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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 | #define __ASM__ |
29 | #define __ASM__ |
30 | 30 | ||
31 | #include <arch/boot/boot.h> |
31 | #include <arch/boot/boot.h> |
32 | #include <arch/boot/memmapasm.h> |
32 | #include <arch/boot/memmapasm.h> |
33 | #include <arch/mm/page.h> |
33 | #include <arch/mm/page.h> |
34 | #include <arch/pm.h> |
34 | #include <arch/pm.h> |
35 | 35 | ||
36 | .section K_TEXT_START, "ax" |
36 | .section K_TEXT_START, "ax" |
37 | .global kernel_image_start |
37 | .global kernel_image_start |
38 | 38 | ||
39 | KTEXT=8 |
39 | KTEXT=8 |
40 | KDATA=16 |
40 | KDATA=16 |
41 | 41 | ||
42 | .code16 |
42 | .code16 |
43 | # |
43 | # |
44 | # This is where we require any SPARTAN-kernel-compatible boot loader |
44 | # This is where we require any SPARTAN-kernel-compatible boot loader |
45 | # to pass control in real mode. |
45 | # to pass control in real mode. |
46 | # |
46 | # |
47 | # Protected mode tables are statically initialised during compile |
47 | # Protected mode tables are statically initialised during compile |
48 | # time. So we can just load the respective table registers and |
48 | # time. So we can just load the respective table registers and |
49 | # switch to protected mode. |
49 | # switch to protected mode. |
50 | # |
50 | # |
51 | kernel_image_start: |
51 | kernel_image_start: |
52 | cli |
52 | cli |
53 | xorw %ax, %ax |
53 | xorw %ax, %ax |
54 | movw %ax, %ds |
54 | movw %ax, %ds |
55 | movw %ax, %es |
55 | movw %ax, %es |
56 | movw %ax, %ss # initialize stack segment register |
56 | movw %ax, %ss # initialize stack segment register |
57 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
57 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
58 | 58 | ||
59 | call memmap_arch_init |
59 | call memmap_arch_init |
60 | 60 | ||
61 | lgdt real_bootstrap_gdtr_boot # initialize Global Descriptor Table register |
61 | lgdt real_bootstrap_gdtr_boot # initialize Global Descriptor Table register |
62 | 62 | ||
63 | movl %cr0, %eax |
63 | movl %cr0, %eax |
64 | orl $0x1, %eax |
64 | orl $0x1, %eax |
65 | movl %eax, %cr0 # switch to protected mode |
65 | movl %eax, %cr0 # switch to protected mode |
66 | 66 | ||
67 | jmpl $KTEXT, $boot_image_start |
67 | jmpl $KTEXT, $boot_image_start |
68 | 68 | ||
69 | .code32 |
69 | .code32 |
70 | .align 4 |
70 | .align 4 |
71 | multiboot_header: |
71 | multiboot_header: |
72 | .long MULTIBOOT_HEADER_MAGIC |
72 | .long MULTIBOOT_HEADER_MAGIC |
73 | .long MULTIBOOT_HEADER_FLAGS |
73 | .long MULTIBOOT_HEADER_FLAGS |
74 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
74 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
75 | .long multiboot_header + BOOT_OFFSET |
75 | .long multiboot_header + BOOT_OFFSET |
76 | .long unmapped_ktext_start + BOOT_OFFSET |
76 | .long unmapped_ktext_start + BOOT_OFFSET |
77 | .long 0 |
77 | .long 0 |
78 | .long 0 |
78 | .long 0 |
79 | .long multiboot_image_start + BOOT_OFFSET |
79 | .long multiboot_image_start + BOOT_OFFSET |
80 | 80 | ||
81 | boot_image_start: |
81 | boot_image_start: |
82 | movw $KDATA, %ax |
82 | movw $KDATA, %ax |
83 | movw %ax, %es |
83 | movw %ax, %es |
84 | movw %ax, %gs |
84 | movw %ax, %gs |
85 | movw %ax, %fs |
85 | movw %ax, %fs |
86 | movw %ax, %ds # kernel data + stack |
86 | movw %ax, %ds # kernel data + stack |
87 | movw %ax, %ss |
87 | movw %ax, %ss |
88 | 88 | ||
89 | movb $0xd1, %al # enable A20 using i8042 controller |
89 | movb $0xd1, %al # enable A20 using i8042 controller |
90 | outb %al, $0x64 |
90 | outb %al, $0x64 |
91 | movb $0xdf, %al |
91 | movb $0xdf, %al |
92 | outb %al, $0x60 |
92 | outb %al, $0x60 |
93 | 93 | ||
94 | movl $BOOTSTRAP_OFFSET, %esi |
94 | movl $BOOTSTRAP_OFFSET, %esi |
95 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi |
95 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi |
96 | movl $_hardcoded_kernel_size, %ecx |
96 | movl $_hardcoded_kernel_size, %ecx |
97 | cld |
97 | cld |
98 | rep movsb |
98 | rep movsb |
99 | 99 | ||
100 | call map_kernel # map kernel and turn paging on |
100 | call map_kernel # map kernel and turn paging on |
101 | 101 | ||
102 | call main_bsp # never returns |
102 | call main_bsp # never returns |
103 | 103 | ||
104 | cli |
104 | cli |
105 | hlt |
105 | hlt |
106 | 106 | ||
107 | multiboot_image_start: |
107 | multiboot_image_start: |
108 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
108 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
109 | 109 | ||
110 | lgdt protected_bootstrap_gdtr - 0x80000000 # initialize Global Descriptor Table register |
110 | lgdt protected_bootstrap_gdtr - 0x80000000 # initialize Global Descriptor Table register |
111 | 111 | ||
112 | movw $KDATA, %cx |
112 | movw $KDATA, %cx |
113 | movw %cx, %es |
113 | movw %cx, %es |
114 | movw %cx, %gs |
114 | movw %cx, %gs |
115 | movw %cx, %fs |
115 | movw %cx, %fs |
116 | movw %cx, %ds # kernel data + stack |
116 | movw %cx, %ds # kernel data + stack |
117 | movw %cx, %ss |
117 | movw %cx, %ss |
118 | 118 | ||
119 | jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET |
119 | jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET |
120 | multiboot_meeting_point: |
120 | multiboot_meeting_point: |
121 | 121 | ||
122 | pushl %ebx # save parameters from GRUB |
122 | pushl %ebx # save parameters from GRUB |
123 | pushl %eax |
123 | pushl %eax |
124 | 124 | ||
125 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi |
125 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi |
126 | movl $BOOTSTRAP_OFFSET, %edi |
126 | movl $BOOTSTRAP_OFFSET, %edi |
127 | movl $_hardcoded_unmapped_size, %ecx |
127 | movl $_hardcoded_unmapped_size, %ecx |
128 | cld |
128 | cld |
129 | rep movsb |
129 | rep movsb |
130 | 130 | ||
131 | call map_kernel # map kernel and turn paging on |
131 | call map_kernel # map kernel and turn paging on |
132 | 132 | ||
133 | popl %eax |
133 | popl %eax |
134 | popl %ebx |
134 | popl %ebx |
135 | cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature |
135 | cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature |
136 | je valid_boot |
136 | je valid_boot |
137 | 137 | ||
138 | xorl %ecx, %ecx # no memory size or map available |
138 | xorl %ecx, %ecx # no memory size or map available |
139 | movl %ecx, e801memorysize |
139 | movl %ecx, e801memorysize |
140 | movl %ecx, e820counter |
140 | movl %ecx, e820counter |
141 | 141 | ||
142 | jmp invalid_boot |
142 | jmp invalid_boot |
143 | 143 | ||
144 | valid_boot: |
144 | valid_boot: |
145 | 145 | ||
146 | movl (%ebx), %eax # ebx = physical address of struct multiboot_info |
146 | movl (%ebx), %eax # ebx = physical address of struct multiboot_info |
147 | 147 | ||
148 | bt $0, %eax # mbi->flags[0] (mem_lower, mem_upper valid) |
148 | bt $0, %eax # mbi->flags[0] (mem_lower, mem_upper valid) |
149 | jc mem_valid |
149 | jc mem_valid |
150 | 150 | ||
151 | xorl %ecx, %ecx |
151 | xorl %ecx, %ecx |
152 | jmp mem_invalid |
152 | jmp mem_invalid |
153 | 153 | ||
154 | mem_valid: |
154 | mem_valid: |
155 | movl 4(%ebx), %ecx # mbi->mem_lower |
155 | movl 4(%ebx), %ecx # mbi->mem_lower |
156 | addl 8(%ebx), %ecx # mbi->mem_upper |
156 | addl 8(%ebx), %ecx # mbi->mem_upper |
157 | 157 | ||
158 | mem_invalid: |
158 | mem_invalid: |
159 | movl %ecx, e801memorysize |
159 | movl %ecx, e801memorysize |
160 | 160 | ||
161 | bt $6, %eax # mbi->flags[6] (mmap_length, mmap_addr valid) |
161 | bt $6, %eax # mbi->flags[6] (mmap_length, mmap_addr valid) |
162 | jc mmap_valid |
162 | jc mmap_valid |
163 | 163 | ||
164 | xorl %edx, %edx |
164 | xorl %edx, %edx |
165 | jmp mmap_invalid |
165 | jmp mmap_invalid |
166 | 166 | ||
167 | mmap_valid: |
167 | mmap_valid: |
168 | movl 44(%ebx), %ecx # mbi->mmap_length |
168 | movl 44(%ebx), %ecx # mbi->mmap_length |
169 | movl 48(%ebx), %esi # mbi->mmap_addr |
169 | movl 48(%ebx), %esi # mbi->mmap_addr |
170 | movl $e820table, %edi |
170 | movl $e820table, %edi |
171 | xorl %edx, %edx |
171 | xorl %edx, %edx |
172 | 172 | ||
173 | mmap_loop: |
173 | mmap_loop: |
174 | cmpl $0, %ecx |
174 | cmpl $0, %ecx |
175 | jle mmap_end |
175 | jle mmap_end |
176 | 176 | ||
177 | movl 4(%esi), %eax # mmap->base_addr_low |
177 | movl 4(%esi), %eax # mmap->base_addr_low |
178 | movl %eax, (%edi) |
178 | movl %eax, (%edi) |
179 | 179 | ||
180 | movl 8(%esi), %eax # mmap->base_addr_high |
180 | movl 8(%esi), %eax # mmap->base_addr_high |
181 | movl %eax, 4(%edi) |
181 | movl %eax, 4(%edi) |
182 | 182 | ||
183 | movl 12(%esi), %eax # mmap->length_low |
183 | movl 12(%esi), %eax # mmap->length_low |
184 | movl %eax, 8(%edi) |
184 | movl %eax, 8(%edi) |
185 | 185 | ||
186 | movl 16(%esi), %eax # mmap->length_high |
186 | movl 16(%esi), %eax # mmap->length_high |
187 | movl %eax, 12(%edi) |
187 | movl %eax, 12(%edi) |
188 | 188 | ||
189 | movl 20(%esi), %eax # mmap->type |
189 | movl 20(%esi), %eax # mmap->type |
190 | movl %eax, 16(%edi) |
190 | movl %eax, 16(%edi) |
191 | 191 | ||
192 | movl (%esi), %eax # mmap->size |
192 | movl (%esi), %eax # mmap->size |
193 | addl $0x4, %eax |
193 | addl $0x4, %eax |
194 | addl %eax, %esi |
194 | addl %eax, %esi |
195 | subl %eax, %ecx |
195 | subl %eax, %ecx |
196 | addl $MEMMAP_E820_RECORD_SIZE, %edi |
196 | addl $MEMMAP_E820_RECORD_SIZE, %edi |
197 | incl %edx |
197 | incl %edx |
198 | jmp mmap_loop |
198 | jmp mmap_loop |
199 | 199 | ||
200 | mmap_end: |
200 | mmap_end: |
201 | 201 | ||
202 | mmap_invalid: |
202 | mmap_invalid: |
203 | movl %edx, e820counter |
203 | movl %edx, e820counter |
204 | 204 | ||
205 | invalid_boot: |
205 | invalid_boot: |
206 | 206 | ||
207 | call main_bsp - BOOT_OFFSET # never returns |
207 | call main_bsp - BOOT_OFFSET # never returns |
208 | 208 | ||
209 | cli |
209 | cli |
210 | hlt |
210 | hlt |
211 | 211 | ||
212 | .global map_kernel |
212 | .global map_kernel |
213 | map_kernel: |
213 | map_kernel: |
214 | # |
214 | # |
215 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
215 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
216 | # For simplicity, we map the entire 4G space. |
216 | # For simplicity, we map the entire 4G space. |
217 | # |
217 | # |
218 | movl %cr4, %ecx |
218 | movl %cr4, %ecx |
219 | orl $(1<<4), %ecx |
219 | orl $(1<<4), %ecx |
220 | movl %ecx, %cr4 # turn PSE on |
220 | movl %ecx, %cr4 # turn PSE on |
221 | 221 | ||
222 | movl $(page_directory+0), %esi |
222 | movl $(page_directory+0), %esi |
223 | movl $(page_directory+2048), %edi |
223 | movl $(page_directory+2048), %edi |
224 | xorl %ecx, %ecx |
224 | xorl %ecx, %ecx |
225 | xorl %ebx, %ebx |
225 | xorl %ebx, %ebx |
226 | 0: |
226 | 0: |
227 | movl $((1<<7)|(1<<0)), %eax |
227 | movl $((1<<7)|(1<<0)), %eax |
228 | orl %ebx, %eax |
228 | orl %ebx, %eax |
229 | movl %eax, (%esi,%ecx,4) # mapping 0x00000000+%ecx*4M => 0x00000000+%ecx*4M |
229 | movl %eax, (%esi,%ecx,4) # mapping 0x00000000+%ecx*4M => 0x00000000+%ecx*4M |
230 | movl %eax, (%edi,%ecx,4) # mapping 0x80000000+%ecx*4M => 0x00000000+%ecx*4M |
230 | movl %eax, (%edi,%ecx,4) # mapping 0x80000000+%ecx*4M => 0x00000000+%ecx*4M |
231 | addl $(4*1024*1024), %ebx |
231 | addl $(4*1024*1024), %ebx |
232 | 232 | ||
233 | incl %ecx |
233 | incl %ecx |
234 | cmpl $512, %ecx |
234 | cmpl $512, %ecx |
235 | jl 0b |
235 | jl 0b |
236 | 236 | ||
237 | movl %esi, %cr3 |
237 | movl %esi, %cr3 |
238 | 238 | ||
239 | # turn paging on |
239 | # turn paging on |
240 | movl %cr0, %ebx |
240 | movl %cr0, %ebx |
241 | orl $(1<<31), %ebx |
241 | orl $(1<<31), %ebx |
242 | movl %ebx, %cr0 |
242 | movl %ebx, %cr0 |
243 | ret |
243 | ret |
244 | 244 | ||
245 | 245 | ||
246 | .section K_DATA_START, "aw", @progbits |
246 | .section K_DATA_START, "aw", @progbits |
247 | 247 | ||
248 | .align 4096 |
248 | .align 4096 |
249 | page_directory: |
249 | page_directory: |
250 | .space 4096, 0 |
250 | .space 4096, 0 |
251 | 251 | ||
252 | .global real_bootstrap_gdtr_boot |
252 | .global real_bootstrap_gdtr_boot |
253 | real_bootstrap_gdtr_boot: |
253 | real_bootstrap_gdtr_boot: |
254 | .word selector(GDT_ITEMS) |
254 | .word selector(GDT_ITEMS) |
255 | .long KA2PA(gdt)-BOOT_OFFSET |
255 | .long KA2PA(gdt)-BOOT_OFFSET |
256 | 256 | ||
257 | 257 |