1 files changed, 106 insertions, 0 deletions
diff --git a/hw/xfree86/os-support/usl/usl_iop.c b/hw/xfree86/os-support/usl/usl_iop.c
new file mode 100644
index 000000000..9f3149b1d
--- /dev/null
+++ b/hw/xfree86/os-support/usl/usl_iop.c
@@ -0,0 +1,106 @@
+/* $XdotOrg$ */
+/*
+ * Copyright 2001-2005 by Kean Johnston <kean.johnston@x.org>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name Kean Johnston not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission.  Kean Johnston makes no
+ * representations about the suitability of this software for any purpose.
+ * It is provided "as is" without express or implied warranty.
+ *
+ * KEAN JOHNSTON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL KEAN JOHNSTON BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+ * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "X.h"
+
+#include "compiler.h"
+
+#define _NEED_SYSI86
+#include "xf86.h"
+#include "xf86Priv.h"
+#include "xf86OSpriv.h"
+#include "xf86_OSlib.h"
+
+
+/***************************************************************************/
+/* I/O Permissions section                                                 */
+/***************************************************************************/
+
+static Bool IOEnabled = FALSE;
+
+Bool xf86EnableIO(void)
+{
+  if (IOEnabled)
+    return TRUE;
+
+  if (sysi86(SI86IOPL, 3) < 0) {
+    xf86Msg (X_WARNING, "Failed to set IOPL for extended I/O\n");
+    return FALSE;
+  }
+
+  IOEnabled = TRUE;
+
+  return TRUE;
+}
+
+void xf86DisableIO(void)
+{
+  if (!IOEnabled)
+    return;
+
+  sysi86(SI86IOPL, 0);
+  IOEnabled = FALSE;
+}
+
+/***************************************************************************/
+/* Interrupt Handling section                                              */
+/***************************************************************************/
+
+Bool xf86DisableInterrupts()
+{
+  if (!IOEnabled) {
+    if (sysi86(SI86IOPL, 3) < 0)
+      return FALSE;
+  }
+
+#ifdef __GNUC__
+  __asm__ __volatile__("cli");
+#else 
+  asm("cli");
+#endif /* __GNUC__ */
+
+  if (!IOEnabled) {
+    sysi86(SI86IOPL, 0);
+  }
+
+  return(TRUE);
+}
+
+void xf86EnableInterrupts()
+{
+  if (!IOEnabled) {
+    if (sysi86(SI86IOPL, 3) < 0)
+      return;
+  }
+
+#ifdef __GNUC__
+  __asm__ __volatile__("sti");
+#else 
+  asm("sti");
+#endif /* __GNUC__ */
+
+  if (!IOEnabled) {
+    sysi86(SI86IOPL, 0);
+  }
+}
+