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+/*
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
+ * School of Computer Science
+ * Carnegie Mellon University
+ * Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ Copyright 1988, 1989 by Intel Corporation, Santa Clara, California.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appears in all
+copies and that both the copyright notice and this permission notice
+appear in supporting documentation, and that the name of Intel
+not be used in advertising or publicity pertaining to distribution
+of the software without specific, written prior permission.
+
+INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
+IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
+NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#define RTC_ADDR 0x70 /* I/O port address for register select */
+#define RTC_DATA 0x71 /* I/O port address for data read/write */
+
+/*
+ * Register A definitions
+ */
+#define RTC_A 0x0a /* register A address */
+#define RTC_UIP 0x80 /* Update in progress bit */
+#define RTC_DIV0 0x00 /* Time base of 4.194304 MHz */
+#define RTC_DIV1 0x10 /* Time base of 1.048576 MHz */
+#define RTC_DIV2 0x20 /* Time base of 32.768 KHz */
+#define RTC_RATE6 0x06 /* interrupt rate of 976.562 */
+
+/*
+ * Register B definitions
+ */
+#define RTC_B 0x0b /* register B address */
+#define RTC_SET 0x80 /* stop updates for time set */
+#define RTC_PIE 0x40 /* Periodic interrupt enable */
+#define RTC_AIE 0x20 /* Alarm interrupt enable */
+#define RTC_UIE 0x10 /* Update ended interrupt enable */
+#define RTC_SQWE 0x08 /* Square wave enable */
+#define RTC_DM 0x04 /* Date mode, 1 = binary, 0 = BCD */
+#define RTC_HM 0x02 /* hour mode, 1 = 24 hour, 0 = 12 hour */
+#define RTC_DSE 0x01 /* Daylight savings enable */
+
+/*
+ * Register C definitions
+ */
+#define RTC_C 0x0c /* register C address */
+#define RTC_IRQF 0x80 /* IRQ flag */
+#define RTC_PF 0x40 /* PF flag bit */
+#define RTC_AF 0x20 /* AF flag bit */
+#define RTC_UF 0x10 /* UF flag bit */
+
+/*
+ * Register D definitions
+ */
+#define RTC_D 0x0d /* register D address */
+#define RTC_VRT 0x80 /* Valid RAM and time bit */
+
+#define RTC_NREG 0x0e /* number of RTC registers */
+#define RTC_NREGP 0x0a /* number of RTC registers to set time */
+
+#define RTCRTIME _IOR('c', 0x01, struct rtc_st) /* Read time from RTC */
+#define RTCSTIME _IOW('c', 0x02, struct rtc_st) /* Set time into RTC */
+
+struct rtc_st {
+ char rtc_sec;
+ char rtc_asec;
+ char rtc_min;
+ char rtc_amin;
+ char rtc_hr;
+ char rtc_ahr;
+ char rtc_dow;
+ char rtc_dom;
+ char rtc_mon;
+ char rtc_yr;
+ char rtc_statusa;
+ char rtc_statusb;
+ char rtc_statusc;
+ char rtc_statusd;
+};
+
+/*
+ * this macro reads contents of real time clock to specified buffer
+ */
+#define load_rtc(regs) \
+{\
+ register int i; \
+ \
+ for (i = 0; i < RTC_NREG; i++) { \
+ outb(RTC_ADDR, i); \
+ regs[i] = inb(RTC_DATA); \
+ } \
+}
+
+/*
+ * this macro writes contents of specified buffer to real time clock
+ */
+#define save_rtc(regs) \
+{ \
+ register int i; \
+ for (i = 0; i < RTC_NREGP; i++) { \
+ outb(RTC_ADDR, i); \
+ outb(RTC_DATA, regs[i]);\
+ } \
+}
+
+