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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2015-09-15 14:59:14 +0200
committerard <ard.biesheuvel@linaro.org>2015-12-13 19:18:29 +0100
commitf579b2b10412771ad5eaa785ddaa7b62b97a6e8d (patch)
tree4f002f657e73496ab358f6236e41df0e820d2402 /arch/arm/mm/mmu.c
parentARM: split off core mapping logic from create_mapping (diff)
downloadlinux-f579b2b10412771ad5eaa785ddaa7b62b97a6e8d.tar.xz
linux-f579b2b10412771ad5eaa785ddaa7b62b97a6e8d.zip
ARM: factor out allocation routine from __create_mapping()
To allow __create_mapping() to be used for populating UEFI Runtime Services page tables, factor out the allocation routine 'early_alloc' and pass it down as a function pointer into alloc_init_[pud|pmd|pte]. This way, new users of __create_mapping() can supply another allocation function. 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>
Diffstat (limited to 'arch/arm/mm/mmu.c')
-rw-r--r--arch/arm/mm/mmu.c34
1 files changed, 23 insertions, 11 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 3100de92148b..87dc49dbe231 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -724,21 +724,30 @@ static void __init *early_alloc(unsigned long sz)
return early_alloc_aligned(sz, sz);
}
-static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr, unsigned long prot)
+static pte_t * __init pte_alloc(pmd_t *pmd, unsigned long addr,
+ unsigned long prot,
+ void *(*alloc)(unsigned long sz))
{
if (pmd_none(*pmd)) {
- pte_t *pte = early_alloc(PTE_HWTABLE_OFF + PTE_HWTABLE_SIZE);
+ pte_t *pte = alloc(PTE_HWTABLE_OFF + PTE_HWTABLE_SIZE);
__pmd_populate(pmd, __pa(pte), prot);
}
BUG_ON(pmd_bad(*pmd));
return pte_offset_kernel(pmd, addr);
}
+static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr,
+ unsigned long prot)
+{
+ return pte_alloc(pmd, addr, prot, early_alloc);
+}
+
static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
unsigned long end, unsigned long pfn,
- const struct mem_type *type)
+ const struct mem_type *type,
+ void *(*alloc)(unsigned long sz))
{
- pte_t *pte = early_pte_alloc(pmd, addr, type->prot_l1);
+ pte_t *pte = pte_alloc(pmd, addr, type->prot_l1, alloc);
do {
set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)), 0);
pfn++;
@@ -774,7 +783,8 @@ static void __init __map_init_section(pmd_t *pmd, unsigned long addr,
static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
unsigned long end, phys_addr_t phys,
- const struct mem_type *type)
+ const struct mem_type *type,
+ void *(*alloc)(unsigned long sz))
{
pmd_t *pmd = pmd_offset(pud, addr);
unsigned long next;
@@ -795,7 +805,7 @@ static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
__map_init_section(pmd, addr, next, phys, type);
} else {
alloc_init_pte(pmd, addr, next,
- __phys_to_pfn(phys), type);
+ __phys_to_pfn(phys), type, alloc);
}
phys += next - addr;
@@ -805,14 +815,15 @@ static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
unsigned long end, phys_addr_t phys,
- const struct mem_type *type)
+ const struct mem_type *type,
+ void *(*alloc)(unsigned long sz))
{
pud_t *pud = pud_offset(pgd, addr);
unsigned long next;
do {
next = pud_addr_end(addr, end);
- alloc_init_pmd(pud, addr, next, phys, type);
+ alloc_init_pmd(pud, addr, next, phys, type, alloc);
phys += next - addr;
} while (pud++, addr = next, addr != end);
}
@@ -877,7 +888,8 @@ static void __init create_36bit_mapping(struct mm_struct *mm,
}
#endif /* !CONFIG_ARM_LPAE */
-static void __init __create_mapping(struct mm_struct *mm, struct map_desc *md)
+static void __init __create_mapping(struct mm_struct *mm, struct map_desc *md,
+ void *(*alloc)(unsigned long sz))
{
unsigned long addr, length, end;
phys_addr_t phys;
@@ -911,7 +923,7 @@ static void __init __create_mapping(struct mm_struct *mm, struct map_desc *md)
do {
unsigned long next = pgd_addr_end(addr, end);
- alloc_init_pud(pgd, addr, next, phys, type);
+ alloc_init_pud(pgd, addr, next, phys, type, alloc);
phys += next - addr;
addr = next;
@@ -940,7 +952,7 @@ static void __init create_mapping(struct map_desc *md)
(long long)__pfn_to_phys((u64)md->pfn), md->virtual);
}
- __create_mapping(&init_mm, md);
+ __create_mapping(&init_mm, md, early_alloc);
}
/*