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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>
This commit is contained in:
Paul Mundt 2009-07-22 16:50:57 +09:00
parent fc6cca3917
commit c0b96cf639
1 changed files with 10 additions and 4 deletions
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14
arch/sh/include/asm/pgtable_32.h
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@ -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.