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277 | 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 | # |
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30 | # Init code for application processors. |
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31 | # |
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32 | |||
33 | #define __ASM__ |
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34 | #include <arch/boot/boot.h> |
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35 | #include <arch/pm.h> |
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36 | #include <arch/cpu.h> |
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37 | #include <arch/cpuid.h> |
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38 | #include <arch/mm/page.h> |
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39 | |||
406 | jermar | 40 | .section K_TEXT_START_2, "ax" |
277 | palkovsky | 41 | |
458 | decky | 42 | #ifdef CONFIG_SMP |
277 | palkovsky | 43 | |
44 | .global ap_boot |
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45 | |||
46 | # This piece of code is real-mode and is meant to be alligned at 4K boundary. |
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47 | # The requirement for such an alignment comes from MP Specification's STARTUP IPI |
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48 | # requirements. |
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49 | |||
50 | .align 4096 |
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51 | ap_boot: |
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52 | .code16 |
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53 | cli |
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54 | xorw %ax, %ax |
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55 | movw %ax, %ds |
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56 | |||
282 | palkovsky | 57 | lgdt real_bootstrap_gdtr_boot # initialize Global Descriptor Table register |
277 | palkovsky | 58 | |
59 | movl %cr0, %eax |
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60 | orl $1, %eax |
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61 | movl %eax, %cr0 # switch to protected mode |
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62 | |||
63 | jmpl $gdtselector(KTEXT32_DES), $now_in_prot |
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64 | |||
65 | .code32 |
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66 | now_in_prot: |
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67 | movw $gdtselector(KDATA_DES), %ax |
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68 | movw %ax, %ds |
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69 | movw %ax, %ss |
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70 | |||
71 | |||
72 | # Enable 64-bit page transaltion entries - CR4.PAE = 1. |
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73 | # Paging is not enabled until after long mode is enabled |
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74 | movl %cr4, %eax |
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75 | btsl $5, %eax |
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76 | movl %eax, %cr4 |
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77 | |||
78 | # Set up NEW paging tables, that are |
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79 | # already moved BOOT_OFFSET up |
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80 | leal ptl_0+BOOT_OFFSET, %eax |
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81 | movl %eax, %cr3 |
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82 | |||
83 | # Enable long mode |
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84 | movl $EFER_MSR_NUM, %ecx # EFER MSR number |
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85 | rdmsr # Read EFER |
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86 | btsl $AMD_LME_FLAG, %eax # Set LME=1 |
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87 | wrmsr # Write EFER |
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88 | |||
89 | # Enable paging to activate long mode (set CR0.PG=1) |
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90 | movl %cr0, %eax |
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91 | btsl $31, %eax |
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92 | movl %eax, %cr0 |
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93 | |||
94 | # At this point we are in compatibility mode |
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95 | jmpl $gdtselector(KTEXT_DES), $start64 |
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96 | |||
97 | .code64 |
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98 | start64: |
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282 | palkovsky | 99 | movq (ctx), %rsp |
277 | palkovsky | 100 | call main_ap # never returns |
101 | |||
102 | |||
458 | decky | 103 | #endif /* CONFIG_SMP */ |