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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 <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/* 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 explicitly, include <asm/page.h>
9 * to get access to these definitions.
10 */
11#ifndef __ASM_ARM_MEMORY_H
12#define __ASM_ARM_MEMORY_H
13
14#ifndef _ASMARM_PAGE_H
15#error "Do not include <asm/memory.h> directly"
16#endif
17
18#include <linux/compiler.h>
19#include <linux/const.h>
20#include <linux/types.h>
21#include <linux/sizes.h>
22
23#ifdef CONFIG_NEED_MACH_MEMORY_H
24#include <mach/memory.h>
25#endif
26#include <asm/kasan_def.h>
27
28/*
29 * PAGE_OFFSET: the virtual address of the start of lowmem, memory above
30 * the virtual address range for userspace.
31 * KERNEL_OFFSET: the virtual address of the start of the kernel image.
32 * we may further offset this with TEXT_OFFSET in practice.
33 */
34#define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
35#define KERNEL_OFFSET (PAGE_OFFSET)
36
37#ifdef CONFIG_MMU
38
39/*
40 * TASK_SIZE - the maximum size of a user space task.
41 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
42 */
43#ifndef CONFIG_KASAN
44#define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
45#else
46#define TASK_SIZE (KASAN_SHADOW_START)
47#endif
48#define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
49
50/*
51 * The maximum size of a 26-bit user space task.
52 */
53#define TASK_SIZE_26 (UL(1) << 26)
54
55/*
56 * The module space lives between the addresses given by TASK_SIZE
57 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
58 */
59#ifndef CONFIG_THUMB2_KERNEL
60#define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
61#else
62/* smaller range for Thumb-2 symbols relocation (2^24)*/
63#define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
64#endif
65
66#if TASK_SIZE > MODULES_VADDR
67#error Top of user space clashes with start of module space
68#endif
69
70/*
71 * The highmem pkmap virtual space shares the end of the module area.
72 */
73#ifdef CONFIG_HIGHMEM
74#define MODULES_END (PAGE_OFFSET - PMD_SIZE)
75#else
76#define MODULES_END (PAGE_OFFSET)
77#endif
78
79/*
80 * The XIP kernel gets mapped at the bottom of the module vm area.
81 * Since we use sections to map it, this macro replaces the physical address
82 * with its virtual address while keeping offset from the base section.
83 */
84#define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
85
86#define FDT_FIXED_BASE UL(0xff800000)
87#define FDT_FIXED_SIZE (2 * SECTION_SIZE)
88#define FDT_VIRT_BASE(physbase) ((void *)(FDT_FIXED_BASE | (physbase) % SECTION_SIZE))
89
90#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
91/*
92 * Allow 16MB-aligned ioremap pages
93 */
94#define IOREMAP_MAX_ORDER 24
95#endif
96
97#define VECTORS_BASE UL(0xffff0000)
98
99#else /* CONFIG_MMU */
100
101#ifndef __ASSEMBLY__
102extern unsigned long setup_vectors_base(void);
103extern unsigned long vectors_base;
104#define VECTORS_BASE vectors_base
105#endif
106
107/*
108 * The limitation of user task size can grow up to the end of free ram region.
109 * It is difficult to define and perhaps will never meet the original meaning
110 * of this define that was meant to.
111 * Fortunately, there is no reference for this in noMMU mode, for now.
112 */
113#define TASK_SIZE UL(0xffffffff)
114
115#ifndef TASK_UNMAPPED_BASE
116#define TASK_UNMAPPED_BASE UL(0x00000000)
117#endif
118
119#ifndef END_MEM
120#define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
121#endif
122
123/*
124 * The module can be at any place in ram in nommu mode.
125 */
126#define MODULES_END (END_MEM)
127#define MODULES_VADDR PAGE_OFFSET
128
129#define XIP_VIRT_ADDR(physaddr) (physaddr)
130#define FDT_VIRT_BASE(physbase) ((void *)(physbase))
131
132#endif /* !CONFIG_MMU */
133
134#ifdef CONFIG_XIP_KERNEL
135#define KERNEL_START _sdata
136#else
137#define KERNEL_START _stext
138#endif
139#define KERNEL_END _end
140
141/*
142 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
143 * locations
144 */
145#ifdef CONFIG_HAVE_TCM
146#define ITCM_OFFSET UL(0xfffe0000)
147#define DTCM_OFFSET UL(0xfffe8000)
148#endif
149
150/*
151 * Convert a page to/from a physical address
152 */
153#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
154#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
155
156/*
157 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
158 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
159 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
160 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
161 */
162#define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
163
164#ifndef __ASSEMBLY__
165
166/*
167 * Physical start and end address of the kernel sections. These addresses are
168 * 2MB-aligned to match the section mappings placed over the kernel. We use
169 * u64 so that LPAE mappings beyond the 32bit limit will work out as well.
170 */
171extern u64 kernel_sec_start;
172extern u64 kernel_sec_end;
173
174/*
175 * Physical vs virtual RAM address space conversion. These are
176 * private definitions which should NOT be used outside memory.h
177 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
178 *
179 * PFNs are used to describe any physical page; this means
180 * PFN 0 == physical address 0.
181 */
182
183#if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
184
185/*
186 * Constants used to force the right instruction encodings and shifts
187 * so that all we need to do is modify the 8-bit constant field.
188 */
189#define __PV_BITS_31_24 0x81000000
190#define __PV_BITS_23_16 0x810000
191#define __PV_BITS_7_0 0x81
192
193extern unsigned long __pv_phys_pfn_offset;
194extern u64 __pv_offset;
195extern void fixup_pv_table(const void *, unsigned long);
196extern const void *__pv_table_begin, *__pv_table_end;
197
198#define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
199#define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
200
201#ifndef CONFIG_THUMB2_KERNEL
202#define __pv_stub(from,to,instr) \
203 __asm__("@ __pv_stub\n" \
204 "1: " instr " %0, %1, %2\n" \
205 "2: " instr " %0, %0, %3\n" \
206 " .pushsection .pv_table,\"a\"\n" \
207 " .long 1b - ., 2b - .\n" \
208 " .popsection\n" \
209 : "=r" (to) \
210 : "r" (from), "I" (__PV_BITS_31_24), \
211 "I"(__PV_BITS_23_16))
212
213#define __pv_add_carry_stub(x, y) \
214 __asm__("@ __pv_add_carry_stub\n" \
215 "0: movw %R0, #0\n" \
216 " adds %Q0, %1, %R0, lsl #20\n" \
217 "1: mov %R0, %2\n" \
218 " adc %R0, %R0, #0\n" \
219 " .pushsection .pv_table,\"a\"\n" \
220 " .long 0b - ., 1b - .\n" \
221 " .popsection\n" \
222 : "=&r" (y) \
223 : "r" (x), "I" (__PV_BITS_7_0) \
224 : "cc")
225
226#else
227#define __pv_stub(from,to,instr) \
228 __asm__("@ __pv_stub\n" \
229 "0: movw %0, #0\n" \
230 " lsl %0, #21\n" \
231 " " instr " %0, %1, %0\n" \
232 " .pushsection .pv_table,\"a\"\n" \
233 " .long 0b - .\n" \
234 " .popsection\n" \
235 : "=&r" (to) \
236 : "r" (from))
237
238#define __pv_add_carry_stub(x, y) \
239 __asm__("@ __pv_add_carry_stub\n" \
240 "0: movw %R0, #0\n" \
241 " lsls %R0, #21\n" \
242 " adds %Q0, %1, %R0\n" \
243 "1: mvn %R0, #0\n" \
244 " adc %R0, %R0, #0\n" \
245 " .pushsection .pv_table,\"a\"\n" \
246 " .long 0b - ., 1b - .\n" \
247 " .popsection\n" \
248 : "=&r" (y) \
249 : "r" (x) \
250 : "cc")
251#endif
252
253static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
254{
255 phys_addr_t t;
256
257 if (sizeof(phys_addr_t) == 4) {
258 __pv_stub(x, t, "add");
259 } else {
260 __pv_add_carry_stub(x, t);
261 }
262 return t;
263}
264
265static inline unsigned long __phys_to_virt(phys_addr_t x)
266{
267 unsigned long t;
268
269 /*
270 * 'unsigned long' cast discard upper word when
271 * phys_addr_t is 64 bit, and makes sure that inline
272 * assembler expression receives 32 bit argument
273 * in place where 'r' 32 bit operand is expected.
274 */
275 __pv_stub((unsigned long) x, t, "sub");
276 return t;
277}
278
279#else
280
281#define PHYS_OFFSET PLAT_PHYS_OFFSET
282#define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
283
284static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
285{
286 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
287}
288
289static inline unsigned long __phys_to_virt(phys_addr_t x)
290{
291 return x - PHYS_OFFSET + PAGE_OFFSET;
292}
293
294#endif
295
296static inline unsigned long virt_to_pfn(const void *p)
297{
298 unsigned long kaddr = (unsigned long)p;
299 return (((kaddr - PAGE_OFFSET) >> PAGE_SHIFT) +
300 PHYS_PFN_OFFSET);
301}
302#define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x))
303
304#ifdef CONFIG_DEBUG_VIRTUAL
305extern phys_addr_t __virt_to_phys(unsigned long x);
306extern phys_addr_t __phys_addr_symbol(unsigned long x);
307#else
308#define __virt_to_phys(x) __virt_to_phys_nodebug(x)
309#define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
310#endif
311
312/*
313 * These are *only* valid on the kernel direct mapped RAM memory.
314 * Note: Drivers should NOT use these. They are the wrong
315 * translation for translating DMA addresses. Use the driver
316 * DMA support - see dma-mapping.h.
317 */
318#define virt_to_phys virt_to_phys
319static inline phys_addr_t virt_to_phys(const volatile void *x)
320{
321 return __virt_to_phys((unsigned long)(x));
322}
323
324#define phys_to_virt phys_to_virt
325static inline void *phys_to_virt(phys_addr_t x)
326{
327 return (void *)__phys_to_virt(x);
328}
329
330/*
331 * Drivers should NOT use these either.
332 */
333#define __pa(x) __virt_to_phys((unsigned long)(x))
334#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
335#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
336#define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
337
338extern long long arch_phys_to_idmap_offset;
339
340/*
341 * These are for systems that have a hardware interconnect supported alias
342 * of physical memory for idmap purposes. Most cases should leave these
343 * untouched. Note: this can only return addresses less than 4GiB.
344 */
345static inline bool arm_has_idmap_alias(void)
346{
347 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
348}
349
350#define IDMAP_INVALID_ADDR ((u32)~0)
351
352static inline unsigned long phys_to_idmap(phys_addr_t addr)
353{
354 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
355 addr += arch_phys_to_idmap_offset;
356 if (addr > (u32)~0)
357 addr = IDMAP_INVALID_ADDR;
358 }
359 return addr;
360}
361
362static inline phys_addr_t idmap_to_phys(unsigned long idmap)
363{
364 phys_addr_t addr = idmap;
365
366 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
367 addr -= arch_phys_to_idmap_offset;
368
369 return addr;
370}
371
372static inline unsigned long __virt_to_idmap(unsigned long x)
373{
374 return phys_to_idmap(__virt_to_phys(x));
375}
376
377#define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
378
379/*
380 * Conversion between a struct page and a physical address.
381 *
382 * page_to_pfn(page) convert a struct page * to a PFN number
383 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
384 *
385 * virt_to_page(k) convert a _valid_ virtual address to struct page *
386 * virt_addr_valid(k) indicates whether a virtual address is valid
387 */
388#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
389
390#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
391#define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
392 && pfn_valid(virt_to_pfn(kaddr)))
393
394#endif
395
396#endif