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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 void (*xor_syndrome)(int, int, int, size_t, void **);
76 int (*valid)(void);
77 const char *name;
78 int prefer;
79};
80
81
82extern struct raid6_calls raid6_call;
83
84
85extern const struct raid6_calls raid6_intx1;
86extern const struct raid6_calls raid6_intx2;
87extern const struct raid6_calls raid6_intx4;
88extern const struct raid6_calls raid6_intx8;
89extern const struct raid6_calls raid6_intx16;
90extern const struct raid6_calls raid6_intx32;
91extern const struct raid6_calls raid6_mmxx1;
92extern const struct raid6_calls raid6_mmxx2;
93extern const struct raid6_calls raid6_sse1x1;
94extern const struct raid6_calls raid6_sse1x2;
95extern const struct raid6_calls raid6_sse2x1;
96extern const struct raid6_calls raid6_sse2x2;
97extern const struct raid6_calls raid6_sse2x4;
98extern const struct raid6_calls raid6_altivec1;
99extern const struct raid6_calls raid6_altivec2;
100extern const struct raid6_calls raid6_altivec4;
101extern const struct raid6_calls raid6_altivec8;
102extern const struct raid6_calls raid6_avx2x1;
103extern const struct raid6_calls raid6_avx2x2;
104extern const struct raid6_calls raid6_avx2x4;
105extern const struct raid6_calls raid6_tilegx8;
106
107struct raid6_recov_calls {
108 void (*data2)(int, size_t, int, int, void **);
109 void (*datap)(int, size_t, int, void **);
110 int (*valid)(void);
111 const char *name;
112 int priority;
113};
114
115extern const struct raid6_recov_calls raid6_recov_intx1;
116extern const struct raid6_recov_calls raid6_recov_ssse3;
117extern const struct raid6_recov_calls raid6_recov_avx2;
118
119extern const struct raid6_calls raid6_neonx1;
120extern const struct raid6_calls raid6_neonx2;
121extern const struct raid6_calls raid6_neonx4;
122extern const struct raid6_calls raid6_neonx8;
123
124
125extern const struct raid6_calls * const raid6_algos[];
126extern const struct raid6_recov_calls *const raid6_recov_algos[];
127int raid6_select_algo(void);
128
129
130#define RAID6_OK 0
131#define RAID6_P_BAD 1
132#define RAID6_Q_BAD 2
133#define RAID6_PQ_BAD 3
134
135
136extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
137extern const u8 raid6_vgfmul[256][32] __attribute__((aligned(256)));
138extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
139extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
140extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
141
142
143extern void (*raid6_2data_recov)(int disks, size_t bytes, int faila, int failb,
144 void **ptrs);
145extern void (*raid6_datap_recov)(int disks, size_t bytes, int faila,
146 void **ptrs);
147void raid6_dual_recov(int disks, size_t bytes, int faila, int failb,
148 void **ptrs);
149
150
151#ifndef __KERNEL__
152
153# define jiffies raid6_jiffies()
154# define printk printf
155# define pr_err(format, ...) fprintf(stderr, format, ## __VA_ARGS__)
156# define pr_info(format, ...) fprintf(stdout, format, ## __VA_ARGS__)
157# define GFP_KERNEL 0
158# define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \
159 PROT_READ|PROT_WRITE, \
160 MAP_PRIVATE|MAP_ANONYMOUS,\
161 0, 0))
162# define free_pages(x, y) munmap((void *)(x), PAGE_SIZE << (y))
163
164static inline void cpu_relax(void)
165{
166
167}
168
169#undef HZ
170#define HZ 1000
171static inline uint32_t raid6_jiffies(void)
172{
173 struct timeval tv;
174 gettimeofday(&tv, NULL);
175 return tv.tv_sec*1000 + tv.tv_usec/1000;
176}
177
178#endif
179
180#endif
181