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[PATCH] ppc32: Allow adjust of pfn offset in pte

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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>
This commit is contained in:
Kumar Gala 2005-04-16 15:24:21 -07:00 committed by Linus Torvalds
parent a85f6d4aca
commit b464fce5ed
1 changed files with 7 additions and 2 deletions
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9
include/asm-ppc/pgtable.h
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@ -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)
/*