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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 <linux/sizes.h>
20
21#include <asm/cache.h>
22
23#ifdef CONFIG_NEED_MACH_MEMORY_H
24#include <mach/memory.h>
25#endif
26
27/*
28 * Allow for constants defined here to be used from assembly code
29 * by prepending the UL suffix only with actual C code compilation.
30 */
31#define UL(x) _AC(x, UL)
32
33/* PAGE_OFFSET - the virtual address of the start of the kernel image */
34#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
35
36#ifdef CONFIG_MMU
37
38/*
39 * TASK_SIZE - the maximum size of a user space task.
40 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
41 */
42#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
43#define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
44
45/*
46 * The maximum size of a 26-bit user space task.
47 */
48#define TASK_SIZE_26 (UL(1) << 26)
49
50/*
51 * The module space lives between the addresses given by TASK_SIZE
52 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
53 */
54#ifndef CONFIG_THUMB2_KERNEL
55#define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
56#else
57/* smaller range for Thumb-2 symbols relocation (2^24)*/
58#define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
59#endif
60
61#if TASK_SIZE > MODULES_VADDR
62#error Top of user space clashes with start of module space
63#endif
64
65/*
66 * The highmem pkmap virtual space shares the end of the module area.
67 */
68#ifdef CONFIG_HIGHMEM
69#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
70#else
71#define MODULES_END (PAGE_OFFSET)
72#endif
73
74/*
75 * The XIP kernel gets mapped at the bottom of the module vm area.
76 * Since we use sections to map it, this macro replaces the physical address
77 * with its virtual address while keeping offset from the base section.
78 */
79#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
80
81/*
82 * Allow 16MB-aligned ioremap pages
83 */
84#define IOREMAP_MAX_ORDER 24
85
86#define CONSISTENT_END (0xffe00000UL)
87
88#else /* CONFIG_MMU */
89
90/*
91 * The limitation of user task size can grow up to the end of free ram region.
92 * It is difficult to define and perhaps will never meet the original meaning
93 * of this define that was meant to.
94 * Fortunately, there is no reference for this in noMMU mode, for now.
95 */
96#ifndef TASK_SIZE
97#define TASK_SIZE (CONFIG_DRAM_SIZE)
98#endif
99
100#ifndef TASK_UNMAPPED_BASE
101#define TASK_UNMAPPED_BASE UL(0x00000000)
102#endif
103
104#ifndef END_MEM
105#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
106#endif
107
108/*
109 * The module can be at any place in ram in nommu mode.
110 */
111#define MODULES_END (END_MEM)
112#define MODULES_VADDR PAGE_OFFSET
113
114#define XIP_VIRT_ADDR(physaddr) (physaddr)
115
116#endif /* !CONFIG_MMU */
117
118/*
119 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
120 * locations
121 */
122#ifdef CONFIG_HAVE_TCM
123#define ITCM_OFFSET UL(0xfffe0000)
124#define DTCM_OFFSET UL(0xfffe8000)
125#endif
126
127/*
128 * Convert a physical address to a Page Frame Number and back
129 */
130#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
131#define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
132
133/*
134 * Convert a page to/from a physical address
135 */
136#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
137#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
138
139/*
140 * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed
141 * around in head.S and proc-*.S are shifted by this amount, in order to
142 * leave spare high bits for systems with physical address extension. This
143 * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but
144 * gives us about 38-bits or so.
145 */
146#ifdef CONFIG_ARM_LPAE
147#define ARCH_PGD_SHIFT L1_CACHE_SHIFT
148#else
149#define ARCH_PGD_SHIFT 0
150#endif
151#define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1)
152
153/*
154 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
155 * memory. This is used for XIP and NoMMU kernels, or by kernels which
156 * have their own mach/memory.h. Assembly code must always use
157 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
158 */
159#ifndef PLAT_PHYS_OFFSET
160#define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
161#endif
162
163#ifndef __ASSEMBLY__
164
165/*
166 * Physical vs virtual RAM address space conversion. These are
167 * private definitions which should NOT be used outside memory.h
168 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
169 *
170 * PFNs are used to describe any physical page; this means
171 * PFN 0 == physical address 0.
172 */
173#if defined(__virt_to_phys)
174#define PHYS_OFFSET PLAT_PHYS_OFFSET
175#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
176
177#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
178
179#elif defined(CONFIG_ARM_PATCH_PHYS_VIRT)
180
181/*
182 * Constants used to force the right instruction encodings and shifts
183 * so that all we need to do is modify the 8-bit constant field.
184 */
185#define __PV_BITS_31_24 0x81000000
186#define __PV_BITS_7_0 0x81
187
188extern unsigned long __pv_phys_pfn_offset;
189extern u64 __pv_offset;
190extern void fixup_pv_table(const void *, unsigned long);
191extern const void *__pv_table_begin, *__pv_table_end;
192
193#define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
194#define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
195
196#define virt_to_pfn(kaddr) \
197 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
198 PHYS_PFN_OFFSET)
199
200#define __pv_stub(from,to,instr,type) \
201 __asm__("@ __pv_stub\n" \
202 "1: " instr " %0, %1, %2\n" \
203 " .pushsection .pv_table,\"a\"\n" \
204 " .long 1b\n" \
205 " .popsection\n" \
206 : "=r" (to) \
207 : "r" (from), "I" (type))
208
209#define __pv_stub_mov_hi(t) \
210 __asm__ volatile("@ __pv_stub_mov\n" \
211 "1: mov %R0, %1\n" \
212 " .pushsection .pv_table,\"a\"\n" \
213 " .long 1b\n" \
214 " .popsection\n" \
215 : "=r" (t) \
216 : "I" (__PV_BITS_7_0))
217
218#define __pv_add_carry_stub(x, y) \
219 __asm__ volatile("@ __pv_add_carry_stub\n" \
220 "1: adds %Q0, %1, %2\n" \
221 " adc %R0, %R0, #0\n" \
222 " .pushsection .pv_table,\"a\"\n" \
223 " .long 1b\n" \
224 " .popsection\n" \
225 : "+r" (y) \
226 : "r" (x), "I" (__PV_BITS_31_24) \
227 : "cc")
228
229static inline phys_addr_t __virt_to_phys(unsigned long x)
230{
231 phys_addr_t t;
232
233 if (sizeof(phys_addr_t) == 4) {
234 __pv_stub(x, t, "add", __PV_BITS_31_24);
235 } else {
236 __pv_stub_mov_hi(t);
237 __pv_add_carry_stub(x, t);
238 }
239 return t;
240}
241
242static inline unsigned long __phys_to_virt(phys_addr_t x)
243{
244 unsigned long t;
245
246 /*
247 * 'unsigned long' cast discard upper word when
248 * phys_addr_t is 64 bit, and makes sure that inline
249 * assembler expression receives 32 bit argument
250 * in place where 'r' 32 bit operand is expected.
251 */
252 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
253 return t;
254}
255
256#else
257
258#define PHYS_OFFSET PLAT_PHYS_OFFSET
259#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
260
261static inline phys_addr_t __virt_to_phys(unsigned long x)
262{
263 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
264}
265
266static inline unsigned long __phys_to_virt(phys_addr_t x)
267{
268 return x - PHYS_OFFSET + PAGE_OFFSET;
269}
270
271#define virt_to_pfn(kaddr) \
272 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
273 PHYS_PFN_OFFSET)
274
275#endif
276
277/*
278 * These are *only* valid on the kernel direct mapped RAM memory.
279 * Note: Drivers should NOT use these. They are the wrong
280 * translation for translating DMA addresses. Use the driver
281 * DMA support - see dma-mapping.h.
282 */
283static inline phys_addr_t virt_to_phys(const volatile void *x)
284{
285 return __virt_to_phys((unsigned long)(x));
286}
287
288static inline void *phys_to_virt(phys_addr_t x)
289{
290 return (void *)__phys_to_virt(x);
291}
292
293/*
294 * Drivers should NOT use these either.
295 */
296#define __pa(x) __virt_to_phys((unsigned long)(x))
297#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
298#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
299
300extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x);
301
302/*
303 * These are for systems that have a hardware interconnect supported alias of
304 * physical memory for idmap purposes. Most cases should leave these
305 * untouched.
306 */
307static inline phys_addr_t __virt_to_idmap(unsigned long x)
308{
309 if (arch_virt_to_idmap)
310 return arch_virt_to_idmap(x);
311 else
312 return __virt_to_phys(x);
313}
314
315#define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
316
317/*
318 * Virtual <-> DMA view memory address translations
319 * Again, these are *only* valid on the kernel direct mapped RAM
320 * memory. Use of these is *deprecated* (and that doesn't mean
321 * use the __ prefixed forms instead.) See dma-mapping.h.
322 */
323#ifndef __virt_to_bus
324#define __virt_to_bus __virt_to_phys
325#define __bus_to_virt __phys_to_virt
326#define __pfn_to_bus(x) __pfn_to_phys(x)
327#define __bus_to_pfn(x) __phys_to_pfn(x)
328#endif
329
330#ifdef CONFIG_VIRT_TO_BUS
331static inline __deprecated unsigned long virt_to_bus(void *x)
332{
333 return __virt_to_bus((unsigned long)x);
334}
335
336static inline __deprecated void *bus_to_virt(unsigned long x)
337{
338 return (void *)__bus_to_virt(x);
339}
340#endif
341
342/*
343 * Conversion between a struct page and a physical address.
344 *
345 * page_to_pfn(page) convert a struct page * to a PFN number
346 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
347 *
348 * virt_to_page(k) convert a _valid_ virtual address to struct page *
349 * virt_addr_valid(k) indicates whether a virtual address is valid
350 */
351#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
352
353#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
354#define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
355 && pfn_valid(virt_to_pfn(kaddr)))
356
357#endif
358
359#include <asm-generic/memory_model.h>
360
361#endif
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 <mach/memory.h>
20#include <asm/sizes.h>
21
22/*
23 * Allow for constants defined here to be used from assembly code
24 * by prepending the UL suffix only with actual C code compilation.
25 */
26#define UL(x) _AC(x, UL)
27
28#ifdef CONFIG_MMU
29
30/*
31 * PAGE_OFFSET - the virtual address of the start of the kernel image
32 * TASK_SIZE - the maximum size of a user space task.
33 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
34 */
35#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
36#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
37#define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3)
38
39/*
40 * The maximum size of a 26-bit user space task.
41 */
42#define TASK_SIZE_26 UL(0x04000000)
43
44/*
45 * The module space lives between the addresses given by TASK_SIZE
46 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
47 */
48#ifndef CONFIG_THUMB2_KERNEL
49#define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
50#else
51/* smaller range for Thumb-2 symbols relocation (2^24)*/
52#define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024)
53#endif
54
55#if TASK_SIZE > MODULES_VADDR
56#error Top of user space clashes with start of module space
57#endif
58
59/*
60 * The highmem pkmap virtual space shares the end of the module area.
61 */
62#ifdef CONFIG_HIGHMEM
63#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
64#else
65#define MODULES_END (PAGE_OFFSET)
66#endif
67
68/*
69 * The XIP kernel gets mapped at the bottom of the module vm area.
70 * Since we use sections to map it, this macro replaces the physical address
71 * with its virtual address while keeping offset from the base section.
72 */
73#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
74
75/*
76 * Allow 16MB-aligned ioremap pages
77 */
78#define IOREMAP_MAX_ORDER 24
79
80/*
81 * Size of DMA-consistent memory region. Must be multiple of 2M,
82 * between 2MB and 14MB inclusive.
83 */
84#ifndef CONSISTENT_DMA_SIZE
85#define CONSISTENT_DMA_SIZE SZ_2M
86#endif
87
88#define CONSISTENT_END (0xffe00000UL)
89#define CONSISTENT_BASE (CONSISTENT_END - CONSISTENT_DMA_SIZE)
90
91#else /* CONFIG_MMU */
92
93/*
94 * The limitation of user task size can grow up to the end of free ram region.
95 * It is difficult to define and perhaps will never meet the original meaning
96 * of this define that was meant to.
97 * Fortunately, there is no reference for this in noMMU mode, for now.
98 */
99#ifndef TASK_SIZE
100#define TASK_SIZE (CONFIG_DRAM_SIZE)
101#endif
102
103#ifndef TASK_UNMAPPED_BASE
104#define TASK_UNMAPPED_BASE UL(0x00000000)
105#endif
106
107#ifndef PHYS_OFFSET
108#define PHYS_OFFSET UL(CONFIG_DRAM_BASE)
109#endif
110
111#ifndef END_MEM
112#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
113#endif
114
115#ifndef PAGE_OFFSET
116#define PAGE_OFFSET (PHYS_OFFSET)
117#endif
118
119/*
120 * The module can be at any place in ram in nommu mode.
121 */
122#define MODULES_END (END_MEM)
123#define MODULES_VADDR (PHYS_OFFSET)
124
125#endif /* !CONFIG_MMU */
126
127/*
128 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
129 * locations
130 */
131#ifdef CONFIG_HAVE_TCM
132#define ITCM_OFFSET UL(0xfffe0000)
133#define DTCM_OFFSET UL(0xfffe8000)
134#endif
135
136/*
137 * Convert a physical address to a Page Frame Number and back
138 */
139#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
140#define __pfn_to_phys(pfn) ((phys_addr_t)(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 * Physical vs virtual RAM address space conversion. These are
152 * private definitions which should NOT be used outside memory.h
153 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
154 */
155#ifndef __virt_to_phys
156#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
157
158/*
159 * Constants used to force the right instruction encodings and shifts
160 * so that all we need to do is modify the 8-bit constant field.
161 */
162#define __PV_BITS_31_24 0x81000000
163#define __PV_BITS_23_16 0x00810000
164
165extern unsigned long __pv_phys_offset;
166#define PHYS_OFFSET __pv_phys_offset
167
168#define __pv_stub(from,to,instr,type) \
169 __asm__("@ __pv_stub\n" \
170 "1: " instr " %0, %1, %2\n" \
171 " .pushsection .pv_table,\"a\"\n" \
172 " .long 1b\n" \
173 " .popsection\n" \
174 : "=r" (to) \
175 : "r" (from), "I" (type))
176
177static inline unsigned long __virt_to_phys(unsigned long x)
178{
179 unsigned long t;
180 __pv_stub(x, t, "add", __PV_BITS_31_24);
181#ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT
182 __pv_stub(t, t, "add", __PV_BITS_23_16);
183#endif
184 return t;
185}
186
187static inline unsigned long __phys_to_virt(unsigned long x)
188{
189 unsigned long t;
190 __pv_stub(x, t, "sub", __PV_BITS_31_24);
191#ifdef CONFIG_ARM_PATCH_PHYS_VIRT_16BIT
192 __pv_stub(t, t, "sub", __PV_BITS_23_16);
193#endif
194 return t;
195}
196#else
197#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
198#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
199#endif
200#endif
201
202#ifndef PHYS_OFFSET
203#define PHYS_OFFSET PLAT_PHYS_OFFSET
204#endif
205
206/*
207 * PFNs are used to describe any physical page; this means
208 * PFN 0 == physical address 0.
209 *
210 * This is the PFN of the first RAM page in the kernel
211 * direct-mapped view. We assume this is the first page
212 * of RAM in the mem_map as well.
213 */
214#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
215
216/*
217 * These are *only* valid on the kernel direct mapped RAM memory.
218 * Note: Drivers should NOT use these. They are the wrong
219 * translation for translating DMA addresses. Use the driver
220 * DMA support - see dma-mapping.h.
221 */
222static inline phys_addr_t virt_to_phys(const volatile void *x)
223{
224 return __virt_to_phys((unsigned long)(x));
225}
226
227static inline void *phys_to_virt(phys_addr_t x)
228{
229 return (void *)(__phys_to_virt((unsigned long)(x)));
230}
231
232/*
233 * Drivers should NOT use these either.
234 */
235#define __pa(x) __virt_to_phys((unsigned long)(x))
236#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
237#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
238
239/*
240 * Virtual <-> DMA view memory address translations
241 * Again, these are *only* valid on the kernel direct mapped RAM
242 * memory. Use of these is *deprecated* (and that doesn't mean
243 * use the __ prefixed forms instead.) See dma-mapping.h.
244 */
245#ifndef __virt_to_bus
246#define __virt_to_bus __virt_to_phys
247#define __bus_to_virt __phys_to_virt
248#define __pfn_to_bus(x) __pfn_to_phys(x)
249#define __bus_to_pfn(x) __phys_to_pfn(x)
250#endif
251
252static inline __deprecated unsigned long virt_to_bus(void *x)
253{
254 return __virt_to_bus((unsigned long)x);
255}
256
257static inline __deprecated void *bus_to_virt(unsigned long x)
258{
259 return (void *)__bus_to_virt(x);
260}
261
262/*
263 * Conversion between a struct page and a physical address.
264 *
265 * Note: when converting an unknown physical address to a
266 * struct page, the resulting pointer must be validated
267 * using VALID_PAGE(). It must return an invalid struct page
268 * for any physical address not corresponding to a system
269 * RAM address.
270 *
271 * page_to_pfn(page) convert a struct page * to a PFN number
272 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
273 *
274 * virt_to_page(k) convert a _valid_ virtual address to struct page *
275 * virt_addr_valid(k) indicates whether a virtual address is valid
276 */
277#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
278
279#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
280#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
281
282/*
283 * Optional coherency support. Currently used only by selected
284 * Intel XSC3-based systems.
285 */
286#ifndef arch_is_coherent
287#define arch_is_coherent() 0
288#endif
289
290#endif
291
292#include <asm-generic/memory_model.h>
293
294#endif