1/* $NetBSD: start.S,v 1.2 2003/02/07 17:52:08 cgd Exp $ */
2
3/*
4 * Copyright 2000, 2001
5 * Broadcom Corporation. All rights reserved.
6 *
7 * This software is furnished under license and may be used and copied only
8 * in accordance with the following terms and conditions.  Subject to these
9 * conditions, you may download, copy, install, use, modify and distribute
10 * modified or unmodified copies of this software in source and/or binary
11 * form. No title or ownership is transferred hereby.
12 *
13 * 1) Any source code used, modified or distributed must reproduce and
14 *    retain this copyright notice and list of conditions as they appear in
15 *    the source file.
16 *
17 * 2) No right is granted to use any trade name, trademark, or logo of
18 *    Broadcom Corporation.  The "Broadcom Corporation" name may not be
19 *    used to endorse or promote products derived from this software
20 *    without the prior written permission of Broadcom Corporation.
21 *
22 * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED
23 *    WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF
24 *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
25 *    NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE
26 *    FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE
27 *    LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 *    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 *    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 *    BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 *    WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
32 *    OR OTHERWISE), EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#define STACK_SIZE 8192
36
37#include "include/asm.h"
38
39
40            .bss
41
42            .comm stack_bottom,STACK_SIZE
43
44          .text
45
46LEAF(start)
47
48          la        gp,_gp
49
50          la        sp,stack_bottom+STACK_SIZE-32
51
52/*
53 * On entry: a0 = the firmware handle, a2 = firmware's
54 * for secondary bootstraps, a1 is the booted device handle
55 * Don't trash a0..a3 until main is called!
56 */
57
58
59#if defined(STANDALONE_PROGRAM)
60          /*
61           * This should not be used anywhere.
62           */
63
64#error "don't do this."
65
66#else /* defined(STANDALONE_PROGRAM) */
67
68#if !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK)
69
70        la      sp,start
71
72#endif /* !defined(PRIMARY_BOOTBLOCK) && !defined(UNIFIED_BOOTBLOCK) */
73
74#endif /* defined(STANDALONE_PROGRAM) */
75
76/*
77 * Zero BSS
78 */
79
80          la        t0,_edata           /* t0 = address */
81          la        t1,_end
82
831:        sw        zero,0(t0)
84          sw        zero,4(t0)
85          sw        zero,8(t0)
86          sw        zero,16(t0)
87          add       t0,16
88          ble       t0,t1,1b
89
90
91/*
92 * Run the main program.
93 */
94
95          jal     main                            /* transfer to C */
96
97XLEAF(halt)
98          li        t0,0xBFC00000                 /* transfer back to firmware */
99          j         t0
100END(start)
101
102
103
104LEAF(__main)
105          j         ra
106END(__main)
107
108LEAF(_rtt)
109          li        t0,0xBFC00000
110          j         t0
111END(_rtt)
112