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1 | # |
1 | # |
2 | # Copyright (c) 2006 Martin Decky |
2 | # Copyright (c) 2006 Martin Decky |
3 | # Copyright (c) 2006 Jakub Jermar |
3 | # Copyright (c) 2006 Jakub Jermar |
4 | # All rights reserved. |
4 | # All rights reserved. |
5 | # |
5 | # |
6 | # Redistribution and use in source and binary forms, with or without |
6 | # Redistribution and use in source and binary forms, with or without |
7 | # modification, are permitted provided that the following conditions |
7 | # modification, are permitted provided that the following conditions |
8 | # are met: |
8 | # are met: |
9 | # |
9 | # |
10 | # - Redistributions of source code must retain the above copyright |
10 | # - Redistributions of source code must retain the above copyright |
11 | # notice, this list of conditions and the following disclaimer. |
11 | # notice, this list of conditions and the following disclaimer. |
12 | # - Redistributions in binary form must reproduce the above copyright |
12 | # - Redistributions in binary form must reproduce the above copyright |
13 | # notice, this list of conditions and the following disclaimer in the |
13 | # notice, this list of conditions and the following disclaimer in the |
14 | # documentation and/or other materials provided with the distribution. |
14 | # documentation and/or other materials provided with the distribution. |
15 | # - The name of the author may not be used to endorse or promote products |
15 | # - The name of the author may not be used to endorse or promote products |
16 | # derived from this software without specific prior written permission. |
16 | # derived from this software without specific prior written permission. |
17 | # |
17 | # |
18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
26 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 | # |
28 | # |
29 | 29 | ||
30 | #include <stack.h> |
30 | #include <stack.h> |
31 | #include <register.h> |
31 | #include <register.h> |
32 | 32 | ||
33 | #define INITIAL_STACK_SIZE 8192 |
33 | #define INITIAL_STACK_SIZE 8192 |
34 | 34 | ||
35 | #define NWINDOWS 8 |
35 | #define NWINDOWS 8 |
36 | 36 | ||
37 | .register %g2, #scratch |
37 | .register %g2, #scratch |
38 | .register %g3, #scratch |
38 | .register %g3, #scratch |
39 | .register %g6, #scratch |
39 | .register %g6, #scratch |
40 | .register %g7, #scratch |
40 | .register %g7, #scratch |
41 | 41 | ||
42 | .section BOOTSTRAP, "ax" |
42 | .section BOOTSTRAP, "ax" |
43 | 43 | ||
44 | .global start |
44 | .global start |
45 | start: |
45 | start: |
46 | b 1f |
46 | b 1f |
47 | nop |
47 | nop |
48 | 48 | ||
49 | /* |
49 | /* |
50 | * This header forces SILO to load the image at 0x4000. |
50 | * This header forces SILO to load the image at 0x4000. |
51 | * More precisely, SILO will think this is an old version of Linux. |
51 | * More precisely, SILO will think this is an old version of Linux. |
52 | */ |
52 | */ |
53 | .ascii "HdrS" |
53 | .ascii "HdrS" |
54 | .word 0 |
54 | .word 0 |
55 | .half 0 |
55 | .half 0 |
56 | 56 | ||
57 | .align 8 |
57 | .align 8 |
58 | 1: |
58 | 1: |
59 | /* |
59 | /* |
60 | * Disable interrupts and disable address masking. |
60 | * Disable interrupts and disable address masking. |
61 | */ |
61 | */ |
62 | wrpr %g0, PSTATE_PRIV_BIT, %pstate |
62 | wrpr %g0, PSTATE_PRIV_BIT, %pstate |
63 | 63 | ||
64 | wrpr %g0, NWINDOWS - 2, %cansave ! set maximum saveable windows |
64 | wrpr %g0, NWINDOWS - 2, %cansave ! set maximum saveable windows |
65 | wrpr %g0, 0, %canrestore ! get rid of windows we will never need again |
65 | wrpr %g0, 0, %canrestore ! get rid of windows we will never need again |
66 | wrpr %g0, 0, %otherwin ! make sure the window state is consistent |
66 | wrpr %g0, 0, %otherwin ! make sure the window state is consistent |
67 | wrpr %g0, NWINDOWS - 1, %cleanwin ! prevent needless clean_window traps for kernel |
67 | wrpr %g0, NWINDOWS - 1, %cleanwin ! prevent needless clean_window traps for kernel |
68 | 68 | ||
69 | set initial_stack_top, %sp |
69 | set initial_stack_top, %sp |
70 | add %sp, -STACK_BIAS, %sp |
70 | add %sp, -STACK_BIAS, %sp |
71 | 71 | ||
72 | set ofw_cif, %l0 |
72 | set ofw_cif, %l0 |
73 | 73 | ||
74 | call ofw_init ! initialize OpenFirmware |
74 | call ofw_init ! initialize OpenFirmware |
75 | stx %o4, [%l0] |
75 | stx %o4, [%l0] |
76 | 76 | ||
77 | b bootstrap |
77 | b bootstrap |
78 | nop |
78 | nop |
79 | 79 | ||
80 | .align STACK_ALIGNMENT |
80 | .align STACK_ALIGNMENT |
81 | initial_stack: |
81 | initial_stack: |
82 | .space INITIAL_STACK_SIZE |
82 | .space INITIAL_STACK_SIZE |
83 | initial_stack_top: |
83 | initial_stack_top: |
84 | .space STACK_WINDOW_SAVE_AREA_SIZE |
84 | .space STACK_WINDOW_SAVE_AREA_SIZE |
85 | 85 |