.intel_syntax noprefix

.section .text
	.global switch_to_task

switch_to_task:
	push ebx
	push ebp
	push edi
	push esi

	// save the current stack pointer to the old stack
	mov [current_task], esp
	mov edi, [eip_backup]
	mov [current_task+16], edi	// save instruction before Interrupt

	// 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 esp, [current_task] // esp
	mov eax, [current_task+4] // esp0
	mov ebx, [current_task+8] // cr3
	mov [TSS+4], eax // tss.esp0
	mov ecx, cr3

	// if cr3 hasn't change, do nothing
	cmp ecx, ebx
	je .END 
//	mov cr3, ebx

	// TODO replace the eip store in stack by the [current_task+16](current_task->eip)  

.END:
	pop esi
	pop edi
	pop ebp
	pop ebx

	ret // this will also change eip to the next task's instructions