From 1686173757af4e453e7a32d152ec4bd20d789652 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Sat, 1 Aug 2020 18:37:15 +0200
Subject: Started multitasking

---
 apps/b.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 apps/b.c

(limited to 'apps/b.c')

diff --git a/apps/b.c b/apps/b.c
new file mode 100644
index 0000000..3de20bf
--- /dev/null
+++ b/apps/b.c
@@ -0,0 +1,46 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#include <def.h>
+
+u32 strlen(const char *s)
+{
+	const char *ss = s;
+	while (*ss)
+		ss++;
+	return ss - s;
+}
+
+u8 inb(u16 port)
+{
+	u8 value;
+	__asm__ volatile("inb %1, %0" : "=a"(value) : "Nd"(port));
+	return value;
+}
+
+void outb(u16 port, u8 data)
+{
+	__asm__ volatile("outb %0, %1" ::"a"(data), "Nd"(port));
+}
+
+int is_transmit_empty()
+{
+	return inb(0x3f8 + 5) & 0x20;
+}
+
+void serial_put(char ch)
+{
+	while (is_transmit_empty() == 0)
+		;
+	outb(0x3f8, (u8)ch);
+}
+
+void serial_print(const char *data)
+{
+	for (u32 i = 0; i < strlen(data); i++)
+		serial_put(data[i]);
+}
+
+void main()
+{
+	serial_print("b");
+}
-- 
cgit v1.2.3