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1da177e4 LT |
1 | #ifndef _ABS_ADDR_H |
2 | #define _ABS_ADDR_H | |
3 | ||
4 | #include <linux/config.h> | |
5 | ||
6 | /* | |
7 | * c 2001 PPC 64 Team, IBM Corp | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <asm/types.h> | |
16 | #include <asm/page.h> | |
17 | #include <asm/prom.h> | |
18 | #include <asm/lmb.h> | |
19 | ||
20 | typedef u32 msChunks_entry; | |
21 | struct msChunks { | |
22 | unsigned long num_chunks; | |
23 | unsigned long chunk_size; | |
24 | unsigned long chunk_shift; | |
25 | unsigned long chunk_mask; | |
26 | msChunks_entry *abs; | |
27 | }; | |
28 | ||
29 | extern struct msChunks msChunks; | |
30 | ||
31 | extern unsigned long msChunks_alloc(unsigned long, unsigned long, unsigned long); | |
32 | extern unsigned long reloc_offset(void); | |
33 | ||
34 | #ifdef CONFIG_MSCHUNKS | |
35 | ||
36 | static inline unsigned long | |
37 | chunk_to_addr(unsigned long chunk) | |
38 | { | |
39 | unsigned long offset = reloc_offset(); | |
40 | struct msChunks *_msChunks = PTRRELOC(&msChunks); | |
41 | ||
42 | return chunk << _msChunks->chunk_shift; | |
43 | } | |
44 | ||
45 | static inline unsigned long | |
46 | addr_to_chunk(unsigned long addr) | |
47 | { | |
48 | unsigned long offset = reloc_offset(); | |
49 | struct msChunks *_msChunks = PTRRELOC(&msChunks); | |
50 | ||
51 | return addr >> _msChunks->chunk_shift; | |
52 | } | |
53 | ||
54 | static inline unsigned long | |
55 | chunk_offset(unsigned long addr) | |
56 | { | |
57 | unsigned long offset = reloc_offset(); | |
58 | struct msChunks *_msChunks = PTRRELOC(&msChunks); | |
59 | ||
60 | return addr & _msChunks->chunk_mask; | |
61 | } | |
62 | ||
63 | static inline unsigned long | |
64 | abs_chunk(unsigned long pchunk) | |
65 | { | |
66 | unsigned long offset = reloc_offset(); | |
67 | struct msChunks *_msChunks = PTRRELOC(&msChunks); | |
68 | if ( pchunk >= _msChunks->num_chunks ) { | |
69 | return pchunk; | |
70 | } | |
71 | return PTRRELOC(_msChunks->abs)[pchunk]; | |
72 | } | |
73 | ||
74 | /* A macro so it can take pointers or unsigned long. */ | |
75 | #define phys_to_abs(pa) \ | |
76 | ({ unsigned long _pa = (unsigned long)(pa); \ | |
77 | chunk_to_addr(abs_chunk(addr_to_chunk(_pa))) + chunk_offset(_pa); \ | |
78 | }) | |
79 | ||
80 | static inline unsigned long | |
81 | physRpn_to_absRpn(unsigned long rpn) | |
82 | { | |
83 | unsigned long pa = rpn << PAGE_SHIFT; | |
84 | unsigned long aa = phys_to_abs(pa); | |
85 | return (aa >> PAGE_SHIFT); | |
86 | } | |
87 | ||
88 | /* A macro so it can take pointers or unsigned long. */ | |
89 | #define abs_to_phys(aa) lmb_abs_to_phys((unsigned long)(aa)) | |
90 | ||
91 | #else /* !CONFIG_MSCHUNKS */ | |
92 | ||
93 | #define chunk_to_addr(chunk) ((unsigned long)(chunk)) | |
94 | #define addr_to_chunk(addr) (addr) | |
95 | #define chunk_offset(addr) (0) | |
96 | #define abs_chunk(pchunk) (pchunk) | |
97 | ||
98 | #define phys_to_abs(pa) (pa) | |
99 | #define physRpn_to_absRpn(rpn) (rpn) | |
100 | #define abs_to_phys(aa) (aa) | |
101 | ||
102 | #endif /* !CONFIG_MSCHUNKS */ | |
103 | ||
104 | /* Convenience macros */ | |
105 | #define virt_to_abs(va) phys_to_abs(__pa(va)) | |
106 | #define abs_to_virt(aa) __va(abs_to_phys(aa)) | |
107 | ||
108 | #endif /* _ABS_ADDR_H */ |