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Rev | Author | Line No. | Line |
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1 | jermar | 1 | # |
2071 | jermar | 2 | # Copyright (c) 2001-2004 Jakub Jermar |
3 | # Copyright (c) 2005-2006 Martin Decky |
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1 | jermar | 4 | # All rights reserved. |
5 | # |
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6 | # Redistribution and use in source and binary forms, with or without |
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7 | # modification, are permitted provided that the following conditions |
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8 | # are met: |
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9 | # |
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10 | # - Redistributions of source code must retain the above copyright |
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11 | # notice, this list of conditions and the following disclaimer. |
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12 | # - Redistributions in binary form must reproduce the above copyright |
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13 | # notice, this list of conditions and the following disclaimer in the |
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14 | # documentation and/or other materials provided with the distribution. |
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15 | # - The name of the author may not be used to endorse or promote products |
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16 | # derived from this software without specific prior written permission. |
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17 | # |
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18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | # |
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29 | |||
30 | # |
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31 | # Init code for application processors. |
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32 | # |
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33 | |||
693 | decky | 34 | #include <arch/boot/boot.h> |
35 | #include <arch/boot/memmap.h> |
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36 | #include <arch/mm/page.h> |
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37 | #include <arch/pm.h> |
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1 | jermar | 38 | |
693 | decky | 39 | .section K_TEXT_START, "ax" |
40 | |||
458 | decky | 41 | #ifdef CONFIG_SMP |
1 | jermar | 42 | |
693 | decky | 43 | .global unmapped_ap_boot |
1 | jermar | 44 | |
45 | KTEXT=8 |
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46 | KDATA=16 |
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47 | |||
48 | # This piece of code is real-mode and is meant to be alligned at 4K boundary. |
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49 | # The requirement for such an alignment comes from MP Specification's STARTUP IPI |
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50 | # requirements. |
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51 | |||
52 | .align 4096 |
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693 | decky | 53 | unmapped_ap_boot: |
1 | jermar | 54 | .code16 |
55 | cli |
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267 | decky | 56 | xorw %ax, %ax |
57 | movw %ax, %ds |
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1 | jermar | 58 | |
1246 | vana | 59 | lgdtl ap_gdtr # initialize Global Descriptor Table register |
177 | jermar | 60 | |
267 | decky | 61 | movl %cr0, %eax |
62 | orl $1, %eax |
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279 | decky | 63 | movl %eax, %cr0 # switch to protected mode |
693 | decky | 64 | jmpl $KTEXT, $jump_to_kernel - BOOT_OFFSET + AP_BOOT_OFFSET |
267 | decky | 65 | |
1 | jermar | 66 | jump_to_kernel: |
67 | .code32 |
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267 | decky | 68 | movw $KDATA, %ax |
69 | movw %ax, %ds |
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70 | movw %ax, %es |
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71 | movw %ax, %ss |
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1780 | jermar | 72 | movl $KA2PA(ctx), %eax # KA2PA((uintptr_t) &ctx) |
267 | decky | 73 | movl (%eax), %esp |
74 | subl $0x80000000, %esp # KA2PA(ctx.sp) |
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1 | jermar | 75 | |
267 | decky | 76 | call map_kernel # map kernel and turn paging on |
77 | |||
298 | decky | 78 | addl $0x80000000, %esp # PA2KA(ctx.sp) |
79 | |||
267 | decky | 80 | jmpl $KTEXT, $main_ap |
1 | jermar | 81 | |
458 | decky | 82 | #endif /* CONFIG_SMP */ |
693 | decky | 83 | |
84 | |||
1242 | jermar | 85 | .section K_DATA_START, "aw", @progbits |
693 | decky | 86 | |
87 | #ifdef CONFIG_SMP |
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88 | |||
89 | .global unmapped_ap_gdtr |
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90 | |||
91 | unmapped_ap_gdtr: |
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92 | .word 0 |
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93 | .long 0 |
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94 | |||
95 | #endif /* CONFIG_SMP */ |