Add support to run intel_reg_dumper on OpenBSD.

driver/xf86-video-intel/src/reg_dumper/README.OpenBSD

@@ -0,0 +1,5 @@
+To use the reg dumper program on a running X server you need :
+
+- to build a kernel with 'options INSECURE' and reboot in it
+- to set 'securelevel=-1' in /etc/rc.securelevel
+- to run intel_reg_dumper as root. 

driver/xf86-video-intel/src/reg_dumper/main.c

@@ -34,6 +34,13 @@
 
 #include "reg_dumper.h"
 
+#ifdef __OpenBSD__
+#define DEV_APERTURE "/dev/mem"
+int devMemFd = -1;
+#include <errno.h>
+#include <fcntl.h>
+#endif
+
 int main(int argc, char **argv)
 {
     struct pci_device *dev;
@@ -48,6 +55,15 @@ int main(int argc, char **argv)
 	exit(1);
     }
 
+#ifdef __OpenBSD__
+    devMemFd = open(DEV_APERTURE, O_RDWR);
+    if (devMemFd < 0) {
+	    fprintf(stderr, "Could not open aperture driver: %s\n", strerror(errno));
+	    exit(1);
+    }
+    pci_system_init_dev_mem(devMemFd);
+#endif
+
     /* Grab the graphics card */
     dev = pci_device_find_by_slot(0, 0, 2, 0);
     if (dev == NULL)