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authorKumar Gala <galak@freescale.com>2005-04-16 15:24:21 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:24:21 -0700
commitb464fce5edc08a825907e9d48a2d2f1af0393fef (patch)
treee92083cc989a20d363bfb4de438098a30e8f3843
parenta85f6d4aca822acdb49d27c44519cd6514b06a1d (diff)
downloadop-kernel-dev-b464fce5edc08a825907e9d48a2d2f1af0393fef.zip
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[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>
-rw-r--r--include/asm-ppc/pgtable.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h
index 2e88cd9..e135b4a 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)
/*
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