1/*
2 *  linux/include/asm-arm/memory.h
3 *
4 *  Copyright (C) 2000-2002 Russell King
5 *  modification for nommu, Hyok S. Choi, 2004
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *  Note: this file should not be included by non-asm/.h files
12 */
13#ifndef __ASM_ARM_MEMORY_H
14#define __ASM_ARM_MEMORY_H
15
16/*
17 * Allow for constants defined here to be used from assembly code
18 * by prepending the UL suffix only with actual C code compilation.
19 */
20#ifndef __ASSEMBLY__
21#define UL(x) (x##UL)
22#else
23#define UL(x) (x)
24#endif
25
26#include <linux/compiler.h>
27#include <asm/arch/memory.h>
28#include <asm/sizes.h>
29
30#ifdef CONFIG_MMU
31
32#ifndef TASK_SIZE
33/*
34 * TASK_SIZE - the maximum size of a user space task.
35 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
36 */
37#define TASK_SIZE		UL(0xbf000000)
38#define TASK_UNMAPPED_BASE	UL(0x40000000)
39#endif
40
41/*
42 * The maximum size of a 26-bit user space task.
43 */
44#define TASK_SIZE_26		UL(0x04000000)
45
46/*
47 * Page offset: 3GB
48 */
49#ifndef PAGE_OFFSET
50#define PAGE_OFFSET		UL(0xc0000000)
51#endif
52
53/*
54 * The module space lives between the addresses given by TASK_SIZE
55 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
56 */
57#define MODULE_END		(PAGE_OFFSET)
58#define MODULE_START		(MODULE_END - 16*1048576)
59
60#if TASK_SIZE > MODULE_START
61#error Top of user space clashes with start of module space
62#endif
63
64/*
65 * The XIP kernel gets mapped at the bottom of the module vm area.
66 * Since we use sections to map it, this macro replaces the physical address
67 * with its virtual address while keeping offset from the base section.
68 */
69#define XIP_VIRT_ADDR(physaddr)  (MODULE_START + ((physaddr) & 0x000fffff))
70
71/*
72 * Allow 16MB-aligned ioremap pages
73 */
74#define IOREMAP_MAX_ORDER	24
75
76#else /* CONFIG_MMU */
77
78/*
79 * The limitation of user task size can grow up to the end of free ram region.
80 * It is difficult to define and perhaps will never meet the original meaning
81 * of this define that was meant to.
82 * Fortunately, there is no reference for this in noMMU mode, for now.
83 */
84#ifndef TASK_SIZE
85#define TASK_SIZE		(CONFIG_DRAM_SIZE)
86#endif
87
88#ifndef TASK_UNMAPPED_BASE
89#define TASK_UNMAPPED_BASE	UL(0x00000000)
90#endif
91
92#ifndef PHYS_OFFSET
93#define PHYS_OFFSET 		(CONFIG_DRAM_BASE)
94#endif
95
96#ifndef END_MEM
97#define END_MEM     		(CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
98#endif
99
100#ifndef PAGE_OFFSET
101#define PAGE_OFFSET		(PHYS_OFFSET)
102#endif
103
104/*
105 * The module can be at any place in ram in nommu mode.
106 */
107#define MODULE_END		(END_MEM)
108#define MODULE_START		(PHYS_OFFSET)
109
110#endif /* !CONFIG_MMU */
111
112/*
113 * Size of DMA-consistent memory region.  Must be multiple of 2M,
114 * between 2MB and 14MB inclusive.
115 */
116#ifndef CONSISTENT_DMA_SIZE
117#define CONSISTENT_DMA_SIZE SZ_2M
118#endif
119
120/*
121 * Physical vs virtual RAM address space conversion.  These are
122 * private definitions which should NOT be used outside memory.h
123 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
124 */
125#ifndef __virt_to_phys
126#define __virt_to_phys(x)	((x) - PAGE_OFFSET + PHYS_OFFSET)
127#define __phys_to_virt(x)	((x) - PHYS_OFFSET + PAGE_OFFSET)
128#endif
129
130/*
131 * Convert a physical address to a Page Frame Number and back
132 */
133#define	__phys_to_pfn(paddr)	((paddr) >> PAGE_SHIFT)
134#define	__pfn_to_phys(pfn)	((pfn) << PAGE_SHIFT)
135
136#ifndef __ASSEMBLY__
137
138/*
139 * The DMA mask corresponding to the maximum bus address allocatable
140 * using GFP_DMA.  The default here places no restriction on DMA
141 * allocations.  This must be the smallest DMA mask in the system,
142 * so a successful GFP_DMA allocation will always satisfy this.
143 */
144#ifndef ISA_DMA_THRESHOLD
145#define ISA_DMA_THRESHOLD	(0xffffffffULL)
146#endif
147
148#ifndef arch_adjust_zones
149#define arch_adjust_zones(node,size,holes) do { } while (0)
150#endif
151
152/*
153 * PFNs are used to describe any physical page; this means
154 * PFN 0 == physical address 0.
155 *
156 * This is the PFN of the first RAM page in the kernel
157 * direct-mapped view.  We assume this is the first page
158 * of RAM in the mem_map as well.
159 */
160#define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)
161
162/*
163 * These are *only* valid on the kernel direct mapped RAM memory.
164 * Note: Drivers should NOT use these.  They are the wrong
165 * translation for translating DMA addresses.  Use the driver
166 * DMA support - see dma-mapping.h.
167 */
168static inline unsigned long virt_to_phys(void *x)
169{
170	return __virt_to_phys((unsigned long)(x));
171}
172
173static inline void *phys_to_virt(unsigned long x)
174{
175	return (void *)(__phys_to_virt((unsigned long)(x)));
176}
177
178/*
179 * Drivers should NOT use these either.
180 */
181#define __pa(x)			__virt_to_phys((unsigned long)(x))
182#define __va(x)			((void *)__phys_to_virt((unsigned long)(x)))
183#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
184
185/*
186 * Virtual <-> DMA view memory address translations
187 * Again, these are *only* valid on the kernel direct mapped RAM
188 * memory.  Use of these is *deprecated* (and that doesn't mean
189 * use the __ prefixed forms instead.)  See dma-mapping.h.
190 */
191static inline __deprecated unsigned long virt_to_bus(void *x)
192{
193	return __virt_to_bus((unsigned long)x);
194}
195
196static inline __deprecated void *bus_to_virt(unsigned long x)
197{
198	return (void *)__bus_to_virt(x);
199}
200
201/*
202 * Conversion between a struct page and a physical address.
203 *
204 * Note: when converting an unknown physical address to a
205 * struct page, the resulting pointer must be validated
206 * using VALID_PAGE().  It must return an invalid struct page
207 * for any physical address not corresponding to a system
208 * RAM address.
209 *
210 *  page_to_pfn(page)	convert a struct page * to a PFN number
211 *  pfn_to_page(pfn)	convert a _valid_ PFN number to struct page *
212 *  pfn_valid(pfn)	indicates whether a PFN number is valid
213 *
214 *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
215 *  virt_addr_valid(k)	indicates whether a virtual address is valid
216 */
217#ifndef CONFIG_DISCONTIGMEM
218#define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET
219#define pfn_valid(pfn)		((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
220
221#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
222#define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
223
224#define PHYS_TO_NID(addr)	(0)
225
226#else /* CONFIG_DISCONTIGMEM */
227
228/*
229 * This is more complex.  We have a set of mem_map arrays spread
230 * around in memory.
231 */
232#include <linux/numa.h>
233#define arch_pfn_to_nid(pfn)	PFN_TO_NID(pfn)
234#define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
235
236#define pfn_valid(pfn)						\
237	({							\
238		unsigned int nid = PFN_TO_NID(pfn);		\
239		int valid = nid < MAX_NUMNODES;			\
240		if (valid) {					\
241			pg_data_t *node = NODE_DATA(nid);	\
242			valid = (pfn - node->node_start_pfn) <	\
243				node->node_spanned_pages;	\
244		}						\
245		valid;						\
246	})
247
248#define virt_to_page(kaddr)					\
249	(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
250
251#define virt_addr_valid(kaddr)	(KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
252
253/*
254 * Common discontigmem stuff.
255 *  PHYS_TO_NID is used by the ARM kernel/setup.c
256 */
257#define PHYS_TO_NID(addr)	PFN_TO_NID((addr) >> PAGE_SHIFT)
258
259#endif /* !CONFIG_DISCONTIGMEM */
260
261/*
262 * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.
263 */
264#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
265
266/*
267 * Optional device DMA address remapping. Do _not_ use directly!
268 * We should really eliminate virt_to_bus() here - it's deprecated.
269 */
270#ifndef __arch_page_to_dma
271#define page_to_dma(dev, page)		((dma_addr_t)__virt_to_bus((unsigned long)page_address(page)))
272#define dma_to_virt(dev, addr)		((void *)__bus_to_virt(addr))
273#define virt_to_dma(dev, addr)		((dma_addr_t)__virt_to_bus((unsigned long)(addr)))
274#else
275#define page_to_dma(dev, page)		(__arch_page_to_dma(dev, page))
276#define dma_to_virt(dev, addr)		(__arch_dma_to_virt(dev, addr))
277#define virt_to_dma(dev, addr)		(__arch_virt_to_dma(dev, addr))
278#endif
279
280/*
281 * Optional coherency support.  Currently used only by selected
282 * Intel XSC3-based systems.
283 */
284#ifndef arch_is_coherent
285#define arch_is_coherent()		0
286#endif
287
288#endif
289
290#include <asm-generic/memory_model.h>
291
292#endif
293