From 16a5b4c9ed410daba848a781f8b8978846c6b836 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 2 Oct 2021 19:48:17 +0000
Subject: implement serial/tty input

---
 src/kernel/arch/i386/tty/serial.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/kernel/arch/i386/tty/serial.c')

diff --git a/src/kernel/arch/i386/tty/serial.c b/src/kernel/arch/i386/tty/serial.c
index 6ddc05b..2b89ecf 100644
--- a/src/kernel/arch/i386/tty/serial.c
+++ b/src/kernel/arch/i386/tty/serial.c
@@ -35,6 +35,11 @@ static void serial_putchar(char c) {
 	port_outb(COM1, c);
 }
 
+char serial_read(void) {
+	while ((port_inb(COM1 + 5) & 0x01) == 0); // wait for DR
+	return port_inb(COM1);
+}
+
 void serial_write(const char *buf, size_t len) {
 	for (size_t i = 0; i < len; i++)
 		serial_putchar(buf[i]);
-- 
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