1 /* -*- linux-c -*- ------------------------------------------------------- *
3 * Copyright 2003 H. Peter Anvin - All Rights Reserved
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.
11 * ----------------------------------------------------------------------- */
13 #ifndef LINUX_RAID_RAID6_H
14 #define LINUX_RAID_RAID6_H
18 /* Set to 1 to use kernel-wide empty_zero_page */
19 #define RAID6_USE_EMPTY_ZERO_PAGE 0
20 #include <linux/blkdev.h>
22 /* We need a pre-zeroed page... if we don't want to use the kernel-provided
24 #if RAID6_USE_EMPTY_ZERO_PAGE
25 # define raid6_empty_zero_page empty_zero_page
27 extern const char raid6_empty_zero_page
[PAGE_SIZE
];
30 #else /* ! __KERNEL__ */
31 /* Used for testing in user space */
38 #include <sys/types.h>
40 /* Not standard, but glibc defines it */
41 #define BITS_PER_LONG __WORDSIZE
49 # define PAGE_SIZE 4096
51 extern const char raid6_empty_zero_page
[PAGE_SIZE
];
55 #define __attribute_const__ __attribute__((const))
56 #define noinline __attribute__((noinline))
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()
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 /* __KERNEL__ */
74 void (*gen_syndrome
)(int, size_t, void **);
75 int (*valid
)(void); /* Returns 1 if this routine set is usable */
76 const char *name
; /* Name of this routine set */
77 int prefer
; /* Has special performance attribute */
80 /* Selected algorithm */
81 extern struct raid6_calls raid6_call
;
83 /* Various routine sets */
84 extern const struct raid6_calls raid6_intx1
;
85 extern const struct raid6_calls raid6_intx2
;
86 extern const struct raid6_calls raid6_intx4
;
87 extern const struct raid6_calls raid6_intx8
;
88 extern const struct raid6_calls raid6_intx16
;
89 extern const struct raid6_calls raid6_intx32
;
90 extern const struct raid6_calls raid6_mmxx1
;
91 extern const struct raid6_calls raid6_mmxx2
;
92 extern const struct raid6_calls raid6_sse1x1
;
93 extern const struct raid6_calls raid6_sse1x2
;
94 extern const struct raid6_calls raid6_sse2x1
;
95 extern const struct raid6_calls raid6_sse2x2
;
96 extern const struct raid6_calls raid6_sse2x4
;
97 extern const struct raid6_calls raid6_altivec1
;
98 extern const struct raid6_calls raid6_altivec2
;
99 extern const struct raid6_calls raid6_altivec4
;
100 extern const struct raid6_calls raid6_altivec8
;
103 extern const struct raid6_calls
* const raid6_algos
[];
104 int raid6_select_algo(void);
106 /* Return values from chk_syndrome */
108 #define RAID6_P_BAD 1
109 #define RAID6_Q_BAD 2
110 #define RAID6_PQ_BAD 3
112 /* Galois field tables */
113 extern const u8 raid6_gfmul
[256][256] __attribute__((aligned(256)));
114 extern const u8 raid6_gfexp
[256] __attribute__((aligned(256)));
115 extern const u8 raid6_gfinv
[256] __attribute__((aligned(256)));
116 extern const u8 raid6_gfexi
[256] __attribute__((aligned(256)));
118 /* Recovery routines */
119 void raid6_2data_recov(int disks
, size_t bytes
, int faila
, int failb
,
121 void raid6_datap_recov(int disks
, size_t bytes
, int faila
, void **ptrs
);
122 void raid6_dual_recov(int disks
, size_t bytes
, int faila
, int failb
,
125 /* Some definitions to allow code to be compiled for testing in userspace */
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,\
135 # define free_pages(x, y) munmap((void *)(x), (y)*PAGE_SIZE)
137 static inline void cpu_relax(void)
144 static inline uint32_t raid6_jiffies(void)
147 gettimeofday(&tv
, NULL
);
148 return tv
.tv_sec
*1000 + tv
.tv_usec
/1000;
151 #endif /* ! __KERNEL__ */
153 #endif /* LINUX_RAID_RAID6_H */