wip: scheduler needs to change eip or smth in order to call the fn

src/multitasking/scheduler.c

@@ -1,10 +1,14 @@
+#include "kprintf.h"
 #include "task.h"
 
 struct task *current_task;
 
 void scheduler(void)
 {
-	struct task *it = current_task->next;
+	kprintf("camille mon bebou\n");
+	if (!current_task)
+		return;
+	struct task *it = current_task;
 	while (it->status != RUN)
 		it = it->next;
 	switch_to_task(it);

src/multitasking/switch_to_task.s

@@ -16,11 +16,11 @@ switch_to_task:
 	// and + 1 to get the argument (next task)
 	mov esi, [esp+(4+1)*4]
 	mov [current_task], esi
-	
-	mov esp, [current_task]
-	mov eax, [current_task+4]
-	mov ebx, [current_task+8]
-	mov [TSS + 4], eax
+
+	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
@@ -34,4 +34,4 @@ switch_to_task:
 	pop ebp
 	pop ebx
 
-	ret
+	ret // this will also change eip to the next task's instructions

src/multitasking/task.c

@@ -0,0 +1,45 @@
+#include "task.h"
+#include "alloc.h"
+#include "kpanic.h"
+#include "memory.h"
+
+static void set_eip(void (*fn)(void), struct task *task)
+{
+	// TODO or not TODO
+}
+
+static struct task *create_task(uint8_t owner_id)
+{
+	static uint32_t pid = 1;
+	struct task *new_task = vmalloc(sizeof(struct task));
+	if (!new_task)
+		return NULL;
+	new_task->owner_id = owner_id;
+	new_task->pid = pid++;
+	new_task->heap = alloc_pages(4096, (void **)&new_task->cr3);
+	if (!new_task->heap) {
+		vfree(new_task);
+		return NULL;
+	}
+	return new_task;
+}
+
+void exec_fn(void (*fn)(void))
+{
+	struct task *new_task = create_task(OWNER_KERNEL);
+	if (!new_task)
+		kpanic("failed to create new task");
+	new_task->status = RUN;
+	new_task->next = current_task;
+	new_task->prev = current_task->prev;
+	current_task->prev = new_task;
+	current_task = new_task;
+	set_eip(fn, new_task);
+}
+
+/*
+ * Create task
+ * Allocate new pd => kmalloc(4096)
+ * Add pd address to the struct task
+ *
+ */