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1 | /* |
2 | * linux/include/asm-arm/memory.h | |
3 | * | |
4 | * Copyright (C) 2000-2002 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * Note: this file should not be included by non-asm/.h files | |
11 | */ | |
12 | #ifndef __ASM_ARM_MEMORY_H | |
13 | #define __ASM_ARM_MEMORY_H | |
14 | ||
15 | #include <linux/config.h> | |
16 | #include <linux/compiler.h> | |
17 | #include <asm/arch/memory.h> | |
18 | ||
19 | #ifndef TASK_SIZE | |
20 | /* | |
21 | * TASK_SIZE - the maximum size of a user space task. | |
22 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area | |
23 | */ | |
24 | #define TASK_SIZE (0xbf000000UL) | |
25 | #define TASK_UNMAPPED_BASE (0x40000000UL) | |
26 | #endif | |
27 | ||
28 | /* | |
29 | * The maximum size of a 26-bit user space task. | |
30 | */ | |
31 | #define TASK_SIZE_26 (0x04000000UL) | |
32 | ||
33 | /* | |
34 | * Page offset: 3GB | |
35 | */ | |
36 | #ifndef PAGE_OFFSET | |
37 | #define PAGE_OFFSET (0xc0000000UL) | |
38 | #endif | |
39 | ||
40 | /* | |
41 | * Physical vs virtual RAM address space conversion. These are | |
42 | * private definitions which should NOT be used outside memory.h | |
43 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. | |
44 | */ | |
45 | #ifndef __virt_to_phys | |
46 | #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) | |
47 | #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) | |
48 | #endif | |
49 | ||
50 | /* | |
51 | * The module space lives between the addresses given by TASK_SIZE | |
52 | * and PAGE_OFFSET - it must be within 32MB of the kernel text. | |
53 | */ | |
54 | #define MODULE_END (PAGE_OFFSET) | |
55 | #define MODULE_START (MODULE_END - 16*1048576) | |
56 | ||
57 | #if TASK_SIZE > MODULE_START | |
58 | #error Top of user space clashes with start of module space | |
59 | #endif | |
60 | ||
61 | #ifndef __ASSEMBLY__ | |
62 | ||
63 | /* | |
64 | * The DMA mask corresponding to the maximum bus address allocatable | |
65 | * using GFP_DMA. The default here places no restriction on DMA | |
66 | * allocations. This must be the smallest DMA mask in the system, | |
67 | * so a successful GFP_DMA allocation will always satisfy this. | |
68 | */ | |
69 | #ifndef ISA_DMA_THRESHOLD | |
70 | #define ISA_DMA_THRESHOLD (0xffffffffULL) | |
71 | #endif | |
72 | ||
73 | #ifndef arch_adjust_zones | |
74 | #define arch_adjust_zones(node,size,holes) do { } while (0) | |
75 | #endif | |
76 | ||
77 | /* | |
78 | * PFNs are used to describe any physical page; this means | |
79 | * PFN 0 == physical address 0. | |
80 | * | |
81 | * This is the PFN of the first RAM page in the kernel | |
82 | * direct-mapped view. We assume this is the first page | |
83 | * of RAM in the mem_map as well. | |
84 | */ | |
85 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
86 | ||
87 | /* | |
88 | * These are *only* valid on the kernel direct mapped RAM memory. | |
89 | * Note: Drivers should NOT use these. They are the wrong | |
90 | * translation for translating DMA addresses. Use the driver | |
91 | * DMA support - see dma-mapping.h. | |
92 | */ | |
93 | static inline unsigned long virt_to_phys(void *x) | |
94 | { | |
95 | return __virt_to_phys((unsigned long)(x)); | |
96 | } | |
97 | ||
98 | static inline void *phys_to_virt(unsigned long x) | |
99 | { | |
100 | return (void *)(__phys_to_virt((unsigned long)(x))); | |
101 | } | |
102 | ||
103 | /* | |
104 | * Drivers should NOT use these either. | |
105 | */ | |
106 | #define __pa(x) __virt_to_phys((unsigned long)(x)) | |
107 | #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) | |
108 | ||
109 | /* | |
110 | * Virtual <-> DMA view memory address translations | |
111 | * Again, these are *only* valid on the kernel direct mapped RAM | |
112 | * memory. Use of these is *deprecated* (and that doesn't mean | |
113 | * use the __ prefixed forms instead.) See dma-mapping.h. | |
114 | */ | |
115 | static inline __deprecated unsigned long virt_to_bus(void *x) | |
116 | { | |
117 | return __virt_to_bus((unsigned long)x); | |
118 | } | |
119 | ||
120 | static inline __deprecated void *bus_to_virt(unsigned long x) | |
121 | { | |
122 | return (void *)__bus_to_virt(x); | |
123 | } | |
124 | ||
125 | /* | |
126 | * Conversion between a struct page and a physical address. | |
127 | * | |
128 | * Note: when converting an unknown physical address to a | |
129 | * struct page, the resulting pointer must be validated | |
130 | * using VALID_PAGE(). It must return an invalid struct page | |
131 | * for any physical address not corresponding to a system | |
132 | * RAM address. | |
133 | * | |
134 | * page_to_pfn(page) convert a struct page * to a PFN number | |
135 | * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * | |
136 | * pfn_valid(pfn) indicates whether a PFN number is valid | |
137 | * | |
138 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
139 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
140 | */ | |
141 | #ifndef CONFIG_DISCONTIGMEM | |
142 | ||
143 | #define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET) | |
144 | #define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET) | |
145 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) | |
146 | ||
147 | #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) | |
148 | #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) | |
149 | ||
150 | #define PHYS_TO_NID(addr) (0) | |
151 | ||
152 | #else /* CONFIG_DISCONTIGMEM */ | |
153 | ||
154 | /* | |
155 | * This is more complex. We have a set of mem_map arrays spread | |
156 | * around in memory. | |
157 | */ | |
158 | #include <linux/numa.h> | |
159 | ||
160 | #define page_to_pfn(page) \ | |
161 | (( (page) - page_zone(page)->zone_mem_map) \ | |
162 | + page_zone(page)->zone_start_pfn) | |
163 | #define pfn_to_page(pfn) \ | |
164 | (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT)) | |
165 | #define pfn_valid(pfn) (PFN_TO_NID(pfn) < MAX_NUMNODES) | |
166 | ||
167 | #define virt_to_page(kaddr) \ | |
168 | (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) | |
169 | #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES) | |
170 | ||
171 | /* | |
172 | * Common discontigmem stuff. | |
173 | * PHYS_TO_NID is used by the ARM kernel/setup.c | |
174 | */ | |
175 | #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) | |
176 | ||
177 | #endif /* !CONFIG_DISCONTIGMEM */ | |
178 | ||
179 | /* | |
180 | * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. | |
181 | */ | |
182 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
183 | ||
184 | /* | |
185 | * Optional device DMA address remapping. Do _not_ use directly! | |
186 | * We should really eliminate virt_to_bus() here - it's deprecated. | |
187 | */ | |
188 | #ifndef __arch_page_to_dma | |
189 | #define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page))) | |
190 | #define dma_to_virt(dev, addr) ((void *)__bus_to_virt(addr)) | |
191 | #define virt_to_dma(dev, addr) ((dma_addr_t)__virt_to_bus((unsigned long)(addr))) | |
192 | #else | |
193 | #define page_to_dma(dev, page) (__arch_page_to_dma(dev, page)) | |
194 | #define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr)) | |
195 | #define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr)) | |
196 | #endif | |
197 | ||
198 | #endif | |
199 | ||
200 | #endif |