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 27 extern 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 43 typedef uint8_t u8; 44 typedef uint16_t u16; 45 typedef uint32_t u32; 46 typedef uint64_t u64; 47 48 #ifndef PAGE_SIZE 49 # define PAGE_SIZE 4096 50 #endif 51 extern 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 */ 71 struct 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 */ 79 extern struct raid6_calls raid6_call; 80 81 /* Various routine sets */ 82 extern const struct raid6_calls raid6_intx1; 83 extern const struct raid6_calls raid6_intx2; 84 extern const struct raid6_calls raid6_intx4; 85 extern const struct raid6_calls raid6_intx8; 86 extern const struct raid6_calls raid6_intx16; 87 extern const struct raid6_calls raid6_intx32; 88 extern const struct raid6_calls raid6_mmxx1; 89 extern const struct raid6_calls raid6_mmxx2; 90 extern const struct raid6_calls raid6_sse1x1; 91 extern const struct raid6_calls raid6_sse1x2; 92 extern const struct raid6_calls raid6_sse2x1; 93 extern const struct raid6_calls raid6_sse2x2; 94 extern const struct raid6_calls raid6_sse2x4; 95 extern const struct raid6_calls raid6_altivec1; 96 extern const struct raid6_calls raid6_altivec2; 97 extern const struct raid6_calls raid6_altivec4; 98 extern const struct raid6_calls raid6_altivec8; 99 100 /* Algorithm list */ 101 extern const struct raid6_calls * const raid6_algos[]; 102 int raid6_select_algo(void); 103 104 /* Return values from chk_syndrome */ 105 #define RAID6_OK 0 106 #define RAID6_P_BAD 1 107 #define RAID6_Q_BAD 2 108 #define RAID6_PQ_BAD 3 109 110 /* Galois field tables */ 111 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); 112 extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); 113 extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); 114 extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); 115 116 /* Recovery routines */ 117 void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, 118 void **ptrs); 119 void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs); 120 void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, 121 void **ptrs); 122 123 /* Some definitions to allow code to be compiled for testing in userspace */ 124 #ifndef __KERNEL__ 125 126 # define jiffies raid6_jiffies() 127 # define printk printf 128 # define GFP_KERNEL 0 129 # define __get_free_pages(x, y) ((unsigned long)mmap(NULL, PAGE_SIZE << (y), \ 130 PROT_READ|PROT_WRITE, \ 131 MAP_PRIVATE|MAP_ANONYMOUS,\ 132 0, 0)) 133 # define free_pages(x, y) munmap((void *)(x), (y)*PAGE_SIZE) 134 135 static inline void cpu_relax(void) 136 { 137 /* Nothing */ 138 } 139 140 #undef HZ 141 #define HZ 1000 142 static inline uint32_t raid6_jiffies(void) 143 { 144 struct timeval tv; 145 gettimeofday(&tv, NULL); 146 return tv.tv_sec*1000 + tv.tv_usec/1000; 147 } 148 149 #endif /* ! __KERNEL__ */ 150 151 #endif /* LINUX_RAID_RAID6_H */ 152