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[MIPS] FLATMEM: introduce PHYS_OFFSET.

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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>
This commit is contained in:
Franck Bui-Huu
2007-01-10 09:44:05 +01:00
committed by Ralf Baechle
parent db84dc6155
commit 6f284a2ce7
3 changed files with 31 additions and 10 deletions
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4
include/asm-mips/io.h
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@@ -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);
}
/*