From: Kumar Gala <[email protected]>
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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
25-akpm/include/asm-ppc/pgtable.h | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)
diff -puN include/asm-ppc/pgtable.h~ppc32-allow-adjust-of-pfn-offset-in-pte include/asm-ppc/pgtable.h
--- 25/include/asm-ppc/pgtable.h~ppc32-allow-adjust-of-pfn-offset-in-pte 2005-04-12 03:21:11.573377480 -0700
+++ 25-akpm/include/asm-ppc/pgtable.h 2005-04-12 03:21:11.576377024 -0700
@@ -431,10 +431,15 @@ extern unsigned long bad_call_to_PMD_PAG
* 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)
/*
_
-
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