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arm64/efi: move virtmap init to early initcall

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Now that the create_mapping() code in mm/mmu.c is able to support
setting up kernel page tables at initcall time, we can move the whole
virtmap creation to arm64_enable_runtime_services() instead of having
a distinct stage during early boot. This also allows us to drop the
arm64-specific EFI_VIRTMAP flag.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ard Biesheuvel
2015-01-22 10:01:40 +00:00
zatwierdzone przez Catalin Marinas
rodzic da141706ae
commit 60305db988
4 zmienionych plików z 59 dodań i 73 usunięć
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111
arch/arm64/kernel/efi.c
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@@ -38,6 +38,19 @@ struct efi_memory_map memmap;
static u64 efi_system_table;
static pgd_t efi_pgd[PTRS_PER_PGD] __page_aligned_bss;
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),
.page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
INIT_MM_CONTEXT(efi_mm)
};
static int uefi_debug __initdata;
static int __init uefi_debug_setup(char *str)
{
@@ -213,6 +226,45 @@ void __init efi_init(void)
return;
reserve_regions();
early_memunmap(memmap.map, params.mmap_size);
}
static bool __init efi_virtmap_init(void)
{
efi_memory_desc_t *md;
for_each_efi_memory_desc(&memmap, md) {
u64 paddr, npages, size;
pgprot_t prot;
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
if (md->virt_addr == 0)
return false;
paddr = md->phys_addr;
npages = md->num_pages;
memrange_efi_to_native(&paddr, &npages);
size = npages << PAGE_SHIFT;
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 (!is_normal_ram(md))
prot = __pgprot(PROT_DEVICE_nGnRE);
else if (md->type == EFI_RUNTIME_SERVICES_CODE)
prot = PAGE_KERNEL_EXEC;
else
prot = PAGE_KERNEL;
create_pgd_mapping(&efi_mm, paddr, md->virt_addr, size, prot);
}
return true;
}
/*
@@ -254,7 +306,7 @@ static int __init arm64_enable_runtime_services(void)
}
set_bit(EFI_SYSTEM_TABLES, &efi.flags);
if (!efi_enabled(EFI_VIRTMAP)) {
if (!efi_virtmap_init()) {
pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n");
return -1;
}
@@ -283,19 +335,6 @@ static int __init arm64_dmi_init(void)
}
core_initcall(arm64_dmi_init);
static pgd_t efi_pgd[PTRS_PER_PGD] __page_aligned_bss;
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),
.page_table_lock = __SPIN_LOCK_UNLOCKED(efi_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(efi_mm.mmlist),
INIT_MM_CONTEXT(efi_mm)
};
static void efi_set_pgd(struct mm_struct *mm)
{
cpu_switch_mm(mm->pgd, mm);
@@ -315,47 +354,3 @@ void efi_virtmap_unload(void)
efi_set_pgd(current->active_mm);
preempt_enable();
}
void __init efi_virtmap_init(void)
{
efi_memory_desc_t *md;
if (!efi_enabled(EFI_BOOT))
return;
for_each_efi_memory_desc(&memmap, md) {
u64 paddr, npages, size;
pgprot_t prot;
if (!(md->attribute & EFI_MEMORY_RUNTIME))
continue;
if (WARN(md->virt_addr == 0,
"UEFI virtual mapping incomplete or missing -- no entry found for 0x%llx\n",
md->phys_addr))
return;
paddr = md->phys_addr;
npages = md->num_pages;
memrange_efi_to_native(&paddr, &npages);
size = npages << PAGE_SHIFT;
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 (!is_normal_ram(md))
prot = __pgprot(PROT_DEVICE_nGnRE);
else if (md->type == EFI_RUNTIME_SERVICES_CODE)
prot = PAGE_KERNEL_EXEC;
else
prot = PAGE_KERNEL;
create_pgd_mapping(&efi_mm, paddr, md->virt_addr, size, prot);
}
set_bit(EFI_VIRTMAP, &efi.flags);
early_memunmap(memmap.map, memmap.map_end - memmap.map);
}