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1 | jermar | 1 | # |
2 | # Copyright (C) 2001-2004 Jakub Jermar |
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3 | # All rights reserved. |
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4 | # |
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5 | # Redistribution and use in source and binary forms, with or without |
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6 | # modification, are permitted provided that the following conditions |
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7 | # are met: |
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8 | # |
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9 | # - Redistributions of source code must retain the above copyright |
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10 | # notice, this list of conditions and the following disclaimer. |
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11 | # - Redistributions in binary form must reproduce the above copyright |
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12 | # notice, this list of conditions and the following disclaimer in the |
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13 | # documentation and/or other materials provided with the distribution. |
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14 | # - The name of the author may not be used to endorse or promote products |
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15 | # derived from this software without specific prior written permission. |
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16 | # |
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17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | # |
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28 | |||
300 | palkovsky | 29 | #define __ASM__ |
30 | |||
222 | decky | 31 | #include <arch/boot/boot.h> |
285 | decky | 32 | #include <arch/boot/memmapasm.h> |
300 | palkovsky | 33 | #include <arch/mm/page.h> |
34 | #include <arch/pm.h> |
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222 | decky | 35 | |
1 | jermar | 36 | .section K_TEXT_START |
37 | .global kernel_image_start |
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38 | |||
267 | decky | 39 | KTEXT=8 |
40 | KDATA=16 |
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41 | |||
1 | jermar | 42 | .code16 |
43 | # |
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44 | # This is where we require any SPARTAN-kernel-compatible boot loader |
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45 | # to pass control in real mode. |
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46 | # |
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47 | # Protected mode tables are statically initialised during compile |
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48 | # time. So we can just load the respective table registers and |
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49 | # switch to protected mode. |
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50 | # |
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51 | kernel_image_start: |
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174 | jermar | 52 | cli |
235 | decky | 53 | xorw %ax, %ax |
54 | movw %ax, %ds |
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267 | decky | 55 | movw %ax, %ss # initialize stack segment register |
56 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
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176 | jermar | 57 | |
58 | call memmap_arch_init |
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59 | |||
300 | palkovsky | 60 | lgdt real_bootstrap_gdtr_boot # initialize Global Descriptor Table register |
177 | jermar | 61 | |
235 | decky | 62 | movl %cr0, %eax |
63 | orl $0x1, %eax |
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267 | decky | 64 | movl %eax, %cr0 # switch to protected mode |
235 | decky | 65 | |
267 | decky | 66 | jmpl $KTEXT, $boot_image_start |
235 | decky | 67 | |
112 | jermar | 68 | .code32 |
222 | decky | 69 | .align 4 |
70 | multiboot_header: |
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71 | .long MULTIBOOT_HEADER_MAGIC |
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72 | .long MULTIBOOT_HEADER_FLAGS |
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73 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
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235 | decky | 74 | .long multiboot_header + BOOT_OFFSET |
75 | .long unmapped_ktext_start + BOOT_OFFSET |
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222 | decky | 76 | .long 0 |
77 | .long 0 |
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235 | decky | 78 | .long multiboot_image_start + BOOT_OFFSET |
222 | decky | 79 | |
235 | decky | 80 | boot_image_start: |
267 | decky | 81 | movw $KDATA, %ax |
235 | decky | 82 | movw %ax, %es |
83 | movw %ax, %gs |
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84 | movw %ax, %fs |
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85 | movw %ax, %ds # kernel data + stack |
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86 | movw %ax, %ss |
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87 | |||
88 | movb $0xd1, %al # enable A20 using the keyboard controller |
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89 | outb %al, $0x64 |
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90 | movb $0xdf, %al |
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91 | outb %al, $0x60 |
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92 | |||
267 | decky | 93 | movl $BOOTSTRAP_OFFSET, %esi |
94 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi |
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235 | decky | 95 | movl $_hardcoded_kernel_size, %ecx |
96 | cld |
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97 | rep movsb |
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98 | |||
285 | decky | 99 | call map_kernel # map kernel and turn paging on |
100 | |||
279 | decky | 101 | call main_bsp # never returns |
102 | |||
103 | cli |
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104 | hlt |
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235 | decky | 105 | |
222 | decky | 106 | multiboot_image_start: |
279 | decky | 107 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
222 | decky | 108 | |
279 | decky | 109 | lgdt protected_bootstrap_gdtr - 0x80000000 # initialize Global Descriptor Table register |
112 | jermar | 110 | |
280 | decky | 111 | movw $KDATA, %cx |
112 | movw %cx, %es |
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113 | movw %cx, %gs |
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114 | movw %cx, %fs |
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115 | movw %cx, %ds # kernel data + stack |
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116 | movw %cx, %ss |
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235 | decky | 117 | |
279 | decky | 118 | jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET |
271 | decky | 119 | multiboot_meeting_point: |
120 | |||
285 | decky | 121 | pushl %ebx # save parameters from GRUB |
280 | decky | 122 | pushl %eax |
123 | |||
285 | decky | 124 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi |
125 | movl $BOOTSTRAP_OFFSET, %edi |
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126 | movl $_hardcoded_unmapped_size, %ecx |
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127 | cld |
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128 | rep movsb |
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129 | |||
279 | decky | 130 | call map_kernel # map kernel and turn paging on |
235 | decky | 131 | |
280 | decky | 132 | popl %eax |
133 | popl %ebx |
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285 | decky | 134 | cmpl $MULTIBOOT_LOADER_MAGIC, %eax # compare GRUB signature |
280 | decky | 135 | je valid_boot |
136 | |||
285 | decky | 137 | xorl %ecx, %ecx # no memory size or map available |
138 | movl %ecx, e801memorysize |
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139 | movl %ecx, e820counter |
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140 | |||
280 | decky | 141 | jmp invalid_boot |
285 | decky | 142 | |
280 | decky | 143 | valid_boot: |
144 | |||
285 | decky | 145 | movl (%ebx), %eax # ebx = physical address of struct multiboot_info |
280 | decky | 146 | |
285 | decky | 147 | bt $0, %eax # mbi->flags[0] (mem_lower, mem_upper valid) |
148 | jc mem_valid |
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149 | |||
150 | xorl %ecx, %ecx |
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151 | jmp mem_invalid |
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152 | |||
153 | mem_valid: |
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154 | movl 4(%ebx), %ecx # mbi->mem_lower |
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155 | addl 8(%ebx), %ecx # mbi->mem_upper |
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280 | decky | 156 | |
285 | decky | 157 | mem_invalid: |
280 | decky | 158 | movl %ecx, e801memorysize |
159 | |||
285 | decky | 160 | bt $6, %eax # mbi->flags[6] (mmap_length, mmap_addr valid) |
161 | jc mmap_valid |
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162 | |||
163 | xorl %edx, %edx |
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164 | jmp mmap_invalid |
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165 | |||
166 | mmap_valid: |
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167 | movl 44(%ebx), %ecx # mbi->mmap_length |
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168 | movl 48(%ebx), %esi # mbi->mmap_addr |
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169 | movl $e820table, %edi |
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170 | xorl %edx, %edx |
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280 | decky | 171 | |
285 | decky | 172 | mmap_loop: |
173 | cmpl $0, %ecx |
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174 | jle mmap_end |
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175 | |||
176 | movl 4(%esi), %eax # mmap->base_addr_low |
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177 | movl %eax, (%edi) |
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178 | |||
179 | movl 8(%esi), %eax # mmap->base_addr_high |
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180 | movl %eax, 4(%edi) |
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181 | |||
182 | movl 12(%esi), %eax # mmap->length_low |
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183 | movl %eax, 8(%edi) |
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184 | |||
185 | movl 16(%esi), %eax # mmap->length_high |
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186 | movl %eax, 12(%edi) |
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187 | |||
188 | movl 20(%esi), %eax # mmap->type |
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189 | movl %eax, 16(%edi) |
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190 | |||
191 | movl (%esi), %eax # mmap->size |
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192 | addl $0x4, %eax |
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193 | addl %eax, %esi |
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194 | subl %eax, %ecx |
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195 | addl $MEMMAP_E820_RECORD_SIZE, %edi |
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196 | incl %edx |
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197 | jmp mmap_loop |
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198 | |||
199 | mmap_end: |
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200 | |||
201 | mmap_invalid: |
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202 | movl %edx, e820counter |
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203 | |||
280 | decky | 204 | invalid_boot: |
205 | |||
279 | decky | 206 | call main_bsp - BOOT_OFFSET # never returns |
110 | jermar | 207 | |
208 | cli |
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209 | hlt |
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210 | |||
211 | .global map_kernel |
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212 | map_kernel: |
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105 | jermar | 213 | # |
214 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
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215 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
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216 | # |
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217 | movl %cr4, %ecx |
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218 | orl $(1<<4), %ecx |
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219 | movl %ecx, %cr4 # turn PSE on |
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1 | jermar | 220 | |
105 | jermar | 221 | movl $((1<<7)|(1<<0)), %eax |
222 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
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1 | jermar | 223 | |
298 | decky | 224 | movl $(page_directory+2048), %edx |
105 | jermar | 225 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
226 | |||
227 | leal page_directory, %eax |
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228 | movl %eax, %cr3 |
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229 | |||
177 | jermar | 230 | # turn paging on |
105 | jermar | 231 | movl %cr0, %ebx |
232 | orl $(1<<31), %ebx |
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233 | movl %ebx, %cr0 |
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110 | jermar | 234 | ret |
105 | jermar | 235 | |
236 | |||
237 | .section K_DATA_START |
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238 | |||
239 | .align 4096 |
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240 | page_directory: |
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241 | .space 4096, 0 |
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300 | palkovsky | 242 | |
243 | .global real_bootstrap_gdtr_boot |
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244 | real_bootstrap_gdtr_boot: |
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245 | .word selector(GDT_ITEMS) |
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246 | .long KA2PA(gdt)-BOOT_OFFSET |
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247 |