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arm64/efi: refactor EFI init and runtime code for reuse by 32-bit ARM

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This refactors the EFI init and runtime code that will be shared
between arm64 and ARM so that it can be built for both archs.

Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Ard Biesheuvel 2015-11-30 13:28:19 +01:00 committed by Will Deacon
parent e5bc22a42e
commit f7d9248942
5 changed files with 54 additions and 35 deletions
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9
arch/arm64/include/asm/efi.h
View File

@ -2,7 +2,9 @@
#define _ASM_EFI_H
#include <asm/io.h>
#include <asm/mmu_context.h>
#include <asm/neon.h>
#include <asm/tlbflush.h>
#ifdef CONFIG_EFI
extern void efi_init(void);
@ -10,6 +12,8 @@ extern void efi_init(void);
#define efi_init()
#endif
int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
#define efi_call_virt(f, ...) \
({ \
efi_##f##_t *__f; \
@ -63,6 +67,11 @@ extern void efi_init(void);
* Services are enabled and the EFI_RUNTIME_SERVICES bit set.
*/
static inline void efi_set_pgd(struct mm_struct *mm)
{
switch_mm(NULL, mm, NULL);
}
void efi_virtmap_load(void);
void efi_virtmap_unload(void);

23
arch/arm64/kernel/efi.c
View File

@ -17,6 +17,29 @@
#include <asm/efi.h>
int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
{
pteval_t prot_val;
/*
* Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
* executable, everything else can be mapped with the XN bits
* set.
*/
if ((md->attribute & EFI_MEMORY_WB) == 0)
prot_val = PROT_DEVICE_nGnRE;
else if (md->type == EFI_RUNTIME_SERVICES_CODE ||
!PAGE_ALIGNED(md->phys_addr))
prot_val = pgprot_val(PAGE_KERNEL_EXEC);
else
prot_val = pgprot_val(PAGE_KERNEL);
create_pgd_mapping(mm, md->phys_addr, md->virt_addr,
md->num_pages << EFI_PAGE_SHIFT,
__pgprot(prot_val | PTE_NG));
return 0;
}
static int __init arm64_dmi_init(void)
{
/*

7
drivers/firmware/efi/arm-init.c
View File

@ -57,7 +57,7 @@ static int __init uefi_init(void)
{
efi_char16_t *c16;
void *config_tables;
u64 table_size;
size_t table_size;
char vendor[100] = "unknown";
int i, retval;
@ -69,7 +69,8 @@ static int __init uefi_init(void)
}
set_bit(EFI_BOOT, &efi.flags);
set_bit(EFI_64BIT, &efi.flags);
if (IS_ENABLED(CONFIG_64BIT))
set_bit(EFI_64BIT, &efi.flags);
/*
* Verify the EFI Table
@ -107,7 +108,7 @@ static int __init uefi_init(void)
goto out;
}
retval = efi_config_parse_tables(config_tables, efi.systab->nr_tables,
sizeof(efi_config_table_64_t), NULL);
sizeof(efi_config_table_t), NULL);
early_memunmap(config_tables, table_size);
out:

48
drivers/firmware/efi/arm-runtime.c
View File

@ -12,6 +12,7 @@
*/
#include <linux/efi.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/mm_types.h>
#include <linux/preempt.h>
@ -23,18 +24,14 @@
#include <asm/cacheflush.h>
#include <asm/efi.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
#include <asm/mmu.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
static pgd_t efi_pgd[PTRS_PER_PGD] __page_aligned_bss;
extern u64 efi_system_table;
static struct mm_struct efi_mm = {
.mm_rb = RB_ROOT,
.pgd = efi_pgd,
.mm_users = ATOMIC_INIT(2),
.mm_count = ATOMIC_INIT(1),
.mmap_sem = __RWSEM_INITIALIZER(efi_mm.mmap_sem),
@ -46,35 +43,27 @@ static bool __init efi_virtmap_init(void)
{
efi_memory_desc_t *md;
efi_mm.pgd = pgd_alloc(&efi_mm);
init_new_context(NULL, &efi_mm);
for_each_efi_memory_desc(&memmap, md) {
pgprot_t prot;
phys_addr_t phys = md->phys_addr;
int ret;
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
if (md->virt_addr == 0)
return false;
pr_info(" EFI remap 0x%016llx => %p\n",
md->phys_addr, (void *)md->virt_addr);
/*
* Only regions of type EFI_RUNTIME_SERVICES_CODE need to be
* executable, everything else can be mapped with the XN bits
* set.
*/
if ((md->attribute & EFI_MEMORY_WB) == 0)
prot = __pgprot(PROT_DEVICE_nGnRE);
else if (md->type == EFI_RUNTIME_SERVICES_CODE ||
!PAGE_ALIGNED(md->phys_addr))
prot = PAGE_KERNEL_EXEC;
else
prot = PAGE_KERNEL;
create_pgd_mapping(&efi_mm, md->phys_addr, md->virt_addr,
md->num_pages << EFI_PAGE_SHIFT,
__pgprot(pgprot_val(prot) | PTE_NG));
ret = efi_create_mapping(&efi_mm, md);
if (!ret) {
pr_info(" EFI remap %pa => %p\n",
&phys, (void *)(unsigned long)md->virt_addr);
} else {
pr_warn(" EFI remap %pa: failed to create mapping (%d)\n",
&phys, ret);
return false;
}
}
return true;
}
@ -84,7 +73,7 @@ static bool __init efi_virtmap_init(void)
* non-early mapping of the UEFI system table and virtual mappings for all
* EFI_MEMORY_RUNTIME regions.
*/
static int __init arm64_enable_runtime_services(void)
static int __init arm_enable_runtime_services(void)
{
u64 mapsize;
@ -131,12 +120,7 @@ static int __init arm64_enable_runtime_services(void)
return 0;
}
early_initcall(arm64_enable_runtime_services);
static void efi_set_pgd(struct mm_struct *mm)
{
switch_mm(NULL, mm, NULL);
}
early_initcall(arm_enable_runtime_services);
void efi_virtmap_load(void)
{

2
drivers/firmware/efi/efi.c
View File

@ -25,6 +25,8 @@
#include <linux/io.h>
#include <linux/platform_device.h>
#include <asm/efi.h>
struct efi __read_mostly efi = {
.mps = EFI_INVALID_TABLE_ADDR,
.acpi = EFI_INVALID_TABLE_ADDR,