kernel: e9 port output

kernel-src/arch/x86-64/e9.c

@@ -0,0 +1,15 @@
+
+
+#include <arch/io.h>
+
+// TODO compile time options for disabling output to port e9h
+
+void arch_e9_putc(char c) {
+	outb(0xe9, c);
+}
+
+void arch_e9_puts(char *c) {
+	while (*c) {
+		outb(0xe9, *c++);
+	}
+}

kernel-src/arch/x86-64/main.c

@@ -1,4 +1,7 @@
+#include <arch/e9.h>
+
 void kernel_entry() {
+	arch_e9_puts("Hello, world!\n");
 	asm("cli");
 	asm("hlt");
 }

kernel-src/include/arch/e9.h

@@ -0,0 +1,7 @@
+#ifndef _E9_H
+#define _E9_H
+
+void arch_e9_putc(char);
+void arch_e9_puts(char *);
+
+#endif