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ARM: implement create_mapping_late() for EFI use 

This implements create_mapping_late(), which we will use to populate
the UEFI Runtime Services page tables.

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 2015-04-29 10:04:17 +02:00 committed by ard
parent b430e55b23
commit c7936206b9
2 changed files with 22 additions and 0 deletions
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2
arch/arm/include/asm/mach/map.h
View File

@ -42,6 +42,8 @@ enum {
extern void iotable_init(struct map_desc *, int); extern void iotable_init(struct map_desc *, int);
extern void vm_reserve_area_early(unsigned long addr, unsigned long size, extern void vm_reserve_area_early(unsigned long addr, unsigned long size,
void *caller); void *caller);
extern void create_mapping_late(struct mm_struct *mm, struct map_desc *md,
bool ng);
#ifdef CONFIG_DEBUG_LL #ifdef CONFIG_DEBUG_LL
extern void debug_ll_addr(unsigned long *paddr, unsigned long *vaddr); extern void debug_ll_addr(unsigned long *paddr, unsigned long *vaddr);

20
arch/arm/mm/mmu.c
View File

@ -724,6 +724,14 @@ static void __init *early_alloc(unsigned long sz)
return early_alloc_aligned(sz, sz); return early_alloc_aligned(sz, sz);
} }
static void *__init late_alloc(unsigned long sz)
{
void *ptr = (void *)__get_free_pages(PGALLOC_GFP, get_order(sz));
BUG_ON(!ptr);
return ptr;
}
static pte_t * __init pte_alloc(pmd_t *pmd, unsigned long addr, static pte_t * __init pte_alloc(pmd_t *pmd, unsigned long addr,
unsigned long prot, unsigned long prot,
void *(*alloc)(unsigned long sz)) void *(*alloc)(unsigned long sz))
@ -960,6 +968,18 @@ static void __init create_mapping(struct map_desc *md)
__create_mapping(&init_mm, md, early_alloc, false); __create_mapping(&init_mm, md, early_alloc, false);
} }
void __init create_mapping_late(struct mm_struct *mm, struct map_desc *md,
bool ng)
{
#ifdef CONFIG_ARM_LPAE
pud_t *pud = pud_alloc(mm, pgd_offset(mm, md->virtual), md->virtual);
if (WARN_ON(!pud))
return;
pmd_alloc(mm, pud, 0);
#endif
__create_mapping(mm, md, late_alloc, ng);
}
/* /*
* Create the architecture specific mappings * Create the architecture specific mappings
*/ */