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1da177e4 | 1 | /* |
4baa9922 | 2 | * arch/arm/include/asm/memory.h |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2000-2002 Russell King | |
002547b4 | 5 | * modification for nommu, Hyok S. Choi, 2004 |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * Note: this file should not be included by non-asm/.h files | |
12 | */ | |
13 | #ifndef __ASM_ARM_MEMORY_H | |
14 | #define __ASM_ARM_MEMORY_H | |
15 | ||
8d5796d2 LB |
16 | #include <linux/compiler.h> |
17 | #include <linux/const.h> | |
18 | #include <mach/memory.h> | |
19 | #include <asm/sizes.h> | |
20 | ||
f09b9979 NP |
21 | /* |
22 | * Allow for constants defined here to be used from assembly code | |
23 | * by prepending the UL suffix only with actual C code compilation. | |
24 | */ | |
8d5796d2 | 25 | #define UL(x) _AC(x, UL) |
1da177e4 | 26 | |
002547b4 RK |
27 | #ifdef CONFIG_MMU |
28 | ||
1da177e4 | 29 | /* |
8d5796d2 | 30 | * PAGE_OFFSET - the virtual address of the start of the kernel image |
1da177e4 LT |
31 | * TASK_SIZE - the maximum size of a user space task. |
32 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area | |
33 | */ | |
8d5796d2 LB |
34 | #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) |
35 | #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000)) | |
36 | #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3) | |
1da177e4 LT |
37 | |
38 | /* | |
39 | * The maximum size of a 26-bit user space task. | |
40 | */ | |
f09b9979 | 41 | #define TASK_SIZE_26 UL(0x04000000) |
1da177e4 | 42 | |
002547b4 RK |
43 | /* |
44 | * The module space lives between the addresses given by TASK_SIZE | |
45 | * and PAGE_OFFSET - it must be within 32MB of the kernel text. | |
46 | */ | |
47 | #define MODULE_END (PAGE_OFFSET) | |
48 | #define MODULE_START (MODULE_END - 16*1048576) | |
49 | ||
50 | #if TASK_SIZE > MODULE_START | |
51 | #error Top of user space clashes with start of module space | |
52 | #endif | |
53 | ||
54 | /* | |
55 | * The XIP kernel gets mapped at the bottom of the module vm area. | |
56 | * Since we use sections to map it, this macro replaces the physical address | |
57 | * with its virtual address while keeping offset from the base section. | |
58 | */ | |
59 | #define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff)) | |
60 | ||
ff0daca5 | 61 | /* |
a069c896 | 62 | * Allow 16MB-aligned ioremap pages |
ff0daca5 | 63 | */ |
a069c896 | 64 | #define IOREMAP_MAX_ORDER 24 |
ff0daca5 | 65 | |
002547b4 RK |
66 | #else /* CONFIG_MMU */ |
67 | ||
68 | /* | |
69 | * The limitation of user task size can grow up to the end of free ram region. | |
70 | * It is difficult to define and perhaps will never meet the original meaning | |
71 | * of this define that was meant to. | |
72 | * Fortunately, there is no reference for this in noMMU mode, for now. | |
73 | */ | |
74 | #ifndef TASK_SIZE | |
75 | #define TASK_SIZE (CONFIG_DRAM_SIZE) | |
76 | #endif | |
77 | ||
78 | #ifndef TASK_UNMAPPED_BASE | |
79 | #define TASK_UNMAPPED_BASE UL(0x00000000) | |
80 | #endif | |
81 | ||
82 | #ifndef PHYS_OFFSET | |
83 | #define PHYS_OFFSET (CONFIG_DRAM_BASE) | |
84 | #endif | |
85 | ||
86 | #ifndef END_MEM | |
87 | #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE) | |
88 | #endif | |
89 | ||
90 | #ifndef PAGE_OFFSET | |
91 | #define PAGE_OFFSET (PHYS_OFFSET) | |
92 | #endif | |
93 | ||
94 | /* | |
95 | * The module can be at any place in ram in nommu mode. | |
96 | */ | |
97 | #define MODULE_END (END_MEM) | |
98 | #define MODULE_START (PHYS_OFFSET) | |
99 | ||
100 | #endif /* !CONFIG_MMU */ | |
101 | ||
37134cd5 KH |
102 | /* |
103 | * Size of DMA-consistent memory region. Must be multiple of 2M, | |
104 | * between 2MB and 14MB inclusive. | |
105 | */ | |
106 | #ifndef CONSISTENT_DMA_SIZE | |
107 | #define CONSISTENT_DMA_SIZE SZ_2M | |
108 | #endif | |
109 | ||
1da177e4 LT |
110 | /* |
111 | * Physical vs virtual RAM address space conversion. These are | |
112 | * private definitions which should NOT be used outside memory.h | |
113 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. | |
114 | */ | |
115 | #ifndef __virt_to_phys | |
116 | #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) | |
117 | #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) | |
118 | #endif | |
119 | ||
9d4ae727 DS |
120 | /* |
121 | * Convert a physical address to a Page Frame Number and back | |
122 | */ | |
123 | #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) | |
124 | #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) | |
125 | ||
1da177e4 LT |
126 | #ifndef __ASSEMBLY__ |
127 | ||
128 | /* | |
129 | * The DMA mask corresponding to the maximum bus address allocatable | |
130 | * using GFP_DMA. The default here places no restriction on DMA | |
131 | * allocations. This must be the smallest DMA mask in the system, | |
132 | * so a successful GFP_DMA allocation will always satisfy this. | |
133 | */ | |
134 | #ifndef ISA_DMA_THRESHOLD | |
135 | #define ISA_DMA_THRESHOLD (0xffffffffULL) | |
136 | #endif | |
137 | ||
138 | #ifndef arch_adjust_zones | |
139 | #define arch_adjust_zones(node,size,holes) do { } while (0) | |
3bca103a NP |
140 | #elif !defined(CONFIG_ZONE_DMA) |
141 | #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA" | |
1da177e4 LT |
142 | #endif |
143 | ||
144 | /* | |
145 | * PFNs are used to describe any physical page; this means | |
146 | * PFN 0 == physical address 0. | |
147 | * | |
148 | * This is the PFN of the first RAM page in the kernel | |
149 | * direct-mapped view. We assume this is the first page | |
150 | * of RAM in the mem_map as well. | |
151 | */ | |
152 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
153 | ||
154 | /* | |
155 | * These are *only* valid on the kernel direct mapped RAM memory. | |
156 | * Note: Drivers should NOT use these. They are the wrong | |
157 | * translation for translating DMA addresses. Use the driver | |
158 | * DMA support - see dma-mapping.h. | |
159 | */ | |
160 | static inline unsigned long virt_to_phys(void *x) | |
161 | { | |
162 | return __virt_to_phys((unsigned long)(x)); | |
163 | } | |
164 | ||
165 | static inline void *phys_to_virt(unsigned long x) | |
166 | { | |
167 | return (void *)(__phys_to_virt((unsigned long)(x))); | |
168 | } | |
169 | ||
170 | /* | |
171 | * Drivers should NOT use these either. | |
172 | */ | |
173 | #define __pa(x) __virt_to_phys((unsigned long)(x)) | |
174 | #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) | |
31a5539e | 175 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
1da177e4 LT |
176 | |
177 | /* | |
178 | * Virtual <-> DMA view memory address translations | |
179 | * Again, these are *only* valid on the kernel direct mapped RAM | |
180 | * memory. Use of these is *deprecated* (and that doesn't mean | |
181 | * use the __ prefixed forms instead.) See dma-mapping.h. | |
182 | */ | |
183 | static inline __deprecated unsigned long virt_to_bus(void *x) | |
184 | { | |
185 | return __virt_to_bus((unsigned long)x); | |
186 | } | |
187 | ||
188 | static inline __deprecated void *bus_to_virt(unsigned long x) | |
189 | { | |
190 | return (void *)__bus_to_virt(x); | |
191 | } | |
192 | ||
193 | /* | |
194 | * Conversion between a struct page and a physical address. | |
195 | * | |
196 | * Note: when converting an unknown physical address to a | |
197 | * struct page, the resulting pointer must be validated | |
198 | * using VALID_PAGE(). It must return an invalid struct page | |
199 | * for any physical address not corresponding to a system | |
200 | * RAM address. | |
201 | * | |
202 | * page_to_pfn(page) convert a struct page * to a PFN number | |
203 | * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * | |
204 | * pfn_valid(pfn) indicates whether a PFN number is valid | |
205 | * | |
206 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
207 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
208 | */ | |
209 | #ifndef CONFIG_DISCONTIGMEM | |
b7dc96d7 | 210 | |
7d129637 | 211 | #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET |
05944d74 RK |
212 | |
213 | #ifndef CONFIG_SPARSEMEM | |
1da177e4 | 214 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) |
05944d74 | 215 | #endif |
1da177e4 | 216 | |
7d129637 | 217 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
1da177e4 LT |
218 | #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) |
219 | ||
220 | #define PHYS_TO_NID(addr) (0) | |
221 | ||
222 | #else /* CONFIG_DISCONTIGMEM */ | |
223 | ||
224 | /* | |
225 | * This is more complex. We have a set of mem_map arrays spread | |
226 | * around in memory. | |
227 | */ | |
228 | #include <linux/numa.h> | |
b7dc96d7 | 229 | |
7d129637 | 230 | #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn) |
0da32350 | 231 | #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT) |
1b3cb73f RK |
232 | |
233 | #define pfn_valid(pfn) \ | |
234 | ({ \ | |
235 | unsigned int nid = PFN_TO_NID(pfn); \ | |
236 | int valid = nid < MAX_NUMNODES; \ | |
237 | if (valid) { \ | |
238 | pg_data_t *node = NODE_DATA(nid); \ | |
239 | valid = (pfn - node->node_start_pfn) < \ | |
240 | node->node_spanned_pages; \ | |
241 | } \ | |
242 | valid; \ | |
243 | }) | |
1da177e4 LT |
244 | |
245 | #define virt_to_page(kaddr) \ | |
246 | (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) | |
1b3cb73f | 247 | |
1da177e4 LT |
248 | #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES) |
249 | ||
250 | /* | |
251 | * Common discontigmem stuff. | |
252 | * PHYS_TO_NID is used by the ARM kernel/setup.c | |
253 | */ | |
254 | #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) | |
255 | ||
b7dc96d7 RK |
256 | /* |
257 | * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory | |
258 | * and returns the mem_map of that node. | |
259 | */ | |
260 | #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr)) | |
261 | ||
262 | /* | |
263 | * Given a page frame number, find the owning node of the memory | |
264 | * and returns the mem_map of that node. | |
265 | */ | |
266 | #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn)) | |
267 | ||
268 | #ifdef NODE_MEM_SIZE_BITS | |
269 | #define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1) | |
270 | ||
271 | /* | |
272 | * Given a kernel address, find the home node of the underlying memory. | |
273 | */ | |
274 | #define KVADDR_TO_NID(addr) \ | |
275 | (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS) | |
276 | ||
277 | /* | |
278 | * Given a page frame number, convert it to a node id. | |
279 | */ | |
280 | #define PFN_TO_NID(pfn) \ | |
281 | (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT)) | |
282 | ||
283 | /* | |
284 | * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory | |
285 | * and returns the index corresponding to the appropriate page in the | |
286 | * node's mem_map. | |
287 | */ | |
288 | #define LOCAL_MAP_NR(addr) \ | |
289 | (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT) | |
290 | ||
291 | #endif /* NODE_MEM_SIZE_BITS */ | |
292 | ||
1da177e4 LT |
293 | #endif /* !CONFIG_DISCONTIGMEM */ |
294 | ||
295 | /* | |
296 | * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. | |
297 | */ | |
298 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
299 | ||
23759dc6 LB |
300 | /* |
301 | * Optional coherency support. Currently used only by selected | |
302 | * Intel XSC3-based systems. | |
303 | */ | |
304 | #ifndef arch_is_coherent | |
305 | #define arch_is_coherent() 0 | |
306 | #endif | |
307 | ||
1da177e4 LT |
308 | #endif |
309 | ||
7eb98a2f KH |
310 | #include <asm-generic/memory_model.h> |
311 | ||
1da177e4 | 312 | #endif |