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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-05-03 12:20:29 +0100
committerRussell King <rmk@dyn-67.arm.linux.org.uk>2005-05-03 12:20:29 +0100
commit5c3073e691b56dabbdec60dda4258b4e50d64872 (patch)
tree073b46c9cb83d8e2a8e73e18849e79d193108ad2 /include/asm-arm/pgtable.h
parent5cd0c3442021fbf39c7152b341a952aa24054be9 (diff)
downloadop-kernel-dev-5c3073e691b56dabbdec60dda4258b4e50d64872.zip
op-kernel-dev-5c3073e691b56dabbdec60dda4258b4e50d64872.tar.gz
[PATCH] ARM: cleanup vmalloc start/offset macros
VMALLOC_START and VMALLOC_OFFSET are common between all ARM machine classes. Move them into include/asm-arm/pgtable.h, but allow a machine class to override them if required. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Diffstat (limited to 'include/asm-arm/pgtable.h')
-rw-r--r--include/asm-arm/pgtable.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/asm-arm/pgtable.h b/include/asm-arm/pgtable.h
index 2df4eac..a9892eb 100644
--- a/include/asm-arm/pgtable.h
+++ b/include/asm-arm/pgtable.h
@@ -17,6 +17,23 @@
#include <asm/arch/vmalloc.h>
/*
+ * Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 8MB value just means that there will be a 8MB "hole" after the
+ * physical memory until the kernel virtual memory starts. That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ *
+ * Note that platforms may override VMALLOC_START, but they must provide
+ * VMALLOC_END. VMALLOC_END defines the (exclusive) limit of this space,
+ * which may not overlap IO space.
+ */
+#ifndef VMALLOC_START
+#define VMALLOC_OFFSET (8*1024*1024)
+#define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#endif
+
+/*
* Hardware-wise, we have a two level page table structure, where the first
* level has 4096 entries, and the second level has 256 entries. Each entry
* is one 32-bit word. Most of the bits in the second level entry are used
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