wip: switch current_pcb and cr3 in switch_thread

headers/thread.h

@@ -24,4 +24,4 @@ struct tcb {
 
 struct tcb *create_thread(struct pcb *process, void (*entry)(void));
 void delete_thread(struct tcb *thread);
-void switch_thread(uint32_t *esp);
+void switch_thread(struct tcb *thread_to_switch);

src/multitasking/scheduler.c

@@ -39,8 +39,6 @@ void scheduler(uint32_t *esp)
 	struct tcb *thread_to_switch = (struct tcb *)list_node->content;
 	if (current_tcb)
 		CURRENT_TCB->esp = esp;
-	if (thread_to_switch->process != current_pcb)
-		switch_process(thread_to_switch->process);
 	current_tcb = list_node;
-	switch_thread(thread_to_switch->esp);
+	switch_thread(thread_to_switch);
 }

src/multitasking/switch_process.s

@@ -1,16 +0,0 @@
-.intel_syntax noprefix
-.extern current_pcb
-
-.section .text
-	.global switch_process
-
-switch_process:
-	// change current_pcb global
-	mov eax, [esp + 4]
-	mov [current_pcb], eax
-	
-	// reload cr3 with the new heap
-	mov edx, [eax + 0]
-	mov cr3, edx
-
-	ret

src/multitasking/switch_to_thread.s

@@ -7,8 +7,20 @@
 switch_thread:
 	
 	mov eax, [esp + 4]
-	mov esp, eax	
+	mov esp, [eax]
 
+	mov edx, [eax + 16]
+	cmp [current_pcb], edx
+	je LABEL1
+	
+	// change current_pcb
+	mov [current_pcb], edx
+	
+	// reload cr3 with the new heap
+	mov edx, [edx]
+	mov cr3, edx
+
+LABEL1:
 	pop eax
 	mov ds, eax