1/*        $NetBSD: boot.S,v 1.1 2006/09/01 21:26:18 uwe Exp $         */
2
3/*-
4 * Copyright (c) 2005 NONAKA Kimihiro
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <machine/asm.h>
30#include <sys/bootblock.h>
31
32ENTRY(boot_start)
33          bra       boot_start1
34           nop
35          .balign 4
36ENTRY(boot_magic)
37          .long     LANDISK_BOOT_MAGIC_2
38ENTRY(boot_params)
39          .long     boot_start1 - boot_params
40#include <boot_params.S>
41
42          . = boot_start + 0x80
43boot_start1:
44          mov       r4, r0
45          add       #-4, r0
46          mov.l     @(0, r0), r0
47          mov.l     .L.boot_magic1, r1
48          cmp/eq    r0, r1
49          bf        2f
50          mov       r4, r0
51          mov.l     .L.boot_params_size, r3
52          mov.l     @r0, r2
53          mov.l     .L.boot_params, r1
54          cmp/hi    r3, r2
55          bf        1f
56          mov       r3, r2
571:        mov.b     @r0+, r3
58          mov.b     r3, @r1
59          dt        r2
60          bf/s      1b
61           add      #1, r1
622:
63          mov.l     .L._end, r0                   /* zero bss */
64          mov.l     .L.__bss_start, r1
65          sub       r1, r0
66          shlr2     r0                            /* _end and __bss_start are aligned */
67          mov       #0, r2
681:        mov.l     r2, @r1
69          dt        r0
70          bf/s      1b
71           add      #4, r1
72
73          mov.l     .L.boot2, r0
74          jsr       @r0
75           mov      r5, r4
76
77boot_fail:
78          mov       r0, r1
79          mova      .L.errtxt, r0
80          mov       r0, r4
81          mov       #32, r0
82          trapa     #0x3f
83          mov       r1, r4
84          mov       #32, r0
85          trapa     #0x3f
86          mova      .L.crlf, r0
87          mov       r0, r4
88          mov       #32, r0
89          trapa     #0x3f
9099:       bra       99b
91           nop
92
93
94ENTRY(halt)
95          mova      .L.pwrctl, r0
96          mov       #1, r1
97          mov.b     @r1, r0
98          rts
99           nop
100
101ENTRY(reboot)
102ENTRY(_rtt)
103          mov       #1, r4                        /* reboot */
104          mov       #11, r0
105          trapa     #0x3f
106          mov.l     .L.start, r0
107          jmp       @r0
108           nop
109
110
111        .align  2
112.L.boot_magic1:
113          .long     LANDISK_BOOT_MAGIC_1
114.L.boot_params:
115          .long     boot_params
116.L.boot_params_size:
117          .long     boot_start1 - boot_params
118.L._end:
119          .long   _end
120.L.__bss_start:
121          .long   __bss_start
122.L.boot2:
123          .long   _C_LABEL(boot2)
124.L.start:
125          .long     0xc0000000
126.L.pwrctl:
127          .long     0xb0000003
128
129          .align    2
130.L.errtxt:          .asciz  "Boot2 failed: "
131          .align    2
132.L.crlf:  .asciz  "\r\n"
133