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>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/arm/mm/mm.h b/arch/arm/mm/mm.h
index 70f6d3ea4834..6ee1ff2c1da6 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);