locore.S revision 1.12
1/* $NetBSD: locore.S,v 1.12 2018/07/15 05:16:44 maxv 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 "opt_ddb.h" 73#include "opt_lockdebug.h" 74#include "opt_modular.h" 75#include "opt_multiprocessor.h" 76#include "opt_ppcarch.h" 77#include "opt_ppcparam.h" 78#include "assym.h" 79#include "ksyms.h" 80 81#include <sys/syscall.h> 82 83#include <machine/param.h> 84#include <machine/psl.h> 85#include <machine/trap.h> 86#include <machine/asm.h> 87 88#include <powerpc/spr.h> 89#include <powerpc/ibm4xx/spr.h> 90#include <powerpc/ibm4xx/dcr4xx.h> 91 92/* Function pointer for requesting board_config_data from openbios*/ 93#define BOARD_CFG_FP 0xFFFE0B50 94 95/* 96 * Some instructions gas doesn't understand (yet?) 97 */ 98#define bdneq bdnzf 2, 99 100/* 101 * Globals 102 */ 103GLOBAL(intrnames) 104 .asciz "clock", "irq1", "irq2", "irq3" 105 .asciz "irq4", "irq5", "irq6", "irq7" 106 .asciz "irq8", "irq9", "irq10", "irq11" 107 .asciz "irq12", "irq13", "irq14", "irq15" 108 .asciz "irq16", "irq17", "irq18", "irq19" 109 .asciz "irq20", "irq21", "irq22", "irq23" 110 .asciz "irq24", "irq25", "irq26", "irq27" 111 .asciz "irq28", "softnet", "softclock", "softserial" 112 .asciz "statclock" 113GLOBAL(eintrnames) 114 .align 4 115GLOBAL(intrcnt) 116 .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 117 .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 118 .long 0 119GLOBAL(eintrcnt) 120 121/* 122 * This symbol is here for the benefit of kvm_mkdb, and is supposed to 123 * mark the start of kernel text. 124 */ 125 .text 126 .globl _C_LABEL(kernel_text) 127_C_LABEL(kernel_text): 128 129/* 130 * Startup entry. Note, this must be the first thing in the text 131 * segment! 132 */ 133 .text 134 .globl __start 135__start: 136 b 1f 137 /* Reserve some space for info_block required for IBM eval board bootloader */ 138 nop 139 nop 140 nop 141 nop 142 nop 143 nop 144 nop 145 nop 146 nop 147 nop 148 1491: 150 /* Get the board_config_data from openbios */ 151 lis %r3,BOARD_CFG_FP@h 152 ori %r3,%r3,BOARD_CFG_FP@l 153 lwz %r0,0x0(%r3) 154 mtctr %r0 155 bctrl /* call the xcoff function */ 156 mr %r31,%r3 /* Save value in r31 */ 157 158 li %r0,0 159 mtmsr %r0 /* Disable FPU/MMU/exceptions */ 160 isync 161 162 /* PPC405GP errata, item #58. 163 * Load string instructions may write incorrect data into the last GPR 164 * targeted in the operation. 165 * Workaround: set OCM0_DSCNTL[DSEN]=0 and OCM0_DSCNTL[DOF]=0 */ 166 mtdcr DCR_OCM0_DSCNTL, %r0 /* Disable Data access to OCM */ 167 mtdcr DCR_OCM0_ISCNTL, %r0 /* Disable Instruction access to OCM. Just in case */ 168/* 169 * Cpu detect. 170 * 171 */ 172__start_cpu0: 173#ifdef PPC_4XX_NOCACHE 174 /* Disable all caches for physical addresses */ 175 li %r0,0 176#else 177 /* Allow cacheing for only the first 2GB of RAM */ 178 lis %r0,0xffff 179#endif 180 mtdccr %r0 181 mticcr %r0 182 183 /* Invalidate all TLB entries */ 184 tlbia 185 sync 186 isync 187/* get start of bss */ 188 lis %r3,_C_LABEL(_edata)-4@ha 189 addi %r3,%r3,_C_LABEL(_edata)-4@l 190/* get end of kernel memory */ 191 lis %r8,_C_LABEL(end)@ha 192 addi %r8,%r8,_C_LABEL(end)@l 193/* zero bss */ 194 li %r4,0 1952: stwu %r4,4(%r3) 196 cmpw %r3,%r8 197 bne+ 2b 198 199#if NKSYMS || defined(DDB) || defined(MODULAR) 200 /* If we had symbol table location we'd store it here and would've adjusted r8 here */ 201 lis %r7,_C_LABEL(startsym)@ha 202 addi %r7,%r7,_C_LABEL(startsym)@l 203 stw %r8,0(%r7) 204 lis %r7,_C_LABEL(endsym)@ha 205 addi %r7,%r7,_C_LABEL(endsym)@l 206 stw %r8,0(%r7) 207#endif 208 209 /* Set kernel MMU context. */ 210 li %r0,KERNEL_PID 211 mtpid %r0 212 sync 213 214 INIT_CPUINFO(8,1,9,0) 215 mr %r4,%r8 216 217 lis %r3,__start@ha 218 addi %r3,%r3,__start@l 219 220 mr %r6,%r31 /* info_block address */ 221 bl _C_LABEL(initppc) 222 bl _C_LABEL(main) 223 224loop: b loop /* XXX not reached */ 225 226#include <powerpc/ibm4xx/4xx_locore.S> 227