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1da177e4 LT |
1 | /* |
2 | * linux/include/asm-arm/memory.h | |
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 | ||
f09b9979 NP |
16 | /* |
17 | * Allow for constants defined here to be used from assembly code | |
18 | * by prepending the UL suffix only with actual C code compilation. | |
19 | */ | |
20 | #ifndef __ASSEMBLY__ | |
21 | #define UL(x) (x##UL) | |
22 | #else | |
23 | #define UL(x) (x) | |
24 | #endif | |
25 | ||
1da177e4 LT |
26 | #include <linux/compiler.h> |
27 | #include <asm/arch/memory.h> | |
37134cd5 | 28 | #include <asm/sizes.h> |
1da177e4 | 29 | |
002547b4 RK |
30 | #ifdef CONFIG_MMU |
31 | ||
1da177e4 LT |
32 | #ifndef TASK_SIZE |
33 | /* | |
34 | * TASK_SIZE - the maximum size of a user space task. | |
35 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area | |
36 | */ | |
f09b9979 NP |
37 | #define TASK_SIZE UL(0xbf000000) |
38 | #define TASK_UNMAPPED_BASE UL(0x40000000) | |
1da177e4 LT |
39 | #endif |
40 | ||
41 | /* | |
42 | * The maximum size of a 26-bit user space task. | |
43 | */ | |
f09b9979 | 44 | #define TASK_SIZE_26 UL(0x04000000) |
1da177e4 LT |
45 | |
46 | /* | |
47 | * Page offset: 3GB | |
48 | */ | |
49 | #ifndef PAGE_OFFSET | |
f09b9979 | 50 | #define PAGE_OFFSET UL(0xc0000000) |
1da177e4 LT |
51 | #endif |
52 | ||
002547b4 RK |
53 | /* |
54 | * The module space lives between the addresses given by TASK_SIZE | |
55 | * and PAGE_OFFSET - it must be within 32MB of the kernel text. | |
56 | */ | |
57 | #define MODULE_END (PAGE_OFFSET) | |
58 | #define MODULE_START (MODULE_END - 16*1048576) | |
59 | ||
60 | #if TASK_SIZE > MODULE_START | |
61 | #error Top of user space clashes with start of module space | |
62 | #endif | |
63 | ||
64 | /* | |
65 | * The XIP kernel gets mapped at the bottom of the module vm area. | |
66 | * Since we use sections to map it, this macro replaces the physical address | |
67 | * with its virtual address while keeping offset from the base section. | |
68 | */ | |
69 | #define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff)) | |
70 | ||
ff0daca5 | 71 | /* |
a069c896 | 72 | * Allow 16MB-aligned ioremap pages |
ff0daca5 | 73 | */ |
a069c896 | 74 | #define IOREMAP_MAX_ORDER 24 |
ff0daca5 | 75 | |
002547b4 RK |
76 | #else /* CONFIG_MMU */ |
77 | ||
78 | /* | |
79 | * The limitation of user task size can grow up to the end of free ram region. | |
80 | * It is difficult to define and perhaps will never meet the original meaning | |
81 | * of this define that was meant to. | |
82 | * Fortunately, there is no reference for this in noMMU mode, for now. | |
83 | */ | |
84 | #ifndef TASK_SIZE | |
85 | #define TASK_SIZE (CONFIG_DRAM_SIZE) | |
86 | #endif | |
87 | ||
88 | #ifndef TASK_UNMAPPED_BASE | |
89 | #define TASK_UNMAPPED_BASE UL(0x00000000) | |
90 | #endif | |
91 | ||
92 | #ifndef PHYS_OFFSET | |
93 | #define PHYS_OFFSET (CONFIG_DRAM_BASE) | |
94 | #endif | |
95 | ||
96 | #ifndef END_MEM | |
97 | #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE) | |
98 | #endif | |
99 | ||
100 | #ifndef PAGE_OFFSET | |
101 | #define PAGE_OFFSET (PHYS_OFFSET) | |
102 | #endif | |
103 | ||
104 | /* | |
105 | * The module can be at any place in ram in nommu mode. | |
106 | */ | |
107 | #define MODULE_END (END_MEM) | |
108 | #define MODULE_START (PHYS_OFFSET) | |
109 | ||
110 | #endif /* !CONFIG_MMU */ | |
111 | ||
37134cd5 KH |
112 | /* |
113 | * Size of DMA-consistent memory region. Must be multiple of 2M, | |
114 | * between 2MB and 14MB inclusive. | |
115 | */ | |
116 | #ifndef CONSISTENT_DMA_SIZE | |
117 | #define CONSISTENT_DMA_SIZE SZ_2M | |
118 | #endif | |
119 | ||
1da177e4 LT |
120 | /* |
121 | * Physical vs virtual RAM address space conversion. These are | |
122 | * private definitions which should NOT be used outside memory.h | |
123 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. | |
124 | */ | |
125 | #ifndef __virt_to_phys | |
126 | #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) | |
127 | #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) | |
128 | #endif | |
129 | ||
9d4ae727 DS |
130 | /* |
131 | * Convert a physical address to a Page Frame Number and back | |
132 | */ | |
133 | #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) | |
134 | #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) | |
135 | ||
1da177e4 LT |
136 | #ifndef __ASSEMBLY__ |
137 | ||
138 | /* | |
139 | * The DMA mask corresponding to the maximum bus address allocatable | |
140 | * using GFP_DMA. The default here places no restriction on DMA | |
141 | * allocations. This must be the smallest DMA mask in the system, | |
142 | * so a successful GFP_DMA allocation will always satisfy this. | |
143 | */ | |
144 | #ifndef ISA_DMA_THRESHOLD | |
145 | #define ISA_DMA_THRESHOLD (0xffffffffULL) | |
146 | #endif | |
147 | ||
148 | #ifndef arch_adjust_zones | |
149 | #define arch_adjust_zones(node,size,holes) do { } while (0) | |
150 | #endif | |
151 | ||
152 | /* | |
153 | * PFNs are used to describe any physical page; this means | |
154 | * PFN 0 == physical address 0. | |
155 | * | |
156 | * This is the PFN of the first RAM page in the kernel | |
157 | * direct-mapped view. We assume this is the first page | |
158 | * of RAM in the mem_map as well. | |
159 | */ | |
160 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
161 | ||
162 | /* | |
163 | * These are *only* valid on the kernel direct mapped RAM memory. | |
164 | * Note: Drivers should NOT use these. They are the wrong | |
165 | * translation for translating DMA addresses. Use the driver | |
166 | * DMA support - see dma-mapping.h. | |
167 | */ | |
168 | static inline unsigned long virt_to_phys(void *x) | |
169 | { | |
170 | return __virt_to_phys((unsigned long)(x)); | |
171 | } | |
172 | ||
173 | static inline void *phys_to_virt(unsigned long x) | |
174 | { | |
175 | return (void *)(__phys_to_virt((unsigned long)(x))); | |
176 | } | |
177 | ||
178 | /* | |
179 | * Drivers should NOT use these either. | |
180 | */ | |
181 | #define __pa(x) __virt_to_phys((unsigned long)(x)) | |
182 | #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) | |
31a5539e | 183 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
1da177e4 LT |
184 | |
185 | /* | |
186 | * Virtual <-> DMA view memory address translations | |
187 | * Again, these are *only* valid on the kernel direct mapped RAM | |
188 | * memory. Use of these is *deprecated* (and that doesn't mean | |
189 | * use the __ prefixed forms instead.) See dma-mapping.h. | |
190 | */ | |
191 | static inline __deprecated unsigned long virt_to_bus(void *x) | |
192 | { | |
193 | return __virt_to_bus((unsigned long)x); | |
194 | } | |
195 | ||
196 | static inline __deprecated void *bus_to_virt(unsigned long x) | |
197 | { | |
198 | return (void *)__bus_to_virt(x); | |
199 | } | |
200 | ||
201 | /* | |
202 | * Conversion between a struct page and a physical address. | |
203 | * | |
204 | * Note: when converting an unknown physical address to a | |
205 | * struct page, the resulting pointer must be validated | |
206 | * using VALID_PAGE(). It must return an invalid struct page | |
207 | * for any physical address not corresponding to a system | |
208 | * RAM address. | |
209 | * | |
210 | * page_to_pfn(page) convert a struct page * to a PFN number | |
211 | * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * | |
212 | * pfn_valid(pfn) indicates whether a PFN number is valid | |
213 | * | |
214 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
215 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
216 | */ | |
217 | #ifndef CONFIG_DISCONTIGMEM | |
b7dc96d7 | 218 | |
7d129637 | 219 | #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET |
05944d74 RK |
220 | |
221 | #ifndef CONFIG_SPARSEMEM | |
1da177e4 | 222 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) |
05944d74 | 223 | #endif |
1da177e4 | 224 | |
7d129637 | 225 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
1da177e4 LT |
226 | #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) |
227 | ||
228 | #define PHYS_TO_NID(addr) (0) | |
229 | ||
230 | #else /* CONFIG_DISCONTIGMEM */ | |
231 | ||
232 | /* | |
233 | * This is more complex. We have a set of mem_map arrays spread | |
234 | * around in memory. | |
235 | */ | |
236 | #include <linux/numa.h> | |
b7dc96d7 | 237 | |
7d129637 | 238 | #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn) |
0da32350 | 239 | #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT) |
1b3cb73f RK |
240 | |
241 | #define pfn_valid(pfn) \ | |
242 | ({ \ | |
243 | unsigned int nid = PFN_TO_NID(pfn); \ | |
244 | int valid = nid < MAX_NUMNODES; \ | |
245 | if (valid) { \ | |
246 | pg_data_t *node = NODE_DATA(nid); \ | |
247 | valid = (pfn - node->node_start_pfn) < \ | |
248 | node->node_spanned_pages; \ | |
249 | } \ | |
250 | valid; \ | |
251 | }) | |
1da177e4 LT |
252 | |
253 | #define virt_to_page(kaddr) \ | |
254 | (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) | |
1b3cb73f | 255 | |
1da177e4 LT |
256 | #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES) |
257 | ||
258 | /* | |
259 | * Common discontigmem stuff. | |
260 | * PHYS_TO_NID is used by the ARM kernel/setup.c | |
261 | */ | |
262 | #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) | |
263 | ||
b7dc96d7 RK |
264 | /* |
265 | * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory | |
266 | * and returns the mem_map of that node. | |
267 | */ | |
268 | #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr)) | |
269 | ||
270 | /* | |
271 | * Given a page frame number, find the owning node of the memory | |
272 | * and returns the mem_map of that node. | |
273 | */ | |
274 | #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn)) | |
275 | ||
276 | #ifdef NODE_MEM_SIZE_BITS | |
277 | #define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1) | |
278 | ||
279 | /* | |
280 | * Given a kernel address, find the home node of the underlying memory. | |
281 | */ | |
282 | #define KVADDR_TO_NID(addr) \ | |
283 | (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS) | |
284 | ||
285 | /* | |
286 | * Given a page frame number, convert it to a node id. | |
287 | */ | |
288 | #define PFN_TO_NID(pfn) \ | |
289 | (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT)) | |
290 | ||
291 | /* | |
292 | * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory | |
293 | * and returns the index corresponding to the appropriate page in the | |
294 | * node's mem_map. | |
295 | */ | |
296 | #define LOCAL_MAP_NR(addr) \ | |
297 | (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT) | |
298 | ||
299 | #endif /* NODE_MEM_SIZE_BITS */ | |
300 | ||
1da177e4 LT |
301 | #endif /* !CONFIG_DISCONTIGMEM */ |
302 | ||
303 | /* | |
304 | * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. | |
305 | */ | |
306 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
307 | ||
308 | /* | |
309 | * Optional device DMA address remapping. Do _not_ use directly! | |
310 | * We should really eliminate virt_to_bus() here - it's deprecated. | |
311 | */ | |
312 | #ifndef __arch_page_to_dma | |
313 | #define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page))) | |
314 | #define dma_to_virt(dev, addr) ((void *)__bus_to_virt(addr)) | |
315 | #define virt_to_dma(dev, addr) ((dma_addr_t)__virt_to_bus((unsigned long)(addr))) | |
316 | #else | |
317 | #define page_to_dma(dev, page) (__arch_page_to_dma(dev, page)) | |
318 | #define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr)) | |
319 | #define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr)) | |
320 | #endif | |
321 | ||
23759dc6 LB |
322 | /* |
323 | * Optional coherency support. Currently used only by selected | |
324 | * Intel XSC3-based systems. | |
325 | */ | |
326 | #ifndef arch_is_coherent | |
327 | #define arch_is_coherent() 0 | |
328 | #endif | |
329 | ||
1da177e4 LT |
330 | #endif |
331 | ||
7eb98a2f KH |
332 | #include <asm-generic/memory_model.h> |
333 | ||
1da177e4 | 334 | #endif |