/* -*- linux-c -*- ------------------------------------------------------- * * *   Copyright 2003 H. Peter Anvin - All Rights Reserved * *   This program is free software; you can redistribute it and/or modify *   it under the terms of the GNU General Public License as published by *   the Free Software Foundation, Inc., 53 Temple Place Ste 330, *   Bostom MA 02111-1307, USA; either version 2 of the License, or *   (at your option) any later version; incorporated herein by reference. * * ----------------------------------------------------------------------- */ #ifndef LINUX_RAID_RAID6_H#define LINUX_RAID_RAID6_H #ifdef __KERNEL__ /* Set to 1 to use kernel-wide empty_zero_page */#define RAID6_USE_EMPTY_ZERO_PAGE 0 #include <linux/module.h>#include <linux/stddef.h>#include <linux/compiler.h>#include <linux/types.h>#include <linux/kernel.h>#include <linux/errno.h>#include <linux/mempool.h>#include <linux/list.h>#include <linux/vmalloc.h>#include <linux/raid/md.h>#include <linux/raid/raid5.h> typedef raid5_conf_t raid6_conf_t; /* Same configuration */ /* Additional compute_parity mode -- updates the parity w/o LOCKING */#define UPDATE_PARITY	4 /* We need a pre-zeroed page... if we don't want to use the kernel-provided   one define it here */#if RAID6_USE_EMPTY_ZERO_PAGE# define raid6_empty_zero_page empty_zero_page#elseextern const char raid6_empty_zero_page[PAGE_SIZE];#endif #else /* ! __KERNEL__ *//* Used for testing in user space */ #include <errno.h>#include <inttypes.h>#include <limits.h>#include <stddef.h>#include <sys/mman.h>#include <sys/types.h> /* Not standard, but glibc defines it */#define BITS_PER_LONG __WORDSIZE typedef uint8_t  u8;typedef uint16_t u16;typedef uint32_t u32;typedef uint64_t u64; #ifndef PAGE_SIZE# define PAGE_SIZE 4096#endifextern const char raid6_empty_zero_page[PAGE_SIZE]; #define __init#define __exit#define __attribute_const__ __attribute__((const))#define noinline __attribute__((noinline)) #define preempt_enable()#define preempt_disable()#define cpu_has_feature(x) 1#define enable_kernel_altivec()#define disable_kernel_altivec() #endif /* __KERNEL__ */ /* Routine choices */struct raid6_calls {	void (*gen_syndrome)(int, size_t, void **);	int  (*valid)(void);	/* Returns 1 if this routine set is usable */	const char *name;	/* Name of this routine set */	int prefer;		/* Has special performance attribute */}; /* Selected algorithm */extern struct raid6_calls raid6_call; /* Algorithm list */extern const struct raid6_calls * const raid6_algos[];int raid6_select_algo(void); /* Return values from chk_syndrome */#define RAID6_OK	0#define RAID6_P_BAD	1#define RAID6_Q_BAD	2#define RAID6_PQ_BAD	3 /* Galois field tables */extern const u8 raid6_gfmul[256][256] __attribute__((aligned(256)));extern const u8 raid6_gfexp[256]      __attribute__((aligned(256)));extern const u8 raid6_gfinv[256]      __attribute__((aligned(256)));extern const u8 raid6_gfexi[256]      __attribute__((aligned(256))); /* Recovery routines */void raid6_2data_recov(int disks, size_t bytes, int faila, int failb, void **ptrs);void raid6_datap_recov(int disks, size_t bytes, int faila, void **ptrs);void raid6_dual_recov(int disks, size_t bytes, int faila, int failb, void **ptrs); /* Some definitions to allow code to be compiled for testing in userspace */#ifndef __KERNEL__ # define jiffies	raid6_jiffies()# define printk 	printf# define GFP_KERNEL	0# define __get_free_pages(x,y)	((unsigned long)mmap(NULL, PAGE_SIZE << (y), PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0))# define free_pages(x,y)	munmap((void *)(x), (y)*PAGE_SIZE) static inline void cpu_relax(void){	/* Nothing */} #undef  HZ#define HZ 1000static inline uint32_t raid6_jiffies(void){	struct timeval tv;	gettimeofday(&tv, NULL);	return tv.tv_sec*1000 + tv.tv_usec/1000;} #endif /* ! __KERNEL__ */ #endif /* LINUX_RAID_RAID6_H */