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_VADDR (PAGE_OFFSET - 16*1024*1024)
48#if TASK_SIZE > MODULES_VADDR
49#error Top of user space clashes with start of module space
50#endif
51
52/*
53 * The highmem pkmap virtual space shares the end of the module area.
54 */
55#ifdef CONFIG_HIGHMEM
56#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
57#else
58#define MODULES_END (PAGE_OFFSET)
59#endif
60
61/*
62 * The XIP kernel gets mapped at the bottom of the module vm area.
63 * Since we use sections to map it, this macro replaces the physical address
64 * with its virtual address while keeping offset from the base section.
65 */
66#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
67
68/*
69 * Allow 16MB-aligned ioremap pages
70 */
71#define IOREMAP_MAX_ORDER 24
72
73#else /* CONFIG_MMU */
74
75/*
76 * The limitation of user task size can grow up to the end of free ram region.
77 * It is difficult to define and perhaps will never meet the original meaning
78 * of this define that was meant to.
79 * Fortunately, there is no reference for this in noMMU mode, for now.
80 */
81#ifndef TASK_SIZE
82#define TASK_SIZE (CONFIG_DRAM_SIZE)
83#endif
84
85#ifndef TASK_UNMAPPED_BASE
86#define TASK_UNMAPPED_BASE UL(0x00000000)
87#endif
88
89#ifndef PHYS_OFFSET
90#define PHYS_OFFSET (CONFIG_DRAM_BASE)
91#endif
92
93#ifndef END_MEM
94#define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
95#endif
96
97#ifndef PAGE_OFFSET
98#define PAGE_OFFSET (PHYS_OFFSET)
99#endif
100
101/*
102 * The module can be at any place in ram in nommu mode.
103 */
104#define MODULES_END (END_MEM)
105#define MODULES_VADDR (PHYS_OFFSET)
106
107#endif /* !CONFIG_MMU */
108
109/*
110 * Size of DMA-consistent memory region. Must be multiple of 2M,
111 * between 2MB and 14MB inclusive.
112 */
113#ifndef CONSISTENT_DMA_SIZE
114#define CONSISTENT_DMA_SIZE SZ_2M
115#endif
116
117/*
118 * Physical vs virtual RAM address space conversion. These are
119 * private definitions which should NOT be used outside memory.h
120 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
121 */
122#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
123#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
124
125/*
126 * Convert a physical address to a Page Frame Number and back
127 */
128#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
129#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
130
131#ifndef __ASSEMBLY__
132
133/*
134 * The DMA mask corresponding to the maximum bus address allocatable
135 * using GFP_DMA. The default here places no restriction on DMA
136 * allocations. This must be the smallest DMA mask in the system,
137 * so a successful GFP_DMA allocation will always satisfy this.
138 */
139#ifndef ISA_DMA_THRESHOLD
140#define ISA_DMA_THRESHOLD (0xffffffffULL)
141#endif
142
143#ifndef arch_adjust_zones
144#define arch_adjust_zones(node,size,holes) do { } while (0)
145#elif !defined(CONFIG_ZONE_DMA)
146#error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
147#endif
148
149/*
150 * PFNs are used to describe any physical page; this means
151 * PFN 0 == physical address 0.
152 *
153 * This is the PFN of the first RAM page in the kernel
154 * direct-mapped view. We assume this is the first page
155 * of RAM in the mem_map as well.
156 */
157#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
158
159/*
160 * These are *only* valid on the kernel direct mapped RAM memory.
161 * Note: Drivers should NOT use these. They are the wrong
162 * translation for translating DMA addresses. Use the driver
163 * DMA support - see dma-mapping.h.
164 */
165static inline unsigned long virt_to_phys(void *x)
166{
167 return __virt_to_phys((unsigned long)(x));
168}
169
170static inline void *phys_to_virt(unsigned long x)
171{
172 return (void *)(__phys_to_virt((unsigned long)(x)));
173}
174
175/*
176 * Drivers should NOT use these either.
177 */
178#define __pa(x) __virt_to_phys((unsigned long)(x))
179#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
180#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
181
182/*
183 * Virtual <-> DMA view memory address translations
184 * Again, these are *only* valid on the kernel direct mapped RAM
185 * memory. Use of these is *deprecated* (and that doesn't mean
186 * use the __ prefixed forms instead.) See dma-mapping.h.
187 */
188#ifndef __virt_to_bus
189#define __virt_to_bus __virt_to_phys
190#define __bus_to_virt __phys_to_virt
191#define __pfn_to_bus(x) ((x) << PAGE_SHIFT)
192#endif
193
194static inline __deprecated unsigned long virt_to_bus(void *x)
195{
196 return __virt_to_bus((unsigned long)x);
197}
198
199static inline __deprecated void *bus_to_virt(unsigned long x)
200{
201 return (void *)__bus_to_virt(x);
202}
203
204/*
205 * Conversion between a struct page and a physical address.
206 *
207 * Note: when converting an unknown physical address to a
208 * struct page, the resulting pointer must be validated
209 * using VALID_PAGE(). It must return an invalid struct page
210 * for any physical address not corresponding to a system
211 * RAM address.
212 *
213 * page_to_pfn(page) convert a struct page * to a PFN number
214 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
215 * pfn_valid(pfn) indicates whether a PFN number is valid
216 *
217 * virt_to_page(k) convert a _valid_ virtual address to struct page *
218 * virt_addr_valid(k) indicates whether a virtual address is valid
219 */
220#ifndef CONFIG_DISCONTIGMEM
221
222#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
223
224#ifndef CONFIG_SPARSEMEM
225#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
226#endif
227
228#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
229#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
230
231#define PHYS_TO_NID(addr) (0)
232
233#else /* CONFIG_DISCONTIGMEM */
234
235/*
236 * This is more complex. We have a set of mem_map arrays spread
237 * around in memory.
238 */
239#include <linux/numa.h>
240
241#define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
242#define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
243
244#define pfn_valid(pfn) \
245 ({ \
246 unsigned int nid = PFN_TO_NID(pfn); \
247 int valid = nid < MAX_NUMNODES; \
248 if (valid) { \
249 pg_data_t *node = NODE_DATA(nid); \
250 valid = (pfn - node->node_start_pfn) < \
251 node->node_spanned_pages; \
252 } \
253 valid; \
254 })
255
256#define virt_to_page(kaddr) \
257 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
258
259#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
260
261/*
262 * Common discontigmem stuff.
263 * PHYS_TO_NID is used by the ARM kernel/setup.c
264 */
265#define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
266
267/*
268 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
269 * and returns the mem_map of that node.
270 */
271#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
272
273/*
274 * Given a page frame number, find the owning node of the memory
275 * and returns the mem_map of that node.
276 */
277#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
278
279#ifdef NODE_MEM_SIZE_BITS
280#define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)
281
282/*
283 * Given a kernel address, find the home node of the underlying memory.
284 */
285#define KVADDR_TO_NID(addr) \
286 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
287
288/*
289 * Given a page frame number, convert it to a node id.
290 */
291#define PFN_TO_NID(pfn) \
292 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
293
294/*
295 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
296 * and returns the index corresponding to the appropriate page in the
297 * node's mem_map.
298 */
299#define LOCAL_MAP_NR(addr) \
300 (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
301
302#endif /* NODE_MEM_SIZE_BITS */
303
304#endif /* !CONFIG_DISCONTIGMEM */
305
306/*
307 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
308 */
309#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
310
311/*
312 * Optional coherency support. Currently used only by selected
313 * Intel XSC3-based systems.
314 */
315#ifndef arch_is_coherent
316#define arch_is_coherent() 0
317#endif
318
319#endif
320
321#include <asm-generic/memory_model.h>
322
323#endif