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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * arch/arm/include/asm/memory.h
4 *
5 * Copyright (C) 2000-2002 Russell King
6 * modification for nommu, Hyok S. Choi, 2004
7 *
8 * Note: this file should not be included by non-asm/.h files
9 */
10#ifndef __ASM_ARM_MEMORY_H
11#define __ASM_ARM_MEMORY_H
12
13#include <linux/compiler.h>
14#include <linux/const.h>
15#include <linux/types.h>
16#include <linux/sizes.h>
17
18#ifdef CONFIG_NEED_MACH_MEMORY_H
19#include <mach/memory.h>
20#endif
21
22/* PAGE_OFFSET - the virtual address of the start of the kernel image */
23#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
24
25#ifdef CONFIG_MMU
26
27/*
28 * TASK_SIZE - the maximum size of a user space task.
29 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
30 */
31#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
32#define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
33
34/*
35 * The maximum size of a 26-bit user space task.
36 */
37#define TASK_SIZE_26 (UL(1) << 26)
38
39/*
40 * The module space lives between the addresses given by TASK_SIZE
41 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
42 */
43#ifndef CONFIG_THUMB2_KERNEL
44#define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
45#else
46/* smaller range for Thumb-2 symbols relocation (2^24)*/
47#define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
48#endif
49
50#if TASK_SIZE > MODULES_VADDR
51#error Top of user space clashes with start of module space
52#endif
53
54/*
55 * The highmem pkmap virtual space shares the end of the module area.
56 */
57#ifdef CONFIG_HIGHMEM
58#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
59#else
60#define MODULES_END (PAGE_OFFSET)
61#endif
62
63/*
64 * The XIP kernel gets mapped at the bottom of the module vm area.
65 * Since we use sections to map it, this macro replaces the physical address
66 * with its virtual address while keeping offset from the base section.
67 */
68#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
69
70#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
71/*
72 * Allow 16MB-aligned ioremap pages
73 */
74#define IOREMAP_MAX_ORDER 24
75#endif
76
77#define VECTORS_BASE UL(0xffff0000)
78
79#else /* CONFIG_MMU */
80
81#ifndef __ASSEMBLY__
82extern unsigned long setup_vectors_base(void);
83extern unsigned long vectors_base;
84#define VECTORS_BASE vectors_base
85#endif
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#define TASK_SIZE UL(0xffffffff)
94
95#ifndef TASK_UNMAPPED_BASE
96#define TASK_UNMAPPED_BASE UL(0x00000000)
97#endif
98
99#ifndef END_MEM
100#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
101#endif
102
103/*
104 * The module can be at any place in ram in nommu mode.
105 */
106#define MODULES_END (END_MEM)
107#define MODULES_VADDR PAGE_OFFSET
108
109#define XIP_VIRT_ADDR(physaddr) (physaddr)
110
111#endif /* !CONFIG_MMU */
112
113#ifdef CONFIG_XIP_KERNEL
114#define KERNEL_START _sdata
115#else
116#define KERNEL_START _stext
117#endif
118#define KERNEL_END _end
119
120/*
121 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
122 * locations
123 */
124#ifdef CONFIG_HAVE_TCM
125#define ITCM_OFFSET UL(0xfffe0000)
126#define DTCM_OFFSET UL(0xfffe8000)
127#endif
128
129/*
130 * Convert a page to/from a physical address
131 */
132#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
133#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
134
135/*
136 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
137 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
138 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
139 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
140 */
141#define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
142
143#ifdef CONFIG_XIP_KERNEL
144/*
145 * When referencing data in RAM from the XIP region in a relative manner
146 * with the MMU off, we need the relative offset between the two physical
147 * addresses. The macro below achieves this, which is:
148 * __pa(v_data) - __xip_pa(v_text)
149 */
150#define PHYS_RELATIVE(v_data, v_text) \
151 (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \
152 ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \
153 CONFIG_XIP_PHYS_ADDR))
154#else
155#define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))
156#endif
157
158#ifndef __ASSEMBLY__
159
160/*
161 * Physical vs virtual RAM address space conversion. These are
162 * private definitions which should NOT be used outside memory.h
163 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
164 *
165 * PFNs are used to describe any physical page; this means
166 * PFN 0 == physical address 0.
167 */
168
169#if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
170
171/*
172 * Constants used to force the right instruction encodings and shifts
173 * so that all we need to do is modify the 8-bit constant field.
174 */
175#define __PV_BITS_31_24 0x81000000
176#define __PV_BITS_7_0 0x81
177
178extern unsigned long __pv_phys_pfn_offset;
179extern u64 __pv_offset;
180extern void fixup_pv_table(const void *, unsigned long);
181extern const void *__pv_table_begin, *__pv_table_end;
182
183#define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
184#define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
185
186#define __pv_stub(from,to,instr,type) \
187 __asm__("@ __pv_stub\n" \
188 "1: " instr " %0, %1, %2\n" \
189 " .pushsection .pv_table,\"a\"\n" \
190 " .long 1b\n" \
191 " .popsection\n" \
192 : "=r" (to) \
193 : "r" (from), "I" (type))
194
195#define __pv_stub_mov_hi(t) \
196 __asm__ volatile("@ __pv_stub_mov\n" \
197 "1: mov %R0, %1\n" \
198 " .pushsection .pv_table,\"a\"\n" \
199 " .long 1b\n" \
200 " .popsection\n" \
201 : "=r" (t) \
202 : "I" (__PV_BITS_7_0))
203
204#define __pv_add_carry_stub(x, y) \
205 __asm__ volatile("@ __pv_add_carry_stub\n" \
206 "1: adds %Q0, %1, %2\n" \
207 " adc %R0, %R0, #0\n" \
208 " .pushsection .pv_table,\"a\"\n" \
209 " .long 1b\n" \
210 " .popsection\n" \
211 : "+r" (y) \
212 : "r" (x), "I" (__PV_BITS_31_24) \
213 : "cc")
214
215static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
216{
217 phys_addr_t t;
218
219 if (sizeof(phys_addr_t) == 4) {
220 __pv_stub(x, t, "add", __PV_BITS_31_24);
221 } else {
222 __pv_stub_mov_hi(t);
223 __pv_add_carry_stub(x, t);
224 }
225 return t;
226}
227
228static inline unsigned long __phys_to_virt(phys_addr_t x)
229{
230 unsigned long t;
231
232 /*
233 * 'unsigned long' cast discard upper word when
234 * phys_addr_t is 64 bit, and makes sure that inline
235 * assembler expression receives 32 bit argument
236 * in place where 'r' 32 bit operand is expected.
237 */
238 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
239 return t;
240}
241
242#else
243
244#define PHYS_OFFSET PLAT_PHYS_OFFSET
245#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
246
247static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
248{
249 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
250}
251
252static inline unsigned long __phys_to_virt(phys_addr_t x)
253{
254 return x - PHYS_OFFSET + PAGE_OFFSET;
255}
256
257#endif
258
259#define virt_to_pfn(kaddr) \
260 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
261 PHYS_PFN_OFFSET)
262
263#define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x))
264
265#ifdef CONFIG_DEBUG_VIRTUAL
266extern phys_addr_t __virt_to_phys(unsigned long x);
267extern phys_addr_t __phys_addr_symbol(unsigned long x);
268#else
269#define __virt_to_phys(x) __virt_to_phys_nodebug(x)
270#define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
271#endif
272
273/*
274 * These are *only* valid on the kernel direct mapped RAM memory.
275 * Note: Drivers should NOT use these. They are the wrong
276 * translation for translating DMA addresses. Use the driver
277 * DMA support - see dma-mapping.h.
278 */
279#define virt_to_phys virt_to_phys
280static inline phys_addr_t virt_to_phys(const volatile void *x)
281{
282 return __virt_to_phys((unsigned long)(x));
283}
284
285#define phys_to_virt phys_to_virt
286static inline void *phys_to_virt(phys_addr_t x)
287{
288 return (void *)__phys_to_virt(x);
289}
290
291/*
292 * Drivers should NOT use these either.
293 */
294#define __pa(x) __virt_to_phys((unsigned long)(x))
295#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
296#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
297#define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
298
299extern long long arch_phys_to_idmap_offset;
300
301/*
302 * These are for systems that have a hardware interconnect supported alias
303 * of physical memory for idmap purposes. Most cases should leave these
304 * untouched. Note: this can only return addresses less than 4GiB.
305 */
306static inline bool arm_has_idmap_alias(void)
307{
308 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
309}
310
311#define IDMAP_INVALID_ADDR ((u32)~0)
312
313static inline unsigned long phys_to_idmap(phys_addr_t addr)
314{
315 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
316 addr += arch_phys_to_idmap_offset;
317 if (addr > (u32)~0)
318 addr = IDMAP_INVALID_ADDR;
319 }
320 return addr;
321}
322
323static inline phys_addr_t idmap_to_phys(unsigned long idmap)
324{
325 phys_addr_t addr = idmap;
326
327 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
328 addr -= arch_phys_to_idmap_offset;
329
330 return addr;
331}
332
333static inline unsigned long __virt_to_idmap(unsigned long x)
334{
335 return phys_to_idmap(__virt_to_phys(x));
336}
337
338#define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
339
340/*
341 * Virtual <-> DMA view memory address translations
342 * Again, these are *only* valid on the kernel direct mapped RAM
343 * memory. Use of these is *deprecated* (and that doesn't mean
344 * use the __ prefixed forms instead.) See dma-mapping.h.
345 */
346#ifndef __virt_to_bus
347#define __virt_to_bus __virt_to_phys
348#define __bus_to_virt __phys_to_virt
349#define __pfn_to_bus(x) __pfn_to_phys(x)
350#define __bus_to_pfn(x) __phys_to_pfn(x)
351#endif
352
353/*
354 * Conversion between a struct page and a physical address.
355 *
356 * page_to_pfn(page) convert a struct page * to a PFN number
357 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
358 *
359 * virt_to_page(k) convert a _valid_ virtual address to struct page *
360 * virt_addr_valid(k) indicates whether a virtual address is valid
361 */
362#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
363
364#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
365#define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
366 && pfn_valid(virt_to_pfn(kaddr)))
367
368#endif
369
370#include <asm-generic/memory_model.h>
371
372#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#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