1 files changed, 60 insertions, 0 deletions
diff --git a/src/arch/x86/include/bits/ns16550.h b/src/arch/x86/include/bits/ns16550.h
new file mode 100644
index 000000000..dbb1cd51c
--- /dev/null
+++ b/src/arch/x86/include/bits/ns16550.h
@@ -0,0 +1,60 @@
+#ifndef _BITS_NS16550_H
+#define _BITS_NS16550_H
+
+/** @file
+ *
+ * 16550-compatible UART
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+#include <ipxe/io.h>
+
+/**
+ * Write to UART register
+ *
+ * @v ns16550		16550 UART
+ * @v address		Register address
+ * @v data		Data
+ */
+static inline __attribute__ (( always_inline )) void
+ns16550_write ( struct ns16550_uart *ns16550, unsigned int address,
+		uint8_t data ) {
+
+	iowrite8 ( data, ( ns16550->base + address ) );
+}
+
+/**
+ * Read from UART register
+ *
+ * @v ns16550		16550 UART
+ * @v address		Register address
+ * @ret data		Data
+ */
+static inline __attribute__ (( always_inline )) uint8_t
+ns16550_read ( struct ns16550_uart *ns16550, unsigned int address ) {
+
+	return ioread8 ( ns16550->base + address );
+}
+
+/* Fixed ISA serial port base addresses */
+#define COM1_BASE 0x3f8
+#define COM2_BASE 0x2f8
+#define COM3_BASE 0x3e8
+#define COM4_BASE 0x2e8
+
+/* Fixed ISA serial ports */
+extern struct uart com1;
+extern struct uart com2;
+extern struct uart com3;
+extern struct uart com4;
+
+/* Fixed ISA serial port names */
+#define COM1 &com1
+#define COM2 &com2
+#define COM3 &com3
+#define COM4 &com4
+
+#endif /* _BITS_NS16550_H */