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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#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