From 056481bedb7141cba93a94c5cf5ba205d9916947 Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Sat, 8 Apr 2023 02:01:58 -0300
Subject: [PATCH] kernel: e9 port output

---
 kernel-src/arch/x86-64/e9.c   | 15 +++++++++++++++
 kernel-src/arch/x86-64/main.c |  3 +++
 kernel-src/include/arch/e9.h  |  7 +++++++
 3 files changed, 25 insertions(+)
 create mode 100644 kernel-src/arch/x86-64/e9.c
 create mode 100644 kernel-src/include/arch/e9.h

diff --git a/kernel-src/arch/x86-64/e9.c b/kernel-src/arch/x86-64/e9.c
new file mode 100644
index 00000000..a292a3a0
--- /dev/null
+++ b/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++);
+	}
+}
diff --git a/kernel-src/arch/x86-64/main.c b/kernel-src/arch/x86-64/main.c
index a08edd24..8f164df7 100644
--- a/kernel-src/arch/x86-64/main.c
+++ b/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");
 }
diff --git a/kernel-src/include/arch/e9.h b/kernel-src/include/arch/e9.h
new file mode 100644
index 00000000..d67bc789
--- /dev/null
+++ b/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