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#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
116#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
117
118/*
119 * Convert a physical address to a Page Frame Number and back
120 */
121#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
122#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
123
124#ifndef __ASSEMBLY__
125
126/*
127 * The DMA mask corresponding to the maximum bus address allocatable
128 * using GFP_DMA. The default here places no restriction on DMA
129 * allocations. This must be the smallest DMA mask in the system,
130 * so a successful GFP_DMA allocation will always satisfy this.
131 */
132#ifndef ISA_DMA_THRESHOLD
133#define ISA_DMA_THRESHOLD (0xffffffffULL)
134#endif
135
136#ifndef arch_adjust_zones
137#define arch_adjust_zones(node,size,holes) do { } while (0)
138#elif !defined(CONFIG_ZONE_DMA)
139#error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
140#endif
141
142/*
143 * PFNs are used to describe any physical page; this means
144 * PFN 0 == physical address 0.
145 *
146 * This is the PFN of the first RAM page in the kernel
147 * direct-mapped view. We assume this is the first page
148 * of RAM in the mem_map as well.
149 */
150#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
151
152/*
153 * These are *only* valid on the kernel direct mapped RAM memory.
154 * Note: Drivers should NOT use these. They are the wrong
155 * translation for translating DMA addresses. Use the driver
156 * DMA support - see dma-mapping.h.
157 */
158static inline unsigned long virt_to_phys(void *x)
159{
160 return __virt_to_phys((unsigned long)(x));
161}
162
163static inline void *phys_to_virt(unsigned long x)
164{
165 return (void *)(__phys_to_virt((unsigned long)(x)));
166}
167
168/*
169 * Drivers should NOT use these either.
170 */
171#define __pa(x) __virt_to_phys((unsigned long)(x))
172#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
173#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
174
175/*
176 * Virtual <-> DMA view memory address translations
177 * Again, these are *only* valid on the kernel direct mapped RAM
178 * memory. Use of these is *deprecated* (and that doesn't mean
179 * use the __ prefixed forms instead.) See dma-mapping.h.
180 */
181#ifndef __virt_to_bus
182#define __virt_to_bus __virt_to_phys
183#define __bus_to_virt __phys_to_virt
184#endif
185
186static inline __deprecated unsigned long virt_to_bus(void *x)
187{
188 return __virt_to_bus((unsigned long)x);
189}
190
191static inline __deprecated void *bus_to_virt(unsigned long x)
192{
193 return (void *)__bus_to_virt(x);
194}
195
196/*
197 * Conversion between a struct page and a physical address.
198 *
199 * Note: when converting an unknown physical address to a
200 * struct page, the resulting pointer must be validated
201 * using VALID_PAGE(). It must return an invalid struct page
202 * for any physical address not corresponding to a system
203 * RAM address.
204 *
205 * page_to_pfn(page) convert a struct page * to a PFN number
206 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
207 * pfn_valid(pfn) indicates whether a PFN number is valid
208 *
209 * virt_to_page(k) convert a _valid_ virtual address to struct page *
210 * virt_addr_valid(k) indicates whether a virtual address is valid
211 */
212#ifndef CONFIG_DISCONTIGMEM
213
214#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
215
216#ifndef CONFIG_SPARSEMEM
217#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
218#endif
219
220#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
221#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
222
223#define PHYS_TO_NID(addr) (0)
224
225#else /* CONFIG_DISCONTIGMEM */
226
227/*
228 * This is more complex. We have a set of mem_map arrays spread
229 * around in memory.
230 */
231#include <linux/numa.h>
232
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)
235
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 })
247
248#define virt_to_page(kaddr) \
249 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
250
251#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
252
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)
258
259/*
260 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
261 * and returns the mem_map of that node.
262 */
263#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
264
265/*
266 * Given a page frame number, find the owning node of the memory
267 * and returns the mem_map of that node.
268 */
269#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
270
271#ifdef NODE_MEM_SIZE_BITS
272#define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)
273
274/*
275 * Given a kernel address, find the home node of the underlying memory.
276 */
277#define KVADDR_TO_NID(addr) \
278 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
279
280/*
281 * Given a page frame number, convert it to a node id.
282 */
283#define PFN_TO_NID(pfn) \
284 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
285
286/*
287 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
288 * and returns the index corresponding to the appropriate page in the
289 * node's mem_map.
290 */
291#define LOCAL_MAP_NR(addr) \
292 (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
293
294#endif /* NODE_MEM_SIZE_BITS */
295
296#endif /* !CONFIG_DISCONTIGMEM */
297
298/*
299 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
300 */
301#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
302
303/*
304 * Optional coherency support. Currently used only by selected
305 * Intel XSC3-based systems.
306 */
307#ifndef arch_is_coherent
308#define arch_is_coherent() 0
309#endif
310
311#endif
312
313#include <asm-generic/memory_model.h>
314
315#endif