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1 | /* |
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 | */ | |
33 | static inline unsigned long virt_to_phys(void *x) | |
34 | { | |
35 | return __virt_to_phys((unsigned long)(x)); | |
36 | } | |
37 | ||
38 | static 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 */ |