1 files changed, 91 insertions, 0 deletions
diff --git a/include/hw/rtc/mc146818rtc_regs.h b/include/hw/rtc/mc146818rtc_regs.h
new file mode 100644
index 0000000000..dd6c09e2fc
--- /dev/null
+++ b/include/hw/rtc/mc146818rtc_regs.h
@@ -0,0 +1,91 @@
+/*
+ * QEMU MC146818 RTC emulation
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef HW_RTC_MC146818RTC_REGS_H
+#define HW_RTC_MC146818RTC_REGS_H
+
+#include "qemu/timer.h"
+#include "qemu/host-utils.h"
+
+#define RTC_ISA_IRQ 8
+
+#define RTC_SECONDS             0
+#define RTC_SECONDS_ALARM       1
+#define RTC_MINUTES             2
+#define RTC_MINUTES_ALARM       3
+#define RTC_HOURS               4
+#define RTC_HOURS_ALARM         5
+#define RTC_ALARM_DONT_CARE    0xC0
+
+#define RTC_DAY_OF_WEEK         6
+#define RTC_DAY_OF_MONTH        7
+#define RTC_MONTH               8
+#define RTC_YEAR                9
+
+#define RTC_REG_A               10
+#define RTC_REG_B               11
+#define RTC_REG_C               12
+#define RTC_REG_D               13
+
+/* PC cmos mappings */
+#define RTC_CENTURY              0x32
+#define RTC_IBM_PS2_CENTURY_BYTE 0x37
+
+#define REG_A_UIP 0x80
+
+#define REG_B_SET  0x80
+#define REG_B_PIE  0x40
+#define REG_B_AIE  0x20
+#define REG_B_UIE  0x10
+#define REG_B_SQWE 0x08
+#define REG_B_DM   0x04
+#define REG_B_24H  0x02
+
+#define REG_C_UF   0x10
+#define REG_C_IRQF 0x80
+#define REG_C_PF   0x40
+#define REG_C_AF   0x20
+#define REG_C_MASK 0x70
+
+static inline uint32_t periodic_period_to_clock(int period_code)
+{
+    if (!period_code) {
+        return 0;
+   }
+
+    if (period_code <= 2) {
+        period_code += 7;
+    }
+    /* period in 32 Khz cycles */
+   return 1 << (period_code - 1);
+}
+
+#define RTC_CLOCK_RATE            32768
+
+static inline int64_t periodic_clock_to_ns(int64_t clocks)
+{
+    return muldiv64(clocks, NANOSECONDS_PER_SECOND, RTC_CLOCK_RATE);
+}
+
+#endif