Rev 216 | Rev 232 | Go to most recent revision | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed
Rev 216 | Rev 222 | ||
---|---|---|---|
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 | #include <arch/boot/boot.h> |
|
- | 30 | ||
29 | .section K_TEXT_START |
31 | .section K_TEXT_START |
30 | .global kernel_image_start |
32 | .global kernel_image_start |
31 | 33 | ||
32 | .code16 |
34 | .code16 |
33 | # |
35 | # |
34 | # This is where we require any SPARTAN-kernel-compatible boot loader |
36 | # This is where we require any SPARTAN-kernel-compatible boot loader |
35 | # to pass control in real mode. |
37 | # to pass control in real mode. |
36 | # |
38 | # |
37 | # Protected mode tables are statically initialised during compile |
39 | # Protected mode tables are statically initialised during compile |
38 | # time. So we can just load the respective table registers and |
40 | # time. So we can just load the respective table registers and |
39 | # switch to protected mode. |
41 | # switch to protected mode. |
40 | # |
42 | # |
41 | kernel_image_start: |
43 | kernel_image_start: |
42 | cli |
44 | cli |
43 | xorw %ax,%ax |
45 | xorw %ax,%ax |
44 | movw %ax,%ds |
46 | movw %ax,%ds |
45 | movw %ax,%ss # initialize stack segment register |
47 | movw %ax,%ss # initialize stack segment register |
46 | movl $0x7c00,%esp # initialize stack pointer |
48 | movl $0x7c00,%esp # initialize stack pointer |
47 | 49 | ||
48 | call memmap_arch_init |
50 | call memmap_arch_init |
49 | 51 | ||
50 | lgdt gdtr # initialize Global Descriptor Table register |
52 | lgdt gdtr # initialize Global Descriptor Table register |
51 | lidt idtr # initialize Interrupt Descriptor Table register |
53 | lidt idtr # initialize Interrupt Descriptor Table register |
52 | 54 | ||
53 | movl %cr0,%eax |
55 | movl %cr0,%eax |
54 | orl $0x1,%eax |
56 | orl $0x1,%eax |
55 | movl %eax,%cr0 # switch to protected mode |
57 | movl %eax,%cr0 # switch to protected mode |
56 | jmpl $8,$meeting_point |
58 | jmpl $8,$meeting_point |
57 | meeting_point: |
59 | |
58 | .code32 |
60 | .code32 |
- | 61 | .align 4 |
|
- | 62 | multiboot_header: |
|
- | 63 | .long MULTIBOOT_HEADER_MAGIC |
|
- | 64 | .long MULTIBOOT_HEADER_FLAGS |
|
- | 65 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
|
- | 66 | .long multiboot_header |
|
- | 67 | .long unmapped_ktext_start |
|
- | 68 | .long 0 |
|
- | 69 | .long 0 |
|
- | 70 | .long multiboot_image_start |
|
- | 71 | ||
- | 72 | multiboot_image_start: |
|
- | 73 | movl $0x7c00, %esp # initialize stack pointer |
|
- | 74 | ||
- | 75 | lgdt gdtr |
|
- | 76 | lidt idtr |
|
59 | 77 | ||
- | 78 | meeting_point: |
|
60 | movw $16,%ax |
79 | movw $16,%ax |
61 | movw %ax,%es |
80 | movw %ax,%es |
62 | movw %ax,%gs |
81 | movw %ax,%gs |
63 | movw %ax,%fs |
82 | movw %ax,%fs |
64 | movw %ax,%ds # kernel data + stack |
83 | movw %ax,%ds # kernel data + stack |
65 | movw %ax,%ss |
84 | movw %ax,%ss |
66 | 85 | ||
67 | call map_kernel # map kernel and turn paging on |
86 | call map_kernel # map kernel and turn paging on |
68 | 87 | ||
69 | call main_bsp # never returns |
88 | call main_bsp # never returns |
70 | 89 | ||
71 | cli |
90 | cli |
72 | hlt |
91 | hlt |
73 | 92 | ||
74 | .global map_kernel |
93 | .global map_kernel |
75 | map_kernel: |
94 | map_kernel: |
76 | # |
95 | # |
77 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
96 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
78 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
97 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
79 | # |
98 | # |
80 | movl %cr4, %ecx |
99 | movl %cr4, %ecx |
81 | orl $(1<<4), %ecx |
100 | orl $(1<<4), %ecx |
82 | movl %ecx, %cr4 # turn PSE on |
101 | movl %ecx, %cr4 # turn PSE on |
83 | 102 | ||
84 | movl $((1<<7)|(1<<0)), %eax |
103 | movl $((1<<7)|(1<<0)), %eax |
85 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
104 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
86 | 105 | ||
87 | movl $(page_directory+(4096/2)), %edx |
106 | movl $(page_directory+(4096/2)), %edx |
88 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
107 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
89 | 108 | ||
90 | leal page_directory, %eax |
109 | leal page_directory, %eax |
91 | movl %eax, %cr3 |
110 | movl %eax, %cr3 |
92 | 111 | ||
93 | # turn paging on |
112 | # turn paging on |
94 | movl %cr0, %ebx |
113 | movl %cr0, %ebx |
95 | orl $(1<<31), %ebx |
114 | orl $(1<<31), %ebx |
96 | movl %ebx, %cr0 |
115 | movl %ebx, %cr0 |
97 | ret |
116 | ret |
98 | 117 | ||
99 | 118 | ||
100 | .section K_DATA_START |
119 | .section K_DATA_START |
101 | 120 | ||
102 | .align 4096 |
121 | .align 4096 |
103 | page_directory: |
122 | page_directory: |
104 | .space 4096, 0 |
123 | .space 4096, 0 |
105 | 124 |