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 /* Algorithm list */ 82 extern const struct raid6_calls * const raid6_algos[]; 83 int 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 */ 92 extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256))); 93 extern const u8 raid6_gfexp[256] __attribute__((aligned(256))); 94 extern const u8 raid6_gfinv[256] __attribute__((aligned(256))); 95 extern const u8 raid6_gfexi[256] __attribute__((aligned(256))); 96 97 /* Recovery routines */ 98 void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, 99 void **ptrs); 100 void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs); 101 void 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) 115 116 static inline void cpu_relax(void) 117 { 118 /* Nothing */ 119 } 120 121 #undef HZ 122 #define HZ 1000 123 static 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 */ 133