1 /* $NetBSD: 4xx_locore.S,v 1.8 2022/05/31 08:43:15 andvar Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 40 * Copyright (C) 1995, 1996 TooLs GmbH. 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by TooLs GmbH. 54 * 4. The name of TooLs GmbH may not be used to endorse or promote products 55 * derived from this software without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 58 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 59 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 60 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 61 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 62 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 63 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 64 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 65 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 66 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 67 */ 68 69 /* 70 * This is not a standalone file. To use it, #include it at 71 * the end of your port's locore.S 72 */ 73 74 /* 75 * Pull in common PowerPC locore subroutines. 76 */ 77 #include <powerpc/powerpc/locore_subr.S> 78 79 /* 80 * Pull in common trap vector code. 81 */ 82 #include <powerpc/ibm4xx/trap_subr.S> 83 #include <powerpc/ibm4xx/4xx_trap_subr.S> 84 85 /* 86 * Include PIO routines 87 */ 88 #include <powerpc/powerpc/pio_subr.S> 89 90 .globl _C_LABEL(ppc4xx_reset) 91 _C_LABEL(ppc4xx_reset): 92 mfspr %r3,SPR_DBCR0 93 oris %r3,%r3,DBCR0_RST_SYSTEM@h 94 mtspr SPR_DBCR0,%r3 95 ba 0 96 97 #if 0 98 /* 99 * XXXX the following doesn't quite work right yet. 100 */ 101 /* 102 * void bcopy(const void *src, void *dst, size_t len); 103 * 104 * swap %r3 and %r4 and fall through to memcopy. 105 */ 106 .globl _C_LABEL(bcopy) 107 _C_LABEL(bcopy): 108 mr %r0,%r3 109 mr %r3,%r4 110 mr %r4,%r0 111 /* FALLTHROUGH */ 112 113 /* 114 * void *memcpy(void *dst (%r3), const void *src (%r4), size_t len (%r5)); 115 * 116 * Copy memory (obviously) 117 * 118 * We will try to do data cache block aligned stores so we 119 * can use block allocate and not have to read from the 120 * destination. 121 * 122 * Register use: 123 * 124 * %r1 stack (of course) 125 * %r3 dst 126 * %r4 src 127 * %r5 len 128 * %r6 tmp 129 * %r7 holds 32 130 * %r8 holds dst 131 * %r24-%r31 block move regs 132 * 133 */ 134 135 ENTRY(memcpy) 136 stwu %r1,-(10*4)(%r1) /* Allocate some RAM to save 8 regs to. */ 137 cmpwi %r5, 32 /* Less than 32 bytes ? */ 138 stmw %r24,8(%r1) /* Save ALL regs (could be optimized) */ 139 140 mr %r8,%r3 /* save dst */ 141 li %r7,32 142 143 dcbt %r0,%r4 /* Start bringing in cache line. */ 144 blt 1f /* Finish up */ 145 146 neg %r6,%r3 /* Find how far unaligned we are... */ 147 andi. %r6,%r6,31 /* Cache-align dest. */ 148 mtxer %r6 149 sub %r5,%r5,%r6 /* subtract count */ 150 lswx %r24,%r0,%r4 /* Load some. */ 151 add %r4,%r4,%r6 152 dcbt %r0,%r4 /* Fetch next line */ 153 stswx %r24,%r0,%r3 /* Store some */ 154 add %r3,%r3,%r6 155 addic. %r6,%r5,-32 /* Pre-decrement next line */ 156 ble 1f /* Less than 32-bytes? finishup */ 157 158 /* Dest should not be cache line aligned. */ 159 /* XXX need gas 2.11 to grok dcba insn */ 160 #ifdef GAS_2_11 161 dcba %r0,%r3 /* Allocate a line */ 162 #else 163 .long 0x7c001dec /* dcba 0,r3 */ 164 #endif 165 0: 166 dcbt %r7,%r4 /* Bring in the next line, too */ 167 168 lswi %r24,%r4,32 169 addi %r4,%r4,32 /* Inc src */ 170 mr %r5,%r6 171 172 addic. %r6,%r5,-32 173 stswi %r24,%r3,32 174 addi %r3,%r3,32 /* Inc dst */ 175 #ifdef GAS_2_11 176 dcba 0,%r3 /* Allocate another line */ 177 #else 178 .long 0x7c071dec /* dcba %r7,%r3 */ 179 #endif 180 bgt 0b 181 1: 182 mtxer %r5 /* Store byte count */ 183 lswx %r24,%r0,%r4 /* Load up to 32 bytes */ 184 stswx %r24,%r0,%r3 /* Store up to 32 bytes */ 185 186 mr %r3,%r8 /* Return dst */ 187 188 lmw %r24,8(%r1) 189 addi %r1,%r1,(10*4) 190 blr 191 #endif 192
Indexes created Sat Sep 20 22:09:52 GMT 2025