summaryrefslogtreecommitdiffstats
path: root/arch/arm/include/asm/memory.h
blob: 7e8d22fef29c2455a52f7e84e2b96269203092c8 (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
/*
 *  arch/arm/include/asm/memory.h
 *
 *  Copyright (C) 2000-2002 Russell King
 *  modification for nommu, Hyok S. Choi, 2004
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  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 <mach/memory.h>
#include <asm/sizes.h>

/*
 * Allow for constants defined here to be used from assembly code
 * by prepending the UL suffix only with actual C code compilation.
 */
#define UL(x) _AC(x, UL)

#ifdef CONFIG_MMU

/*
 * PAGE_OFFSET - the virtual address of the start of the kernel image
 * TASK_SIZE - the maximum size of a user space task.
 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
 */
#define PAGE_OFFSET		UL(CONFIG_PAGE_OFFSET)
#define TASK_SIZE		(UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
#define TASK_UNMAPPED_BASE	(UL(CONFIG_PAGE_OFFSET) / 3)

/*
 * The maximum size of a 26-bit user space task.
 */
#define TASK_SIZE_26		UL(0x04000000)

/*
 * The module space lives between the addresses given by TASK_SIZE
 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
 */
#define MODULE_END		(PAGE_OFFSET)
#define MODULE_START		(MODULE_END - 16*1048576)

#if TASK_SIZE > MODULE_START
#error Top of user space clashes with start of module space
#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)  (MODULE_START + ((physaddr) & 0x000fffff))

/*
 * Allow 16MB-aligned ioremap pages
 */
#define IOREMAP_MAX_ORDER	24

#else /* CONFIG_MMU */

/*
 * 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.
 */
#ifndef TASK_SIZE
#define TASK_SIZE		(CONFIG_DRAM_SIZE)
#endif

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

#ifndef PHYS_OFFSET
#define PHYS_OFFSET 		(CONFIG_DRAM_BASE)
#endif

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

#ifndef PAGE_OFFSET
#define PAGE_OFFSET		(PHYS_OFFSET)
#endif

/*
 * The module can be at any place in ram in nommu mode.
 */
#define MODULE_END		(END_MEM)
#define MODULE_START		(PHYS_OFFSET)

#endif /* !CONFIG_MMU */

/*
 * Size of DMA-consistent memory region.  Must be multiple of 2M,
 * between 2MB and 14MB inclusive.
 */
#ifndef CONSISTENT_DMA_SIZE
#define CONSISTENT_DMA_SIZE SZ_2M
#endif

/*
 * 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.
 */
#ifndef __virt_to_phys
#define __virt_to_phys(x)	((x) - PAGE_OFFSET + PHYS_OFFSET)
#define __phys_to_virt(x)	((x) - PHYS_OFFSET + PAGE_OFFSET)
#endif

/*
 * Convert a physical address to a Page Frame Number and back
 */
#define	__phys_to_pfn(paddr)	((paddr) >> PAGE_SHIFT)
#define	__pfn_to_phys(pfn)	((pfn) << PAGE_SHIFT)

#ifndef __ASSEMBLY__

/*
 * The DMA mask corresponding to the maximum bus address allocatable
 * using GFP_DMA.  The default here places no restriction on DMA
 * allocations.  This must be the smallest DMA mask in the system,
 * so a successful GFP_DMA allocation will always satisfy this.
 */
#ifndef ISA_DMA_THRESHOLD
#define ISA_DMA_THRESHOLD	(0xffffffffULL)
#endif

#ifndef arch_adjust_zones
#define arch_adjust_zones(node,size,holes) do { } while (0)
#endif

/*
 * Amount of memory reserved for the vmalloc() area, and minimum
 * address for vmalloc mappings.
 */
extern unsigned long vmalloc_reserve;

#define VMALLOC_MIN		(void *)(VMALLOC_END - vmalloc_reserve)

/*
 * PFNs are used to describe any physical page; this means
 * PFN 0 == physical address 0.
 *
 * This is the PFN of the first RAM page in the kernel
 * direct-mapped view.  We assume this is the first page
 * of RAM in the mem_map as well.
 */
#define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)

/*
 * 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.
 */
static inline unsigned long virt_to_phys(void *x)
{
	return __virt_to_phys((unsigned long)(x));
}

static inline void *phys_to_virt(unsigned long x)
{
	return (void *)(__phys_to_virt((unsigned long)(x)));
}

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

/*
 * 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.
 */
static inline __deprecated unsigned long virt_to_bus(void *x)
{
	return __virt_to_bus((unsigned long)x);
}

static inline __deprecated void *bus_to_virt(unsigned long x)
{
	return (void *)__bus_to_virt(x);
}

/*
 * Conversion between a struct page and a physical address.
 *
 * Note: when converting an unknown physical address to a
 * struct page, the resulting pointer must be validated
 * using VALID_PAGE().  It must return an invalid struct page
 * for any physical address not corresponding to a system
 * RAM 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 *
 *  pfn_valid(pfn)	indicates whether a PFN number is valid
 *
 *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
 *  virt_addr_valid(k)	indicates whether a virtual address is valid
 */
#ifndef CONFIG_DISCONTIGMEM

#define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET

#ifndef CONFIG_SPARSEMEM
#define pfn_valid(pfn)		((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
#endif

#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)

#define PHYS_TO_NID(addr)	(0)

#else /* CONFIG_DISCONTIGMEM */

/*
 * This is more complex.  We have a set of mem_map arrays spread
 * around in memory.
 */
#include <linux/numa.h>

#define arch_pfn_to_nid(pfn)	PFN_TO_NID(pfn)
#define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)

#define pfn_valid(pfn)						\
	({							\
		unsigned int nid = PFN_TO_NID(pfn);		\
		int valid = nid < MAX_NUMNODES;			\
		if (valid) {					\
			pg_data_t *node = NODE_DATA(nid);	\
			valid = (pfn - node->node_start_pfn) <	\
				node->node_spanned_pages;	\
		}						\
		valid;						\
	})

#define virt_to_page(kaddr)					\
	(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))

#define virt_addr_valid(kaddr)	(KVADDR_TO_NID(kaddr) < MAX_NUMNODES)

/*
 * Common discontigmem stuff.
 *  PHYS_TO_NID is used by the ARM kernel/setup.c
 */
#define PHYS_TO_NID(addr)	PFN_TO_NID((addr) >> PAGE_SHIFT)

/*
 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
 * and returns the mem_map of that node.
 */
#define ADDR_TO_MAPBASE(kaddr)	NODE_MEM_MAP(KVADDR_TO_NID(kaddr))

/*
 * Given a page frame number, find the owning node of the memory
 * and returns the mem_map of that node.
 */
#define PFN_TO_MAPBASE(pfn)	NODE_MEM_MAP(PFN_TO_NID(pfn))

#ifdef NODE_MEM_SIZE_BITS
#define NODE_MEM_SIZE_MASK	((1 << NODE_MEM_SIZE_BITS) - 1)

/*
 * Given a kernel address, find the home node of the underlying memory.
 */
#define KVADDR_TO_NID(addr) \
	(((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)

/*
 * Given a page frame number, convert it to a node id.
 */
#define PFN_TO_NID(pfn) \
	(((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))

/*
 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
 * and returns the index corresponding to the appropriate page in the
 * node's mem_map.
 */
#define LOCAL_MAP_NR(addr) \
	(((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)

#endif /* NODE_MEM_SIZE_BITS */

#endif /* !CONFIG_DISCONTIGMEM */

/*
 * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.
 */
#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)

/*
 * Optional coherency support.  Currently used only by selected
 * Intel XSC3-based systems.
 */
#ifndef arch_is_coherent
#define arch_is_coherent()		0
#endif

#endif

#include <asm-generic/memory_model.h>

#endif
OpenPOWER on IntegriCloud