Linux kernel mirror (for testing)
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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 <mach/memory.h>
19#include <asm/sizes.h>
20
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 */
25#define UL(x) _AC(x, UL)
26
27#ifdef CONFIG_MMU
28
29/*
30 * PAGE_OFFSET - the virtual address of the start of the kernel image
31 * TASK_SIZE - the maximum size of a user space task.
32 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
33 */
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)
37
38/*
39 * The maximum size of a 26-bit user space task.
40 */
41#define TASK_SIZE_26 UL(0x04000000)
42
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 */
47#define MODULES_END (PAGE_OFFSET)
48#define MODULES_VADDR (MODULES_END - 16*1048576)
49
50#if TASK_SIZE > MODULES_VADDR
51#error Top of user space clashes with start of module space
52#endif
53
54/*
55 * The XIP kernel gets mapped at the bottom of the module vm area.
56 * Since we use sections to map it, this macro replaces the physical address
57 * with its virtual address while keeping offset from the base section.
58 */
59#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
60
61/*
62 * Allow 16MB-aligned ioremap pages
63 */
64#define IOREMAP_MAX_ORDER 24
65
66#else /* CONFIG_MMU */
67
68/*
69 * The limitation of user task size can grow up to the end of free ram region.
70 * It is difficult to define and perhaps will never meet the original meaning
71 * of this define that was meant to.
72 * Fortunately, there is no reference for this in noMMU mode, for now.
73 */
74#ifndef TASK_SIZE
75#define TASK_SIZE (CONFIG_DRAM_SIZE)
76#endif
77
78#ifndef TASK_UNMAPPED_BASE
79#define TASK_UNMAPPED_BASE UL(0x00000000)
80#endif
81
82#ifndef PHYS_OFFSET
83#define PHYS_OFFSET (CONFIG_DRAM_BASE)
84#endif
85
86#ifndef END_MEM
87#define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
88#endif
89
90#ifndef PAGE_OFFSET
91#define PAGE_OFFSET (PHYS_OFFSET)
92#endif
93
94/*
95 * The module can be at any place in ram in nommu mode.
96 */
97#define MODULES_END (END_MEM)
98#define MODULES_VADDR (PHYS_OFFSET)
99
100#endif /* !CONFIG_MMU */
101
102/*
103 * Size of DMA-consistent memory region. Must be multiple of 2M,
104 * between 2MB and 14MB inclusive.
105 */
106#ifndef CONSISTENT_DMA_SIZE
107#define CONSISTENT_DMA_SIZE SZ_2M
108#endif
109
110/*
111 * Physical vs virtual RAM address space conversion. These are
112 * private definitions which should NOT be used outside memory.h
113 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
114 */
115#ifndef __virt_to_phys
116#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
117#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
118#endif
119
120/*
121 * Convert a physical address to a Page Frame Number and back
122 */
123#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
124#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
125
126#ifndef __ASSEMBLY__
127
128/*
129 * The DMA mask corresponding to the maximum bus address allocatable
130 * using GFP_DMA. The default here places no restriction on DMA
131 * allocations. This must be the smallest DMA mask in the system,
132 * so a successful GFP_DMA allocation will always satisfy this.
133 */
134#ifndef ISA_DMA_THRESHOLD
135#define ISA_DMA_THRESHOLD (0xffffffffULL)
136#endif
137
138#ifndef arch_adjust_zones
139#define arch_adjust_zones(node,size,holes) do { } while (0)
140#elif !defined(CONFIG_ZONE_DMA)
141#error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
142#endif
143
144/*
145 * PFNs are used to describe any physical page; this means
146 * PFN 0 == physical address 0.
147 *
148 * This is the PFN of the first RAM page in the kernel
149 * direct-mapped view. We assume this is the first page
150 * of RAM in the mem_map as well.
151 */
152#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
153
154/*
155 * These are *only* valid on the kernel direct mapped RAM memory.
156 * Note: Drivers should NOT use these. They are the wrong
157 * translation for translating DMA addresses. Use the driver
158 * DMA support - see dma-mapping.h.
159 */
160static inline unsigned long virt_to_phys(void *x)
161{
162 return __virt_to_phys((unsigned long)(x));
163}
164
165static inline void *phys_to_virt(unsigned long x)
166{
167 return (void *)(__phys_to_virt((unsigned long)(x)));
168}
169
170/*
171 * Drivers should NOT use these either.
172 */
173#define __pa(x) __virt_to_phys((unsigned long)(x))
174#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
175#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
176
177/*
178 * Virtual <-> DMA view memory address translations
179 * Again, these are *only* valid on the kernel direct mapped RAM
180 * memory. Use of these is *deprecated* (and that doesn't mean
181 * use the __ prefixed forms instead.) See dma-mapping.h.
182 */
183static inline __deprecated unsigned long virt_to_bus(void *x)
184{
185 return __virt_to_bus((unsigned long)x);
186}
187
188static inline __deprecated void *bus_to_virt(unsigned long x)
189{
190 return (void *)__bus_to_virt(x);
191}
192
193/*
194 * Conversion between a struct page and a physical address.
195 *
196 * Note: when converting an unknown physical address to a
197 * struct page, the resulting pointer must be validated
198 * using VALID_PAGE(). It must return an invalid struct page
199 * for any physical address not corresponding to a system
200 * RAM address.
201 *
202 * page_to_pfn(page) convert a struct page * to a PFN number
203 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
204 * pfn_valid(pfn) indicates whether a PFN number is valid
205 *
206 * virt_to_page(k) convert a _valid_ virtual address to struct page *
207 * virt_addr_valid(k) indicates whether a virtual address is valid
208 */
209#ifndef CONFIG_DISCONTIGMEM
210
211#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
212
213#ifndef CONFIG_SPARSEMEM
214#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
215#endif
216
217#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
218#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
219
220#define PHYS_TO_NID(addr) (0)
221
222#else /* CONFIG_DISCONTIGMEM */
223
224/*
225 * This is more complex. We have a set of mem_map arrays spread
226 * around in memory.
227 */
228#include <linux/numa.h>
229
230#define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
231#define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
232
233#define pfn_valid(pfn) \
234 ({ \
235 unsigned int nid = PFN_TO_NID(pfn); \
236 int valid = nid < MAX_NUMNODES; \
237 if (valid) { \
238 pg_data_t *node = NODE_DATA(nid); \
239 valid = (pfn - node->node_start_pfn) < \
240 node->node_spanned_pages; \
241 } \
242 valid; \
243 })
244
245#define virt_to_page(kaddr) \
246 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
247
248#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
249
250/*
251 * Common discontigmem stuff.
252 * PHYS_TO_NID is used by the ARM kernel/setup.c
253 */
254#define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
255
256/*
257 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
258 * and returns the mem_map of that node.
259 */
260#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
261
262/*
263 * Given a page frame number, find the owning node of the memory
264 * and returns the mem_map of that node.
265 */
266#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
267
268#ifdef NODE_MEM_SIZE_BITS
269#define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)
270
271/*
272 * Given a kernel address, find the home node of the underlying memory.
273 */
274#define KVADDR_TO_NID(addr) \
275 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
276
277/*
278 * Given a page frame number, convert it to a node id.
279 */
280#define PFN_TO_NID(pfn) \
281 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
282
283/*
284 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
285 * and returns the index corresponding to the appropriate page in the
286 * node's mem_map.
287 */
288#define LOCAL_MAP_NR(addr) \
289 (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
290
291#endif /* NODE_MEM_SIZE_BITS */
292
293#endif /* !CONFIG_DISCONTIGMEM */
294
295/*
296 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
297 */
298#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
299
300/*
301 * Optional coherency support. Currently used only by selected
302 * Intel XSC3-based systems.
303 */
304#ifndef arch_is_coherent
305#define arch_is_coherent() 0
306#endif
307
308#endif
309
310#include <asm-generic/memory_model.h>
311
312#endif