/* $NetBSD: bzero.S,v 1.15 2016/12/19 14:30:23 christos Exp $ */ /*- * Copyright (C) 2001 Martin J. Laubach <mjl@NetBSD.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /*----------------------------------------------------------------------*/ #include <machine/asm.h> #if defined(LIBC_SCCS) && !defined(lint) __RCSID("$NetBSD: bzero.S,v 1.15 2016/12/19 14:30:23 christos Exp $") #endif /* LIBC_SCCS && !lint */ #include "assym.h" #define USE_STSWX 0 /* don't. slower than trivial copy loop */ /*----------------------------------------------------------------------*/ /* void bzero(void *b %r3, size_t len %r4); void * memset(void *b %r3, int c %r4, size_t len %r5); */ /*----------------------------------------------------------------------*/ #define r_dst %r3 #define r_len %r4 #define r_val %r0 .text .align 4 ENTRY(bzero) li r_val, 0 /* Value to stuff in */ cmplwi %cr1, %r4, 0 /* Zero length? */ beqlr- %cr1 /* Yes, do nothing */ b cb_memset END(bzero) ENTRY(memset) cmplwi %cr1, %r5, 0 mr. %r0, %r4 mr %r8, %r3 beqlr- %cr1 /* Nothing to do */ rlwimi %r0, %r4, 8, 16, 23 /* word extend fill value */ rlwimi %r0, %r0, 16, 0, 15 mr %r4, %r5 bne- simple_fill /* =! 0, use trivial fill */ cb_memset: /*----------------------------------------------------------------------*/ #ifndef _KERNEL #ifdef __PIC__ /* First get cache line size */ mflr %r9 bcl 20,31,1f 1: mflr %r10 mtlr %r9 addis %r10,%r10,_libc_powerpc_cache_info+CACHE_INFO_DCACHE_LINE_SIZE-1b@ha lwz %r9,_libc_powerpc_cache_info+CACHE_INFO_DCACHE_LINE_SIZE-1b@l(%r10) #else lis %r10,_libc_powerpc_cache_info+CACHE_INFO_DCACHE_LINE_SIZE@ha lwz %r9,_libc_powerpc_cache_info+CACHE_INFO_DCACHE_LINE_SIZE@l(%r10) #endif cmplwi %cr1, %r9, 0 /* Unknown? */ beq- simple_fill /* a trivial fill routine */ #else /* _KERNEL */ #ifdef MULTIPROCESSOR mfsprg %r10, 0 /* Get cpu_info pointer */ #else lis %r10, cpu_info_store@ha addi %r10, %r10, cpu_info_store@l #endif lwz %r9, CPU_CI+CACHE_INFO_DCACHE_LINE_SIZE(%r10) /* Load D$ line size */ #endif /* _KERNEL */ cntlzw %r10, %r9 /* Calculate shift.. */ li %r6, 31 subf %r10, %r10, %r6 /* Back in memory filling business */ cmplwi %cr1, r_len, 0 /* Nothing to do? */ add %r5, %r9, %r9 cmplw r_len, %r5 /* <= 2*CL bytes to move? */ beqlr- %cr1 /* then do nothing */ blt+ simple_fill /* a trivial fill routine */ /* Word align the block, fill bytewise until dst even*/ andi. %r5, r_dst, 0x03 li %r6, 4 beq+ cb_aligned_w /* already aligned to word? */ subf %r5, %r5, %r6 /* bytes to fill to align4 */ #if USE_STSWX mtxer %r5 stswx %r0, 0, r_dst add r_dst, %r5, r_dst #else mtctr %r5 subi r_dst, r_dst, 1 1: stbu r_val, 1(r_dst) /* Fill bytewise */ bdnz 1b addi r_dst, r_dst, 1 #endif subf r_len, %r5, r_len cb_aligned_w: /* Cache block align, fill wordwise until dst aligned */ /* I know I have something to do since we had > 2*CL initially */ /* so no need to check for r_len = 0 */ subi %r6, %r9, 1 /* CL mask */ and. %r5, r_dst, %r6 srwi %r5, %r5, 2 srwi %r6, %r9, 2 beq cb_aligned_cb /* already on CL boundary? */ subf %r5, %r5, %r6 /* words to fill to alignment */ mtctr %r5 slwi %r5, %r5, 2 subf r_len, %r5, r_len subi r_dst, r_dst, 4 1: stwu r_val, 4(r_dst) /* Fill wordwise */ bdnz 1b addi r_dst, r_dst, 4 cb_aligned_cb: /* no need to check r_len, see above */ srw. %r5, r_len, %r10 /* Number of cache blocks */ mtctr %r5 beq cblocks_done slw %r5, %r5, %r10 subf r_len, %r5, r_len 1: dcbz 0, r_dst /* Clear blockwise */ add r_dst, r_dst, %r9 bdnz 1b cblocks_done: /* still CL aligned, but less than CL bytes left */ cmplwi %cr1, r_len, 0 cmplwi r_len, 8 beq- %cr1, sf_return blt- sf_bytewise /* <8 remaining? */ b sf_aligned_w /*----------------------------------------------------------------------*/ wbzero: li r_val, 0 cmplwi r_len, 0 beqlr- /* Nothing to do */ simple_fill: #if USE_STSWX cmplwi %cr1, r_len, 12 /* < 12 bytes to move? */ #else cmplwi %cr1, r_len, 8 /* < 8 bytes to move? */ #endif andi. %r5, r_dst, 0x03 /* bytes to fill to align4 */ blt %cr1, sf_bytewise /* trivial byte mover */ li %r6, 4 subf %r5, %r5, %r6 beq+ sf_aligned_w /* dest is word aligned */ #if USE_STSWX mtxer %r5 stswx %r0, 0, r_dst add r_dst, %r5, r_dst #else mtctr %r5 /* nope, then fill bytewise */ subi r_dst, r_dst, 1 /* until it is */ 1: stbu r_val, 1(r_dst) bdnz 1b addi r_dst, r_dst, 1 #endif subf r_len, %r5, r_len sf_aligned_w: /* no need to check r_len since it were >= 8 bytes initially */ #if USE_STSWX mr %r6, %r0 mr %r7, %r0 srwi %r5, r_len, 3 mtctr %r5 slwi %r5, %r5, 3 /* adjust len */ subf. r_len, %r5, r_len 1: stswi %r6, r_dst, 8 addi r_dst, r_dst, 8 bdnz 1b #else srwi %r5, r_len, 2 /* words to fill */ mtctr %r5 slwi %r5, %r5, 2 subf. r_len, %r5, r_len /* adjust len for fill */ subi r_dst, r_dst, 4 1: stwu r_val, 4(r_dst) bdnz 1b addi r_dst, r_dst, 4 #endif sf_word_done: bne- sf_bytewise sf_return: mr %r3, %r8 /* restore orig ptr */ blr /* for memset functionality */ sf_bytewise: #if USE_STSWX mr %r5, %r0 mr %r6, %r0 mr %r7, %r0 mtxer r_len stswx %r5, 0, r_dst #else mtctr r_len subi r_dst, r_dst, 1 1: stbu r_val, 1(r_dst) bdnz 1b #endif mr %r3, %r8 /* restore orig ptr */ blr /* for memset functionality */ END(memset) /*----------------------------------------------------------------------*/ #ifndef _KERNEL .data .p2align 2 cache_info: .long -1, -1, -1, -1 cache_sh: .long 0 #endif /*----------------------------------------------------------------------*/
