initgraph, whole lot of refactor

core/clock.c

@@ -1,3 +1,5 @@
+#define pr_fmt(fmt) "clock: " fmt
+
 #include <zinnia/clock.h>
 #include <zinnia/compiler.h>
 #include <zinnia/print.h>
@@ -47,14 +49,14 @@ bool clock_switch(struct clock* clock) {
 
     spin_unlock(&lock);
 
-    log("clock: Switching to clock source \"%s\"\n", clock->name);
+    log("Switching to clock source \"%s\"\n", clock->name);
 
     return true;
 }
 
 void clock_spin_ns(uint64_t ns) {
     if (!clock_available()) {
-        log("clock: Unable to sleep for %lu ns, no clock available!\n", ns);
+        log_err("Unable to sleep for %lu ns, no clock available!\n", ns);
         return;
     }