Fix hwaccess (again)

I completely forgot about NetBSD in r1638 which was broken since then.
Also, on OpenBSD use iopl again and refine the warning in case we have
insufficient privileges.
Thanks to Jonathan A. Kollasch for his help in getting the details right.

Corresponding to flashrom svn r1695.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>

hwaccess.c

@@ -26,10 +26,9 @@
 #error Unknown architecture
 #endif
 
-#define IS_BSD	(defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) || defined(__OpenBSD__))
 #define IS_LINUX	(defined(__gnu_linux__) || defined(__linux__))
 #define IS_MACOSX	(defined(__APPLE__) && defined(__MACH__))
-#if !(IS_BSD || IS_LINUX || IS_MACOSX || defined(__DJGPP__) || defined(__LIBPAYLOAD__) || defined(__sun))
+#if !(IS_LINUX || IS_MACOSX || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) || defined(__DJGPP__) || defined(__LIBPAYLOAD__) || defined(__sun))
 #error "Unknown operating system"
 #endif
 
@@ -47,7 +46,10 @@
 #include "flash.h"
 #include "hwaccess.h"
 
-#if IS_X86 && IS_BSD
+#define USE_IOPL	(IS_LINUX || IS_MACOSX || defined(__NetBSD__) || defined(__OpenBSD__))
+#define USE_DEV_IO	(defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__))
+
+#if IS_X86 && USE_DEV_IO
 int io_fd;
 #endif
 
@@ -71,9 +73,9 @@ static int release_io_perms(void *p)
 {
 #if defined (__sun)
 	sysi86(SI86V86, V86SC_IOPL, 0);
-#elif IS_BSD
+#elif USE_DEV_IO
 	close(io_fd);
-#elif IS_LINUX || IS_MACOSX
+#elif USE_IOPL
 	iopl(0);
 #endif
 	return 0;
@@ -86,16 +88,19 @@ int rget_io_perms(void)
 #if IS_X86 && !(defined(__DJGPP__) || defined(__LIBPAYLOAD__))
 #if defined (__sun)
 	if (sysi86(SI86V86, V86SC_IOPL, PS_IOPL) != 0) {
-#elif IS_BSD
+#elif USE_DEV_IO
 	if ((io_fd = open("/dev/io", O_RDWR)) < 0) {
-#elif IS_LINUX || IS_MACOSX
+#elif USE_IOPL
 	if (iopl(3) != 0) {
 #endif
-		msg_perr("ERROR: Could not get I/O privileges (%s).\n"
-			"You need to be root.\n", strerror(errno));
+		msg_perr("ERROR: Could not get I/O privileges (%s).\n", strerror(errno));
+		msg_perr("You need to be root.\n");
 #if defined (__OpenBSD__)
-		msg_perr("Please set securelevel=-1 in /etc/rc.securelevel and reboot, or reboot into \n");
-		msg_perr("single user mode.\n");
+		msg_perr("If you are root already please set securelevel=-1 in /etc/rc.securelevel and\n"
+			 "reboot, or reboot into single user mode.\n");
+#elif defined(__NetBSD__)
+		msg_perr("If you are root already please reboot into single user mode or make sure\n"
+			 "that your kernel configuration has the option INSECURE enabled.\n");
 #endif
 		return 1;
 	} else {