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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/xen/efi.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/xen/efi.c')
-rw-r--r--drivers/xen/efi.c355
1 files changed, 355 insertions, 0 deletions
diff --git a/drivers/xen/efi.c b/drivers/xen/efi.c
new file mode 100644
index 0000000000..fb321cd641
--- /dev/null
+++ b/drivers/xen/efi.c
@@ -0,0 +1,355 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * EFI support for Xen.
+ *
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999-2002 Hewlett-Packard Co.
+ * David Mosberger-Tang <davidm@hpl.hp.com>
+ * Stephane Eranian <eranian@hpl.hp.com>
+ * Copyright (C) 2005-2008 Intel Co.
+ * Fenghua Yu <fenghua.yu@intel.com>
+ * Bibo Mao <bibo.mao@intel.com>
+ * Chandramouli Narayanan <mouli@linux.intel.com>
+ * Huang Ying <ying.huang@intel.com>
+ * Copyright (C) 2011 Novell Co.
+ * Jan Beulich <JBeulich@suse.com>
+ * Copyright (C) 2011-2012 Oracle Co.
+ * Liang Tang <liang.tang@oracle.com>
+ * Copyright (c) 2014 Oracle Co., Daniel Kiper
+ */
+
+#include <linux/bug.h>
+#include <linux/efi.h>
+#include <linux/init.h>
+#include <linux/string.h>
+
+#include <xen/interface/xen.h>
+#include <xen/interface/platform.h>
+#include <xen/page.h>
+#include <xen/xen.h>
+#include <xen/xen-ops.h>
+
+#include <asm/page.h>
+
+#include <asm/xen/hypercall.h>
+
+#define INIT_EFI_OP(name) \
+ {.cmd = XENPF_efi_runtime_call, \
+ .u.efi_runtime_call.function = XEN_EFI_##name, \
+ .u.efi_runtime_call.misc = 0}
+
+#define efi_data(op) (op.u.efi_runtime_call)
+
+static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
+{
+ struct xen_platform_op op = INIT_EFI_OP(get_time);
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ if (tm) {
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
+ memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
+ }
+
+ if (tc) {
+ tc->resolution = efi_data(op).u.get_time.resolution;
+ tc->accuracy = efi_data(op).u.get_time.accuracy;
+ tc->sets_to_zero = !!(efi_data(op).misc &
+ XEN_EFI_GET_TIME_SET_CLEARS_NS);
+ }
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_set_time(efi_time_t *tm)
+{
+ struct xen_platform_op op = INIT_EFI_OP(set_time);
+
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
+ memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
+ efi_bool_t *pending,
+ efi_time_t *tm)
+{
+ struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ if (tm) {
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
+ memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
+ }
+
+ if (enabled)
+ *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
+
+ if (pending)
+ *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
+{
+ struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
+
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
+ if (enabled)
+ efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
+ if (tm)
+ memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
+ else
+ efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor,
+ u32 *attr, unsigned long *data_size,
+ void *data)
+{
+ struct xen_platform_op op = INIT_EFI_OP(get_variable);
+
+ set_xen_guest_handle(efi_data(op).u.get_variable.name, name);
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(efi_data(op).u.get_variable.vendor_guid));
+ memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor));
+ efi_data(op).u.get_variable.size = *data_size;
+ set_xen_guest_handle(efi_data(op).u.get_variable.data, data);
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ *data_size = efi_data(op).u.get_variable.size;
+ if (attr)
+ *attr = efi_data(op).misc;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
+ efi_char16_t *name,
+ efi_guid_t *vendor)
+{
+ struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
+
+ efi_data(op).u.get_next_variable_name.size = *name_size;
+ set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
+ memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
+ sizeof(*vendor));
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ *name_size = efi_data(op).u.get_next_variable_name.size;
+ memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
+ sizeof(*vendor));
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,
+ u32 attr, unsigned long data_size,
+ void *data)
+{
+ struct xen_platform_op op = INIT_EFI_OP(set_variable);
+
+ set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
+ efi_data(op).misc = attr;
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(efi_data(op).u.set_variable.vendor_guid));
+ memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
+ efi_data(op).u.set_variable.size = data_size;
+ set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
+ u64 *remaining_space,
+ u64 *max_variable_size)
+{
+ struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ efi_data(op).u.query_variable_info.attr = attr;
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ *storage_space = efi_data(op).u.query_variable_info.max_store_size;
+ *remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
+ *max_variable_size = efi_data(op).u.query_variable_info.max_size;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
+{
+ struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ *count = efi_data(op).misc;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
+ unsigned long count, unsigned long sg_list)
+{
+ struct xen_platform_op op = INIT_EFI_OP(update_capsule);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
+ capsules);
+ efi_data(op).u.update_capsule.capsule_count = count;
+ efi_data(op).u.update_capsule.sg_list = sg_list;
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ return efi_data(op).status;
+}
+
+static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
+ unsigned long count, u64 *max_size, int *reset_type)
+{
+ struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
+ capsules);
+ efi_data(op).u.query_capsule_capabilities.capsule_count = count;
+
+ if (HYPERVISOR_platform_op(&op) < 0)
+ return EFI_UNSUPPORTED;
+
+ *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
+ *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
+
+ return efi_data(op).status;
+}
+
+static void xen_efi_reset_system(int reset_type, efi_status_t status,
+ unsigned long data_size, efi_char16_t *data)
+{
+ switch (reset_type) {
+ case EFI_RESET_COLD:
+ case EFI_RESET_WARM:
+ xen_reboot(SHUTDOWN_reboot);
+ break;
+ case EFI_RESET_SHUTDOWN:
+ xen_reboot(SHUTDOWN_poweroff);
+ break;
+ default:
+ BUG();
+ }
+}
+
+/*
+ * Set XEN EFI runtime services function pointers. Other fields of struct efi,
+ * e.g. efi.systab, will be set like normal EFI.
+ */
+void __init xen_efi_runtime_setup(void)
+{
+ efi.get_time = xen_efi_get_time;
+ efi.set_time = xen_efi_set_time;
+ efi.get_wakeup_time = xen_efi_get_wakeup_time;
+ efi.set_wakeup_time = xen_efi_set_wakeup_time;
+ efi.get_variable = xen_efi_get_variable;
+ efi.get_next_variable = xen_efi_get_next_variable;
+ efi.set_variable = xen_efi_set_variable;
+ efi.set_variable_nonblocking = xen_efi_set_variable;
+ efi.query_variable_info = xen_efi_query_variable_info;
+ efi.query_variable_info_nonblocking = xen_efi_query_variable_info;
+ efi.update_capsule = xen_efi_update_capsule;
+ efi.query_capsule_caps = xen_efi_query_capsule_caps;
+ efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
+ efi.reset_system = xen_efi_reset_system;
+}
+
+int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)
+{
+ static_assert(XEN_PAGE_SHIFT == EFI_PAGE_SHIFT,
+ "Mismatch between EFI_PAGE_SHIFT and XEN_PAGE_SHIFT");
+ struct xen_platform_op op;
+ union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
+ int rc;
+
+ if (!efi_enabled(EFI_PARAVIRT) || efi_enabled(EFI_MEMMAP))
+ return __efi_mem_desc_lookup(phys_addr, out_md);
+ phys_addr &= ~(u64)(EFI_PAGE_SIZE - 1);
+ op = (struct xen_platform_op) {
+ .cmd = XENPF_firmware_info,
+ .u.firmware_info = {
+ .type = XEN_FW_EFI_INFO,
+ .index = XEN_FW_EFI_MEM_INFO,
+ .u.efi_info.mem.addr = phys_addr,
+ .u.efi_info.mem.size = U64_MAX - phys_addr,
+ },
+ };
+
+ rc = HYPERVISOR_platform_op(&op);
+ if (rc) {
+ pr_warn("Failed to lookup header 0x%llx in Xen memory map: error %d\n",
+ phys_addr, rc);
+ }
+
+ out_md->phys_addr = info->mem.addr;
+ out_md->num_pages = info->mem.size >> EFI_PAGE_SHIFT;
+ out_md->type = info->mem.type;
+ out_md->attribute = info->mem.attr;
+
+ return 0;
+}
+
+bool __init xen_efi_config_table_is_usable(const efi_guid_t *guid,
+ unsigned long table)
+{
+ efi_memory_desc_t md;
+ int rc;
+
+ if (!efi_enabled(EFI_PARAVIRT))
+ return true;
+
+ rc = efi_mem_desc_lookup(table, &md);
+ if (rc)
+ return false;
+
+ switch (md.type) {
+ case EFI_RUNTIME_SERVICES_CODE:
+ case EFI_RUNTIME_SERVICES_DATA:
+ case EFI_ACPI_RECLAIM_MEMORY:
+ case EFI_ACPI_MEMORY_NVS:
+ case EFI_RESERVED_TYPE:
+ return true;
+ default:
+ return false;
+ }
+}