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author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-03-05 15:46:18 -0500 |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-03-05 15:46:18 -0500 |
commit | 3fa04ecd72780da31ba8b329e148179bc24a9c7d (patch) | |
tree | f5d462fd4aee086952d18f159f737c450ab46b3b /arch/sh/include/asm/pgtable-3level.h | |
parent | 180b62a3d837613fcac3ce89576526423926c3c3 (diff) | |
parent | 1cda707d52e51a6cafac0aef12d2bd7052d572e6 (diff) |
Merge branch 'writeback-for-2.6.34' into nfs-for-2.6.34
Diffstat (limited to 'arch/sh/include/asm/pgtable-3level.h')
-rw-r--r-- | arch/sh/include/asm/pgtable-3level.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/sh/include/asm/pgtable-3level.h b/arch/sh/include/asm/pgtable-3level.h new file mode 100644 index 00000000000..249a985d964 --- /dev/null +++ b/arch/sh/include/asm/pgtable-3level.h @@ -0,0 +1,56 @@ +#ifndef __ASM_SH_PGTABLE_3LEVEL_H +#define __ASM_SH_PGTABLE_3LEVEL_H + +#include <asm-generic/pgtable-nopud.h> + +/* + * Some cores need a 3-level page table layout, for example when using + * 64-bit PTEs and 4K pages. + */ +#define PAGETABLE_LEVELS 3 + +#define PTE_MAGNITUDE 3 /* 64-bit PTEs on SH-X2 TLB */ + +/* PGD bits */ +#define PGDIR_SHIFT 30 + +#define PTRS_PER_PGD 4 +#define USER_PTRS_PER_PGD 2 + +/* PMD bits */ +#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - PTE_MAGNITUDE)) +#define PMD_SIZE (1UL << PMD_SHIFT) +#define PMD_MASK (~(PMD_SIZE-1)) + +#define PTRS_PER_PMD ((1 << PGDIR_SHIFT) / PMD_SIZE) + +#define pmd_ERROR(e) \ + printk("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e)) + +typedef struct { unsigned long long pmd; } pmd_t; +#define pmd_val(x) ((x).pmd) +#define __pmd(x) ((pmd_t) { (x) } ) + +static inline unsigned long pud_page_vaddr(pud_t pud) +{ + return pud_val(pud); +} + +#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) +static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) +{ + return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); +} + +#define pud_none(x) (!pud_val(x)) +#define pud_present(x) (pud_val(x)) +#define pud_clear(xp) do { set_pud(xp, __pud(0)); } while (0) +#define pud_bad(x) (pud_val(x) & ~PAGE_MASK) + +/* + * (puds are folded into pgds so this doesn't get actually called, + * but the define is needed for a generic inline function.) + */ +#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0) + +#endif /* __ASM_SH_PGTABLE_3LEVEL_H */ |