1 files changed, 48 insertions, 0 deletions
diff --git a/apps/root.c b/apps/root.c
new file mode 100644
index 0000000..e7cbf4e
--- /dev/null
+++ b/apps/root.c
@@ -0,0 +1,48 @@
+// 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("root loaded\n");
+	while (1) {
+	};
+}