Commit | Line | Data |
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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 | */ | |
adca6dc2 | 47 | #ifndef CONFIG_THUMB2_KERNEL |
d73cd428 | 48 | #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) |
adca6dc2 CM |
49 | #else |
50 | /* smaller range for Thumb-2 symbols relocation (2^24)*/ | |
51 | #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024) | |
52 | #endif | |
53 | ||
ab4f2ee1 | 54 | #if TASK_SIZE > MODULES_VADDR |
002547b4 RK |
55 | #error Top of user space clashes with start of module space |
56 | #endif | |
57 | ||
d73cd428 NP |
58 | /* |
59 | * The highmem pkmap virtual space shares the end of the module area. | |
60 | */ | |
61 | #ifdef CONFIG_HIGHMEM | |
62 | #define MODULES_END (PAGE_OFFSET - PMD_SIZE) | |
63 | #else | |
64 | #define MODULES_END (PAGE_OFFSET) | |
65 | #endif | |
66 | ||
002547b4 RK |
67 | /* |
68 | * The XIP kernel gets mapped at the bottom of the module vm area. | |
69 | * Since we use sections to map it, this macro replaces the physical address | |
70 | * with its virtual address while keeping offset from the base section. | |
71 | */ | |
ab4f2ee1 | 72 | #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) |
002547b4 | 73 | |
ff0daca5 | 74 | /* |
a069c896 | 75 | * Allow 16MB-aligned ioremap pages |
ff0daca5 | 76 | */ |
a069c896 | 77 | #define IOREMAP_MAX_ORDER 24 |
ff0daca5 | 78 | |
a7bd08c8 FB |
79 | /* |
80 | * Size of DMA-consistent memory region. Must be multiple of 2M, | |
81 | * between 2MB and 14MB inclusive. | |
82 | */ | |
83 | #ifndef CONSISTENT_DMA_SIZE | |
84 | #define CONSISTENT_DMA_SIZE SZ_2M | |
85 | #endif | |
86 | ||
87 | #define CONSISTENT_END (0xffe00000UL) | |
88 | #define CONSISTENT_BASE (CONSISTENT_END - CONSISTENT_DMA_SIZE) | |
89 | ||
002547b4 RK |
90 | #else /* CONFIG_MMU */ |
91 | ||
92 | /* | |
93 | * The limitation of user task size can grow up to the end of free ram region. | |
94 | * It is difficult to define and perhaps will never meet the original meaning | |
95 | * of this define that was meant to. | |
96 | * Fortunately, there is no reference for this in noMMU mode, for now. | |
97 | */ | |
98 | #ifndef TASK_SIZE | |
99 | #define TASK_SIZE (CONFIG_DRAM_SIZE) | |
100 | #endif | |
101 | ||
102 | #ifndef TASK_UNMAPPED_BASE | |
103 | #define TASK_UNMAPPED_BASE UL(0x00000000) | |
104 | #endif | |
105 | ||
106 | #ifndef PHYS_OFFSET | |
c931b4f6 | 107 | #define PHYS_OFFSET UL(CONFIG_DRAM_BASE) |
002547b4 RK |
108 | #endif |
109 | ||
110 | #ifndef END_MEM | |
c931b4f6 | 111 | #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) |
002547b4 RK |
112 | #endif |
113 | ||
114 | #ifndef PAGE_OFFSET | |
115 | #define PAGE_OFFSET (PHYS_OFFSET) | |
116 | #endif | |
117 | ||
118 | /* | |
119 | * The module can be at any place in ram in nommu mode. | |
120 | */ | |
ab4f2ee1 RK |
121 | #define MODULES_END (END_MEM) |
122 | #define MODULES_VADDR (PHYS_OFFSET) | |
002547b4 RK |
123 | |
124 | #endif /* !CONFIG_MMU */ | |
125 | ||
1dbd30e9 LW |
126 | /* |
127 | * We fix the TCM memories max 32 KiB ITCM resp DTCM at these | |
128 | * locations | |
129 | */ | |
130 | #ifdef CONFIG_HAVE_TCM | |
131 | #define ITCM_OFFSET UL(0xfffe0000) | |
132 | #define DTCM_OFFSET UL(0xfffe8000) | |
133 | #endif | |
134 | ||
1da177e4 LT |
135 | /* |
136 | * Physical vs virtual RAM address space conversion. These are | |
137 | * private definitions which should NOT be used outside memory.h | |
138 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. | |
139 | */ | |
a8cf81ff | 140 | #ifndef __virt_to_phys |
1da177e4 LT |
141 | #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) |
142 | #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) | |
a8cf81ff | 143 | #endif |
1da177e4 | 144 | |
9d4ae727 DS |
145 | /* |
146 | * Convert a physical address to a Page Frame Number and back | |
147 | */ | |
148 | #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT) | |
149 | #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) | |
150 | ||
719301ff RK |
151 | /* |
152 | * Convert a page to/from a physical address | |
153 | */ | |
154 | #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) | |
155 | #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) | |
156 | ||
1da177e4 LT |
157 | #ifndef __ASSEMBLY__ |
158 | ||
159 | /* | |
160 | * The DMA mask corresponding to the maximum bus address allocatable | |
161 | * using GFP_DMA. The default here places no restriction on DMA | |
162 | * allocations. This must be the smallest DMA mask in the system, | |
163 | * so a successful GFP_DMA allocation will always satisfy this. | |
164 | */ | |
165 | #ifndef ISA_DMA_THRESHOLD | |
166 | #define ISA_DMA_THRESHOLD (0xffffffffULL) | |
167 | #endif | |
168 | ||
169 | #ifndef arch_adjust_zones | |
b65b4781 | 170 | #define arch_adjust_zones(size,holes) do { } while (0) |
3bca103a NP |
171 | #elif !defined(CONFIG_ZONE_DMA) |
172 | #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA" | |
1da177e4 LT |
173 | #endif |
174 | ||
175 | /* | |
176 | * PFNs are used to describe any physical page; this means | |
177 | * PFN 0 == physical address 0. | |
178 | * | |
179 | * This is the PFN of the first RAM page in the kernel | |
180 | * direct-mapped view. We assume this is the first page | |
181 | * of RAM in the mem_map as well. | |
182 | */ | |
183 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
184 | ||
185 | /* | |
186 | * These are *only* valid on the kernel direct mapped RAM memory. | |
187 | * Note: Drivers should NOT use these. They are the wrong | |
188 | * translation for translating DMA addresses. Use the driver | |
189 | * DMA support - see dma-mapping.h. | |
190 | */ | |
05b112ff | 191 | static inline unsigned long virt_to_phys(const volatile void *x) |
1da177e4 LT |
192 | { |
193 | return __virt_to_phys((unsigned long)(x)); | |
194 | } | |
195 | ||
196 | static inline void *phys_to_virt(unsigned long x) | |
197 | { | |
198 | return (void *)(__phys_to_virt((unsigned long)(x))); | |
199 | } | |
200 | ||
201 | /* | |
202 | * Drivers should NOT use these either. | |
203 | */ | |
204 | #define __pa(x) __virt_to_phys((unsigned long)(x)) | |
205 | #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) | |
31a5539e | 206 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
1da177e4 LT |
207 | |
208 | /* | |
209 | * Virtual <-> DMA view memory address translations | |
210 | * Again, these are *only* valid on the kernel direct mapped RAM | |
211 | * memory. Use of these is *deprecated* (and that doesn't mean | |
212 | * use the __ prefixed forms instead.) See dma-mapping.h. | |
213 | */ | |
b5ee9002 NP |
214 | #ifndef __virt_to_bus |
215 | #define __virt_to_bus __virt_to_phys | |
216 | #define __bus_to_virt __phys_to_virt | |
1c4a4f48 RK |
217 | #define __pfn_to_bus(x) __pfn_to_phys(x) |
218 | #define __bus_to_pfn(x) __phys_to_pfn(x) | |
b5ee9002 NP |
219 | #endif |
220 | ||
1da177e4 LT |
221 | static inline __deprecated unsigned long virt_to_bus(void *x) |
222 | { | |
223 | return __virt_to_bus((unsigned long)x); | |
224 | } | |
225 | ||
226 | static inline __deprecated void *bus_to_virt(unsigned long x) | |
227 | { | |
228 | return (void *)__bus_to_virt(x); | |
229 | } | |
230 | ||
231 | /* | |
232 | * Conversion between a struct page and a physical address. | |
233 | * | |
234 | * Note: when converting an unknown physical address to a | |
235 | * struct page, the resulting pointer must be validated | |
236 | * using VALID_PAGE(). It must return an invalid struct page | |
237 | * for any physical address not corresponding to a system | |
238 | * RAM address. | |
239 | * | |
240 | * page_to_pfn(page) convert a struct page * to a PFN number | |
241 | * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * | |
1da177e4 LT |
242 | * |
243 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
244 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
245 | */ | |
7d129637 | 246 | #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET |
05944d74 | 247 | |
7d129637 | 248 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
1da177e4 LT |
249 | #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) |
250 | ||
23759dc6 LB |
251 | /* |
252 | * Optional coherency support. Currently used only by selected | |
253 | * Intel XSC3-based systems. | |
254 | */ | |
255 | #ifndef arch_is_coherent | |
256 | #define arch_is_coherent() 0 | |
257 | #endif | |
258 | ||
1da177e4 LT |
259 | #endif |
260 | ||
7eb98a2f KH |
261 | #include <asm-generic/memory_model.h> |
262 | ||
1da177e4 | 263 | #endif |