From 31767b532e69c5a63df0106fa08e137e3106a449 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Thu, 7 May 2020 00:16:52 +0200
Subject: Some fixes here and there...

Also implemented serial console in userspace
---
 src/userspace/libc/stdio/putch.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

(limited to 'src/userspace/libc/stdio')

diff --git a/src/userspace/libc/stdio/putch.c b/src/userspace/libc/stdio/putch.c
index f87680e..2dad6dc 100644
--- a/src/userspace/libc/stdio/putch.c
+++ b/src/userspace/libc/stdio/putch.c
@@ -1,8 +1,22 @@
 #include <syscall.h>
 
+int is_transmit_empty()
+{
+	u8 value;
+	asm volatile("inb %1, %0" : "=a"(value) : "Nd"(0x3f8 + 5));
+	return value & 0x20;
+}
+
 void putch(char ch)
+{
+	while (is_transmit_empty() == 0)
+		;
+	asm volatile("outb %0, %1" ::"a"(ch), "Nd"(0x3f8));
+}
+
+/*void putch(char ch)
 {
 	// TODO: Implement framebuffer writing
 	//if (ch != 0)
 	//syscall_putch(ch);
-}
\ No newline at end of file
+}*/
\ No newline at end of file
-- 
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