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1 | /* -*- linux-c -*- ------------------------------------------------------- * |
2 | * | |
3 | * Copyright 2003 H. Peter Anvin - All Rights Reserved | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation, Inc., 53 Temple Place Ste 330, | |
93ed05e2 | 8 | * Boston MA 02111-1307, USA; either version 2 of the License, or |
1da177e4 LT |
9 | * (at your option) any later version; incorporated herein by reference. |
10 | * | |
11 | * ----------------------------------------------------------------------- */ | |
12 | ||
13 | #ifndef LINUX_RAID_RAID6_H | |
14 | #define LINUX_RAID_RAID6_H | |
15 | ||
16 | #ifdef __KERNEL__ | |
17 | ||
18 | /* Set to 1 to use kernel-wide empty_zero_page */ | |
19 | #define RAID6_USE_EMPTY_ZERO_PAGE 0 | |
bff61975 | 20 | #include <linux/blkdev.h> |
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21 | |
22 | /* Additional compute_parity mode -- updates the parity w/o LOCKING */ | |
23 | #define UPDATE_PARITY 4 | |
24 | ||
25 | /* We need a pre-zeroed page... if we don't want to use the kernel-provided | |
26 | one define it here */ | |
27 | #if RAID6_USE_EMPTY_ZERO_PAGE | |
28 | # define raid6_empty_zero_page empty_zero_page | |
29 | #else | |
30 | extern const char raid6_empty_zero_page[PAGE_SIZE]; | |
31 | #endif | |
32 | ||
33 | #else /* ! __KERNEL__ */ | |
34 | /* Used for testing in user space */ | |
35 | ||
36 | #include <errno.h> | |
37 | #include <inttypes.h> | |
38 | #include <limits.h> | |
39 | #include <stddef.h> | |
40 | #include <sys/mman.h> | |
41 | #include <sys/types.h> | |
42 | ||
43 | /* Not standard, but glibc defines it */ | |
44 | #define BITS_PER_LONG __WORDSIZE | |
45 | ||
46 | typedef uint8_t u8; | |
47 | typedef uint16_t u16; | |
48 | typedef uint32_t u32; | |
49 | typedef uint64_t u64; | |
50 | ||
51 | #ifndef PAGE_SIZE | |
52 | # define PAGE_SIZE 4096 | |
53 | #endif | |
54 | extern const char raid6_empty_zero_page[PAGE_SIZE]; | |
55 | ||
56 | #define __init | |
57 | #define __exit | |
58 | #define __attribute_const__ __attribute__((const)) | |
d7e70ba4 | 59 | #define noinline __attribute__((noinline)) |
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60 | |
61 | #define preempt_enable() | |
62 | #define preempt_disable() | |
d7e70ba4 PA |
63 | #define cpu_has_feature(x) 1 |
64 | #define enable_kernel_altivec() | |
65 | #define disable_kernel_altivec() | |
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66 | |
67 | #endif /* __KERNEL__ */ | |
68 | ||
69 | /* Routine choices */ | |
70 | struct raid6_calls { | |
71 | void (*gen_syndrome)(int, size_t, void **); | |
72 | int (*valid)(void); /* Returns 1 if this routine set is usable */ | |
73 | const char *name; /* Name of this routine set */ | |
74 | int prefer; /* Has special performance attribute */ | |
75 | }; | |
76 | ||
77 | /* Selected algorithm */ | |
78 | extern struct raid6_calls raid6_call; | |
79 | ||
80 | /* Algorithm list */ | |
81 | extern const struct raid6_calls * const raid6_algos[]; | |
82 | int raid6_select_algo(void); | |
83 | ||
84 | /* Return values from chk_syndrome */ | |
85 | #define RAID6_OK 0 | |
86 | #define RAID6_P_BAD 1 | |
87 | #define RAID6_Q_BAD 2 | |
88 | #define RAID6_PQ_BAD 3 | |
89 | ||
90 | /* Galois field tables */ | |
91 | extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); | |
92 | extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); | |
93 | extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); | |
94 | extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); | |
95 | ||
96 | /* Recovery routines */ | |
97 | void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, void **ptrs); | |
98 | void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs); | |
99 | void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, void **ptrs); | |
100 | ||
101 | /* Some definitions to allow code to be compiled for testing in userspace */ | |
102 | #ifndef __KERNEL__ | |
103 | ||
104 | # define jiffies raid6_jiffies() | |
105 | # define printk printf | |
106 | # define GFP_KERNEL 0 | |
107 | # define __get_free_pages(x,y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0)) | |
108 | # define free_pages(x,y) munmap((void *)(x), (y)*PAGE_SIZE) | |
109 | ||
110 | static inline void cpu_relax(void) | |
111 | { | |
112 | /* Nothing */ | |
113 | } | |
114 | ||
115 | #undef HZ | |
116 | #define HZ 1000 | |
117 | static inline uint32_t raid6_jiffies(void) | |
118 | { | |
119 | struct timeval tv; | |
120 | gettimeofday(&tv, NULL); | |
121 | return tv.tv_sec*1000 + tv.tv_usec/1000; | |
122 | } | |
123 | ||
124 | #endif /* ! __KERNEL__ */ | |
125 | ||
126 | #endif /* LINUX_RAID_RAID6_H */ |