diff options
Diffstat (limited to 'arch/s390/kernel/setup.c')
| -rw-r--r-- | arch/s390/kernel/setup.c | 1078 |
1 files changed, 1078 insertions, 0 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c new file mode 100644 index 000000000..2ec5f1e03 --- /dev/null +++ b/arch/s390/kernel/setup.c @@ -0,0 +1,1078 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * S390 version + * Copyright IBM Corp. 1999, 2012 + * Author(s): Hartmut Penner (hp@de.ibm.com), + * Martin Schwidefsky (schwidefsky@de.ibm.com) + * + * Derived from "arch/i386/kernel/setup.c" + * Copyright (C) 1995, Linus Torvalds + */ + +/* + * This file handles the architecture-dependent parts of initialization + */ + +#define KMSG_COMPONENT "setup" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include <linux/errno.h> +#include <linux/export.h> +#include <linux/sched.h> +#include <linux/sched/task.h> +#include <linux/cpu.h> +#include <linux/kernel.h> +#include <linux/memblock.h> +#include <linux/mm.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/random.h> +#include <linux/user.h> +#include <linux/tty.h> +#include <linux/ioport.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/initrd.h> +#include <linux/root_dev.h> +#include <linux/console.h> +#include <linux/kernel_stat.h> +#include <linux/dma-map-ops.h> +#include <linux/device.h> +#include <linux/notifier.h> +#include <linux/pfn.h> +#include <linux/ctype.h> +#include <linux/reboot.h> +#include <linux/topology.h> +#include <linux/kexec.h> +#include <linux/crash_dump.h> +#include <linux/memory.h> +#include <linux/compat.h> +#include <linux/start_kernel.h> +#include <linux/hugetlb.h> +#include <linux/kmemleak.h> + +#include <asm/boot_data.h> +#include <asm/ipl.h> +#include <asm/facility.h> +#include <asm/smp.h> +#include <asm/mmu_context.h> +#include <asm/cpcmd.h> +#include <asm/abs_lowcore.h> +#include <asm/nmi.h> +#include <asm/irq.h> +#include <asm/page.h> +#include <asm/ptrace.h> +#include <asm/sections.h> +#include <asm/ebcdic.h> +#include <asm/diag.h> +#include <asm/os_info.h> +#include <asm/sclp.h> +#include <asm/stacktrace.h> +#include <asm/sysinfo.h> +#include <asm/numa.h> +#include <asm/alternative.h> +#include <asm/nospec-branch.h> +#include <asm/mem_detect.h> +#include <asm/maccess.h> +#include <asm/uv.h> +#include <asm/asm-offsets.h> +#include "entry.h" + +/* + * Machine setup.. + */ +unsigned int console_mode = 0; +EXPORT_SYMBOL(console_mode); + +unsigned int console_devno = -1; +EXPORT_SYMBOL(console_devno); + +unsigned int console_irq = -1; +EXPORT_SYMBOL(console_irq); + +/* + * Some code and data needs to stay below 2 GB, even when the kernel would be + * relocated above 2 GB, because it has to use 31 bit addresses. + * Such code and data is part of the .amode31 section. + */ +unsigned long __amode31_ref __samode31 = (unsigned long)&_samode31; +unsigned long __amode31_ref __eamode31 = (unsigned long)&_eamode31; +unsigned long __amode31_ref __stext_amode31 = (unsigned long)&_stext_amode31; +unsigned long __amode31_ref __etext_amode31 = (unsigned long)&_etext_amode31; +struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table; +struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table; + +/* + * Control registers CR2, CR5 and CR15 are initialized with addresses + * of tables that must be placed below 2G which is handled by the AMODE31 + * sections. + * Because the AMODE31 sections are relocated below 2G at startup, + * the content of control registers CR2, CR5 and CR15 must be updated + * with new addresses after the relocation. The initial initialization of + * control registers occurs in head64.S and then gets updated again after AMODE31 + * relocation. We must access the relevant AMODE31 tables indirectly via + * pointers placed in the .amode31.refs linker section. Those pointers get + * updated automatically during AMODE31 relocation and always contain a valid + * address within AMODE31 sections. + */ + +static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64); + +static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = { + [1] = 0xffffffffffffffff +}; + +static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = { + 0x80000000, 0, 0, 0, + 0x80000000, 0, 0, 0, + 0x80000000, 0, 0, 0, + 0x80000000, 0, 0, 0, + 0x80000000, 0, 0, 0, + 0x80000000, 0, 0, 0, + 0x80000000, 0, 0, 0, + 0x80000000, 0, 0, 0 +}; + +static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = { + 0, 0, 0x89000000, 0, + 0, 0, 0x8a000000, 0 +}; + +static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31; +static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31; +static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31; +static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31; + +int __bootdata(noexec_disabled); +unsigned long __bootdata(ident_map_size); +struct mem_detect_info __bootdata(mem_detect); +struct initrd_data __bootdata(initrd_data); + +unsigned long __bootdata_preserved(__kaslr_offset); +unsigned long __bootdata(__amode31_base); +unsigned int __bootdata_preserved(zlib_dfltcc_support); +EXPORT_SYMBOL(zlib_dfltcc_support); +u64 __bootdata_preserved(stfle_fac_list[16]); +EXPORT_SYMBOL(stfle_fac_list); +u64 __bootdata_preserved(alt_stfle_fac_list[16]); +struct oldmem_data __bootdata_preserved(oldmem_data); + +unsigned long VMALLOC_START; +EXPORT_SYMBOL(VMALLOC_START); + +unsigned long VMALLOC_END; +EXPORT_SYMBOL(VMALLOC_END); + +struct page *vmemmap; +EXPORT_SYMBOL(vmemmap); +unsigned long vmemmap_size; + +unsigned long MODULES_VADDR; +unsigned long MODULES_END; + +/* An array with a pointer to the lowcore of every CPU. */ +struct lowcore *lowcore_ptr[NR_CPUS]; +EXPORT_SYMBOL(lowcore_ptr); + +DEFINE_STATIC_KEY_FALSE(cpu_has_bear); + +/* + * The Write Back bit position in the physaddr is given by the SLPC PCI. + * Leaving the mask zero always uses write through which is safe + */ +unsigned long mio_wb_bit_mask __ro_after_init; + +/* + * This is set up by the setup-routine at boot-time + * for S390 need to find out, what we have to setup + * using address 0x10400 ... + */ + +#include <asm/setup.h> + +/* + * condev= and conmode= setup parameter. + */ + +static int __init condev_setup(char *str) +{ + int vdev; + + vdev = simple_strtoul(str, &str, 0); + if (vdev >= 0 && vdev < 65536) { + console_devno = vdev; + console_irq = -1; + } + return 1; +} + +__setup("condev=", condev_setup); + +static void __init set_preferred_console(void) +{ + if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) + add_preferred_console("ttyS", 0, NULL); + else if (CONSOLE_IS_3270) + add_preferred_console("tty3270", 0, NULL); + else if (CONSOLE_IS_VT220) + add_preferred_console("ttysclp", 0, NULL); + else if (CONSOLE_IS_HVC) + add_preferred_console("hvc", 0, NULL); +} + +static int __init conmode_setup(char *str) +{ +#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) + if (!strcmp(str, "hwc") || !strcmp(str, "sclp")) + SET_CONSOLE_SCLP; +#endif +#if defined(CONFIG_TN3215_CONSOLE) + if (!strcmp(str, "3215")) + SET_CONSOLE_3215; +#endif +#if defined(CONFIG_TN3270_CONSOLE) + if (!strcmp(str, "3270")) + SET_CONSOLE_3270; +#endif + set_preferred_console(); + return 1; +} + +__setup("conmode=", conmode_setup); + +static void __init conmode_default(void) +{ + char query_buffer[1024]; + char *ptr; + + if (MACHINE_IS_VM) { + cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); + console_devno = simple_strtoul(query_buffer + 5, NULL, 16); + ptr = strstr(query_buffer, "SUBCHANNEL ="); + console_irq = simple_strtoul(ptr + 13, NULL, 16); + cpcmd("QUERY TERM", query_buffer, 1024, NULL); + ptr = strstr(query_buffer, "CONMODE"); + /* + * Set the conmode to 3215 so that the device recognition + * will set the cu_type of the console to 3215. If the + * conmode is 3270 and we don't set it back then both + * 3215 and the 3270 driver will try to access the console + * device (3215 as console and 3270 as normal tty). + */ + cpcmd("TERM CONMODE 3215", NULL, 0, NULL); + if (ptr == NULL) { +#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) + SET_CONSOLE_SCLP; +#endif + return; + } + if (str_has_prefix(ptr + 8, "3270")) { +#if defined(CONFIG_TN3270_CONSOLE) + SET_CONSOLE_3270; +#elif defined(CONFIG_TN3215_CONSOLE) + SET_CONSOLE_3215; +#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) + SET_CONSOLE_SCLP; +#endif + } else if (str_has_prefix(ptr + 8, "3215")) { +#if defined(CONFIG_TN3215_CONSOLE) + SET_CONSOLE_3215; +#elif defined(CONFIG_TN3270_CONSOLE) + SET_CONSOLE_3270; +#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) + SET_CONSOLE_SCLP; +#endif + } + } else if (MACHINE_IS_KVM) { + if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) + SET_CONSOLE_VT220; + else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) + SET_CONSOLE_SCLP; + else + SET_CONSOLE_HVC; + } else { +#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) + SET_CONSOLE_SCLP; +#endif + } +} + +#ifdef CONFIG_CRASH_DUMP +static void __init setup_zfcpdump(void) +{ + if (!is_ipl_type_dump()) + return; + if (oldmem_data.start) + return; + strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); + console_loglevel = 2; +} +#else +static inline void setup_zfcpdump(void) {} +#endif /* CONFIG_CRASH_DUMP */ + + /* + * Reboot, halt and power_off stubs. They just call _machine_restart, + * _machine_halt or _machine_power_off. + */ + +void machine_restart(char *command) +{ + if ((!in_interrupt() && !in_atomic()) || oops_in_progress) + /* + * Only unblank the console if we are called in enabled + * context or a bust_spinlocks cleared the way for us. + */ + console_unblank(); + _machine_restart(command); +} + +void machine_halt(void) +{ + if (!in_interrupt() || oops_in_progress) + /* + * Only unblank the console if we are called in enabled + * context or a bust_spinlocks cleared the way for us. + */ + console_unblank(); + _machine_halt(); +} + +void machine_power_off(void) +{ + if (!in_interrupt() || oops_in_progress) + /* + * Only unblank the console if we are called in enabled + * context or a bust_spinlocks cleared the way for us. + */ + console_unblank(); + _machine_power_off(); +} + +/* + * Dummy power off function. + */ +void (*pm_power_off)(void) = machine_power_off; +EXPORT_SYMBOL_GPL(pm_power_off); + +void *restart_stack; + +unsigned long stack_alloc(void) +{ +#ifdef CONFIG_VMAP_STACK + void *ret; + + ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP, + NUMA_NO_NODE, __builtin_return_address(0)); + kmemleak_not_leak(ret); + return (unsigned long)ret; +#else + return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); +#endif +} + +void stack_free(unsigned long stack) +{ +#ifdef CONFIG_VMAP_STACK + vfree((void *) stack); +#else + free_pages(stack, THREAD_SIZE_ORDER); +#endif +} + +int __init arch_early_irq_init(void) +{ + unsigned long stack; + + stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); + if (!stack) + panic("Couldn't allocate async stack"); + S390_lowcore.async_stack = stack + STACK_INIT_OFFSET; + return 0; +} + +void __init arch_call_rest_init(void) +{ + unsigned long stack; + + smp_reinit_ipl_cpu(); + stack = stack_alloc(); + if (!stack) + panic("Couldn't allocate kernel stack"); + current->stack = (void *) stack; +#ifdef CONFIG_VMAP_STACK + current->stack_vm_area = (void *) stack; +#endif + set_task_stack_end_magic(current); + stack += STACK_INIT_OFFSET; + S390_lowcore.kernel_stack = stack; + call_on_stack_noreturn(rest_init, stack); +} + +static void __init setup_lowcore_dat_off(void) +{ + unsigned long int_psw_mask = PSW_KERNEL_BITS; + struct lowcore *abs_lc, *lc; + unsigned long mcck_stack; + unsigned long flags; + + if (IS_ENABLED(CONFIG_KASAN)) + int_psw_mask |= PSW_MASK_DAT; + + /* + * Setup lowcore for boot cpu + */ + BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); + lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); + if (!lc) + panic("%s: Failed to allocate %zu bytes align=%zx\n", + __func__, sizeof(*lc), sizeof(*lc)); + + lc->restart_psw.mask = PSW_KERNEL_BITS; + lc->restart_psw.addr = (unsigned long) restart_int_handler; + lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; + lc->external_new_psw.addr = (unsigned long) ext_int_handler; + lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; + lc->svc_new_psw.addr = (unsigned long) system_call; + lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; + lc->program_new_psw.addr = (unsigned long) pgm_check_handler; + lc->mcck_new_psw.mask = PSW_KERNEL_BITS; + lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; + lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; + lc->io_new_psw.addr = (unsigned long) io_int_handler; + lc->clock_comparator = clock_comparator_max; + lc->nodat_stack = ((unsigned long) &init_thread_union) + + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); + lc->current_task = (unsigned long)&init_task; + lc->lpp = LPP_MAGIC; + lc->machine_flags = S390_lowcore.machine_flags; + lc->preempt_count = S390_lowcore.preempt_count; + nmi_alloc_mcesa_early(&lc->mcesad); + lc->sys_enter_timer = S390_lowcore.sys_enter_timer; + lc->exit_timer = S390_lowcore.exit_timer; + lc->user_timer = S390_lowcore.user_timer; + lc->system_timer = S390_lowcore.system_timer; + lc->steal_timer = S390_lowcore.steal_timer; + lc->last_update_timer = S390_lowcore.last_update_timer; + lc->last_update_clock = S390_lowcore.last_update_clock; + + /* + * Allocate the global restart stack which is the same for + * all CPUs in cast *one* of them does a PSW restart. + */ + restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); + if (!restart_stack) + panic("%s: Failed to allocate %lu bytes align=0x%lx\n", + __func__, THREAD_SIZE, THREAD_SIZE); + restart_stack += STACK_INIT_OFFSET; + + /* + * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant + * restart data to the absolute zero lowcore. This is necessary if + * PSW restart is done on an offline CPU that has lowcore zero. + */ + lc->restart_stack = (unsigned long) restart_stack; + lc->restart_fn = (unsigned long) do_restart; + lc->restart_data = 0; + lc->restart_source = -1U; + + abs_lc = get_abs_lowcore(&flags); + abs_lc->restart_stack = lc->restart_stack; + abs_lc->restart_fn = lc->restart_fn; + abs_lc->restart_data = lc->restart_data; + abs_lc->restart_source = lc->restart_source; + abs_lc->restart_psw = lc->restart_psw; + abs_lc->mcesad = lc->mcesad; + put_abs_lowcore(abs_lc, flags); + + mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE); + if (!mcck_stack) + panic("%s: Failed to allocate %lu bytes align=0x%lx\n", + __func__, THREAD_SIZE, THREAD_SIZE); + lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET; + + lc->spinlock_lockval = arch_spin_lockval(0); + lc->spinlock_index = 0; + arch_spin_lock_setup(0); + lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); + lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); + lc->preempt_count = PREEMPT_DISABLED; + + set_prefix(__pa(lc)); + lowcore_ptr[0] = lc; +} + +static void __init setup_lowcore_dat_on(void) +{ + struct lowcore *abs_lc; + unsigned long flags; + int i; + + __ctl_clear_bit(0, 28); + S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; + S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; + S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; + S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; + __ctl_set_bit(0, 28); + __ctl_store(S390_lowcore.cregs_save_area, 0, 15); + if (abs_lowcore_map(0, lowcore_ptr[0], true)) + panic("Couldn't setup absolute lowcore"); + abs_lowcore_mapped = true; + abs_lc = get_abs_lowcore(&flags); + abs_lc->restart_flags = RESTART_FLAG_CTLREGS; + abs_lc->program_new_psw = S390_lowcore.program_new_psw; + for (i = 0; i < 16; i++) + abs_lc->cregs_save_area[i] = S390_lowcore.cregs_save_area[i]; + put_abs_lowcore(abs_lc, flags); +} + +static struct resource code_resource = { + .name = "Kernel code", + .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, +}; + +static struct resource data_resource = { + .name = "Kernel data", + .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, +}; + +static struct resource bss_resource = { + .name = "Kernel bss", + .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, +}; + +static struct resource __initdata *standard_resources[] = { + &code_resource, + &data_resource, + &bss_resource, +}; + +static void __init setup_resources(void) +{ + struct resource *res, *std_res, *sub_res; + phys_addr_t start, end; + int j; + u64 i; + + code_resource.start = (unsigned long) _text; + code_resource.end = (unsigned long) _etext - 1; + data_resource.start = (unsigned long) _etext; + data_resource.end = (unsigned long) _edata - 1; + bss_resource.start = (unsigned long) __bss_start; + bss_resource.end = (unsigned long) __bss_stop - 1; + + for_each_mem_range(i, &start, &end) { + res = memblock_alloc(sizeof(*res), 8); + if (!res) + panic("%s: Failed to allocate %zu bytes align=0x%x\n", + __func__, sizeof(*res), 8); + res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; + + res->name = "System RAM"; + res->start = start; + /* + * In memblock, end points to the first byte after the + * range while in resourses, end points to the last byte in + * the range. + */ + res->end = end - 1; + request_resource(&iomem_resource, res); + + for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { + std_res = standard_resources[j]; + if (std_res->start < res->start || + std_res->start > res->end) + continue; + if (std_res->end > res->end) { + sub_res = memblock_alloc(sizeof(*sub_res), 8); + if (!sub_res) + panic("%s: Failed to allocate %zu bytes align=0x%x\n", + __func__, sizeof(*sub_res), 8); + *sub_res = *std_res; + sub_res->end = res->end; + std_res->start = res->end + 1; + request_resource(res, sub_res); + } else { + request_resource(res, std_res); + } + } + } +#ifdef CONFIG_CRASH_DUMP + /* + * Re-add removed crash kernel memory as reserved memory. This makes + * sure it will be mapped with the identity mapping and struct pages + * will be created, so it can be resized later on. + * However add it later since the crash kernel resource should not be + * part of the System RAM resource. + */ + if (crashk_res.end) { + memblock_add_node(crashk_res.start, resource_size(&crashk_res), + 0, MEMBLOCK_NONE); + memblock_reserve(crashk_res.start, resource_size(&crashk_res)); + insert_resource(&iomem_resource, &crashk_res); + } +#endif +} + +static void __init setup_memory_end(void) +{ + memblock_remove(ident_map_size, PHYS_ADDR_MAX - ident_map_size); + max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); + pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); +} + +#ifdef CONFIG_CRASH_DUMP + +/* + * When kdump is enabled, we have to ensure that no memory from the area + * [0 - crashkernel memory size] is set offline - it will be exchanged with + * the crashkernel memory region when kdump is triggered. The crashkernel + * memory region can never get offlined (pages are unmovable). + */ +static int kdump_mem_notifier(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct memory_notify *arg = data; + + if (action != MEM_GOING_OFFLINE) + return NOTIFY_OK; + if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) + return NOTIFY_BAD; + return NOTIFY_OK; +} + +static struct notifier_block kdump_mem_nb = { + .notifier_call = kdump_mem_notifier, +}; + +#endif + +/* + * Reserve memory for kdump kernel to be loaded with kexec + */ +static void __init reserve_crashkernel(void) +{ +#ifdef CONFIG_CRASH_DUMP + unsigned long long crash_base, crash_size; + phys_addr_t low, high; + int rc; + + rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size, + &crash_base); + + crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); + crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); + if (rc || crash_size == 0) + return; + + if (memblock.memory.regions[0].size < crash_size) { + pr_info("crashkernel reservation failed: %s\n", + "first memory chunk must be at least crashkernel size"); + return; + } + + low = crash_base ?: oldmem_data.start; + high = low + crash_size; + if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) { + /* The crashkernel fits into OLDMEM, reuse OLDMEM */ + crash_base = low; + } else { + /* Find suitable area in free memory */ + low = max_t(unsigned long, crash_size, sclp.hsa_size); + high = crash_base ? crash_base + crash_size : ULONG_MAX; + + if (crash_base && crash_base < low) { + pr_info("crashkernel reservation failed: %s\n", + "crash_base too low"); + return; + } + low = crash_base ?: low; + crash_base = memblock_phys_alloc_range(crash_size, + KEXEC_CRASH_MEM_ALIGN, + low, high); + } + + if (!crash_base) { + pr_info("crashkernel reservation failed: %s\n", + "no suitable area found"); + return; + } + + if (register_memory_notifier(&kdump_mem_nb)) { + memblock_phys_free(crash_base, crash_size); + return; + } + + if (!oldmem_data.start && MACHINE_IS_VM) + diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); + crashk_res.start = crash_base; + crashk_res.end = crash_base + crash_size - 1; + memblock_remove(crash_base, crash_size); + pr_info("Reserving %lluMB of memory at %lluMB " + "for crashkernel (System RAM: %luMB)\n", + crash_size >> 20, crash_base >> 20, + (unsigned long)memblock.memory.total_size >> 20); + os_info_crashkernel_add(crash_base, crash_size); +#endif +} + +/* + * Reserve the initrd from being used by memblock + */ +static void __init reserve_initrd(void) +{ +#ifdef CONFIG_BLK_DEV_INITRD + if (!initrd_data.start || !initrd_data.size) + return; + initrd_start = (unsigned long)__va(initrd_data.start); + initrd_end = initrd_start + initrd_data.size; + memblock_reserve(initrd_data.start, initrd_data.size); +#endif +} + +/* + * Reserve the memory area used to pass the certificate lists + */ +static void __init reserve_certificate_list(void) +{ + if (ipl_cert_list_addr) + memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); +} + +static void __init reserve_mem_detect_info(void) +{ + unsigned long start, size; + + get_mem_detect_reserved(&start, &size); + if (size) + memblock_reserve(start, size); +} + +static void __init free_mem_detect_info(void) +{ + unsigned long start, size; + + get_mem_detect_reserved(&start, &size); + if (size) + memblock_phys_free(start, size); +} + +static const char * __init get_mem_info_source(void) +{ + switch (mem_detect.info_source) { + case MEM_DETECT_SCLP_STOR_INFO: + return "sclp storage info"; + case MEM_DETECT_DIAG260: + return "diag260"; + case MEM_DETECT_SCLP_READ_INFO: + return "sclp read info"; + case MEM_DETECT_BIN_SEARCH: + return "binary search"; + } + return "none"; +} + +static void __init memblock_add_mem_detect_info(void) +{ + unsigned long start, end; + int i; + + pr_debug("physmem info source: %s (%hhd)\n", + get_mem_info_source(), mem_detect.info_source); + /* keep memblock lists close to the kernel */ + memblock_set_bottom_up(true); + for_each_mem_detect_block(i, &start, &end) { + memblock_add(start, end - start); + memblock_physmem_add(start, end - start); + } + memblock_set_bottom_up(false); + memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); +} + +/* + * Check for initrd being in usable memory + */ +static void __init check_initrd(void) +{ +#ifdef CONFIG_BLK_DEV_INITRD + if (initrd_data.start && initrd_data.size && + !memblock_is_region_memory(initrd_data.start, initrd_data.size)) { + pr_err("The initial RAM disk does not fit into the memory\n"); + memblock_phys_free(initrd_data.start, initrd_data.size); + initrd_start = initrd_end = 0; + } +#endif +} + +/* + * Reserve memory used for lowcore/command line/kernel image. + */ +static void __init reserve_kernel(void) +{ + memblock_reserve(0, STARTUP_NORMAL_OFFSET); + memblock_reserve(OLDMEM_BASE, sizeof(unsigned long)); + memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long)); + memblock_reserve(__amode31_base, __eamode31 - __samode31); + memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP); + memblock_reserve(__pa(_stext), _end - _stext); +} + +static void __init setup_memory(void) +{ + phys_addr_t start, end; + u64 i; + + /* + * Init storage key for present memory + */ + for_each_mem_range(i, &start, &end) + storage_key_init_range(start, end); + + psw_set_key(PAGE_DEFAULT_KEY); +} + +static void __init relocate_amode31_section(void) +{ + unsigned long amode31_size = __eamode31 - __samode31; + long amode31_offset = __amode31_base - __samode31; + long *ptr; + + pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size); + + /* Move original AMODE31 section to the new one */ + memmove((void *)__amode31_base, (void *)__samode31, amode31_size); + /* Zero out the old AMODE31 section to catch invalid accesses within it */ + memset((void *)__samode31, 0, amode31_size); + + /* Update all AMODE31 region references */ + for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++) + *ptr += amode31_offset; +} + +/* This must be called after AMODE31 relocation */ +static void __init setup_cr(void) +{ + union ctlreg2 cr2; + union ctlreg5 cr5; + union ctlreg15 cr15; + + __ctl_duct[1] = (unsigned long)__ctl_aste; + __ctl_duct[2] = (unsigned long)__ctl_aste; + __ctl_duct[4] = (unsigned long)__ctl_duald; + + /* Update control registers CR2, CR5 and CR15 */ + __ctl_store(cr2.val, 2, 2); + __ctl_store(cr5.val, 5, 5); + __ctl_store(cr15.val, 15, 15); + cr2.ducto = (unsigned long)__ctl_duct >> 6; + cr5.pasteo = (unsigned long)__ctl_duct >> 6; + cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3; + __ctl_load(cr2.val, 2, 2); + __ctl_load(cr5.val, 5, 5); + __ctl_load(cr15.val, 15, 15); +} + +/* + * Add system information as device randomness + */ +static void __init setup_randomness(void) +{ + struct sysinfo_3_2_2 *vmms; + + vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!vmms) + panic("Failed to allocate memory for sysinfo structure\n"); + if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) + add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); + memblock_free(vmms, PAGE_SIZE); + + if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG)) + static_branch_enable(&s390_arch_random_available); +} + +/* + * Find the correct size for the task_struct. This depends on + * the size of the struct fpu at the end of the thread_struct + * which is embedded in the task_struct. + */ +static void __init setup_task_size(void) +{ + int task_size = sizeof(struct task_struct); + + if (!MACHINE_HAS_VX) { + task_size -= sizeof(__vector128) * __NUM_VXRS; + task_size += sizeof(freg_t) * __NUM_FPRS; + } + arch_task_struct_size = task_size; +} + +/* + * Issue diagnose 318 to set the control program name and + * version codes. + */ +static void __init setup_control_program_code(void) +{ + union diag318_info diag318_info = { + .cpnc = CPNC_LINUX, + .cpvc = 0, + }; + + if (!sclp.has_diag318) + return; + + diag_stat_inc(DIAG_STAT_X318); + asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); +} + +/* + * Print the component list from the IPL report + */ +static void __init log_component_list(void) +{ + struct ipl_rb_component_entry *ptr, *end; + char *str; + + if (!early_ipl_comp_list_addr) + return; + if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) + pr_info("Linux is running with Secure-IPL enabled\n"); + else + pr_info("Linux is running with Secure-IPL disabled\n"); + ptr = (void *) early_ipl_comp_list_addr; + end = (void *) ptr + early_ipl_comp_list_size; + pr_info("The IPL report contains the following components:\n"); + while (ptr < end) { + if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { + if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) + str = "signed, verified"; + else + str = "signed, verification failed"; + } else { + str = "not signed"; + } + pr_info("%016llx - %016llx (%s)\n", + ptr->addr, ptr->addr + ptr->len, str); + ptr++; + } +} + +/* + * Setup function called from init/main.c just after the banner + * was printed. + */ + +void __init setup_arch(char **cmdline_p) +{ + /* + * print what head.S has found out about the machine + */ + if (MACHINE_IS_VM) + pr_info("Linux is running as a z/VM " + "guest operating system in 64-bit mode\n"); + else if (MACHINE_IS_KVM) + pr_info("Linux is running under KVM in 64-bit mode\n"); + else if (MACHINE_IS_LPAR) + pr_info("Linux is running natively in 64-bit mode\n"); + else + pr_info("Linux is running as a guest in 64-bit mode\n"); + + log_component_list(); + + /* Have one command line that is parsed and saved in /proc/cmdline */ + /* boot_command_line has been already set up in early.c */ + *cmdline_p = boot_command_line; + + ROOT_DEV = Root_RAM0; + + setup_initial_init_mm(_text, _etext, _edata, _end); + + if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) + nospec_auto_detect(); + + jump_label_init(); + parse_early_param(); +#ifdef CONFIG_CRASH_DUMP + /* Deactivate elfcorehdr= kernel parameter */ + elfcorehdr_addr = ELFCORE_ADDR_MAX; +#endif + + os_info_init(); + setup_ipl(); + setup_task_size(); + setup_control_program_code(); + + /* Do some memory reservations *before* memory is added to memblock */ + reserve_kernel(); + reserve_initrd(); + reserve_certificate_list(); + reserve_mem_detect_info(); + memblock_set_current_limit(ident_map_size); + memblock_allow_resize(); + + /* Get information about *all* installed memory */ + memblock_add_mem_detect_info(); + + free_mem_detect_info(); + setup_memory_end(); + memblock_dump_all(); + setup_memory(); + + relocate_amode31_section(); + setup_cr(); + setup_uv(); + dma_contiguous_reserve(ident_map_size); + vmcp_cma_reserve(); + if (MACHINE_HAS_EDAT2) + hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); + + check_initrd(); + reserve_crashkernel(); +#ifdef CONFIG_CRASH_DUMP + /* + * Be aware that smp_save_dump_secondary_cpus() triggers a system reset. + * Therefore CPU and device initialization should be done afterwards. + */ + smp_save_dump_secondary_cpus(); +#endif + + setup_resources(); + setup_lowcore_dat_off(); + smp_fill_possible_mask(); + cpu_detect_mhz_feature(); + cpu_init(); + numa_setup(); + smp_detect_cpus(); + topology_init_early(); + + if (test_facility(193)) + static_branch_enable(&cpu_has_bear); + + /* + * Create kernel page tables and switch to virtual addressing. + */ + paging_init(); + memcpy_real_init(); + /* + * After paging_init created the kernel page table, the new PSWs + * in lowcore can now run with DAT enabled. + */ + setup_lowcore_dat_on(); +#ifdef CONFIG_CRASH_DUMP + smp_save_dump_ipl_cpu(); +#endif + + /* Setup default console */ + conmode_default(); + set_preferred_console(); + + apply_alternative_instructions(); + if (IS_ENABLED(CONFIG_EXPOLINE)) + nospec_init_branches(); + + /* Setup zfcp/nvme dump support */ + setup_zfcpdump(); + + /* Add system specific data to the random pool */ + setup_randomness(); +} |