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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2009-08-17 20:02:06 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-08-17 20:02:06 +0100 |
| commit | 65cec8e3db606608fd1f8dfc4a1c7c37bfba9173 (patch) | |
| tree | b1e0ecd6380afa2286fffada08cddbd388640343 /arch/arm/include/asm/pgtable.h | |
| parent | 369842658a36bcea28ecb643ba4bdb53919330dd (diff) | |
| download | blackbird-obmc-linux-65cec8e3db606608fd1f8dfc4a1c7c37bfba9173.tar.gz blackbird-obmc-linux-65cec8e3db606608fd1f8dfc4a1c7c37bfba9173.zip | |
ARM: implement highpte
Add the ARM implementation of highpte, which allows PTE tables to be
placed in highmem. Unfortunately, we do not offer highpte support
when support for L2 cache is enabled.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/pgtable.h')
| -rw-r--r-- | arch/arm/include/asm/pgtable.h | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 9655bce3d345..201ccaa11f61 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -262,10 +262,19 @@ extern struct page *empty_zero_page; #define pte_clear(mm,addr,ptep) set_pte_ext(ptep, __pte(0), 0) #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) -#define pte_offset_map(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) -#define pte_offset_map_nested(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr)) -#define pte_unmap(pte) do { } while (0) -#define pte_unmap_nested(pte) do { } while (0) + +#define pte_offset_map(dir,addr) (__pte_map(dir, KM_PTE0) + __pte_index(addr)) +#define pte_offset_map_nested(dir,addr) (__pte_map(dir, KM_PTE1) + __pte_index(addr)) +#define pte_unmap(pte) __pte_unmap(pte, KM_PTE0) +#define pte_unmap_nested(pte) __pte_unmap(pte, KM_PTE1) + +#ifndef CONFIG_HIGHPTE +#define __pte_map(dir,km) pmd_page_vaddr(*(dir)) +#define __pte_unmap(pte,km) do { } while (0) +#else +#define __pte_map(dir,km) ((pte_t *)kmap_atomic(pmd_page(*(dir)), km) + PTRS_PER_PTE) +#define __pte_unmap(pte,km) kunmap_atomic((pte - PTRS_PER_PTE), km) +#endif #define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,pte,ext) |
