| 1 | #
|
|---|
| 2 | # Copyright (c) 2008 Jakub Jermar
|
|---|
| 3 | # Copyright (c) 2005-2006 Martin Decky
|
|---|
| 4 | # All rights reserved.
|
|---|
| 5 | #
|
|---|
| 6 | # Redistribution and use in source and binary forms, with or without
|
|---|
| 7 | # modification, are permitted provided that the following conditions
|
|---|
| 8 | # are met:
|
|---|
| 9 | #
|
|---|
| 10 | # - Redistributions of source code must retain the above copyright
|
|---|
| 11 | # notice, this list of conditions and the following disclaimer.
|
|---|
| 12 | # - Redistributions in binary form must reproduce the above copyright
|
|---|
| 13 | # notice, this list of conditions and the following disclaimer in the
|
|---|
| 14 | # documentation and/or other materials provided with the distribution.
|
|---|
| 15 | # - The name of the author may not be used to endorse or promote products
|
|---|
| 16 | # derived from this software without specific prior written permission.
|
|---|
| 17 | #
|
|---|
| 18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 26 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 28 | #
|
|---|
| 29 |
|
|---|
| 30 | #
|
|---|
| 31 | # Init code for application processors.
|
|---|
| 32 | #
|
|---|
| 33 |
|
|---|
| 34 | #include <arch/boot/boot.h>
|
|---|
| 35 | #include <arch/boot/memmap.h>
|
|---|
| 36 | #include <arch/mm/page.h>
|
|---|
| 37 | #include <arch/pm.h>
|
|---|
| 38 | #include <arch/cpu.h>
|
|---|
| 39 | #include <arch/cpuid.h>
|
|---|
| 40 |
|
|---|
| 41 | .section K_TEXT_START, "ax"
|
|---|
| 42 |
|
|---|
| 43 | #ifdef CONFIG_SMP
|
|---|
| 44 |
|
|---|
| 45 | .global unmapped_ap_boot
|
|---|
| 46 |
|
|---|
| 47 | # This piece of code is real-mode and is meant to be alligned at 4K boundary.
|
|---|
| 48 | # The requirement for such an alignment comes from MP Specification's STARTUP
|
|---|
| 49 | # IPI requirements.
|
|---|
| 50 |
|
|---|
| 51 | .align 4096
|
|---|
| 52 | unmapped_ap_boot:
|
|---|
| 53 | .code16
|
|---|
| 54 | cli
|
|---|
| 55 | xorw %ax, %ax
|
|---|
| 56 | movw %ax, %ds
|
|---|
| 57 |
|
|---|
| 58 | lgdtl ap_gdtr # initialize Global Descriptor Table register
|
|---|
| 59 |
|
|---|
| 60 | movl %cr0, %eax
|
|---|
| 61 | orl $1, %eax
|
|---|
| 62 | movl %eax, %cr0 # switch to protected mode
|
|---|
| 63 | jmpl $gdtselector(KTEXT32_DES), $jump_to_kernel - BOOT_OFFSET + AP_BOOT_OFFSET
|
|---|
| 64 |
|
|---|
| 65 | jump_to_kernel:
|
|---|
| 66 | .code32
|
|---|
| 67 | movw $gdtselector(KDATA_DES), %ax
|
|---|
| 68 | movw %ax, %ds
|
|---|
| 69 | movw %ax, %es
|
|---|
| 70 | movw %ax, %ss
|
|---|
| 71 | movw $gdtselector(UDATA_DES), %ax
|
|---|
| 72 | movw %ax, %gs
|
|---|
| 73 |
|
|---|
| 74 | # Enable 64-bit page transaltion entries - CR4.PAE = 1.
|
|---|
| 75 | # Paging is not enabled until after long mode is enabled
|
|---|
| 76 |
|
|---|
| 77 | movl %cr4, %eax
|
|---|
| 78 | btsl $5, %eax
|
|---|
| 79 | movl %eax, %cr4
|
|---|
| 80 |
|
|---|
| 81 | leal ptl_0, %eax
|
|---|
| 82 | movl %eax, %cr3
|
|---|
| 83 |
|
|---|
| 84 | # Enable long mode
|
|---|
| 85 | movl $EFER_MSR_NUM, %ecx # EFER MSR number
|
|---|
| 86 | rdmsr # Read EFER
|
|---|
| 87 | btsl $AMD_LME_FLAG, %eax # Set LME=1
|
|---|
| 88 | wrmsr # Write EFER
|
|---|
| 89 |
|
|---|
| 90 | # Enable paging to activate long mode (set CR0.PG=1)
|
|---|
| 91 | movl %cr0, %eax
|
|---|
| 92 | btsl $31, %eax
|
|---|
| 93 | movl %eax, %cr0
|
|---|
| 94 |
|
|---|
| 95 | # At this point we are in compatibility mode
|
|---|
| 96 | jmpl $gdtselector(KTEXT_DES), $start64 - BOOT_OFFSET + AP_BOOT_OFFSET
|
|---|
| 97 |
|
|---|
| 98 | .code64
|
|---|
| 99 | start64:
|
|---|
| 100 | movq (ctx), %rsp
|
|---|
| 101 | pushq $0
|
|---|
| 102 | movq %rsp, %rbp
|
|---|
| 103 | call main_ap - AP_BOOT_OFFSET + BOOT_OFFSET # never returns
|
|---|
| 104 |
|
|---|
| 105 | #endif /* CONFIG_SMP */
|
|---|
| 106 |
|
|---|
| 107 | .section K_DATA_START, "aw", @progbits
|
|---|
| 108 |
|
|---|
| 109 | #ifdef CONFIG_SMP
|
|---|
| 110 |
|
|---|
| 111 | .global unmapped_ap_gdtr
|
|---|
| 112 | unmapped_ap_gdtr:
|
|---|
| 113 | .word 0
|
|---|
| 114 | .long 0
|
|---|
| 115 |
|
|---|
| 116 | #endif /* CONFIG_SMP */
|
|---|
