1/* $NetBSD: locore.S,v 1.52 2021/02/26 02:18:56 thorpej Exp $ */ 2 3/* 4 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 5 * Copyright (C) 1995, 1996 TooLs GmbH. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by TooLs GmbH. 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34#include "opt_ddb.h" 35#include "opt_lockdebug.h" 36#include "opt_modular.h" 37#include "opt_multiprocessor.h" 38#include "opt_ppcparam.h" 39#include "assym.h" 40 41#include <sys/syscall.h> 42 43#include <machine/param.h> 44#include <machine/psl.h> 45#include <machine/trap.h> 46#include <machine/asm.h> 47 48#include <powerpc/spr.h> 49#include <powerpc/oea/spr.h> 50 51#include "ksyms.h" 52 53/* 54 * Some instructions gas doesn't understand (yet?) 55 */ 56#define bdneq bdnzf 2, 57 58/* 59 * Globals 60 */ 61 .data 62GLOBAL(esym) 63 .long 0 /* end of symbol table */ 64 65/* 66 * This symbol is here for the benefit of kvm_mkdb, and is supposed to 67 * mark the start of kernel text. 68 */ 69 .text 70 .globl _C_LABEL(kernel_text) 71_C_LABEL(kernel_text): 72 73/* 74 * Startup entry. Note, this must be the first thing in the text 75 * segment! 76 * 77 * Register state as transfer is passed from OpenFirmware / boot loader: 78 * 79 * %r1 Stack provided by OpenFirmware / boot loader 80 * %r3 Reserved for platform binding (unused here) 81 * %r4 Reserved for platform binding (unused here) 82 * %r5 OpenFirmware client entry point 83 * %r6 Arguments 84 * %r7 Arguments length 85 */ 86 .text 87 .globl __start 88__start: 89 /* Save off arguments that we need preserved. */ 90 mr %r13,%r6 91 mr %r14,%r7 92 93 bl _C_LABEL(ofwinit) /* init OF */ 94 95 li %r0,0 96 mtmsr %r0 /* Disable FPU/MMU/exceptions */ 97 98 bl _C_LABEL(cpu_model_init) 99 lis %r12,oeacpufeat@ha 100 lwz %r12,oeacpufeat@l(%r12) 101 andi. %r12,%r12,OEACPU_64_BRIDGE /* Compare against OEACPU_64_BRIDGE */ 102 beq 2f /* skip if this is a 32bit part */ 103 li %r0,0 104 sync 105 slbia /* invalidate the slb table */ 106 sync 107 clrldi %r0,%r0,32 /* clear SF/ISF (high order bits) */ 108 mtmsrd %r0 109 mtspr 0x118,0 /* clear ASR[V] to enable segregs */ 1102: 111 isync 112 /* compute end of kernel memory */ 113 lis %r4,_C_LABEL(end)@ha 114 addi %r4,%r4,_C_LABEL(end)@l 115#if NKSYMS || defined(DDB) || defined(MODULAR) 116 /* skip symbol table */ 117 mr %r6,%r13 118 mr %r7,%r14 119 cmpwi %r6,0 120 beq 1f 121 add %r9,%r6,%r7 /* r9 = args + l */ 122 lwz %r9,-8(%r9) /* esym */ 123 cmpwi %r9,0 124 beq 1f 125 mr %r4,%r9 1261: 127#endif 128 129 130 /* 131 * Initialize cpu_info[0] 132 */ 133 INIT_CPUINFO(%r4,%r1,%r9,%r0) 134 135 lis %r3,__start@ha 136 addi %r3,%r3,__start@l 137 mr %r5,%r6 /* args string */ 138 bl _C_LABEL(initppc) 139 bl _C_LABEL(main) 140 b _C_LABEL(OF_exit) 141 142/* 143 * Pull in common OFW code. 144 */ 145#include <powerpc/oea/ofw_subr.S> 146 147/* 148 * Pull in common switch / setfault code. 149 */ 150#include <powerpc/powerpc/locore_subr.S> 151 152/* 153 * Pull in common trap vector code. 154 */ 155#include <powerpc/powerpc/trap_subr.S> 156 157/* 158 * Pull in common pio / bus_space code. 159 */ 160#include <powerpc/powerpc/pio_subr.S> 161