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authorFranck Bui-Huu <fbuihuu@gmail.com>2007-01-10 09:44:05 +0100
committerRalf Baechle <ralf@linux-mips.org>2007-02-06 16:53:13 +0000
commit6f284a2ce7b8bc49cb8455b1763357897a899abb (patch)
treeabf59702fad617780f59594aa8939db7ec4c76d6 /include/asm-mips/io.h
parentdb84dc61552ae0d198a8133d28b80c3838930ba8 (diff)
downloadop-kernel-dev-6f284a2ce7b8bc49cb8455b1763357897a899abb.zip
op-kernel-dev-6f284a2ce7b8bc49cb8455b1763357897a899abb.tar.gz
[MIPS] FLATMEM: introduce PHYS_OFFSET.
The old code was assuming that min_low_pfn was always 0. This means that platforms having a big hole at their memory start paid the price of wasting some memory for the allocation of unused entries in mem_map[]. This patch prevents this waste. It introduces PHYS_OFFSET define which is the start of the physical memory and uses it wherever needed. Specially when converting physical/virtual addresses into virtual/physical ones. Currently all platforms defines PHYS_OFFSET to 0. Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'include/asm-mips/io.h')
-rw-r--r--include/asm-mips/io.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h
index d77b657..67f0810 100644
--- a/include/asm-mips/io.h
+++ b/include/asm-mips/io.h
@@ -115,7 +115,7 @@ static inline void set_io_port_base(unsigned long base)
*/
static inline unsigned long virt_to_phys(volatile const void *address)
{
- return (unsigned long)address - PAGE_OFFSET;
+ return (unsigned long)address - PAGE_OFFSET + PHYS_OFFSET;
}
/*
@@ -132,7 +132,7 @@ static inline unsigned long virt_to_phys(volatile const void *address)
*/
static inline void * phys_to_virt(unsigned long address)
{
- return (void *)(address + PAGE_OFFSET);
+ return (void *)(address + PAGE_OFFSET - PHYS_OFFSET);
}
/*
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