CE add mkdir command, implement create_dir () syscall

kernel/syscall/syscall.c

@@ -593,6 +593,30 @@ DEFINE_SYSCALL (sys_kill) {
   return ST_OK;
 }
 
+/* int create_dir (char* path) */
+DEFINE_SYSCALL (sys_create_dir) {
+  uintptr_t uvaddr_path = a1;
+
+  struct limine_hhdm_response* hhdm = limine_hhdm_request.response;
+
+  uintptr_t out_paddr;
+
+  spin_lock (&proc->procgroup->lock);
+  out_paddr = mm_v2p (&proc->procgroup->pd, uvaddr_path);
+  spin_unlock (&proc->procgroup->lock);
+
+  if (out_paddr == 0)
+    return SYSRESULT (-ST_BAD_ADDRESS_SPACE);
+
+  const char* path = (const char*)((uintptr_t)hhdm->offset + out_paddr);
+
+  spin_lock (&proc->lock);
+  int ret = vfs_create_dir (proc, proc->cwv, path);
+  spin_unlock (&proc->lock);
+
+  return SYSRESULT (ret);
+}
+
 static syscall_handler_func_t handler_table[] = {
     [SYS_QUIT] = &sys_quit,
     [SYS_TEST] = &sys_test,
@@ -620,6 +644,7 @@ static syscall_handler_func_t handler_table[] = {
     [SYS_WRITE_FILE] = &sys_write_file,
     [SYS_WAIT_FOR_PID] = &sys_wait_for_pid,
     [SYS_KILL] = &sys_kill,
+    [SYS_CREATE_DIR] = &sys_create_dir,
 };
 
 syscall_handler_func_t syscall_find_handler (int syscall_num) {