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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 | #include <arch/boot/boot.h> |
29 | #include <arch/boot/boot.h> |
30 | 30 | ||
31 | .section K_TEXT_START |
31 | .section K_TEXT_START |
32 | .global kernel_image_start |
32 | .global kernel_image_start |
33 | 33 | ||
34 | .code16 |
34 | .code16 |
35 | # |
35 | # |
36 | # This is where we require any SPARTAN-kernel-compatible boot loader |
36 | # This is where we require any SPARTAN-kernel-compatible boot loader |
37 | # to pass control in real mode. |
37 | # to pass control in real mode. |
38 | # |
38 | # |
39 | # Protected mode tables are statically initialised during compile |
39 | # Protected mode tables are statically initialised during compile |
40 | # time. So we can just load the respective table registers and |
40 | # time. So we can just load the respective table registers and |
41 | # switch to protected mode. |
41 | # switch to protected mode. |
42 | # |
42 | # |
43 | kernel_image_start: |
43 | kernel_image_start: |
44 | cli |
44 | cli |
45 | xorw %ax,%ax |
45 | xorw %ax, %ax |
46 | movw %ax,%ds |
46 | movw %ax, %ds |
47 | movw %ax,%ss # initialize stack segment register |
47 | movw %ax, %ss # initialize stack segment register |
48 | movl $0x7c00,%esp # initialize stack pointer |
48 | movl $0x7c00, %esp # initialize stack pointer |
49 | 49 | ||
50 | call memmap_arch_init |
50 | call memmap_arch_init |
51 | 51 | ||
52 | lgdt gdtr # initialize Global Descriptor Table register |
52 | lgdt gdtr # initialize Global Descriptor Table register |
53 | 53 | ||
54 | movl %cr0,%eax |
54 | movl %cr0, %eax |
55 | orl $0x1,%eax |
55 | orl $0x1, %eax |
56 | movl %eax,%cr0 # switch to protected mode |
56 | movl %eax, %cr0 # switch to protected mode |
- | 57 | ||
57 | jmpl $8,$meeting_point |
58 | jmpl $8, $boot_image_start |
58 | 59 | ||
59 | .code32 |
60 | .code32 |
60 | .align 4 |
61 | .align 4 |
61 | multiboot_header: |
62 | multiboot_header: |
62 | .long MULTIBOOT_HEADER_MAGIC |
63 | .long MULTIBOOT_HEADER_MAGIC |
63 | .long MULTIBOOT_HEADER_FLAGS |
64 | .long MULTIBOOT_HEADER_FLAGS |
64 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
65 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
65 | .long multiboot_header |
66 | .long multiboot_header + BOOT_OFFSET |
66 | .long unmapped_ktext_start |
67 | .long unmapped_ktext_start + BOOT_OFFSET |
67 | .long 0 |
68 | .long 0 |
68 | .long 0 |
69 | .long 0 |
69 | .long multiboot_image_start |
70 | .long multiboot_image_start + BOOT_OFFSET |
- | 71 | ||
- | 72 | boot_image_start: |
|
- | 73 | movw $16, %ax |
|
- | 74 | movw %ax, %es |
|
- | 75 | movw %ax, %gs |
|
- | 76 | movw %ax, %fs |
|
- | 77 | movw %ax, %ds # kernel data + stack |
|
- | 78 | movw %ax, %ss |
|
- | 79 | ||
- | 80 | call map_kernel # map kernel and turn paging on |
|
- | 81 | ||
- | 82 | movb $0xd1, %al # enable A20 using the keyboard controller |
|
- | 83 | outb %al, $0x64 |
|
- | 84 | movb $0xdf, %al |
|
- | 85 | outb %al, $0x60 |
|
- | 86 | ||
- | 87 | movl $0x8000, %esi |
|
- | 88 | movl $0x8000 + BOOT_OFFSET, %edi |
|
- | 89 | movl $_hardcoded_kernel_size, %ecx |
|
- | 90 | cld |
|
- | 91 | rep movsb |
|
- | 92 | ||
- | 93 | jmp protected |
|
70 | 94 | ||
71 | multiboot_image_start: |
95 | multiboot_image_start: |
72 | movl $0x7c00, %esp # initialize stack pointer |
96 | movl $0x7c00, %esp # initialize stack pointer |
73 | 97 | ||
74 | lgdt gdtr |
98 | lgdt gdtr |
75 | 99 | ||
76 | meeting_point: |
- | |
77 | movw $16,%ax |
100 | movw $16, %ax |
78 | movw %ax,%es |
101 | movw %ax, %es |
79 | movw %ax,%gs |
102 | movw %ax, %gs |
80 | movw %ax,%fs |
103 | movw %ax, %fs |
81 | movw %ax,%ds # kernel data + stack |
104 | movw %ax, %ds # kernel data + stack |
82 | movw %ax,%ss |
105 | movw %ax, %ss |
83 | 106 | ||
84 | call map_kernel # map kernel and turn paging on |
107 | call map_kernel # map kernel and turn paging on |
85 | 108 | ||
- | 109 | protected: |
|
86 | call main_bsp # never returns |
110 | call main_bsp # never returns |
87 | 111 | ||
88 | cli |
112 | cli |
89 | hlt |
113 | hlt |
90 | 114 | ||
91 | .global map_kernel |
115 | .global map_kernel |
92 | map_kernel: |
116 | map_kernel: |
93 | # |
117 | # |
94 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
118 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
95 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
119 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
96 | # |
120 | # |
97 | movl %cr4, %ecx |
121 | movl %cr4, %ecx |
98 | orl $(1<<4), %ecx |
122 | orl $(1<<4), %ecx |
99 | movl %ecx, %cr4 # turn PSE on |
123 | movl %ecx, %cr4 # turn PSE on |
100 | 124 | ||
101 | movl $((1<<7)|(1<<0)), %eax |
125 | movl $((1<<7)|(1<<0)), %eax |
102 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
126 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
103 | 127 | ||
104 | movl $(page_directory+(4096/2)), %edx |
128 | movl $(page_directory+(4096/2)), %edx |
105 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
129 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
106 | 130 | ||
107 | leal page_directory, %eax |
131 | leal page_directory, %eax |
108 | movl %eax, %cr3 |
132 | movl %eax, %cr3 |
109 | 133 | ||
110 | # turn paging on |
134 | # turn paging on |
111 | movl %cr0, %ebx |
135 | movl %cr0, %ebx |
112 | orl $(1<<31), %ebx |
136 | orl $(1<<31), %ebx |
113 | movl %ebx, %cr0 |
137 | movl %ebx, %cr0 |
114 | ret |
138 | ret |
115 | 139 | ||
116 | 140 | ||
117 | .section K_DATA_START |
141 | .section K_DATA_START |
118 | 142 | ||
119 | .align 4096 |
143 | .align 4096 |
120 | page_directory: |
144 | page_directory: |
121 | .space 4096, 0 |
145 | .space 4096, 0 |
122 | 146 |