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 <linux/types.h>
19#include <asm/sizes.h>
20
21#ifdef CONFIG_NEED_MACH_MEMORY_H
22#include <mach/memory.h>
23#endif
24
25/*
26 * Allow for constants defined here to be used from assembly code
27 * by prepending the UL suffix only with actual C code compilation.
28 */
29#define UL(x) _AC(x, UL)
30
31#ifdef CONFIG_MMU
32
33/*
34 * PAGE_OFFSET - the virtual address of the start of the kernel image
35 * TASK_SIZE - the maximum size of a user space task.
36 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
37 */
38#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
39#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
40#define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3)
41
42/*
43 * The maximum size of a 26-bit user space task.
44 */
45#define TASK_SIZE_26 UL(0x04000000)
46
47/*
48 * The module space lives between the addresses given by TASK_SIZE
49 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
50 */
51#ifndef CONFIG_THUMB2_KERNEL
52#define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
53#else
54/* smaller range for Thumb-2 symbols relocation (2^24)*/
55#define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024)
56#endif
57
58#if TASK_SIZE > MODULES_VADDR
59#error Top of user space clashes with start of module space
60#endif
61
62/*
63 * The highmem pkmap virtual space shares the end of the module area.
64 */
65#ifdef CONFIG_HIGHMEM
66#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
67#else
68#define MODULES_END (PAGE_OFFSET)
69#endif
70
71/*
72 * The XIP kernel gets mapped at the bottom of the module vm area.
73 * Since we use sections to map it, this macro replaces the physical address
74 * with its virtual address while keeping offset from the base section.
75 */
76#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
77
78/*
79 * Allow 16MB-aligned ioremap pages
80 */
81#define IOREMAP_MAX_ORDER 24
82
83#define CONSISTENT_END (0xffe00000UL)
84
85#else /* CONFIG_MMU */
86
87/*
88 * The limitation of user task size can grow up to the end of free ram region.
89 * It is difficult to define and perhaps will never meet the original meaning
90 * of this define that was meant to.
91 * Fortunately, there is no reference for this in noMMU mode, for now.
92 */
93#ifndef TASK_SIZE
94#define TASK_SIZE (CONFIG_DRAM_SIZE)
95#endif
96
97#ifndef TASK_UNMAPPED_BASE
98#define TASK_UNMAPPED_BASE UL(0x00000000)
99#endif
100
101#ifndef PHYS_OFFSET
102#define PHYS_OFFSET UL(CONFIG_DRAM_BASE)
103#endif
104
105#ifndef END_MEM
106#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
107#endif
108
109#ifndef PAGE_OFFSET
110#define PAGE_OFFSET (PHYS_OFFSET)
111#endif
112
113/*
114 * The module can be at any place in ram in nommu mode.
115 */
116#define MODULES_END (END_MEM)
117#define MODULES_VADDR (PHYS_OFFSET)
118
119#endif /* !CONFIG_MMU */
120
121/*
122 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
123 * locations
124 */
125#ifdef CONFIG_HAVE_TCM
126#define ITCM_OFFSET UL(0xfffe0000)
127#define DTCM_OFFSET UL(0xfffe8000)
128#endif
129
130/*
131 * Convert a physical address to a Page Frame Number and back
132 */
133#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
134#define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
135
136/*
137 * Convert a page to/from a physical address
138 */
139#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
140#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
141
142#ifndef __ASSEMBLY__
143
144/*
145 * Physical vs virtual RAM address space conversion. These are
146 * private definitions which should NOT be used outside memory.h
147 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
148 */
149#ifndef __virt_to_phys
150#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
151
152/*
153 * Constants used to force the right instruction encodings and shifts
154 * so that all we need to do is modify the 8-bit constant field.
155 */
156#define __PV_BITS_31_24 0x81000000
157
158extern unsigned long __pv_phys_offset;
159#define PHYS_OFFSET __pv_phys_offset
160
161#define __pv_stub(from,to,instr,type) \
162 __asm__("@ __pv_stub\n" \
163 "1: " instr " %0, %1, %2\n" \
164 " .pushsection .pv_table,\"a\"\n" \
165 " .long 1b\n" \
166 " .popsection\n" \
167 : "=r" (to) \
168 : "r" (from), "I" (type))
169
170static inline unsigned long __virt_to_phys(unsigned long x)
171{
172 unsigned long t;
173 __pv_stub(x, t, "add", __PV_BITS_31_24);
174 return t;
175}
176
177static inline unsigned long __phys_to_virt(unsigned long x)
178{
179 unsigned long t;
180 __pv_stub(x, t, "sub", __PV_BITS_31_24);
181 return t;
182}
183#else
184#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
185#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
186#endif
187#endif
188
189#ifndef PHYS_OFFSET
190#ifdef PLAT_PHYS_OFFSET
191#define PHYS_OFFSET PLAT_PHYS_OFFSET
192#else
193#define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
194#endif
195#endif
196
197/*
198 * PFNs are used to describe any physical page; this means
199 * PFN 0 == physical address 0.
200 *
201 * This is the PFN of the first RAM page in the kernel
202 * direct-mapped view. We assume this is the first page
203 * of RAM in the mem_map as well.
204 */
205#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
206
207/*
208 * These are *only* valid on the kernel direct mapped RAM memory.
209 * Note: Drivers should NOT use these. They are the wrong
210 * translation for translating DMA addresses. Use the driver
211 * DMA support - see dma-mapping.h.
212 */
213static inline phys_addr_t virt_to_phys(const volatile void *x)
214{
215 return __virt_to_phys((unsigned long)(x));
216}
217
218static inline void *phys_to_virt(phys_addr_t x)
219{
220 return (void *)(__phys_to_virt((unsigned long)(x)));
221}
222
223/*
224 * Drivers should NOT use these either.
225 */
226#define __pa(x) __virt_to_phys((unsigned long)(x))
227#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
228#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
229
230/*
231 * Virtual <-> DMA view memory address translations
232 * Again, these are *only* valid on the kernel direct mapped RAM
233 * memory. Use of these is *deprecated* (and that doesn't mean
234 * use the __ prefixed forms instead.) See dma-mapping.h.
235 */
236#ifndef __virt_to_bus
237#define __virt_to_bus __virt_to_phys
238#define __bus_to_virt __phys_to_virt
239#define __pfn_to_bus(x) __pfn_to_phys(x)
240#define __bus_to_pfn(x) __phys_to_pfn(x)
241#endif
242
243static inline __deprecated unsigned long virt_to_bus(void *x)
244{
245 return __virt_to_bus((unsigned long)x);
246}
247
248static inline __deprecated void *bus_to_virt(unsigned long x)
249{
250 return (void *)__bus_to_virt(x);
251}
252
253/*
254 * Conversion between a struct page and a physical address.
255 *
256 * Note: when converting an unknown physical address to a
257 * struct page, the resulting pointer must be validated
258 * using VALID_PAGE(). It must return an invalid struct page
259 * for any physical address not corresponding to a system
260 * RAM address.
261 *
262 * page_to_pfn(page) convert a struct page * to a PFN number
263 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
264 *
265 * virt_to_page(k) convert a _valid_ virtual address to struct page *
266 * virt_addr_valid(k) indicates whether a virtual address is valid
267 */
268#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
269
270#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
271#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
272
273/*
274 * Optional coherency support. Currently used only by selected
275 * Intel XSC3-based systems.
276 */
277#ifndef arch_is_coherent
278#define arch_is_coherent() 0
279#endif
280
281#endif
282
283#include <asm-generic/memory_model.h>
284
285#endif