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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 * Bostom 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 /* Additional compute_parity mode -- updates the parity w/o LOCKING */
23 #define UPDATE_PARITY 4
25 /* We need a pre-zeroed page... if we don't want to use the kernel-provided
27 #if RAID6_USE_EMPTY_ZERO_PAGE
28 # define raid6_empty_zero_page empty_zero_page
30 extern const char raid6_empty_zero_page
[PAGE_SIZE
];
33 #else /* ! __KERNEL__ */
34 /* Used for testing in user space */
41 #include <sys/types.h>
43 /* Not standard, but glibc defines it */
44 #define BITS_PER_LONG __WORDSIZE
52 # define PAGE_SIZE 4096
54 extern const char raid6_empty_zero_page
[PAGE_SIZE
];
58 #define __attribute_const__ __attribute__((const))
59 #define noinline __attribute__((noinline))
61 #define preempt_enable()
62 #define preempt_disable()
63 #define cpu_has_feature(x) 1
64 #define enable_kernel_altivec()
65 #define disable_kernel_altivec()
67 #endif /* __KERNEL__ */
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 */
77 /* Selected algorithm */
78 extern struct raid6_calls raid6_call
;
81 extern const struct raid6_calls
* const raid6_algos
[];
82 int raid6_select_algo(void);
84 /* Return values from chk_syndrome */
88 #define RAID6_PQ_BAD 3
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)));
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
);
101 /* Some definitions to allow code to be compiled for testing in userspace */
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)
110 static inline void cpu_relax(void)
117 static inline uint32_t raid6_jiffies(void)
120 gettimeofday(&tv
, NULL
);
121 return tv
.tv_sec
*1000 + tv
.tv_usec
/1000;
124 #endif /* ! __KERNEL__ */
126 #endif /* LINUX_RAID_RAID6_H */