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1 | # |
1 | # |
2 | # Copyright (c) 2007 Michal Kebrt |
2 | # Copyright (c) 2007 Michal Kebrt |
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/boot.h> |
29 | #include <arch/asm/boot.h> |
30 | 30 | ||
31 | .text |
31 | .text |
32 | 32 | ||
33 | .global kernel_image_start |
33 | .global kernel_image_start |
34 | .global exc_stack |
34 | .global exc_stack |
35 | .global supervisor_sp |
35 | .global supervisor_sp |
36 | 36 | ||
37 | kernel_image_start: |
37 | kernel_image_start: |
- | 38 | ||
- | 39 | # initialize Stack pointer for exception modes |
|
- | 40 | mrs r4, cpsr |
|
- | 41 | bic r4, r4, #0x1f |
|
38 | 42 | ||
- | 43 | #FIQ Mode |
|
- | 44 | orr r3, r4, #0x11 |
|
- | 45 | msr cpsr_c, r3 |
|
- | 46 | ldr sp, =exc_stack |
|
- | 47 | ||
- | 48 | #IRQ Mode |
|
- | 49 | orr r3, r4, #0x12 |
|
- | 50 | msr cpsr_c, r3 |
|
- | 51 | ldr sp, =exc_stack |
|
- | 52 | ||
- | 53 | #ABORT Mode |
|
- | 54 | orr r3, r4, #0x17 |
|
- | 55 | msr cpsr_c, r3 |
|
- | 56 | ldr sp, =exc_stack |
|
- | 57 | ||
- | 58 | #UNDEFINED Mode |
|
- | 59 | orr r3, r4, #0x1b |
|
- | 60 | msr cpsr_c, r3 |
|
- | 61 | ldr sp, =exc_stack |
|
- | 62 | ||
39 | # switch to supervisor mode |
63 | # switch to supervisor mode |
40 | mrs r3, cpsr |
- | |
41 | bic r3, r3, #0x1f |
- | |
42 | orr r3, r3, #0x13 |
64 | orr r3, r4, #0x13 |
43 | msr cpsr_c, r3 |
65 | msr cpsr_c, r3 |
44 | 66 | ||
45 | ldr sp, =temp_stack |
67 | ldr sp, =temp_stack |
46 | 68 | ||
47 | bl arch_pre_main |
69 | bl arch_pre_main |
48 | 70 | ||
49 | bl main_bsp |
71 | bl main_bsp |
50 | 72 | ||
51 | .space TEMP_STACK_SIZE |
73 | .space TEMP_STACK_SIZE |
52 | temp_stack: |
74 | temp_stack: |
53 | 75 | ||
54 | .space 1024 |
76 | .space 1024 |
55 | exc_stack: |
77 | exc_stack: |
56 | 78 | ||
57 | supervisor_sp: |
79 | supervisor_sp: |
58 | .space 4 |
80 | .space 4 |
59 | 81 |