initial import of armv8-hello

hello.c

@@ -0,0 +1,14 @@
+#include "reg.h"
+
+int puts(const char *str)
+{
+	while (*str)
+		*((unsigned int *) UART_BASE) = *str++;
+	return 0;
+}
+
+void main(void)
+{
+	puts("Hello\n");
+	while (1);
+}