virtex_start.S revision 1.4
1 /* $NetBSD: virtex_start.S,v 1.4 2009/11/26 00:19:17 matt Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Jachym Holecek 5 * All rights reserved. 6 * 7 * Written for DFC Design, s.r.o. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * This file is based on startup code of Walnut and Explora boards. 34 */ 35 36 #define _NOREGNAMES 37 38 #include "opt_ddb.h" 39 #include "opt_ipkdb.h" 40 #include "opt_lockdebug.h" 41 #include "opt_modular.h" 42 #include "opt_multiprocessor.h" 43 #include "opt_ppcarch.h" 44 #include "opt_ppcparam.h" 45 #include "opt_virtex.h" 46 #include "assym.h" 47 #include "ksyms.h" 48 49 #include <sys/syscall.h> 50 51 #include <machine/param.h> 52 #include <machine/psl.h> 53 #include <machine/trap.h> 54 #include <machine/asm.h> 55 56 #include <powerpc/spr.h> 57 #include <powerpc/ibm4xx/dcr405gp.h> 58 #include <powerpc/ibm4xx/pmap.h> 59 60 61 /* N megabytes. */ 62 #define MB(n) ((n)*1024*1024) 63 64 /* Set bit (beginning with MSB) for each 128MB of RAM. */ 65 #define PHYSMEM_REGIONS_MASK ~((1 << (32 - MB(PHYSMEM)/MB(128))) - 1) 66 67 /* For kvm_mkdb, supposed to mark the start of kernel text. */ 68 .text 69 .globl _C_LABEL(kernel_text) 70 _C_LABEL(kernel_text): 71 72 /* Startup entry. This must be the first thing in the text segment! */ 73 .text 74 .globl __start 75 __start: 76 /* Disable MMU/exceptions */ 77 lis %r0, 0 78 mtmsr %r0 79 80 /* Disable timers */ 81 lis %r0, 0 82 mttcr %r0 83 84 sync 85 isync 86 87 /* Disable caches */ 88 mtdccr %r0 89 mticcr %r0 90 sync 91 isync 92 93 /* Invalidate I$, operands ignored on the 405 */ 94 li %r0,0 /* just in case... */ 95 iccci %r0,%r0 96 97 /* Invalidate D$, hardcoded for 16KB size, 32B line */ 98 li %r7,256 /* # of congruence classes */ 99 mtctr %r7 100 li %r6,0 101 1: 102 dccci %r0,%r6 /* invalidates both ways */ 103 addi %r6,%r6,32 104 bdnz 1b 105 106 /* 107 * Errata 213: Incorrect data may be flushed from the data cache. 108 * Cores: PPC405D5X1, PPC405D5X2 109 * Workaround: #1, CCR0 modification sequence #2 110 * Note: Meaning of bits we need to set is undocumented. 111 */ 112 sync 113 mfccr0 %r0 114 oris %r0,%r0,0x50000000@h 115 mtccr0 %r0 116 isync 117 118 /* 119 * Errata 58: Load string instructions may write incorrect 120 * data into the last GPR targeted in operation. 121 * Cores: PPC405GP 122 * Workaround: set OCM0_DSCNTL[DSEN]=0 and OCM0_DSCNTL[DOF]=0 123 */ 124 mtdcr DCR_OCM0_DSCNTL,%r0 /* Disable Data access to OCM */ 125 126 #if 0 127 /* Allow cacheing for whole RAM. */ 128 lis %r0,PHYSMEM_REGIONS_MASK@ha 129 ori %r0,%r0,PHYSMEM_REGIONS_MASK@l 130 #else 131 #ifndef PPC_4XX_NOCACHE 132 /* Allow cacheing for only the first 1GB of RAM */ 133 lis %r0,0xff00 134 mtdccr %r0 135 mticcr %r0 136 #endif /* PPC_4XX_NOCACHE */ 137 #endif 138 139 /* Invalidate all TLB entries */ 140 tlbia 141 sync 142 isync 143 144 /* Set kernel MMU context, we'll enable MMU in initppc() */ 145 li %r0,KERNEL_PID 146 mtpid %r0 147 sync 148 isync 149 150 /* Setup endkernel argument for initppc() and INIT_CPUINFO */ 151 lis %r4,_C_LABEL(end)@h 152 ori %r4,%r4,_C_LABEL(end)@l 153 154 /* Clear .bss segment */ 155 lis %r7,_C_LABEL(edata)-4@h 156 ori %r7,%r7,_C_LABEL(edata)-4@l 157 li %r3,0 158 2: stwu %r3,4(%r7) 159 cmpw %r7,%r4 160 bne+ 2b 161 162 #if NKSYMS || defined(DDB) || defined(MODULAR) 163 /* We don't have a symbol table, so set startsym = endsym = end */ 164 lis %r7,_C_LABEL(startsym)@ha 165 ori %r7,%r7,_C_LABEL(startsym)@l 166 stw %r4,0(%r7) 167 lis %r7,_C_LABEL(endsym)@ha 168 ori %r7,%r7,_C_LABEL(endsym)@l 169 stw %r4,0(%r7) 170 #endif 171 172 /* INIT_CPUINFO will 'addi', so clean up. */ 173 lis %r1,0 174 175 INIT_CPUINFO(4,1,9,0) 176 177 /* startkernel argument for initppc */ 178 lis %r3,__start@h 179 addi %r3,%r3,__start@l 180 181 bl _C_LABEL(initppc) 182 bl _C_LABEL(main) 183 184 loop: /* UNREACHED */ 185 b loop 186 187 #include <powerpc/ibm4xx/4xx_locore.S> 188
Indexes created Sat Oct 18 16:10:06 GMT 2025