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