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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 | |||
29 | # |
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30 | # Init code for application processors. |
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31 | # |
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32 | |||
110 | jermar | 33 | .section K_TEXT_START_2 |
1 | jermar | 34 | |
35 | #ifdef __SMP__ |
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36 | |||
37 | .global ap_boot |
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38 | |||
39 | KTEXT=8 |
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40 | KDATA=16 |
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41 | |||
42 | # This piece of code is real-mode and is meant to be alligned at 4K boundary. |
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43 | # The requirement for such an alignment comes from MP Specification's STARTUP IPI |
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44 | # requirements. |
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45 | |||
46 | .align 4096 |
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47 | ap_boot: |
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48 | .code16 |
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49 | cli |
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267 | decky | 50 | xorw %ax, %ax |
51 | movw %ax, %ds |
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1 | jermar | 52 | |
267 | decky | 53 | lgdt ap_bootstrap_gdtr # initialize Global Descriptor Table register |
177 | jermar | 54 | |
267 | decky | 55 | movl %cr0, %eax |
56 | orl $1, %eax |
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57 | movl %eax, %cr0 # switch to protected mode |
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58 | jmpl $KTEXT, $jump_to_kernel |
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59 | |||
1 | jermar | 60 | jump_to_kernel: |
61 | .code32 |
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267 | decky | 62 | movw $KDATA, %ax |
63 | movw %ax, %ds |
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64 | movw %ax, %es |
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65 | movw %ax, %ss |
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66 | movl $(ctx-0x80000000), %eax # KA2PA((__address) &ctx) |
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67 | movl (%eax), %esp |
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68 | subl $0x80000000, %esp # KA2PA(ctx.sp) |
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1 | jermar | 69 | |
267 | decky | 70 | call map_kernel # map kernel and turn paging on |
71 | |||
72 | movb $0xd1, %al # enable A20 using the keyboard controller |
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73 | outb %al, $0x64 |
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74 | movb $0xdf, %al |
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75 | outb %al, $0x60 |
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1 | jermar | 76 | |
267 | decky | 77 | jmpl $KTEXT, $main_ap |
1 | jermar | 78 | |
79 | #endif /* __SMP__ */ |