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 * 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 */
171 extern u64 kernel_sec_start;
172 extern 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
193 extern unsigned long __pv_phys_pfn_offset;
194 extern u64 __pv_offset;
195 extern void fixup_pv_table(const void *, unsigned long);
196 extern 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
__virt_to_phys_nodebug(unsigned long x)253 static 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
__phys_to_virt(phys_addr_t x)265 static 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
__virt_to_phys_nodebug(unsigned long x)284 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
285 {
286 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
287 }
288
__phys_to_virt(phys_addr_t x)289 static inline unsigned long __phys_to_virt(phys_addr_t x)
290 {
291 return x - PHYS_OFFSET + PAGE_OFFSET;
292 }
293
294 #endif
295
virt_to_pfn(const void * p)296 static 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
305 extern phys_addr_t __virt_to_phys(unsigned long x);
306 extern 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
virt_to_phys(const volatile void * x)319 static 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
phys_to_virt(phys_addr_t x)325 static 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
338 extern 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 */
arm_has_idmap_alias(void)345 static 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
phys_to_idmap(phys_addr_t addr)352 static 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
idmap_to_phys(unsigned long idmap)362 static 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
__virt_to_idmap(unsigned long x)372 static 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
397