src/kernel/arch/amd64/boot64.s


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.global boot64
boot64:
	lgdt (lgdt_arg) // try reloading gdt again
	mov $(5 << 3 | 3), %ax // SEG_TSS
	ltr %ax

	xchgw %bx, %bx
	push %rdi // preserve multiboot struct
	call sysenter_setup
	pop %rdi

	// multiboot struct in %rdi
	jmp kmain_early