1 files changed, 41 insertions, 0 deletions
diff --git a/src/arch/x86/include/bits/uart.h b/src/arch/x86/include/bits/uart.h
new file mode 100644
index 00000000..e09cd3f4
--- /dev/null
+++ b/src/arch/x86/include/bits/uart.h
@@ -0,0 +1,41 @@
+#ifndef _BITS_UART_H
+#define _BITS_UART_H
+
+/** @file
+ *
+ * 16550-compatible UART
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+#include <ipxe/io.h>
+
+/**
+ * Write to UART register
+ *
+ * @v uart		UART
+ * @v addr		Register address
+ * @v data		Data
+ */
+static inline __attribute__ (( always_inline )) void
+uart_write ( struct uart *uart, unsigned int addr, uint8_t data ) {
+	outb ( data, ( uart->base + addr ) );
+}
+
+/**
+ * Read from UART register
+ *
+ * @v uart		UART
+ * @v addr		Register address
+ * @ret data		Data
+ */
+static inline __attribute__ (( always_inline )) uint8_t
+uart_read ( struct uart *uart, unsigned int addr ) {
+	return inb ( uart->base + addr );
+}
+
+extern int uart_select ( struct uart *uart, unsigned int port );
+
+#endif /* _BITS_UART_H */