1 files changed, 55 insertions, 0 deletions
diff --git a/contrib/libdha/sysdep/pci_os2.c b/contrib/libdha/sysdep/pci_os2.c
new file mode 100644
index 000000000..ddfc0c0ea
--- /dev/null
+++ b/contrib/libdha/sysdep/pci_os2.c
@@ -0,0 +1,55 @@
+/*
+   This file is based on:
+   $XFree86: xc/programs/Xserver/hw/xfree86/etc/scanpci.c,v 3.34.2.17 1998/11/10 11:55:40 dawes Exp $
+   Modified for readability by Nick Kurshev
+*/
+#define INCL_DOSFILEMGR
+#include <os2.h>
+
+static USHORT callgate[3] = {0,0,0};
+
+static __inline__ int enable_os_io(void)
+{
+	HFILE hfd;
+	ULONG dlen,action;
+	APIRET rc;
+	static char *ioDrvPath = "/dev/fastio$";
+ 
+	if (DosOpen((PSZ)ioDrvPath, (PHFILE)&hfd, (PULONG)&action,
+	   (ULONG)0, FILE_SYSTEM, FILE_OPEN,
+	   OPEN_SHARE_DENYNONE|OPEN_FLAGS_NOINHERIT|OPEN_ACCESS_READONLY,
+	   (ULONG)0) != 0) {
+		fprintf(stderr,"Error opening fastio$ driver...\n");
+		fprintf(stderr,"Please install xf86sup.sys in config.sys!\n");
+		return(42);
+	}
+	callgate[0] = callgate[1] = 0;
+ 
+/* Get callgate from driver for fast io to ports and other stuff */
+ 
+	rc = DosDevIOCtl(hfd, (ULONG)0x76, (ULONG)0x64,
+		NULL, 0, NULL,
+		(ULONG*)&callgate[2], sizeof(USHORT), &dlen);
+	if (rc) {
+		fprintf(stderr,"xf86-OS/2: EnableIOPorts failed, rc=%d, dlen=%d; emergency exit\n",
+			rc,dlen);
+		DosClose(hfd);
+		return(42);
+	}
+ 
+/* Calling callgate with function 13 sets IOPL for the program */
+ 
+	asm volatile ("movl $13,%%ebx;.byte 0xff,0x1d;.long _callgate"
+			: /*no outputs */
+			: /*no inputs */
+			: "eax","ebx","ecx","edx","cc");
+ 
+        DosClose(hfd);
+	return(0);
+}
+
+static __inline__ int disable_os_io(void)
+{
+/* Nothing to do */
+        return(0);
+}