Fixed the FS/GS save/restore problem

[palacios.git] / palacios / src / geekos / io.c

diff --git a/palacios/src/geekos/io.c b/palacios/src/geekos/io.c
index 3132733..1310cdc 100644 (file)
--- a/palacios/src/geekos/io.c
+++ b/palacios/src/geekos/io.c
@@ -1,7 +1,7 @@
 /*
  * x86 port IO routines
  * Copyright (c) 2001, David H. Hovemeyer <daveho@cs.umd.edu>
- * $Revision: 1.1 $
+ * $Revision: 1.2 $
  * 
  * This is free software.  You are permitted to use,
  * redistribute, and modify it as specified in the file "COPYING".
@@ -50,7 +50,7 @@ void Out_Word(ushort_t port, ushort_t value)
 }
 
 /*
- * Read a byte from an I/O port.
+ * Read a word from an I/O port.
  */
 ushort_t In_Word(ushort_t port)
 {
@@ -66,6 +66,34 @@ ushort_t In_Word(ushort_t port)
 }
 
 /*
+ * Write a double word to an I/O port.
+ */
+void Out_DWord(ushort_t port, uint_t value)
+{
+    __asm__ __volatile__ (
+       "outl %0, %1"
+       :
+       : "a" (value), "Nd" (port)
+    );
+}
+
+/*
+ * Read a double word from an I/O port.
+ */
+uint_t In_DWord(ushort_t port)
+{
+    uint_t value;
+
+    __asm__ __volatile__ (
+       "inl %1, %0"
+       : "=a" (value)
+       : "Nd" (port)
+    );
+
+    return value;
+}
+
+/*
  * Short delay.  May be needed when talking to some
  * (slow) I/O devices.
  */