.intel_syntax noprefix

.section .text
	.global switch_to_task

switch_to_task:
	push ebx
	push ebp
	push edi
	push esi

	mov eax, [current_task]

	// save the current stack pointer to the old stack
	mov [eax+0], esp

	// stack pointer + the 4 regs pushed
	// and + 1 to get the argument (next task)
	mov esi, [esp+(4+1)*4]
	mov [current_task], esi

	mov eax, [current_task]

	mov esp, [eax+0] // get esp

	mov ecx, [eax+12] // get task's pd
	mov [current_pd], ecx
	mov ecx, [eax+8]
	mov cr3, ecx

	pop esi
	pop edi
	pop ebp
	pop ebx


	mov ecx, 0

	cmp [eax+16], ecx
	je .END

	sti

	push [eax+16] // store func_ptr

	mov [eax+16], ecx // clear eip in current_task

	push 0
	call pic_send_eoi
	pop edx // remove pic_send_eoi argument

	pop edx // get func_ptr
	call edx

	call exit_task

.END:
	ret