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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 | cli |
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- | 43 | xorw %ax,%ax |
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- | 44 | movw %ax,%ds |
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- | 45 | movw %ax,%ss # initialize stack segment register |
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- | 46 | movl $0x7c00,%esp # initialize stack pointer |
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- | 47 | ||
- | 48 | call memmap_arch_init |
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- | 49 | ||
- | 50 | mov $0x80000000, %eax |
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- | 51 | cpuid |
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- | 52 | cmp $0x80000000, %eax # any function > 80000000h? |
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- | 53 | jbe no_long_mode |
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- | 54 | mov $0x80000001, %eax # Extended function code 80000001 |
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- | 55 | cpuid |
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- | 56 | bt $29, %edx # Test if long mode is supported. |
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- | 57 | jnc no_long_mode |
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42 | 58 | ||
- | 59 | # Fill out GDTR.base, IDTR.base |
|
43 | meeting_point: |
60 | leal gdtr, %eax |
- | 61 | movl gdt_addr, %ebx |
|
44 | .code32 |
62 | movl %ebx, 2(%eax) |
45 | 63 | ||
- | 64 | movl idt_addr, %ebx |
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- | 65 | leal idtr, %eax |
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- | 66 | movl %ebx, 2(%eax) |
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46 | 67 | ||
- | 68 | # Load gdtr, idtr |
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- | 69 | lgdt gdtr |
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- | 70 | lidt idtr |
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- | 71 | ||
- | 72 | mov $1, %eax # Enable protected mode (CR0.PE = 1) |
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47 | .section K_DATA_START |
73 | mov %eax, %cr0 |
48 | 74 | ||
- | 75 | jmpl $8, $now_in_prot |
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- | 76 | ||
- | 77 | now_in_prot: |
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- | 78 | ||
- | 79 | ||
- | 80 | no_long_mode: |
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- | 81 | 1: |
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- | 82 | jmp 1b |
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- | 83 | ||
- | 84 | ||
- | 85 | .section K_DATA_START |
|
49 | .align 4096 |
86 | .align 4096 |
50 | page_directory: |
87 | page_directory: |
51 | .space 4096, 0 |
88 | .space 4096, 0 |
- | 89 | ||
- | 90 | gdt_addr: |
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- | 91 | .quad gdt + 0x80000000 |
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- | 92 | idt_addr: |
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- | 93 | .quad idt + 0x80000000 |
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52 | 94 |