ofwstart.S revision 1.1
1 /* $NetBSD: ofwstart.S,v 1.1 2008/01/09 19:34:45 garbled Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Tim Rightnour 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 by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND 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 THE FOUNDATION OR CONTRIBUTORS 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 #ifdef XCOFF_GLUE 40 .text 41 .globl _entry 42 _entry: 43 .long _start,0,0 44 #endif /* XCOFF_GLUE */ 45 46 .text 47 .globl _start 48 /* This is the magical note section that IBM machines require 49 * to boot. This should be a note, but gnu ld will not let us 50 * position it at the start of the file. 51 */ 52 # length of name 53 .long 8 54 # note descriptor size 55 .long 24 56 # note type (IEEE 1275) 57 .long 0x1275 58 # name of owner 59 .asciz "PowerPC" 60 .balign 4 61 62 # note descriptor 63 # real mode (-1) or virtual mode (0) 64 .long 0 65 # real-base 66 .long -1 67 # real-size 68 .long -1 69 # virt-base 70 .long -1 71 # virt-size 72 .long -1 73 # load-base 74 .long 0x4000 75 76 /* note for dealing with IBM LPARs */ 77 # length of name 78 .long 24 79 # note descriptor size 80 .long 28 81 # note type 82 .long 0x12759999 83 # name of owner 84 .asciz "IBM,RPA-Client-Config" 85 .balign 4 86 87 # lpar affinity 88 .long 0 89 # minimum size in megabytes 90 .long 64 91 # minimum percentage size 92 .long 0 93 # max pft size ( 2^48 bytes ) 94 .long 48 95 # splpar 96 .long 1 97 # min load ? 98 .long -1 99 # new mem def ? 100 .long 0 101 102 _start: 103 sync 104 isync 105 lis %r1,stack@ha 106 addi %r1,%r1,stack@l 107 addi %r1,%r1,8192 108 109 mfmsr %r8 110 li %r0,0 111 mtmsr %r0 112 isync 113 114 mtibatu 0,%r0 115 mtibatu 1,%r0 116 mtibatu 2,%r0 117 mtibatu 3,%r0 118 mtdbatu 0,%r0 119 mtdbatu 1,%r0 120 mtdbatu 2,%r0 121 mtdbatu 3,%r0 122 123 li %r9,0x12 /* BATL(0, BAT_M, BAT_PP_RW) */ 124 mtibatl 0,%r9 125 mtdbatl 0,%r9 126 li %r9,0x1ffe /* BATU(0, BAT_BL_256M, BAT_Vs) */ 127 mtibatu 0,%r9 128 mtdbatu 0,%r9 129 isync 130 131 mtmsr %r8 132 isync 133 134 /* 135 * Make sure that .bss is zeroed 136 */ 137 138 li %r0,0 139 lis %r8,_edata@ha 140 addi %r8,%r8,_edata@l 141 lis %r9,_end@ha 142 addi %r9,%r9,_end@l 143 144 5: cmpw 0,%r8,%r9 145 bge 6f 146 stw %r0,0(%r8) 147 addi %r8,%r8,4 148 b 5b 149 150 6: b startup 151
Indexes created Mon Oct 13 16:09:52 GMT 2025