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164 | palkovsky | 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 | |||
29 | .section K_TEXT_START |
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30 | .global kernel_image_start |
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31 | |||
32 | .code16 |
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33 | # |
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34 | # This is where we require any SPARTAN-kernel-compatible boot loader |
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35 | # to pass control in real mode. |
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36 | # |
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37 | # Protected mode tables are statically initialised during compile |
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38 | # time. So we can just load the respective table registers and |
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39 | # switch to protected mode. |
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40 | # |
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41 | kernel_image_start: |
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178 | palkovsky | 42 | cli |
43 | xorw %ax,%ax |
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44 | movw %ax,%ds |
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45 | movw %ax,%ss # initialize stack segment register |
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46 | movl $0x7c00,%esp # initialize stack pointer |
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47 | |||
48 | call memmap_arch_init |
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49 | |||
50 | mov $0x80000000, %eax |
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51 | cpuid |
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52 | cmp $0x80000000, %eax # any function > 80000000h? |
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53 | jbe no_long_mode |
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54 | mov $0x80000001, %eax # Extended function code 80000001 |
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55 | cpuid |
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56 | bt $29, %edx # Test if long mode is supported. |
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57 | jnc no_long_mode |
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164 | palkovsky | 58 | |
178 | palkovsky | 59 | # Fill out GDTR.base, IDTR.base |
60 | leal gdtr, %eax |
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61 | movl gdt_addr, %ebx |
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62 | movl %ebx, 2(%eax) |
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164 | palkovsky | 63 | |
178 | palkovsky | 64 | movl idt_addr, %ebx |
65 | leal idtr, %eax |
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66 | movl %ebx, 2(%eax) |
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164 | palkovsky | 67 | |
178 | palkovsky | 68 | # Load gdtr, idtr |
69 | lgdt gdtr |
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70 | lidt idtr |
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71 | |||
72 | mov $1, %eax # Enable protected mode (CR0.PE = 1) |
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73 | mov %eax, %cr0 |
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164 | palkovsky | 74 | |
178 | palkovsky | 75 | jmpl $8, $now_in_prot |
76 | |||
77 | now_in_prot: |
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78 | |||
79 | |||
80 | no_long_mode: |
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81 | 1: |
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82 | jmp 1b |
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83 | |||
84 | |||
85 | .section K_DATA_START |
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164 | palkovsky | 86 | .align 4096 |
87 | page_directory: |
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88 | .space 4096, 0 |
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178 | palkovsky | 89 | |
90 | gdt_addr: |
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91 | .quad gdt + 0x80000000 |
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92 | idt_addr: |
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93 | .quad idt + 0x80000000 |