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 #define XIP_VIRT_ADDR(physaddr) (physaddr)
120
121 #endif /* !CONFIG_MMU */
122
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
132 /*
133 * Convert a physical address to a Page Frame Number and back
134 */
135 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
136 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
137
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
144 #ifndef __ASSEMBLY__
145
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
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
159
160 extern unsigned long __pv_phys_offset;
161 #define PHYS_OFFSET __pv_phys_offset
162
163 #define __pv_stub(from,to,instr,type) \
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) \
170 : "r" (from), "I" (type))
171
__virt_to_phys(unsigned long x)172 static inline unsigned long __virt_to_phys(unsigned long x)
173 {
174 unsigned long t;
175 __pv_stub(x, t, "add", __PV_BITS_31_24);
176 return t;
177 }
178
__phys_to_virt(unsigned long x)179 static inline unsigned long __phys_to_virt(unsigned long x)
180 {
181 unsigned long t;
182 __pv_stub(x, t, "sub", __PV_BITS_31_24);
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
190
191 #ifndef PHYS_OFFSET
192 #ifdef PLAT_PHYS_OFFSET
193 #define PHYS_OFFSET PLAT_PHYS_OFFSET
194 #else
195 #define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
196 #endif
197 #endif
198
199 /*
200 * PFNs are used to describe any physical page; this means
201 * PFN 0 == physical address 0.
202 *
203 * This is the PFN of the first RAM page in the kernel
204 * direct-mapped view. We assume this is the first page
205 * of RAM in the mem_map as well.
206 */
207 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
208
209 /*
210 * These are *only* valid on the kernel direct mapped RAM memory.
211 * Note: Drivers should NOT use these. They are the wrong
212 * translation for translating DMA addresses. Use the driver
213 * DMA support - see dma-mapping.h.
214 */
virt_to_phys(const volatile void * x)215 static inline phys_addr_t virt_to_phys(const volatile void *x)
216 {
217 return __virt_to_phys((unsigned long)(x));
218 }
219
phys_to_virt(phys_addr_t x)220 static inline void *phys_to_virt(phys_addr_t x)
221 {
222 return (void *)(__phys_to_virt((unsigned long)(x)));
223 }
224
225 /*
226 * Drivers should NOT use these either.
227 */
228 #define __pa(x) __virt_to_phys((unsigned long)(x))
229 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
230 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
231
232 /*
233 * Virtual <-> DMA view memory address translations
234 * Again, these are *only* valid on the kernel direct mapped RAM
235 * memory. Use of these is *deprecated* (and that doesn't mean
236 * use the __ prefixed forms instead.) See dma-mapping.h.
237 */
238 #ifndef __virt_to_bus
239 #define __virt_to_bus __virt_to_phys
240 #define __bus_to_virt __phys_to_virt
241 #define __pfn_to_bus(x) __pfn_to_phys(x)
242 #define __bus_to_pfn(x) __phys_to_pfn(x)
243 #endif
244
virt_to_bus(void * x)245 static inline __deprecated unsigned long virt_to_bus(void *x)
246 {
247 return __virt_to_bus((unsigned long)x);
248 }
249
bus_to_virt(unsigned long x)250 static inline __deprecated void *bus_to_virt(unsigned long x)
251 {
252 return (void *)__bus_to_virt(x);
253 }
254
255 /*
256 * Conversion between a struct page and a physical address.
257 *
258 * Note: when converting an unknown physical address to a
259 * struct page, the resulting pointer must be validated
260 * using VALID_PAGE(). It must return an invalid struct page
261 * for any physical address not corresponding to a system
262 * RAM address.
263 *
264 * page_to_pfn(page) convert a struct page * to a PFN number
265 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
266 *
267 * virt_to_page(k) convert a _valid_ virtual address to struct page *
268 * virt_addr_valid(k) indicates whether a virtual address is valid
269 */
270 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
271
272 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
273 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
274
275 /*
276 * Optional coherency support. Currently used only by selected
277 * Intel XSC3-based systems.
278 */
279 #ifndef arch_is_coherent
280 #define arch_is_coherent() 0
281 #endif
282
283 #endif
284
285 #include <asm-generic/memory_model.h>
286
287 #endif
288