locore.S revision 1.9
1/* $NetBSD: locore.S,v 1.9 2011/01/17 08:23:56 matt 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_ipkdb.h" 74#include "opt_lockdebug.h" 75#include "opt_modular.h" 76#include "opt_multiprocessor.h" 77#include "opt_ppcarch.h" 78#include "opt_ppcparam.h" 79#include "assym.h" 80#include "ksyms.h" 81 82#include <sys/syscall.h> 83 84#include <machine/param.h> 85#include <machine/psl.h> 86#include <machine/trap.h> 87#include <machine/asm.h> 88 89#include <powerpc/spr.h> 90#include <powerpc/ibm4xx/spr.h> 91#include <powerpc/ibm4xx/pmap.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 * Some instructions gas doesn't understand (yet?) 99 */ 100#define bdneq bdnzf 2, 101 102/* 103 * Globals 104 */ 105GLOBAL(intrnames) 106 .asciz "clock", "irq1", "irq2", "irq3" 107 .asciz "irq4", "irq5", "irq6", "irq7" 108 .asciz "irq8", "irq9", "irq10", "irq11" 109 .asciz "irq12", "irq13", "irq14", "irq15" 110 .asciz "irq16", "irq17", "irq18", "irq19" 111 .asciz "irq20", "irq21", "irq22", "irq23" 112 .asciz "irq24", "irq25", "irq26", "irq27" 113 .asciz "irq28", "softnet", "softclock", "softserial" 114 .asciz "statclock" 115GLOBAL(eintrnames) 116 .align 4 117GLOBAL(intrcnt) 118 .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 119 .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 120 .long 0 121GLOBAL(eintrcnt) 122 123/* 124 * This symbol is here for the benefit of kvm_mkdb, and is supposed to 125 * mark the start of kernel text. 126 */ 127 .text 128 .globl _C_LABEL(kernel_text) 129_C_LABEL(kernel_text): 130 131/* 132 * Startup entry. Note, this must be the first thing in the text 133 * segment! 134 */ 135 .text 136 .globl __start 137__start: 138 b 1f 139 /* Reserve some space for info_block required for IBM eval board bootloader */ 140 nop 141 nop 142 nop 143 nop 144 nop 145 nop 146 nop 147 nop 148 nop 149 nop 150 1511: 152 /* Get the board_config_data from openbios */ 153 lis %r3,BOARD_CFG_FP@h 154 ori %r3,%r3,BOARD_CFG_FP@l 155 lwz %r0,0x0(%r3) 156 mtctr %r0 157 bctrl /* call the xcoff function */ 158 mr %r31,%r3 /* Save value in r31 */ 159 160 li %r0,0 161 mtmsr %r0 /* Disable FPU/MMU/exceptions */ 162 isync 163 164 /* PPC405GP errata, item #58. 165 * Load string instructions may write incorrect data into the last GPR 166 * targeted in the operation. 167 * Workaround: set OCM0_DSCNTL[DSEN]=0 and OCM0_DSCNTL[DOF]=0 */ 168 mtdcr DCR_OCM0_DSCNTL, %r0 /* Disable Data access to OCM */ 169 mtdcr DCR_OCM0_ISCNTL, %r0 /* Disable Instruction access to OCM. Just in case */ 170/* 171 * Cpu detect. 172 * 173 */ 174__start_cpu0: 175#ifdef PPC_4XX_NOCACHE 176 /* Disable all caches for physical addresses */ 177 li %r0,0 178#else 179 /* Allow cacheing for only the first 2GB of RAM */ 180 lis %r0,0xffff 181#endif 182 mtdccr %r0 183 mticcr %r0 184 185 /* Invalidate all TLB entries */ 186 tlbia 187 sync 188 isync 189/* get start of bss */ 190 lis %r3,_C_LABEL(_edata)-4@ha 191 addi %r3,%r3,_C_LABEL(_edata)-4@l 192/* get end of kernel memory */ 193 lis %r8,_C_LABEL(end)@ha 194 addi %r8,%r8,_C_LABEL(end)@l 195/* zero bss */ 196 li %r4,0 1972: stwu %r4,%r4(3) 198 cmpw %r3,%r8 199 bne+ 2b 200 201#if NKSYMS || defined(DDB) || defined(MODULAR) 202 /* If we had symbol table location we'd store it here and would've adjusted r8 here */ 203 lis %r7,_C_LABEL(startsym)@ha 204 addi %r7,%r7,_C_LABEL(startsym)@l 205 stw %r8,0(%r7) 206 lis %r7,_C_LABEL(endsym)@ha 207 addi %r7,%r7,_C_LABEL(endsym)@l 208 stw %r8,0(%r7) 209#endif 210 211 /* Set kernel MMU context. */ 212 li %r0,KERNEL_PID 213 mtpid %r0 214 sync 215 216 INIT_CPUINFO(8,1,9,0) 217 mr %r4,%r8 218 219 lis %r3,__start@ha 220 addi %r3,%r3,__start@l 221 222 mr %r6,%r31 /* info_block address */ 223 bl _C_LABEL(initppc) 224 bl _C_LABEL(main) 225 226loop: b loop /* XXX not reached */ 227 228#include <powerpc/ibm4xx/4xx_locore.S> 229