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-rw-r--r--i386/i386at/rtc.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/i386/i386at/rtc.h b/i386/i386at/rtc.h
index ced39b9..64a528a 100644
--- a/i386/i386at/rtc.h
+++ b/i386/i386at/rtc.h
@@ -45,6 +45,9 @@ NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
+#ifndef _RTC_H_
+#define _RTC_H_
+
#define RTC_ADDR 0x70 /* I/O port address for register select */
#define RTC_DATA 0x71 /* I/O port address for data read/write */
@@ -136,3 +139,5 @@ struct rtc_st {
extern int readtodc(u_int *tp);
extern int writetodc(void);
+
+#endif /* _RTC_H_ */