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-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 2df4eacf4fa..a9892eb42a2 100644
--- a/include/asm-arm/pgtable.h
+++ b/include/asm-arm/pgtable.h
@@ -17,6 +17,23 @@
17#include <asm/arch/vmalloc.h> 17#include <asm/arch/vmalloc.h>
18 18
19/* 19/*
20 * Just any arbitrary offset to the start of the vmalloc VM area: the
21 * current 8MB value just means that there will be a 8MB "hole" after the
22 * physical memory until the kernel virtual memory starts. That means that
23 * any out-of-bounds memory accesses will hopefully be caught.
24 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
25 * area for the same reason. ;)
26 *
27 * Note that platforms may override VMALLOC_START, but they must provide
28 * VMALLOC_END. VMALLOC_END defines the (exclusive) limit of this space,
29 * which may not overlap IO space.
30 */
31#ifndef VMALLOC_START
32#define VMALLOC_OFFSET (8*1024*1024)
33#define VMALLOC_START (((unsigned long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
34#endif
35
36/*
20 * Hardware-wise, we have a two level page table structure, where the first 37 * Hardware-wise, we have a two level page table structure, where the first
21 * level has 4096 entries, and the second level has 256 entries. Each entry 38 * level has 4096 entries, and the second level has 256 entries. Each entry
22 * is one 32-bit word. Most of the bits in the second level entry are used 39 * is one 32-bit word. Most of the bits in the second level entry are used