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277 | palkovsky | 1 | # |
2 | # Copyright (C) 2001-2004 Jakub Jermar |
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696 | decky | 3 | # Copyright (C) 2005-2006 Martin Decky |
277 | palkovsky | 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 | |||
34 | #include <arch/boot/boot.h> |
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696 | decky | 35 | #include <arch/boot/memmap.h> |
36 | #include <arch/mm/page.h> |
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277 | palkovsky | 37 | #include <arch/pm.h> |
38 | #include <arch/cpu.h> |
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39 | #include <arch/cpuid.h> |
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40 | |||
696 | decky | 41 | .section K_TEXT_START, "ax" |
42 | |||
458 | decky | 43 | #ifdef CONFIG_SMP |
277 | palkovsky | 44 | |
696 | decky | 45 | .global unmapped_ap_boot |
277 | palkovsky | 46 | |
47 | # This piece of code is real-mode and is meant to be alligned at 4K boundary. |
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48 | # The requirement for such an alignment comes from MP Specification's STARTUP IPI |
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49 | # requirements. |
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50 | |||
51 | .align 4096 |
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696 | decky | 52 | unmapped_ap_boot: |
277 | palkovsky | 53 | .code16 |
54 | cli |
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55 | xorw %ax, %ax |
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56 | movw %ax, %ds |
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57 | |||
1247 | vana | 58 | lgdtl ap_gdtr # initialize Global Descriptor Table register |
277 | palkovsky | 59 | |
60 | movl %cr0, %eax |
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61 | orl $1, %eax |
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696 | decky | 62 | movl %eax, %cr0 # switch to protected mode |
63 | jmpl $gdtselector(KTEXT32_DES), $jump_to_kernel - BOOT_OFFSET + AP_BOOT_OFFSET |
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277 | palkovsky | 64 | |
696 | decky | 65 | jump_to_kernel: |
66 | .code32 |
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277 | palkovsky | 67 | movw $gdtselector(KDATA_DES), %ax |
68 | movw %ax, %ds |
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696 | decky | 69 | movw %ax, %es |
277 | palkovsky | 70 | movw %ax, %ss |
809 | palkovsky | 71 | movw $gdtselector(UDATA_DES), %ax |
72 | movw %ax, %gs |
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277 | palkovsky | 73 | |
74 | # Enable 64-bit page transaltion entries - CR4.PAE = 1. |
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75 | # Paging is not enabled until after long mode is enabled |
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696 | decky | 76 | |
277 | palkovsky | 77 | movl %cr4, %eax |
78 | btsl $5, %eax |
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79 | movl %eax, %cr4 |
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80 | |||
696 | decky | 81 | leal ptl_0, %eax |
277 | palkovsky | 82 | movl %eax, %cr3 |
83 | |||
84 | # Enable long mode |
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85 | movl $EFER_MSR_NUM, %ecx # EFER MSR number |
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86 | rdmsr # Read EFER |
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87 | btsl $AMD_LME_FLAG, %eax # Set LME=1 |
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88 | wrmsr # Write EFER |
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89 | |||
90 | # Enable paging to activate long mode (set CR0.PG=1) |
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91 | movl %cr0, %eax |
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92 | btsl $31, %eax |
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93 | movl %eax, %cr0 |
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94 | |||
95 | # At this point we are in compatibility mode |
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696 | decky | 96 | jmpl $gdtselector(KTEXT_DES), $start64 - BOOT_OFFSET + AP_BOOT_OFFSET |
277 | palkovsky | 97 | |
98 | .code64 |
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99 | start64: |
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282 | palkovsky | 100 | movq (ctx), %rsp |
696 | decky | 101 | call main_ap - AP_BOOT_OFFSET + BOOT_OFFSET # never returns |
102 | |||
458 | decky | 103 | #endif /* CONFIG_SMP */ |
696 | decky | 104 | |
1242 | jermar | 105 | .section K_DATA_START, "aw", @progbits |
696 | decky | 106 | |
107 | #ifdef CONFIG_SMP |
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108 | |||
109 | .global unmapped_ap_gdtr |
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110 | |||
111 | unmapped_ap_gdtr: |
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112 | .word 0 |
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113 | .long 0 |
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114 | |||
115 | #endif /* CONFIG_SMP */ |