/* $NetBSD: 4xx_locore.S,v 1.8 2022/05/31 08:43:15 andvar Exp $ */ /* * Copyright 2001 Wasabi Systems, Inc. * All rights reserved. * * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc. * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project by * Wasabi Systems, Inc. * 4. The name of Wasabi Systems, Inc. may not be used to endorse * or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC * 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. */ /* * Copyright (C) 1995, 1996 Wolfgang Solfrank. * Copyright (C) 1995, 1996 TooLs GmbH. * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by TooLs GmbH. * 4. The name of TooLs GmbH may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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. */ /* * This is not a standalone file. To use it, #include it at * the end of your port's locore.S */ /* * Pull in common PowerPC locore subroutines. */ #include <powerpc/powerpc/locore_subr.S> /* * Pull in common trap vector code. */ #include <powerpc/ibm4xx/trap_subr.S> #include <powerpc/ibm4xx/4xx_trap_subr.S> /* * Include PIO routines */ #include <powerpc/powerpc/pio_subr.S> .globl _C_LABEL(ppc4xx_reset) _C_LABEL(ppc4xx_reset): mfspr %r3,SPR_DBCR0 oris %r3,%r3,DBCR0_RST_SYSTEM@h mtspr SPR_DBCR0,%r3 ba 0 #if 0 /* * XXXX the following doesn't quite work right yet. */ /* * void bcopy(const void *src, void *dst, size_t len); * * swap %r3 and %r4 and fall through to memcopy. */ .globl _C_LABEL(bcopy) _C_LABEL(bcopy): mr %r0,%r3 mr %r3,%r4 mr %r4,%r0 /* FALLTHROUGH */ /* * void *memcpy(void *dst (%r3), const void *src (%r4), size_t len (%r5)); * * Copy memory (obviously) * * We will try to do data cache block aligned stores so we * can use block allocate and not have to read from the * destination. * * Register use: * * %r1 stack (of course) * %r3 dst * %r4 src * %r5 len * %r6 tmp * %r7 holds 32 * %r8 holds dst * %r24-%r31 block move regs * */ ENTRY(memcpy) stwu %r1,-(10*4)(%r1) /* Allocate some RAM to save 8 regs to. */ cmpwi %r5, 32 /* Less than 32 bytes ? */ stmw %r24,8(%r1) /* Save ALL regs (could be optimized) */ mr %r8,%r3 /* save dst */ li %r7,32 dcbt %r0,%r4 /* Start bringing in cache line. */ blt 1f /* Finish up */ neg %r6,%r3 /* Find how far unaligned we are... */ andi. %r6,%r6,31 /* Cache-align dest. */ mtxer %r6 sub %r5,%r5,%r6 /* subtract count */ lswx %r24,%r0,%r4 /* Load some. */ add %r4,%r4,%r6 dcbt %r0,%r4 /* Fetch next line */ stswx %r24,%r0,%r3 /* Store some */ add %r3,%r3,%r6 addic. %r6,%r5,-32 /* Pre-decrement next line */ ble 1f /* Less than 32-bytes? finishup */ /* Dest should not be cache line aligned. */ /* XXX need gas 2.11 to grok dcba insn */ #ifdef GAS_2_11 dcba %r0,%r3 /* Allocate a line */ #else .long 0x7c001dec /* dcba 0,r3 */ #endif 0: dcbt %r7,%r4 /* Bring in the next line, too */ lswi %r24,%r4,32 addi %r4,%r4,32 /* Inc src */ mr %r5,%r6 addic. %r6,%r5,-32 stswi %r24,%r3,32 addi %r3,%r3,32 /* Inc dst */ #ifdef GAS_2_11 dcba 0,%r3 /* Allocate another line */ #else .long 0x7c071dec /* dcba %r7,%r3 */ #endif bgt 0b 1: mtxer %r5 /* Store byte count */ lswx %r24,%r0,%r4 /* Load up to 32 bytes */ stswx %r24,%r0,%r3 /* Store up to 32 bytes */ mr %r3,%r8 /* Return dst */ lmw %r24,8(%r1) addi %r1,%r1,(10*4) blr #endif
