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,
8 * Boston MA 02111-1307, USA; either version 2 of the License, or
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
20 #include <linux/blkdev.h>
21
22 /* We need a pre-zeroed page... if we don't want to use the kernel-provided
23 one define it here */
24 #if RAID6_USE_EMPTY_ZERO_PAGE
25 # define raid6_empty_zero_page empty_zero_page
26 #else
27 extern const char raid6_empty_zero_page[PAGE_SIZE];
28 #endif
29
30 #else /* ! __KERNEL__ */
31 /* Used for testing in user space */
32
33 #include <errno.h>
34 #include <inttypes.h>
35 #include <limits.h>
36 #include <stddef.h>
37 #include <sys/mman.h>
38 #include <sys/types.h>
39
40 /* Not standard, but glibc defines it */
41 #define BITS_PER_LONG __WORDSIZE
42
43 typedef uint8_t u8;
44 typedef uint16_t u16;
45 typedef uint32_t u32;
46 typedef uint64_t u64;
47
48 #ifndef PAGE_SIZE
49 # define PAGE_SIZE 4096
50 #endif
51 extern const char raid6_empty_zero_page[PAGE_SIZE];
52
53 #define __init
54 #define __exit
55 #define __attribute_const__ __attribute__((const))
56 #define noinline __attribute__((noinline))
57
58 #define preempt_enable()
59 #define preempt_disable()
60 #define cpu_has_feature(x) 1
61 #define enable_kernel_altivec()
62 #define disable_kernel_altivec()
63
64 #define EXPORT_SYMBOL(sym)
65 #define MODULE_LICENSE(licence)
66 #define subsys_initcall(x)
67 #define module_exit(x)
68 #endif /* __KERNEL__ */
69
70 /* Routine choices */
71 struct raid6_calls {
72 void (*gen_syndrome)(int, size_t, void **);
73 int (*valid)(void); /* Returns 1 if this routine set is usable */
74 const char *name; /* Name of this routine set */
75 int prefer; /* Has special performance attribute */
76 };
77
78 /* Selected algorithm */
79 extern struct raid6_calls raid6_call;
80
81 /* Algorithm list */
82 extern const struct raid6_calls * const raid6_algos[];
83 int raid6_select_algo(void);
84
85 /* Return values from chk_syndrome */
86 #define RAID6_OK 0
87 #define RAID6_P_BAD 1
88 #define RAID6_Q_BAD 2
89 #define RAID6_PQ_BAD 3
90
91 /* Galois field tables */
92 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
93 extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
94 extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
95 extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
96
97 /* Recovery routines */
98 void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
99 void **ptrs);
100 void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs);
101 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
102 void **ptrs);
103
104 /* Some definitions to allow code to be compiled for testing in userspace */
105 #ifndef __KERNEL__
106
107 # define jiffies raid6_jiffies()
108 # define printk printf
109 # define GFP_KERNEL 0
110 # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
111 PROT_READ|PROT_WRITE, \
112 MAP_PRIVATE|MAP_ANONYMOUS,\
113 0, 0))
114 # define free_pages(x, y) munmap((void *)(x), (y)*PAGE_SIZE)
115
116 static inline void cpu_relax(void)
117 {
118 /* Nothing */
119 }
120
121 #undef HZ
122 #define HZ 1000
123 static inline uint32_t raid6_jiffies(void)
124 {
125 struct timeval tv;
126 gettimeofday(&tv, NULL);
127 return tv.tv_sec*1000 + tv.tv_usec/1000;
128 }
129
130 #endif /* ! __KERNEL__ */
131
132 #endif /* LINUX_RAID_RAID6_H */
133
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