1/*	$NetBSD: start.S,v 1.1 2005/12/29 15:20:09 tsutsui Exp $	*/
2
3/*-
4 * Copyright (c) 2004 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by UCHIYAMA Yasushi.
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#include <mips/regdef.h>
33
34	.set	noreorder
35	.set	mips3
36	.align	2
37	.text
38/*
39 * Entry point.
40 */
41	.globl	start
42start:
43	nop
44	nop
45	nop
46	nop
47	la	sp, _ftext
48
49	mfc0	t0, $12
50	lui	t1, 0x0040	/* BEV : use IPL's exception vector. */
51	and	t0, t0, t1
52	mtc0	t0, $12
53	nop
54	la	t0, main
55	move	a1, v0
56	jr	t0
57	 move	a2, v1		/* v1 = mainfo */
581:	b	1b
59	 nop
60	/* NOTREACHED */
61
62#if 0 /* ROM putc test */
63	li	a0, 50		/* x-pos */
642:	li	a2, 90		/* 'Z' */
65	lui	v0, 0xbfc0
66	ori	v0, 0xff60
67	li	a1, 50		/* y-pos */
68	jal	v0
69	 nop
70	b	2b
71	 addiu	a0, a0, 12
72	/* NOTREACHED */
73#endif
74#if 0 /* Frame buffer (TLB kseg2 mapped by IPL) test */
75	move	a3, zero
76	xori	a3, a3, 0x00
773:	sll	v0, a3, 0x18
78	sra	a2, v0, 0x18
79	lui	a0, 0xf000
80	move	v1, zero
81	lui	a1, 0x1
82	ori	a1, a1, 0xffff
832:	sb	a2, 0(a0)
84	addiu	v1, v1, 1
85	slt	v0, a1, v1
86	addiu	a0, a0, 1
87	beqz	v0, 2b
88	 nop
89	xori	a3, a3, 0xff
90	j	3b
91	 nop
92	/* NOTREACHED */
93#endif
94
95/*
96 * void tlb_read(int index, void *)
97 */
98	.global	tlb_read
99	.ent	tlb_read
100tlb_read:
101	mtc0	a0, $0		/* Index Register */
102	nop; nop; nop; nop;
103	tlbr
104	nop; nop; nop; nop;
105	mfc0	t0, $5		/* PageMask */
106	nop; nop; nop; nop;
107	mfc0	t1, $10		/* EntryHi */
108	nop; nop; nop; nop;
109	mfc0	t2, $2		/* EntryLo0 */
110	nop; nop; nop; nop;
111	mfc0	t3, $3		/* EntryLo1 */
112	nop; nop; nop; nop;
113	sw	t0,  0(a1)
114	sw	t1,  4(a1)
115	sw	t2,  8(a1)
116	sw	t3, 12(a1)
117	jr	ra
118	 nop
119	.end	tlb_read
120