[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>
This commit is contained in:
Родитель
a85f6d4aca
Коммит
b464fce5ed
|
@ -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)
|
||||
|
||||
/*
|
||||
|
|
Загрузка…
Ссылка в новой задаче