kickstart.S revision 1.2.6.2
1 /* $NetBSD: kickstart.S,v 1.2.6.2 2000/11/20 19:58:51 bouyer Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Ignatios Souvatzis. 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 #define PPC_CACHESIZE 16384 40 #define PPC_LINESIZE 32 41 42 /* 43 Memst: .long 0x08000000 44 Krnst: .long 0x082f3400 45 Krnsz: .long 0x00100000 46 */ 47 .globl _start 48 _start: 49 bl L2 /* we start with this address @ 0xfff00100 */ 50 L2: 51 lis 13,0xf60000@ha 52 li 14,0x08 53 stb 14,0xf60000@l(13) 54 #ifdef DEBUG 55 lis 13,0xdff180@h 56 ori 13,13,0xdff180@l 57 58 lis 12,1000000@h 59 ori 12,12,1000000@l 60 mtctr 12 61 L2a: 62 li 14,0x00f 63 sth 14,0(13) 64 sync 65 li 14,0xf0f 66 sth 14,0(13) 67 sync 68 bdnz L2a 69 #endif 70 mflr 3 71 lwz 4,-16(3) 72 lwz 5,-12(3) 73 lwz 6,-8(3) 74 li 7,3 75 addi 8,6,3 76 cmplw 4,5 77 andc 8,8,7 78 srwi 9,8,2 79 mtctr 9 80 bgt Lb0 81 /* here: copying downwards and forwards */ 82 lwz 9,0(5) 83 stw 9,0(4) 84 bdz Lflush 85 Lf1: lwzu 7,4(5) 86 stwu 7,4(4) 87 bdnz Lf1 88 b Lflush 89 90 Lb0: add 4,4,8 /* add the rounded up length */ 91 add 5,5,8 /* add the rounded up length */ 92 Lb1: lwzu 7,-4(5) 93 stwu 7,-4(4) 94 bdnz Lb1 95 96 Lflush: 97 #ifdef DEBUG 98 li 14,0xff0 99 sth 14,0(13) 100 sync 101 #endif 102 li 10,PPC_CACHESIZE/PPC_LINESIZE 103 li 11,PPC_LINESIZE 104 /* dcbst loop */ 105 mtctr 10 106 lwz 12,-8(3) 107 Lfl1: dcbst 0,12 108 add 12,12,11 109 bdnz Lfl1 110 sync /* and wait for past instructions to finish */ 111 /* icbi loop */ 112 mtctr 10 113 lwz 12,-8(3) 114 Lfl2: icbi 0,12 115 add 12,12,11 116 bdnz Lfl2 117 sync /* and wait for past instructions to finish */ 118 isync /* and flush instruction queue */ 119 Ljump: 120 #ifdef DEBUG 121 li 14,0x0f0 122 sth 14,0(13) 123 sync 124 #endif 125 lwz 3,-16(3) 126 mtlr 3 127 blr 128 /* NOTREACHED */ 129
Indexes created Wed Oct 29 20:09:47 GMT 2025