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| author | Franck Bui-Huu <fbuihuu@gmail.com> | 2007-01-10 09:44:05 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-02-06 16:53:13 +0000 |
| commit | 6f284a2ce7b8bc49cb8455b1763357897a899abb (patch) | |
| tree | abf59702fad617780f59594aa8939db7ec4c76d6 /include/asm-mips/io.h | |
| parent | db84dc61552ae0d198a8133d28b80c3838930ba8 (diff) | |
| download | linux-3.10-6f284a2ce7b8bc49cb8455b1763357897a899abb.tar.gz linux-3.10-6f284a2ce7b8bc49cb8455b1763357897a899abb.tar.bz2 linux-3.10-6f284a2ce7b8bc49cb8455b1763357897a899abb.zip | |
[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.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-mips/io.h b/include/asm-mips/io.h index d77b657c09c..67f08107890 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); } /* |