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Runtime error
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#include "apic-defs.h"
.globl boot_idt
boot_idt = 0
ipi_vector = 0x20
max_cpus = 64
.bss
. = . + 4096 * max_cpus
.align 16
stacktop:
. = . + 4096
.align 16
ring0stacktop:
.data
.align 4096
pt:
i = 0
.rept 1024
.long 0x1e7 | (i << 22)
i = i + 1
.endr
.globl gdt32
gdt32:
.quad 0
.quad 0x00cf9b000000ffff // flat 32-bit code segment
.quad 0x00cf93000000ffff // flat 32-bit data segment
.quad 0x00cf1b000000ffff // flat 32-bit code segment, not present
.quad 0 // TSS for task gates
.quad 0x008f9b000000FFFF // 16-bit code segment
.quad 0x008f93000000FFFF // 16-bit data segment
.quad 0x00cffb000000ffff // 32-bit code segment (user)
.quad 0x00cff3000000ffff // 32-bit data segment (user)
.quad 0 // unused
.quad 0 // 6 spare selectors
.quad 0
.quad 0
.quad 0
.quad 0
.quad 0
tss_descr:
.rept max_cpus
.quad 0x000089000000ffff // 32-bit avail tss
.endr
gdt32_end:
i = 0
.globl tss
tss:
.rept max_cpus
.long 0
.long ring0stacktop - i * 4096
.long 16
.quad 0, 0
.quad 0, 0, 0, 0, 0, 0, 0, 0
.long 0, 0, 0
i = i + 1
.endr
tss_end:
idt_descr:
.word 16 * 256 - 1
.long boot_idt
.section .init
.code32
mb_magic = 0x1BADB002
mb_flags = 0x0
# multiboot header
.long mb_magic, mb_flags, 0 - (mb_magic + mb_flags)
mb_cmdline = 16
MSR_GS_BASE = 0xc0000101
.macro setup_percpu_area
lea -4096(%esp), %eax
mov $0, %edx
mov $MSR_GS_BASE, %ecx
wrmsr
.endm
.globl start
start:
push %ebx
call setup_get_initrd
call setup_environ
mov mb_cmdline(%ebx), %eax
mov %eax, __args
call __setup_args
mov $stacktop, %esp
setup_percpu_area
call prepare_32
jmpl $8, $start32
prepare_32:
lgdtl gdt32_descr
mov %cr4, %eax
bts $4, %eax // pse
mov %eax, %cr4
mov $pt, %eax
mov %eax, %cr3
mov %cr0, %eax
bts $0, %eax
bts $31, %eax
mov %eax, %cr0
ret
smp_stacktop: .long 0xa0000
ap_start32:
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
mov %ax, %ss
mov $-4096, %esp
lock/xaddl %esp, smp_stacktop
setup_percpu_area
call prepare_32
call load_tss
call enable_apic
call enable_x2apic
sti
nop
lock incw cpu_online_count
1: hlt
jmp 1b
start32:
call load_tss
call mask_pic_interrupts
call enable_apic
call smp_init
call enable_x2apic
push $__environ
push $__argv
push __argc
call main
push %eax
call exit
load_tss:
lidt idt_descr
mov $16, %eax
mov %ax, %ss
mov $(APIC_DEFAULT_PHYS_BASE + APIC_ID), %eax
mov (%eax), %eax
shr $24, %eax
mov %eax, %ebx
shl $3, %ebx
mov $((tss_end - tss) / max_cpus), %edx
imul %edx
add $tss, %eax
mov %ax, tss_descr+2(%ebx)
shr $16, %eax
mov %al, tss_descr+4(%ebx)
shr $8, %eax
mov %al, tss_descr+7(%ebx)
lea tss_descr-gdt32(%ebx), %eax
ltr %ax
ret
smp_init:
cld
lea sipi_entry, %esi
xor %edi, %edi
mov $(sipi_end - sipi_entry), %ecx
rep/movsb
mov $APIC_DEFAULT_PHYS_BASE, %eax
movl $(APIC_DEST_ALLBUT | APIC_DEST_PHYSICAL | APIC_DM_INIT | APIC_INT_ASSERT), APIC_ICR(%eax)
movl $(APIC_DEST_ALLBUT | APIC_DEST_PHYSICAL | APIC_DM_INIT), APIC_ICR(%eax)
movl $(APIC_DEST_ALLBUT | APIC_DEST_PHYSICAL | APIC_DM_STARTUP), APIC_ICR(%eax)
call fwcfg_get_nb_cpus
1: pause
cmpw %ax, cpu_online_count
jne 1b
smp_init_done:
ret
cpu_online_count: .word 1
.code16
sipi_entry:
mov %cr0, %eax
or $1, %eax
mov %eax, %cr0
lgdtl gdt32_descr - sipi_entry
ljmpl $8, $ap_start32
gdt32_descr:
.word gdt32_end - gdt32 - 1
.long gdt32
sipi_end:
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