1/* $NetBSD: ofwstart.S,v 1.4 2014/09/20 23:10:46 phx 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#ifdef XCOFF_GLUE 33 .text 34 .globl _entry 35_entry: 36 .long _start,0,0 37#endif /* XCOFF_GLUE */ 38 39 .text 40 .globl _start 41 /* This is the magical note section that IBM machines require 42 * to boot. This should be a note, but gnu ld will not let us 43 * position it at the start of the file. 44 */ 45 # length of name 46 .long 8 47 # note descriptor size 48 .long 24 49 # note type (IEEE 1275) 50 .long 0x1275 51 # name of owner 52 .asciz "PowerPC" 53 .balign 4 54 55 # note descriptor 56 # real mode (-1) or virtual mode (0) 57 .long -1 58 # real-base 59 .long -1 60 # real-size 61 .long -1 62 # virt-base 63 .long -1 64 # virt-size 65 .long -1 66 # load-base 67 .long 0x4000 68 69 /* note for dealing with IBM LPARs */ 70 # length of name 71 .long 24 72 # note descriptor size 73 .long 28 74 # note type 75 .long 0x12759999 76 # name of owner 77 .asciz "IBM,RPA-Client-Config" 78 .balign 4 79 80 # lpar affinity 81 .long 0 82 # minimum size in megabytes 83 .long 64 84 # minimum percentage size 85 .long 0 86 # max pft size ( 2^48 bytes ) 87 .long 48 88 # splpar 89 .long 1 90 # min load ? 91 .long -1 92 # new mem def ? 93 .long 0 94 95_start: 96 sync 97 isync 98 lis %r1,stack+0x20000@ha 99 addi %r1,%r1,stack+0x20000@l 100 101 mfmsr %r8 102 li %r0,0 103 mtmsr %r0 104 isync 105 106 mtibatu 0,%r0 107 mtibatu 1,%r0 108 mtibatu 2,%r0 109 mtibatu 3,%r0 110 mtdbatu 0,%r0 111 mtdbatu 1,%r0 112 mtdbatu 2,%r0 113 mtdbatu 3,%r0 114 115 li %r9,0x12 /* BATL(0, BAT_M, BAT_PP_RW) */ 116 mtibatl 0,%r9 117 mtdbatl 0,%r9 118 li %r9,0x1ffe /* BATU(0, BAT_BL_256M, BAT_Vs) */ 119 mtibatu 0,%r9 120 mtdbatu 0,%r9 121 isync 122 123 mtmsr %r8 124 isync 125 126 /* 127 * Make sure that .bss is zeroed 128 */ 129 130 li %r0,0 131 lis %r8,_edata@ha 132 addi %r8,%r8,_edata@l 133 lis %r9,_end@ha 134 addi %r9,%r9,_end@l 135 1365: cmpw 0,%r8,%r9 137 bge 6f 138 stw %r0,0(%r8) 139 addi %r8,%r8,4 140 b 5b 141 1426: b startup 143