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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-07-02 14:46:27 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-01-26 20:06:14 +0000
commitde27c308223dc9bd48de9742c7c2b53a15c1b012 (patch)
treed32acbc71110b1e727abd80620f95f14565b6031 /arch/arm/mm/mm.h
parentdcd6c92267155e70a94b3927bce681ce74b80d1f (diff)
downloadlinux-de27c308223dc9bd48de9742c7c2b53a15c1b012.tar.gz
ARM: pgtable: move TOP_PTE address definitions to arch/arm/mm/mm.h
Move the TOP_PTE address definitions to one central place so that it's easy to discover what they're being used for. This helps to ensure that there are no overlaps. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/mm.h')
-rw-r--r--arch/arm/mm/mm.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/mm/mm.h b/arch/arm/mm/mm.h
index 70f6d3ea483..6ee1ff2c1da 100644
--- a/arch/arm/mm/mm.h
+++ b/arch/arm/mm/mm.h
@@ -5,6 +5,19 @@ extern pmd_t *top_pmd;
#define TOP_PTE(x) pte_offset_kernel(top_pmd, x)
+/*
+ * 0xffff8000 to 0xffffffff is reserved for any ARM architecture
+ * specific hacks for copying pages efficiently, while 0xffff4000
+ * is reserved for VIPT aliasing flushing by generic code.
+ *
+ * Note that we don't allow VIPT aliasing caches with SMP.
+ */
+#define COPYPAGE_MINICACHE 0xffff8000
+#define COPYPAGE_V6_FROM 0xffff8000
+#define COPYPAGE_V6_TO 0xffffc000
+/* PFN alias flushing, for VIPT caches */
+#define FLUSH_ALIAS_START 0xffff4000
+
static inline pmd_t *pmd_off_k(unsigned long virt)
{
return pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);