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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/*
80 * Size of DMA-consistent memory region. Must be multiple of 2M,
81 * between 2MB and 14MB inclusive.
82 */
83#ifndef CONSISTENT_DMA_SIZE
84#define CONSISTENT_DMA_SIZE SZ_2M
85#endif
86
87#define CONSISTENT_END (0xffe00000UL)
88#define CONSISTENT_BASE (CONSISTENT_END - CONSISTENT_DMA_SIZE)
89
90#else /* CONFIG_MMU */
91
92/*
93 * The limitation of user task size can grow up to the end of free ram region.
94 * It is difficult to define and perhaps will never meet the original meaning
95 * of this define that was meant to.
96 * Fortunately, there is no reference for this in noMMU mode, for now.
97 */
98#ifndef TASK_SIZE
99#define TASK_SIZE (CONFIG_DRAM_SIZE)
100#endif
101
102#ifndef TASK_UNMAPPED_BASE
103#define TASK_UNMAPPED_BASE UL(0x00000000)
104#endif
105
106#ifndef PHYS_OFFSET
107#define PHYS_OFFSET UL(CONFIG_DRAM_BASE)
108#endif
109
110#ifndef END_MEM
111#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
112#endif
113
114#ifndef PAGE_OFFSET
115#define PAGE_OFFSET (PHYS_OFFSET)
116#endif
117
118/*
119 * The module can be at any place in ram in nommu mode.
120 */
121#define MODULES_END (END_MEM)
122#define MODULES_VADDR (PHYS_OFFSET)
123
124#endif /* !CONFIG_MMU */
125
126/*
127 * Physical vs virtual RAM address space conversion. These are
128 * private definitions which should NOT be used outside memory.h
129 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
130 */
131#ifndef __virt_to_phys
132#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
133#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
134#endif
135
136/*
137 * Convert a physical address to a Page Frame Number and back
138 */
139#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
140#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
141
142/*
143 * Convert a page to/from a physical address
144 */
145#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
146#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
147
148#ifndef __ASSEMBLY__
149
150/*
151 * The DMA mask corresponding to the maximum bus address allocatable
152 * using GFP_DMA. The default here places no restriction on DMA
153 * allocations. This must be the smallest DMA mask in the system,
154 * so a successful GFP_DMA allocation will always satisfy this.
155 */
156#ifndef ISA_DMA_THRESHOLD
157#define ISA_DMA_THRESHOLD (0xffffffffULL)
158#endif
159
160#ifndef arch_adjust_zones
161#define arch_adjust_zones(node,size,holes) do { } while (0)
162#elif !defined(CONFIG_ZONE_DMA)
163#error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
164#endif
165
166/*
167 * PFNs are used to describe any physical page; this means
168 * PFN 0 == physical address 0.
169 *
170 * This is the PFN of the first RAM page in the kernel
171 * direct-mapped view. We assume this is the first page
172 * of RAM in the mem_map as well.
173 */
174#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
175
176/*
177 * These are *only* valid on the kernel direct mapped RAM memory.
178 * Note: Drivers should NOT use these. They are the wrong
179 * translation for translating DMA addresses. Use the driver
180 * DMA support - see dma-mapping.h.
181 */
182static inline unsigned long virt_to_phys(void *x)
183{
184 return __virt_to_phys((unsigned long)(x));
185}
186
187static inline void *phys_to_virt(unsigned long x)
188{
189 return (void *)(__phys_to_virt((unsigned long)(x)));
190}
191
192/*
193 * Drivers should NOT use these either.
194 */
195#define __pa(x) __virt_to_phys((unsigned long)(x))
196#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
197#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
198
199/*
200 * Virtual <-> DMA view memory address translations
201 * Again, these are *only* valid on the kernel direct mapped RAM
202 * memory. Use of these is *deprecated* (and that doesn't mean
203 * use the __ prefixed forms instead.) See dma-mapping.h.
204 */
205#ifndef __virt_to_bus
206#define __virt_to_bus __virt_to_phys
207#define __bus_to_virt __phys_to_virt
208#define __pfn_to_bus(x) __pfn_to_phys(x)
209#define __bus_to_pfn(x) __phys_to_pfn(x)
210#endif
211
212static inline __deprecated unsigned long virt_to_bus(void *x)
213{
214 return __virt_to_bus((unsigned long)x);
215}
216
217static inline __deprecated void *bus_to_virt(unsigned long x)
218{
219 return (void *)__bus_to_virt(x);
220}
221
222/*
223 * Conversion between a struct page and a physical address.
224 *
225 * Note: when converting an unknown physical address to a
226 * struct page, the resulting pointer must be validated
227 * using VALID_PAGE(). It must return an invalid struct page
228 * for any physical address not corresponding to a system
229 * RAM address.
230 *
231 * page_to_pfn(page) convert a struct page * to a PFN number
232 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
233 *
234 * virt_to_page(k) convert a _valid_ virtual address to struct page *
235 * virt_addr_valid(k) indicates whether a virtual address is valid
236 */
237#ifndef CONFIG_DISCONTIGMEM
238
239#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
240
241#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
242#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
243
244#define PHYS_TO_NID(addr) (0)
245
246#else /* CONFIG_DISCONTIGMEM */
247
248/*
249 * This is more complex. We have a set of mem_map arrays spread
250 * around in memory.
251 */
252#include <linux/numa.h>
253
254#define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
255#define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
256
257#define virt_to_page(kaddr) \
258 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
259
260#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
261
262/*
263 * Common discontigmem stuff.
264 * PHYS_TO_NID is used by the ARM kernel/setup.c
265 */
266#define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
267
268/*
269 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
270 * and returns the mem_map of that node.
271 */
272#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
273
274/*
275 * Given a page frame number, find the owning node of the memory
276 * and returns the mem_map of that node.
277 */
278#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
279
280#ifdef NODE_MEM_SIZE_BITS
281#define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)
282
283/*
284 * Given a kernel address, find the home node of the underlying memory.
285 */
286#define KVADDR_TO_NID(addr) \
287 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
288
289/*
290 * Given a page frame number, convert it to a node id.
291 */
292#define PFN_TO_NID(pfn) \
293 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
294
295/*
296 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
297 * and returns the index corresponding to the appropriate page in the
298 * node's mem_map.
299 */
300#define LOCAL_MAP_NR(addr) \
301 (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
302
303#endif /* NODE_MEM_SIZE_BITS */
304
305#endif /* !CONFIG_DISCONTIGMEM */
306
307/*
308 * Optional coherency support. Currently used only by selected
309 * Intel XSC3-based systems.
310 */
311#ifndef arch_is_coherent
312#define arch_is_coherent() 0
313#endif
314
315#endif
316
317#include <asm-generic/memory_model.h>
318
319#endif