1
2
3
4
5
6
7
8
9
10
11
12
13#ifndef LINUX_RAID_RAID6_H
14#define LINUX_RAID_RAID6_H
15
16#ifdef __KERNEL__
17
18
19#define RAID6_USE_EMPTY_ZERO_PAGE 0
20#include <linux/blkdev.h>
21
22
23
24#if RAID6_USE_EMPTY_ZERO_PAGE
25# define raid6_empty_zero_page empty_zero_page
26#else
27extern const char raid6_empty_zero_page[PAGE_SIZE];
28#endif
29
30#else
31
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
41#define BITS_PER_LONG __WORDSIZE
42
43typedef uint8_t u8;
44typedef uint16_t u16;
45typedef uint32_t u32;
46typedef uint64_t u64;
47
48#ifndef PAGE_SIZE
49# define PAGE_SIZE 4096
50#endif
51extern 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 EXPORT_SYMBOL_GPL(sym)
66#define MODULE_LICENSE(licence)
67#define MODULE_DESCRIPTION(desc)
68#define subsys_initcall(x)
69#define module_exit(x)
70#endif
71
72
73struct raid6_calls {
74 void (*gen_syndrome)(int, size_t, void **);
75 int (*valid)(void);
76 const char *name;
77 int prefer;
78};
79
80
81extern struct raid6_calls raid6_call;
82
83
84extern const struct raid6_calls raid6_intx1;
85extern const struct raid6_calls raid6_intx2;
86extern const struct raid6_calls raid6_intx4;
87extern const struct raid6_calls raid6_intx8;
88extern const struct raid6_calls raid6_intx16;
89extern const struct raid6_calls raid6_intx32;
90extern const struct raid6_calls raid6_mmxx1;
91extern const struct raid6_calls raid6_mmxx2;
92extern const struct raid6_calls raid6_sse1x1;
93extern const struct raid6_calls raid6_sse1x2;
94extern const struct raid6_calls raid6_sse2x1;
95extern const struct raid6_calls raid6_sse2x2;
96extern const struct raid6_calls raid6_sse2x4;
97extern const struct raid6_calls raid6_altivec1;
98extern const struct raid6_calls raid6_altivec2;
99extern const struct raid6_calls raid6_altivec4;
100extern const struct raid6_calls raid6_altivec8;
101
102
103extern const struct raid6_calls * const raid6_algos[];
104int raid6_select_algo(void);
105
106
107#define RAID6_OK 0
108#define RAID6_P_BAD 1
109#define RAID6_Q_BAD 2
110#define RAID6_PQ_BAD 3
111
112
113extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
114extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
115extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
116extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
117
118
119void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
120 void **ptrs);
121void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs);
122void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
123 void **ptrs);
124
125
126#ifndef __KERNEL__
127
128# define jiffies raid6_jiffies()
129# define printk printf
130# define GFP_KERNEL 0
131# define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
132 PROT_READ|PROT_WRITE, \
133 MAP_PRIVATE|MAP_ANONYMOUS,\
134 0, 0))
135# define free_pages(x, y) munmap((void *)(x), (y)*PAGE_SIZE)
136
137static inline void cpu_relax(void)
138{
139
140}
141
142#undef HZ
143#define HZ 1000
144static inline uint32_t raid6_jiffies(void)
145{
146 struct timeval tv;
147 gettimeofday(&tv, NULL);
148 return tv.tv_sec*1000 + tv.tv_usec/1000;
149}
150
151#endif
152
153#endif
154