Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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
27extern 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
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 MODULE_LICENSE(licence)
66#define subsys_initcall(x)
67#define module_exit(x)
68#endif /* __KERNEL__ */
69
70/* Routine choices */
71struct 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 */
79extern struct raid6_calls raid6_call;
80
81/* Algorithm list */
82extern const struct raid6_calls * const raid6_algos[];
83int 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 */
92extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));
93extern const u8 raid6_gfexp[256] __attribute__((aligned(256)));
94extern const u8 raid6_gfinv[256] __attribute__((aligned(256)));
95extern const u8 raid6_gfexi[256] __attribute__((aligned(256)));
96
97/* Recovery routines */
98void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
99 void **ptrs);
100void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs);
101void 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
116static inline void cpu_relax(void)
117{
118 /* Nothing */
119}
120
121#undef HZ
122#define HZ 1000
123static 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 */