1 /*
2 * arch/arm/include/asm/memory.h
3 *
4 * Copyright (C) 2000-2002 Russell King
5 * modification for nommu, Hyok S. Choi, 2004
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
16 #include <linux/compiler.h>
17 #include <linux/const.h>
18 #include <linux/types.h>
19 #include <asm/sizes.h>
20
21 #ifdef CONFIG_NEED_MACH_MEMORY_H
22 #include <mach/memory.h>
23 #endif
24
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 */
29 #define UL(x) _AC(x, UL)
30
31 #ifdef CONFIG_MMU
32
33 /*
34 * PAGE_OFFSET - the virtual address of the start of the kernel image
35 * TASK_SIZE - the maximum size of a user space task.
36 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
37 */
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)
41
42 /*
43 * The maximum size of a 26-bit user space task.
44 */
45 #define TASK_SIZE_26 UL(0x04000000)
46
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 */
51 #ifndef CONFIG_THUMB2_KERNEL
52 #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
53 #else
54 /* smaller range for Thumb-2 symbols relocation (2^24)*/
55 #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024)
56 #endif
57
58 #if TASK_SIZE > MODULES_VADDR
59 #error Top of user space clashes with start of module space
60 #endif
61
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
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) (MODULES_VADDR + ((physaddr) & 0x000fffff))
77
78 /*
79 * Allow 16MB-aligned ioremap pages
80 */
81 #define IOREMAP_MAX_ORDER 24
82
83 #define CONSISTENT_END (0xffe00000UL)
84
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
102 #define PHYS_OFFSET UL(CONFIG_DRAM_BASE)
103 #endif
104
105 #ifndef END_MEM
106 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
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 */
116 #define MODULES_END (END_MEM)
117 #define MODULES_VADDR (PHYS_OFFSET)
118
119 #endif /* !CONFIG_MMU */
120
121 /*
122 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
123 * locations
124 */
125 #ifdef CONFIG_HAVE_TCM
126 #define ITCM_OFFSET UL(0xfffe0000)
127 #define DTCM_OFFSET UL(0xfffe8000)
128 #endif
129
130 /*
131 * Convert a physical address to a Page Frame Number and back
132 */
133 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
134 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
135
136 /*
137 * Convert a page to/from a physical address
138 */
139 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
140 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
141
142 #ifndef __ASSEMBLY__
143
144 /*
145 * Physical vs virtual RAM address space conversion. These are
146 * private definitions which should NOT be used outside memory.h
147 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
148 */
149 #ifndef __virt_to_phys
150 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT
151
152 /*
153 * Constants used to force the right instruction encodings and shifts
154 * so that all we need to do is modify the 8-bit constant field.
155 */
156 #define __PV_BITS_31_24 0x81000000
157
158 extern unsigned long __pv_phys_offset;
159 #define PHYS_OFFSET __pv_phys_offset
160
161 #define __pv_stub(from,to,instr,type) \
162 __asm__("@ __pv_stub\n" \
163 "1: " instr " %0, %1, %2\n" \
164 " .pushsection .pv_table,\"a\"\n" \
165 " .long 1b\n" \
166 " .popsection\n" \
167 : "=r" (to) \
168 : "r" (from), "I" (type))
169
__virt_to_phys(unsigned long x)170 static inline unsigned long __virt_to_phys(unsigned long x)
171 {
172 unsigned long t;
173 __pv_stub(x, t, "add", __PV_BITS_31_24);
174 return t;
175 }
176
__phys_to_virt(unsigned long x)177 static inline unsigned long __phys_to_virt(unsigned long x)
178 {
179 unsigned long t;
180 __pv_stub(x, t, "sub", __PV_BITS_31_24);
181 return t;
182 }
183 #else
184 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
185 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
186 #endif
187 #endif
188
189 #ifndef PHYS_OFFSET
190 #ifdef PLAT_PHYS_OFFSET
191 #define PHYS_OFFSET PLAT_PHYS_OFFSET
192 #else
193 #define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
194 #endif
195 #endif
196
197 /*
198 * PFNs are used to describe any physical page; this means
199 * PFN 0 == physical address 0.
200 *
201 * This is the PFN of the first RAM page in the kernel
202 * direct-mapped view. We assume this is the first page
203 * of RAM in the mem_map as well.
204 */
205 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
206
207 /*
208 * These are *only* valid on the kernel direct mapped RAM memory.
209 * Note: Drivers should NOT use these. They are the wrong
210 * translation for translating DMA addresses. Use the driver
211 * DMA support - see dma-mapping.h.
212 */
virt_to_phys(const volatile void * x)213 static inline phys_addr_t virt_to_phys(const volatile void *x)
214 {
215 return __virt_to_phys((unsigned long)(x));
216 }
217
phys_to_virt(phys_addr_t x)218 static inline void *phys_to_virt(phys_addr_t x)
219 {
220 return (void *)(__phys_to_virt((unsigned long)(x)));
221 }
222
223 /*
224 * Drivers should NOT use these either.
225 */
226 #define __pa(x) __virt_to_phys((unsigned long)(x))
227 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
228 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
229
230 /*
231 * Virtual <-> DMA view memory address translations
232 * Again, these are *only* valid on the kernel direct mapped RAM
233 * memory. Use of these is *deprecated* (and that doesn't mean
234 * use the __ prefixed forms instead.) See dma-mapping.h.
235 */
236 #ifndef __virt_to_bus
237 #define __virt_to_bus __virt_to_phys
238 #define __bus_to_virt __phys_to_virt
239 #define __pfn_to_bus(x) __pfn_to_phys(x)
240 #define __bus_to_pfn(x) __phys_to_pfn(x)
241 #endif
242
virt_to_bus(void * x)243 static inline __deprecated unsigned long virt_to_bus(void *x)
244 {
245 return __virt_to_bus((unsigned long)x);
246 }
247
bus_to_virt(unsigned long x)248 static inline __deprecated void *bus_to_virt(unsigned long x)
249 {
250 return (void *)__bus_to_virt(x);
251 }
252
253 /*
254 * Conversion between a struct page and a physical address.
255 *
256 * Note: when converting an unknown physical address to a
257 * struct page, the resulting pointer must be validated
258 * using VALID_PAGE(). It must return an invalid struct page
259 * for any physical address not corresponding to a system
260 * RAM address.
261 *
262 * page_to_pfn(page) convert a struct page * to a PFN number
263 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
264 *
265 * virt_to_page(k) convert a _valid_ virtual address to struct page *
266 * virt_addr_valid(k) indicates whether a virtual address is valid
267 */
268 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
269
270 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
271 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
272
273 /*
274 * Optional coherency support. Currently used only by selected
275 * Intel XSC3-based systems.
276 */
277 #ifndef arch_is_coherent
278 #define arch_is_coherent() 0
279 #endif
280
281 #endif
282
283 #include <asm-generic/memory_model.h>
284
285 #endif
286