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1 | # |
1 | # |
2 | # Copyright (C) 2005 Jakub Jermar |
2 | # Copyright (C) 2005 Jakub Jermar |
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 | #include <arch/boot/boot.h> |
29 | #include <arch/boot/boot.h> |
30 | 30 | ||
31 | .register %g2, #scratch |
31 | .register %g2, #scratch |
32 | .register %g3, #scratch |
32 | .register %g3, #scratch |
33 | .register %g6, #scratch |
33 | .register %g6, #scratch |
34 | .register %g7, #scratch |
34 | .register %g7, #scratch |
35 | 35 | ||
36 | .section K_TEXT_START, "ax" |
36 | .section K_TEXT_START, "ax" |
37 | 37 | ||
- | 38 | /* |
|
- | 39 | * Here is where the kernel is passed control. |
|
- | 40 | * The code must be position independent until |
|
- | 41 | * the kernel relocates itself to its VMA. |
|
- | 42 | */ |
|
- | 43 | ||
38 | .global kernel_image_start |
44 | .global kernel_image_start |
39 | kernel_image_start: |
45 | kernel_image_start: |
40 | 0: |
46 | 0: |
41 | b 1f |
47 | b 1f |
42 | nop |
48 | nop |
43 | 49 | ||
44 | # |
50 | /* |
45 | # This header forces SILO to load the kernel at 0x4000. |
51 | * This header forces SILO to load the kernel at 0x4000. |
46 | # More precisely, SILO will think this is an old version of Linux. |
52 | * More precisely, SILO will think this is an old version of Linux. |
47 | # |
53 | */ |
48 | .ascii "HdrS" |
54 | .ascii "HdrS" |
49 | .word 0 |
55 | .word 0 |
50 | .half 0 |
56 | .half 0 |
51 | 57 | ||
52 | .align 8 |
58 | .align 8 |
53 | 59 | ||
54 | 1: |
60 | 1: |
55 | flushw ! flush all but the active register window |
61 | flushw ! flush all but the active register window |
56 | 62 | ||
57 | /* |
63 | /* |
58 | * Prepare to copy the kernel image to 4M. |
64 | * Prepare to copy the kernel image to 4M. |
59 | */ |
65 | */ |
60 | 66 | ||
61 | set LMA, %g1 ! source address |
67 | set LMA, %g1 ! source address |
62 | set VMA, %g2 ! destination address (VMA) |
68 | set VMA, %g2 ! destination address |
63 | set hardcoded_ktext_size, %g3 ! link address of hardcoded_ktext_size |
69 | set hardcoded_ktext_size, %g3 ! link address of hardcoded_ktext_size |
64 | set hardcoded_kdata_size, %g4 ! link address of hardcoded_kdata_size |
70 | set hardcoded_kdata_size, %g4 ! link address of hardcoded_kdata_size |
65 | 71 | ||
66 | sub %g3, %g2, %g3 ! offset of hardcoded_ktext_size from the beginning of the load address |
72 | sub %g3, %g2, %g3 ! offset of hardcoded_ktext_size from the beginning of the load address |
67 | sub %g4, %g2, %g4 ! offset of hardcoded_kdata_size from the beginning of the load address |
73 | sub %g4, %g2, %g4 ! offset of hardcoded_kdata_size from the beginning of the load address |
68 | 74 | ||
69 | ldx [%g3 + %g1], %g3 ! hardcoded_ktext_size -> %g3 |
75 | ldx [%g3 + %g1], %g3 ! hardcoded_ktext_size -> %g3 |
70 | ldx [%g4 + %g1], %g4 ! hardcoded_kdata_size -> %g4 |
76 | ldx [%g4 + %g1], %g4 ! hardcoded_kdata_size -> %g4 |
71 | 77 | ||
72 | add %g3, %g4, %g3 ! size of kernel text and data |
78 | add %g3, %g4, %g3 ! size of kernel text and data |
73 | 79 | ||
74 | /* |
80 | /* |
75 | * Start copying the kernel from higher addresses towards lower addresses. |
81 | * Start copying the kernel from higher addresses towards lower addresses. |
76 | */ |
82 | */ |
77 | 83 | ||
78 | 2: dec %g3 |
84 | 2: dec %g3 |
79 | ldub [%g1 + %g3], %g4 |
85 | ldub [%g1 + %g3], %g4 |
80 | stb %g4, [%g2 + %g3] |
86 | stb %g4, [%g2 + %g3] |
81 | cmp %g3, 0 |
87 | cmp %g3, 0 |
82 | bnz 2b |
88 | bnz 2b |
83 | nop |
89 | nop |
84 | 90 | ||
85 | set relocated, %g1 |
91 | set relocated, %g1 |
86 | jmp %g1 |
92 | jmp %g1 |
87 | nop |
93 | nop |
88 | 94 | ||
89 | relocated: |
95 | relocated: |
90 | set ofw, %l0 |
96 | set ofw, %l0 |
91 | 97 | ||
92 | call ofw_init |
98 | call ofw_init |
93 | stx %o4, [%l0] |
99 | stx %o4, [%l0] |
94 | 100 | ||
95 | call main_bsp |
101 | call main_bsp |
96 | nop |
102 | nop |
97 | 103 | ||
98 | /* Not reached. */ |
104 | /* Not reached. */ |
99 | 105 | ||
100 | 2: |
106 | 2: |
101 | b 2b |
107 | b 2b |
102 | nop |
108 | nop |
103 | 109 | ||
104 | 110 | ||
105 |
|
111 |
|
106 | 112 | ||
107 | 113 | ||
108 | 114 |