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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 |
42 | cli |
43 | xorw %ax,%ax |
43 | xorw %ax,%ax |
44 | movw %ax,%ds |
44 | movw %ax,%ds |
45 | movw %ax,%ss # initialize stack segment register |
45 | movw %ax,%ss # initialize stack segment register |
46 | movl $0x7c00,%esp # initialize stack pointer |
46 | movl $0x7c00,%esp # initialize stack pointer |
47 | 47 | ||
48 | call memmap_arch_init |
48 | call memmap_arch_init |
49 | 49 | ||
- | 50 | lgdt gdtr # initialize Global Descriptor Table register |
|
- | 51 | lidt idtr # initialize Interrupt Descriptor Table register |
|
50 | lgdt gdtr |
52 | |
51 | movl %cr0,%eax |
53 | movl %cr0,%eax |
52 | orl $0x1,%eax |
54 | orl $0x1,%eax |
53 | movl %eax,%cr0 |
55 | movl %eax,%cr0 # switch to protected mode |
54 | jmpl $8,$meeting_point |
56 | jmpl $8,$meeting_point |
55 | meeting_point: |
57 | meeting_point: |
56 | .code32 |
58 | .code32 |
57 | 59 | ||
58 | movw $16,%ax |
60 | movw $16,%ax |
59 | movw %ax,%es |
61 | movw %ax,%es |
60 | movw %ax,%gs |
62 | movw %ax,%gs |
61 | movw %ax,%fs |
63 | movw %ax,%fs |
62 | movw %ax,%ds # kernel data + stack |
64 | movw %ax,%ds # kernel data + stack |
63 | movw %ax,%ss |
65 | movw %ax,%ss |
64 | 66 | ||
65 | lidt idtr |
- | |
66 | - | ||
67 | call map_kernel |
67 | call map_kernel # map kernel and turn paging on |
68 | 68 | ||
69 | movl $_hardcoded_ktext_size, hardcoded_ktext_size |
69 | movl $_hardcoded_ktext_size, hardcoded_ktext_size |
70 | movl $_hardcoded_kdata_size, hardcoded_kdata_size |
70 | movl $_hardcoded_kdata_size, hardcoded_kdata_size |
71 | movl $_hardcoded_load_address, hardcoded_load_address |
71 | movl $_hardcoded_load_address, hardcoded_load_address |
72 | 72 | ||
73 | call main_bsp # never returns |
73 | call main_bsp # never returns |
74 | 74 | ||
75 | cli |
75 | cli |
76 | hlt |
76 | hlt |
77 | 77 | ||
78 | .global map_kernel |
78 | .global map_kernel |
79 | map_kernel: |
79 | map_kernel: |
80 | # |
80 | # |
81 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
81 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
82 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
82 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
83 | # |
83 | # |
84 | movl %cr4, %ecx |
84 | movl %cr4, %ecx |
85 | orl $(1<<4), %ecx |
85 | orl $(1<<4), %ecx |
86 | movl %ecx, %cr4 # turn PSE on |
86 | movl %ecx, %cr4 # turn PSE on |
87 | 87 | ||
88 | movl $((1<<7)|(1<<0)), %eax |
88 | movl $((1<<7)|(1<<0)), %eax |
89 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
89 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
90 | 90 | ||
91 | movl $(page_directory+(4096/2)), %edx |
91 | movl $(page_directory+(4096/2)), %edx |
92 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
92 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
93 | 93 | ||
94 | leal page_directory, %eax |
94 | leal page_directory, %eax |
95 | movl %eax, %cr3 |
95 | movl %eax, %cr3 |
96 | 96 | ||
97 | # turn on paging |
97 | # turn paging on |
98 | movl %cr0, %ebx |
98 | movl %cr0, %ebx |
99 | orl $(1<<31), %ebx |
99 | orl $(1<<31), %ebx |
100 | movl %ebx, %cr0 |
100 | movl %ebx, %cr0 |
101 | ret |
101 | ret |
102 | 102 | ||
103 | 103 | ||
104 | .section K_DATA_START |
104 | .section K_DATA_START |
105 | 105 | ||
106 | .align 4096 |
106 | .align 4096 |
107 | page_directory: |
107 | page_directory: |
108 | .space 4096, 0 |
108 | .space 4096, 0 |
109 | 109 |