syscalls: start adding exit syscall, not done yet

include/paging.h

@@ -39,6 +39,7 @@ uint32_t* get_page_dir();
 void set_page_dir(uint32_t new_page_dir);
 uint32_t phys_to_virt(uint32_t phys);
 uint32_t* create_page_dir();
+void destroy_page_dir(uint32_t* page_dir);
 
 //page_alloc.c
 void set_bit(uint32_t page_index);

include/stdio.h

@@ -14,7 +14,7 @@ int printf(const char* __restrict, ...);
 int putchar(int);
 int puts(const char*);
 
-//#define KATAU_DEBUG
+#define KATAU_DEBUG
 
 #ifdef KATAU_DEBUG
 #define debug_log printf

include/task.h

@@ -68,10 +68,12 @@ typedef struct Process
 extern Process* current;
 
 Process* task_create(uint32_t func, uint32_t user_esp, uint32_t ring, uint32_t* pagedir);
+void     task_kill(Process* proc);
+void     task_exit();
+
 void     scheduler_init();
 void     schedule();
 void     scheduler_lock();
 void     scheduler_unlock();
-void     handle_syscall(TrapFrame *tf);
 
 #endif