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__
102 extern unsigned long setup_vectors_base(void);
103 extern 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 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
152 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
153 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
154 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
155 */
156 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
157
158 #ifndef __ASSEMBLY__
159
160 /*
161 * Physical start and end address of the kernel sections. These addresses are
162 * 2MB-aligned to match the section mappings placed over the kernel. We use
163 * u64 so that LPAE mappings beyond the 32bit limit will work out as well.
164 */
165 extern u64 kernel_sec_start;
166 extern u64 kernel_sec_end;
167
168 /*
169 * Physical vs virtual RAM address space conversion. These are
170 * private definitions which should NOT be used outside memory.h
171 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
172 *
173 * PFNs are used to describe any physical page; this means
174 * PFN 0 == physical address 0.
175 */
176
177 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
178
179 /*
180 * Constants used to force the right instruction encodings and shifts
181 * so that all we need to do is modify the 8-bit constant field.
182 */
183 #define __PV_BITS_31_24 0x81000000
184 #define __PV_BITS_23_16 0x810000
185 #define __PV_BITS_7_0 0x81
186
187 extern unsigned long __pv_phys_pfn_offset;
188 extern u64 __pv_offset;
189 extern void fixup_pv_table(const void *, unsigned long);
190 extern const void *__pv_table_begin, *__pv_table_end;
191
192 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
193 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
194
195 #ifndef CONFIG_THUMB2_KERNEL
196 #define __pv_stub(from,to,instr) \
197 __asm__("@ __pv_stub\n" \
198 "1: " instr " %0, %1, %2\n" \
199 "2: " instr " %0, %0, %3\n" \
200 " .pushsection .pv_table,\"a\"\n" \
201 " .long 1b - ., 2b - .\n" \
202 " .popsection\n" \
203 : "=r" (to) \
204 : "r" (from), "I" (__PV_BITS_31_24), \
205 "I"(__PV_BITS_23_16))
206
207 #define __pv_add_carry_stub(x, y) \
208 __asm__("@ __pv_add_carry_stub\n" \
209 "0: movw %R0, #0\n" \
210 " adds %Q0, %1, %R0, lsl #20\n" \
211 "1: mov %R0, %2\n" \
212 " adc %R0, %R0, #0\n" \
213 " .pushsection .pv_table,\"a\"\n" \
214 " .long 0b - ., 1b - .\n" \
215 " .popsection\n" \
216 : "=&r" (y) \
217 : "r" (x), "I" (__PV_BITS_7_0) \
218 : "cc")
219
220 #else
221 #define __pv_stub(from,to,instr) \
222 __asm__("@ __pv_stub\n" \
223 "0: movw %0, #0\n" \
224 " lsl %0, #21\n" \
225 " " instr " %0, %1, %0\n" \
226 " .pushsection .pv_table,\"a\"\n" \
227 " .long 0b - .\n" \
228 " .popsection\n" \
229 : "=&r" (to) \
230 : "r" (from))
231
232 #define __pv_add_carry_stub(x, y) \
233 __asm__("@ __pv_add_carry_stub\n" \
234 "0: movw %R0, #0\n" \
235 " lsls %R0, #21\n" \
236 " adds %Q0, %1, %R0\n" \
237 "1: mvn %R0, #0\n" \
238 " adc %R0, %R0, #0\n" \
239 " .pushsection .pv_table,\"a\"\n" \
240 " .long 0b - ., 1b - .\n" \
241 " .popsection\n" \
242 : "=&r" (y) \
243 : "r" (x) \
244 : "cc")
245 #endif
246
__virt_to_phys_nodebug(unsigned long x)247 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
248 {
249 phys_addr_t t;
250
251 if (sizeof(phys_addr_t) == 4) {
252 __pv_stub(x, t, "add");
253 } else {
254 __pv_add_carry_stub(x, t);
255 }
256 return t;
257 }
258
__phys_to_virt(phys_addr_t x)259 static inline unsigned long __phys_to_virt(phys_addr_t x)
260 {
261 unsigned long t;
262
263 /*
264 * 'unsigned long' cast discard upper word when
265 * phys_addr_t is 64 bit, and makes sure that inline
266 * assembler expression receives 32 bit argument
267 * in place where 'r' 32 bit operand is expected.
268 */
269 __pv_stub((unsigned long) x, t, "sub");
270 return t;
271 }
272
273 #else
274
275 #define PHYS_OFFSET PLAT_PHYS_OFFSET
276 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
277
__virt_to_phys_nodebug(unsigned long x)278 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
279 {
280 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
281 }
282
__phys_to_virt(phys_addr_t x)283 static inline unsigned long __phys_to_virt(phys_addr_t x)
284 {
285 return x - PHYS_OFFSET + PAGE_OFFSET;
286 }
287
288 #endif
289
virt_to_pfn(const void * p)290 static inline unsigned long virt_to_pfn(const void *p)
291 {
292 unsigned long kaddr = (unsigned long)p;
293 return (((kaddr - PAGE_OFFSET) >> PAGE_SHIFT) +
294 PHYS_PFN_OFFSET);
295 }
296 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x))
297
298 #ifdef CONFIG_DEBUG_VIRTUAL
299 extern phys_addr_t __virt_to_phys(unsigned long x);
300 extern phys_addr_t __phys_addr_symbol(unsigned long x);
301 #else
302 #define __virt_to_phys(x) __virt_to_phys_nodebug(x)
303 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
304 #endif
305
306 /*
307 * These are *only* valid on the kernel direct mapped RAM memory.
308 * Note: Drivers should NOT use these. They are the wrong
309 * translation for translating DMA addresses. Use the driver
310 * DMA support - see dma-mapping.h.
311 */
312 #define virt_to_phys virt_to_phys
virt_to_phys(const volatile void * x)313 static inline phys_addr_t virt_to_phys(const volatile void *x)
314 {
315 return __virt_to_phys((unsigned long)(x));
316 }
317
318 #define phys_to_virt phys_to_virt
phys_to_virt(phys_addr_t x)319 static inline void *phys_to_virt(phys_addr_t x)
320 {
321 return (void *)__phys_to_virt(x);
322 }
323
324 /*
325 * Drivers should NOT use these either.
326 */
327 #define __pa(x) __virt_to_phys((unsigned long)(x))
328 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
329 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
330 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
331
332 extern long long arch_phys_to_idmap_offset;
333
334 /*
335 * These are for systems that have a hardware interconnect supported alias
336 * of physical memory for idmap purposes. Most cases should leave these
337 * untouched. Note: this can only return addresses less than 4GiB.
338 */
arm_has_idmap_alias(void)339 static inline bool arm_has_idmap_alias(void)
340 {
341 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
342 }
343
344 #define IDMAP_INVALID_ADDR ((u32)~0)
345
phys_to_idmap(phys_addr_t addr)346 static inline unsigned long phys_to_idmap(phys_addr_t addr)
347 {
348 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
349 addr += arch_phys_to_idmap_offset;
350 if (addr > (u32)~0)
351 addr = IDMAP_INVALID_ADDR;
352 }
353 return addr;
354 }
355
idmap_to_phys(unsigned long idmap)356 static inline phys_addr_t idmap_to_phys(unsigned long idmap)
357 {
358 phys_addr_t addr = idmap;
359
360 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
361 addr -= arch_phys_to_idmap_offset;
362
363 return addr;
364 }
365
__virt_to_idmap(unsigned long x)366 static inline unsigned long __virt_to_idmap(unsigned long x)
367 {
368 return phys_to_idmap(__virt_to_phys(x));
369 }
370
371 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
372
373 /*
374 * Conversion between a struct page and a physical address.
375 *
376 * page_to_pfn(page) convert a struct page * to a PFN number
377 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
378 *
379 * virt_to_page(k) convert a _valid_ virtual address to struct page *
380 * virt_addr_valid(k) indicates whether a virtual address is valid
381 */
382 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
383
384 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
385 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
386 && pfn_valid(virt_to_pfn(kaddr)))
387
388 #endif
389
390 #endif
391