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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/asm/regname.h> |
29 | #include <arch/asm/regname.h> |
30 | #include <arch/asm/spr.h> |
30 | #include <arch/asm/spr.h> |
31 | 31 | ||
32 | .section K_TEXT_START |
32 | .section K_TEXT_START |
33 | 33 | ||
34 | .global kernel_image_start |
34 | .global kernel_image_start |
35 | 35 | ||
36 | .org 0x0 |
- | |
37 | /* 256 bytes of some data */ |
- | |
38 | /* exception table - must use 'ba' instructions for branches, |
- | |
39 | * because it is elsewhere than the linker thinks |
- | |
40 | */ |
- | |
41 | .space 4096 |
- | |
42 | - | ||
43 | kernel_image_start: |
36 | kernel_image_start: |
44 | /* Initialize OFW, might be needed before relocate_kernel? */ |
- | |
45 | lis r4, ofw@ha |
- | |
46 | addi r4, r4, ofw@l |
- | |
47 | stw r5, 0(r4) |
- | |
48 | - | ||
49 | bl ofw_init |
- | |
50 | bl preboot_read_config |
- | |
51 | - | ||
52 | bl relocate_kernel |
- | |
53 | __after_reloc: |
- | |
54 | /* Set stack to some more meaningful value */ |
- | |
55 | /* TODO: This is hardcoded for PearPC, must be changed later */ |
- | |
56 | lis r1, 0x70 |
- | |
57 | b main_bsp |
37 | b main_bsp |
58 | - | ||
59 | relocate_kernel: |
- | |
60 | /* TODO: We _know_ that pearpc loads it to 8MB, and |
- | |
61 | * but it should be really generic |
- | |
62 | */ |
- | |
63 | lis r4, 0x80 /* r4 is where data was loaded - 8MB */ |
- | |
64 | - | ||
65 | bl to_real_mode |
- | |
66 | /* Now we are in real mode, copy first block and jump to it, |
- | |
67 | * we are running in the loaded kernel now |
- | |
68 | * We still have in r3 physical load kernel address |
- | |
69 | */ |
- | |
70 | - | ||
71 | b __after_reloc /* We know in pearpc we are ok, so return, |
- | |
72 | * otherwise we should relocate kernel |
- | |
73 | * here |
- | |
74 | */ |
- | |
75 | - | ||
76 | - | ||
77 | - | ||
78 | - | ||
79 | /* Turn off page translation |
- | |
80 | * - assume that physical-loaded address is in r4 |
- | |
81 | */ |
- | |
82 | to_real_mode: |
- | |
83 | mflr r0 |
- | |
84 | - | ||
85 | lis r5, ktext_start@ha // Expected start of kernel |
- | |
86 | addi r5, r5, ktext_start@l |
- | |
87 | - | ||
88 | add r0, r4, r0 |
- | |
89 | sub r0, r0, r5 // r0 now contains physical return address |
- | |
90 | - | ||
91 | mfmsr r3 |
- | |
92 | andis. r3, r3, (~MSR_DR | MSR_IR) >> 16 |
- | |
93 | mtspr SPRN_SRR0, r0 |
- | |
94 | mtspr SPRN_SRR1, r3 |
- | |
95 | sync // Really needed? RFI should do it as well? |
- | |
96 | RFI |
- | |
97 | - | ||
98 | 38 |