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1da177e4 LT |
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 | ||
f09b9979 NP |
15 | /* |
16 | * Allow for constants defined here to be used from assembly code | |
17 | * by prepending the UL suffix only with actual C code compilation. | |
18 | */ | |
19 | #ifndef __ASSEMBLY__ | |
20 | #define UL(x) (x##UL) | |
21 | #else | |
22 | #define UL(x) (x) | |
23 | #endif | |
24 | ||
1da177e4 LT |
25 | #include <linux/config.h> |
26 | #include <linux/compiler.h> | |
27 | #include <asm/arch/memory.h> | |
37134cd5 | 28 | #include <asm/sizes.h> |
1da177e4 LT |
29 | |
30 | #ifndef TASK_SIZE | |
31 | /* | |
32 | * TASK_SIZE - the maximum size of a user space task. | |
33 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area | |
34 | */ | |
f09b9979 NP |
35 | #define TASK_SIZE UL(0xbf000000) |
36 | #define TASK_UNMAPPED_BASE UL(0x40000000) | |
1da177e4 LT |
37 | #endif |
38 | ||
39 | /* | |
40 | * The maximum size of a 26-bit user space task. | |
41 | */ | |
f09b9979 | 42 | #define TASK_SIZE_26 UL(0x04000000) |
1da177e4 LT |
43 | |
44 | /* | |
45 | * Page offset: 3GB | |
46 | */ | |
47 | #ifndef PAGE_OFFSET | |
f09b9979 | 48 | #define PAGE_OFFSET UL(0xc0000000) |
1da177e4 LT |
49 | #endif |
50 | ||
37134cd5 KH |
51 | /* |
52 | * Size of DMA-consistent memory region. Must be multiple of 2M, | |
53 | * between 2MB and 14MB inclusive. | |
54 | */ | |
55 | #ifndef CONSISTENT_DMA_SIZE | |
56 | #define CONSISTENT_DMA_SIZE SZ_2M | |
57 | #endif | |
58 | ||
1da177e4 LT |
59 | /* |
60 | * Physical vs virtual RAM address space conversion. These are | |
61 | * private definitions which should NOT be used outside memory.h | |
62 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. | |
63 | */ | |
64 | #ifndef __virt_to_phys | |
65 | #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) | |
66 | #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) | |
67 | #endif | |
68 | ||
9d4ae727 DS |
69 | /* |
70 | * Convert a physical address to a Page Frame Number and back | |
71 | */ | |
72 | #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) | |
73 | #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) | |
74 | ||
1da177e4 LT |
75 | /* |
76 | * The module space lives between the addresses given by TASK_SIZE | |
77 | * and PAGE_OFFSET - it must be within 32MB of the kernel text. | |
78 | */ | |
79 | #define MODULE_END (PAGE_OFFSET) | |
80 | #define MODULE_START (MODULE_END - 16*1048576) | |
81 | ||
82 | #if TASK_SIZE > MODULE_START | |
83 | #error Top of user space clashes with start of module space | |
84 | #endif | |
85 | ||
37d07b72 NP |
86 | /* |
87 | * The XIP kernel gets mapped at the bottom of the module vm area. | |
88 | * Since we use sections to map it, this macro replaces the physical address | |
89 | * with its virtual address while keeping offset from the base section. | |
90 | */ | |
91 | #define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff)) | |
92 | ||
1da177e4 LT |
93 | #ifndef __ASSEMBLY__ |
94 | ||
95 | /* | |
96 | * The DMA mask corresponding to the maximum bus address allocatable | |
97 | * using GFP_DMA. The default here places no restriction on DMA | |
98 | * allocations. This must be the smallest DMA mask in the system, | |
99 | * so a successful GFP_DMA allocation will always satisfy this. | |
100 | */ | |
101 | #ifndef ISA_DMA_THRESHOLD | |
102 | #define ISA_DMA_THRESHOLD (0xffffffffULL) | |
103 | #endif | |
104 | ||
105 | #ifndef arch_adjust_zones | |
106 | #define arch_adjust_zones(node,size,holes) do { } while (0) | |
107 | #endif | |
108 | ||
109 | /* | |
110 | * PFNs are used to describe any physical page; this means | |
111 | * PFN 0 == physical address 0. | |
112 | * | |
113 | * This is the PFN of the first RAM page in the kernel | |
114 | * direct-mapped view. We assume this is the first page | |
115 | * of RAM in the mem_map as well. | |
116 | */ | |
117 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
118 | ||
119 | /* | |
120 | * These are *only* valid on the kernel direct mapped RAM memory. | |
121 | * Note: Drivers should NOT use these. They are the wrong | |
122 | * translation for translating DMA addresses. Use the driver | |
123 | * DMA support - see dma-mapping.h. | |
124 | */ | |
125 | static inline unsigned long virt_to_phys(void *x) | |
126 | { | |
127 | return __virt_to_phys((unsigned long)(x)); | |
128 | } | |
129 | ||
130 | static inline void *phys_to_virt(unsigned long x) | |
131 | { | |
132 | return (void *)(__phys_to_virt((unsigned long)(x))); | |
133 | } | |
134 | ||
135 | /* | |
136 | * Drivers should NOT use these either. | |
137 | */ | |
138 | #define __pa(x) __virt_to_phys((unsigned long)(x)) | |
139 | #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) | |
31a5539e | 140 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
1da177e4 LT |
141 | |
142 | /* | |
143 | * Virtual <-> DMA view memory address translations | |
144 | * Again, these are *only* valid on the kernel direct mapped RAM | |
145 | * memory. Use of these is *deprecated* (and that doesn't mean | |
146 | * use the __ prefixed forms instead.) See dma-mapping.h. | |
147 | */ | |
148 | static inline __deprecated unsigned long virt_to_bus(void *x) | |
149 | { | |
150 | return __virt_to_bus((unsigned long)x); | |
151 | } | |
152 | ||
153 | static inline __deprecated void *bus_to_virt(unsigned long x) | |
154 | { | |
155 | return (void *)__bus_to_virt(x); | |
156 | } | |
157 | ||
158 | /* | |
159 | * Conversion between a struct page and a physical address. | |
160 | * | |
161 | * Note: when converting an unknown physical address to a | |
162 | * struct page, the resulting pointer must be validated | |
163 | * using VALID_PAGE(). It must return an invalid struct page | |
164 | * for any physical address not corresponding to a system | |
165 | * RAM address. | |
166 | * | |
167 | * page_to_pfn(page) convert a struct page * to a PFN number | |
168 | * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * | |
169 | * pfn_valid(pfn) indicates whether a PFN number is valid | |
170 | * | |
171 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
172 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
173 | */ | |
174 | #ifndef CONFIG_DISCONTIGMEM | |
175 | ||
176 | #define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET) | |
177 | #define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET) | |
178 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) | |
179 | ||
180 | #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) | |
181 | #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) | |
182 | ||
183 | #define PHYS_TO_NID(addr) (0) | |
184 | ||
185 | #else /* CONFIG_DISCONTIGMEM */ | |
186 | ||
187 | /* | |
188 | * This is more complex. We have a set of mem_map arrays spread | |
189 | * around in memory. | |
190 | */ | |
191 | #include <linux/numa.h> | |
192 | ||
193 | #define page_to_pfn(page) \ | |
194 | (( (page) - page_zone(page)->zone_mem_map) \ | |
195 | + page_zone(page)->zone_start_pfn) | |
1b3cb73f | 196 | |
1da177e4 LT |
197 | #define pfn_to_page(pfn) \ |
198 | (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT)) | |
1b3cb73f RK |
199 | |
200 | #define pfn_valid(pfn) \ | |
201 | ({ \ | |
202 | unsigned int nid = PFN_TO_NID(pfn); \ | |
203 | int valid = nid < MAX_NUMNODES; \ | |
204 | if (valid) { \ | |
205 | pg_data_t *node = NODE_DATA(nid); \ | |
206 | valid = (pfn - node->node_start_pfn) < \ | |
207 | node->node_spanned_pages; \ | |
208 | } \ | |
209 | valid; \ | |
210 | }) | |
1da177e4 LT |
211 | |
212 | #define virt_to_page(kaddr) \ | |
213 | (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) | |
1b3cb73f | 214 | |
1da177e4 LT |
215 | #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES) |
216 | ||
217 | /* | |
218 | * Common discontigmem stuff. | |
219 | * PHYS_TO_NID is used by the ARM kernel/setup.c | |
220 | */ | |
221 | #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) | |
222 | ||
223 | #endif /* !CONFIG_DISCONTIGMEM */ | |
224 | ||
225 | /* | |
226 | * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. | |
227 | */ | |
228 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
229 | ||
230 | /* | |
231 | * Optional device DMA address remapping. Do _not_ use directly! | |
232 | * We should really eliminate virt_to_bus() here - it's deprecated. | |
233 | */ | |
234 | #ifndef __arch_page_to_dma | |
235 | #define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page))) | |
236 | #define dma_to_virt(dev, addr) ((void *)__bus_to_virt(addr)) | |
237 | #define virt_to_dma(dev, addr) ((dma_addr_t)__virt_to_bus((unsigned long)(addr))) | |
238 | #else | |
239 | #define page_to_dma(dev, page) (__arch_page_to_dma(dev, page)) | |
240 | #define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr)) | |
241 | #define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr)) | |
242 | #endif | |
243 | ||
244 | #endif | |
245 | ||
246 | #endif |