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| author |   Steven J. Hill <Steven.Hill@imgtec.com> | 2015-02-26 18:16:38 -0600 |
|---|---|---|
| committer |   Ralf Baechle <ralf@linux-mips.org> | 2015-03-19 17:39:49 +0100 |
| commit | c5b367835cfc7a8ef53b9670a409ffcc95194344 (patch) | |
| tree | 23a6be89021f93b09bb0f2340bc995c21bcab79b /arch/mips/include/asm/pgtable.h | |
| parent | MIPS: Rearrange PTE bits into fixed positions. (diff) | |
| download | linux-dev-c5b367835cfc7a8ef53b9670a409ffcc95194344.tar.xz linux-dev-c5b367835cfc7a8ef53b9670a409ffcc95194344.zip | |
MIPS: Add support for XPA.
Add support for extended physical addressing (XPA) so that
32-bit platforms can access equal to or greater than 40 bits
of physical addresses.
NOTE:
1) XPA and EVA are not the same and cannot be used
simultaneously.
2) If you configure your kernel for XPA, the PTEs
and all address sizes become 64-bit.
3) Your platform MUST have working HIGHMEM support.
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9355/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include/asm/pgtable.h')
| -rw-r--r-- | arch/mips/include/asm/pgtable.h | 36 |
1 files changed, 14 insertions, 22 deletions
diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h index e1fec0237ce2..bffd46ca3694 100644 --- a/arch/mips/include/asm/pgtable.h +++ b/arch/mips/include/asm/pgtable.h @@ -133,7 +133,7 @@ extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) -#define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL)) +#define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL)) #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT) static inline void set_pte(pte_t *ptep, pte_t pte) @@ -142,16 +142,14 @@ static inline void set_pte(pte_t *ptep, pte_t pte) smp_wmb(); ptep->pte_low = pte.pte_low; - if (pte.pte_low & _PAGE_GLOBAL) { + if (pte.pte_high & _PAGE_GLOBAL) { pte_t *buddy = ptep_buddy(ptep); /* * Make sure the buddy is global too (if it's !none, * it better already be global) */ - if (pte_none(*buddy)) { - buddy->pte_low |= _PAGE_GLOBAL; + if (pte_none(*buddy)) buddy->pte_high |= _PAGE_GLOBAL; - } } } @@ -161,8 +159,8 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *pt htw_stop(); /* Preserve global status for the pair */ - if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL) - null.pte_low = null.pte_high = _PAGE_GLOBAL; + if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL) + null.pte_high = _PAGE_GLOBAL; set_pte_at(mm, addr, ptep, null); htw_start(); @@ -242,21 +240,21 @@ static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; } static inline pte_t pte_wrprotect(pte_t pte) { - pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE); + pte.pte_low &= ~_PAGE_WRITE; pte.pte_high &= ~_PAGE_SILENT_WRITE; return pte; } static inline pte_t pte_mkclean(pte_t pte) { - pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE); + pte.pte_low &= ~_PAGE_MODIFIED; pte.pte_high &= ~_PAGE_SILENT_WRITE; return pte; } static inline pte_t pte_mkold(pte_t pte) { - pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ); + pte.pte_low &= ~_PAGE_ACCESSED; pte.pte_high &= ~_PAGE_SILENT_READ; return pte; } @@ -264,30 +262,24 @@ static inline pte_t pte_mkold(pte_t pte) static inline pte_t pte_mkwrite(pte_t pte) { pte.pte_low |= _PAGE_WRITE; - if (pte.pte_low & _PAGE_MODIFIED) { - pte.pte_low |= _PAGE_SILENT_WRITE; + if (pte.pte_low & _PAGE_MODIFIED) pte.pte_high |= _PAGE_SILENT_WRITE; - } return pte; } static inline pte_t pte_mkdirty(pte_t pte) { pte.pte_low |= _PAGE_MODIFIED; - if (pte.pte_low & _PAGE_WRITE) { - pte.pte_low |= _PAGE_SILENT_WRITE; + if (pte.pte_low & _PAGE_WRITE) pte.pte_high |= _PAGE_SILENT_WRITE; - } return pte; } static inline pte_t pte_mkyoung(pte_t pte) { pte.pte_low |= _PAGE_ACCESSED; - if (pte.pte_low & _PAGE_READ) { - pte.pte_low |= _PAGE_SILENT_READ; + if (pte.pte_low & _PAGE_READ) pte.pte_high |= _PAGE_SILENT_READ; - } return pte; } #else @@ -391,10 +383,10 @@ static inline pgprot_t pgprot_writecombine(pgprot_t _prot) #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { - pte.pte_low &= _PAGE_CHG_MASK; + pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK); pte.pte_high &= (_PFN_MASK | _CACHE_MASK); - pte.pte_low |= pgprot_val(newprot); - pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK); + pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK; + pte.pte_high |= pgprot_val(newprot) & ~_PFN_MASK; return pte; } #else |