The printk(), panic() and kernel.h update

kernel/src/panic.c

@@ -0,0 +1,33 @@
+#include <vsnprintf.h>
+#include <kernel.h>
+#include <stdarg.h>
+#include <system.h>
+
+static int crashing = 0;
+
+void panic(const char *fmt, ...) {
+	va_list ap;
+	va_start(ap, fmt);
+	vpanic(fmt, ap);
+	va_end(ap);
+}
+
+void vpanic(const char *fmt, va_list ap) {
+	static char buf[PANIC_MSG_BUFSZ];
+	size_t len;
+
+	cli();
+
+	if (crashing) { for (;;) __asm__ volatile ("hlt"); }
+	crashing = true;
+
+	len = vsnprintf(buf, sizeof(buf), fmt, ap);
+	if (len && buf[len - 1] == '\n') buf[len - 1] = '\0';
+
+	pr_emerg("--- [ Kernel panic: %s ] ---\n", buf);	
+	//pr_emerg("--- [ End kernel panic: %s ] ---\n", buf);
+
+	// We can add some kind of LED blink or smth later :)
+	for (;;) __asm__ volatile ("hlt");
+}
+