_size += event_size; + i--; + } + } + + memset(log_tbl, 0, sizeof(*log_tbl) + log_size); + log_tbl->size = log_size; + log_tbl->final_events_preboot_size = final_events_size; + log_tbl->version = version; + memcpy(log_tbl->log, (void *) first_entry_addr, log_size); + + status = efi_bs_call(install_configuration_table, + &linux_eventlog_guid, log_tbl); + if (status != EFI_SUCCESS) + goto err_free; + return; + +err_free: + efi_bs_call(free_pool, log_tbl); +} diff --git a/drivers/firmware/efi/libstub/vsprintf.c b/drivers/firmware/efi/libstub/vsprintf.c new file mode 100644 index 000000000..1088e288c --- /dev/null +++ b/drivers/firmware/efi/libstub/vsprintf.c @@ -0,0 +1,564 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* -*- linux-c -*- ------------------------------------------------------- * + * + * Copyright (C) 1991, 1992 Linus Torvalds + * Copyright 2007 rPath, Inc. - All Rights Reserved + * + * ----------------------------------------------------------------------- */ + +/* + * Oh, it's a waste of space, but oh-so-yummy for debugging. + */ + +#include <stdarg.h> + +#include <linux/compiler.h> +#include <linux/ctype.h> +#include <linux/kernel.h> +#include <linux/limits.h> +#include <linux/string.h> +#include <linux/types.h> + +static +int skip_atoi(const char **s) +{ + int i = 0; + + while (isdigit(**s)) + i = i * 10 + *((*s)++) - '0'; + return i; +} + +/* + * put_dec_full4 handles numbers in the range 0 <= r < 10000. + * The multiplier 0xccd is round(2^15/10), and the approximation + * r/10 == (r * 0xccd) >> 15 is exact for all r < 16389. + */ +static +void put_dec_full4(char *end, unsigned int r) +{ + int i; + + for (i = 0; i < 3; i++) { + unsigned int q = (r * 0xccd) >> 15; + *--end = '0' + (r - q * 10); + r = q; + } + *--end = '0' + r; +} + +/* put_dec is copied from lib/vsprintf.c with small modifications */ + +/* + * Call put_dec_full4 on x % 10000, return x / 10000. + * The approximation x/10000 == (x * 0x346DC5D7) >> 43 + * holds for all x < 1,128,869,999. The largest value this + * helper will ever be asked to convert is 1,125,520,955. + * (second call in the put_dec code, assuming n is all-ones). + */ +static +unsigned int put_dec_helper4(char *end, unsigned int x) +{ + unsigned int q = (x * 0x346DC5D7ULL) >> 43; + + put_dec_full4(end, x - q * 10000); + return q; +} + +/* Based on code by Douglas W. Jones found at + * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour> + * (with permission from the author). + * Performs no 64-bit division and hence should be fast on 32-bit machines. + */ +static +char *put_dec(char *end, unsigned long long n) +{ + unsigned int d3, d2, d1, q, h; + char *p = end; + + d1 = ((unsigned int)n >> 16); /* implicit "& 0xffff" */ + h = (n >> 32); + d2 = (h ) & 0xffff; + d3 = (h >> 16); /* implicit "& 0xffff" */ + + /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0 + = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */ + q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((unsigned int)n & 0xffff); + q = put_dec_helper4(p, q); + p -= 4; + + q += 7671 * d3 + 9496 * d2 + 6 * d1; + q = put_dec_helper4(p, q); + p -= 4; + + q += 4749 * d3 + 42 * d2; + q = put_dec_helper4(p, q); + p -= 4; + + q += 281 * d3; + q = put_dec_helper4(p, q); + p -= 4; + + put_dec_full4(p, q); + p -= 4; + + /* strip off the extra 0's we printed */ + while (p < end && *p == '0') + ++p; + + return p; +} + +static +char *number(char *end, unsigned long long num, int base, char locase) +{ + /* + * locase = 0 or 0x20. ORing digits or letters with 'locase' + * produces same digits or (maybe lowercased) letters + */ + + /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ + static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ + + switch (base) { + case 10: + if (num != 0) + end = put_dec(end, num); + break; + case 8: + for (; num != 0; num >>= 3) + *--end = '0' + (num & 07); + break; + case 16: + for (; num != 0; num >>= 4) + *--end = digits[num & 0xf] | locase; + break; + default: + unreachable(); + } + + return end; +} + +#define ZEROPAD 1 /* pad with zero */ +#define SIGN 2 /* unsigned/signed long */ +#define PLUS 4 /* show plus */ +#define SPACE 8 /* space if plus */ +#define LEFT 16 /* left justified */ +#define SMALL 32 /* Must be 32 == 0x20 */ +#define SPECIAL 64 /* 0x */ +#define WIDE 128 /* UTF-16 string */ + +static +int get_flags(const char **fmt) +{ + int flags = 0; + + do { + switch (**fmt) { + case '-': + flags |= LEFT; + break; + case '+': + flags |= PLUS; + break; + case ' ': + flags |= SPACE; + break; + case '#': + flags |= SPECIAL; + break; + case '0': + flags |= ZEROPAD; + break; + default: + return flags; + } + ++(*fmt); + } while (1); +} + +static +int get_int(const char **fmt, va_list *ap) +{ + if (isdigit(**fmt)) + return skip_atoi(fmt); + if (**fmt == '*') { + ++(*fmt); + /* it's the next argument */ + return va_arg(*ap, int); + } + return 0; +} + +static +unsigned long long get_number(int sign, int qualifier, va_list *ap) +{ + if (sign) { + switch (qualifier) { + case 'L': + return va_arg(*ap, long long); + case 'l': + return va_arg(*ap, long); + case 'h': + return (short)va_arg(*ap, int); + case 'H': + return (signed char)va_arg(*ap, int); + default: + return va_arg(*ap, int); + }; + } else { + switch (qualifier) { + case 'L': + return va_arg(*ap, unsigned long long); + case 'l': + return va_arg(*ap, unsigned long); + case 'h': + return (unsigned short)va_arg(*ap, int); + case 'H': + return (unsigned char)va_arg(*ap, int); + default: + return va_arg(*ap, unsigned int); + } + } +} + +static +char get_sign(long long *num, int flags) +{ + if (!(flags & SIGN)) + return 0; + if (*num < 0) { + *num = -(*num); + return '-'; + } + if (flags & PLUS) + return '+'; + if (flags & SPACE) + return ' '; + return 0; +} + +static +size_t utf16s_utf8nlen(const u16 *s16, size_t maxlen) +{ + size_t len, clen; + + for (len = 0; len < maxlen && *s16; len += clen) { + u16 c0 = *s16++; + + /* First, get the length for a BMP character */ + clen = 1 + (c0 >= 0x80) + (c0 >= 0x800); + if (len + clen > maxlen) + break; + /* + * If this is a high surrogate, and we're already at maxlen, we + * can't include the character if it's a valid surrogate pair. + * Avoid accessing one extra word just to check if it's valid + * or not. + */ + if ((c0 & 0xfc00) == 0xd800) { + if (len + clen == maxlen) + break; + if ((*s16 & 0xfc00) == 0xdc00) { + ++s16; + ++clen; + } + } + } + + return len; +} + +static +u32 utf16_to_utf32(const u16 **s16) +{ + u16 c0, c1; + + c0 = *(*s16)++; + /* not a surrogate */ + if ((c0 & 0xf800) != 0xd800) + return c0; + /* invalid: low surrogate instead of high */ + if (c0 & 0x0400) + return 0xfffd; + c1 = **s16; + /* invalid: missing low surrogate */ + if ((c1 & 0xfc00) != 0xdc00) + return 0xfffd; + /* valid surrogate pair */ + ++(*s16); + return (0x10000 - (0xd800 << 10) - 0xdc00) + (c0 << 10) + c1; +} + +#define PUTC(c) \ +do { \ + if (pos < size) \ + buf[pos] = (c); \ + ++pos; \ +} while (0); + +int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) +{ + /* The maximum space required is to print a 64-bit number in octal */ + char tmp[(sizeof(unsigned long long) * 8 + 2) / 3]; + char *tmp_end = &tmp[ARRAY_SIZE(tmp)]; + long long num; + int base; + const char *s; + size_t len, pos; + char sign; + + int flags; /* flags to number() */ + + int field_width; /* width of output field */ + int precision; /* min. # of digits for integers; max + number of chars for from string */ + int qualifier; /* 'h', 'hh', 'l' or 'll' for integer fields */ + + va_list args; + + /* + * We want to pass our input va_list to helper functions by reference, + * but there's an annoying edge case. If va_list was originally passed + * to us by value, we could just pass &ap down to the helpers. This is + * the case on, for example, X86_32. + * However, on X86_64 (and possibly others), va_list is actually a + * size-1 array containing a structure. Our function parameter ap has + * decayed from T[1] to T*, and &ap has type T** rather than T(*)[1], + * which is what will be expected by a function taking a va_list * + * parameter. + * One standard way to solve this mess is by creating a copy in a local + * variable of type va_list and then passing a pointer to that local + * copy instead, which is what we do here. + */ + va_copy(args, ap); + + for (pos = 0; *fmt; ++fmt) { + if (*fmt != '%' || *++fmt == '%') { + PUTC(*fmt); + continue; + } + + /* process flags */ + flags = get_flags(&fmt); + + /* get field width */ + field_width = get_int(&fmt, &args); + if (field_width < 0) { + field_width = -field_width; + flags |= LEFT; + } + + if (flags & LEFT) + flags &= ~ZEROPAD; + + /* get the precision */ + precision = -1; + if (*fmt == '.') { + ++fmt; + precision = get_int(&fmt, &args); + if (precision >= 0) + flags &= ~ZEROPAD; + } + + /* get the conversion qualifier */ + qualifier = -1; + if (*fmt == 'h' || *fmt == 'l') { + qualifier = *fmt; + ++fmt; + if (qualifier == *fmt) { + qualifier -= 'a'-'A'; + ++fmt; + } + } + + sign = 0; + + switch (*fmt) { + case 'c': + flags &= LEFT; + s = tmp; + if (qualifier == 'l') { + ((u16 *)tmp)[0] = (u16)va_arg(args, unsigned int); + ((u16 *)tmp)[1] = L'\0'; + precision = INT_MAX; + goto wstring; + } else { + tmp[0] = (unsigned char)va_arg(args, int); + precision = len = 1; + } + goto output; + + case 's': + flags &= LEFT; + if (precision < 0) + precision = INT_MAX; + s = va_arg(args, void *); + if (!s) + s = precision < 6 ? "" : "(null)"; + else if (qualifier == 'l') { + wstring: + flags |= WIDE; + precision = len = utf16s_utf8nlen((const u16 *)s, precision); + goto output; + } + precision = len = strnlen(s, precision); + goto output; + + /* integer number formats - set up the flags and "break" */ + case 'o': + base = 8; + break; + + case 'p': + if (precision < 0) + precision = 2 * sizeof(void *); + fallthrough; + case 'x': + flags |= SMALL; + fallthrough; + case 'X': + base = 16; + break; + + case 'd': + case 'i': + flags |= SIGN; + fallthrough; + case 'u': + flags &= ~SPECIAL; + base = 10; + break; + + default: + /* + * Bail out if the conversion specifier is invalid. + * There's probably a typo in the format string and the + * remaining specifiers are unlikely to match up with + * the arguments. + */ + goto fail; + } + if (*fmt == 'p') { + num = (unsigned long)va_arg(args, void *); + } else { + num = get_number(flags & SIGN, qualifier, &args); + } + + sign = get_sign(&num, flags); + if (sign) + --field_width; + + s = number(tmp_end, num, base, flags & SMALL); + len = tmp_end - s; + /* default precision is 1 */ + if (precision < 0) + precision = 1; + /* precision is minimum number of digits to print */ + if (precision < len) + precision = len; + if (flags & SPECIAL) { + /* + * For octal, a leading 0 is printed only if necessary, + * i.e. if it's not already there because of the + * precision. + */ + if (base == 8 && precision == len) + ++precision; + /* + * For hexadecimal, the leading 0x is skipped if the + * output is empty, i.e. both the number and the + * precision are 0. + */ + if (base == 16 && precision > 0) + field_width -= 2; + else + flags &= ~SPECIAL; + } + /* + * For zero padding, increase the precision to fill the field + * width. + */ + if ((flags & ZEROPAD) && field_width > precision) + precision = field_width; + +output: + /* Calculate the padding necessary */ + field_width -= precision; + /* Leading padding with ' ' */ + if (!(flags & LEFT)) + while (field_width-- > 0) + PUTC(' '); + /* sign */ + if (sign) + PUTC(sign); + /* 0x/0X for hexadecimal */ + if (flags & SPECIAL) { + PUTC('0'); + PUTC( 'X' | (flags & SMALL)); + } + /* Zero padding and excess precision */ + while (precision-- > len) + PUTC('0'); + /* Actual output */ + if (flags & WIDE) { + const u16 *ws = (const u16 *)s; + + while (len-- > 0) { + u32 c32 = utf16_to_utf32(&ws); + u8 *s8; + size_t clen; + + if (c32 < 0x80) { + PUTC(c32); + continue; + } + + /* Number of trailing octets */ + clen = 1 + (c32 >= 0x800) + (c32 >= 0x10000); + + len -= clen; + s8 = (u8 *)&buf[pos]; + + /* Avoid writing partial character */ + PUTC('\0'); + pos += clen; + if (pos >= size) + continue; + + /* Set high bits of leading octet */ + *s8 = (0xf00 >> 1) >> clen; + /* Write trailing octets in reverse order */ + for (s8 += clen; clen; --clen, c32 >>= 6) + *s8-- = 0x80 | (c32 & 0x3f); + /* Set low bits of leading octet */ + *s8 |= c32; + } + } else { + while (len-- > 0) + PUTC(*s++); + } + /* Trailing padding with ' ' */ + while (field_width-- > 0) + PUTC(' '); + } +fail: + va_end(args); + + if (size) + buf[min(pos, size-1)] = '\0'; + + return pos; +} + +int snprintf(char *buf, size_t size, const char *fmt, ...) +{ + va_list args; + int i; + + va_start(args, fmt); + i = vsnprintf(buf, size, fmt, args); + va_end(args); + return i; +} diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c new file mode 100644 index 000000000..9f998e6bf --- /dev/null +++ b/drivers/firmware/efi/libstub/x86-stub.c @@ -0,0 +1,817 @@ +// SPDX-License-Identifier: GPL-2.0-only + +/* ----------------------------------------------------------------------- + * + * Copyright 2011 Intel Corporation; author Matt Fleming + * + * ----------------------------------------------------------------------- */ + +#include <linux/efi.h> +#include <linux/pci.h> +#include <linux/stddef.h> + +#include <asm/efi.h> +#include <asm/e820/types.h> +#include <asm/setup.h> +#include <asm/desc.h> +#include <asm/boot.h> + +#include "efistub.h" + +/* Maximum physical address for 64-bit kernel with 4-level paging */ +#define MAXMEM_X86_64_4LEVEL (1ull << 46) + +const efi_system_table_t *efi_system_table; +extern u32 image_offset; +static efi_loaded_image_t *image = NULL; + +static efi_status_t +preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) +{ + struct pci_setup_rom *rom = NULL; + efi_status_t status; + unsigned long size; + uint64_t romsize; + void *romimage; + + /* + * Some firmware images contain EFI function pointers at the place where + * the romimage and romsize fields are supposed to be. Typically the EFI + * code is mapped at high addresses, translating to an unrealistically + * large romsize. The UEFI spec limits the size of option ROMs to 16 + * MiB so we reject any ROMs over 16 MiB in size to catch this. + */ + romimage = efi_table_attr(pci, romimage); + romsize = efi_table_attr(pci, romsize); + if (!romimage || !romsize || romsize > SZ_16M) + return EFI_INVALID_PARAMETER; + + size = romsize + sizeof(*rom); + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, + (void **)&rom); + if (status != EFI_SUCCESS) { + efi_err("Failed to allocate memory for 'rom'\n"); + return status; + } + + memset(rom, 0, sizeof(*rom)); + + rom->data.type = SETUP_PCI; + rom->data.len = size - sizeof(struct setup_data); + rom->data.next = 0; + rom->pcilen = romsize; + *__rom = rom; + + status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, + PCI_VENDOR_ID, 1, &rom->vendor); + + if (status != EFI_SUCCESS) { + efi_err("Failed to read rom->vendor\n"); + goto free_struct; + } + + status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, + PCI_DEVICE_ID, 1, &rom->devid); + + if (status != EFI_SUCCESS) { + efi_err("Failed to read rom->devid\n"); + goto free_struct; + } + + status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, + &rom->device, &rom->function); + + if (status != EFI_SUCCESS) + goto free_struct; + + memcpy(rom->romdata, romimage, romsize); + return status; + +free_struct: + efi_bs_call(free_pool, rom); + return status; +} + +/* + * There's no way to return an informative status from this function, + * because any analysis (and printing of error messages) needs to be + * done directly at the EFI function call-site. + * + * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we + * just didn't find any PCI devices, but there's no way to tell outside + * the context of the call. + */ +static void setup_efi_pci(struct boot_params *params) +{ + efi_status_t status; + void **pci_handle = NULL; + efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; + unsigned long size = 0; + struct setup_data *data; + efi_handle_t h; + int i; + + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + &pci_proto, NULL, &size, pci_handle); + + if (status == EFI_BUFFER_TOO_SMALL) { + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, + (void **)&pci_handle); + + if (status != EFI_SUCCESS) { + efi_err("Failed to allocate memory for 'pci_handle'\n"); + return; + } + + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + &pci_proto, NULL, &size, pci_handle); + } + + if (status != EFI_SUCCESS) + goto free_handle; + + data = (struct setup_data *)(unsigned long)params->hdr.setup_data; + + while (data && data->next) + data = (struct setup_data *)(unsigned long)data->next; + + for_each_efi_handle(h, pci_handle, size, i) { + efi_pci_io_protocol_t *pci = NULL; + struct pci_setup_rom *rom; + + status = efi_bs_call(handle_protocol, h, &pci_proto, + (void **)&pci); + if (status != EFI_SUCCESS || !pci) + continue; + + status = preserve_pci_rom_image(pci, &rom); + if (status != EFI_SUCCESS) + continue; + + if (data) + data->next = (unsigned long)rom; + else + params->hdr.setup_data = (unsigned long)rom; + + data = (struct setup_data *)rom; + } + +free_handle: + efi_bs_call(free_pool, pci_handle); +} + +static void retrieve_apple_device_properties(struct boot_params *boot_params) +{ + efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; + struct setup_data *data, *new; + efi_status_t status; + u32 size = 0; + apple_properties_protocol_t *p; + + status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); + if (status != EFI_SUCCESS) + return; + + if (efi_table_attr(p, version) != 0x10000) { + efi_err("Unsupported properties proto version\n"); + return; + } + + efi_call_proto(p, get_all, NULL, &size); + if (!size) + return; + + do { + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, + size + sizeof(struct setup_data), + (void **)&new); + if (status != EFI_SUCCESS) { + efi_err("Failed to allocate memory for 'properties'\n"); + return; + } + + status = efi_call_proto(p, get_all, new->data, &size); + + if (status == EFI_BUFFER_TOO_SMALL) + efi_bs_call(free_pool, new); + } while (status == EFI_BUFFER_TOO_SMALL); + + new->type = SETUP_APPLE_PROPERTIES; + new->len = size; + new->next = 0; + + data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; + if (!data) { + boot_params->hdr.setup_data = (unsigned long)new; + } else { + while (data->next) + data = (struct setup_data *)(unsigned long)data->next; + data->next = (unsigned long)new; + } +} + +static const efi_char16_t apple[] = L"Apple"; + +static void setup_quirks(struct boot_params *boot_params) +{ + efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long) + efi_table_attr(efi_system_table, fw_vendor); + + if (!memcmp(fw_vendor, apple, sizeof(apple))) { + if (IS_ENABLED(CONFIG_APPLE_PROPERTIES)) + retrieve_apple_device_properties(boot_params); + } +} + +/* + * See if we have Universal Graphics Adapter (UGA) protocol + */ +static efi_status_t +setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) +{ + efi_status_t status; + u32 width, height; + void **uga_handle = NULL; + efi_uga_draw_protocol_t *uga = NULL, *first_uga; + efi_handle_t handle; + int i; + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, + (void **)&uga_handle); + if (status != EFI_SUCCESS) + return status; + + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + uga_proto, NULL, &size, uga_handle); + if (status != EFI_SUCCESS) + goto free_handle; + + height = 0; + width = 0; + + first_uga = NULL; + for_each_efi_handle(handle, uga_handle, size, i) { + efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; + u32 w, h, depth, refresh; + void *pciio; + + status = efi_bs_call(handle_protocol, handle, uga_proto, + (void **)&uga); + if (status != EFI_SUCCESS) + continue; + + pciio = NULL; + efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); + + status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); + if (status == EFI_SUCCESS && (!first_uga || pciio)) { + width = w; + height = h; + + /* + * Once we've found a UGA supporting PCIIO, + * don't bother looking any further. + */ + if (pciio) + break; + + first_uga = uga; + } + } + + if (!width && !height) + goto free_handle; + + /* EFI framebuffer */ + si->orig_video_isVGA = VIDEO_TYPE_EFI; + + si->lfb_depth = 32; + si->lfb_width = width; + si->lfb_height = height; + + si->red_size = 8; + si->red_pos = 16; + si->green_size = 8; + si->green_pos = 8; + si->blue_size = 8; + si->blue_pos = 0; + si->rsvd_size = 8; + si->rsvd_pos = 24; + +free_handle: + efi_bs_call(free_pool, uga_handle); + + return status; +} + +static void setup_graphics(struct boot_params *boot_params) +{ + efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; + struct screen_info *si; + efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; + efi_status_t status; + unsigned long size; + void **gop_handle = NULL; + void **uga_handle = NULL; + + si = &boot_params->screen_info; + memset(si, 0, sizeof(*si)); + + size = 0; + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + &graphics_proto, NULL, &size, gop_handle); + if (status == EFI_BUFFER_TOO_SMALL) + status = efi_setup_gop(si, &graphics_proto, size); + + if (status != EFI_SUCCESS) { + size = 0; + status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, + &uga_proto, NULL, &size, uga_handle); + if (status == EFI_BUFFER_TOO_SMALL) + setup_uga(si, &uga_proto, size); + } +} + + +static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) +{ + efi_bs_call(exit, handle, status, 0, NULL); + for(;;) + asm("hlt"); +} + +void startup_32(struct boot_params *boot_params); + +void __noreturn efi_stub_entry(efi_handle_t handle, + efi_system_table_t *sys_table_arg, + struct boot_params *boot_params); + +/* + * Because the x86 boot code expects to be passed a boot_params we + * need to create one ourselves (usually the bootloader would create + * one for us). + */ +efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, + efi_system_table_t *sys_table_arg) +{ + struct boot_params *boot_params; + struct setup_header *hdr; + void *image_base; + efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; + int options_size = 0; + efi_status_t status; + char *cmdline_ptr; + + efi_system_table = sys_table_arg; + + /* Check if we were booted by the EFI firmware */ + if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) + efi_exit(handle, EFI_INVALID_PARAMETER); + + status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image); + if (status != EFI_SUCCESS) { + efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); + efi_exit(handle, status); + } + + image_base = efi_table_attr(image, image_base); + image_offset = (void *)startup_32 - image_base; + + status = efi_allocate_pages(sizeof(struct boot_params), + (unsigned long *)&boot_params, ULONG_MAX); + if (status != EFI_SUCCESS) { + efi_err("Failed to allocate lowmem for boot params\n"); + efi_exit(handle, status); + } + + memset(boot_params, 0x0, sizeof(struct boot_params)); + + hdr = &boot_params->hdr; + + /* Copy the setup header from the second sector to boot_params */ + memcpy(&hdr->jump, image_base + 512, + sizeof(struct setup_header) - offsetof(struct setup_header, jump)); + + /* + * Fill out some of the header fields ourselves because the + * EFI firmware loader doesn't load the first sector. + */ + hdr->root_flags = 1; + hdr->vid_mode = 0xffff; + hdr->boot_flag = 0xAA55; + + hdr->type_of_loader = 0x21; + + /* Convert unicode cmdline to ascii */ + cmdline_ptr = efi_convert_cmdline(image, &options_size); + if (!cmdline_ptr) + goto fail; + + efi_set_u64_split((unsigned long)cmdline_ptr, + &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr); + + hdr->ramdisk_image = 0; + hdr->ramdisk_size = 0; + + /* + * Disregard any setup data that was provided by the bootloader: + * setup_data could be pointing anywhere, and we have no way of + * authenticating or validating the payload. + */ + hdr->setup_data = 0; + + efi_stub_entry(handle, sys_table_arg, boot_params); + /* not reached */ + +fail: + efi_free(sizeof(struct boot_params), (unsigned long)boot_params); + + efi_exit(handle, status); +} + +static void add_e820ext(struct boot_params *params, + struct setup_data *e820ext, u32 nr_entries) +{ + struct setup_data *data; + + e820ext->type = SETUP_E820_EXT; + e820ext->len = nr_entries * sizeof(struct boot_e820_entry); + e820ext->next = 0; + + data = (struct setup_data *)(unsigned long)params->hdr.setup_data; + + while (data && data->next) + data = (struct setup_data *)(unsigned long)data->next; + + if (data) + data->next = (unsigned long)e820ext; + else + params->hdr.setup_data = (unsigned long)e820ext; +} + +static efi_status_t +setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) +{ + struct boot_e820_entry *entry = params->e820_table; + struct efi_info *efi = ¶ms->efi_info; + struct boot_e820_entry *prev = NULL; + u32 nr_entries; + u32 nr_desc; + int i; + + nr_entries = 0; + nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; + + for (i = 0; i < nr_desc; i++) { + efi_memory_desc_t *d; + unsigned int e820_type = 0; + unsigned long m = efi->efi_memmap; + +#ifdef CONFIG_X86_64 + m |= (u64)efi->efi_memmap_hi << 32; +#endif + + d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); + switch (d->type) { + case EFI_RESERVED_TYPE: + case EFI_RUNTIME_SERVICES_CODE: + case EFI_RUNTIME_SERVICES_DATA: + case EFI_MEMORY_MAPPED_IO: + case EFI_MEMORY_MAPPED_IO_PORT_SPACE: + case EFI_PAL_CODE: + e820_type = E820_TYPE_RESERVED; + break; + + case EFI_UNUSABLE_MEMORY: + e820_type = E820_TYPE_UNUSABLE; + break; + + case EFI_ACPI_RECLAIM_MEMORY: + e820_type = E820_TYPE_ACPI; + break; + + case EFI_LOADER_CODE: + case EFI_LOADER_DATA: + case EFI_BOOT_SERVICES_CODE: + case EFI_BOOT_SERVICES_DATA: + case EFI_CONVENTIONAL_MEMORY: + if (efi_soft_reserve_enabled() && + (d->attribute & EFI_MEMORY_SP)) + e820_type = E820_TYPE_SOFT_RESERVED; + else + e820_type = E820_TYPE_RAM; + break; + + case EFI_ACPI_MEMORY_NVS: + e820_type = E820_TYPE_NVS; + break; + + case EFI_PERSISTENT_MEMORY: + e820_type = E820_TYPE_PMEM; + break; + + default: + continue; + } + + /* Merge adjacent mappings */ + if (prev && prev->type == e820_type && + (prev->addr + prev->size) == d->phys_addr) { + prev->size += d->num_pages << 12; + continue; + } + + if (nr_entries == ARRAY_SIZE(params->e820_table)) { + u32 need = (nr_desc - i) * sizeof(struct e820_entry) + + sizeof(struct setup_data); + + if (!e820ext || e820ext_size < need) + return EFI_BUFFER_TOO_SMALL; + + /* boot_params map full, switch to e820 extended */ + entry = (struct boot_e820_entry *)e820ext->data; + } + + entry->addr = d->phys_addr; + entry->size = d->num_pages << PAGE_SHIFT; + entry->type = e820_type; + prev = entry++; + nr_entries++; + } + + if (nr_entries > ARRAY_SIZE(params->e820_table)) { + u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); + + add_e820ext(params, e820ext, nr_e820ext); + nr_entries -= nr_e820ext; + } + + params->e820_entries = (u8)nr_entries; + + return EFI_SUCCESS; +} + +static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, + u32 *e820ext_size) +{ + efi_status_t status; + unsigned long size; + + size = sizeof(struct setup_data) + + sizeof(struct e820_entry) * nr_desc; + + if (*e820ext) { + efi_bs_call(free_pool, *e820ext); + *e820ext = NULL; + *e820ext_size = 0; + } + + status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, + (void **)e820ext); + if (status == EFI_SUCCESS) + *e820ext_size = size; + + return status; +} + +static efi_status_t allocate_e820(struct boot_params *params, + struct setup_data **e820ext, + u32 *e820ext_size) +{ + unsigned long map_size, desc_size, map_key; + efi_status_t status; + __u32 nr_desc, desc_version; + + /* Only need the size of the mem map and size of each mem descriptor */ + map_size = 0; + status = efi_bs_call(get_memory_map, &map_size, NULL, &map_key, + &desc_size, &desc_version); + if (status != EFI_BUFFER_TOO_SMALL) + return (status != EFI_SUCCESS) ? status : EFI_UNSUPPORTED; + + nr_desc = map_size / desc_size + EFI_MMAP_NR_SLACK_SLOTS; + + if (nr_desc > ARRAY_SIZE(params->e820_table)) { + u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table); + + status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); + if (status != EFI_SUCCESS) + return status; + } + + return EFI_SUCCESS; +} + +struct exit_boot_struct { + struct boot_params *boot_params; + struct efi_info *efi; +}; + +static efi_status_t exit_boot_func(struct efi_boot_memmap *map, + void *priv) +{ + const char *signature; + struct exit_boot_struct *p = priv; + + signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE + : EFI32_LOADER_SIGNATURE; + memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); + + efi_set_u64_split((unsigned long)efi_system_table, + &p->efi->efi_systab, &p->efi->efi_systab_hi); + p->efi->efi_memdesc_size = *map->desc_size; + p->efi->efi_memdesc_version = *map->desc_ver; + efi_set_u64_split((unsigned long)*map->map, + &p->efi->efi_memmap, &p->efi->efi_memmap_hi); + p->efi->efi_memmap_size = *map->map_size; + + return EFI_SUCCESS; +} + +static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) +{ + unsigned long map_sz, key, desc_size, buff_size; + efi_memory_desc_t *mem_map; + struct setup_data *e820ext = NULL; + __u32 e820ext_size = 0; + efi_status_t status; + __u32 desc_version; + struct efi_boot_memmap map; + struct exit_boot_struct priv; + + map.map = &mem_map; + map.map_size = &map_sz; + map.desc_size = &desc_size; + map.desc_ver = &desc_version; + map.key_ptr = &key; + map.buff_size = &buff_size; + priv.boot_params = boot_params; + priv.efi = &boot_params->efi_info; + + status = allocate_e820(boot_params, &e820ext, &e820ext_size); + if (status != EFI_SUCCESS) + return status; + + /* Might as well exit boot services now */ + status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func); + if (status != EFI_SUCCESS) + return status; + + /* Historic? */ + boot_params->alt_mem_k = 32 * 1024; + + status = setup_e820(boot_params, e820ext, e820ext_size); + if (status != EFI_SUCCESS) + return status; + + return EFI_SUCCESS; +} + +/* + * On success, we return the address of startup_32, which has potentially been + * relocated by efi_relocate_kernel. + * On failure, we exit to the firmware via efi_exit instead of returning. + */ +unsigned long efi_main(efi_handle_t handle, + efi_system_table_t *sys_table_arg, + struct boot_params *boot_params) +{ + unsigned long bzimage_addr = (unsigned long)startup_32; + unsigned long buffer_start, buffer_end; + struct setup_header *hdr = &boot_params->hdr; + efi_status_t status; + + efi_system_table = sys_table_arg; + + /* Check if we were booted by the EFI firmware */ + if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) + efi_exit(handle, EFI_INVALID_PARAMETER); + + /* + * If the kernel isn't already loaded at a suitable address, + * relocate it. + * + * It must be loaded above LOAD_PHYSICAL_ADDR. + * + * The maximum address for 64-bit is 1 << 46 for 4-level paging. This + * is defined as the macro MAXMEM, but unfortunately that is not a + * compile-time constant if 5-level paging is configured, so we instead + * define our own macro for use here. + * + * For 32-bit, the maximum address is complicated to figure out, for + * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what + * KASLR uses. + * + * Also relocate it if image_offset is zero, i.e. the kernel wasn't + * loaded by LoadImage, but rather by a bootloader that called the + * handover entry. The reason we must always relocate in this case is + * to handle the case of systemd-boot booting a unified kernel image, + * which is a PE executable that contains the bzImage and an initrd as + * COFF sections. The initrd section is placed after the bzImage + * without ensuring that there are at least init_size bytes available + * for the bzImage, and thus the compressed kernel's startup code may + * overwrite the initrd unless it is moved out of the way. + */ + + buffer_start = ALIGN(bzimage_addr - image_offset, + hdr->kernel_alignment); + buffer_end = buffer_start + hdr->init_size; + + if ((buffer_start < LOAD_PHYSICAL_ADDR) || + (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) || + (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) || + (image_offset == 0)) { + status = efi_relocate_kernel(&bzimage_addr, + hdr->init_size, hdr->init_size, + hdr->pref_address, + hdr->kernel_alignment, + LOAD_PHYSICAL_ADDR); + if (status != EFI_SUCCESS) { + efi_err("efi_relocate_kernel() failed!\n"); + goto fail; + } + /* + * Now that we've copied the kernel elsewhere, we no longer + * have a set up block before startup_32(), so reset image_offset + * to zero in case it was set earlier. + */ + image_offset = 0; + } + +#ifdef CONFIG_CMDLINE_BOOL + status = efi_parse_options(CONFIG_CMDLINE); + if (status != EFI_SUCCESS) { + efi_err("Failed to parse options\n"); + goto fail; + } +#endif + if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { + unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr | + ((u64)boot_params->ext_cmd_line_ptr << 32)); + status = efi_parse_options((char *)cmdline_paddr); + if (status != EFI_SUCCESS) { + efi_err("Failed to parse options\n"); + goto fail; + } + } + + /* + * At this point, an initrd may already have been loaded by the + * bootloader and passed via bootparams. We permit an initrd loaded + * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. + * + * If the device path is not present, any command-line initrd= + * arguments will be processed only if image is not NULL, which will be + * the case only if we were loaded via the PE entry point. + */ + if (!efi_noinitrd) { + unsigned long addr, size; + + status = efi_load_initrd(image, &addr, &size, + hdr->initrd_addr_max, ULONG_MAX); + + if (status != EFI_SUCCESS) { + efi_err("Failed to load initrd!\n"); + goto fail; + } + if (size > 0) { + efi_set_u64_split(addr, &hdr->ramdisk_image, + &boot_params->ext_ramdisk_image); + efi_set_u64_split(size, &hdr->ramdisk_size, + &boot_params->ext_ramdisk_size); + } + } + + /* + * If the boot loader gave us a value for secure_boot then we use that, + * otherwise we ask the BIOS. + */ + if (boot_params->secure_boot == efi_secureboot_mode_unset) + boot_params->secure_boot = efi_get_secureboot(); + + /* Ask the firmware to clear memory on unclean shutdown */ + efi_enable_reset_attack_mitigation(); + + efi_random_get_seed(); + + efi_retrieve_tpm2_eventlog(); + + setup_graphics(boot_params); + + setup_efi_pci(boot_params); + + setup_quirks(boot_params); + + status = exit_boot(boot_params, handle); + if (status != EFI_SUCCESS) { + efi_err("exit_boot() failed!\n"); + goto fail; + } + + return bzimage_addr; +fail: + efi_err("efi_main() failed!\n"); + + efi_exit(handle, status); +} diff --git a/drivers/firmware/efi/memattr.c b/drivers/firmware/efi/memattr.c new file mode 100644 index 000000000..f178b2984 --- /dev/null +++ b/drivers/firmware/efi/memattr.c @@ -0,0 +1,179 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2016 Linaro Ltd. <ard.biesheuvel@linaro.org> + */ + +#define pr_fmt(fmt) "efi: memattr: " fmt + +#include <linux/efi.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/memblock.h> + +#include <asm/early_ioremap.h> + +static int __initdata tbl_size; +unsigned long __ro_after_init efi_mem_attr_table = EFI_INVALID_TABLE_ADDR; + +/* + * Reserve the memory associated with the Memory Attributes configuration + * table, if it exists. + */ +int __init efi_memattr_init(void) +{ + efi_memory_attributes_table_t *tbl; + + if (efi_mem_attr_table == EFI_INVALID_TABLE_ADDR) + return 0; + + tbl = early_memremap(efi_mem_attr_table, sizeof(*tbl)); + if (!tbl) { + pr_err("Failed to map EFI Memory Attributes table @ 0x%lx\n", + efi_mem_attr_table); + return -ENOMEM; + } + + if (tbl->version > 2) { + pr_warn("Unexpected EFI Memory Attributes table version %d\n", + tbl->version); + goto unmap; + } + + tbl_size = sizeof(*tbl) + tbl->num_entries * tbl->desc_size; + memblock_reserve(efi_mem_attr_table, tbl_size); + set_bit(EFI_MEM_ATTR, &efi.flags); + +unmap: + early_memunmap(tbl, sizeof(*tbl)); + return 0; +} + +/* + * Returns a copy @out of the UEFI memory descriptor @in if it is covered + * entirely by a UEFI memory map entry with matching attributes. The virtual + * address of @out is set according to the matching entry that was found. + */ +static bool entry_is_valid(const efi_memory_desc_t *in, efi_memory_desc_t *out) +{ + u64 in_paddr = in->phys_addr; + u64 in_size = in->num_pages << EFI_PAGE_SHIFT; + efi_memory_desc_t *md; + + *out = *in; + + if (in->type != EFI_RUNTIME_SERVICES_CODE && + in->type != EFI_RUNTIME_SERVICES_DATA) { + pr_warn("Entry type should be RuntimeServiceCode/Data\n"); + return false; + } + + if (PAGE_SIZE > EFI_PAGE_SIZE && + (!PAGE_ALIGNED(in->phys_addr) || + !PAGE_ALIGNED(in->num_pages << EFI_PAGE_SHIFT))) { + /* + * Since arm64 may execute with page sizes of up to 64 KB, the + * UEFI spec mandates that RuntimeServices memory regions must + * be 64 KB aligned. We need to validate this here since we will + * not be able to tighten permissions on such regions without + * affecting adjacent regions. + */ + pr_warn("Entry address region misaligned\n"); + return false; + } + + for_each_efi_memory_desc(md) { + u64 md_paddr = md->phys_addr; + u64 md_size = md->num_pages << EFI_PAGE_SHIFT; + + if (!(md->attribute & EFI_MEMORY_RUNTIME)) + continue; + if (md->virt_addr == 0 && md->phys_addr != 0) { + /* no virtual mapping has been installed by the stub */ + break; + } + + if (md_paddr > in_paddr || (in_paddr - md_paddr) >= md_size) + continue; + + /* + * This entry covers the start of @in, check whether + * it covers the end as well. + */ + if (md_paddr + md_size < in_paddr + in_size) { + pr_warn("Entry covers multiple EFI memory map regions\n"); + return false; + } + + if (md->type != in->type) { + pr_warn("Entry type deviates from EFI memory map region type\n"); + return false; + } + + out->virt_addr = in_paddr + (md->virt_addr - md_paddr); + + return true; + } + + pr_warn("No matching entry found in the EFI memory map\n"); + return false; +} + +/* + * To be called after the EFI page tables have been populated. If a memory + * attributes table is available, its contents will be used to update the + * mappings with tightened permissions as described by the table. + * This requires the UEFI memory map to have already been populated with + * virtual addresses. + */ +int __init efi_memattr_apply_permissions(struct mm_struct *mm, + efi_memattr_perm_setter fn) +{ + efi_memory_attributes_table_t *tbl; + int i, ret; + + if (tbl_size <= sizeof(*tbl)) + return 0; + + /* + * We need the EFI memory map to be setup so we can use it to + * lookup the virtual addresses of all entries in the of EFI + * Memory Attributes table. If it isn't available, this + * function should not be called. + */ + if (WARN_ON(!efi_enabled(EFI_MEMMAP))) + return 0; + + tbl = memremap(efi_mem_attr_table, tbl_size, MEMREMAP_WB); + if (!tbl) { + pr_err("Failed to map EFI Memory Attributes table @ 0x%lx\n", + efi_mem_attr_table); + return -ENOMEM; + } + + if (efi_enabled(EFI_DBG)) + pr_info("Processing EFI Memory Attributes table:\n"); + + for (i = ret = 0; ret == 0 && i < tbl->num_entries; i++) { + efi_memory_desc_t md; + unsigned long size; + bool valid; + char buf[64]; + + valid = entry_is_valid((void *)tbl->entry + i * tbl->desc_size, + &md); + size = md.num_pages << EFI_PAGE_SHIFT; + if (efi_enabled(EFI_DBG) || !valid) + pr_info("%s 0x%012llx-0x%012llx %s\n", + valid ? "" : "!", md.phys_addr, + md.phys_addr + size - 1, + efi_md_typeattr_format(buf, sizeof(buf), &md)); + + if (valid) { + ret = fn(mm, &md); + if (ret) + pr_err("Error updating mappings, skipping subsequent md's\n"); + } + } + memunmap(tbl); + return ret; +} diff --git a/drivers/firmware/efi/memmap.c b/drivers/firmware/efi/memmap.c new file mode 100644 index 000000000..2ff1883dc --- /dev/null +++ b/drivers/firmware/efi/memmap.c @@ -0,0 +1,378 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Common EFI memory map functions. + */ + +#define pr_fmt(fmt) "efi: " fmt + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/efi.h> +#include <linux/io.h> +#include <asm/early_ioremap.h> +#include <linux/memblock.h> +#include <linux/slab.h> + +static phys_addr_t __init __efi_memmap_alloc_early(unsigned long size) +{ + return memblock_phys_alloc(size, SMP_CACHE_BYTES); +} + +static phys_addr_t __init __efi_memmap_alloc_late(unsigned long size) +{ + unsigned int order = get_order(size); + struct page *p = alloc_pages(GFP_KERNEL, order); + + if (!p) + return 0; + + return PFN_PHYS(page_to_pfn(p)); +} + +void __init __efi_memmap_free(u64 phys, unsigned long size, unsigned long flags) +{ + if (flags & EFI_MEMMAP_MEMBLOCK) { + if (slab_is_available()) + memblock_free_late(phys, size); + else + memblock_free(phys, size); + } else if (flags & EFI_MEMMAP_SLAB) { + struct page *p = pfn_to_page(PHYS_PFN(phys)); + unsigned int order = get_order(size); + + free_pages((unsigned long) page_address(p), order); + } +} + +static void __init efi_memmap_free(void) +{ + __efi_memmap_free(efi.memmap.phys_map, + efi.memmap.desc_size * efi.memmap.nr_map, + efi.memmap.flags); +} + +/** + * efi_memmap_alloc - Allocate memory for the EFI memory map + * @num_entries: Number of entries in the allocated map. + * @data: efi memmap installation parameters + * + * Depending on whether mm_init() has already been invoked or not, + * either memblock or "normal" page allocation is used. + * + * Returns the physical address of the allocated memory map on + * success, zero on failure. + */ +int __init efi_memmap_alloc(unsigned int num_entries, + struct efi_memory_map_data *data) +{ + /* Expect allocation parameters are zero initialized */ + WARN_ON(data->phys_map || data->size); + + data->size = num_entries * efi.memmap.desc_size; + data->desc_version = efi.memmap.desc_version; + data->desc_size = efi.memmap.desc_size; + data->flags &= ~(EFI_MEMMAP_SLAB | EFI_MEMMAP_MEMBLOCK); + data->flags |= efi.memmap.flags & EFI_MEMMAP_LATE; + + if (slab_is_available()) { + data->flags |= EFI_MEMMAP_SLAB; + data->phys_map = __efi_memmap_alloc_late(data->size); + } else { + data->flags |= EFI_MEMMAP_MEMBLOCK; + data->phys_map = __efi_memmap_alloc_early(data->size); + } + + if (!data->phys_map) + return -ENOMEM; + return 0; +} + +/** + * __efi_memmap_init - Common code for mapping the EFI memory map + * @data: EFI memory map data + * + * This function takes care of figuring out which function to use to + * map the EFI memory map in efi.memmap based on how far into the boot + * we are. + * + * During bootup EFI_MEMMAP_LATE in data->flags should be clear since we + * only have access to the early_memremap*() functions as the vmalloc + * space isn't setup. Once the kernel is fully booted we can fallback + * to the more robust memremap*() API. + * + * Returns zero on success, a negative error code on failure. + */ +static int __init __efi_memmap_init(struct efi_memory_map_data *data) +{ + struct efi_memory_map map; + phys_addr_t phys_map; + + if (efi_enabled(EFI_PARAVIRT)) + return 0; + + phys_map = data->phys_map; + + if (data->flags & EFI_MEMMAP_LATE) + map.map = memremap(phys_map, data->size, MEMREMAP_WB); + else + map.map = early_memremap(phys_map, data->size); + + if (!map.map) { + pr_err("Could not map the memory map!\n"); + return -ENOMEM; + } + + /* NOP if data->flags & (EFI_MEMMAP_MEMBLOCK | EFI_MEMMAP_SLAB) == 0 */ + efi_memmap_free(); + + map.phys_map = data->phys_map; + map.nr_map = data->size / data->desc_size; + map.map_end = map.map + data->size; + + map.desc_version = data->desc_version; + map.desc_size = data->desc_size; + map.flags = data->flags; + + set_bit(EFI_MEMMAP, &efi.flags); + + efi.memmap = map; + + return 0; +} + +/** + * efi_memmap_init_early - Map the EFI memory map data structure + * @data: EFI memory map data + * + * Use early_memremap() to map the passed in EFI memory map and assign + * it to efi.memmap. + */ +int __init efi_memmap_init_early(struct efi_memory_map_data *data) +{ + /* Cannot go backwards */ + WARN_ON(efi.memmap.flags & EFI_MEMMAP_LATE); + + data->flags = 0; + return __efi_memmap_init(data); +} + +void __init efi_memmap_unmap(void) +{ + if (!efi_enabled(EFI_MEMMAP)) + return; + + if (!(efi.memmap.flags & EFI_MEMMAP_LATE)) { + unsigned long size; + + size = efi.memmap.desc_size * efi.memmap.nr_map; + early_memunmap(efi.memmap.map, size); + } else { + memunmap(efi.memmap.map); + } + + efi.memmap.map = NULL; + clear_bit(EFI_MEMMAP, &efi.flags); +} + +/** + * efi_memmap_init_late - Map efi.memmap with memremap() + * @phys_addr: Physical address of the new EFI memory map + * @size: Size in bytes of the new EFI memory map + * + * Setup a mapping of the EFI memory map using ioremap_cache(). This + * function should only be called once the vmalloc space has been + * setup and is therefore not suitable for calling during early EFI + * initialise, e.g. in efi_init(). Additionally, it expects + * efi_memmap_init_early() to have already been called. + * + * The reason there are two EFI memmap initialisation + * (efi_memmap_init_early() and this late version) is because the + * early EFI memmap should be explicitly unmapped once EFI + * initialisation is complete as the fixmap space used to map the EFI + * memmap (via early_memremap()) is a scarce resource. + * + * This late mapping is intended to persist for the duration of + * runtime so that things like efi_mem_desc_lookup() and + * efi_mem_attributes() always work. + * + * Returns zero on success, a negative error code on failure. + */ +int __init efi_memmap_init_late(phys_addr_t addr, unsigned long size) +{ + struct efi_memory_map_data data = { + .phys_map = addr, + .size = size, + .flags = EFI_MEMMAP_LATE, + }; + + /* Did we forget to unmap the early EFI memmap? */ + WARN_ON(efi.memmap.map); + + /* Were we already called? */ + WARN_ON(efi.memmap.flags & EFI_MEMMAP_LATE); + + /* + * It makes no sense to allow callers to register different + * values for the following fields. Copy them out of the + * existing early EFI memmap. + */ + data.desc_version = efi.memmap.desc_version; + data.desc_size = efi.memmap.desc_size; + + return __efi_memmap_init(&data); +} + +/** + * efi_memmap_install - Install a new EFI memory map in efi.memmap + * @ctx: map allocation parameters (address, size, flags) + * + * Unlike efi_memmap_init_*(), this function does not allow the caller + * to switch from early to late mappings. It simply uses the existing + * mapping function and installs the new memmap. + * + * Returns zero on success, a negative error code on failure. + */ +int __init efi_memmap_install(struct efi_memory_map_data *data) +{ + efi_memmap_unmap(); + + return __efi_memmap_init(data); +} + +/** + * efi_memmap_split_count - Count number of additional EFI memmap entries + * @md: EFI memory descriptor to split + * @range: Address range (start, end) to split around + * + * Returns the number of additional EFI memmap entries required to + * accomodate @range. + */ +int __init efi_memmap_split_count(efi_memory_desc_t *md, struct range *range) +{ + u64 m_start, m_end; + u64 start, end; + int count = 0; + + start = md->phys_addr; + end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1; + + /* modifying range */ + m_start = range->start; + m_end = range->end; + + if (m_start <= start) { + /* split into 2 parts */ + if (start < m_end && m_end < end) + count++; + } + + if (start < m_start && m_start < end) { + /* split into 3 parts */ + if (m_end < end) + count += 2; + /* split into 2 parts */ + if (end <= m_end) + count++; + } + + return count; +} + +/** + * efi_memmap_insert - Insert a memory region in an EFI memmap + * @old_memmap: The existing EFI memory map structure + * @buf: Address of buffer to store new map + * @mem: Memory map entry to insert + * + * It is suggested that you call efi_memmap_split_count() first + * to see how large @buf needs to be. + */ +void __init efi_memmap_insert(struct efi_memory_map *old_memmap, void *buf, + struct efi_mem_range *mem) +{ + u64 m_start, m_end, m_attr; + efi_memory_desc_t *md; + u64 start, end; + void *old, *new; + + /* modifying range */ + m_start = mem->range.start; + m_end = mem->range.end; + m_attr = mem->attribute; + + /* + * The EFI memory map deals with regions in EFI_PAGE_SIZE + * units. Ensure that the region described by 'mem' is aligned + * correctly. + */ + if (!IS_ALIGNED(m_start, EFI_PAGE_SIZE) || + !IS_ALIGNED(m_end + 1, EFI_PAGE_SIZE)) { + WARN_ON(1); + return; + } + + for (old = old_memmap->map, new = buf; + old < old_memmap->map_end; + old += old_memmap->desc_size, new += old_memmap->desc_size) { + + /* copy original EFI memory descriptor */ + memcpy(new, old, old_memmap->desc_size); + md = new; + start = md->phys_addr; + end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1; + + if (m_start <= start && end <= m_end) + md->attribute |= m_attr; + + if (m_start <= start && + (start < m_end && m_end < end)) { + /* first part */ + md->attribute |= m_attr; + md->num_pages = (m_end - md->phys_addr + 1) >> + EFI_PAGE_SHIFT; + /* latter part */ + new += old_memmap->desc_size; + memcpy(new, old, old_memmap->desc_size); + md = new; + md->phys_addr = m_end + 1; + md->num_pages = (end - md->phys_addr + 1) >> + EFI_PAGE_SHIFT; + } + + if ((start < m_start && m_start < end) && m_end < end) { + /* first part */ + md->num_pages = (m_start - md->phys_addr) >> + EFI_PAGE_SHIFT; + /* middle part */ + new += old_memmap->desc_size; + memcpy(new, old, old_memmap->desc_size); + md = new; + md->attribute |= m_attr; + md->phys_addr = m_start; + md->num_pages = (m_end - m_start + 1) >> + EFI_PAGE_SHIFT; + /* last part */ + new += old_memmap->desc_size; + memcpy(new, old, old_memmap->desc_size); + md = new; + md->phys_addr = m_end + 1; + md->num_pages = (end - m_end) >> + EFI_PAGE_SHIFT; + } + + if ((start < m_start && m_start < end) && + (end <= m_end)) { + /* first part */ + md->num_pages = (m_start - md->phys_addr) >> + EFI_PAGE_SHIFT; + /* latter part */ + new += old_memmap->desc_size; + memcpy(new, old, old_memmap->desc_size); + md = new; + md->phys_addr = m_start; + md->num_pages = (end - md->phys_addr + 1) >> + EFI_PAGE_SHIFT; + md->attribute |= m_attr; + } + } +} diff --git a/drivers/firmware/efi/mokvar-table.c b/drivers/firmware/efi/mokvar-table.c new file mode 100644 index 000000000..38722d200 --- /dev/null +++ b/drivers/firmware/efi/mokvar-table.c @@ -0,0 +1,362 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * mokvar-table.c + * + * Copyright (c) 2020 Red Hat + * Author: Lenny Szubowicz <lszubowi@redhat.com> + * + * This module contains the kernel support for the Linux EFI Machine + * Owner Key (MOK) variable configuration table, which is identified by + * the LINUX_EFI_MOK_VARIABLE_TABLE_GUID. + * + * This EFI configuration table provides a more robust alternative to + * EFI volatile variables by which an EFI boot loader can pass the + * contents of the Machine Owner Key (MOK) certificate stores to the + * kernel during boot. If both the EFI MOK config table and corresponding + * EFI MOK variables are present, the table should be considered as + * more authoritative. + * + * This module includes code that validates and maps the EFI MOK table, + * if it's presence was detected very early in boot. + * + * Kernel interface routines are provided to walk through all the + * entries in the MOK config table or to search for a specific named + * entry. + * + * The contents of the individual named MOK config table entries are + * made available to user space via read-only sysfs binary files under: + * + * /sys/firmware/efi/mok-variables/ + * + */ +#define pr_fmt(fmt) "mokvar: " fmt + +#include <linux/capability.h> +#include <linux/efi.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/kobject.h> +#include <linux/list.h> +#include <linux/slab.h> + +#include <asm/early_ioremap.h> + +/* + * The LINUX_EFI_MOK_VARIABLE_TABLE_GUID config table is a packed + * sequence of struct efi_mokvar_table_entry, one for each named + * MOK variable. The sequence is terminated by an entry with a + * completely NULL name and 0 data size. + * + * efi_mokvar_table_size is set to the computed size of the + * MOK config table by efi_mokvar_table_init(). This will be + * non-zero if and only if the table if present and has been + * validated by efi_mokvar_table_init(). + */ +static size_t efi_mokvar_table_size; + +/* + * efi_mokvar_table_va is the kernel virtual address at which the + * EFI MOK config table has been mapped by efi_mokvar_sysfs_init(). + */ +static struct efi_mokvar_table_entry *efi_mokvar_table_va; + +/* + * Each /sys/firmware/efi/mok-variables/ sysfs file is represented by + * an instance of struct efi_mokvar_sysfs_attr on efi_mokvar_sysfs_list. + * bin_attr.private points to the associated EFI MOK config table entry. + * + * This list is created during boot and then remains unchanged. + * So no synchronization is currently required to walk the list. + */ +struct efi_mokvar_sysfs_attr { + struct bin_attribute bin_attr; + struct list_head node; +}; + +static LIST_HEAD(efi_mokvar_sysfs_list); +static struct kobject *mokvar_kobj; + +/* + * efi_mokvar_table_init() - Early boot validation of EFI MOK config table + * + * If present, validate and compute the size of the EFI MOK variable + * configuration table. This table may be provided by an EFI boot loader + * as an alternative to ordinary EFI variables, due to platform-dependent + * limitations. The memory occupied by this table is marked as reserved. + * + * This routine must be called before efi_free_boot_services() in order + * to guarantee that it can mark the table as reserved. + * + * Implicit inputs: + * efi.mokvar_table: Physical address of EFI MOK variable config table + * or special value that indicates no such table. + * + * Implicit outputs: + * efi_mokvar_table_size: Computed size of EFI MOK variable config table. + * The table is considered present and valid if this + * is non-zero. + */ +void __init efi_mokvar_table_init(void) +{ + efi_memory_desc_t md; + void *va = NULL; + unsigned long cur_offset = 0; + unsigned long offset_limit; + unsigned long map_size = 0; + unsigned long map_size_needed = 0; + unsigned long size; + struct efi_mokvar_table_entry *mokvar_entry; + int err; + + if (!efi_enabled(EFI_MEMMAP)) + return; + + if (efi.mokvar_table == EFI_INVALID_TABLE_ADDR) + return; + /* + * The EFI MOK config table must fit within a single EFI memory + * descriptor range. + */ + err = efi_mem_desc_lookup(efi.mokvar_table, &md); + if (err) { + pr_warn("EFI MOKvar config table is not within the EFI memory map\n"); + return; + } + + offset_limit = efi_mem_desc_end(&md) - efi.mokvar_table; + + /* + * Validate the MOK config table. Since there is no table header + * from which we could get the total size of the MOK config table, + * we compute the total size as we validate each variably sized + * entry, remapping as necessary. + */ + err = -EINVAL; + while (cur_offset + sizeof(*mokvar_entry) <= offset_limit) { + mokvar_entry = va + cur_offset; + map_size_needed = cur_offset + sizeof(*mokvar_entry); + if (map_size_needed > map_size) { + if (va) + early_memunmap(va, map_size); + /* + * Map a little more than the fixed size entry + * header, anticipating some data. It's safe to + * do so as long as we stay within current memory + * descriptor. + */ + map_size = min(map_size_needed + 2*EFI_PAGE_SIZE, + offset_limit); + va = early_memremap(efi.mokvar_table, map_size); + if (!va) { + pr_err("Failed to map EFI MOKvar config table pa=0x%lx, size=%lu.\n", + efi.mokvar_table, map_size); + return; + } + mokvar_entry = va + cur_offset; + } + + /* Check for last sentinel entry */ + if (mokvar_entry->name[0] == '\0') { + if (mokvar_entry->data_size != 0) + break; + err = 0; + break; + } + + /* Sanity check that the name is null terminated */ + size = strnlen(mokvar_entry->name, + sizeof(mokvar_entry->name)); + if (size >= sizeof(mokvar_entry->name)) + break; + + /* Advance to the next entry */ + cur_offset = map_size_needed + mokvar_entry->data_size; + } + + if (va) + early_memunmap(va, map_size); + if (err) { + pr_err("EFI MOKvar config table is not valid\n"); + return; + } + + if (md.type == EFI_BOOT_SERVICES_DATA) + efi_mem_reserve(efi.mokvar_table, map_size_needed); + + efi_mokvar_table_size = map_size_needed; +} + +/* + * efi_mokvar_entry_next() - Get next entry in the EFI MOK config table + * + * mokvar_entry: Pointer to current EFI MOK config table entry + * or null. Null indicates get first entry. + * Passed by reference. This is updated to the + * same value as the return value. + * + * Returns: Pointer to next EFI MOK config table entry + * or null, if there are no more entries. + * Same value is returned in the mokvar_entry + * parameter. + * + * This routine depends on the EFI MOK config table being entirely + * mapped with it's starting virtual address in efi_mokvar_table_va. + */ +struct efi_mokvar_table_entry *efi_mokvar_entry_next( + struct efi_mokvar_table_entry **mokvar_entry) +{ + struct efi_mokvar_table_entry *mokvar_cur; + struct efi_mokvar_table_entry *mokvar_next; + size_t size_cur; + + mokvar_cur = *mokvar_entry; + *mokvar_entry = NULL; + + if (efi_mokvar_table_va == NULL) + return NULL; + + if (mokvar_cur == NULL) { + mokvar_next = efi_mokvar_table_va; + } else { + if (mokvar_cur->name[0] == '\0') + return NULL; + size_cur = sizeof(*mokvar_cur) + mokvar_cur->data_size; + mokvar_next = (void *)mokvar_cur + size_cur; + } + + if (mokvar_next->name[0] == '\0') + return NULL; + + *mokvar_entry = mokvar_next; + return mokvar_next; +} + +/* + * efi_mokvar_entry_find() - Find EFI MOK config entry by name + * + * name: Name of the entry to look for. + * + * Returns: Pointer to EFI MOK config table entry if found; + * null otherwise. + * + * This routine depends on the EFI MOK config table being entirely + * mapped with it's starting virtual address in efi_mokvar_table_va. + */ +struct efi_mokvar_table_entry *efi_mokvar_entry_find(const char *name) +{ + struct efi_mokvar_table_entry *mokvar_entry = NULL; + + while (efi_mokvar_entry_next(&mokvar_entry)) { + if (!strncmp(name, mokvar_entry->name, + sizeof(mokvar_entry->name))) + return mokvar_entry; + } + return NULL; +} + +/* + * efi_mokvar_sysfs_read() - sysfs binary file read routine + * + * Returns: Count of bytes read. + * + * Copy EFI MOK config table entry data for this mokvar sysfs binary file + * to the supplied buffer, starting at the specified offset into mokvar table + * entry data, for the specified count bytes. The copy is limited by the + * amount of data in this mokvar config table entry. + */ +static ssize_t efi_mokvar_sysfs_read(struct file *file, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct efi_mokvar_table_entry *mokvar_entry = bin_attr->private; + + if (!capable(CAP_SYS_ADMIN)) + return 0; + + if (off >= mokvar_entry->data_size) + return 0; + if (count > mokvar_entry->data_size - off) + count = mokvar_entry->data_size - off; + + memcpy(buf, mokvar_entry->data + off, count); + return count; +} + +/* + * efi_mokvar_sysfs_init() - Map EFI MOK config table and create sysfs + * + * Map the EFI MOK variable config table for run-time use by the kernel + * and create the sysfs entries in /sys/firmware/efi/mok-variables/ + * + * This routine just returns if a valid EFI MOK variable config table + * was not found earlier during boot. + * + * This routine must be called during a "middle" initcall phase, i.e. + * after efi_mokvar_table_init() but before UEFI certs are loaded + * during late init. + * + * Implicit inputs: + * efi.mokvar_table: Physical address of EFI MOK variable config table + * or special value that indicates no such table. + * + * efi_mokvar_table_size: Computed size of EFI MOK variable config table. + * The table is considered present and valid if this + * is non-zero. + * + * Implicit outputs: + * efi_mokvar_table_va: Start virtual address of the EFI MOK config table. + */ +static int __init efi_mokvar_sysfs_init(void) +{ + void *config_va; + struct efi_mokvar_table_entry *mokvar_entry = NULL; + struct efi_mokvar_sysfs_attr *mokvar_sysfs = NULL; + int err = 0; + + if (efi_mokvar_table_size == 0) + return -ENOENT; + + config_va = memremap(efi.mokvar_table, efi_mokvar_table_size, + MEMREMAP_WB); + if (!config_va) { + pr_err("Failed to map EFI MOKvar config table\n"); + return -ENOMEM; + } + efi_mokvar_table_va = config_va; + + mokvar_kobj = kobject_create_and_add("mok-variables", efi_kobj); + if (!mokvar_kobj) { + pr_err("Failed to create EFI mok-variables sysfs entry\n"); + return -ENOMEM; + } + + while (efi_mokvar_entry_next(&mokvar_entry)) { + mokvar_sysfs = kzalloc(sizeof(*mokvar_sysfs), GFP_KERNEL); + if (!mokvar_sysfs) { + err = -ENOMEM; + break; + } + + sysfs_bin_attr_init(&mokvar_sysfs->bin_attr); + mokvar_sysfs->bin_attr.private = mokvar_entry; + mokvar_sysfs->bin_attr.attr.name = mokvar_entry->name; + mokvar_sysfs->bin_attr.attr.mode = 0400; + mokvar_sysfs->bin_attr.size = mokvar_entry->data_size; + mokvar_sysfs->bin_attr.read = efi_mokvar_sysfs_read; + + err = sysfs_create_bin_file(mokvar_kobj, + &mokvar_sysfs->bin_attr); + if (err) + break; + + list_add_tail(&mokvar_sysfs->node, &efi_mokvar_sysfs_list); + } + + if (err) { + pr_err("Failed to create some EFI mok-variables sysfs entries\n"); + kfree(mokvar_sysfs); + } + return err; +} +device_initcall(efi_mokvar_sysfs_init); diff --git a/drivers/firmware/efi/rci2-table.c b/drivers/firmware/efi/rci2-table.c new file mode 100644 index 000000000..de1a9a1f9 --- /dev/null +++ b/drivers/firmware/efi/rci2-table.c @@ -0,0 +1,150 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Export Runtime Configuration Interface Table Version 2 (RCI2) + * to sysfs + * + * Copyright (C) 2019 Dell Inc + * by Narendra K <Narendra.K@dell.com> + * + * System firmware advertises the address of the RCI2 Table via + * an EFI Configuration Table entry. This code retrieves the RCI2 + * table from the address and exports it to sysfs as a binary + * attribute 'rci2' under /sys/firmware/efi/tables directory. + */ + +#include <linux/kobject.h> +#include <linux/device.h> +#include <linux/sysfs.h> +#include <linux/efi.h> +#include <linux/types.h> +#include <linux/io.h> + +#define RCI_SIGNATURE "_RC_" + +struct rci2_table_global_hdr { + u16 type; + u16 resvd0; + u16 hdr_len; + u8 rci2_sig[4]; + u16 resvd1; + u32 resvd2; + u32 resvd3; + u8 major_rev; + u8 minor_rev; + u16 num_of_structs; + u32 rci2_len; + u16 rci2_chksum; +} __packed; + +static u8 *rci2_base; +static u32 rci2_table_len; +unsigned long rci2_table_phys __ro_after_init = EFI_INVALID_TABLE_ADDR; + +static ssize_t raw_table_read(struct file *file, struct kobject *kobj, + struct bin_attribute *attr, char *buf, + loff_t pos, size_t count) +{ + memcpy(buf, attr->private + pos, count); + return count; +} + +static BIN_ATTR(rci2, S_IRUSR, raw_table_read, NULL, 0); + +static u16 checksum(void) +{ + u8 len_is_odd = rci2_table_len % 2; + u32 chksum_len = rci2_table_len; + u16 *base = (u16 *)rci2_base; + u8 buf[2] = {0}; + u32 offset = 0; + u16 chksum = 0; + + if (len_is_odd) + chksum_len -= 1; + + while (offset < chksum_len) { + chksum += *base; + offset += 2; + base++; + } + + if (len_is_odd) { + buf[0] = *(u8 *)base; + chksum += *(u16 *)(buf); + } + + return chksum; +} + +static int __init efi_rci2_sysfs_init(void) +{ + struct kobject *tables_kobj; + int ret = -ENOMEM; + + if (rci2_table_phys == EFI_INVALID_TABLE_ADDR) + return 0; + + rci2_base = memremap(rci2_table_phys, + sizeof(struct rci2_table_global_hdr), + MEMREMAP_WB); + if (!rci2_base) { + pr_debug("RCI2 table init failed - could not map RCI2 table\n"); + goto err; + } + + if (strncmp(rci2_base + + offsetof(struct rci2_table_global_hdr, rci2_sig), + RCI_SIGNATURE, 4)) { + pr_debug("RCI2 table init failed - incorrect signature\n"); + ret = -ENODEV; + goto err_unmap; + } + + rci2_table_len = *(u32 *)(rci2_base + + offsetof(struct rci2_table_global_hdr, + rci2_len)); + + memunmap(rci2_base); + + if (!rci2_table_len) { + pr_debug("RCI2 table init failed - incorrect table length\n"); + goto err; + } + + rci2_base = memremap(rci2_table_phys, rci2_table_len, MEMREMAP_WB); + if (!rci2_base) { + pr_debug("RCI2 table - could not map RCI2 table\n"); + goto err; + } + + if (checksum() != 0) { + pr_debug("RCI2 table - incorrect checksum\n"); + ret = -ENODEV; + goto err_unmap; + } + + tables_kobj = kobject_create_and_add("tables", efi_kobj); + if (!tables_kobj) { + pr_debug("RCI2 table - tables_kobj creation failed\n"); + goto err_unmap; + } + + bin_attr_rci2.size = rci2_table_len; + bin_attr_rci2.private = rci2_base; + ret = sysfs_create_bin_file(tables_kobj, &bin_attr_rci2); + if (ret != 0) { + pr_debug("RCI2 table - rci2 sysfs bin file creation failed\n"); + kobject_del(tables_kobj); + kobject_put(tables_kobj); + goto err_unmap; + } + + return 0; + + err_unmap: + memunmap(rci2_base); + err: + pr_debug("RCI2 table - sysfs initialization failed\n"); + return ret; +} +late_initcall(efi_rci2_sysfs_init); diff --git a/drivers/firmware/efi/reboot.c b/drivers/firmware/efi/reboot.c new file mode 100644 index 000000000..73089a24f --- /dev/null +++ b/drivers/firmware/efi/reboot.c @@ -0,0 +1,77 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2014 Intel Corporation; author Matt Fleming + * Copyright (c) 2014 Red Hat, Inc., Mark Salter <msalter@redhat.com> + */ +#include <linux/efi.h> +#include <linux/reboot.h> + +static void (*orig_pm_power_off)(void); + +int efi_reboot_quirk_mode = -1; + +void efi_reboot(enum reboot_mode reboot_mode, const char *__unused) +{ + const char *str[] = { "cold", "warm", "shutdown", "platform" }; + int efi_mode, cap_reset_mode; + + if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM)) + return; + + switch (reboot_mode) { + case REBOOT_WARM: + case REBOOT_SOFT: + efi_mode = EFI_RESET_WARM; + break; + default: + efi_mode = EFI_RESET_COLD; + break; + } + + /* + * If a quirk forced an EFI reset mode, always use that. + */ + if (efi_reboot_quirk_mode != -1) + efi_mode = efi_reboot_quirk_mode; + + if (efi_capsule_pending(&cap_reset_mode)) { + if (efi_mode != cap_reset_mode) + printk(KERN_CRIT "efi: %s reset requested but pending " + "capsule update requires %s reset... Performing " + "%s reset.\n", str[efi_mode], str[cap_reset_mode], + str[cap_reset_mode]); + efi_mode = cap_reset_mode; + } + + efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL); +} + +bool __weak efi_poweroff_required(void) +{ + return false; +} + +static void efi_power_off(void) +{ + efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL); + /* + * The above call should not return, if it does fall back to + * the original power off method (typically ACPI poweroff). + */ + if (orig_pm_power_off) + orig_pm_power_off(); +} + +static int __init efi_shutdown_init(void) +{ + if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM)) + return -ENODEV; + + if (efi_poweroff_required()) { + orig_pm_power_off = pm_power_off; + pm_power_off = efi_power_off; + } + + return 0; +} +late_initcall(efi_shutdown_init); diff --git a/drivers/firmware/efi/riscv-runtime.c b/drivers/firmware/efi/riscv-runtime.c new file mode 100644 index 000000000..d28e715d2 --- /dev/null +++ b/drivers/firmware/efi/riscv-runtime.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Extensible Firmware Interface + * + * Copyright (C) 2020 Western Digital Corporation or its affiliates. + * + * Based on Extensible Firmware Interface Specification version 2.4 + * Adapted from drivers/firmware/efi/arm-runtime.c + * + */ + +#include <linux/dmi.h> +#include <linux/efi.h> +#include <linux/io.h> +#include <linux/memblock.h> +#include <linux/mm_types.h> +#include <linux/preempt.h> +#include <linux/rbtree.h> +#include <linux/rwsem.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/pgtable.h> + +#include <asm/cacheflush.h> +#include <asm/efi.h> +#include <asm/mmu.h> +#include <asm/pgalloc.h> + +static bool __init efi_virtmap_init(void) +{ + efi_memory_desc_t *md; + + efi_mm.pgd = pgd_alloc(&efi_mm); + mm_init_cpumask(&efi_mm); + init_new_context(NULL, &efi_mm); + + for_each_efi_memory_desc(md) { + phys_addr_t phys = md->phys_addr; + int ret; + + if (!(md->attribute & EFI_MEMORY_RUNTIME)) + continue; + if (md->virt_addr == 0) + return false; + + ret = efi_create_mapping(&efi_mm, md); + if (ret) { + pr_warn(" EFI remap %pa: failed to create mapping (%d)\n", + &phys, ret); + return false; + } + } + + if (efi_memattr_apply_permissions(&efi_mm, efi_set_mapping_permissions)) + return false; + + return true; +} + +/* + * Enable the UEFI Runtime Services if all prerequisites are in place, i.e., + * non-early mapping of the UEFI system table and virtual mappings for all + * EFI_MEMORY_RUNTIME regions. + */ +static int __init riscv_enable_runtime_services(void) +{ + u64 mapsize; + + if (!efi_enabled(EFI_BOOT)) { + pr_info("EFI services will not be available.\n"); + return 0; + } + + efi_memmap_unmap(); + + mapsize = efi.memmap.desc_size * efi.memmap.nr_map; + + if (efi_memmap_init_late(efi.memmap.phys_map, mapsize)) { + pr_err("Failed to remap EFI memory map\n"); + return 0; + } + + if (efi_soft_reserve_enabled()) { + efi_memory_desc_t *md; + + for_each_efi_memory_desc(md) { + int md_size = md->num_pages << EFI_PAGE_SHIFT; + struct resource *res; + + if (!(md->attribute & EFI_MEMORY_SP)) + continue; + + res = kzalloc(sizeof(*res), GFP_KERNEL); + if (WARN_ON(!res)) + break; + + res->start = md->phys_addr; + res->end = md->phys_addr + md_size - 1; + res->name = "Soft Reserved"; + res->flags = IORESOURCE_MEM; + res->desc = IORES_DESC_SOFT_RESERVED; + + insert_resource(&iomem_resource, res); + } + } + + if (efi_runtime_disabled()) { + pr_info("EFI runtime services will be disabled.\n"); + return 0; + } + + if (efi_enabled(EFI_RUNTIME_SERVICES)) { + pr_info("EFI runtime services access via paravirt.\n"); + return 0; + } + + pr_info("Remapping and enabling EFI services.\n"); + + if (!efi_virtmap_init()) { + pr_err("UEFI virtual mapping missing or invalid -- runtime services will not be available\n"); + return -ENOMEM; + } + + /* Set up runtime services function pointers */ + efi_native_runtime_setup(); + set_bit(EFI_RUNTIME_SERVICES, &efi.flags); + + return 0; +} +early_initcall(riscv_enable_runtime_services); + +void efi_virtmap_load(void) +{ + preempt_disable(); + switch_mm(current->active_mm, &efi_mm, NULL); +} + +void efi_virtmap_unload(void) +{ + switch_mm(&efi_mm, current->active_mm, NULL); + preempt_enable(); +} diff --git a/drivers/firmware/efi/runtime-map.c b/drivers/firmware/efi/runtime-map.c new file mode 100644 index 000000000..ad9ddefc9 --- /dev/null +++ b/drivers/firmware/efi/runtime-map.c @@ -0,0 +1,192 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/drivers/efi/runtime-map.c + * Copyright (C) 2013 Red Hat, Inc., Dave Young <dyoung@redhat.com> + */ + +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/efi.h> +#include <linux/slab.h> + +#include <asm/setup.h> + +struct efi_runtime_map_entry { + efi_memory_desc_t md; + struct kobject kobj; /* kobject for each entry */ +}; + +static struct efi_runtime_map_entry **map_entries; + +struct map_attribute { + struct attribute attr; + ssize_t (*show)(struct efi_runtime_map_entry *entry, char *buf); +}; + +static inline struct map_attribute *to_map_attr(struct attribute *attr) +{ + return container_of(attr, struct map_attribute, attr); +} + +static ssize_t type_show(struct efi_runtime_map_entry *entry, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "0x%x\n", entry->md.type); +} + +#define EFI_RUNTIME_FIELD(var) entry->md.var + +#define EFI_RUNTIME_U64_ATTR_SHOW(name) \ +static ssize_t name##_show(struct efi_runtime_map_entry *entry, char *buf) \ +{ \ + return snprintf(buf, PAGE_SIZE, "0x%llx\n", EFI_RUNTIME_FIELD(name)); \ +} + +EFI_RUNTIME_U64_ATTR_SHOW(phys_addr); +EFI_RUNTIME_U64_ATTR_SHOW(virt_addr); +EFI_RUNTIME_U64_ATTR_SHOW(num_pages); +EFI_RUNTIME_U64_ATTR_SHOW(attribute); + +static inline struct efi_runtime_map_entry *to_map_entry(struct kobject *kobj) +{ + return container_of(kobj, struct efi_runtime_map_entry, kobj); +} + +static ssize_t map_attr_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + struct efi_runtime_map_entry *entry = to_map_entry(kobj); + struct map_attribute *map_attr = to_map_attr(attr); + + return map_attr->show(entry, buf); +} + +static struct map_attribute map_type_attr = __ATTR_RO_MODE(type, 0400); +static struct map_attribute map_phys_addr_attr = __ATTR_RO_MODE(phys_addr, 0400); +static struct map_attribute map_virt_addr_attr = __ATTR_RO_MODE(virt_addr, 0400); +static struct map_attribute map_num_pages_attr = __ATTR_RO_MODE(num_pages, 0400); +static struct map_attribute map_attribute_attr = __ATTR_RO_MODE(attribute, 0400); + +/* + * These are default attributes that are added for every memmap entry. + */ +static struct attribute *def_attrs[] = { + &map_type_attr.attr, + &map_phys_addr_attr.attr, + &map_virt_addr_attr.attr, + &map_num_pages_attr.attr, + &map_attribute_attr.attr, + NULL +}; + +static const struct sysfs_ops map_attr_ops = { + .show = map_attr_show, +}; + +static void map_release(struct kobject *kobj) +{ + struct efi_runtime_map_entry *entry; + + entry = to_map_entry(kobj); + kfree(entry); +} + +static struct kobj_type __refdata map_ktype = { + .sysfs_ops = &map_attr_ops, + .default_attrs = def_attrs, + .release = map_release, +}; + +static struct kset *map_kset; + +static struct efi_runtime_map_entry * +add_sysfs_runtime_map_entry(struct kobject *kobj, int nr, + efi_memory_desc_t *md) +{ + int ret; + struct efi_runtime_map_entry *entry; + + if (!map_kset) { + map_kset = kset_create_and_add("runtime-map", NULL, kobj); + if (!map_kset) + return ERR_PTR(-ENOMEM); + } + + entry = kzalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) { + kset_unregister(map_kset); + map_kset = NULL; + return ERR_PTR(-ENOMEM); + } + + memcpy(&entry->md, md, sizeof(efi_memory_desc_t)); + + kobject_init(&entry->kobj, &map_ktype); + entry->kobj.kset = map_kset; + ret = kobject_add(&entry->kobj, NULL, "%d", nr); + if (ret) { + kobject_put(&entry->kobj); + kset_unregister(map_kset); + map_kset = NULL; + return ERR_PTR(ret); + } + + return entry; +} + +int efi_get_runtime_map_size(void) +{ + return efi.memmap.nr_map * efi.memmap.desc_size; +} + +int efi_get_runtime_map_desc_size(void) +{ + return efi.memmap.desc_size; +} + +int efi_runtime_map_copy(void *buf, size_t bufsz) +{ + size_t sz = efi_get_runtime_map_size(); + + if (sz > bufsz) + sz = bufsz; + + memcpy(buf, efi.memmap.map, sz); + return 0; +} + +int __init efi_runtime_map_init(struct kobject *efi_kobj) +{ + int i, j, ret = 0; + struct efi_runtime_map_entry *entry; + efi_memory_desc_t *md; + + if (!efi_enabled(EFI_MEMMAP)) + return 0; + + map_entries = kcalloc(efi.memmap.nr_map, sizeof(entry), GFP_KERNEL); + if (!map_entries) { + ret = -ENOMEM; + goto out; + } + + i = 0; + for_each_efi_memory_desc(md) { + entry = add_sysfs_runtime_map_entry(efi_kobj, i, md); + if (IS_ERR(entry)) { + ret = PTR_ERR(entry); + goto out_add_entry; + } + *(map_entries + i++) = entry; + } + + return 0; +out_add_entry: + for (j = i - 1; j >= 0; j--) { + entry = *(map_entries + j); + kobject_put(&entry->kobj); + } +out: + return ret; +} diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c new file mode 100644 index 000000000..60075e0e4 --- /dev/null +++ b/drivers/firmware/efi/runtime-wrappers.c @@ -0,0 +1,479 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * runtime-wrappers.c - Runtime Services function call wrappers + * + * Implementation summary: + * ----------------------- + * 1. When user/kernel thread requests to execute efi_runtime_service(), + * enqueue work to efi_rts_wq. + * 2. Caller thread waits for completion until the work is finished + * because it's dependent on the return status and execution of + * efi_runtime_service(). + * For instance, get_variable() and get_next_variable(). + * + * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> + * + * Split off from arch/x86/platform/efi/efi.c + * + * Copyright (C) 1999 VA Linux Systems + * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> + * Copyright (C) 1999-2002 Hewlett-Packard Co. + * Copyright (C) 2005-2008 Intel Co. + * Copyright (C) 2013 SuSE Labs + */ + +#define pr_fmt(fmt) "efi: " fmt + +#include <linux/bug.h> +#include <linux/efi.h> +#include <linux/irqflags.h> +#include <linux/mutex.h> +#include <linux/semaphore.h> +#include <linux/stringify.h> +#include <linux/workqueue.h> +#include <linux/completion.h> + +#include <asm/efi.h> + +/* + * Wrap around the new efi_call_virt_generic() macros so that the + * code doesn't get too cluttered: + */ +#define efi_call_virt(f, args...) \ + efi_call_virt_pointer(efi.runtime, f, args) +#define __efi_call_virt(f, args...) \ + __efi_call_virt_pointer(efi.runtime, f, args) + +struct efi_runtime_work efi_rts_work; + +/* + * efi_queue_work: Queue efi_runtime_service() and wait until it's done + * @rts: efi_runtime_service() function identifier + * @rts_arg<1-5>: efi_runtime_service() function arguments + * + * Accesses to efi_runtime_services() are serialized by a binary + * semaphore (efi_runtime_lock) and caller waits until the work is + * finished, hence _only_ one work is queued at a time and the caller + * thread waits for completion. + */ +#define efi_queue_work(_rts, _arg1, _arg2, _arg3, _arg4, _arg5) \ +({ \ + efi_rts_work.status = EFI_ABORTED; \ + \ + if (!efi_enabled(EFI_RUNTIME_SERVICES)) { \ + pr_warn_once("EFI Runtime Services are disabled!\n"); \ + efi_rts_work.status = EFI_DEVICE_ERROR; \ + goto exit; \ + } \ + \ + init_completion(&efi_rts_work.efi_rts_comp); \ + INIT_WORK(&efi_rts_work.work, efi_call_rts); \ + efi_rts_work.arg1 = _arg1; \ + efi_rts_work.arg2 = _arg2; \ + efi_rts_work.arg3 = _arg3; \ + efi_rts_work.arg4 = _arg4; \ + efi_rts_work.arg5 = _arg5; \ + efi_rts_work.efi_rts_id = _rts; \ + \ + /* \ + * queue_work() returns 0 if work was already on queue, \ + * _ideally_ this should never happen. \ + */ \ + if (queue_work(efi_rts_wq, &efi_rts_work.work)) \ + wait_for_completion(&efi_rts_work.efi_rts_comp); \ + else \ + pr_err("Failed to queue work to efi_rts_wq.\n"); \ + \ +exit: \ + efi_rts_work.efi_rts_id = EFI_NONE; \ + efi_rts_work.status; \ +}) + +#ifndef arch_efi_save_flags +#define arch_efi_save_flags(state_flags) local_save_flags(state_flags) +#define arch_efi_restore_flags(state_flags) local_irq_restore(state_flags) +#endif + +unsigned long efi_call_virt_save_flags(void) +{ + unsigned long flags; + + arch_efi_save_flags(flags); + return flags; +} + +void efi_call_virt_check_flags(unsigned long flags, const char *call) +{ + unsigned long cur_flags, mismatch; + + cur_flags = efi_call_virt_save_flags(); + + mismatch = flags ^ cur_flags; + if (!WARN_ON_ONCE(mismatch & ARCH_EFI_IRQ_FLAGS_MASK)) + return; + + add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_NOW_UNRELIABLE); + pr_err_ratelimited(FW_BUG "IRQ flags corrupted (0x%08lx=>0x%08lx) by EFI %s\n", + flags, cur_flags, call); + arch_efi_restore_flags(flags); +} + +/* + * According to section 7.1 of the UEFI spec, Runtime Services are not fully + * reentrant, and there are particular combinations of calls that need to be + * serialized. (source: UEFI Specification v2.4A) + * + * Table 31. Rules for Reentry Into Runtime Services + * +------------------------------------+-------------------------------+ + * | If previous call is busy in | Forbidden to call | + * +------------------------------------+-------------------------------+ + * | Any | SetVirtualAddressMap() | + * +------------------------------------+-------------------------------+ + * | ConvertPointer() | ConvertPointer() | + * +------------------------------------+-------------------------------+ + * | SetVariable() | ResetSystem() | + * | UpdateCapsule() | | + * | SetTime() | | + * | SetWakeupTime() | | + * | GetNextHighMonotonicCount() | | + * +------------------------------------+-------------------------------+ + * | GetVariable() | GetVariable() | + * | GetNextVariableName() | GetNextVariableName() | + * | SetVariable() | SetVariable() | + * | QueryVariableInfo() | QueryVariableInfo() | + * | UpdateCapsule() | UpdateCapsule() | + * | QueryCapsuleCapabilities() | QueryCapsuleCapabilities() | + * | GetNextHighMonotonicCount() | GetNextHighMonotonicCount() | + * +------------------------------------+-------------------------------+ + * | GetTime() | GetTime() | + * | SetTime() | SetTime() | + * | GetWakeupTime() | GetWakeupTime() | + * | SetWakeupTime() | SetWakeupTime() | + * +------------------------------------+-------------------------------+ + * + * Due to the fact that the EFI pstore may write to the variable store in + * interrupt context, we need to use a lock for at least the groups that + * contain SetVariable() and QueryVariableInfo(). That leaves little else, as + * none of the remaining functions are actually ever called at runtime. + * So let's just use a single lock to serialize all Runtime Services calls. + */ +static DEFINE_SEMAPHORE(efi_runtime_lock); + +/* + * Expose the EFI runtime lock to the UV platform + */ +#ifdef CONFIG_X86_UV +extern struct semaphore __efi_uv_runtime_lock __alias(efi_runtime_lock); +#endif + +/* + * Calls the appropriate efi_runtime_service() with the appropriate + * arguments. + * + * Semantics followed by efi_call_rts() to understand efi_runtime_work: + * 1. If argument was a pointer, recast it from void pointer to original + * pointer type. + * 2. If argument was a value, recast it from void pointer to original + * pointer type and dereference it. + */ +static void efi_call_rts(struct work_struct *work) +{ + void *arg1, *arg2, *arg3, *arg4, *arg5; + efi_status_t status = EFI_NOT_FOUND; + + arg1 = efi_rts_work.arg1; + arg2 = efi_rts_work.arg2; + arg3 = efi_rts_work.arg3; + arg4 = efi_rts_work.arg4; + arg5 = efi_rts_work.arg5; + + switch (efi_rts_work.efi_rts_id) { + case EFI_GET_TIME: + status = efi_call_virt(get_time, (efi_time_t *)arg1, + (efi_time_cap_t *)arg2); + break; + case EFI_SET_TIME: + status = efi_call_virt(set_time, (efi_time_t *)arg1); + break; + case EFI_GET_WAKEUP_TIME: + status = efi_call_virt(get_wakeup_time, (efi_bool_t *)arg1, + (efi_bool_t *)arg2, (efi_time_t *)arg3); + break; + case EFI_SET_WAKEUP_TIME: + status = efi_call_virt(set_wakeup_time, *(efi_bool_t *)arg1, + (efi_time_t *)arg2); + break; + case EFI_GET_VARIABLE: + status = efi_call_virt(get_variable, (efi_char16_t *)arg1, + (efi_guid_t *)arg2, (u32 *)arg3, + (unsigned long *)arg4, (void *)arg5); + break; + case EFI_GET_NEXT_VARIABLE: + status = efi_call_virt(get_next_variable, (unsigned long *)arg1, + (efi_char16_t *)arg2, + (efi_guid_t *)arg3); + break; + case EFI_SET_VARIABLE: + status = efi_call_virt(set_variable, (efi_char16_t *)arg1, + (efi_guid_t *)arg2, *(u32 *)arg3, + *(unsigned long *)arg4, (void *)arg5); + break; + case EFI_QUERY_VARIABLE_INFO: + status = efi_call_virt(query_variable_info, *(u32 *)arg1, + (u64 *)arg2, (u64 *)arg3, (u64 *)arg4); + break; + case EFI_GET_NEXT_HIGH_MONO_COUNT: + status = efi_call_virt(get_next_high_mono_count, (u32 *)arg1); + break; + case EFI_UPDATE_CAPSULE: + status = efi_call_virt(update_capsule, + (efi_capsule_header_t **)arg1, + *(unsigned long *)arg2, + *(unsigned long *)arg3); + break; + case EFI_QUERY_CAPSULE_CAPS: + status = efi_call_virt(query_capsule_caps, + (efi_capsule_header_t **)arg1, + *(unsigned long *)arg2, (u64 *)arg3, + (int *)arg4); + break; + default: + /* + * Ideally, we should never reach here because a caller of this + * function should have put the right efi_runtime_service() + * function identifier into efi_rts_work->efi_rts_id + */ + pr_err("Requested executing invalid EFI Runtime Service.\n"); + } + efi_rts_work.status = status; + complete(&efi_rts_work.efi_rts_comp); +} + +static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) +{ + efi_status_t status; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_GET_TIME, tm, tc, NULL, NULL, NULL); + up(&efi_runtime_lock); + return status; +} + +static efi_status_t virt_efi_set_time(efi_time_t *tm) +{ + efi_status_t status; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_SET_TIME, tm, NULL, NULL, NULL, NULL); + up(&efi_runtime_lock); + return status; +} + +static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled, + efi_bool_t *pending, + efi_time_t *tm) +{ + efi_status_t status; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_GET_WAKEUP_TIME, enabled, pending, tm, NULL, + NULL); + up(&efi_runtime_lock); + return status; +} + +static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) +{ + efi_status_t status; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_SET_WAKEUP_TIME, &enabled, tm, NULL, NULL, + NULL); + up(&efi_runtime_lock); + return status; +} + +static efi_status_t virt_efi_get_variable(efi_char16_t *name, + efi_guid_t *vendor, + u32 *attr, + unsigned long *data_size, + void *data) +{ + efi_status_t status; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_GET_VARIABLE, name, vendor, attr, data_size, + data); + up(&efi_runtime_lock); + return status; +} + +static efi_status_t virt_efi_get_next_variable(unsigned long *name_size, + efi_char16_t *name, + efi_guid_t *vendor) +{ + efi_status_t status; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_GET_NEXT_VARIABLE, name_size, name, vendor, + NULL, NULL); + up(&efi_runtime_lock); + return status; +} + +static efi_status_t virt_efi_set_variable(efi_char16_t *name, + efi_guid_t *vendor, + u32 attr, + unsigned long data_size, + void *data) +{ + efi_status_t status; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_SET_VARIABLE, name, vendor, &attr, &data_size, + data); + up(&efi_runtime_lock); + return status; +} + +static efi_status_t +virt_efi_set_variable_nonblocking(efi_char16_t *name, efi_guid_t *vendor, + u32 attr, unsigned long data_size, + void *data) +{ + efi_status_t status; + + if (down_trylock(&efi_runtime_lock)) + return EFI_NOT_READY; + + status = efi_call_virt(set_variable, name, vendor, attr, data_size, + data); + up(&efi_runtime_lock); + return status; +} + + +static efi_status_t virt_efi_query_variable_info(u32 attr, + u64 *storage_space, + u64 *remaining_space, + u64 *max_variable_size) +{ + efi_status_t status; + + if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) + return EFI_UNSUPPORTED; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_QUERY_VARIABLE_INFO, &attr, storage_space, + remaining_space, max_variable_size, NULL); + up(&efi_runtime_lock); + return status; +} + +static efi_status_t +virt_efi_query_variable_info_nonblocking(u32 attr, + u64 *storage_space, + u64 *remaining_space, + u64 *max_variable_size) +{ + efi_status_t status; + + if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) + return EFI_UNSUPPORTED; + + if (down_trylock(&efi_runtime_lock)) + return EFI_NOT_READY; + + status = efi_call_virt(query_variable_info, attr, storage_space, + remaining_space, max_variable_size); + up(&efi_runtime_lock); + return status; +} + +static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) +{ + efi_status_t status; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_GET_NEXT_HIGH_MONO_COUNT, count, NULL, NULL, + NULL, NULL); + up(&efi_runtime_lock); + return status; +} + +static void virt_efi_reset_system(int reset_type, + efi_status_t status, + unsigned long data_size, + efi_char16_t *data) +{ + if (down_trylock(&efi_runtime_lock)) { + pr_warn("failed to invoke the reset_system() runtime service:\n" + "could not get exclusive access to the firmware\n"); + return; + } + efi_rts_work.efi_rts_id = EFI_RESET_SYSTEM; + __efi_call_virt(reset_system, reset_type, status, data_size, data); + up(&efi_runtime_lock); +} + +static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules, + unsigned long count, + unsigned long sg_list) +{ + efi_status_t status; + + if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) + return EFI_UNSUPPORTED; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_UPDATE_CAPSULE, capsules, &count, &sg_list, + NULL, NULL); + up(&efi_runtime_lock); + return status; +} + +static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules, + unsigned long count, + u64 *max_size, + int *reset_type) +{ + efi_status_t status; + + if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) + return EFI_UNSUPPORTED; + + if (down_interruptible(&efi_runtime_lock)) + return EFI_ABORTED; + status = efi_queue_work(EFI_QUERY_CAPSULE_CAPS, capsules, &count, + max_size, reset_type, NULL); + up(&efi_runtime_lock); + return status; +} + +void efi_native_runtime_setup(void) +{ + efi.get_time = virt_efi_get_time; + efi.set_time = virt_efi_set_time; + efi.get_wakeup_time = virt_efi_get_wakeup_time; + efi.set_wakeup_time = virt_efi_set_wakeup_time; + efi.get_variable = virt_efi_get_variable; + efi.get_next_variable = virt_efi_get_next_variable; + efi.set_variable = virt_efi_set_variable; + efi.set_variable_nonblocking = virt_efi_set_variable_nonblocking; + efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; + efi.reset_system = virt_efi_reset_system; + efi.query_variable_info = virt_efi_query_variable_info; + efi.query_variable_info_nonblocking = virt_efi_query_variable_info_nonblocking; + efi.update_capsule = virt_efi_update_capsule; + efi.query_capsule_caps = virt_efi_query_capsule_caps; +} diff --git a/drivers/firmware/efi/test/Makefile b/drivers/firmware/efi/test/Makefile new file mode 100644 index 000000000..419708855 --- /dev/null +++ b/drivers/firmware/efi/test/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_EFI_TEST) += efi_test.o diff --git a/drivers/firmware/efi/test/efi_test.c b/drivers/firmware/efi/test/efi_test.c new file mode 100644 index 000000000..ddf9eae39 --- /dev/null +++ b/drivers/firmware/efi/test/efi_test.c @@ -0,0 +1,766 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * EFI Test Driver for Runtime Services + * + * Copyright(C) 2012-2016 Canonical Ltd. + * + * This driver exports EFI runtime services interfaces into userspace, which + * allow to use and test UEFI runtime services provided by firmware. + * + */ + +#include <linux/miscdevice.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/efi.h> +#include <linux/security.h> +#include <linux/slab.h> +#include <linux/uaccess.h> + +#include "efi_test.h" + +MODULE_AUTHOR("Ivan Hu <ivan.hu@canonical.com>"); +MODULE_DESCRIPTION("EFI Test Driver"); +MODULE_LICENSE("GPL"); + +/* + * Count the bytes in 'str', including the terminating NULL. + * + * Note this function returns the number of *bytes*, not the number of + * ucs2 characters. + */ +static inline size_t user_ucs2_strsize(efi_char16_t __user *str) +{ + efi_char16_t *s = str, c; + size_t len; + + if (!str) + return 0; + + /* Include terminating NULL */ + len = sizeof(efi_char16_t); + + if (get_user(c, s++)) { + /* Can't read userspace memory for size */ + return 0; + } + + while (c != 0) { + if (get_user(c, s++)) { + /* Can't read userspace memory for size */ + return 0; + } + len += sizeof(efi_char16_t); + } + return len; +} + +/* + * Allocate a buffer and copy a ucs2 string from user space into it. + */ +static inline int +copy_ucs2_from_user_len(efi_char16_t **dst, efi_char16_t __user *src, + size_t len) +{ + efi_char16_t *buf; + + if (!src) { + *dst = NULL; + return 0; + } + + buf = memdup_user(src, len); + if (IS_ERR(buf)) { + *dst = NULL; + return PTR_ERR(buf); + } + *dst = buf; + + return 0; +} + +/* + * Count the bytes in 'str', including the terminating NULL. + * + * Just a wrap for user_ucs2_strsize + */ +static inline int +get_ucs2_strsize_from_user(efi_char16_t __user *src, size_t *len) +{ + *len = user_ucs2_strsize(src); + if (*len == 0) + return -EFAULT; + + return 0; +} + +/* + * Calculate the required buffer allocation size and copy a ucs2 string + * from user space into it. + * + * This function differs from copy_ucs2_from_user_len() because it + * calculates the size of the buffer to allocate by taking the length of + * the string 'src'. + * + * If a non-zero value is returned, the caller MUST NOT access 'dst'. + * + * It is the caller's responsibility to free 'dst'. + */ +static inline int +copy_ucs2_from_user(efi_char16_t **dst, efi_char16_t __user *src) +{ + size_t len; + + len = user_ucs2_strsize(src); + if (len == 0) + return -EFAULT; + return copy_ucs2_from_user_len(dst, src, len); +} + +/* + * Copy a ucs2 string to a user buffer. + * + * This function is a simple wrapper around copy_to_user() that does + * nothing if 'src' is NULL, which is useful for reducing the amount of + * NULL checking the caller has to do. + * + * 'len' specifies the number of bytes to copy. + */ +static inline int +copy_ucs2_to_user_len(efi_char16_t __user *dst, efi_char16_t *src, size_t len) +{ + if (!src) + return 0; + + return copy_to_user(dst, src, len); +} + +static long efi_runtime_get_variable(unsigned long arg) +{ + struct efi_getvariable __user *getvariable_user; + struct efi_getvariable getvariable; + unsigned long datasize = 0, prev_datasize, *dz; + efi_guid_t vendor_guid, *vd = NULL; + efi_status_t status; + efi_char16_t *name = NULL; + u32 attr, *at; + void *data = NULL; + int rv = 0; + + getvariable_user = (struct efi_getvariable __user *)arg; + + if (copy_from_user(&getvariable, getvariable_user, + sizeof(getvariable))) + return -EFAULT; + if (getvariable.data_size && + get_user(datasize, getvariable.data_size)) + return -EFAULT; + if (getvariable.vendor_guid) { + if (copy_from_user(&vendor_guid, getvariable.vendor_guid, + sizeof(vendor_guid))) + return -EFAULT; + vd = &vendor_guid; + } + + if (getvariable.variable_name) { + rv = copy_ucs2_from_user(&name, getvariable.variable_name); + if (rv) + return rv; + } + + at = getvariable.attributes ? &attr : NULL; + dz = getvariable.data_size ? &datasize : NULL; + + if (getvariable.data_size && getvariable.data) { + data = kmalloc(datasize, GFP_KERNEL); + if (!data) { + kfree(name); + return -ENOMEM; + } + } + + prev_datasize = datasize; + status = efi.get_variable(name, vd, at, dz, data); + kfree(name); + + if (put_user(status, getvariable.status)) { + rv = -EFAULT; + goto out; + } + + if (status != EFI_SUCCESS) { + if (status == EFI_BUFFER_TOO_SMALL) { + if (dz && put_user(datasize, getvariable.data_size)) { + rv = -EFAULT; + goto out; + } + } + rv = -EINVAL; + goto out; + } + + if (prev_datasize < datasize) { + rv = -EINVAL; + goto out; + } + + if (data) { + if (copy_to_user(getvariable.data, data, datasize)) { + rv = -EFAULT; + goto out; + } + } + + if (at && put_user(attr, getvariable.attributes)) { + rv = -EFAULT; + goto out; + } + + if (dz && put_user(datasize, getvariable.data_size)) + rv = -EFAULT; + +out: + kfree(data); + return rv; + +} + +static long efi_runtime_set_variable(unsigned long arg) +{ + struct efi_setvariable __user *setvariable_user; + struct efi_setvariable setvariable; + efi_guid_t vendor_guid; + efi_status_t status; + efi_char16_t *name = NULL; + void *data; + int rv = 0; + + setvariable_user = (struct efi_setvariable __user *)arg; + + if (copy_from_user(&setvariable, setvariable_user, sizeof(setvariable))) + return -EFAULT; + if (copy_from_user(&vendor_guid, setvariable.vendor_guid, + sizeof(vendor_guid))) + return -EFAULT; + + if (setvariable.variable_name) { + rv = copy_ucs2_from_user(&name, setvariable.variable_name); + if (rv) + return rv; + } + + data = memdup_user(setvariable.data, setvariable.data_size); + if (IS_ERR(data)) { + kfree(name); + return PTR_ERR(data); + } + + status = efi.set_variable(name, &vendor_guid, + setvariable.attributes, + setvariable.data_size, data); + + if (put_user(status, setvariable.status)) { + rv = -EFAULT; + goto out; + } + + rv = status == EFI_SUCCESS ? 0 : -EINVAL; + +out: + kfree(data); + kfree(name); + + return rv; +} + +static long efi_runtime_get_time(unsigned long arg) +{ + struct efi_gettime __user *gettime_user; + struct efi_gettime gettime; + efi_status_t status; + efi_time_cap_t cap; + efi_time_t efi_time; + + gettime_user = (struct efi_gettime __user *)arg; + if (copy_from_user(&gettime, gettime_user, sizeof(gettime))) + return -EFAULT; + + status = efi.get_time(gettime.time ? &efi_time : NULL, + gettime.capabilities ? &cap : NULL); + + if (put_user(status, gettime.status)) + return -EFAULT; + + if (status != EFI_SUCCESS) + return -EINVAL; + + if (gettime.capabilities) { + efi_time_cap_t __user *cap_local; + + cap_local = (efi_time_cap_t *)gettime.capabilities; + if (put_user(cap.resolution, &(cap_local->resolution)) || + put_user(cap.accuracy, &(cap_local->accuracy)) || + put_user(cap.sets_to_zero, &(cap_local->sets_to_zero))) + return -EFAULT; + } + if (gettime.time) { + if (copy_to_user(gettime.time, &efi_time, sizeof(efi_time_t))) + return -EFAULT; + } + + return 0; +} + +static long efi_runtime_set_time(unsigned long arg) +{ + struct efi_settime __user *settime_user; + struct efi_settime settime; + efi_status_t status; + efi_time_t efi_time; + + settime_user = (struct efi_settime __user *)arg; + if (copy_from_user(&settime, settime_user, sizeof(settime))) + return -EFAULT; + if (copy_from_user(&efi_time, settime.time, + sizeof(efi_time_t))) + return -EFAULT; + status = efi.set_time(&efi_time); + + if (put_user(status, settime.status)) + return -EFAULT; + + return status == EFI_SUCCESS ? 0 : -EINVAL; +} + +static long efi_runtime_get_waketime(unsigned long arg) +{ + struct efi_getwakeuptime __user *getwakeuptime_user; + struct efi_getwakeuptime getwakeuptime; + efi_bool_t enabled, pending; + efi_status_t status; + efi_time_t efi_time; + + getwakeuptime_user = (struct efi_getwakeuptime __user *)arg; + if (copy_from_user(&getwakeuptime, getwakeuptime_user, + sizeof(getwakeuptime))) + return -EFAULT; + + status = efi.get_wakeup_time( + getwakeuptime.enabled ? (efi_bool_t *)&enabled : NULL, + getwakeuptime.pending ? (efi_bool_t *)&pending : NULL, + getwakeuptime.time ? &efi_time : NULL); + + if (put_user(status, getwakeuptime.status)) + return -EFAULT; + + if (status != EFI_SUCCESS) + return -EINVAL; + + if (getwakeuptime.enabled && put_user(enabled, + getwakeuptime.enabled)) + return -EFAULT; + + if (getwakeuptime.time) { + if (copy_to_user(getwakeuptime.time, &efi_time, + sizeof(efi_time_t))) + return -EFAULT; + } + + return 0; +} + +static long efi_runtime_set_waketime(unsigned long arg) +{ + struct efi_setwakeuptime __user *setwakeuptime_user; + struct efi_setwakeuptime setwakeuptime; + efi_bool_t enabled; + efi_status_t status; + efi_time_t efi_time; + + setwakeuptime_user = (struct efi_setwakeuptime __user *)arg; + + if (copy_from_user(&setwakeuptime, setwakeuptime_user, + sizeof(setwakeuptime))) + return -EFAULT; + + enabled = setwakeuptime.enabled; + if (setwakeuptime.time) { + if (copy_from_user(&efi_time, setwakeuptime.time, + sizeof(efi_time_t))) + return -EFAULT; + + status = efi.set_wakeup_time(enabled, &efi_time); + } else + status = efi.set_wakeup_time(enabled, NULL); + + if (put_user(status, setwakeuptime.status)) + return -EFAULT; + + return status == EFI_SUCCESS ? 0 : -EINVAL; +} + +static long efi_runtime_get_nextvariablename(unsigned long arg) +{ + struct efi_getnextvariablename __user *getnextvariablename_user; + struct efi_getnextvariablename getnextvariablename; + unsigned long name_size, prev_name_size = 0, *ns = NULL; + efi_status_t status; + efi_guid_t *vd = NULL; + efi_guid_t vendor_guid; + efi_char16_t *name = NULL; + int rv = 0; + + getnextvariablename_user = (struct efi_getnextvariablename __user *)arg; + + if (copy_from_user(&getnextvariablename, getnextvariablename_user, + sizeof(getnextvariablename))) + return -EFAULT; + + if (getnextvariablename.variable_name_size) { + if (get_user(name_size, getnextvariablename.variable_name_size)) + return -EFAULT; + ns = &name_size; + prev_name_size = name_size; + } + + if (getnextvariablename.vendor_guid) { + if (copy_from_user(&vendor_guid, + getnextvariablename.vendor_guid, + sizeof(vendor_guid))) + return -EFAULT; + vd = &vendor_guid; + } + + if (getnextvariablename.variable_name) { + size_t name_string_size = 0; + + rv = get_ucs2_strsize_from_user( + getnextvariablename.variable_name, + &name_string_size); + if (rv) + return rv; + /* + * The name_size may be smaller than the real buffer size where + * variable name located in some use cases. The most typical + * case is passing a 0 to get the required buffer size for the + * 1st time call. So we need to copy the content from user + * space for at least the string size of variable name, or else + * the name passed to UEFI may not be terminated as we expected. + */ + rv = copy_ucs2_from_user_len(&name, + getnextvariablename.variable_name, + prev_name_size > name_string_size ? + prev_name_size : name_string_size); + if (rv) + return rv; + } + + status = efi.get_next_variable(ns, name, vd); + + if (put_user(status, getnextvariablename.status)) { + rv = -EFAULT; + goto out; + } + + if (status != EFI_SUCCESS) { + if (status == EFI_BUFFER_TOO_SMALL) { + if (ns && put_user(*ns, + getnextvariablename.variable_name_size)) { + rv = -EFAULT; + goto out; + } + } + rv = -EINVAL; + goto out; + } + + if (name) { + if (copy_ucs2_to_user_len(getnextvariablename.variable_name, + name, prev_name_size)) { + rv = -EFAULT; + goto out; + } + } + + if (ns) { + if (put_user(*ns, getnextvariablename.variable_name_size)) { + rv = -EFAULT; + goto out; + } + } + + if (vd) { + if (copy_to_user(getnextvariablename.vendor_guid, vd, + sizeof(efi_guid_t))) + rv = -EFAULT; + } + +out: + kfree(name); + return rv; +} + +static long efi_runtime_get_nexthighmonocount(unsigned long arg) +{ + struct efi_getnexthighmonotoniccount __user *getnexthighmonocount_user; + struct efi_getnexthighmonotoniccount getnexthighmonocount; + efi_status_t status; + u32 count; + + getnexthighmonocount_user = (struct + efi_getnexthighmonotoniccount __user *)arg; + + if (copy_from_user(&getnexthighmonocount, + getnexthighmonocount_user, + sizeof(getnexthighmonocount))) + return -EFAULT; + + status = efi.get_next_high_mono_count( + getnexthighmonocount.high_count ? &count : NULL); + + if (put_user(status, getnexthighmonocount.status)) + return -EFAULT; + + if (status != EFI_SUCCESS) + return -EINVAL; + + if (getnexthighmonocount.high_count && + put_user(count, getnexthighmonocount.high_count)) + return -EFAULT; + + return 0; +} + +static long efi_runtime_reset_system(unsigned long arg) +{ + struct efi_resetsystem __user *resetsystem_user; + struct efi_resetsystem resetsystem; + void *data = NULL; + + resetsystem_user = (struct efi_resetsystem __user *)arg; + if (copy_from_user(&resetsystem, resetsystem_user, + sizeof(resetsystem))) + return -EFAULT; + if (resetsystem.data_size != 0) { + data = memdup_user((void *)resetsystem.data, + resetsystem.data_size); + if (IS_ERR(data)) + return PTR_ERR(data); + } + + efi.reset_system(resetsystem.reset_type, resetsystem.status, + resetsystem.data_size, (efi_char16_t *)data); + + kfree(data); + return 0; +} + +static long efi_runtime_query_variableinfo(unsigned long arg) +{ + struct efi_queryvariableinfo __user *queryvariableinfo_user; + struct efi_queryvariableinfo queryvariableinfo; + efi_status_t status; + u64 max_storage, remaining, max_size; + + queryvariableinfo_user = (struct efi_queryvariableinfo __user *)arg; + + if (copy_from_user(&queryvariableinfo, queryvariableinfo_user, + sizeof(queryvariableinfo))) + return -EFAULT; + + status = efi.query_variable_info(queryvariableinfo.attributes, + &max_storage, &remaining, &max_size); + + if (put_user(status, queryvariableinfo.status)) + return -EFAULT; + + if (status != EFI_SUCCESS) + return -EINVAL; + + if (put_user(max_storage, + queryvariableinfo.maximum_variable_storage_size)) + return -EFAULT; + + if (put_user(remaining, + queryvariableinfo.remaining_variable_storage_size)) + return -EFAULT; + + if (put_user(max_size, queryvariableinfo.maximum_variable_size)) + return -EFAULT; + + return 0; +} + +static long efi_runtime_query_capsulecaps(unsigned long arg) +{ + struct efi_querycapsulecapabilities __user *qcaps_user; + struct efi_querycapsulecapabilities qcaps; + efi_capsule_header_t *capsules; + efi_status_t status; + u64 max_size; + int i, reset_type; + int rv = 0; + + qcaps_user = (struct efi_querycapsulecapabilities __user *)arg; + + if (copy_from_user(&qcaps, qcaps_user, sizeof(qcaps))) + return -EFAULT; + + if (qcaps.capsule_count == ULONG_MAX) + return -EINVAL; + + capsules = kcalloc(qcaps.capsule_count + 1, + sizeof(efi_capsule_header_t), GFP_KERNEL); + if (!capsules) + return -ENOMEM; + + for (i = 0; i < qcaps.capsule_count; i++) { + efi_capsule_header_t *c; + /* + * We cannot dereference qcaps.capsule_header_array directly to + * obtain the address of the capsule as it resides in the + * user space + */ + if (get_user(c, qcaps.capsule_header_array + i)) { + rv = -EFAULT; + goto out; + } + if (copy_from_user(&capsules[i], c, + sizeof(efi_capsule_header_t))) { + rv = -EFAULT; + goto out; + } + } + + qcaps.capsule_header_array = &capsules; + + status = efi.query_capsule_caps((efi_capsule_header_t **) + qcaps.capsule_header_array, + qcaps.capsule_count, + &max_size, &reset_type); + + if (put_user(status, qcaps.status)) { + rv = -EFAULT; + goto out; + } + + if (status != EFI_SUCCESS) { + rv = -EINVAL; + goto out; + } + + if (put_user(max_size, qcaps.maximum_capsule_size)) { + rv = -EFAULT; + goto out; + } + + if (put_user(reset_type, qcaps.reset_type)) + rv = -EFAULT; + +out: + kfree(capsules); + return rv; +} + +static long efi_test_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + switch (cmd) { + case EFI_RUNTIME_GET_VARIABLE: + return efi_runtime_get_variable(arg); + + case EFI_RUNTIME_SET_VARIABLE: + return efi_runtime_set_variable(arg); + + case EFI_RUNTIME_GET_TIME: + return efi_runtime_get_time(arg); + + case EFI_RUNTIME_SET_TIME: + return efi_runtime_set_time(arg); + + case EFI_RUNTIME_GET_WAKETIME: + return efi_runtime_get_waketime(arg); + + case EFI_RUNTIME_SET_WAKETIME: + return efi_runtime_set_waketime(arg); + + case EFI_RUNTIME_GET_NEXTVARIABLENAME: + return efi_runtime_get_nextvariablename(arg); + + case EFI_RUNTIME_GET_NEXTHIGHMONOTONICCOUNT: + return efi_runtime_get_nexthighmonocount(arg); + + case EFI_RUNTIME_QUERY_VARIABLEINFO: + return efi_runtime_query_variableinfo(arg); + + case EFI_RUNTIME_QUERY_CAPSULECAPABILITIES: + return efi_runtime_query_capsulecaps(arg); + + case EFI_RUNTIME_RESET_SYSTEM: + return efi_runtime_reset_system(arg); + } + + return -ENOTTY; +} + +static int efi_test_open(struct inode *inode, struct file *file) +{ + int ret = security_locked_down(LOCKDOWN_EFI_TEST); + + if (ret) + return ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + /* + * nothing special to do here + * We do accept multiple open files at the same time as we + * synchronize on the per call operation. + */ + return 0; +} + +static int efi_test_close(struct inode *inode, struct file *file) +{ + return 0; +} + +/* + * The various file operations we support. + */ +static const struct file_operations efi_test_fops = { + .owner = THIS_MODULE, + .unlocked_ioctl = efi_test_ioctl, + .open = efi_test_open, + .release = efi_test_close, + .llseek = no_llseek, +}; + +static struct miscdevice efi_test_dev = { + MISC_DYNAMIC_MINOR, + "efi_test", + &efi_test_fops +}; + +static int __init efi_test_init(void) +{ + int ret; + + ret = misc_register(&efi_test_dev); + if (ret) { + pr_err("efi_test: can't misc_register on minor=%d\n", + MISC_DYNAMIC_MINOR); + return ret; + } + + return 0; +} + +static void __exit efi_test_exit(void) +{ + misc_deregister(&efi_test_dev); +} + +module_init(efi_test_init); +module_exit(efi_test_exit); diff --git a/drivers/firmware/efi/test/efi_test.h b/drivers/firmware/efi/test/efi_test.h new file mode 100644 index 000000000..f2446aa1c --- /dev/null +++ b/drivers/firmware/efi/test/efi_test.h @@ -0,0 +1,121 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * EFI Test driver Header + * + * Copyright(C) 2012-2016 Canonical Ltd. + * + */ + +#ifndef _DRIVERS_FIRMWARE_EFI_TEST_H_ +#define _DRIVERS_FIRMWARE_EFI_TEST_H_ + +#include <linux/efi.h> + +struct efi_getvariable { + efi_char16_t *variable_name; + efi_guid_t *vendor_guid; + u32 *attributes; + unsigned long *data_size; + void *data; + efi_status_t *status; +} __packed; + +struct efi_setvariable { + efi_char16_t *variable_name; + efi_guid_t *vendor_guid; + u32 attributes; + unsigned long data_size; + void *data; + efi_status_t *status; +} __packed; + +struct efi_getnextvariablename { + unsigned long *variable_name_size; + efi_char16_t *variable_name; + efi_guid_t *vendor_guid; + efi_status_t *status; +} __packed; + +struct efi_queryvariableinfo { + u32 attributes; + u64 *maximum_variable_storage_size; + u64 *remaining_variable_storage_size; + u64 *maximum_variable_size; + efi_status_t *status; +} __packed; + +struct efi_gettime { + efi_time_t *time; + efi_time_cap_t *capabilities; + efi_status_t *status; +} __packed; + +struct efi_settime { + efi_time_t *time; + efi_status_t *status; +} __packed; + +struct efi_getwakeuptime { + efi_bool_t *enabled; + efi_bool_t *pending; + efi_time_t *time; + efi_status_t *status; +} __packed; + +struct efi_setwakeuptime { + efi_bool_t enabled; + efi_time_t *time; + efi_status_t *status; +} __packed; + +struct efi_getnexthighmonotoniccount { + u32 *high_count; + efi_status_t *status; +} __packed; + +struct efi_querycapsulecapabilities { + efi_capsule_header_t **capsule_header_array; + unsigned long capsule_count; + u64 *maximum_capsule_size; + int *reset_type; + efi_status_t *status; +} __packed; + +struct efi_resetsystem { + int reset_type; + efi_status_t status; + unsigned long data_size; + efi_char16_t *data; +} __packed; + +#define EFI_RUNTIME_GET_VARIABLE \ + _IOWR('p', 0x01, struct efi_getvariable) +#define EFI_RUNTIME_SET_VARIABLE \ + _IOW('p', 0x02, struct efi_setvariable) + +#define EFI_RUNTIME_GET_TIME \ + _IOR('p', 0x03, struct efi_gettime) +#define EFI_RUNTIME_SET_TIME \ + _IOW('p', 0x04, struct efi_settime) + +#define EFI_RUNTIME_GET_WAKETIME \ + _IOR('p', 0x05, struct efi_getwakeuptime) +#define EFI_RUNTIME_SET_WAKETIME \ + _IOW('p', 0x06, struct efi_setwakeuptime) + +#define EFI_RUNTIME_GET_NEXTVARIABLENAME \ + _IOWR('p', 0x07, struct efi_getnextvariablename) + +#define EFI_RUNTIME_QUERY_VARIABLEINFO \ + _IOR('p', 0x08, struct efi_queryvariableinfo) + +#define EFI_RUNTIME_GET_NEXTHIGHMONOTONICCOUNT \ + _IOR('p', 0x09, struct efi_getnexthighmonotoniccount) + +#define EFI_RUNTIME_QUERY_CAPSULECAPABILITIES \ + _IOR('p', 0x0A, struct efi_querycapsulecapabilities) + +#define EFI_RUNTIME_RESET_SYSTEM \ + _IOW('p', 0x0B, struct efi_resetsystem) + +#endif /* _DRIVERS_FIRMWARE_EFI_TEST_H_ */ diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c new file mode 100644 index 000000000..e8d69bd54 --- /dev/null +++ b/drivers/firmware/efi/tpm.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2017 Google, Inc. + * Thiebaud Weksteen <tweek@google.com> + */ + +#define TPM_MEMREMAP(start, size) early_memremap(start, size) +#define TPM_MEMUNMAP(start, size) early_memunmap(start, size) + +#include <asm/early_ioremap.h> +#include <linux/efi.h> +#include <linux/init.h> +#include <linux/memblock.h> +#include <linux/tpm_eventlog.h> + +int efi_tpm_final_log_size; +EXPORT_SYMBOL(efi_tpm_final_log_size); + +static int __init tpm2_calc_event_log_size(void *data, int count, void *size_info) +{ + struct tcg_pcr_event2_head *header; + int event_size, size = 0; + + while (count > 0) { + header = data + size; + event_size = __calc_tpm2_event_size(header, size_info, true); + if (event_size == 0) + return -1; + size += event_size; + count--; + } + + return size; +} + +/* + * Reserve the memory associated with the TPM Event Log configuration table. + */ +int __init efi_tpm_eventlog_init(void) +{ + struct linux_efi_tpm_eventlog *log_tbl; + struct efi_tcg2_final_events_table *final_tbl; + int tbl_size; + int ret = 0; + + if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) { + /* + * We can't calculate the size of the final events without the + * first entry in the TPM log, so bail here. + */ + return 0; + } + + log_tbl = early_memremap(efi.tpm_log, sizeof(*log_tbl)); + if (!log_tbl) { + pr_err("Failed to map TPM Event Log table @ 0x%lx\n", + efi.tpm_log); + efi.tpm_log = EFI_INVALID_TABLE_ADDR; + return -ENOMEM; + } + + tbl_size = sizeof(*log_tbl) + log_tbl->size; + memblock_reserve(efi.tpm_log, tbl_size); + + if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR) { + pr_info("TPM Final Events table not present\n"); + goto out; + } else if (log_tbl->version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) { + pr_warn(FW_BUG "TPM Final Events table invalid\n"); + goto out; + } + + final_tbl = early_memremap(efi.tpm_final_log, sizeof(*final_tbl)); + + if (!final_tbl) { + pr_err("Failed to map TPM Final Event Log table @ 0x%lx\n", + efi.tpm_final_log); + efi.tpm_final_log = EFI_INVALID_TABLE_ADDR; + ret = -ENOMEM; + goto out; + } + + tbl_size = 0; + if (final_tbl->nr_events != 0) { + void *events = (void *)efi.tpm_final_log + + sizeof(final_tbl->version) + + sizeof(final_tbl->nr_events); + + tbl_size = tpm2_calc_event_log_size(events, + final_tbl->nr_events, + log_tbl->log); + } + + if (tbl_size < 0) { + pr_err(FW_BUG "Failed to parse event in TPM Final Events Log\n"); + ret = -EINVAL; + goto out_calc; + } + + memblock_reserve(efi.tpm_final_log, + tbl_size + sizeof(*final_tbl)); + efi_tpm_final_log_size = tbl_size; + +out_calc: + early_memunmap(final_tbl, sizeof(*final_tbl)); +out: + early_memunmap(log_tbl, sizeof(*log_tbl)); + return ret; +} + diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c new file mode 100644 index 000000000..cae590bd0 --- /dev/null +++ b/drivers/firmware/efi/vars.c @@ -0,0 +1,1222 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Originally from efivars.c + * + * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com> + * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com> + */ + +#include <linux/capability.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/smp.h> +#include <linux/efi.h> +#include <linux/sysfs.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <linux/ctype.h> +#include <linux/ucs2_string.h> + +/* Private pointer to registered efivars */ +static struct efivars *__efivars; + +/* + * efivars_lock protects three things: + * 1) efivarfs_list and efivars_sysfs_list + * 2) ->ops calls + * 3) (un)registration of __efivars + */ +static DEFINE_SEMAPHORE(efivars_lock); + +static bool +validate_device_path(efi_char16_t *var_name, int match, u8 *buffer, + unsigned long len) +{ + struct efi_generic_dev_path *node; + int offset = 0; + + node = (struct efi_generic_dev_path *)buffer; + + if (len < sizeof(*node)) + return false; + + while (offset <= len - sizeof(*node) && + node->length >= sizeof(*node) && + node->length <= len - offset) { + offset += node->length; + + if ((node->type == EFI_DEV_END_PATH || + node->type == EFI_DEV_END_PATH2) && + node->sub_type == EFI_DEV_END_ENTIRE) + return true; + + node = (struct efi_generic_dev_path *)(buffer + offset); + } + + /* + * If we're here then either node->length pointed past the end + * of the buffer or we reached the end of the buffer without + * finding a device path end node. + */ + return false; +} + +static bool +validate_boot_order(efi_char16_t *var_name, int match, u8 *buffer, + unsigned long len) +{ + /* An array of 16-bit integers */ + if ((len % 2) != 0) + return false; + + return true; +} + +static bool +validate_load_option(efi_char16_t *var_name, int match, u8 *buffer, + unsigned long len) +{ + u16 filepathlength; + int i, desclength = 0, namelen; + + namelen = ucs2_strnlen(var_name, EFI_VAR_NAME_LEN); + + /* Either "Boot" or "Driver" followed by four digits of hex */ + for (i = match; i < match+4; i++) { + if (var_name[i] > 127 || + hex_to_bin(var_name[i] & 0xff) < 0) + return true; + } + + /* Reject it if there's 4 digits of hex and then further content */ + if (namelen > match + 4) + return false; + + /* A valid entry must be at least 8 bytes */ + if (len < 8) + return false; + + filepathlength = buffer[4] | buffer[5] << 8; + + /* + * There's no stored length for the description, so it has to be + * found by hand + */ + desclength = ucs2_strsize((efi_char16_t *)(buffer + 6), len - 6) + 2; + + /* Each boot entry must have a descriptor */ + if (!desclength) + return false; + + /* + * If the sum of the length of the description, the claimed filepath + * length and the original header are greater than the length of the + * variable, it's malformed + */ + if ((desclength + filepathlength + 6) > len) + return false; + + /* + * And, finally, check the filepath + */ + return validate_device_path(var_name, match, buffer + desclength + 6, + filepathlength); +} + +static bool +validate_uint16(efi_char16_t *var_name, int match, u8 *buffer, + unsigned long len) +{ + /* A single 16-bit integer */ + if (len != 2) + return false; + + return true; +} + +static bool +validate_ascii_string(efi_char16_t *var_name, int match, u8 *buffer, + unsigned long len) +{ + int i; + + for (i = 0; i < len; i++) { + if (buffer[i] > 127) + return false; + + if (buffer[i] == 0) + return true; + } + + return false; +} + +struct variable_validate { + efi_guid_t vendor; + char *name; + bool (*validate)(efi_char16_t *var_name, int match, u8 *data, + unsigned long len); +}; + +/* + * This is the list of variables we need to validate, as well as the + * whitelist for what we think is safe not to default to immutable. + * + * If it has a validate() method that's not NULL, it'll go into the + * validation routine. If not, it is assumed valid, but still used for + * whitelisting. + * + * Note that it's sorted by {vendor,name}, but globbed names must come after + * any other name with the same prefix. + */ +static const struct variable_validate variable_validate[] = { + { EFI_GLOBAL_VARIABLE_GUID, "BootNext", validate_uint16 }, + { EFI_GLOBAL_VARIABLE_GUID, "BootOrder", validate_boot_order }, + { EFI_GLOBAL_VARIABLE_GUID, "Boot*", validate_load_option }, + { EFI_GLOBAL_VARIABLE_GUID, "DriverOrder", validate_boot_order }, + { EFI_GLOBAL_VARIABLE_GUID, "Driver*", validate_load_option }, + { EFI_GLOBAL_VARIABLE_GUID, "ConIn", validate_device_path }, + { EFI_GLOBAL_VARIABLE_GUID, "ConInDev", validate_device_path }, + { EFI_GLOBAL_VARIABLE_GUID, "ConOut", validate_device_path }, + { EFI_GLOBAL_VARIABLE_GUID, "ConOutDev", validate_device_path }, + { EFI_GLOBAL_VARIABLE_GUID, "ErrOut", validate_device_path }, + { EFI_GLOBAL_VARIABLE_GUID, "ErrOutDev", validate_device_path }, + { EFI_GLOBAL_VARIABLE_GUID, "Lang", validate_ascii_string }, + { EFI_GLOBAL_VARIABLE_GUID, "OsIndications", NULL }, + { EFI_GLOBAL_VARIABLE_GUID, "PlatformLang", validate_ascii_string }, + { EFI_GLOBAL_VARIABLE_GUID, "Timeout", validate_uint16 }, + { LINUX_EFI_CRASH_GUID, "*", NULL }, + { NULL_GUID, "", NULL }, +}; + +/* + * Check if @var_name matches the pattern given in @match_name. + * + * @var_name: an array of @len non-NUL characters. + * @match_name: a NUL-terminated pattern string, optionally ending in "*". A + * final "*" character matches any trailing characters @var_name, + * including the case when there are none left in @var_name. + * @match: on output, the number of non-wildcard characters in @match_name + * that @var_name matches, regardless of the return value. + * @return: whether @var_name fully matches @match_name. + */ +static bool +variable_matches(const char *var_name, size_t len, const char *match_name, + int *match) +{ + for (*match = 0; ; (*match)++) { + char c = match_name[*match]; + + switch (c) { + case '*': + /* Wildcard in @match_name means we've matched. */ + return true; + + case '\0': + /* @match_name has ended. Has @var_name too? */ + return (*match == len); + + default: + /* + * We've reached a non-wildcard char in @match_name. + * Continue only if there's an identical character in + * @var_name. + */ + if (*match < len && c == var_name[*match]) + continue; + return false; + } + } +} + +bool +efivar_validate(efi_guid_t vendor, efi_char16_t *var_name, u8 *data, + unsigned long data_size) +{ + int i; + unsigned long utf8_size; + u8 *utf8_name; + + utf8_size = ucs2_utf8size(var_name); + utf8_name = kmalloc(utf8_size + 1, GFP_KERNEL); + if (!utf8_name) + return false; + + ucs2_as_utf8(utf8_name, var_name, utf8_size); + utf8_name[utf8_size] = '\0'; + + for (i = 0; variable_validate[i].name[0] != '\0'; i++) { + const char *name = variable_validate[i].name; + int match = 0; + + if (efi_guidcmp(vendor, variable_validate[i].vendor)) + continue; + + if (variable_matches(utf8_name, utf8_size+1, name, &match)) { + if (variable_validate[i].validate == NULL) + break; + kfree(utf8_name); + return variable_validate[i].validate(var_name, match, + data, data_size); + } + } + kfree(utf8_name); + return true; +} +EXPORT_SYMBOL_GPL(efivar_validate); + +bool +efivar_variable_is_removable(efi_guid_t vendor, const char *var_name, + size_t len) +{ + int i; + bool found = false; + int match = 0; + + /* + * Check if our variable is in the validated variables list + */ + for (i = 0; variable_validate[i].name[0] != '\0'; i++) { + if (efi_guidcmp(variable_validate[i].vendor, vendor)) + continue; + + if (variable_matches(var_name, len, + variable_validate[i].name, &match)) { + found = true; + break; + } + } + + /* + * If it's in our list, it is removable. + */ + return found; +} +EXPORT_SYMBOL_GPL(efivar_variable_is_removable); + +static efi_status_t +check_var_size(u32 attributes, unsigned long size) +{ + const struct efivar_operations *fops; + + if (!__efivars) + return EFI_UNSUPPORTED; + + fops = __efivars->ops; + + if (!fops->query_variable_store) + return EFI_UNSUPPORTED; + + return fops->query_variable_store(attributes, size, false); +} + +static efi_status_t +check_var_size_nonblocking(u32 attributes, unsigned long size) +{ + const struct efivar_operations *fops; + + if (!__efivars) + return EFI_UNSUPPORTED; + + fops = __efivars->ops; + + if (!fops->query_variable_store) + return EFI_UNSUPPORTED; + + return fops->query_variable_store(attributes, size, true); +} + +static bool variable_is_present(efi_char16_t *variable_name, efi_guid_t *vendor, + struct list_head *head) +{ + struct efivar_entry *entry, *n; + unsigned long strsize1, strsize2; + bool found = false; + + strsize1 = ucs2_strsize(variable_name, 1024); + list_for_each_entry_safe(entry, n, head, list) { + strsize2 = ucs2_strsize(entry->var.VariableName, 1024); + if (strsize1 == strsize2 && + !memcmp(variable_name, &(entry->var.VariableName), + strsize2) && + !efi_guidcmp(entry->var.VendorGuid, + *vendor)) { + found = true; + break; + } + } + return found; +} + +/* + * Returns the size of variable_name, in bytes, including the + * terminating NULL character, or variable_name_size if no NULL + * character is found among the first variable_name_size bytes. + */ +static unsigned long var_name_strnsize(efi_char16_t *variable_name, + unsigned long variable_name_size) +{ + unsigned long len; + efi_char16_t c; + + /* + * The variable name is, by definition, a NULL-terminated + * string, so make absolutely sure that variable_name_size is + * the value we expect it to be. If not, return the real size. + */ + for (len = 2; len <= variable_name_size; len += sizeof(c)) { + c = variable_name[(len / sizeof(c)) - 1]; + if (!c) + break; + } + + return min(len, variable_name_size); +} + +/* + * Print a warning when duplicate EFI variables are encountered and + * disable the sysfs workqueue since the firmware is buggy. + */ +static void dup_variable_bug(efi_char16_t *str16, efi_guid_t *vendor_guid, + unsigned long len16) +{ + size_t i, len8 = len16 / sizeof(efi_char16_t); + char *str8; + + str8 = kzalloc(len8, GFP_KERNEL); + if (!str8) + return; + + for (i = 0; i < len8; i++) + str8[i] = str16[i]; + + printk(KERN_WARNING "efivars: duplicate variable: %s-%pUl\n", + str8, vendor_guid); + kfree(str8); +} + +/** + * efivar_init - build the initial list of EFI variables + * @func: callback function to invoke for every variable + * @data: function-specific data to pass to @func + * @duplicates: error if we encounter duplicates on @head? + * @head: initialised head of variable list + * + * Get every EFI variable from the firmware and invoke @func. @func + * should call efivar_entry_add() to build the list of variables. + * + * Returns 0 on success, or a kernel error code on failure. + */ +int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *), + void *data, bool duplicates, struct list_head *head) +{ + const struct efivar_operations *ops; + unsigned long variable_name_size = 1024; + efi_char16_t *variable_name; + efi_status_t status; + efi_guid_t vendor_guid; + int err = 0; + + if (!__efivars) + return -EFAULT; + + ops = __efivars->ops; + + variable_name = kzalloc(variable_name_size, GFP_KERNEL); + if (!variable_name) { + printk(KERN_ERR "efivars: Memory allocation failed.\n"); + return -ENOMEM; + } + + if (down_interruptible(&efivars_lock)) { + err = -EINTR; + goto free; + } + + /* + * Per EFI spec, the maximum storage allocated for both + * the variable name and variable data is 1024 bytes. + */ + + do { + variable_name_size = 1024; + + status = ops->get_next_variable(&variable_name_size, + variable_name, + &vendor_guid); + switch (status) { + case EFI_SUCCESS: + if (duplicates) + up(&efivars_lock); + + variable_name_size = var_name_strnsize(variable_name, + variable_name_size); + + /* + * Some firmware implementations return the + * same variable name on multiple calls to + * get_next_variable(). Terminate the loop + * immediately as there is no guarantee that + * we'll ever see a different variable name, + * and may end up looping here forever. + */ + if (duplicates && + variable_is_present(variable_name, &vendor_guid, + head)) { + dup_variable_bug(variable_name, &vendor_guid, + variable_name_size); + status = EFI_NOT_FOUND; + } else { + err = func(variable_name, vendor_guid, + variable_name_size, data); + if (err) + status = EFI_NOT_FOUND; + } + + if (duplicates) { + if (down_interruptible(&efivars_lock)) { + err = -EINTR; + goto free; + } + } + + break; + case EFI_UNSUPPORTED: + err = -EOPNOTSUPP; + status = EFI_NOT_FOUND; + break; + case EFI_NOT_FOUND: + break; + default: + printk(KERN_WARNING "efivars: get_next_variable: status=%lx\n", + status); + status = EFI_NOT_FOUND; + break; + } + + } while (status != EFI_NOT_FOUND); + + up(&efivars_lock); +free: + kfree(variable_name); + + return err; +} +EXPORT_SYMBOL_GPL(efivar_init); + +/** + * efivar_entry_add - add entry to variable list + * @entry: entry to add to list + * @head: list head + * + * Returns 0 on success, or a kernel error code on failure. + */ +int efivar_entry_add(struct efivar_entry *entry, struct list_head *head) +{ + if (down_interruptible(&efivars_lock)) + return -EINTR; + list_add(&entry->list, head); + up(&efivars_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(efivar_entry_add); + +/** + * efivar_entry_remove - remove entry from variable list + * @entry: entry to remove from list + * + * Returns 0 on success, or a kernel error code on failure. + */ +int efivar_entry_remove(struct efivar_entry *entry) +{ + if (down_interruptible(&efivars_lock)) + return -EINTR; + list_del(&entry->list); + up(&efivars_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(efivar_entry_remove); + +/* + * efivar_entry_list_del_unlock - remove entry from variable list + * @entry: entry to remove + * + * Remove @entry from the variable list and release the list lock. + * + * NOTE: slightly weird locking semantics here - we expect to be + * called with the efivars lock already held, and we release it before + * returning. This is because this function is usually called after + * set_variable() while the lock is still held. + */ +static void efivar_entry_list_del_unlock(struct efivar_entry *entry) +{ + list_del(&entry->list); + up(&efivars_lock); +} + +/** + * __efivar_entry_delete - delete an EFI variable + * @entry: entry containing EFI variable to delete + * + * Delete the variable from the firmware but leave @entry on the + * variable list. + * + * This function differs from efivar_entry_delete() because it does + * not remove @entry from the variable list. Also, it is safe to be + * called from within a efivar_entry_iter_begin() and + * efivar_entry_iter_end() region, unlike efivar_entry_delete(). + * + * Returns 0 on success, or a converted EFI status code if + * set_variable() fails. + */ +int __efivar_entry_delete(struct efivar_entry *entry) +{ + efi_status_t status; + + if (!__efivars) + return -EINVAL; + + status = __efivars->ops->set_variable(entry->var.VariableName, + &entry->var.VendorGuid, + 0, 0, NULL); + + return efi_status_to_err(status); +} +EXPORT_SYMBOL_GPL(__efivar_entry_delete); + +/** + * efivar_entry_delete - delete variable and remove entry from list + * @entry: entry containing variable to delete + * + * Delete the variable from the firmware and remove @entry from the + * variable list. It is the caller's responsibility to free @entry + * once we return. + * + * Returns 0 on success, -EINTR if we can't grab the semaphore, + * converted EFI status code if set_variable() fails. + */ +int efivar_entry_delete(struct efivar_entry *entry) +{ + const struct efivar_operations *ops; + efi_status_t status; + + if (down_interruptible(&efivars_lock)) + return -EINTR; + + if (!__efivars) { + up(&efivars_lock); + return -EINVAL; + } + ops = __efivars->ops; + status = ops->set_variable(entry->var.VariableName, + &entry->var.VendorGuid, + 0, 0, NULL); + if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) { + up(&efivars_lock); + return efi_status_to_err(status); + } + + efivar_entry_list_del_unlock(entry); + return 0; +} +EXPORT_SYMBOL_GPL(efivar_entry_delete); + +/** + * efivar_entry_set - call set_variable() + * @entry: entry containing the EFI variable to write + * @attributes: variable attributes + * @size: size of @data buffer + * @data: buffer containing variable data + * @head: head of variable list + * + * Calls set_variable() for an EFI variable. If creating a new EFI + * variable, this function is usually followed by efivar_entry_add(). + * + * Before writing the variable, the remaining EFI variable storage + * space is checked to ensure there is enough room available. + * + * If @head is not NULL a lookup is performed to determine whether + * the entry is already on the list. + * + * Returns 0 on success, -EINTR if we can't grab the semaphore, + * -EEXIST if a lookup is performed and the entry already exists on + * the list, or a converted EFI status code if set_variable() fails. + */ +int efivar_entry_set(struct efivar_entry *entry, u32 attributes, + unsigned long size, void *data, struct list_head *head) +{ + const struct efivar_operations *ops; + efi_status_t status; + efi_char16_t *name = entry->var.VariableName; + efi_guid_t vendor = entry->var.VendorGuid; + + if (down_interruptible(&efivars_lock)) + return -EINTR; + + if (!__efivars) { + up(&efivars_lock); + return -EINVAL; + } + ops = __efivars->ops; + if (head && efivar_entry_find(name, vendor, head, false)) { + up(&efivars_lock); + return -EEXIST; + } + + status = check_var_size(attributes, size + ucs2_strsize(name, 1024)); + if (status == EFI_SUCCESS || status == EFI_UNSUPPORTED) + status = ops->set_variable(name, &vendor, + attributes, size, data); + + up(&efivars_lock); + + return efi_status_to_err(status); + +} +EXPORT_SYMBOL_GPL(efivar_entry_set); + +/* + * efivar_entry_set_nonblocking - call set_variable_nonblocking() + * + * This function is guaranteed to not block and is suitable for calling + * from crash/panic handlers. + * + * Crucially, this function will not block if it cannot acquire + * efivars_lock. Instead, it returns -EBUSY. + */ +static int +efivar_entry_set_nonblocking(efi_char16_t *name, efi_guid_t vendor, + u32 attributes, unsigned long size, void *data) +{ + const struct efivar_operations *ops; + efi_status_t status; + + if (down_trylock(&efivars_lock)) + return -EBUSY; + + if (!__efivars) { + up(&efivars_lock); + return -EINVAL; + } + + status = check_var_size_nonblocking(attributes, + size + ucs2_strsize(name, 1024)); + if (status != EFI_SUCCESS) { + up(&efivars_lock); + return -ENOSPC; + } + + ops = __efivars->ops; + status = ops->set_variable_nonblocking(name, &vendor, attributes, + size, data); + + up(&efivars_lock); + return efi_status_to_err(status); +} + +/** + * efivar_entry_set_safe - call set_variable() if enough space in firmware + * @name: buffer containing the variable name + * @vendor: variable vendor guid + * @attributes: variable attributes + * @block: can we block in this context? + * @size: size of @data buffer + * @data: buffer containing variable data + * + * Ensures there is enough free storage in the firmware for this variable, and + * if so, calls set_variable(). If creating a new EFI variable, this function + * is usually followed by efivar_entry_add(). + * + * Returns 0 on success, -ENOSPC if the firmware does not have enough + * space for set_variable() to succeed, or a converted EFI status code + * if set_variable() fails. + */ +int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes, + bool block, unsigned long size, void *data) +{ + const struct efivar_operations *ops; + efi_status_t status; + unsigned long varsize; + + if (!__efivars) + return -EINVAL; + + ops = __efivars->ops; + if (!ops->query_variable_store) + return -ENOSYS; + + /* + * If the EFI variable backend provides a non-blocking + * ->set_variable() operation and we're in a context where we + * cannot block, then we need to use it to avoid live-locks, + * since the implication is that the regular ->set_variable() + * will block. + * + * If no ->set_variable_nonblocking() is provided then + * ->set_variable() is assumed to be non-blocking. + */ + if (!block && ops->set_variable_nonblocking) + return efivar_entry_set_nonblocking(name, vendor, attributes, + size, data); + + varsize = size + ucs2_strsize(name, 1024); + if (!block) { + if (down_trylock(&efivars_lock)) + return -EBUSY; + status = check_var_size_nonblocking(attributes, varsize); + } else { + if (down_interruptible(&efivars_lock)) + return -EINTR; + status = check_var_size(attributes, varsize); + } + + if (status != EFI_SUCCESS) { + up(&efivars_lock); + return -ENOSPC; + } + + status = ops->set_variable(name, &vendor, attributes, size, data); + + up(&efivars_lock); + + return efi_status_to_err(status); +} +EXPORT_SYMBOL_GPL(efivar_entry_set_safe); + +/** + * efivar_entry_find - search for an entry + * @name: the EFI variable name + * @guid: the EFI variable vendor's guid + * @head: head of the variable list + * @remove: should we remove the entry from the list? + * + * Search for an entry on the variable list that has the EFI variable + * name @name and vendor guid @guid. If an entry is found on the list + * and @remove is true, the entry is removed from the list. + * + * The caller MUST call efivar_entry_iter_begin() and + * efivar_entry_iter_end() before and after the invocation of this + * function, respectively. + * + * Returns the entry if found on the list, %NULL otherwise. + */ +struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid, + struct list_head *head, bool remove) +{ + struct efivar_entry *entry, *n; + int strsize1, strsize2; + bool found = false; + + list_for_each_entry_safe(entry, n, head, list) { + strsize1 = ucs2_strsize(name, 1024); + strsize2 = ucs2_strsize(entry->var.VariableName, 1024); + if (strsize1 == strsize2 && + !memcmp(name, &(entry->var.VariableName), strsize1) && + !efi_guidcmp(guid, entry->var.VendorGuid)) { + found = true; + break; + } + } + + if (!found) + return NULL; + + if (remove) { + if (entry->scanning) { + /* + * The entry will be deleted + * after scanning is completed. + */ + entry->deleting = true; + } else + list_del(&entry->list); + } + + return entry; +} +EXPORT_SYMBOL_GPL(efivar_entry_find); + +/** + * efivar_entry_size - obtain the size of a variable + * @entry: entry for this variable + * @size: location to store the variable's size + */ +int efivar_entry_size(struct efivar_entry *entry, unsigned long *size) +{ + const struct efivar_operations *ops; + efi_status_t status; + + *size = 0; + + if (down_interruptible(&efivars_lock)) + return -EINTR; + if (!__efivars) { + up(&efivars_lock); + return -EINVAL; + } + ops = __efivars->ops; + status = ops->get_variable(entry->var.VariableName, + &entry->var.VendorGuid, NULL, size, NULL); + up(&efivars_lock); + + if (status != EFI_BUFFER_TOO_SMALL) + return efi_status_to_err(status); + + return 0; +} +EXPORT_SYMBOL_GPL(efivar_entry_size); + +/** + * __efivar_entry_get - call get_variable() + * @entry: read data for this variable + * @attributes: variable attributes + * @size: size of @data buffer + * @data: buffer to store variable data + * + * The caller MUST call efivar_entry_iter_begin() and + * efivar_entry_iter_end() before and after the invocation of this + * function, respectively. + */ +int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes, + unsigned long *size, void *data) +{ + efi_status_t status; + + if (!__efivars) + return -EINVAL; + + status = __efivars->ops->get_variable(entry->var.VariableName, + &entry->var.VendorGuid, + attributes, size, data); + + return efi_status_to_err(status); +} +EXPORT_SYMBOL_GPL(__efivar_entry_get); + +/** + * efivar_entry_get - call get_variable() + * @entry: read data for this variable + * @attributes: variable attributes + * @size: size of @data buffer + * @data: buffer to store variable data + */ +int efivar_entry_get(struct efivar_entry *entry, u32 *attributes, + unsigned long *size, void *data) +{ + efi_status_t status; + + if (down_interruptible(&efivars_lock)) + return -EINTR; + + if (!__efivars) { + up(&efivars_lock); + return -EINVAL; + } + + status = __efivars->ops->get_variable(entry->var.VariableName, + &entry->var.VendorGuid, + attributes, size, data); + up(&efivars_lock); + + return efi_status_to_err(status); +} +EXPORT_SYMBOL_GPL(efivar_entry_get); + +/** + * efivar_entry_set_get_size - call set_variable() and get new size (atomic) + * @entry: entry containing variable to set and get + * @attributes: attributes of variable to be written + * @size: size of data buffer + * @data: buffer containing data to write + * @set: did the set_variable() call succeed? + * + * This is a pretty special (complex) function. See efivarfs_file_write(). + * + * Atomically call set_variable() for @entry and if the call is + * successful, return the new size of the variable from get_variable() + * in @size. The success of set_variable() is indicated by @set. + * + * Returns 0 on success, -EINVAL if the variable data is invalid, + * -ENOSPC if the firmware does not have enough available space, or a + * converted EFI status code if either of set_variable() or + * get_variable() fail. + * + * If the EFI variable does not exist when calling set_variable() + * (EFI_NOT_FOUND), @entry is removed from the variable list. + */ +int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes, + unsigned long *size, void *data, bool *set) +{ + const struct efivar_operations *ops; + efi_char16_t *name = entry->var.VariableName; + efi_guid_t *vendor = &entry->var.VendorGuid; + efi_status_t status; + int err; + + *set = false; + + if (efivar_validate(*vendor, name, data, *size) == false) + return -EINVAL; + + /* + * The lock here protects the get_variable call, the conditional + * set_variable call, and removal of the variable from the efivars + * list (in the case of an authenticated delete). + */ + if (down_interruptible(&efivars_lock)) + return -EINTR; + + if (!__efivars) { + err = -EINVAL; + goto out; + } + + /* + * Ensure that the available space hasn't shrunk below the safe level + */ + status = check_var_size(attributes, *size + ucs2_strsize(name, 1024)); + if (status != EFI_SUCCESS) { + if (status != EFI_UNSUPPORTED) { + err = efi_status_to_err(status); + goto out; + } + + if (*size > 65536) { + err = -ENOSPC; + goto out; + } + } + + ops = __efivars->ops; + + status = ops->set_variable(name, vendor, attributes, *size, data); + if (status != EFI_SUCCESS) { + err = efi_status_to_err(status); + goto out; + } + + *set = true; + + /* + * Writing to the variable may have caused a change in size (which + * could either be an append or an overwrite), or the variable to be + * deleted. Perform a GetVariable() so we can tell what actually + * happened. + */ + *size = 0; + status = ops->get_variable(entry->var.VariableName, + &entry->var.VendorGuid, + NULL, size, NULL); + + if (status == EFI_NOT_FOUND) + efivar_entry_list_del_unlock(entry); + else + up(&efivars_lock); + + if (status && status != EFI_BUFFER_TOO_SMALL) + return efi_status_to_err(status); + + return 0; + +out: + up(&efivars_lock); + return err; + +} +EXPORT_SYMBOL_GPL(efivar_entry_set_get_size); + +/** + * efivar_entry_iter_begin - begin iterating the variable list + * + * Lock the variable list to prevent entry insertion and removal until + * efivar_entry_iter_end() is called. This function is usually used in + * conjunction with __efivar_entry_iter() or efivar_entry_iter(). + */ +int efivar_entry_iter_begin(void) +{ + return down_interruptible(&efivars_lock); +} +EXPORT_SYMBOL_GPL(efivar_entry_iter_begin); + +/** + * efivar_entry_iter_end - finish iterating the variable list + * + * Unlock the variable list and allow modifications to the list again. + */ +void efivar_entry_iter_end(void) +{ + up(&efivars_lock); +} +EXPORT_SYMBOL_GPL(efivar_entry_iter_end); + +/** + * __efivar_entry_iter - iterate over variable list + * @func: callback function + * @head: head of the variable list + * @data: function-specific data to pass to callback + * @prev: entry to begin iterating from + * + * Iterate over the list of EFI variables and call @func with every + * entry on the list. It is safe for @func to remove entries in the + * list via efivar_entry_delete(). + * + * You MUST call efivar_entry_iter_begin() before this function, and + * efivar_entry_iter_end() afterwards. + * + * It is possible to begin iteration from an arbitrary entry within + * the list by passing @prev. @prev is updated on return to point to + * the last entry passed to @func. To begin iterating from the + * beginning of the list @prev must be %NULL. + * + * The restrictions for @func are the same as documented for + * efivar_entry_iter(). + */ +int __efivar_entry_iter(int (*func)(struct efivar_entry *, void *), + struct list_head *head, void *data, + struct efivar_entry **prev) +{ + struct efivar_entry *entry, *n; + int err = 0; + + if (!prev || !*prev) { + list_for_each_entry_safe(entry, n, head, list) { + err = func(entry, data); + if (err) + break; + } + + if (prev) + *prev = entry; + + return err; + } + + + list_for_each_entry_safe_continue((*prev), n, head, list) { + err = func(*prev, data); + if (err) + break; + } + + return err; +} +EXPORT_SYMBOL_GPL(__efivar_entry_iter); + +/** + * efivar_entry_iter - iterate over variable list + * @func: callback function + * @head: head of variable list + * @data: function-specific data to pass to callback + * + * Iterate over the list of EFI variables and call @func with every + * entry on the list. It is safe for @func to remove entries in the + * list via efivar_entry_delete() while iterating. + * + * Some notes for the callback function: + * - a non-zero return value indicates an error and terminates the loop + * - @func is called from atomic context + */ +int efivar_entry_iter(int (*func)(struct efivar_entry *, void *), + struct list_head *head, void *data) +{ + int err = 0; + + err = efivar_entry_iter_begin(); + if (err) + return err; + err = __efivar_entry_iter(func, head, data, NULL); + efivar_entry_iter_end(); + + return err; +} +EXPORT_SYMBOL_GPL(efivar_entry_iter); + +/** + * efivars_kobject - get the kobject for the registered efivars + * + * If efivars_register() has not been called we return NULL, + * otherwise return the kobject used at registration time. + */ +struct kobject *efivars_kobject(void) +{ + if (!__efivars) + return NULL; + + return __efivars->kobject; +} +EXPORT_SYMBOL_GPL(efivars_kobject); + +/** + * efivars_register - register an efivars + * @efivars: efivars to register + * @ops: efivars operations + * @kobject: @efivars-specific kobject + * + * Only a single efivars can be registered at any time. + */ +int efivars_register(struct efivars *efivars, + const struct efivar_operations *ops, + struct kobject *kobject) +{ + if (down_interruptible(&efivars_lock)) + return -EINTR; + + efivars->ops = ops; + efivars->kobject = kobject; + + __efivars = efivars; + + pr_info("Registered efivars operations\n"); + + up(&efivars_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(efivars_register); + +/** + * efivars_unregister - unregister an efivars + * @efivars: efivars to unregister + * + * The caller must have already removed every entry from the list, + * failure to do so is an error. + */ +int efivars_unregister(struct efivars *efivars) +{ + int rv; + + if (down_interruptible(&efivars_lock)) + return -EINTR; + + if (!__efivars) { + printk(KERN_ERR "efivars not registered\n"); + rv = -EINVAL; + goto out; + } + + if (__efivars != efivars) { + rv = -EINVAL; + goto out; + } + + pr_info("Unregistered efivars operations\n"); + __efivars = NULL; + + rv = 0; +out: + up(&efivars_lock); + return rv; +} +EXPORT_SYMBOL_GPL(efivars_unregister); + +int efivar_supports_writes(void) +{ + return __efivars && __efivars->ops->set_variable; +} +EXPORT_SYMBOL_GPL(efivar_supports_writes); diff --git a/drivers/firmware/efi/x86_fake_mem.c b/drivers/firmware/efi/x86_fake_mem.c new file mode 100644 index 000000000..0bafcc1bb --- /dev/null +++ b/drivers/firmware/efi/x86_fake_mem.c @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright(c) 2019 Intel Corporation. All rights reserved. */ +#include <linux/efi.h> +#include <asm/e820/api.h> +#include "fake_mem.h" + +void __init efi_fake_memmap_early(void) +{ + int i; + + /* + * The late efi_fake_mem() call can handle all requests if + * EFI_MEMORY_SP support is disabled. + */ + if (!efi_soft_reserve_enabled()) + return; + + if (!efi_enabled(EFI_MEMMAP) || !nr_fake_mem) + return; + + /* + * Given that efi_fake_memmap() needs to perform memblock + * allocations it needs to run after e820__memblock_setup(). + * However, if efi_fake_mem specifies EFI_MEMORY_SP for a given + * address range that potentially needs to mark the memory as + * reserved prior to e820__memblock_setup(). Update e820 + * directly if EFI_MEMORY_SP is specified for an + * EFI_CONVENTIONAL_MEMORY descriptor. + */ + for (i = 0; i < nr_fake_mem; i++) { + struct efi_mem_range *mem = &efi_fake_mems[i]; + efi_memory_desc_t *md; + u64 m_start, m_end; + + if ((mem->attribute & EFI_MEMORY_SP) == 0) + continue; + + m_start = mem->range.start; + m_end = mem->range.end; + for_each_efi_memory_desc(md) { + u64 start, end, size; + + if (md->type != EFI_CONVENTIONAL_MEMORY) + continue; + + start = md->phys_addr; + end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1; + + if (m_start <= end && m_end >= start) + /* fake range overlaps descriptor */; + else + continue; + + /* + * Trim the boundary of the e820 update to the + * descriptor in case the fake range overlaps + * !EFI_CONVENTIONAL_MEMORY + */ + start = max(start, m_start); + end = min(end, m_end); + size = end - start + 1; + + if (end <= start) + continue; + + /* + * Ensure each efi_fake_mem instance results in + * a unique e820 resource + */ + e820__range_remove(start, size, E820_TYPE_RAM, 1); + e820__range_add(start, size, E820_TYPE_SOFT_RESERVED); + e820__update_table(e820_table); + } + } +} |