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[MIPS] Fix non-linear memory mapping on MIPS 

Fix the non-linear memory mapping done via remap_file_pages() -- it
didn't work on any MIPS CPU because the page offset clashing with
_PAGE_FILE and some other page protection bits which should have been left
zeros for this kind of pages.
    
Signed-off-by: Konstantin Baydarov <kbaidarov@ru.mvista.com>
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Sergei Shtylyov 2006-05-27 22:39:39 +04:00 committed by Ralf Baechle
parent aa32374aaa
commit 7cb710c9a6
2 changed files with 31 additions and 27 deletions
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45
include/asm-mips/pgtable-32.h
View File

@ -177,16 +177,18 @@ pfn_pte(unsigned long pfn, pgprot_t prot)
((swp_entry_t) { ((type) << 10) | ((offset) << 15) })
/*
* Bits 0, 1, 2, 9 and 10 are taken, split up the 27 bits of offset
* into this range:
* Bits 0, 4, 8, and 9 are taken, split up 28 bits of offset into this range:
*/
#define PTE_FILE_MAX_BITS 27
#define PTE_FILE_MAX_BITS 28
#define pte_to_pgoff(_pte) \
((((_pte).pte >> 3) & 0x3f ) + (((_pte).pte >> 11) << 8 ))
#define pte_to_pgoff(_pte) ((((_pte).pte >> 1 ) & 0x07) | \
(((_pte).pte >> 2 ) & 0x38) | \
(((_pte).pte >> 10) << 6 ))
#define pgoff_to_pte(off) \
((pte_t) { (((off) & 0x3f) << 3) + (((off) >> 8) << 11) + _PAGE_FILE })
#define pgoff_to_pte(off) ((pte_t) { (((off) & 0x07) << 1 ) | \
(((off) & 0x38) << 2 ) | \
(((off) >> 6 ) << 10) | \
_PAGE_FILE })
#else
@ -203,24 +205,29 @@ pfn_pte(unsigned long pfn, pgprot_t prot)
((swp_entry_t) { ((type) << 8) | ((offset) << 13) })
#endif /* defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) */
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
/*
* Bits 0, 1, 2, 7 and 8 are taken, split up the 27 bits of offset
* into this range:
* Bits 0 and 1 of pte_high are taken, use the rest for the page offset...
*/
#define PTE_FILE_MAX_BITS 27
#define PTE_FILE_MAX_BITS 30
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
/* fixme */
#define pte_to_pgoff(_pte) (((_pte).pte_high >> 6) + ((_pte).pte_high & 0x3f))
#define pgoff_to_pte(off) \
((pte_t){(((off) & 0x3f) + ((off) << 6) + _PAGE_FILE)})
#define pte_to_pgoff(_pte) ((_pte).pte_high >> 2)
#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) << 2 })
#else
#define pte_to_pgoff(_pte) \
((((_pte).pte >> 3) & 0x1f ) + (((_pte).pte >> 9) << 6 ))
/*
* Bits 0, 4, 6, and 7 are taken, split up 28 bits of offset into this range:
*/
#define PTE_FILE_MAX_BITS 28
#define pgoff_to_pte(off) \
((pte_t) { (((off) & 0x1f) << 3) + (((off) >> 6) << 9) + _PAGE_FILE })
#define pte_to_pgoff(_pte) ((((_pte).pte >> 1) & 0x7) | \
(((_pte).pte >> 2) & 0x8) | \
(((_pte).pte >> 8) << 4))
#define pgoff_to_pte(off) ((pte_t) { (((off) & 0x7) << 1) | \
(((off) & 0x8) << 2) | \
(((off) >> 4) << 8) | \
_PAGE_FILE })
#endif
#endif

13
include/asm-mips/pgtable-64.h
View File

@ -224,15 +224,12 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
/*
* Bits 0, 1, 2, 7 and 8 are taken, split up the 32 bits of offset
* into this range:
* Bits 0, 4, 6, and 7 are taken. Let's leave bits 1, 2, 3, and 5 alone to
* make things easier, and only use the upper 56 bits for the page offset...
*/
#define PTE_FILE_MAX_BITS 32
#define PTE_FILE_MAX_BITS 56
#define pte_to_pgoff(_pte) \
((((_pte).pte >> 3) & 0x1f ) + (((_pte).pte >> 9) << 6 ))
#define pgoff_to_pte(off) \
((pte_t) { (((off) & 0x1f) << 3) + (((off) >> 6) << 9) + _PAGE_FILE })
#define pte_to_pgoff(_pte) ((_pte).pte >> 8)
#define pgoff_to_pte(off) ((pte_t) { ((off) << 8) | _PAGE_FILE })
#endif /* _ASM_PGTABLE_64_H */