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author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-05-03 12:20:29 +0100 |
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committer | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-05-03 12:20:29 +0100 |
commit | 5c3073e691b56dabbdec60dda4258b4e50d64872 (patch) | |
tree | 073b46c9cb83d8e2a8e73e18849e79d193108ad2 /include/asm-arm/pgtable.h | |
parent | 5cd0c3442021fbf39c7152b341a952aa24054be9 (diff) | |
download | kernel_samsung_smdk4412-5c3073e691b56dabbdec60dda4258b4e50d64872.zip kernel_samsung_smdk4412-5c3073e691b56dabbdec60dda4258b4e50d64872.tar.gz kernel_samsung_smdk4412-5c3073e691b56dabbdec60dda4258b4e50d64872.tar.bz2 |
[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.h | 17 |
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 |