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| author | Paul Mundt <lethal@linux-sh.org> | 2009-07-22 16:50:57 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-07-22 16:50:57 +0900 |
| commit | c0b96cf639aa1bfa8983f734d4225091aa813e00 (patch) | |
| tree | d4b58d370379700157d0e34226a50956ec0362c9 | |
| parent | fc6cca3917e6594eb93c0b5e2226342eab175041 (diff) | |
| download | linux-stable-c0b96cf639aa1bfa8983f734d4225091aa813e00.tar.gz linux-stable-c0b96cf639aa1bfa8983f734d4225091aa813e00.tar.bz2 linux-stable-c0b96cf639aa1bfa8983f734d4225091aa813e00.zip | |
sh: Provide _PAGE_SPECIAL for 32-bit.
Allocate one of the unused PTE bits for _PAGE_SPECIAL directly. This is
prep work for fast gup and the zero page revival.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
| -rw-r--r-- | arch/sh/include/asm/pgtable_32.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/sh/include/asm/pgtable_32.h b/arch/sh/include/asm/pgtable_32.h index 72ea209195bd..0db19db913c7 100644 --- a/arch/sh/include/asm/pgtable_32.h +++ b/arch/sh/include/asm/pgtable_32.h @@ -20,7 +20,7 @@ * - Bit 9 is reserved by everyone and used by _PAGE_PROTNONE. * * - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages. - * Bit 10 is used for _PAGE_ACCESSED, bit 11 remains unused. + * Bit 10 is used for _PAGE_ACCESSED, and bit 11 is used for _PAGE_SPECIAL. * * - On 29 bit platforms, bits 31 to 29 are used for the space attributes * and timing control which (together with bit 0) are moved into the @@ -52,6 +52,7 @@ #define _PAGE_PROTNONE 0x200 /* software: if not present */ #define _PAGE_ACCESSED 0x400 /* software: page referenced */ #define _PAGE_FILE _PAGE_WT /* software: pagecache or swap? */ +#define _PAGE_SPECIAL 0x800 /* software: special page */ #define _PAGE_SZ_MASK (_PAGE_SZ0 | _PAGE_SZ1) #define _PAGE_PR_MASK (_PAGE_RW | _PAGE_USER) @@ -148,8 +149,12 @@ # define _PAGE_SZHUGE (_PAGE_FLAGS_HARD) #endif +/* + * Mask of bits that are to be preserved accross pgprot changes. + */ #define _PAGE_CHG_MASK \ - (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY) + (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | \ + _PAGE_DIRTY | _PAGE_SPECIAL) #ifndef __ASSEMBLY__ @@ -328,7 +333,7 @@ static inline void set_pte(pte_t *ptep, pte_t pte) #define pte_dirty(pte) ((pte).pte_low & _PAGE_DIRTY) #define pte_young(pte) ((pte).pte_low & _PAGE_ACCESSED) #define pte_file(pte) ((pte).pte_low & _PAGE_FILE) -#define pte_special(pte) (0) +#define pte_special(pte) ((pte).pte_low & _PAGE_SPECIAL) #ifdef CONFIG_X2TLB #define pte_write(pte) ((pte).pte_high & _PAGE_EXT_USER_WRITE) @@ -358,8 +363,9 @@ PTE_BIT_FUNC(low, mkclean, &= ~_PAGE_DIRTY); PTE_BIT_FUNC(low, mkdirty, |= _PAGE_DIRTY); PTE_BIT_FUNC(low, mkold, &= ~_PAGE_ACCESSED); PTE_BIT_FUNC(low, mkyoung, |= _PAGE_ACCESSED); +PTE_BIT_FUNC(low, mkspecial, |= _PAGE_SPECIAL); -static inline pte_t pte_mkspecial(pte_t pte) { return pte; } +#define __HAVE_ARCH_PTE_SPECIAL /* * Macro and implementation to make a page protection as uncachable. |