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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 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 * 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 */
165extern u64 kernel_sec_start;
166extern 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
187extern unsigned long __pv_phys_pfn_offset;
188extern u64 __pv_offset;
189extern void fixup_pv_table(const void *, unsigned long);
190extern 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
247static 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
259static 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
278static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
279{
280 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
281}
282
283static inline unsigned long __phys_to_virt(phys_addr_t x)
284{
285 return x - PHYS_OFFSET + PAGE_OFFSET;
286}
287
288#endif
289
290static 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
299extern phys_addr_t __virt_to_phys(unsigned long x);
300extern 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
313static 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
319static 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
332extern 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 */
339static 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
346static 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
356static 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
366static 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