locore.S revision 1.13
1/* $NetBSD: locore.S,v 1.13 2020/07/06 09:34:17 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#undef PPC_4XX_NOCACHE 71 72#include "assym.h" 73#include "ksyms.h" 74 75#ifdef _KERNEL_OPT 76#include "opt_ddb.h" 77#include "opt_lockdebug.h" 78#include "opt_modular.h" 79#include "opt_multiprocessor.h" 80#include "opt_ppcarch.h" 81#include "opt_ppcparam.h" 82#endif 83 84#include <sys/syscall.h> 85 86#include <machine/param.h> 87#include <machine/psl.h> 88#include <machine/trap.h> 89#include <machine/asm.h> 90 91#include <powerpc/spr.h> 92#include <powerpc/ibm4xx/spr.h> 93#include <powerpc/ibm4xx/dcr4xx.h> 94 95/* Function pointer for requesting board_config_data from openbios*/ 96#define BOARD_CFG_FP 0xFFFE0B50 97 98/* 99 * Some instructions gas doesn't understand (yet?) 100 */ 101#define bdneq bdnzf 2, 102 103/* 104 * Globals 105 */ 106GLOBAL(intrnames) 107 .asciz "clock", "irq1", "irq2", "irq3" 108 .asciz "irq4", "irq5", "irq6", "irq7" 109 .asciz "irq8", "irq9", "irq10", "irq11" 110 .asciz "irq12", "irq13", "irq14", "irq15" 111 .asciz "irq16", "irq17", "irq18", "irq19" 112 .asciz "irq20", "irq21", "irq22", "irq23" 113 .asciz "irq24", "irq25", "irq26", "irq27" 114 .asciz "irq28", "softnet", "softclock", "softserial" 115 .asciz "statclock" 116GLOBAL(eintrnames) 117 .align 4 118GLOBAL(intrcnt) 119 .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 120 .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 121 .long 0 122GLOBAL(eintrcnt) 123 124/* 125 * This symbol is here for the benefit of kvm_mkdb, and is supposed to 126 * mark the start of kernel text. 127 */ 128 .text 129 .globl _C_LABEL(kernel_text) 130_C_LABEL(kernel_text): 131 132/* 133 * Startup entry. Note, this must be the first thing in the text 134 * segment! 135 */ 136 .text 137 .globl __start 138__start: 139 b 1f 140 /* Reserve some space for info_block required for IBM eval board bootloader */ 141 nop 142 nop 143 nop 144 nop 145 nop 146 nop 147 nop 148 nop 149 nop 150 nop 151 1521: 153 /* Get the board_config_data from openbios */ 154 lis %r3,BOARD_CFG_FP@h 155 ori %r3,%r3,BOARD_CFG_FP@l 156 lwz %r0,0x0(%r3) 157 mtctr %r0 158 bctrl /* call the xcoff function */ 159 mr %r31,%r3 /* Save value in r31 */ 160 161 li %r0,0 162 mtmsr %r0 /* Disable FPU/MMU/exceptions */ 163 isync 164 165 /* PPC405GP errata, item #58. 166 * Load string instructions may write incorrect data into the last GPR 167 * targeted in the operation. 168 * Workaround: set OCM0_DSCNTL[DSEN]=0 and OCM0_DSCNTL[DOF]=0 */ 169 mtdcr DCR_OCM0_DSCNTL, %r0 /* Disable Data access to OCM */ 170 mtdcr DCR_OCM0_ISCNTL, %r0 /* Disable Instruction access to OCM. Just in case */ 171/* 172 * Cpu detect. 173 * 174 */ 175__start_cpu0: 176#ifdef PPC_4XX_NOCACHE 177 /* Disable all caches for physical addresses */ 178 li %r0,0 179#else 180 /* Allow cacheing for only the first 2GB of RAM */ 181 lis %r0,0xffff 182#endif 183 mtdccr %r0 184 mticcr %r0 185 186 /* Invalidate all TLB entries */ 187 tlbia 188 sync 189 isync 190/* get start of bss */ 191 lis %r3,_C_LABEL(_edata)-4@ha 192 addi %r3,%r3,_C_LABEL(_edata)-4@l 193/* get end of kernel memory */ 194 lis %r8,_C_LABEL(end)@ha 195 addi %r8,%r8,_C_LABEL(end)@l 196/* zero bss */ 197 li %r4,0 1982: stwu %r4,4(%r3) 199 cmpw %r3,%r8 200 bne+ 2b 201 202#if NKSYMS || defined(DDB) || defined(MODULAR) 203 /* If we had symbol table location we'd store it here and would've adjusted r8 here */ 204 lis %r7,_C_LABEL(startsym)@ha 205 addi %r7,%r7,_C_LABEL(startsym)@l 206 stw %r8,0(%r7) 207 lis %r7,_C_LABEL(endsym)@ha 208 addi %r7,%r7,_C_LABEL(endsym)@l 209 stw %r8,0(%r7) 210#endif 211 212 /* Set kernel MMU context. */ 213 li %r0,KERNEL_PID 214 mtpid %r0 215 sync 216 217 INIT_CPUINFO(8,1,9,0) 218 mr %r4,%r8 219 220 lis %r3,__start@ha 221 addi %r3,%r3,__start@l 222 223 mr %r6,%r31 /* info_block address */ 224 bl _C_LABEL(initppc) 225 bl _C_LABEL(main) 226 227loop: b loop /* XXX not reached */ 228 229#include <powerpc/ibm4xx/4xx_locore.S> 230