fix: simple multitasking work !!!!

add a stack at every task, and execute task while multitasking switching

src/multitasking/switch_to_task.s

@@ -14,41 +14,40 @@ switch_to_task:
 	// save the current stack pointer to the old stack
 	mov [eax+0], esp
 
-	// save the old eip pointer
-	mov ebx, [[[esp_backup]]]
-	mov [eax+16], ebx
-
 	// 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 edi, [current_task]
+	mov eax, [current_task]
 
-	mov esp, [edi+0] // esp
-	mov eax, [edi+4] // esp0
-//	mov ebx, [edi+8] // cr3
-//	mov edi, [edi+12] // page_directory
-//	mov [page_directory], edi
-//	mov [TSS+4], eax // tss.esp0
-//	mov ecx, cr3
+	mov esp, [eax+0] // get esp
 
-	// if cr3 hasn't change, do nothing
-//	cmp ecx, ebx
-//	je .END 
-//	mov cr3, ebx
-
-
-.END:
-	mov eax, [edi+16]
-	mov ebx, [esp_backup]
-	mov [ebx], eax
-	
 	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
+
+	// TODO HANDLE TASK RETURN
+
+.END:
 	ret