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ARM: add support for non-global kernel mappings 

Add support to the kernel translation table population routines for
creating non-global mappings. This will be used by the UEFI runtime
services, which will use temporary mappings in the userland range.

Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Ard Biesheuvel 2015-11-17 08:46:47 +01:00 committed by ard
parent f579b2b104
commit b430e55b23
1 changed files with 20 additions and 15 deletions
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35
arch/arm/mm/mmu.c
View File

@ -745,18 +745,20 @@ static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr,
static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
unsigned long end, unsigned long pfn,
const struct mem_type *type,
void *(*alloc)(unsigned long sz))
void *(*alloc)(unsigned long sz),
bool ng)
{
pte_t *pte = pte_alloc(pmd, addr, type->prot_l1, alloc);
do {
set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)), 0);
set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)),
ng ? PTE_EXT_NG : 0);
pfn++;
} while (pte++, addr += PAGE_SIZE, addr != end);
}
static void __init __map_init_section(pmd_t *pmd, unsigned long addr,
unsigned long end, phys_addr_t phys,
const struct mem_type *type)
const struct mem_type *type, bool ng)
{
pmd_t *p = pmd;
@ -774,7 +776,7 @@ static void __init __map_init_section(pmd_t *pmd, unsigned long addr,
pmd++;
#endif
do {
*pmd = __pmd(phys | type->prot_sect);
*pmd = __pmd(phys | type->prot_sect | (ng ? PMD_SECT_nG : 0));
phys += SECTION_SIZE;
} while (pmd++, addr += SECTION_SIZE, addr != end);
@ -784,7 +786,7 @@ 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,
void *(*alloc)(unsigned long sz))
void *(*alloc)(unsigned long sz), bool ng)
{
pmd_t *pmd = pmd_offset(pud, addr);
unsigned long next;
@ -802,10 +804,10 @@ static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
*/
if (type->prot_sect &&
((addr | next | phys) & ~SECTION_MASK) == 0) {
__map_init_section(pmd, addr, next, phys, type);
__map_init_section(pmd, addr, next, phys, type, ng);
} else {
alloc_init_pte(pmd, addr, next,
__phys_to_pfn(phys), type, alloc);
__phys_to_pfn(phys), type, alloc, ng);
}
phys += next - addr;
@ -816,14 +818,14 @@ 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,
void *(*alloc)(unsigned long sz))
void *(*alloc)(unsigned long sz), bool ng)
{
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);
alloc_init_pmd(pud, addr, next, phys, type, alloc, ng);
phys += next - addr;
} while (pud++, addr = next, addr != end);
}
@ -831,7 +833,8 @@ static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
#ifndef CONFIG_ARM_LPAE
static void __init create_36bit_mapping(struct mm_struct *mm,
struct map_desc *md,
const struct mem_type *type)
const struct mem_type *type,
bool ng)
{
unsigned long addr, length, end;
phys_addr_t phys;
@ -879,7 +882,8 @@ static void __init create_36bit_mapping(struct mm_struct *mm,
int i;
for (i = 0; i < 16; i++)
*pmd++ = __pmd(phys | type->prot_sect | PMD_SECT_SUPER);
*pmd++ = __pmd(phys | type->prot_sect | PMD_SECT_SUPER |
(ng ? PMD_SECT_nG : 0));
addr += SUPERSECTION_SIZE;
phys += SUPERSECTION_SIZE;
@ -889,7 +893,8 @@ 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,
void *(*alloc)(unsigned long sz))
void *(*alloc)(unsigned long sz),
bool ng)
{
unsigned long addr, length, end;
phys_addr_t phys;
@ -903,7 +908,7 @@ static void __init __create_mapping(struct mm_struct *mm, struct map_desc *md,
* Catch 36-bit addresses
*/
if (md->pfn >= 0x100000) {
create_36bit_mapping(mm, md, type);
create_36bit_mapping(mm, md, type, ng);
return;
}
#endif
@ -923,7 +928,7 @@ 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);
alloc_init_pud(pgd, addr, next, phys, type, alloc, ng);
phys += next - addr;
addr = next;
@ -952,7 +957,7 @@ static void __init create_mapping(struct map_desc *md)
(long long)__pfn_to_phys((u64)md->pfn), md->virtual);
}
__create_mapping(&init_mm, md, early_alloc);
__create_mapping(&init_mm, md, early_alloc, false);
}
/*