blob: c3b2afd907761ddf73805f06cb783be319728830 [file] [log] [blame]
wdenkb783eda2003-06-25 22:26:29 +00001/*
2 * linux/include/asm-arm/memory.h
3 *
4 * Copyright (C) 2000-2002 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Note: this file should not be included by non-asm/.h files
11 */
12#ifndef __ASM_ARM_MEMORY_H
13#define __ASM_ARM_MEMORY_H
14
15#if 0 /* XXX###XXX */
16
17#include <linux/config.h>
18#include <asm/arch/memory.h>
19
20/*
21 * PFNs are used to describe any physical page; this means
22 * PFN 0 == physical address 0.
23 *
24 * This is the PFN of the first RAM page in the kernel
25 * direct-mapped view. We assume this is the first page
26 * of RAM in the mem_map as well.
27 */
28#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
29
30/*
31 * These are *only* valid on the kernel direct mapped RAM memory.
32 */
33static inline unsigned long virt_to_phys(void *x)
34{
35 return __virt_to_phys((unsigned long)(x));
36}
37
38static inline void *phys_to_virt(unsigned long x)
39{
40 return (void *)(__phys_to_virt((unsigned long)(x)));
41}
42
43#define __pa(x) __virt_to_phys((unsigned long)(x))
44#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
45
46/*
47 * Virtual <-> DMA view memory address translations
48 * Again, these are *only* valid on the kernel direct mapped RAM
49 * memory. Use of these is *depreciated*.
50 */
51#define virt_to_bus(x) (__virt_to_bus((unsigned long)(x)))
52#define bus_to_virt(x) ((void *)(__bus_to_virt((unsigned long)(x))))
53
54/*
55 * Conversion between a struct page and a physical address.
56 *
57 * Note: when converting an unknown physical address to a
58 * struct page, the resulting pointer must be validated
59 * using VALID_PAGE(). It must return an invalid struct page
60 * for any physical address not corresponding to a system
61 * RAM address.
62 *
63 * page_to_pfn(page) convert a struct page * to a PFN number
64 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
65 * pfn_valid(pfn) indicates whether a PFN number is valid
66 *
67 * virt_to_page(k) convert a _valid_ virtual address to struct page *
68 * virt_addr_valid(k) indicates whether a virtual address is valid
69 */
70#ifndef CONFIG_DISCONTIGMEM
71
72#define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET)
73#define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
74#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
75
76#define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
77#define virt_addr_valid(kaddr) ((kaddr) >= PAGE_OFFSET && (kaddr) < (unsigned long)high_memory)
78
79#define PHYS_TO_NID(addr) (0)
80
81#define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
82
83#else
84
85/*
86 * This is more complex. We have a set of mem_map arrays spread
87 * around in memory.
88 */
89#define page_to_pfn(page) \
90 (((page) - page_zone(page)->zone_mem_map) \
91 + (page_zone(page)->zone_start_paddr >> PAGE_SHIFT))
92
93#define pfn_to_page(pfn) \
94 (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))
95
96#define pfn_valid(pfn) \
97 ({ \
98 unsigned int node = PFN_TO_NID(pfn); \
99 struct pglist_data *nd = NODE_DATA(node); \
100 ((node < NR_NODES) && \
101 ((pfn - (nd->node_start_paddr >> PAGE_SHIFT)) < nd->node_size));\
102 })
103
104#define virt_to_page(kaddr) \
105 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
106
107#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < NR_NODES)
108
109/*
110 * Common discontigmem stuff.
111 * PHYS_TO_NID is used by the ARM kernel/setup.c
112 */
113#define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
114
115/*
116 * 2.4 compatibility
117 *
118 * VALID_PAGE returns a non-zero value if given page pointer is valid.
119 * This assumes all node's mem_maps are stored within the node they
120 * refer to. This is actually inherently buggy.
121 */
122#define VALID_PAGE(page) \
123({ unsigned int node = KVADDR_TO_NID(page); \
124 ((node < NR_NODES) && \
125 ((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size)); \
126})
127
128#endif
129
130/*
131 * We should really eliminate virt_to_bus() here - it's depreciated.
132 */
133#define page_to_bus(page) (virt_to_bus(page_address(page)))
134
135#endif /* XXX###XXX */
136
137#endif /* __ASM_ARM_MEMORY_H */