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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#ifndef CONFIG_THUMB2_KERNEL
48#define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
49#else
50/* smaller range for Thumb-2 symbols relocation (2^24)*/
51#define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024)
52#endif
53
54#if TASK_SIZE > MODULES_VADDR
55#error Top of user space clashes with start of module space
56#endif
57
58/*
59 * The highmem pkmap virtual space shares the end of the module area.
60 */
61#ifdef CONFIG_HIGHMEM
62#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
63#else
64#define MODULES_END (PAGE_OFFSET)
65#endif
66
67/*
68 * The XIP kernel gets mapped at the bottom of the module vm area.
69 * Since we use sections to map it, this macro replaces the physical address
70 * with its virtual address while keeping offset from the base section.
71 */
72#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
73
74/*
75 * Allow 16MB-aligned ioremap pages
76 */
77#define IOREMAP_MAX_ORDER 24
78
79#else /* CONFIG_MMU */
80
81/*
82 * The limitation of user task size can grow up to the end of free ram region.
83 * It is difficult to define and perhaps will never meet the original meaning
84 * of this define that was meant to.
85 * Fortunately, there is no reference for this in noMMU mode, for now.
86 */
87#ifndef TASK_SIZE
88#define TASK_SIZE (CONFIG_DRAM_SIZE)
89#endif
90
91#ifndef TASK_UNMAPPED_BASE
92#define TASK_UNMAPPED_BASE UL(0x00000000)
93#endif
94
95#ifndef PHYS_OFFSET
96#define PHYS_OFFSET (CONFIG_DRAM_BASE)
97#endif
98
99#ifndef END_MEM
100#define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
101#endif
102
103#ifndef PAGE_OFFSET
104#define PAGE_OFFSET (PHYS_OFFSET)
105#endif
106
107/*
108 * The module can be at any place in ram in nommu mode.
109 */
110#define MODULES_END (END_MEM)
111#define MODULES_VADDR (PHYS_OFFSET)
112
113#endif /* !CONFIG_MMU */
114
115/*
116 * Size of DMA-consistent memory region. Must be multiple of 2M,
117 * between 2MB and 14MB inclusive.
118 */
119#ifndef CONSISTENT_DMA_SIZE
120#define CONSISTENT_DMA_SIZE SZ_2M
121#endif
122
123/*
124 * Physical vs virtual RAM address space conversion. These are
125 * private definitions which should NOT be used outside memory.h
126 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
127 */
128#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
129#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
130
131/*
132 * Convert a physical address to a Page Frame Number and back
133 */
134#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
135#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
136
137#ifndef __ASSEMBLY__
138
139/*
140 * The DMA mask corresponding to the maximum bus address allocatable
141 * using GFP_DMA. The default here places no restriction on DMA
142 * allocations. This must be the smallest DMA mask in the system,
143 * so a successful GFP_DMA allocation will always satisfy this.
144 */
145#ifndef ISA_DMA_THRESHOLD
146#define ISA_DMA_THRESHOLD (0xffffffffULL)
147#endif
148
149#ifndef arch_adjust_zones
150#define arch_adjust_zones(node,size,holes) do { } while (0)
151#elif !defined(CONFIG_ZONE_DMA)
152#error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
153#endif
154
155/*
156 * PFNs are used to describe any physical page; this means
157 * PFN 0 == physical address 0.
158 *
159 * This is the PFN of the first RAM page in the kernel
160 * direct-mapped view. We assume this is the first page
161 * of RAM in the mem_map as well.
162 */
163#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
164
165/*
166 * These are *only* valid on the kernel direct mapped RAM memory.
167 * Note: Drivers should NOT use these. They are the wrong
168 * translation for translating DMA addresses. Use the driver
169 * DMA support - see dma-mapping.h.
170 */
171static inline unsigned long virt_to_phys(void *x)
172{
173 return __virt_to_phys((unsigned long)(x));
174}
175
176static inline void *phys_to_virt(unsigned long x)
177{
178 return (void *)(__phys_to_virt((unsigned long)(x)));
179}
180
181/*
182 * Drivers should NOT use these either.
183 */
184#define __pa(x) __virt_to_phys((unsigned long)(x))
185#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
186#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
187
188/*
189 * Virtual <-> DMA view memory address translations
190 * Again, these are *only* valid on the kernel direct mapped RAM
191 * memory. Use of these is *deprecated* (and that doesn't mean
192 * use the __ prefixed forms instead.) See dma-mapping.h.
193 */
194#ifndef __virt_to_bus
195#define __virt_to_bus __virt_to_phys
196#define __bus_to_virt __phys_to_virt
197#define __pfn_to_bus(x) ((x) << PAGE_SHIFT)
198#endif
199
200static inline __deprecated unsigned long virt_to_bus(void *x)
201{
202 return __virt_to_bus((unsigned long)x);
203}
204
205static inline __deprecated void *bus_to_virt(unsigned long x)
206{
207 return (void *)__bus_to_virt(x);
208}
209
210/*
211 * Conversion between a struct page and a physical address.
212 *
213 * Note: when converting an unknown physical address to a
214 * struct page, the resulting pointer must be validated
215 * using VALID_PAGE(). It must return an invalid struct page
216 * for any physical address not corresponding to a system
217 * RAM address.
218 *
219 * page_to_pfn(page) convert a struct page * to a PFN number
220 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
221 *
222 * virt_to_page(k) convert a _valid_ virtual address to struct page *
223 * virt_addr_valid(k) indicates whether a virtual address is valid
224 */
225#ifndef CONFIG_DISCONTIGMEM
226
227#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
228
229#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
230#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
231
232#define PHYS_TO_NID(addr) (0)
233
234#else /* CONFIG_DISCONTIGMEM */
235
236/*
237 * This is more complex. We have a set of mem_map arrays spread
238 * around in memory.
239 */
240#include <linux/numa.h>
241
242#define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
243#define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
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