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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 |
|
| - | 32 | ||
| 31 | .register %g2, #scratch |
33 | .register %g2, #scratch |
| 32 | .register %g3, #scratch |
34 | .register %g3, #scratch |
| 33 | .register %g6, #scratch |
35 | .register %g6, #scratch |
| 34 | .register %g7, #scratch |
36 | .register %g7, #scratch |
| 35 | 37 | ||
| 36 | .section BOOTSTRAP, "ax" |
38 | .section BOOTSTRAP, "ax" |
| 37 | 39 | ||
| 38 | .global start |
40 | .global start |
| 39 | start: |
41 | start: |
| 40 | b 1f |
42 | b 1f |
| 41 | nop |
43 | nop |
| 42 | 44 | ||
| 43 | /* |
45 | /* |
| 44 | * This header forces SILO to load the image at 0x4000. |
46 | * This header forces SILO to load the image at 0x4000. |
| 45 | * 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. |
| 46 | */ |
48 | */ |
| 47 | .ascii "HdrS" |
49 | .ascii "HdrS" |
| 48 | .word 0 |
50 | .word 0 |
| 49 | .half 0 |
51 | .half 0 |
| 50 | 52 | ||
| 51 | .align 8 |
53 | .align 8 |
| 52 | 1: |
54 | 1: |
| 53 | flushw |
55 | flushw |
| 54 | 56 | ||
| - | 57 | /* |
|
| - | 58 | * Disable interrupts. |
|
| - | 59 | */ |
|
| - | 60 | rdpr %pstate, %g2 |
|
| - | 61 | and %g2, ~PSTATE_IE_BIT, %g2 ! mask the Interrupt Enable bit |
|
| - | 62 | wrpr %g2, 0, %pstate |
|
| - | 63 | ||
| 55 | # TODO: set initial stack |
64 | # TODO: set initial stack |
| 56 | 65 | ||
| 57 | set ofw, %l0 |
66 | set ofw_cif, %l0 |
| 58 | 67 | ||
| 59 | call init ! initialize OpenFirmware |
68 | call init ! initialize OpenFirmware |
| 60 | stx %o4, [%l0] |
69 | stx %o4, [%l0] |
| 61 | 70 | ||
| 62 | b bootstrap |
71 | b bootstrap |
| 63 | nop |
72 | nop |
| 64 | 73 | ||