1/*	$NetBSD: kickstart.S,v 1.3 2008/04/28 20:23:13 martin 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 *
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#define PPC_CACHESIZE 16384
33#define PPC_LINESIZE 32
34
35/*
36Memst:	.long	0x08000000
37Krnst:	.long	0x082f3400
38Krnsz:	.long	0x00100000
39 */
40	.globl _start
41_start:
42	bl	L2	/* we start with this address @ 0xfff00100 */
43L2:
44	lis	13,0xf60000@ha
45	li	14,0x08
46	stb	14,0xf60000@l(13)
47#ifdef DEBUG
48	lis	13,0xdff180@h
49	ori	13,13,0xdff180@l
50
51	lis	12,1000000@h
52	ori	12,12,1000000@l
53	mtctr	12
54L2a:
55	li	14,0x00f
56	sth	14,0(13)
57	sync
58	li	14,0xf0f
59	sth	14,0(13)
60	sync
61	bdnz	L2a
62#endif
63	mflr	3
64	lwz	4,-16(3)
65	lwz	5,-12(3)
66	lwz	6,-8(3)
67	li	7,3
68	addi	8,6,3
69	cmplw	4,5
70	andc	8,8,7
71	srwi	9,8,2
72	mtctr	9
73	bgt	Lb0
74/* here: copying downwards and forwards */
75	lwz	9,0(5)
76	stw	9,0(4)
77	bdz	Lflush
78Lf1:	lwzu	7,4(5)
79	stwu	7,4(4)
80	bdnz	Lf1
81	b	Lflush
82
83Lb0:	add	4,4,8	/* add the rounded up length */
84	add	5,5,8	/* add the rounded up length */
85Lb1:	lwzu	7,-4(5)
86	stwu	7,-4(4)
87	bdnz	Lb1
88
89Lflush:
90#ifdef DEBUG
91	li	14,0xff0
92	sth	14,0(13)
93	sync
94#endif
95	li	10,PPC_CACHESIZE/PPC_LINESIZE
96	li	11,PPC_LINESIZE
97/* dcbst loop */
98	mtctr	10
99	lwz	12,-8(3)
100Lfl1:	dcbst	0,12
101	add	12,12,11
102	bdnz	Lfl1
103	sync		/* and wait for past instructions to finish */
104/* icbi loop */
105	mtctr	10
106	lwz	12,-8(3)
107Lfl2:	icbi	0,12
108	add	12,12,11
109	bdnz	Lfl2
110	sync		/* and wait for past instructions to finish */
111	isync		/* and flush instruction queue */
112Ljump:
113#ifdef DEBUG
114	li	14,0x0f0
115	sth	14,0(13)
116	sync
117#endif
118	lwz	3,-16(3)
119	mtlr	3
120	blr
121/* NOTREACHED */
122