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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 | KTEXT=8 |
34 | KTEXT=8 |
35 | KDATA=16 |
35 | KDATA=16 |
36 | 36 | ||
37 | .code16 |
37 | .code16 |
38 | # |
38 | # |
39 | # This is where we require any SPARTAN-kernel-compatible boot loader |
39 | # This is where we require any SPARTAN-kernel-compatible boot loader |
40 | # to pass control in real mode. |
40 | # to pass control in real mode. |
41 | # |
41 | # |
42 | # Protected mode tables are statically initialised during compile |
42 | # Protected mode tables are statically initialised during compile |
43 | # time. So we can just load the respective table registers and |
43 | # time. So we can just load the respective table registers and |
44 | # switch to protected mode. |
44 | # switch to protected mode. |
45 | # |
45 | # |
46 | kernel_image_start: |
46 | kernel_image_start: |
47 | cli |
47 | cli |
48 | xorw %ax, %ax |
48 | xorw %ax, %ax |
49 | movw %ax, %ds |
49 | movw %ax, %ds |
50 | movw %ax, %ss # initialize stack segment register |
50 | movw %ax, %ss # initialize stack segment register |
51 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
51 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
52 | 52 | ||
53 | call memmap_arch_init |
53 | call memmap_arch_init |
54 | 54 | ||
55 | lgdt bsp_bootstrap_gdtr # initialize Global Descriptor Table register |
55 | lgdt bsp_bootstrap_gdtr # initialize Global Descriptor Table register |
56 | 56 | ||
57 | movl %cr0, %eax |
57 | movl %cr0, %eax |
58 | orl $0x1, %eax |
58 | orl $0x1, %eax |
59 | movl %eax, %cr0 # switch to protected mode |
59 | movl %eax, %cr0 # switch to protected mode |
60 | 60 | ||
61 | jmpl $KTEXT, $boot_image_start |
61 | jmpl $KTEXT, $boot_image_start |
62 | 62 | ||
63 | .code32 |
63 | .code32 |
64 | .align 4 |
64 | .align 4 |
65 | multiboot_header: |
65 | multiboot_header: |
66 | .long MULTIBOOT_HEADER_MAGIC |
66 | .long MULTIBOOT_HEADER_MAGIC |
67 | .long MULTIBOOT_HEADER_FLAGS |
67 | .long MULTIBOOT_HEADER_FLAGS |
68 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
68 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
69 | .long multiboot_header + BOOT_OFFSET |
69 | .long multiboot_header + BOOT_OFFSET |
70 | .long unmapped_ktext_start + BOOT_OFFSET |
70 | .long unmapped_ktext_start + BOOT_OFFSET |
71 | .long 0 |
71 | .long 0 |
72 | .long 0 |
72 | .long 0 |
73 | .long multiboot_image_start + BOOT_OFFSET |
73 | .long multiboot_image_start + BOOT_OFFSET |
74 | 74 | ||
75 | boot_image_start: |
75 | boot_image_start: |
76 | movw $KDATA, %ax |
76 | movw $KDATA, %ax |
77 | movw %ax, %es |
77 | movw %ax, %es |
78 | movw %ax, %gs |
78 | movw %ax, %gs |
79 | movw %ax, %fs |
79 | movw %ax, %fs |
80 | movw %ax, %ds # kernel data + stack |
80 | movw %ax, %ds # kernel data + stack |
81 | movw %ax, %ss |
81 | movw %ax, %ss |
82 | 82 | ||
83 | call map_kernel # map kernel and turn paging on |
83 | call map_kernel # map kernel and turn paging on |
84 | 84 | ||
85 | movb $0xd1, %al # enable A20 using the keyboard controller |
85 | movb $0xd1, %al # enable A20 using the keyboard controller |
86 | outb %al, $0x64 |
86 | outb %al, $0x64 |
87 | movb $0xdf, %al |
87 | movb $0xdf, %al |
88 | outb %al, $0x60 |
88 | outb %al, $0x60 |
89 | 89 | ||
90 | movl $BOOTSTRAP_OFFSET, %esi |
90 | movl $BOOTSTRAP_OFFSET, %esi |
91 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi |
91 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi |
92 | movl $_hardcoded_kernel_size, %ecx |
92 | movl $_hardcoded_kernel_size, %ecx |
93 | cld |
93 | cld |
94 | rep movsb |
94 | rep movsb |
95 | 95 | ||
96 | jmp protected |
96 | jmp protected |
97 | 97 | ||
98 | multiboot_image_start: |
98 | multiboot_image_start: |
99 | movl BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
99 | movl BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
100 | 100 | ||
101 | lgdt gdtr # initialize Global Descriptor Table register |
101 | lgdt gdtr # initialize Global Descriptor Table register |
102 | 102 | ||
103 | movw $KDATA, %ax |
103 | movw $KDATA, %ax |
104 | movw %ax, %es |
104 | movw %ax, %es |
105 | movw %ax, %gs |
105 | movw %ax, %gs |
106 | movw %ax, %fs |
106 | movw %ax, %fs |
107 | movw %ax, %ds # kernel data + stack |
107 | movw %ax, %ds # kernel data + stack |
108 | movw %ax, %ss |
108 | movw %ax, %ss |
109 | 109 | ||
- | 110 | jmpl $KTEXT, $multiboot_meeting_point |
|
- | 111 | multiboot_meeting_point: |
|
- | 112 | ||
110 | call map_kernel # map kernel and turn paging on |
113 | call map_kernel # map kernel and turn paging on |
111 | 114 | ||
112 | protected: |
115 | protected: |
113 | call main_bsp # never returns |
116 | call main_bsp # never returns |
114 | 117 | ||
115 | cli |
118 | cli |
116 | hlt |
119 | hlt |
117 | 120 | ||
118 | .global map_kernel |
121 | .global map_kernel |
119 | map_kernel: |
122 | map_kernel: |
120 | # |
123 | # |
121 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
124 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
122 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
125 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
123 | # |
126 | # |
124 | movl %cr4, %ecx |
127 | movl %cr4, %ecx |
125 | orl $(1<<4), %ecx |
128 | orl $(1<<4), %ecx |
126 | movl %ecx, %cr4 # turn PSE on |
129 | movl %ecx, %cr4 # turn PSE on |
127 | 130 | ||
128 | movl $((1<<7)|(1<<0)), %eax |
131 | movl $((1<<7)|(1<<0)), %eax |
129 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
132 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
130 | 133 | ||
131 | movl $(page_directory+(4096/2)), %edx |
134 | movl $(page_directory+(4096/2)), %edx |
132 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
135 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
133 | 136 | ||
134 | leal page_directory, %eax |
137 | leal page_directory, %eax |
135 | movl %eax, %cr3 |
138 | movl %eax, %cr3 |
136 | 139 | ||
137 | # turn paging on |
140 | # turn paging on |
138 | movl %cr0, %ebx |
141 | movl %cr0, %ebx |
139 | orl $(1<<31), %ebx |
142 | orl $(1<<31), %ebx |
140 | movl %ebx, %cr0 |
143 | movl %ebx, %cr0 |
141 | ret |
144 | ret |
142 | 145 | ||
143 | 146 | ||
144 | .section K_DATA_START |
147 | .section K_DATA_START |
145 | 148 | ||
146 | .align 4096 |
149 | .align 4096 |
147 | page_directory: |
150 | page_directory: |
148 | .space 4096, 0 |
151 | .space 4096, 0 |
149 | 152 |