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authorFranck Bui-Huu <fbuihuu@gmail.com>2007-01-10 03:44:05 -0500
committerRalf Baechle <ralf@linux-mips.org>2007-02-06 11:53:13 -0500
commit6f284a2ce7b8bc49cb8455b1763357897a899abb (patch)
treeabf59702fad617780f59594aa8939db7ec4c76d6 /include/asm-mips/page.h
parentdb84dc61552ae0d198a8133d28b80c3838930ba8 (diff)
[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/page.h')
-rw-r--r--include/asm-mips/page.h25
1 files changed, 21 insertions, 4 deletions
diff --git a/include/asm-mips/page.h b/include/asm-mips/page.h
index 2f9e1a9ec51f..d3fbd83ff545 100644
--- a/include/asm-mips/page.h
+++ b/include/asm-mips/page.h
@@ -34,6 +34,20 @@
34 34
35#ifndef __ASSEMBLY__ 35#ifndef __ASSEMBLY__
36 36
37/*
38 * This gives the physical RAM offset.
39 */
40#ifndef PHYS_OFFSET
41#define PHYS_OFFSET 0UL
42#endif
43
44/*
45 * It's normally defined only for FLATMEM config but it's
46 * used in our early mem init code for all memory models.
47 * So always define it.
48 */
49#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
50
37#include <linux/pfn.h> 51#include <linux/pfn.h>
38#include <asm/io.h> 52#include <asm/io.h>
39 53
@@ -132,20 +146,23 @@ typedef struct { unsigned long pgprot; } pgprot_t;
132/* to align the pointer to the (next) page boundary */ 146/* to align the pointer to the (next) page boundary */
133#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK) 147#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
134 148
149/*
150 * __pa()/__va() should be used only during mem init.
151 */
135#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64) 152#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
136#define __pa_page_offset(x) ((unsigned long)(x) < CKSEG0 ? PAGE_OFFSET : CKSEG0) 153#define __pa_page_offset(x) ((unsigned long)(x) < CKSEG0 ? PAGE_OFFSET : CKSEG0)
137#else 154#else
138#define __pa_page_offset(x) PAGE_OFFSET 155#define __pa_page_offset(x) PAGE_OFFSET
139#endif 156#endif
140#define __pa(x) ((unsigned long)(x) - __pa_page_offset(x)) 157#define __pa(x) ((unsigned long)(x) - __pa_page_offset(x) + PHYS_OFFSET)
141#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0)) 158#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
142#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET)) 159#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0))
143 160
144#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 161#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
145 162
146#ifdef CONFIG_FLATMEM 163#ifdef CONFIG_FLATMEM
147 164
148#define pfn_valid(pfn) ((pfn) < max_mapnr) 165#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
149 166
150#elif defined(CONFIG_SPARSEMEM) 167#elif defined(CONFIG_SPARSEMEM)
151 168