ia64/linux-2.6.18-xen.hg

view include/asm-arm/memory.h @ 782:9ab1c319531f

merge with linux-2.6.18-xen.hg
author Isaku Yamahata <yamahata@valinux.co.jp>
date Wed Jan 28 13:07:23 2009 +0900 (2009-01-28)
parents 831230e53067
children
line source
1 /*
2 * linux/include/asm-arm/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
16 /*
17 * Allow for constants defined here to be used from assembly code
18 * by prepending the UL suffix only with actual C code compilation.
19 */
20 #ifndef __ASSEMBLY__
21 #define UL(x) (x##UL)
22 #else
23 #define UL(x) (x)
24 #endif
26 #include <linux/compiler.h>
27 #include <asm/arch/memory.h>
28 #include <asm/sizes.h>
30 #ifdef CONFIG_MMU
32 #ifndef TASK_SIZE
33 /*
34 * TASK_SIZE - the maximum size of a user space task.
35 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
36 */
37 #define TASK_SIZE UL(0xbf000000)
38 #define TASK_UNMAPPED_BASE UL(0x40000000)
39 #endif
41 /*
42 * The maximum size of a 26-bit user space task.
43 */
44 #define TASK_SIZE_26 UL(0x04000000)
46 /*
47 * Page offset: 3GB
48 */
49 #ifndef PAGE_OFFSET
50 #define PAGE_OFFSET UL(0xc0000000)
51 #endif
53 /*
54 * The module space lives between the addresses given by TASK_SIZE
55 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
56 */
57 #define MODULE_END (PAGE_OFFSET)
58 #define MODULE_START (MODULE_END - 16*1048576)
60 #if TASK_SIZE > MODULE_START
61 #error Top of user space clashes with start of module space
62 #endif
64 /*
65 * The XIP kernel gets mapped at the bottom of the module vm area.
66 * Since we use sections to map it, this macro replaces the physical address
67 * with its virtual address while keeping offset from the base section.
68 */
69 #define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff))
71 /*
72 * Allow 16MB-aligned ioremap pages
73 */
74 #define IOREMAP_MAX_ORDER 24
76 #else /* CONFIG_MMU */
78 /*
79 * The limitation of user task size can grow up to the end of free ram region.
80 * It is difficult to define and perhaps will never meet the original meaning
81 * of this define that was meant to.
82 * Fortunately, there is no reference for this in noMMU mode, for now.
83 */
84 #ifndef TASK_SIZE
85 #define TASK_SIZE (CONFIG_DRAM_SIZE)
86 #endif
88 #ifndef TASK_UNMAPPED_BASE
89 #define TASK_UNMAPPED_BASE UL(0x00000000)
90 #endif
92 #ifndef PHYS_OFFSET
93 #define PHYS_OFFSET (CONFIG_DRAM_BASE)
94 #endif
96 #ifndef END_MEM
97 #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
98 #endif
100 #ifndef PAGE_OFFSET
101 #define PAGE_OFFSET (PHYS_OFFSET)
102 #endif
104 /*
105 * The module can be at any place in ram in nommu mode.
106 */
107 #define MODULE_END (END_MEM)
108 #define MODULE_START (PHYS_OFFSET)
110 #endif /* !CONFIG_MMU */
112 /*
113 * Size of DMA-consistent memory region. Must be multiple of 2M,
114 * between 2MB and 14MB inclusive.
115 */
116 #ifndef CONSISTENT_DMA_SIZE
117 #define CONSISTENT_DMA_SIZE SZ_2M
118 #endif
120 /*
121 * Physical vs virtual RAM address space conversion. These are
122 * private definitions which should NOT be used outside memory.h
123 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
124 */
125 #ifndef __virt_to_phys
126 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
127 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
128 #endif
130 /*
131 * Convert a physical address to a Page Frame Number and back
132 */
133 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
134 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
136 #ifndef __ASSEMBLY__
138 /*
139 * The DMA mask corresponding to the maximum bus address allocatable
140 * using GFP_DMA. The default here places no restriction on DMA
141 * allocations. This must be the smallest DMA mask in the system,
142 * so a successful GFP_DMA allocation will always satisfy this.
143 */
144 #ifndef ISA_DMA_THRESHOLD
145 #define ISA_DMA_THRESHOLD (0xffffffffULL)
146 #endif
148 #ifndef arch_adjust_zones
149 #define arch_adjust_zones(node,size,holes) do { } while (0)
150 #endif
152 /*
153 * PFNs are used to describe any physical page; this means
154 * PFN 0 == physical address 0.
155 *
156 * This is the PFN of the first RAM page in the kernel
157 * direct-mapped view. We assume this is the first page
158 * of RAM in the mem_map as well.
159 */
160 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
162 /*
163 * These are *only* valid on the kernel direct mapped RAM memory.
164 * Note: Drivers should NOT use these. They are the wrong
165 * translation for translating DMA addresses. Use the driver
166 * DMA support - see dma-mapping.h.
167 */
168 static inline unsigned long virt_to_phys(void *x)
169 {
170 return __virt_to_phys((unsigned long)(x));
171 }
173 static inline void *phys_to_virt(unsigned long x)
174 {
175 return (void *)(__phys_to_virt((unsigned long)(x)));
176 }
178 /*
179 * Drivers should NOT use these either.
180 */
181 #define __pa(x) __virt_to_phys((unsigned long)(x))
182 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
183 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
185 /*
186 * Virtual <-> DMA view memory address translations
187 * Again, these are *only* valid on the kernel direct mapped RAM
188 * memory. Use of these is *deprecated* (and that doesn't mean
189 * use the __ prefixed forms instead.) See dma-mapping.h.
190 */
191 static inline __deprecated unsigned long virt_to_bus(void *x)
192 {
193 return __virt_to_bus((unsigned long)x);
194 }
196 static inline __deprecated void *bus_to_virt(unsigned long x)
197 {
198 return (void *)__bus_to_virt(x);
199 }
201 /*
202 * Conversion between a struct page and a physical address.
203 *
204 * Note: when converting an unknown physical address to a
205 * struct page, the resulting pointer must be validated
206 * using VALID_PAGE(). It must return an invalid struct page
207 * for any physical address not corresponding to a system
208 * RAM address.
209 *
210 * page_to_pfn(page) convert a struct page * to a PFN number
211 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
212 * pfn_valid(pfn) indicates whether a PFN number is valid
213 *
214 * virt_to_page(k) convert a _valid_ virtual address to struct page *
215 * virt_addr_valid(k) indicates whether a virtual address is valid
216 */
217 #ifndef CONFIG_DISCONTIGMEM
218 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
219 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
221 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
222 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
224 #define PHYS_TO_NID(addr) (0)
226 #else /* CONFIG_DISCONTIGMEM */
228 /*
229 * This is more complex. We have a set of mem_map arrays spread
230 * around in memory.
231 */
232 #include <linux/numa.h>
233 #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
234 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
236 #define pfn_valid(pfn) \
237 ({ \
238 unsigned int nid = PFN_TO_NID(pfn); \
239 int valid = nid < MAX_NUMNODES; \
240 if (valid) { \
241 pg_data_t *node = NODE_DATA(nid); \
242 valid = (pfn - node->node_start_pfn) < \
243 node->node_spanned_pages; \
244 } \
245 valid; \
246 })
248 #define virt_to_page(kaddr) \
249 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
251 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
253 /*
254 * Common discontigmem stuff.
255 * PHYS_TO_NID is used by the ARM kernel/setup.c
256 */
257 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
259 #endif /* !CONFIG_DISCONTIGMEM */
261 /*
262 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
263 */
264 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
266 /*
267 * Optional device DMA address remapping. Do _not_ use directly!
268 * We should really eliminate virt_to_bus() here - it's deprecated.
269 */
270 #ifndef __arch_page_to_dma
271 #define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page)))
272 #define dma_to_virt(dev, addr) ((void *)__bus_to_virt(addr))
273 #define virt_to_dma(dev, addr) ((dma_addr_t)__virt_to_bus((unsigned long)(addr)))
274 #else
275 #define page_to_dma(dev, page) (__arch_page_to_dma(dev, page))
276 #define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr))
277 #define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr))
278 #endif
280 /*
281 * Optional coherency support. Currently used only by selected
282 * Intel XSC3-based systems.
283 */
284 #ifndef arch_is_coherent
285 #define arch_is_coherent() 0
286 #endif
288 #endif
290 #include <asm-generic/memory_model.h>
292 #endif