obs600_locore.S revision 1.2
1 /* $NetBSD: obs600_locore.S,v 1.2 2011/01/14 02:06:25 rmind 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 #undef PPC_4XX_NOCACHE 30 #define _NOREGNAMES 31 32 #include "opt_ddb.h" 33 #include "opt_ppcarch.h" 34 #include "opt_ppcparam.h" 35 #include "assym.h" 36 #include "ksyms.h" 37 38 #include <machine/param.h> 39 #include <machine/psl.h> 40 #include <machine/trap.h> 41 #include <machine/asm.h> 42 43 #include <powerpc/ibm4xx/spr.h> 44 #include <powerpc/ibm4xx/pmap.h> 45 46 /* 47 * This symbol is here for the benefit of kvm_mkdb, and is supposed to 48 * mark the start of kernel text. 49 */ 50 .text 51 .globl _C_LABEL(kernel_text) 52 _C_LABEL(kernel_text): 53 54 /* 55 * Kernel start routine for OpenBlockS600 56 * this code is excuted at the very first after the kernel is loaded 57 * by U-Boot. 58 */ 59 .text 60 .globl __start 61 __start: 62 mr %r31, %r3 /* argc of 'go's */ 63 mr %r30, %r4 /* argv of 'go's */ 64 mr %r29, %r6 /* arg string of 'bootm's */ 65 66 li %r0, 0 67 mtmsr %r0 /* Disable FPU/MMU/exceptions */ 68 isync 69 70 #ifdef PPC_4XX_NOCACHE 71 /* Disable all caches for physical addresses */ 72 li %r0, 0 73 #else 74 /* Allow cacheing for only the first 2GB of RAM */ 75 lis %r0, 0xffff 76 #endif 77 mtdccr %r0 78 mticcr %r0 79 80 /* Invalidate all TLB entries */ 81 tlbia 82 sync 83 isync 84 85 /* get start of bss */ 86 lis %r3, _C_LABEL(_edata)-4@ha 87 addi %r3, %r3, _C_LABEL(_edata)-4@l 88 /* get end of kernel memory */ 89 lis %r8, _C_LABEL(end)@ha 90 addi %r8, %r8, _C_LABEL(end)@l 91 /* zero bss */ 92 li %r4, 0 93 2: stwu %r4, %r4(3) 94 cmpw %r3, %r8 95 bne+ 2b 96 97 #if NKSYMS || defined(DDB) || defined(MODULAR) 98 /* If we had symbol table location we'd store it here and would've adjusted r8 here */ 99 lis %r7, _C_LABEL(startsym)@ha 100 addi %r7, %r7, _C_LABEL(startsym)@l 101 stw %r8, 0(%r7) 102 lis %r7, _C_LABEL(endsym)@ha 103 addi %r7, %r7, _C_LABEL(endsym)@l 104 stw %r8, 0(%r7) 105 #endif 106 107 /* Set kernel MMU context. */ 108 li %r0, KERNEL_PID 109 mtpid %r0 110 sync 111 112 INIT_CPUINFO(8,1,9,0) 113 mr %r4, %r8 114 115 lis %r3, __start@ha 116 addi %r3, %r3, __start@l 117 118 mr %r6, %r31 /* argc of 'go's */ 119 mr %r7, %r30 /* argv of 'go's */ 120 mr %r8, %r29 /* arg strings of 'bootm's */ 121 122 bl _C_LABEL(initppc) 123 bl _C_LABEL(main) 124 125 not_reached: 126 b not_reached 127 128 #include <powerpc/ibm4xx/4xx_locore.S> 129
Indexes created Sun Oct 26 13:09:57 GMT 2025