summaryrefslogtreecommitdiff
path: root/arch/arm/include/asm/memory.h
blob: cfc9dfd70aad29ec0b10cc591fafe0be97688c08 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  arch/arm/include/asm/memory.h
 *
 *  Copyright (C) 2000-2002 Russell King
 *  modification for nommu, Hyok S. Choi, 2004
 *
 *  Note: this file should not be included by non-asm/.h files
 */
#ifndef __ASM_ARM_MEMORY_H
#define __ASM_ARM_MEMORY_H

#include <linux/compiler.h>
#include <linux/const.h>
#include <linux/types.h>
#include <linux/sizes.h>

#ifdef CONFIG_NEED_MACH_MEMORY_H
#include <mach/memory.h>
#endif
#include <asm/kasan_def.h>

/*
 * PAGE_OFFSET: the virtual address of the start of lowmem, memory above
 *   the virtual address range for userspace.
 * KERNEL_OFFSET: the virtual address of the start of the kernel image.
 *   we may further offset this with TEXT_OFFSET in practice.
 */
#define PAGE_OFFSET		UL(CONFIG_PAGE_OFFSET)
#define KERNEL_OFFSET		(PAGE_OFFSET)

#ifdef CONFIG_MMU

/*
 * TASK_SIZE - the maximum size of a user space task.
 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
 */
#ifndef CONFIG_KASAN
#define TASK_SIZE		(UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
#else
#define TASK_SIZE		(KASAN_SHADOW_START)
#endif
#define TASK_UNMAPPED_BASE	ALIGN(TASK_SIZE / 3, SZ_16M)

/*
 * The maximum size of a 26-bit user space task.
 */
#define TASK_SIZE_26		(UL(1) << 26)

/*
 * The module space lives between the addresses given by TASK_SIZE
 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
 */
#ifndef CONFIG_THUMB2_KERNEL
#define MODULES_VADDR		(PAGE_OFFSET - SZ_16M)
#else
/* smaller range for Thumb-2 symbols relocation (2^24)*/
#define MODULES_VADDR		(PAGE_OFFSET - SZ_8M)
#endif

#if TASK_SIZE > MODULES_VADDR
#error Top of user space clashes with start of module space
#endif

/*
 * The highmem pkmap virtual space shares the end of the module area.
 */
#ifdef CONFIG_HIGHMEM
#define MODULES_END		(PAGE_OFFSET - PMD_SIZE)
#else
#define MODULES_END		(PAGE_OFFSET)
#endif

/*
 * The XIP kernel gets mapped at the bottom of the module vm area.
 * Since we use sections to map it, this macro replaces the physical address
 * with its virtual address while keeping offset from the base section.
 */
#define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))

#define FDT_FIXED_BASE		UL(0xff800000)
#define FDT_FIXED_SIZE		(2 * SECTION_SIZE)
#define FDT_VIRT_BASE(physbase)	((void *)(FDT_FIXED_BASE | (physbase) % SECTION_SIZE))

#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
/*
 * Allow 16MB-aligned ioremap pages
 */
#define IOREMAP_MAX_ORDER	24
#endif

#define VECTORS_BASE		UL(0xffff0000)

#else /* CONFIG_MMU */

#ifndef __ASSEMBLY__
extern unsigned long setup_vectors_base(void);
extern unsigned long vectors_base;
#define VECTORS_BASE		vectors_base
#endif

/*
 * The limitation of user task size can grow up to the end of free ram region.
 * It is difficult to define and perhaps will never meet the original meaning
 * of this define that was meant to.
 * Fortunately, there is no reference for this in noMMU mode, for now.
 */
#define TASK_SIZE		UL(0xffffffff)

#ifndef TASK_UNMAPPED_BASE
#define TASK_UNMAPPED_BASE	UL(0x00000000)
#endif

#ifndef END_MEM
#define END_MEM     		(UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
#endif

/*
 * The module can be at any place in ram in nommu mode.
 */
#define MODULES_END		(END_MEM)
#define MODULES_VADDR		PAGE_OFFSET

#define XIP_VIRT_ADDR(physaddr)  (physaddr)
#define FDT_VIRT_BASE(physbase)  ((void *)(physbase))

#endif /* !CONFIG_MMU */

#ifdef CONFIG_XIP_KERNEL
#define KERNEL_START		_sdata
#else
#define KERNEL_START		_stext
#endif
#define KERNEL_END		_end

/*
 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
 * locations
 */
#ifdef CONFIG_HAVE_TCM
#define ITCM_OFFSET	UL(0xfffe0000)
#define DTCM_OFFSET	UL(0xfffe8000)
#endif

/*
 * Convert a page to/from a physical address
 */
#define page_to_phys(page)	(__pfn_to_phys(page_to_pfn(page)))
#define phys_to_page(phys)	(pfn_to_page(__phys_to_pfn(phys)))

/*
 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
 * memory.  This is used for XIP and NoMMU kernels, and on platforms that don't
 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
 */
#define PLAT_PHYS_OFFSET	UL(CONFIG_PHYS_OFFSET)

#ifndef __ASSEMBLY__

/*
 * Physical start and end address of the kernel sections. These addresses are
 * 2MB-aligned to match the section mappings placed over the kernel.
 */
extern u32 kernel_sec_start;
extern u32 kernel_sec_end;

/*
 * Physical vs virtual RAM address space conversion.  These are
 * private definitions which should NOT be used outside memory.h
 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 *
 * PFNs are used to describe any physical page; this means
 * PFN 0 == physical address 0.
 */

#if defined(CONFIG_ARM_PATCH_PHYS_VIRT)

/*
 * Constants used to force the right instruction encodings and shifts
 * so that all we need to do is modify the 8-bit constant field.
 */
#define __PV_BITS_31_24	0x81000000
#define __PV_BITS_23_16	0x810000
#define __PV_BITS_7_0	0x81

extern unsigned long __pv_phys_pfn_offset;
extern u64 __pv_offset;
extern void fixup_pv_table(const void *, unsigned long);
extern const void *__pv_table_begin, *__pv_table_end;

#define PHYS_OFFSET	((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
#define PHYS_PFN_OFFSET	(__pv_phys_pfn_offset)

#ifndef CONFIG_THUMB2_KERNEL
#define __pv_stub(from,to,instr)			\
	__asm__("@ __pv_stub\n"				\
	"1:	" instr "	%0, %1, %2\n"		\
	"2:	" instr "	%0, %0, %3\n"		\
	"	.pushsection .pv_table,\"a\"\n"		\
	"	.long	1b - ., 2b - .\n"		\
	"	.popsection\n"				\
	: "=r" (to)					\
	: "r" (from), "I" (__PV_BITS_31_24),		\
	  "I"(__PV_BITS_23_16))

#define __pv_add_carry_stub(x, y)			\
	__asm__("@ __pv_add_carry_stub\n"		\
	"0:	movw	%R0, #0\n"			\
	"	adds	%Q0, %1, %R0, lsl #20\n"	\
	"1:	mov	%R0, %2\n"			\
	"	adc	%R0, %R0, #0\n"			\
	"	.pushsection .pv_table,\"a\"\n"		\
	"	.long	0b - ., 1b - .\n"		\
	"	.popsection\n"				\
	: "=&r" (y)					\
	: "r" (x), "I" (__PV_BITS_7_0)			\
	: "cc")

#else
#define __pv_stub(from,to,instr)			\
	__asm__("@ __pv_stub\n"				\
	"0:	movw	%0, #0\n"			\
	"	lsl	%0, #21\n"			\
	"	" instr " %0, %1, %0\n"			\
	"	.pushsection .pv_table,\"a\"\n"		\
	"	.long	0b - .\n"			\
	"	.popsection\n"				\
	: "=&r" (to)					\
	: "r" (from))

#define __pv_add_carry_stub(x, y)			\
	__asm__("@ __pv_add_carry_stub\n"		\
	"0:	movw	%R0, #0\n"			\
	"	lsls	%R0, #21\n"			\
	"	adds	%Q0, %1, %R0\n"			\
	"1:	mvn	%R0, #0\n"			\
	"	adc	%R0, %R0, #0\n"			\
	"	.pushsection .pv_table,\"a\"\n"		\
	"	.long	0b - ., 1b - .\n"		\
	"	.popsection\n"				\
	: "=&r" (y)					\
	: "r" (x)					\
	: "cc")
#endif

static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
{
	phys_addr_t t;

	if (sizeof(phys_addr_t) == 4) {
		__pv_stub(x, t, "add");
	} else {
		__pv_add_carry_stub(x, t);
	}
	return t;
}

static inline unsigned long __phys_to_virt(phys_addr_t x)
{
	unsigned long t;

	/*
	 * 'unsigned long' cast discard upper word when
	 * phys_addr_t is 64 bit, and makes sure that inline
	 * assembler expression receives 32 bit argument
	 * in place where 'r' 32 bit operand is expected.
	 */
	__pv_stub((unsigned long) x, t, "sub");
	return t;
}

#else

#define PHYS_OFFSET	PLAT_PHYS_OFFSET
#define PHYS_PFN_OFFSET	((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))

static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
{
	return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
}

static inline unsigned long __phys_to_virt(phys_addr_t x)
{
	return x - PHYS_OFFSET + PAGE_OFFSET;
}

#endif

#define virt_to_pfn(kaddr) \
	((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
	 PHYS_PFN_OFFSET)

#define __pa_symbol_nodebug(x)	__virt_to_phys_nodebug((x))

#ifdef CONFIG_DEBUG_VIRTUAL
extern phys_addr_t __virt_to_phys(unsigned long x);
extern phys_addr_t __phys_addr_symbol(unsigned long x);
#else
#define __virt_to_phys(x)	__virt_to_phys_nodebug(x)
#define __phys_addr_symbol(x)	__pa_symbol_nodebug(x)
#endif

/*
 * These are *only* valid on the kernel direct mapped RAM memory.
 * Note: Drivers should NOT use these.  They are the wrong
 * translation for translating DMA addresses.  Use the driver
 * DMA support - see dma-mapping.h.
 */
#define virt_to_phys virt_to_phys
static inline phys_addr_t virt_to_phys(const volatile void *x)
{
	return __virt_to_phys((unsigned long)(x));
}

#define phys_to_virt phys_to_virt
static inline void *phys_to_virt(phys_addr_t x)
{
	return (void *)__phys_to_virt(x);
}

/*
 * Drivers should NOT use these either.
 */
#define __pa(x)			__virt_to_phys((unsigned long)(x))
#define __pa_symbol(x)		__phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
#define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))
#define pfn_to_kaddr(pfn)	__va((phys_addr_t)(pfn) << PAGE_SHIFT)

extern long long arch_phys_to_idmap_offset;

/*
 * These are for systems that have a hardware interconnect supported alias
 * of physical memory for idmap purposes.  Most cases should leave these
 * untouched.  Note: this can only return addresses less than 4GiB.
 */
static inline bool arm_has_idmap_alias(void)
{
	return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
}

#define IDMAP_INVALID_ADDR ((u32)~0)

static inline unsigned long phys_to_idmap(phys_addr_t addr)
{
	if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
		addr += arch_phys_to_idmap_offset;
		if (addr > (u32)~0)
			addr = IDMAP_INVALID_ADDR;
	}
	return addr;
}

static inline phys_addr_t idmap_to_phys(unsigned long idmap)
{
	phys_addr_t addr = idmap;

	if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
		addr -= arch_phys_to_idmap_offset;

	return addr;
}

static inline unsigned long __virt_to_idmap(unsigned long x)
{
	return phys_to_idmap(__virt_to_phys(x));
}

#define virt_to_idmap(x)	__virt_to_idmap((unsigned long)(x))

/*
 * Virtual <-> DMA view memory address translations
 * Again, these are *only* valid on the kernel direct mapped RAM
 * memory.  Use of these is *deprecated* (and that doesn't mean
 * use the __ prefixed forms instead.)  See dma-mapping.h.
 */
#ifndef __virt_to_bus
#define __virt_to_bus	__virt_to_phys
#define __bus_to_virt	__phys_to_virt
#define __pfn_to_bus(x)	__pfn_to_phys(x)
#define __bus_to_pfn(x)	__phys_to_pfn(x)
#endif

/*
 * Conversion between a struct page and a physical address.
 *
 *  page_to_pfn(page)	convert a struct page * to a PFN number
 *  pfn_to_page(pfn)	convert a _valid_ PFN number to struct page *
 *
 *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
 *  virt_addr_valid(k)	indicates whether a virtual address is valid
 */
#define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET

#define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
#define virt_addr_valid(kaddr)	(((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
					&& pfn_valid(virt_to_pfn(kaddr)))

#endif

#include <asm-generic/memory_model.h>

#endif