Loading...
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
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#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/* PAGE_OFFSET - the virtual address of the start of the kernel image */
32#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
33
34#ifdef CONFIG_MMU
35
36/*
37 * TASK_SIZE - the maximum size of a user space task.
38 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
39 */
40#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
41#define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
42
43/*
44 * The maximum size of a 26-bit user space task.
45 */
46#define TASK_SIZE_26 (UL(1) << 26)
47
48/*
49 * The module space lives between the addresses given by TASK_SIZE
50 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
51 */
52#ifndef CONFIG_THUMB2_KERNEL
53#define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
54#else
55/* smaller range for Thumb-2 symbols relocation (2^24)*/
56#define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
57#endif
58
59#if TASK_SIZE > MODULES_VADDR
60#error Top of user space clashes with start of module space
61#endif
62
63/*
64 * The highmem pkmap virtual space shares the end of the module area.
65 */
66#ifdef CONFIG_HIGHMEM
67#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
68#else
69#define MODULES_END (PAGE_OFFSET)
70#endif
71
72/*
73 * The XIP kernel gets mapped at the bottom of the module vm area.
74 * Since we use sections to map it, this macro replaces the physical address
75 * with its virtual address while keeping offset from the base section.
76 */
77#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
78
79#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
80/*
81 * Allow 16MB-aligned ioremap pages
82 */
83#define IOREMAP_MAX_ORDER 24
84#endif
85
86#else /* CONFIG_MMU */
87
88/*
89 * The limitation of user task size can grow up to the end of free ram region.
90 * It is difficult to define and perhaps will never meet the original meaning
91 * of this define that was meant to.
92 * Fortunately, there is no reference for this in noMMU mode, for now.
93 */
94#define TASK_SIZE UL(0xffffffff)
95
96#ifndef TASK_UNMAPPED_BASE
97#define TASK_UNMAPPED_BASE UL(0x00000000)
98#endif
99
100#ifndef END_MEM
101#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
102#endif
103
104/*
105 * The module can be at any place in ram in nommu mode.
106 */
107#define MODULES_END (END_MEM)
108#define MODULES_VADDR PAGE_OFFSET
109
110#define XIP_VIRT_ADDR(physaddr) (physaddr)
111
112#endif /* !CONFIG_MMU */
113
114/*
115 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
116 * locations
117 */
118#ifdef CONFIG_HAVE_TCM
119#define ITCM_OFFSET UL(0xfffe0000)
120#define DTCM_OFFSET UL(0xfffe8000)
121#endif
122
123/*
124 * Convert a page to/from a physical address
125 */
126#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
127#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
128
129/*
130 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
131 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
132 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
133 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
134 */
135#define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
136
137#ifdef CONFIG_XIP_KERNEL
138/*
139 * When referencing data in RAM from the XIP region in a relative manner
140 * with the MMU off, we need the relative offset between the two physical
141 * addresses. The macro below achieves this, which is:
142 * __pa(v_data) - __xip_pa(v_text)
143 */
144#define PHYS_RELATIVE(v_data, v_text) \
145 (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \
146 ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \
147 CONFIG_XIP_PHYS_ADDR))
148#else
149#define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))
150#endif
151
152#ifndef __ASSEMBLY__
153
154/*
155 * Physical vs virtual RAM address space conversion. These are
156 * private definitions which should NOT be used outside memory.h
157 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
158 *
159 * PFNs are used to describe any physical page; this means
160 * PFN 0 == physical address 0.
161 */
162
163#if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
164
165/*
166 * Constants used to force the right instruction encodings and shifts
167 * so that all we need to do is modify the 8-bit constant field.
168 */
169#define __PV_BITS_31_24 0x81000000
170#define __PV_BITS_7_0 0x81
171
172extern unsigned long __pv_phys_pfn_offset;
173extern u64 __pv_offset;
174extern void fixup_pv_table(const void *, unsigned long);
175extern const void *__pv_table_begin, *__pv_table_end;
176
177#define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
178#define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
179
180#define __pv_stub(from,to,instr,type) \
181 __asm__("@ __pv_stub\n" \
182 "1: " instr " %0, %1, %2\n" \
183 " .pushsection .pv_table,\"a\"\n" \
184 " .long 1b\n" \
185 " .popsection\n" \
186 : "=r" (to) \
187 : "r" (from), "I" (type))
188
189#define __pv_stub_mov_hi(t) \
190 __asm__ volatile("@ __pv_stub_mov\n" \
191 "1: mov %R0, %1\n" \
192 " .pushsection .pv_table,\"a\"\n" \
193 " .long 1b\n" \
194 " .popsection\n" \
195 : "=r" (t) \
196 : "I" (__PV_BITS_7_0))
197
198#define __pv_add_carry_stub(x, y) \
199 __asm__ volatile("@ __pv_add_carry_stub\n" \
200 "1: adds %Q0, %1, %2\n" \
201 " adc %R0, %R0, #0\n" \
202 " .pushsection .pv_table,\"a\"\n" \
203 " .long 1b\n" \
204 " .popsection\n" \
205 : "+r" (y) \
206 : "r" (x), "I" (__PV_BITS_31_24) \
207 : "cc")
208
209static inline phys_addr_t __virt_to_phys(unsigned long x)
210{
211 phys_addr_t t;
212
213 if (sizeof(phys_addr_t) == 4) {
214 __pv_stub(x, t, "add", __PV_BITS_31_24);
215 } else {
216 __pv_stub_mov_hi(t);
217 __pv_add_carry_stub(x, t);
218 }
219 return t;
220}
221
222static inline unsigned long __phys_to_virt(phys_addr_t x)
223{
224 unsigned long t;
225
226 /*
227 * 'unsigned long' cast discard upper word when
228 * phys_addr_t is 64 bit, and makes sure that inline
229 * assembler expression receives 32 bit argument
230 * in place where 'r' 32 bit operand is expected.
231 */
232 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
233 return t;
234}
235
236#else
237
238#define PHYS_OFFSET PLAT_PHYS_OFFSET
239#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
240
241static inline phys_addr_t __virt_to_phys(unsigned long x)
242{
243 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
244}
245
246static inline unsigned long __phys_to_virt(phys_addr_t x)
247{
248 return x - PHYS_OFFSET + PAGE_OFFSET;
249}
250
251#endif
252
253#define virt_to_pfn(kaddr) \
254 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
255 PHYS_PFN_OFFSET)
256
257/*
258 * These are *only* valid on the kernel direct mapped RAM memory.
259 * Note: Drivers should NOT use these. They are the wrong
260 * translation for translating DMA addresses. Use the driver
261 * DMA support - see dma-mapping.h.
262 */
263#define virt_to_phys virt_to_phys
264static inline phys_addr_t virt_to_phys(const volatile void *x)
265{
266 return __virt_to_phys((unsigned long)(x));
267}
268
269#define phys_to_virt phys_to_virt
270static inline void *phys_to_virt(phys_addr_t x)
271{
272 return (void *)__phys_to_virt(x);
273}
274
275/*
276 * Drivers should NOT use these either.
277 */
278#define __pa(x) __virt_to_phys((unsigned long)(x))
279#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
280#define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
281
282extern long long arch_phys_to_idmap_offset;
283
284/*
285 * These are for systems that have a hardware interconnect supported alias
286 * of physical memory for idmap purposes. Most cases should leave these
287 * untouched. Note: this can only return addresses less than 4GiB.
288 */
289static inline bool arm_has_idmap_alias(void)
290{
291 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
292}
293
294#define IDMAP_INVALID_ADDR ((u32)~0)
295
296static inline unsigned long phys_to_idmap(phys_addr_t addr)
297{
298 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
299 addr += arch_phys_to_idmap_offset;
300 if (addr > (u32)~0)
301 addr = IDMAP_INVALID_ADDR;
302 }
303 return addr;
304}
305
306static inline phys_addr_t idmap_to_phys(unsigned long idmap)
307{
308 phys_addr_t addr = idmap;
309
310 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
311 addr -= arch_phys_to_idmap_offset;
312
313 return addr;
314}
315
316static inline unsigned long __virt_to_idmap(unsigned long x)
317{
318 return phys_to_idmap(__virt_to_phys(x));
319}
320
321#define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
322
323/*
324 * Virtual <-> DMA view memory address translations
325 * Again, these are *only* valid on the kernel direct mapped RAM
326 * memory. Use of these is *deprecated* (and that doesn't mean
327 * use the __ prefixed forms instead.) See dma-mapping.h.
328 */
329#ifndef __virt_to_bus
330#define __virt_to_bus __virt_to_phys
331#define __bus_to_virt __phys_to_virt
332#define __pfn_to_bus(x) __pfn_to_phys(x)
333#define __bus_to_pfn(x) __phys_to_pfn(x)
334#endif
335
336/*
337 * Conversion between a struct page and a physical address.
338 *
339 * page_to_pfn(page) convert a struct page * to a PFN number
340 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
341 *
342 * virt_to_page(k) convert a _valid_ virtual address to struct page *
343 * virt_addr_valid(k) indicates whether a virtual address is valid
344 */
345#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
346
347#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
348#define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
349 && pfn_valid(virt_to_pfn(kaddr)))
350
351#endif
352
353#include <asm-generic/memory_model.h>
354
355#endif