obs600_locore.S revision 1.6.40.1
1 /* $NetBSD: obs600_locore.S,v 1.6.40.1 2021/04/03 22:28:25 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2009 KIYOHARA Takashi 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 25 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "opt_ddb.h" 30 #include "opt_ppcarch.h" 31 #include "opt_ppcparam.h" 32 #include "assym.h" 33 #include "ksyms.h" 34 35 #include <machine/param.h> 36 #include <machine/psl.h> 37 #include <machine/trap.h> 38 #include <machine/asm.h> 39 40 #include <powerpc/ibm4xx/spr.h> 41 42 /* 43 * This symbol is here for the benefit of kvm_mkdb, and is supposed to 44 * mark the start of kernel text. 45 */ 46 .text 47 .globl _C_LABEL(kernel_text) 48 _C_LABEL(kernel_text): 49 50 /* 51 * Kernel start routine for OpenBlockS600 52 * this code is excuted at the very first after the kernel is loaded 53 * by U-Boot. 54 */ 55 .text 56 .globl __start 57 __start: 58 mr %r31, %r3 /* argc of 'go's */ 59 mr %r30, %r4 /* argv of 'go's */ 60 mr %r29, %r6 /* arg string of 'bootm's */ 61 62 li %r0, 0 63 mtmsr %r0 /* Disable FPU/MMU/exceptions */ 64 isync 65 66 #ifdef PPC_4XX_NOCACHE 67 /* Disable all caches for physical addresses */ 68 li %r0, 0 69 #else 70 /* Allow cacheing for only the first 2GB of RAM */ 71 lis %r0, 0xffff 72 #endif 73 mtdccr %r0 74 mticcr %r0 75 76 /* Invalidate all TLB entries */ 77 tlbia 78 sync 79 isync 80 81 /* get start of bss */ 82 lis %r3, _C_LABEL(_edata)-4@ha 83 addi %r3, %r3, _C_LABEL(_edata)-4@l 84 /* get end of kernel memory */ 85 lis %r8, _C_LABEL(end)@ha 86 addi %r8, %r8, _C_LABEL(end)@l 87 /* zero bss */ 88 li %r4, 0 89 2: stwu %r4, 4(%r3) 90 cmpw %r3, %r8 91 bne+ 2b 92 93 #if NKSYMS || defined(DDB) || defined(MODULAR) 94 /* If we had symbol table location we'd store it here and would've adjusted r8 here */ 95 lis %r7, _C_LABEL(startsym)@ha 96 addi %r7, %r7, _C_LABEL(startsym)@l 97 stw %r8, 0(%r7) 98 lis %r7, _C_LABEL(endsym)@ha 99 addi %r7, %r7, _C_LABEL(endsym)@l 100 stw %r8, 0(%r7) 101 #endif 102 103 /* Set kernel MMU context. */ 104 li %r0, KERNEL_PID 105 mtpid %r0 106 sync 107 108 INIT_CPUINFO(8,1,9,0) 109 mr %r4, %r8 110 111 lis %r3, __start@ha 112 addi %r3, %r3, __start@l 113 114 mr %r5, %r31 /* argc of 'go's */ 115 mr %r6, %r30 /* argv of 'go's */ 116 mr %r7, %r29 /* arg strings of 'bootm's */ 117 118 bl _C_LABEL(initppc) 119 bl _C_LABEL(main) 120 121 not_reached: 122 b not_reached 123 124 #include <powerpc/ibm4xx/4xx_locore.S> 125
Indexes created Wed Oct 29 12:09:47 GMT 2025