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.section .apinit, "a"
.SET stack_top, 0x3008000
.SET stack_off, 0x8000
.code16
ap_trampoline:
cli
cld
ljmp $0, $_start16
.align 16
gdt32:
.long 0, 0
.long 0x0000FFFF, 0x00CF9A00 # flat code
.long 0x0000FFFF, 0x008F9200 # flat data
.long 0x00000068, 0x00CF8900 # tss
gdt32p:
.word gdt32p - gdt32 - 1
.long 0x8010
.long 0, 0
.align 64
_start16:
xorw %ax, %ax
movw %ax, %ds
lgdtl gdt32p
movl %cr0, %eax
orl $1, %eax
movl %eax, %cr0
ljmp $8, $_start32
.align 32
.code32
_start32:
movw $16, %ax
movw %ax, %ds
movw %ax, %ss
# get our Local APIC ID
mov $1, %eax
cpuid
shrl $24, %ebx
movl %ebx, %edi
# set up 32k stack, one for each core. It is important that all core must have its own stack
movl $stack_top, %esp
movl %ebx, %ecx
22:
addl $stack_off, %esp
decl %ecx
cmp $0, %ecx
jne 22b
call enable_paging
lgdt gdtp
# jump into C code (should never return)
ljmp $8, $_start64
.set KERNEL_VMA, 0xffffffff80000000
.align 64
.code64
_start64:
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %ss
mov %ax, %fs
mov %ax, %gs
add $KERNEL_VMA, %rsp
movabs $_higher_half, %rax
jmp *%rax
.section .text
_higher_half:
call ap_startup
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