1/* $NetBSD: locore.S,v 1.17 2021/03/30 01:57:20 rin Exp $ */ 2/* $OpenBSD: locore.S,v 1.4 1997/01/26 09:06:38 rahnds Exp $ */ 3 4/* 5 * Copyright 2001 Wasabi Systems, Inc. 6 * All rights reserved. 7 * 8 * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed for the NetBSD Project by 21 * Wasabi Systems, Inc. 22 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 23 * or promote products derived from this software without specific prior 24 * written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39/* 40 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 41 * Copyright (C) 1995, 1996 TooLs GmbH. 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by TooLs GmbH. 55 * 4. The name of TooLs GmbH may not be used to endorse or promote products 56 * derived from this software without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 59 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 60 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 61 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 62 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 63 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 64 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 65 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 66 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 67 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 68 */ 69 70#ifdef PPC_4XX_NOCACHE 71#error "Fix me" 72#endif 73 74#include "assym.h" 75#include "ksyms.h" 76 77#ifdef _KERNEL_OPT 78#include "opt_ddb.h" 79#include "opt_modular.h" 80#include "opt_ppcparam.h" 81#endif 82 83#include <sys/syscall.h> 84 85#include <machine/param.h> 86#include <machine/psl.h> 87#include <machine/trap.h> 88#include <machine/asm.h> 89 90#include <powerpc/spr.h> 91#include <powerpc/ibm4xx/spr.h> 92#include <powerpc/ibm4xx/dcr4xx.h> 93 94/* Function pointer for requesting board_config_data from openbios*/ 95#define BOARD_CFG_FP 0xFFFE0B50 96 97/* 98 * This symbol is here for the benefit of kvm_mkdb, and is supposed to 99 * mark the start of kernel text. 100 */ 101 .text 102 .globl _C_LABEL(kernel_text) 103_C_LABEL(kernel_text): 104 105/* 106 * Startup entry. Note, this must be the first thing in the text 107 * segment! 108 */ 109 .text 110 .globl __start 111__start: 112 b 1f 113 /* Reserve some space for info_block required for IBM eval board bootloader */ 114 nop 115 nop 116 nop 117 nop 118 nop 119 nop 120 nop 121 nop 122 nop 123 nop 124 1251: 126 /* Get the board_config_data from openbios */ 127 lis %r3,BOARD_CFG_FP@h 128 ori %r3,%r3,BOARD_CFG_FP@l 129 lwz %r0,0x0(%r3) 130 mtctr %r0 131 bctrl /* call the xcoff function */ 132 mr %r31,%r3 /* Save value in r31 */ 133 134 li %r0,0 135 mtmsr %r0 /* Disable FPU/MMU/exceptions */ 136 isync 137 138 /* PPC405GP errata, item #58. 139 * Load string instructions may write incorrect data into the last GPR 140 * targeted in the operation. 141 * Workaround: set OCM0_DSCNTL[DSEN]=0 and OCM0_DSCNTL[DOF]=0 */ 142 mtdcr DCR_OCM0_DSCNTL, %r0 /* Disable Data access to OCM */ 143 mtdcr DCR_OCM0_ISCNTL, %r0 /* Disable Instruction access to OCM. Just in case */ 144/* 145 * Cpu detect. 146 * 147 */ 148__start_cpu0: 149#ifdef PPC_4XX_NOCACHE 150 /* Disable all caches for physical addresses */ 151 li %r0,0 152#else 153 /* Allow cacheing for only the first 2GB of RAM */ 154 lis %r0,0xffff 155#endif 156 mtdccr %r0 157 mticcr %r0 158 159 /* Invalidate all TLB entries */ 160 tlbia 161 sync 162 isync 163/* get start of bss */ 164 lis %r3,_C_LABEL(_edata)-4@ha 165 addi %r3,%r3,_C_LABEL(_edata)-4@l 166/* get end of kernel memory */ 167 lis %r8,_C_LABEL(end)@ha 168 addi %r8,%r8,_C_LABEL(end)@l 169/* zero bss */ 170 li %r4,0 1712: stwu %r4,4(%r3) 172 cmpw %r3,%r8 173 bne+ 2b 174 175#if NKSYMS || defined(DDB) || defined(MODULAR) 176 /* If we had symbol table location we'd store it here and would've adjusted r8 here */ 177 lis %r7,_C_LABEL(startsym)@ha 178 addi %r7,%r7,_C_LABEL(startsym)@l 179 stw %r8,0(%r7) 180 lis %r7,_C_LABEL(endsym)@ha 181 addi %r7,%r7,_C_LABEL(endsym)@l 182 stw %r8,0(%r7) 183#endif 184 185 /* Set kernel MMU context. */ 186 li %r0,KERNEL_PID 187 mtpid %r0 188 sync 189 190 INIT_CPUINFO(%r8,%r1,%r9,%r0) 191 mr %r4,%r8 192 193 lis %r3,__start@ha 194 addi %r3,%r3,__start@l 195 196 mr %r6,%r31 /* info_block address */ 197 bl _C_LABEL(initppc) 198 bl _C_LABEL(main) 199 200loop: b loop /* XXX not reached */ 201 202#include <powerpc/ibm4xx/4xx_locore.S> 203