/* -*- linux-c -*- ------------------------------------------------------- * * *   Copyright 2002-2004 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, *   Boston MA 02111-1307, USA; either version 2 of the License, or *   (at your option) any later version; incorporated herein by reference. * * ----------------------------------------------------------------------- */ /* * raid6altivec$#.c * * $#-way unrolled portable integer math RAID-6 instruction set * * This file is postprocessed using unroll.awk * * <benh> hpa: in process, * you can just "steal" the vec unit with enable_kernel_altivec() (but * bracked this with preempt_disable/enable or in a lock) */ #include <linux/raid/pq.h> #ifdef CONFIG_ALTIVEC #include <altivec.h>#ifdef __KERNEL__# include <asm/cputable.h># include <asm/switch_to.h>#endif /* * This is the C data type to use.  We use a vector of * signed char so vec_cmpgt() will generate the right * instruction. */ typedef vector signed char unative_t; #define NBYTES(x) ((vector signed char) {x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x})#define NSIZE	sizeof(unative_t) /* * The SHLBYTE() operation shifts each byte left by 1, *not* * rolling over into the next byte */static inline __attribute_const__ unative_t SHLBYTE(unative_t v){	return vec_add(v,v);} /* * The MASK() operation returns 0xFF in any byte for which the high * bit is 1, 0x00 for any byte for which the high bit is 0. */static inline __attribute_const__ unative_t MASK(unative_t v){	unative_t zv = NBYTES(0); 	/* vec_cmpgt returns a vector bool char; thus the need for the cast */	return (unative_t)vec_cmpgt(zv, v);}  /* This is noinline to make damned sure that gcc doesn't move any of the   Altivec code around the enable/disable code */static void noinlineraid6_altivec$#_gen_syndrome_real(int disks, size_t bytes, void **ptrs){	u8 **dptr = (u8 **)ptrs;	u8 *p, *q;	int d, z, z0; 	unative_t wd$$, wq$$, wp$$, w1$$, w2$$;	unative_t x1d = NBYTES(0x1d); 	z0 = disks - 3;		/* Highest data disk */	p = dptr[z0+1];		/* XOR parity */	q = dptr[z0+2];		/* RS syndrome */ 	for ( d = 0 ; d < bytes ; d += NSIZE*$# ) {		wq$$ = wp$$ = *(unative_t *)&dptr[z0][d+$$*NSIZE];		for ( z = z0-1 ; z >= 0 ; z-- ) {			wd$$ = *(unative_t *)&dptr[z][d+$$*NSIZE];			wp$$ = vec_xor(wp$$, wd$$);			w2$$ = MASK(wq$$);			w1$$ = SHLBYTE(wq$$);			w2$$ = vec_and(w2$$, x1d);			w1$$ = vec_xor(w1$$, w2$$);			wq$$ = vec_xor(w1$$, wd$$);		}		*(unative_t *)&p[d+NSIZE*$$] = wp$$;		*(unative_t *)&q[d+NSIZE*$$] = wq$$;	}} static void raid6_altivec$#_gen_syndrome(int disks, size_t bytes, void **ptrs){	preempt_disable();	enable_kernel_altivec(); 	raid6_altivec$#_gen_syndrome_real(disks, bytes, ptrs); 	preempt_enable();} int raid6_have_altivec(void);#if $# == 1int raid6_have_altivec(void){	/* This assumes either all CPUs have Altivec or none does */# ifdef __KERNEL__	return cpu_has_feature(CPU_FTR_ALTIVEC);# else	return 1;# endif}#endif const struct raid6_calls raid6_altivec$# = {	raid6_altivec$#_gen_syndrome,	raid6_have_altivec,	"altivecx$#",	0}; #endif /* CONFIG_ALTIVEC */