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| author | Kumar Gala <galak@freescale.com> | 2005-04-16 15:24:21 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:24:21 -0700 |
| commit | b464fce5edc08a825907e9d48a2d2f1af0393fef (patch) | |
| tree | e92083cc989a20d363bfb4de438098a30e8f3843 /include/asm-ppc | |
| parent | a85f6d4aca822acdb49d27c44519cd6514b06a1d (diff) | |
| download | linux-b464fce5edc08a825907e9d48a2d2f1af0393fef.tar.gz linux-b464fce5edc08a825907e9d48a2d2f1af0393fef.tar.bz2 linux-b464fce5edc08a825907e9d48a2d2f1af0393fef.zip | |
[PATCH] ppc32: Allow adjust of pfn offset in pte
Allow the pfn to be offset by more than just PAGE_SHIFT in the pte. Today,
PAGE_SHIFT tends to allow us to have 12-bits of flags in the pte. In the
future if we have a larger pte we can allocate more bits for flags by
offsetting the pfn even further.
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-ppc')
| -rw-r--r-- | include/asm-ppc/pgtable.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h index 2e88cd9feffe..e135b4aba9fc 100644 --- a/include/asm-ppc/pgtable.h +++ b/include/asm-ppc/pgtable.h @@ -431,10 +431,15 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void); * Conversions between PTE values and page frame numbers. */ -#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) +/* in some case we want to additionaly adjust where the pfn is in the pte to + * allow room for more flags */ +#define PFN_SHIFT_OFFSET (PAGE_SHIFT) + +#define pte_pfn(x) (pte_val(x) >> PFN_SHIFT_OFFSET) #define pte_page(x) pfn_to_page(pte_pfn(x)) -#define pfn_pte(pfn, prot) __pte(((pte_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) +#define pfn_pte(pfn, prot) __pte(((pte_basic_t)(pfn) << PFN_SHIFT_OFFSET) |\ + pgprot_val(prot)) #define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot) /* |