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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 real_bootstrap_gdtr # initialize Global Descriptor Table register |
55 | lgdt real_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 | call main_bsp # never returns |
96 | call main_bsp # never returns |
97 | 97 | ||
98 | cli |
98 | cli |
99 | hlt |
99 | hlt |
100 | 100 | ||
101 | multiboot_image_start: |
101 | multiboot_image_start: |
102 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
102 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
103 | 103 | ||
104 | lgdt protected_bootstrap_gdtr - 0x80000000 # initialize Global Descriptor Table register |
104 | lgdt protected_bootstrap_gdtr - 0x80000000 # initialize Global Descriptor Table register |
105 | 105 | ||
106 | movw $KDATA, %ax |
106 | movw $KDATA, %cx |
107 | movw %ax, %es |
107 | movw %cx, %es |
108 | movw %ax, %gs |
108 | movw %cx, %gs |
109 | movw %ax, %fs |
109 | movw %cx, %fs |
110 | movw %ax, %ds # kernel data + stack |
110 | movw %cx, %ds # kernel data + stack |
111 | movw %ax, %ss |
111 | movw %cx, %ss |
112 | 112 | ||
113 | jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET |
113 | jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET |
114 | multiboot_meeting_point: |
114 | multiboot_meeting_point: |
115 | 115 | ||
- | 116 | pushl %ebx |
|
- | 117 | pushl %eax |
|
- | 118 | ||
116 | call map_kernel # map kernel and turn paging on |
119 | call map_kernel # map kernel and turn paging on |
117 | 120 | ||
- | 121 | popl %eax |
|
- | 122 | popl %ebx |
|
- | 123 | cmpl $MULTIBOOT_LOADER_MAGIC, %eax |
|
- | 124 | je valid_boot |
|
- | 125 | ||
- | 126 | # ... |
|
- | 127 | ||
- | 128 | jmp invalid_boot |
|
- | 129 | ||
- | 130 | valid_boot: |
|
- | 131 | ||
- | 132 | movl (%ebx), %eax |
|
- | 133 | ||
- | 134 | # ... check flags in eax |
|
- | 135 | ||
- | 136 | movl 4(%ebx), %ecx |
|
- | 137 | addl 8(%ebx), %ecx |
|
- | 138 | movl %ecx, e801memorysize |
|
- | 139 | ||
- | 140 | # movl 44(%ebx), %ecx |
|
- | 141 | xorl %ecx, %ecx |
|
- | 142 | movl %ecx, e820counter |
|
- | 143 | # movl 48(%ebx), %esi |
|
- | 144 | # movl $e820table, %edi |
|
- | 145 | # cld |
|
- | 146 | # rep movsb |
|
- | 147 | ||
- | 148 | invalid_boot: |
|
- | 149 | ||
118 | call main_bsp - BOOT_OFFSET # never returns |
150 | call main_bsp - BOOT_OFFSET # never returns |
119 | 151 | ||
120 | cli |
152 | cli |
121 | hlt |
153 | hlt |
122 | 154 | ||
123 | .global map_kernel |
155 | .global map_kernel |
124 | map_kernel: |
156 | map_kernel: |
125 | # |
157 | # |
126 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
158 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
127 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
159 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
128 | # |
160 | # |
129 | movl %cr4, %ecx |
161 | movl %cr4, %ecx |
130 | orl $(1<<4), %ecx |
162 | orl $(1<<4), %ecx |
131 | movl %ecx, %cr4 # turn PSE on |
163 | movl %ecx, %cr4 # turn PSE on |
132 | 164 | ||
133 | movl $((1<<7)|(1<<0)), %eax |
165 | movl $((1<<7)|(1<<0)), %eax |
134 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
166 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
135 | 167 | ||
136 | movl $(page_directory+(4096/2)), %edx |
168 | movl $(page_directory+(4096/2)), %edx |
137 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
169 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
138 | 170 | ||
139 | leal page_directory, %eax |
171 | leal page_directory, %eax |
140 | movl %eax, %cr3 |
172 | movl %eax, %cr3 |
141 | 173 | ||
142 | # turn paging on |
174 | # turn paging on |
143 | movl %cr0, %ebx |
175 | movl %cr0, %ebx |
144 | orl $(1<<31), %ebx |
176 | orl $(1<<31), %ebx |
145 | movl %ebx, %cr0 |
177 | movl %ebx, %cr0 |
146 | ret |
178 | ret |
147 | 179 | ||
148 | 180 | ||
149 | .section K_DATA_START |
181 | .section K_DATA_START |
150 | 182 | ||
151 | .align 4096 |
183 | .align 4096 |
152 | page_directory: |
184 | page_directory: |
153 | .space 4096, 0 |
185 | .space 4096, 0 |
154 | 186 |