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.global boot64
boot64:
lgdt (GdtPointer) // try reloading gdt again
mov $(6 << 3 | 3), %ax // SEG_TSS
ltr %ax
push %rdi // preserve multiboot struct
call sysenter_setup
pop %rdi
// multiboot struct in %rdi
jmp kmain_early
.section .shared
/* https://wiki.osdev.org/Task_State_Segment#Long_Mode */
.global TSS
.align 8
TSS:
.4byte 0 /* reserved */
.rept 3
.8byte _isr_mini_stack /* stacks for privilege level changes */
.endr
.8byte 0 /* reserved */
.rept 7
.8byte _isr_mini_stack /* IST - stack pointer loaded for interrupts */
.endr
.8byte 0 /* reserved */
.4byte 0 /* reserved + IOPB (unused) */
.if . - TSS != 104
.error "bad tss size"
.abort
.endif
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