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1 | # |
1 | # |
2 | # Copyright (C) 2001-2004 Jakub Jermar |
2 | # Copyright (C) 2001-2004 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 | .section K_TEXT_START |
29 | .section K_TEXT_START |
30 | .global kernel_image_start |
30 | .global kernel_image_start |
31 | 31 | ||
32 | .code16 |
32 | .code16 |
33 | # |
33 | # |
34 | # This is where we require any SPARTAN-kernel-compatible boot loader |
34 | # This is where we require any SPARTAN-kernel-compatible boot loader |
35 | # to pass control in real mode. |
35 | # to pass control in real mode. |
36 | # |
36 | # |
37 | # Protected mode tables are statically initialised during compile |
37 | # Protected mode tables are statically initialised during compile |
38 | # time. So we can just load the respective table registers and |
38 | # time. So we can just load the respective table registers and |
39 | # switch to protected mode. |
39 | # switch to protected mode. |
40 | # |
40 | # |
41 | kernel_image_start: |
41 | kernel_image_start: |
- | 42 | call memmap_arch_init |
|
42 | cli |
43 | cli |
43 | xorw %ax,%ax |
44 | xorw %ax,%ax |
44 | movw %ax,%ds |
45 | movw %ax,%ds |
45 | lgdt gdtr |
46 | lgdt gdtr |
46 | movl %cr0,%eax |
47 | movl %cr0,%eax |
47 | orl $0x1,%eax |
48 | orl $0x1,%eax |
48 | movl %eax,%cr0 |
49 | movl %eax,%cr0 |
49 | jmp 0f |
50 | jmp 0f |
50 | 0: |
51 | 0: |
51 | movw $16,%ax |
52 | movw $16,%ax |
52 | movw %ax,%es |
53 | movw %ax,%es |
53 | movw %ax,%gs |
54 | movw %ax,%gs |
54 | movw %ax,%fs |
55 | movw %ax,%fs |
55 | movw %ax,%ds # kernel data + stack |
56 | movw %ax,%ds # kernel data + stack |
56 | movw %ax,%ss |
57 | movw %ax,%ss |
57 | movl $0x7c00,%esp |
58 | movl $0x7c00,%esp |
58 | jmpl $8,$meeting_point |
59 | jmpl $8,$meeting_point |
59 | meeting_point: |
60 | meeting_point: |
60 | .code32 |
61 | .code32 |
61 | 62 | ||
62 | lidt idtr |
63 | lidt idtr |
63 | 64 | ||
64 | call main_bsp # never returns |
65 | call main_bsp # never returns |
65 | 66 | ||
66 | 67 | ||
67 | cli |
68 | cli |
68 | hlt |
69 | hlt |
69 | 70 | ||
70 | 71 | ||
71 |
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72 |
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72 | 73 | ||
73 | 74 | ||
74 | 75 |