kernel: use mpaland printf

kernel-src/include/logging.h

@@ -0,0 +1,18 @@
+#ifndef _LOGGING_H
+#define _LOGGING_H
+
+#include <printf.h>
+
+void _putchar(char c);
+void logging_sethook(void (*fun)(char));
+
+// TODO panic
+
+#define __assert(x) \
+	if (!(x)){ \
+		printf("%s:%s:%d: %s failed\n", __FILE__, __func__, __LINE__, #x); \
+		for(;;); \
+	};
+
+
+#endif