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1 | # |
1 | # |
2 | # Copyright (C) 2006 Martin Decky |
2 | # Copyright (C) 2006 Martin Decky |
3 | # All rights reserved. |
3 | # All rights reserved. |
4 | # |
4 | # |
5 | # Redistribution and use in source and binary forms, with or without |
5 | # Redistribution and use in source and binary forms, with or without |
6 | # modification, are permitted provided that the following conditions |
6 | # modification, are permitted provided that the following conditions |
7 | # are met: |
7 | # are met: |
8 | # |
8 | # |
9 | # - Redistributions of source code must retain the above copyright |
9 | # - Redistributions of source code must retain the above copyright |
10 | # notice, this list of conditions and the following disclaimer. |
10 | # notice, this list of conditions and the following disclaimer. |
11 | # - Redistributions in binary form must reproduce the above copyright |
11 | # - Redistributions in binary form must reproduce the above copyright |
12 | # notice, this list of conditions and the following disclaimer in the |
12 | # notice, this list of conditions and the following disclaimer in the |
13 | # documentation and/or other materials provided with the distribution. |
13 | # documentation and/or other materials provided with the distribution. |
14 | # - The name of the author may not be used to endorse or promote products |
14 | # - The name of the author may not be used to endorse or promote products |
15 | # derived from this software without specific prior written permission. |
15 | # derived from this software without specific prior written permission. |
16 | # |
16 | # |
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | # |
27 | # |
28 | 28 | ||
29 | #define INITIAL_STACK 0x0 |
29 | #define INITIAL_STACK 0x0 |
30 | 30 | ||
31 | #define PSTATE_IE_BIT 2 |
31 | #define PSTATE_IE_BIT 2 |
32 | 32 | ||
33 | .register %g2, #scratch |
33 | .register %g2, #scratch |
34 | .register %g3, #scratch |
34 | .register %g3, #scratch |
35 | .register %g6, #scratch |
35 | .register %g6, #scratch |
36 | .register %g7, #scratch |
36 | .register %g7, #scratch |
37 | 37 | ||
38 | .section BOOTSTRAP, "ax" |
38 | .section BOOTSTRAP, "ax" |
39 | 39 | ||
40 | .global start |
40 | .global start |
41 | start: |
41 | start: |
42 | b 1f |
42 | b 1f |
43 | nop |
43 | nop |
44 | 44 | ||
45 | /* |
45 | /* |
46 | * This header forces SILO to load the image at 0x4000. |
46 | * This header forces SILO to load the image at 0x4000. |
47 | * More precisely, SILO will think this is an old version of Linux. |
47 | * More precisely, SILO will think this is an old version of Linux. |
48 | */ |
48 | */ |
49 | .ascii "HdrS" |
49 | .ascii "HdrS" |
50 | .word 0 |
50 | .word 0 |
51 | .half 0 |
51 | .half 0 |
52 | 52 | ||
53 | .align 8 |
53 | .align 8 |
54 | 1: |
54 | 1: |
55 | flushw |
55 | flushw |
56 | 56 | ||
57 | /* |
57 | /* |
58 | * Disable interrupts. |
58 | * Disable interrupts. |
59 | */ |
59 | */ |
60 | rdpr %pstate, %g2 |
60 | rdpr %pstate, %g2 |
61 | and %g2, ~PSTATE_IE_BIT, %g2 ! mask the Interrupt Enable bit |
61 | and %g2, ~PSTATE_IE_BIT, %g2 ! mask the Interrupt Enable bit |
62 | wrpr %g2, 0, %pstate |
62 | wrpr %g2, 0, %pstate |
63 | 63 | ||
64 | # TODO: set initial stack |
64 | # TODO: set initial stack |
65 | 65 | ||
66 | set ofw_cif, %l0 |
66 | set ofw_cif, %l0 |
67 | 67 | ||
68 | call init ! initialize OpenFirmware |
68 | call init ! initialize OpenFirmware |
69 | stx %o4, [%l0] |
69 | stx %o4, [%l0] |
70 | 70 | ||
71 | b bootstrap |
71 | b bootstrap |
72 | nop |
72 | nop |
73 | 73 | ||
74 | 74 | ||
75 |
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75 |
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76 | 76 | ||
77 | 77 | ||
78 | 78 |