From 38d1712e31e60de9f2afe85873b2174e002e3e99 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 26 Mar 2022 21:06:07 +0100
Subject: kernel: IRQs; PS/2 keyboard support

---
 src/kernel/arch/i386/tty/serial.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(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 f9bb252..e77ff5c 100644
--- a/src/kernel/arch/i386/tty/serial.c
+++ b/src/kernel/arch/i386/tty/serial.c
@@ -35,9 +35,11 @@ static void serial_putchar(char c) {
 	port_out8(COM1, c);
 }
 
-char serial_read(void) {
-	while ((port_in8(COM1 + 5) & 0x01) == 0); // wait for DR
-	return port_in8(COM1);
+bool serial_poll_read(char *c) {
+	if ((port_in8(COM1 + 5) & 0x01) == 0) // needs DR
+		return false;
+	*c = port_in8(COM1);
+	return true;
 }
 
 void serial_write(const char *buf, size_t len) {
-- 
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