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1da177e4 LT |
1 | /* |
2 | * linux/include/asm-arm26/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 | /* | |
16 | * User space: 26MB | |
17 | */ | |
18 | #define TASK_SIZE (0x01a00000UL) | |
19 | ||
20 | /* | |
21 | * This decides where the kernel will search for a free chunk of vm | |
22 | * space during mmap's. | |
23 | */ | |
24 | #define TASK_UNMAPPED_BASE (TASK_SIZE / 3) | |
25 | ||
26 | /* | |
27 | * Page offset: 32MB | |
28 | */ | |
29 | #define PAGE_OFFSET (0x02000000UL) | |
30 | #define PHYS_OFFSET (0x02000000UL) | |
31 | ||
32 | #define PHYS_TO_NID(addr) (0) | |
33 | ||
34 | /* | |
35 | * PFNs are used to describe any physical page; this means | |
36 | * PFN 0 == physical address 0. | |
37 | * | |
38 | * This is the PFN of the first RAM page in the kernel | |
39 | * direct-mapped view. We assume this is the first page | |
40 | * of RAM in the mem_map as well. | |
41 | */ | |
42 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
43 | ||
44 | /* | |
45 | * These are *only* valid on the kernel direct mapped RAM memory. | |
46 | */ | |
47 | static inline unsigned long virt_to_phys(void *x) | |
48 | { | |
49 | return (unsigned long)x; | |
50 | } | |
51 | ||
52 | static inline void *phys_to_virt(unsigned long x) | |
53 | { | |
54 | return (void *)((unsigned long)x); | |
55 | } | |
56 | ||
57 | #define __pa(x) (unsigned long)(x) | |
58 | #define __va(x) ((void *)(unsigned long)(x)) | |
59 | ||
60 | /* | |
61 | * Virtual <-> DMA view memory address translations | |
62 | * Again, these are *only* valid on the kernel direct mapped RAM | |
63 | * memory. Use of these is *depreciated*. | |
64 | */ | |
65 | #define virt_to_bus(x) ((unsigned long)(x)) | |
66 | #define bus_to_virt(x) ((void *)((unsigned long)(x))) | |
67 | ||
68 | /* | |
69 | * Conversion between a struct page and a physical address. | |
70 | * | |
71 | * Note: when converting an unknown physical address to a | |
72 | * struct page, the resulting pointer must be validated | |
73 | * using VALID_PAGE(). It must return an invalid struct page | |
74 | * for any physical address not corresponding to a system | |
75 | * RAM address. | |
76 | * | |
77 | * page_to_pfn(page) convert a struct page * to a PFN number | |
78 | * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * | |
79 | * pfn_valid(pfn) indicates whether a PFN number is valid | |
80 | * | |
81 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
82 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
83 | */ | |
89fccaf2 | 84 | #define ARCH_PFN_OFFSET (PHYS_PFN_OFFSET) |
1da177e4 LT |
85 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) |
86 | ||
87 | #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) | |
88 | #define virt_addr_valid(kaddr) ((int)(kaddr) >= PAGE_OFFSET && (int)(kaddr) < (unsigned long)high_memory) | |
89 | ||
90 | /* | |
91 | * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. | |
92 | */ | |
93 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
94 | ||
95 | /* | |
96 | * We should really eliminate virt_to_bus() here - it's depreciated. | |
97 | */ | |
98 | #define page_to_bus(page) (page_address(page)) | |
99 | ||
89fccaf2 | 100 | #include <asm-generic/memory_model.h> |
1da177e4 | 101 | #endif |