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> | |
3a6b1676 | 18 | #include <linux/types.h> |
158e8bfe | 19 | #include <linux/sizes.h> |
8d5796d2 | 20 | |
0cdc8b92 | 21 | #ifdef CONFIG_NEED_MACH_MEMORY_H |
1b9f95f8 NP |
22 | #include <mach/memory.h> |
23 | #endif | |
24 | ||
f09b9979 NP |
25 | /* |
26 | * Allow for constants defined here to be used from assembly code | |
27 | * by prepending the UL suffix only with actual C code compilation. | |
28 | */ | |
8d5796d2 | 29 | #define UL(x) _AC(x, UL) |
1da177e4 | 30 | |
002547b4 RK |
31 | #ifdef CONFIG_MMU |
32 | ||
1da177e4 | 33 | /* |
8d5796d2 | 34 | * PAGE_OFFSET - the virtual address of the start of the kernel image |
1da177e4 LT |
35 | * TASK_SIZE - the maximum size of a user space task. |
36 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area | |
37 | */ | |
8d5796d2 LB |
38 | #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) |
39 | #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000)) | |
40 | #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3) | |
1da177e4 LT |
41 | |
42 | /* | |
43 | * The maximum size of a 26-bit user space task. | |
44 | */ | |
f09b9979 | 45 | #define TASK_SIZE_26 UL(0x04000000) |
1da177e4 | 46 | |
002547b4 RK |
47 | /* |
48 | * The module space lives between the addresses given by TASK_SIZE | |
49 | * and PAGE_OFFSET - it must be within 32MB of the kernel text. | |
50 | */ | |
adca6dc2 | 51 | #ifndef CONFIG_THUMB2_KERNEL |
d73cd428 | 52 | #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024) |
adca6dc2 CM |
53 | #else |
54 | /* smaller range for Thumb-2 symbols relocation (2^24)*/ | |
55 | #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024) | |
56 | #endif | |
57 | ||
ab4f2ee1 | 58 | #if TASK_SIZE > MODULES_VADDR |
002547b4 RK |
59 | #error Top of user space clashes with start of module space |
60 | #endif | |
61 | ||
d73cd428 NP |
62 | /* |
63 | * The highmem pkmap virtual space shares the end of the module area. | |
64 | */ | |
65 | #ifdef CONFIG_HIGHMEM | |
66 | #define MODULES_END (PAGE_OFFSET - PMD_SIZE) | |
67 | #else | |
68 | #define MODULES_END (PAGE_OFFSET) | |
69 | #endif | |
70 | ||
002547b4 RK |
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 | */ | |
ab4f2ee1 | 76 | #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) |
002547b4 | 77 | |
ff0daca5 | 78 | /* |
a069c896 | 79 | * Allow 16MB-aligned ioremap pages |
ff0daca5 | 80 | */ |
a069c896 | 81 | #define IOREMAP_MAX_ORDER 24 |
ff0daca5 | 82 | |
a7bd08c8 | 83 | #define CONSISTENT_END (0xffe00000UL) |
a7bd08c8 | 84 | |
002547b4 RK |
85 | #else /* CONFIG_MMU */ |
86 | ||
87 | /* | |
88 | * The limitation of user task size can grow up to the end of free ram region. | |
89 | * It is difficult to define and perhaps will never meet the original meaning | |
90 | * of this define that was meant to. | |
91 | * Fortunately, there is no reference for this in noMMU mode, for now. | |
92 | */ | |
93 | #ifndef TASK_SIZE | |
94 | #define TASK_SIZE (CONFIG_DRAM_SIZE) | |
95 | #endif | |
96 | ||
97 | #ifndef TASK_UNMAPPED_BASE | |
98 | #define TASK_UNMAPPED_BASE UL(0x00000000) | |
99 | #endif | |
100 | ||
101 | #ifndef PHYS_OFFSET | |
c931b4f6 | 102 | #define PHYS_OFFSET UL(CONFIG_DRAM_BASE) |
002547b4 RK |
103 | #endif |
104 | ||
105 | #ifndef END_MEM | |
c931b4f6 | 106 | #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) |
002547b4 RK |
107 | #endif |
108 | ||
109 | #ifndef PAGE_OFFSET | |
110 | #define PAGE_OFFSET (PHYS_OFFSET) | |
111 | #endif | |
112 | ||
113 | /* | |
114 | * The module can be at any place in ram in nommu mode. | |
115 | */ | |
ab4f2ee1 RK |
116 | #define MODULES_END (END_MEM) |
117 | #define MODULES_VADDR (PHYS_OFFSET) | |
002547b4 | 118 | |
38b4205a UKK |
119 | #define XIP_VIRT_ADDR(physaddr) (physaddr) |
120 | ||
002547b4 RK |
121 | #endif /* !CONFIG_MMU */ |
122 | ||
1dbd30e9 LW |
123 | /* |
124 | * We fix the TCM memories max 32 KiB ITCM resp DTCM at these | |
125 | * locations | |
126 | */ | |
127 | #ifdef CONFIG_HAVE_TCM | |
128 | #define ITCM_OFFSET UL(0xfffe0000) | |
129 | #define DTCM_OFFSET UL(0xfffe8000) | |
130 | #endif | |
131 | ||
9d4ae727 DS |
132 | /* |
133 | * Convert a physical address to a Page Frame Number and back | |
134 | */ | |
3a6b1676 WD |
135 | #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) |
136 | #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) | |
9d4ae727 | 137 | |
719301ff RK |
138 | /* |
139 | * Convert a page to/from a physical address | |
140 | */ | |
141 | #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) | |
142 | #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) | |
143 | ||
1da177e4 LT |
144 | #ifndef __ASSEMBLY__ |
145 | ||
dc21af99 RK |
146 | /* |
147 | * Physical vs virtual RAM address space conversion. These are | |
148 | * private definitions which should NOT be used outside memory.h | |
149 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. | |
150 | */ | |
151 | #ifndef __virt_to_phys | |
152 | #ifdef CONFIG_ARM_PATCH_PHYS_VIRT | |
153 | ||
cada3c08 RK |
154 | /* |
155 | * Constants used to force the right instruction encodings and shifts | |
156 | * so that all we need to do is modify the 8-bit constant field. | |
157 | */ | |
158 | #define __PV_BITS_31_24 0x81000000 | |
cada3c08 | 159 | |
dc21af99 RK |
160 | extern unsigned long __pv_phys_offset; |
161 | #define PHYS_OFFSET __pv_phys_offset | |
162 | ||
cada3c08 | 163 | #define __pv_stub(from,to,instr,type) \ |
dc21af99 RK |
164 | __asm__("@ __pv_stub\n" \ |
165 | "1: " instr " %0, %1, %2\n" \ | |
166 | " .pushsection .pv_table,\"a\"\n" \ | |
167 | " .long 1b\n" \ | |
168 | " .popsection\n" \ | |
169 | : "=r" (to) \ | |
cada3c08 | 170 | : "r" (from), "I" (type)) |
dc21af99 RK |
171 | |
172 | static inline unsigned long __virt_to_phys(unsigned long x) | |
173 | { | |
174 | unsigned long t; | |
cada3c08 | 175 | __pv_stub(x, t, "add", __PV_BITS_31_24); |
dc21af99 RK |
176 | return t; |
177 | } | |
178 | ||
179 | static inline unsigned long __phys_to_virt(unsigned long x) | |
180 | { | |
181 | unsigned long t; | |
cada3c08 | 182 | __pv_stub(x, t, "sub", __PV_BITS_31_24); |
dc21af99 RK |
183 | return t; |
184 | } | |
185 | #else | |
186 | #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) | |
187 | #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) | |
188 | #endif | |
189 | #endif | |
b4ad5155 | 190 | #endif /* __ASSEMBLY__ */ |
dc21af99 RK |
191 | |
192 | #ifndef PHYS_OFFSET | |
1b9f95f8 | 193 | #ifdef PLAT_PHYS_OFFSET |
dc21af99 | 194 | #define PHYS_OFFSET PLAT_PHYS_OFFSET |
1b9f95f8 NP |
195 | #else |
196 | #define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) | |
197 | #endif | |
dc21af99 RK |
198 | #endif |
199 | ||
b4ad5155 SB |
200 | #ifndef __ASSEMBLY__ |
201 | ||
1da177e4 LT |
202 | /* |
203 | * PFNs are used to describe any physical page; this means | |
204 | * PFN 0 == physical address 0. | |
205 | * | |
206 | * This is the PFN of the first RAM page in the kernel | |
207 | * direct-mapped view. We assume this is the first page | |
208 | * of RAM in the mem_map as well. | |
209 | */ | |
210 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
211 | ||
212 | /* | |
213 | * These are *only* valid on the kernel direct mapped RAM memory. | |
214 | * Note: Drivers should NOT use these. They are the wrong | |
215 | * translation for translating DMA addresses. Use the driver | |
216 | * DMA support - see dma-mapping.h. | |
217 | */ | |
3a6b1676 | 218 | static inline phys_addr_t virt_to_phys(const volatile void *x) |
1da177e4 LT |
219 | { |
220 | return __virt_to_phys((unsigned long)(x)); | |
221 | } | |
222 | ||
3a6b1676 | 223 | static inline void *phys_to_virt(phys_addr_t x) |
1da177e4 LT |
224 | { |
225 | return (void *)(__phys_to_virt((unsigned long)(x))); | |
226 | } | |
227 | ||
228 | /* | |
229 | * Drivers should NOT use these either. | |
230 | */ | |
231 | #define __pa(x) __virt_to_phys((unsigned long)(x)) | |
232 | #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) | |
31a5539e | 233 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
1da177e4 LT |
234 | |
235 | /* | |
236 | * Virtual <-> DMA view memory address translations | |
237 | * Again, these are *only* valid on the kernel direct mapped RAM | |
238 | * memory. Use of these is *deprecated* (and that doesn't mean | |
239 | * use the __ prefixed forms instead.) See dma-mapping.h. | |
240 | */ | |
b5ee9002 NP |
241 | #ifndef __virt_to_bus |
242 | #define __virt_to_bus __virt_to_phys | |
243 | #define __bus_to_virt __phys_to_virt | |
1c4a4f48 RK |
244 | #define __pfn_to_bus(x) __pfn_to_phys(x) |
245 | #define __bus_to_pfn(x) __phys_to_pfn(x) | |
b5ee9002 NP |
246 | #endif |
247 | ||
a5d533ee | 248 | #ifdef CONFIG_VIRT_TO_BUS |
1da177e4 LT |
249 | static inline __deprecated unsigned long virt_to_bus(void *x) |
250 | { | |
251 | return __virt_to_bus((unsigned long)x); | |
252 | } | |
253 | ||
254 | static inline __deprecated void *bus_to_virt(unsigned long x) | |
255 | { | |
256 | return (void *)__bus_to_virt(x); | |
257 | } | |
a5d533ee | 258 | #endif |
1da177e4 LT |
259 | |
260 | /* | |
261 | * Conversion between a struct page and a physical address. | |
262 | * | |
263 | * Note: when converting an unknown physical address to a | |
264 | * struct page, the resulting pointer must be validated | |
265 | * using VALID_PAGE(). It must return an invalid struct page | |
266 | * for any physical address not corresponding to a system | |
267 | * RAM address. | |
268 | * | |
269 | * page_to_pfn(page) convert a struct page * to a PFN number | |
270 | * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * | |
1da177e4 LT |
271 | * |
272 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
273 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
274 | */ | |
7d129637 | 275 | #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET |
05944d74 | 276 | |
7d129637 | 277 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
1da177e4 LT |
278 | #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) |
279 | ||
1da177e4 LT |
280 | #endif |
281 | ||
7eb98a2f KH |
282 | #include <asm-generic/memory_model.h> |
283 | ||
1da177e4 | 284 | #endif |