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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 | |||
222 | decky | 29 | #include <arch/boot/boot.h> |
30 | |||
1 | jermar | 31 | .section K_TEXT_START |
32 | .global kernel_image_start |
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33 | |||
267 | decky | 34 | KTEXT=8 |
35 | KDATA=16 |
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36 | |||
1 | jermar | 37 | .code16 |
38 | # |
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39 | # This is where we require any SPARTAN-kernel-compatible boot loader |
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40 | # to pass control in real mode. |
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41 | # |
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42 | # Protected mode tables are statically initialised during compile |
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43 | # time. So we can just load the respective table registers and |
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44 | # switch to protected mode. |
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45 | # |
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46 | kernel_image_start: |
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174 | jermar | 47 | cli |
235 | decky | 48 | xorw %ax, %ax |
49 | movw %ax, %ds |
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267 | decky | 50 | movw %ax, %ss # initialize stack segment register |
51 | movl $BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
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176 | jermar | 52 | |
53 | call memmap_arch_init |
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54 | |||
267 | decky | 55 | lgdt bsp_bootstrap_gdtr # initialize Global Descriptor Table register |
177 | jermar | 56 | |
235 | decky | 57 | movl %cr0, %eax |
58 | orl $0x1, %eax |
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267 | decky | 59 | movl %eax, %cr0 # switch to protected mode |
235 | decky | 60 | |
267 | decky | 61 | jmpl $KTEXT, $boot_image_start |
235 | decky | 62 | |
112 | jermar | 63 | .code32 |
222 | decky | 64 | .align 4 |
65 | multiboot_header: |
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66 | .long MULTIBOOT_HEADER_MAGIC |
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67 | .long MULTIBOOT_HEADER_FLAGS |
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68 | .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) # checksum |
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235 | decky | 69 | .long multiboot_header + BOOT_OFFSET |
70 | .long unmapped_ktext_start + BOOT_OFFSET |
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222 | decky | 71 | .long 0 |
72 | .long 0 |
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235 | decky | 73 | .long multiboot_image_start + BOOT_OFFSET |
222 | decky | 74 | |
235 | decky | 75 | boot_image_start: |
267 | decky | 76 | movw $KDATA, %ax |
235 | decky | 77 | movw %ax, %es |
78 | movw %ax, %gs |
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79 | movw %ax, %fs |
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80 | movw %ax, %ds # kernel data + stack |
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81 | movw %ax, %ss |
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82 | |||
83 | call map_kernel # map kernel and turn paging on |
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84 | |||
85 | movb $0xd1, %al # enable A20 using the keyboard controller |
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86 | outb %al, $0x64 |
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87 | movb $0xdf, %al |
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88 | outb %al, $0x60 |
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89 | |||
267 | decky | 90 | movl $BOOTSTRAP_OFFSET, %esi |
91 | movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %edi |
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235 | decky | 92 | movl $_hardcoded_kernel_size, %ecx |
93 | cld |
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94 | rep movsb |
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95 | |||
96 | jmp protected |
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97 | |||
222 | decky | 98 | multiboot_image_start: |
267 | decky | 99 | movl BOOTSTRAP_OFFSET - 0x400, %esp # initialize stack pointer |
222 | decky | 100 | |
267 | decky | 101 | lgdt gdtr # initialize Global Descriptor Table register |
112 | jermar | 102 | |
267 | decky | 103 | movw $KDATA, %ax |
235 | decky | 104 | movw %ax, %es |
105 | movw %ax, %gs |
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106 | movw %ax, %fs |
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267 | decky | 107 | movw %ax, %ds # kernel data + stack |
235 | decky | 108 | movw %ax, %ss |
109 | |||
271 | decky | 110 | jmpl $KTEXT, $multiboot_meeting_point |
111 | multiboot_meeting_point: |
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112 | |||
267 | decky | 113 | call map_kernel # map kernel and turn paging on |
235 | decky | 114 | |
115 | protected: |
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267 | decky | 116 | call main_bsp # never returns |
110 | jermar | 117 | |
118 | cli |
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119 | hlt |
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120 | |||
121 | .global map_kernel |
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122 | map_kernel: |
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105 | jermar | 123 | # |
124 | # Here we setup mapping for both the unmapped and mapped sections of the kernel. |
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125 | # For simplicity, we set only one 4M page for 0x00000000 and one for 0x80000000. |
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126 | # |
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127 | movl %cr4, %ecx |
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128 | orl $(1<<4), %ecx |
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129 | movl %ecx, %cr4 # turn PSE on |
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1 | jermar | 130 | |
105 | jermar | 131 | movl $((1<<7)|(1<<0)), %eax |
132 | movl %eax, page_directory # mapping 0x00000000 => 0x00000000 |
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1 | jermar | 133 | |
105 | jermar | 134 | movl $(page_directory+(4096/2)), %edx |
135 | movl %eax, (%edx) # mapping 0x80000000 => 0x00000000 |
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136 | |||
137 | leal page_directory, %eax |
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138 | movl %eax, %cr3 |
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139 | |||
177 | jermar | 140 | # turn paging on |
105 | jermar | 141 | movl %cr0, %ebx |
142 | orl $(1<<31), %ebx |
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143 | movl %ebx, %cr0 |
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110 | jermar | 144 | ret |
105 | jermar | 145 | |
146 | |||
147 | .section K_DATA_START |
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148 | |||
149 | .align 4096 |
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150 | page_directory: |
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151 | .space 4096, 0 |