kernel: add panic() function that accepts a cpu_context

kernel/panic.c

@@ -7,7 +7,7 @@
 
 static int has_panicked = 0;
 
-void panic(const char *fmt, ...)
+void panic_irq(struct cpu_context *ctx, const char *fmt, ...)
 {
 	char buf[512];
 	va_list args;
@@ -29,7 +29,7 @@ void panic(const char *fmt, ...)
 
 	printk("cpu: %u", this_cpu());
 
-	ml_print_cpu_state(NULL);
+	ml_print_cpu_state(ctx);
 
 	if (READ_ONCE(has_panicked)) {
 		ml_halt_cpu();