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| author | Russell King <rmk@flint.arm.linux.org.uk> | 2004-06-12 22:13:21 +0100 |
|---|---|---|
| committer | Russell King <rmk@flint.arm.linux.org.uk> | 2004-06-12 22:13:21 +0100 |
| commit | d69c7369f473f8647b31693976dfb2a433ffaae9 (patch) | |
| tree | c3f517de9b54bea2d7e696936dbd4429fe75431b /Documentation | |
| parent | 5d0e9fbf19837b0cdad7573165ce555f3a6fd86d (diff) | |
| download | history-d69c7369f473f8647b31693976dfb2a433ffaae9.tar.gz | |
[ARM] Update ARM memory layout documentation.
This updates the memory layout documentation to indicate that certain
areas should remain unused. It also corrects a few minor errors with
region end addresses.
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/arm/memory.txt | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/Documentation/arm/memory.txt b/Documentation/arm/memory.txt index 967ce6c56a23e7..4b1c93a8177b9d 100644 --- a/Documentation/arm/memory.txt +++ b/Documentation/arm/memory.txt @@ -1,7 +1,7 @@ Kernel Memory Layout on ARM Linux Russell King <rmk@arm.linux.org.uk> - April 27, 2003 (2.5.68) + May 21, 2004 (2.6.6) This document describes the virtual memory layout which the Linux kernel uses for ARM processors. It indicates which regions are @@ -29,32 +29,30 @@ ffff0000 ffff0fff CPU vector page. CPU supports vector relocation (control register V bit.) -ffe00000 fffeffff Free for platform use, not recommended. +ffc00000 fffeffff DMA memory mapping region. Memory returned + by the dma_alloc_xxx functions will be + dynamically mapped here. -ffc00000 ffdfffff 2MB consistent memory mapping. - Memory returned by the consistent_alloc - low level function will be dynamically - mapped here. +ff000000 ffbfffff Reserved for future expansion of DMA + mapping region. -ff000000 ffbfffff Free for platform use, not recommended. +VMALLOC_END feffffff Free for platform use, recommended. -VMALLOC_END ff000000 Free for platform use, recommended. - -VMALLOC_START VMALLOC_END vmalloc() / ioremap() space. +VMALLOC_START VMALLOC_END-1 vmalloc() / ioremap() space. Memory returned by vmalloc/ioremap will be dynamically placed in this region. VMALLOC_START may be based upon the value of the high_memory variable. -PAGE_OFFSET high_memory Kernel direct-mapped RAM region. +PAGE_OFFSET high_memory-1 Kernel direct-mapped RAM region. This maps the platforms RAM, and typically maps all platform RAM in a 1:1 relationship. -TASK_SIZE PAGE_OFFSET Kernel module space +TASK_SIZE PAGE_OFFSET-1 Kernel module space Kernel modules inserted via insmod are placed here using dynamic mappings. -00001000 TASK_SIZE User space mappings +00001000 TASK_SIZE-1 User space mappings Per-thread mappings are placed here via the mmap() system call. |