[PATCH] ARM: Add top_pmd, which points at the top-most page table

Signed-off-by: Russell King <rmk@arm.linux.org.uk>

2 files changed, 7 insertions, 0 deletions

diff --git a/arch/arm/mm/mm-armv.c b/arch/arm/mm/mm-armv.c
index 2a514b05cd5c..fa60fd65fcf8 100644
--- a/arch/arm/mm/mm-armv.c
+++ b/arch/arm/mm/mm-armv.c
@@ -37,6 +37,8 @@ pgprot_t pgprot_kernel;
 
 EXPORT_SYMBOL(pgprot_kernel);
 
+pmd_t *top_pmd;
+
 struct cachepolicy {
         const char      policy[16];
         unsigned int    cr_mask;
@@ -682,6 +684,8 @@ void __init memtable_init(struct meminfo *mi)
 
         flush_cache_all();
         flush_tlb_all();
+
+        top_pmd = pmd_off_k(VECTORS_HIGH);
 }
 
 /*
diff --git a/include/asm-arm/page.h b/include/asm-arm/page.h
index 4ca3a8e9348f..d26d1574d972 100644
--- a/include/asm-arm/page.h
+++ b/include/asm-arm/page.h
@@ -171,6 +171,9 @@ typedef unsigned long pgprot_t;
 
 #endif /* STRICT_MM_TYPECHECKS */
 
+/* the upper-most page table pointer */
+extern pmd_t *top_pmd;
+
 /* Pure 2^n version of get_order */
 static inline int get_order(unsigned long size)
 {