Commit bc16d405 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull EFI updates from Ingo Molnar:
 "The main EFI changes in this cycle were:

   - Fix the apple-properties code (Andy Shevchenko)

   - Add WARN() on arm64 if UEFI Runtime Services corrupt the reserved
     x18 register (Ard Biesheuvel)

   - Use efi_switch_mm() on x86 instead of manipulating %cr3 directly
     (Sai Praneeth)

   - Fix early memremap leak in ESRT code (Ard Biesheuvel)

   - Switch to L"xxx" notation for wide string literals (Ard Biesheuvel)

   - ... plus misc other cleanups and bugfixes"

* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/efi: Use efi_switch_mm() rather than manually twiddling with %cr3
  x86/efi: Replace efi_pgd with efi_mm.pgd
  efi: Use string literals for efi_char16_t variable initializers
  efi/esrt: Fix handling of early ESRT table mapping
  efi: Use efi_mm in x86 as well as ARM
  efi: Make const array 'apple' static
  efi/apple-properties: Use memremap() instead of ioremap()
  efi: Reorder pr_notice() with add_device_randomness() call
  x86/efi: Replace GFP_ATOMIC with GFP_KERNEL in efi_query_variable_store()
  efi/arm64: Check whether x18 is preserved by runtime services calls
  efi/arm*: Stop printing addresses of virtual mappings
  efi/apple-properties: Remove redundant attribute initialization from unmarshal_key_value_pairs()
  efi/arm*: Only register page tables when they exist
parents 2fcd2b30 03781e40
......@@ -31,7 +31,7 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
({ \
efi_##f##_t *__f; \
__f = p->f; \
__f(args); \
__efi_rt_asm_wrapper(__f, #f, args); \
})
#define arch_efi_call_virt_teardown() \
......@@ -40,6 +40,8 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
efi_virtmap_unload(); \
})
efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...);
#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
/* arch specific definitions used by the stub code */
......
......@@ -38,7 +38,8 @@ arm64-obj-$(CONFIG_CPU_PM) += sleep.o suspend.o
arm64-obj-$(CONFIG_CPU_IDLE) += cpuidle.o
arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
arm64-obj-$(CONFIG_KGDB) += kgdb.o
arm64-obj-$(CONFIG_EFI) += efi.o efi-entry.stub.o
arm64-obj-$(CONFIG_EFI) += efi.o efi-entry.stub.o \
efi-rt-wrapper.o
arm64-obj-$(CONFIG_PCI) += pci.o
arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
arm64-obj-$(CONFIG_ACPI) += acpi.o
......
/*
* Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
*
* 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/linkage.h>
ENTRY(__efi_rt_asm_wrapper)
stp x29, x30, [sp, #-32]!
mov x29, sp
/*
* Register x18 is designated as the 'platform' register by the AAPCS,
* which means firmware running at the same exception level as the OS
* (such as UEFI) should never touch it.
*/
stp x1, x18, [sp, #16]
/*
* We are lucky enough that no EFI runtime services take more than
* 5 arguments, so all are passed in registers rather than via the
* stack.
*/
mov x8, x0
mov x0, x2
mov x1, x3
mov x2, x4
mov x3, x5
mov x4, x6
blr x8
ldp x1, x2, [sp, #16]
cmp x2, x18
ldp x29, x30, [sp], #32
b.ne 0f
ret
0: b efi_handle_corrupted_x18 // tail call
ENDPROC(__efi_rt_asm_wrapper)
......@@ -126,3 +126,9 @@ bool efi_poweroff_required(void)
{
return efi_enabled(EFI_RUNTIME_SERVICES);
}
asmlinkage efi_status_t efi_handle_corrupted_x18(efi_status_t s, const char *f)
{
pr_err_ratelimited(FW_BUG "register x18 corrupted by EFI %s\n", f);
return s;
}
......@@ -421,9 +421,10 @@ static void retrieve_apple_device_properties(struct boot_params *boot_params)
}
}
static const efi_char16_t apple[] = L"Apple";
static void setup_quirks(struct boot_params *boot_params)
{
efi_char16_t const apple[] = { 'A', 'p', 'p', 'l', 'e', 0 };
efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
efi_table_attr(efi_system_table, fw_vendor, sys_table);
......
......@@ -7,6 +7,7 @@
#include <asm/processor-flags.h>
#include <asm/tlb.h>
#include <asm/nospec-branch.h>
#include <asm/mmu_context.h>
/*
* We map the EFI regions needed for runtime services non-contiguously,
......@@ -69,14 +70,13 @@ extern asmlinkage u64 efi_call(void *fp, ...);
#define efi_call_phys(f, args...) efi_call((f), args)
/*
* Scratch space used for switching the pagetable in the EFI stub
* struct efi_scratch - Scratch space used while switching to/from efi_mm
* @phys_stack: stack used during EFI Mixed Mode
* @prev_mm: store/restore stolen mm_struct while switching to/from efi_mm
*/
struct efi_scratch {
u64 r15;
u64 prev_cr3;
pgd_t *efi_pgt;
bool use_pgd;
u64 phys_stack;
u64 phys_stack;
struct mm_struct *prev_mm;
} __packed;
#define arch_efi_call_virt_setup() \
......@@ -86,11 +86,8 @@ struct efi_scratch {
__kernel_fpu_begin(); \
firmware_restrict_branch_speculation_start(); \
\
if (efi_scratch.use_pgd) { \
efi_scratch.prev_cr3 = __read_cr3(); \
write_cr3((unsigned long)efi_scratch.efi_pgt); \
__flush_tlb_all(); \
} \
if (!efi_enabled(EFI_OLD_MEMMAP)) \
efi_switch_mm(&efi_mm); \
})
#define arch_efi_call_virt(p, f, args...) \
......@@ -98,10 +95,8 @@ struct efi_scratch {
#define arch_efi_call_virt_teardown() \
({ \
if (efi_scratch.use_pgd) { \
write_cr3(efi_scratch.prev_cr3); \
__flush_tlb_all(); \
} \
if (!efi_enabled(EFI_OLD_MEMMAP)) \
efi_switch_mm(efi_scratch.prev_mm); \
\
firmware_restrict_branch_speculation_end(); \
__kernel_fpu_end(); \
......@@ -144,6 +139,7 @@ extern void __init efi_dump_pagetable(void);
extern void __init efi_apply_memmap_quirks(void);
extern int __init efi_reuse_config(u64 tables, int nr_tables);
extern void efi_delete_dummy_variable(void);
extern void efi_switch_mm(struct mm_struct *mm);
struct efi_setup_data {
u64 fw_vendor;
......
#include <linux/debugfs.h>
#include <linux/efi.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <asm/pgtable.h>
......@@ -73,13 +74,12 @@ static const struct file_operations ptdump_curusr_fops = {
#endif
#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
extern pgd_t *efi_pgd;
static struct dentry *pe_efi;
static int ptdump_show_efi(struct seq_file *m, void *v)
{
if (efi_pgd)
ptdump_walk_pgd_level_debugfs(m, efi_pgd, false);
if (efi_mm.pgd)
ptdump_walk_pgd_level_debugfs(m, efi_mm.pgd, false);
return 0;
}
......
......@@ -34,6 +34,7 @@
#include <linux/slab.h>
#include <linux/ucs2_string.h>
#include <linux/mem_encrypt.h>
#include <linux/sched/task.h>
#include <asm/setup.h>
#include <asm/page.h>
......@@ -82,9 +83,8 @@ pgd_t * __init efi_call_phys_prolog(void)
int n_pgds, i, j;
if (!efi_enabled(EFI_OLD_MEMMAP)) {
save_pgd = (pgd_t *)__read_cr3();
write_cr3((unsigned long)efi_scratch.efi_pgt);
goto out;
efi_switch_mm(&efi_mm);
return NULL;
}
early_code_mapping_set_exec(1);
......@@ -156,8 +156,7 @@ void __init efi_call_phys_epilog(pgd_t *save_pgd)
pud_t *pud;
if (!efi_enabled(EFI_OLD_MEMMAP)) {
write_cr3((unsigned long)save_pgd);
__flush_tlb_all();
efi_switch_mm(efi_scratch.prev_mm);
return;
}
......@@ -191,8 +190,7 @@ void __init efi_call_phys_epilog(pgd_t *save_pgd)
early_code_mapping_set_exec(0);
}
pgd_t *efi_pgd;
EXPORT_SYMBOL_GPL(efi_pgd);
EXPORT_SYMBOL_GPL(efi_mm);
/*
* We need our own copy of the higher levels of the page tables
......@@ -205,7 +203,7 @@ EXPORT_SYMBOL_GPL(efi_pgd);
*/
int __init efi_alloc_page_tables(void)
{
pgd_t *pgd;
pgd_t *pgd, *efi_pgd;
p4d_t *p4d;
pud_t *pud;
gfp_t gfp_mask;
......@@ -233,6 +231,10 @@ int __init efi_alloc_page_tables(void)
return -ENOMEM;
}
efi_mm.pgd = efi_pgd;
mm_init_cpumask(&efi_mm);
init_new_context(NULL, &efi_mm);
return 0;
}
......@@ -245,6 +247,7 @@ void efi_sync_low_kernel_mappings(void)
pgd_t *pgd_k, *pgd_efi;
p4d_t *p4d_k, *p4d_efi;
pud_t *pud_k, *pud_efi;
pgd_t *efi_pgd = efi_mm.pgd;
if (efi_enabled(EFI_OLD_MEMMAP))
return;
......@@ -338,19 +341,11 @@ int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
unsigned long pfn, text, pf;
struct page *page;
unsigned npages;
pgd_t *pgd;
pgd_t *pgd = efi_mm.pgd;
if (efi_enabled(EFI_OLD_MEMMAP))
return 0;
/*
* Since the PGD is encrypted, set the encryption mask so that when
* this value is loaded into cr3 the PGD will be decrypted during
* the pagetable walk.
*/
efi_scratch.efi_pgt = (pgd_t *)__sme_pa(efi_pgd);
pgd = efi_pgd;
/*
* It can happen that the physical address of new_memmap lands in memory
* which is not mapped in the EFI page table. Therefore we need to go
......@@ -364,8 +359,6 @@ int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
return 1;
}
efi_scratch.use_pgd = true;
/*
* Certain firmware versions are way too sentimential and still believe
* they are exclusive and unquestionable owners of the first physical page,
......@@ -419,7 +412,7 @@ static void __init __map_region(efi_memory_desc_t *md, u64 va)
{
unsigned long flags = _PAGE_RW;
unsigned long pfn;
pgd_t *pgd = efi_pgd;
pgd_t *pgd = efi_mm.pgd;
if (!(md->attribute & EFI_MEMORY_WB))
flags |= _PAGE_PCD;
......@@ -523,7 +516,7 @@ void __init parse_efi_setup(u64 phys_addr, u32 data_len)
static int __init efi_update_mappings(efi_memory_desc_t *md, unsigned long pf)
{
unsigned long pfn;
pgd_t *pgd = efi_pgd;
pgd_t *pgd = efi_mm.pgd;
int err1, err2;
/* Update the 1:1 mapping */
......@@ -620,10 +613,26 @@ void __init efi_dump_pagetable(void)
if (efi_enabled(EFI_OLD_MEMMAP))
ptdump_walk_pgd_level(NULL, swapper_pg_dir);
else
ptdump_walk_pgd_level(NULL, efi_pgd);
ptdump_walk_pgd_level(NULL, efi_mm.pgd);
#endif
}
/*
* Makes the calling thread switch to/from efi_mm context. Can be used
* for SetVirtualAddressMap() i.e. current->active_mm == init_mm as well
* as during efi runtime calls i.e current->active_mm == current_mm.
* We are not mm_dropping()/mm_grabbing() any mm, because we are not
* losing/creating any references.
*/
void efi_switch_mm(struct mm_struct *mm)
{
task_lock(current);
efi_scratch.prev_mm = current->active_mm;
current->active_mm = mm;
switch_mm(efi_scratch.prev_mm, mm, NULL);
task_unlock(current);
}
#ifdef CONFIG_EFI_MIXED
extern efi_status_t efi64_thunk(u32, ...);
......@@ -677,16 +686,13 @@ efi_status_t efi_thunk_set_virtual_address_map(
efi_sync_low_kernel_mappings();
local_irq_save(flags);
efi_scratch.prev_cr3 = __read_cr3();
write_cr3((unsigned long)efi_scratch.efi_pgt);
__flush_tlb_all();
efi_switch_mm(&efi_mm);
func = (u32)(unsigned long)phys_set_virtual_address_map;
status = efi64_thunk(func, memory_map_size, descriptor_size,
descriptor_version, virtual_map);
write_cr3(efi_scratch.prev_cr3);
__flush_tlb_all();
efi_switch_mm(efi_scratch.prev_mm);
local_irq_restore(flags);
return status;
......
......@@ -33,7 +33,7 @@ ENTRY(efi64_thunk)
* Switch to 1:1 mapped 32-bit stack pointer.
*/
movq %rsp, efi_saved_sp(%rip)
movq efi_scratch+25(%rip), %rsp
movq efi_scratch(%rip), %rsp
/*
* Calculate the physical address of the kernel text.
......
......@@ -75,7 +75,7 @@ struct quark_security_header {
u32 rsvd[2];
};
static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 };
static const efi_char16_t efi_dummy_name[] = L"DUMMY";
static bool efi_no_storage_paranoia;
......@@ -105,7 +105,8 @@ early_param("efi_no_storage_paranoia", setup_storage_paranoia);
*/
void efi_delete_dummy_variable(void)
{
efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
efi.set_variable((efi_char16_t *)efi_dummy_name,
&EFI_DUMMY_GUID,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
......@@ -177,12 +178,13 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size,
* that by attempting to use more space than is available.
*/
unsigned long dummy_size = remaining_size + 1024;
void *dummy = kzalloc(dummy_size, GFP_ATOMIC);
void *dummy = kzalloc(dummy_size, GFP_KERNEL);
if (!dummy)
return EFI_OUT_OF_RESOURCES;
status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
status = efi.set_variable((efi_char16_t *)efi_dummy_name,
&EFI_DUMMY_GUID,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
......
......@@ -19,6 +19,7 @@
#include <linux/bootmem.h>
#include <linux/efi.h>
#include <linux/io.h>
#include <linux/platform_data/x86/apple.h>
#include <linux/property.h>
#include <linux/slab.h>
......@@ -52,8 +53,6 @@ struct properties_header {
struct dev_header dev_header[0];
};
static u8 one __initdata = 1;
static void __init unmarshal_key_value_pairs(struct dev_header *dev_header,
struct device *dev, void *ptr,
struct property_entry entry[])
......@@ -95,14 +94,9 @@ static void __init unmarshal_key_value_pairs(struct dev_header *dev_header,
key_len - sizeof(key_len));
entry[i].name = key;
entry[i].is_array = true;
entry[i].length = val_len - sizeof(val_len);
entry[i].is_array = !!entry[i].length;
entry[i].pointer.raw_data = ptr + key_len + sizeof(val_len);
if (!entry[i].length) {
/* driver core doesn't accept empty properties */
entry[i].length = 1;
entry[i].pointer.raw_data = &one;
}
if (dump_properties) {
dev_info(dev, "property: %s\n", entry[i].name);
......@@ -196,7 +190,7 @@ static int __init map_properties(void)
pa_data = boot_params.hdr.setup_data;
while (pa_data) {
data = ioremap(pa_data, sizeof(*data));
data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
if (!data) {
pr_err("cannot map setup_data header\n");
return -ENOMEM;
......@@ -204,14 +198,14 @@ static int __init map_properties(void)
if (data->type != SETUP_APPLE_PROPERTIES) {
pa_data = data->next;
iounmap(data);
memunmap(data);
continue;
}
data_len = data->len;
iounmap(data);
memunmap(data);
data = ioremap(pa_data, sizeof(*data) + data_len);
data = memremap(pa_data, sizeof(*data) + data_len, MEMREMAP_WB);
if (!data) {
pr_err("cannot map setup_data payload\n");
return -ENOMEM;
......@@ -236,7 +230,7 @@ static int __init map_properties(void)
* to avoid breaking the chain of ->next pointers.
*/
data->len = 0;
iounmap(data);
memunmap(data);
free_bootmem_late(pa_data + sizeof(*data), data_len);
return ret;
......
......@@ -31,15 +31,6 @@
extern u64 efi_system_table;
static struct mm_struct efi_mm = {
.mm_rb = RB_ROOT,
.mm_users = ATOMIC_INIT(2),
.mm_count = ATOMIC_INIT(1),
.mmap_sem = __RWSEM_INITIALIZER(efi_mm.mmap_sem),
.page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
};
#ifdef CONFIG_ARM64_PTDUMP_DEBUGFS
#include <asm/ptdump.h>
......@@ -54,6 +45,9 @@ static struct ptdump_info efi_ptdump_info = {
static int __init ptdump_init(void)
{
if (!efi_enabled(EFI_RUNTIME_SERVICES))
return 0;
return ptdump_debugfs_register(&efi_ptdump_info, "efi_page_tables");
}
device_initcall(ptdump_init);
......@@ -80,10 +74,7 @@ static bool __init efi_virtmap_init(void)
return false;
ret = efi_create_mapping(&efi_mm, md);
if (!ret) {
pr_info(" EFI remap %pa => %p\n",
&phys, (void *)(unsigned long)md->virt_addr);
} else {
if (ret) {
pr_warn(" EFI remap %pa: failed to create mapping (%d)\n",
&phys, ret);
return false;
......
......@@ -75,6 +75,15 @@ static unsigned long *efi_tables[] = {
&efi.mem_attr_table,
};
struct mm_struct efi_mm = {
.mm_rb = RB_ROOT,
.mm_users = ATOMIC_INIT(2),
.mm_count = ATOMIC_INIT(1),
.mmap_sem = __RWSEM_INITIALIZER(efi_mm.mmap_sem),
.page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
};
static bool disable_runtime;
static int __init setup_noefi(char *arg)
{
......@@ -542,9 +551,9 @@ int __init efi_config_parse_tables(void *config_tables, int count, int sz,
seed = early_memremap(efi.rng_seed,
sizeof(*seed) + size);
if (seed != NULL) {
pr_notice("seeding entropy pool\n");
add_device_randomness(seed->bits, seed->size);
early_memunmap(seed, sizeof(*seed) + size);
pr_notice("seeding entropy pool\n");
} else {
pr_err("Could not map UEFI random seed!\n");
}
......
......@@ -279,6 +279,7 @@ void __init efi_esrt_init(void)
}
memcpy(&tmpesrt, va, sizeof(tmpesrt));
early_memunmap(va, size);
if (tmpesrt.fw_resource_version == 1) {
entry_size = sizeof (*v1_entries);
......@@ -291,7 +292,7 @@ void __init efi_esrt_init(void)
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);
goto err_memunmap;
return;
}
/*
......@@ -304,7 +305,7 @@ void __init efi_esrt_init(void)
if (tmpesrt.fw_resource_count > 128) {
pr_err("ESRT says fw_resource_count has very large value %d.\n",
tmpesrt.fw_resource_count);
goto err_memunmap;
return;
}
/*
......@@ -315,18 +316,10 @@ void __init efi_esrt_init(void)
if (max < size + entries_size) {
pr_err("ESRT does not fit on single memory map entry (size: %zu max: %zu)\n",
size, max);
goto err_memunmap;
return;
}
/* remap it with our (plausible) new pages */
early_memunmap(va, size);
size += entries_size;
va = early_memremap(efi.esrt, size);
if (!va) {
pr_err("early_memremap(%p, %zu) failed.\n", (void *)efi.esrt,
size);
return;
}
esrt_data = (phys_addr_t)efi.esrt;
esrt_data_size = size;
......@@ -336,8 +329,6 @@ void __init efi_esrt_init(void)
efi_mem_reserve(esrt_data, esrt_data_size);
pr_debug("esrt-init: loaded.\n");
err_memunmap:
early_memunmap(va, size);
}
static int __init register_entries(void)
......
......@@ -9,7 +9,7 @@ cflags-$(CONFIG_X86_32) := -march=i386
cflags-$(CONFIG_X86_64) := -mcmodel=small
cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ -O2 \
-fPIC -fno-strict-aliasing -mno-red-zone \
-mno-mmx -mno-sse
-mno-mmx -mno-sse -fshort-wchar
cflags-$(CONFIG_ARM64) := $(subst -pg,,$(KBUILD_CFLAGS)) -fpie
cflags-$(CONFIG_ARM) := $(subst -pg,,$(KBUILD_CFLAGS)) \
......
......@@ -16,18 +16,12 @@
/* BIOS variables */
static const efi_guid_t efi_variable_guid = EFI_GLOBAL_VARIABLE_GUID;
static const efi_char16_t efi_SecureBoot_name[] = {
'S', 'e', 'c', 'u', 'r', 'e', 'B', 'o', 'o', 't', 0
};
static const efi_char16_t efi_SetupMode_name[] = {
'S', 'e', 't', 'u', 'p', 'M', 'o', 'd', 'e', 0
};
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 efi_char16_t const shim_MokSBState_name[] = {
'M', 'o', 'k', 'S', 'B', 'S', 't', 'a', 't', 'e', 0
};
static const efi_char16_t shim_MokSBState_name[] = L"MokSBState";
#define get_efi_var(name, vendor, ...) \
efi_call_runtime(get_variable, \
......
......@@ -16,11 +16,8 @@
#include "efistub.h"
#ifdef CONFIG_RESET_ATTACK_MITIGATION
static const efi_char16_t efi_MemoryOverWriteRequest_name[] = {
'M', 'e', 'm', 'o', 'r', 'y', 'O', 'v', 'e', 'r', 'w', 'r', 'i', 't',
'e', 'R', 'e', 'q', 'u', 'e', 's', 't', 'C', 'o', 'n', 't', 'r', 'o',
'l', 0
};
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)
......
......@@ -966,6 +966,8 @@ extern struct efi {
unsigned long flags;
} efi;
extern struct mm_struct efi_mm;