Signed-off-by: Anthony Liguori <aliguori@xxxxxxxxxx>
diff --git a/lib/x86/io.h b/lib/x86/io.h
new file mode 100644
index 0000000..bd6341c
--- /dev/null
+++ b/lib/x86/io.h
@@ -0,0 +1,40 @@
+#ifndef IO_H
+#define IO_H
+
+static inline unsigned char inb(unsigned short port)
+{
+ unsigned char value;
+ asm volatile("inb %w1, %0" : "=a" (value) : "Nd" (port));
+ return value;
+}
+
+static inline unsigned short inw(unsigned short port)
+{
+ unsigned short value;
+ asm volatile("inw %w1, %0" : "=a" (value) : "Nd" (port));
+ return value;
+}
+
+static inline unsigned int inl(unsigned short port)
+{
+ unsigned int value;
+ asm volatile("inl %w1, %0" : "=a" (value) : "Nd" (port));
+ return value;
+}
+
+static inline void outb(unsigned char value, unsigned short port)
+{
+ asm volatile("outb %b0, %w1" : : "a"(value), "Nd"(port));
+}
+
+static inline void outw(unsigned short value, unsigned short port)
+{
+ asm volatile("outw %w0, %w1" : : "a"(value), "Nd"(port));
+}
+
+static inline void outl(unsigned int value, unsigned short port)
+{
+ asm volatile("outl %0, %w1" : : "a"(value), "Nd"(port));
+}
+
+#endif
--
1.7.0.4
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