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ARM: split off core mapping logic from create_mapping 

In order to be able to reuse the core mapping logic of create_mapping
for mapping the UEFI Runtime Services into a private set of page tables,
split it off from create_mapping() into a separate function
__create_mapping which we will wire up in a subsequent patch.

Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Ard Biesheuvel 2015-09-15 14:50:22 +02:00 committed by ard
parent 2937367b8a
commit 1bdb2d4ee0
1 changed files with 31 additions and 25 deletions
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56
arch/arm/mm/mmu.c
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@ -818,7 +818,8 @@ static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
}
#ifndef CONFIG_ARM_LPAE
static void __init create_36bit_mapping(struct map_desc *md,
static void __init create_36bit_mapping(struct mm_struct *mm,
struct map_desc *md,
const struct mem_type *type)
{
unsigned long addr, length, end;
@ -859,7 +860,7 @@ static void __init create_36bit_mapping(struct map_desc *md,
*/
phys |= (((md->pfn >> (32 - PAGE_SHIFT)) & 0xF) << 20);
pgd = pgd_offset_k(addr);
pgd = pgd_offset(mm, addr);
end = addr + length;
do {
pud_t *pud = pud_offset(pgd, addr);
@ -876,33 +877,13 @@ static void __init create_36bit_mapping(struct map_desc *md,
}
#endif /* !CONFIG_ARM_LPAE */
/*
* Create the page directory entries and any necessary
* page tables for the mapping specified by `md'. We
* are able to cope here with varying sizes and address
* offsets, and we take full advantage of sections and
* supersections.
*/
static void __init create_mapping(struct map_desc *md)
static void __init __create_mapping(struct mm_struct *mm, struct map_desc *md)
{
unsigned long addr, length, end;
phys_addr_t phys;
const struct mem_type *type;
pgd_t *pgd;
if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) {
pr_warn("BUG: not creating mapping for 0x%08llx at 0x%08lx in user region\n",
(long long)__pfn_to_phys((u64)md->pfn), md->virtual);
return;
}
if ((md->type == MT_DEVICE || md->type == MT_ROM) &&
md->virtual >= PAGE_OFFSET && md->virtual < FIXADDR_START &&
(md->virtual < VMALLOC_START || md->virtual >= VMALLOC_END)) {
pr_warn("BUG: mapping for 0x%08llx at 0x%08lx out of vmalloc space\n",
(long long)__pfn_to_phys((u64)md->pfn), md->virtual);
}
type = &mem_types[md->type];
#ifndef CONFIG_ARM_LPAE
@ -910,7 +891,7 @@ static void __init create_mapping(struct map_desc *md)
* Catch 36-bit addresses
*/
if (md->pfn >= 0x100000) {
create_36bit_mapping(md, type);
create_36bit_mapping(mm, md, type);
return;
}
#endif
@ -925,7 +906,7 @@ static void __init create_mapping(struct map_desc *md)
return;
}
pgd = pgd_offset_k(addr);
pgd = pgd_offset(mm, addr);
end = addr + length;
do {
unsigned long next = pgd_addr_end(addr, end);
@ -937,6 +918,31 @@ static void __init create_mapping(struct map_desc *md)
} while (pgd++, addr != end);
}
/*
* Create the page directory entries and any necessary
* page tables for the mapping specified by `md'. We
* are able to cope here with varying sizes and address
* offsets, and we take full advantage of sections and
* supersections.
*/
static void __init create_mapping(struct map_desc *md)
{
if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) {
pr_warn("BUG: not creating mapping for 0x%08llx at 0x%08lx in user region\n",
(long long)__pfn_to_phys((u64)md->pfn), md->virtual);
return;
}
if ((md->type == MT_DEVICE || md->type == MT_ROM) &&
md->virtual >= PAGE_OFFSET && md->virtual < FIXADDR_START &&
(md->virtual < VMALLOC_START || md->virtual >= VMALLOC_END)) {
pr_warn("BUG: mapping for 0x%08llx at 0x%08lx out of vmalloc space\n",
(long long)__pfn_to_phys((u64)md->pfn), md->virtual);
}
__create_mapping(&init_mm, md);
}
/*
* Create the architecture specific mappings
*/