hw: Move MC146818 device from hw/timer/ to hw/rtc/ subdirectory

The MC146818 is a Real Time Clock, not a timer.
Move it under the hw/rtc/ subdirectory.

Use copyright statement from 80cabfad163 for "hw/rtc/mc146818rtc.h".

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20191003230404.19384-4-philmd@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

4 files changed, 1 insertions, 1069 deletions

diff --git a/hw/timer/Kconfig b/hw/timer/Kconfig
index 27c5dce..af415c8 100644
--- a/hw/timer/Kconfig
+++ b/hw/timer/Kconfig
@@ -35,9 +35,6 @@ config ALTERA_TIMER
     bool
     select PTIMER
 
-config MC146818RTC
-    bool
-
 config ALLWINNER_A10_PIT
     bool
     select PTIMER
diff --git a/hw/timer/Makefile.objs b/hw/timer/Makefile.objs
index 9f64f6e..b015918 100644
--- a/hw/timer/Makefile.objs
+++ b/hw/timer/Makefile.objs
@@ -35,8 +35,6 @@ common-obj-$(CONFIG_SH4) += sh_timer.o
 common-obj-$(CONFIG_DIGIC) += digic-timer.o
 common-obj-$(CONFIG_MIPS_CPS) += mips_gictimer.o
 
-obj-$(CONFIG_MC146818RTC) += mc146818rtc.o
-
 common-obj-$(CONFIG_ALLWINNER_A10_PIT) += allwinner-a10-pit.o
 
 common-obj-$(CONFIG_STM32F2XX_TIMER) += stm32f2xx_timer.o
diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c
index 1ddae4e..02bf8a8 100644
--- a/hw/timer/hpet.c
+++ b/hw/timer/hpet.c
@@ -33,7 +33,7 @@
 #include "qemu/timer.h"
 #include "hw/timer/hpet.h"
 #include "hw/sysbus.h"
-#include "hw/timer/mc146818rtc.h"
+#include "hw/rtc/mc146818rtc.h"
 #include "migration/vmstate.h"
 #include "hw/timer/i8254.h"
 
diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c
deleted file mode 100644
index 6cb3787..0000000
--- a/hw/timer/mc146818rtc.c
+++ /dev/null
@@ -1,1063 +0,0 @@
-/*
- * 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.
- */
-
-#include "qemu/osdep.h"
-#include "qemu-common.h"
-#include "qemu/cutils.h"
-#include "qemu/module.h"
-#include "qemu/bcd.h"
-#include "hw/irq.h"
-#include "hw/qdev-properties.h"
-#include "qemu/timer.h"
-#include "sysemu/sysemu.h"
-#include "sysemu/replay.h"
-#include "sysemu/reset.h"
-#include "sysemu/runstate.h"
-#include "hw/timer/mc146818rtc.h"
-#include "migration/vmstate.h"
-#include "qapi/error.h"
-#include "qapi/qapi-commands-misc-target.h"
-#include "qapi/qapi-events-misc-target.h"
-#include "qapi/visitor.h"
-#include "exec/address-spaces.h"
-
-#ifdef TARGET_I386
-#include "hw/i386/apic.h"
-#endif
-
-//#define DEBUG_CMOS
-//#define DEBUG_COALESCED
-
-#ifdef DEBUG_CMOS
-# define CMOS_DPRINTF(format, ...)      printf(format, ## __VA_ARGS__)
-#else
-# define CMOS_DPRINTF(format, ...)      do { } while (0)
-#endif
-
-#ifdef DEBUG_COALESCED
-# define DPRINTF_C(format, ...)      printf(format, ## __VA_ARGS__)
-#else
-# define DPRINTF_C(format, ...)      do { } while (0)
-#endif
-
-#define SEC_PER_MIN     60
-#define MIN_PER_HOUR    60
-#define SEC_PER_HOUR    3600
-#define HOUR_PER_DAY    24
-#define SEC_PER_DAY     86400
-
-#define RTC_REINJECT_ON_ACK_COUNT 20
-#define RTC_CLOCK_RATE            32768
-#define UIP_HOLD_LENGTH           (8 * NANOSECONDS_PER_SECOND / 32768)
-
-#define MC146818_RTC(obj) OBJECT_CHECK(RTCState, (obj), TYPE_MC146818_RTC)
-
-typedef struct RTCState {
-    ISADevice parent_obj;
-
-    MemoryRegion io;
-    MemoryRegion coalesced_io;
-    uint8_t cmos_data[128];
-    uint8_t cmos_index;
-    int32_t base_year;
-    uint64_t base_rtc;
-    uint64_t last_update;
-    int64_t offset;
-    qemu_irq irq;
-    int it_shift;
-    /* periodic timer */
-    QEMUTimer *periodic_timer;
-    int64_t next_periodic_time;
-    /* update-ended timer */
-    QEMUTimer *update_timer;
-    uint64_t next_alarm_time;
-    uint16_t irq_reinject_on_ack_count;
-    uint32_t irq_coalesced;
-    uint32_t period;
-    QEMUTimer *coalesced_timer;
-    LostTickPolicy lost_tick_policy;
-    Notifier suspend_notifier;
-    QLIST_ENTRY(RTCState) link;
-} RTCState;
-
-static void rtc_set_time(RTCState *s);
-static void rtc_update_time(RTCState *s);
-static void rtc_set_cmos(RTCState *s, const struct tm *tm);
-static inline int rtc_from_bcd(RTCState *s, int a);
-static uint64_t get_next_alarm(RTCState *s);
-
-static inline bool rtc_running(RTCState *s)
-{
-    return (!(s->cmos_data[RTC_REG_B] & REG_B_SET) &&
-            (s->cmos_data[RTC_REG_A] & 0x70) <= 0x20);
-}
-
-static uint64_t get_guest_rtc_ns(RTCState *s)
-{
-    uint64_t guest_clock = qemu_clock_get_ns(rtc_clock);
-
-    return s->base_rtc * NANOSECONDS_PER_SECOND +
-        guest_clock - s->last_update + s->offset;
-}
-
-static void rtc_coalesced_timer_update(RTCState *s)
-{
-    if (s->irq_coalesced == 0) {
-        timer_del(s->coalesced_timer);
-    } else {
-        /* divide each RTC interval to 2 - 8 smaller intervals */
-        int c = MIN(s->irq_coalesced, 7) + 1;
-        int64_t next_clock = qemu_clock_get_ns(rtc_clock) +
-            periodic_clock_to_ns(s->period / c);
-        timer_mod(s->coalesced_timer, next_clock);
-    }
-}
-
-static QLIST_HEAD(, RTCState) rtc_devices =
-    QLIST_HEAD_INITIALIZER(rtc_devices);
-
-#ifdef TARGET_I386
-void qmp_rtc_reset_reinjection(Error **errp)
-{
-    RTCState *s;
-
-    QLIST_FOREACH(s, &rtc_devices, link) {
-        s->irq_coalesced = 0;
-    }
-}
-
-static bool rtc_policy_slew_deliver_irq(RTCState *s)
-{
-    apic_reset_irq_delivered();
-    qemu_irq_raise(s->irq);
-    return apic_get_irq_delivered();
-}
-
-static void rtc_coalesced_timer(void *opaque)
-{
-    RTCState *s = opaque;
-
-    if (s->irq_coalesced != 0) {
-        s->cmos_data[RTC_REG_C] |= 0xc0;
-        DPRINTF_C("cmos: injecting from timer\n");
-        if (rtc_policy_slew_deliver_irq(s)) {
-            s->irq_coalesced--;
-            DPRINTF_C("cmos: coalesced irqs decreased to %d\n",
-                      s->irq_coalesced);
-        }
-    }
-
-    rtc_coalesced_timer_update(s);
-}
-#else
-static bool rtc_policy_slew_deliver_irq(RTCState *s)
-{
-    assert(0);
-    return false;
-}
-#endif
-
-static uint32_t rtc_periodic_clock_ticks(RTCState *s)
-{
-    int period_code;
-
-    if (!(s->cmos_data[RTC_REG_B] & REG_B_PIE)) {
-        return 0;
-     }
-
-    period_code = s->cmos_data[RTC_REG_A] & 0x0f;
-
-    return periodic_period_to_clock(period_code);
-}
-
-/*
- * handle periodic timer. @old_period indicates the periodic timer update
- * is just due to period adjustment.
- */
-static void
-periodic_timer_update(RTCState *s, int64_t current_time, uint32_t old_period)
-{
-    uint32_t period;
-    int64_t cur_clock, next_irq_clock, lost_clock = 0;
-
-    period = rtc_periodic_clock_ticks(s);
-
-    if (period) {
-        /* compute 32 khz clock */
-        cur_clock =
-            muldiv64(current_time, RTC_CLOCK_RATE, NANOSECONDS_PER_SECOND);
-
-        /*
-        * if the periodic timer's update is due to period re-configuration,
-        * we should count the clock since last interrupt.
-        */
-        if (old_period) {
-            int64_t last_periodic_clock, next_periodic_clock;
-
-            next_periodic_clock = muldiv64(s->next_periodic_time,
-                                    RTC_CLOCK_RATE, NANOSECONDS_PER_SECOND);
-            last_periodic_clock = next_periodic_clock - old_period;
-            lost_clock = cur_clock - last_periodic_clock;
-            assert(lost_clock >= 0);
-        }
-
-        /*
-         * s->irq_coalesced can change for two reasons:
-         *
-         * a) if one or more periodic timer interrupts have been lost,
-         *    lost_clock will be more that a period.
-         *
-         * b) when the period may be reconfigured, we expect the OS to
-         *    treat delayed tick as the new period.  So, when switching
-         *    from a shorter to a longer period, scale down the missing,
-         *    because the OS will treat past delayed ticks as longer
-         *    (leftovers are put back into lost_clock).  When switching
-         *    to a shorter period, scale up the missing ticks since the
-         *    OS handler will treat past delayed ticks as shorter.
-         */
-        if (s->lost_tick_policy == LOST_TICK_POLICY_SLEW) {
-            uint32_t old_irq_coalesced = s->irq_coalesced;
-
-            s->period = period;
-            lost_clock += old_irq_coalesced * old_period;
-            s->irq_coalesced = lost_clock / s->period;
-            lost_clock %= s->period;
-            if (old_irq_coalesced != s->irq_coalesced ||
-                old_period != s->period) {
-                DPRINTF_C("cmos: coalesced irqs scaled from %d to %d, "
-                          "period scaled from %d to %d\n", old_irq_coalesced,
-                          s->irq_coalesced, old_period, s->period);
-                rtc_coalesced_timer_update(s);
-            }
-        } else {
-           /*
-             * no way to compensate the interrupt if LOST_TICK_POLICY_SLEW
-             * is not used, we should make the time progress anyway.
-             */
-            lost_clock = MIN(lost_clock, period);
-        }
-
-        assert(lost_clock >= 0 && lost_clock <= period);
-
-        next_irq_clock = cur_clock + period - lost_clock;
-        s->next_periodic_time = periodic_clock_to_ns(next_irq_clock) + 1;
-        timer_mod(s->periodic_timer, s->next_periodic_time);
-    } else {
-        s->irq_coalesced = 0;
-        timer_del(s->periodic_timer);
-    }
-}
-
-static void rtc_periodic_timer(void *opaque)
-{
-    RTCState *s = opaque;
-
-    periodic_timer_update(s, s->next_periodic_time, 0);
-    s->cmos_data[RTC_REG_C] |= REG_C_PF;
-    if (s->cmos_data[RTC_REG_B] & REG_B_PIE) {
-        s->cmos_data[RTC_REG_C] |= REG_C_IRQF;
-        if (s->lost_tick_policy == LOST_TICK_POLICY_SLEW) {
-            if (s->irq_reinject_on_ack_count >= RTC_REINJECT_ON_ACK_COUNT)
-                s->irq_reinject_on_ack_count = 0;
-            if (!rtc_policy_slew_deliver_irq(s)) {
-                s->irq_coalesced++;
-                rtc_coalesced_timer_update(s);
-                DPRINTF_C("cmos: coalesced irqs increased to %d\n",
-                          s->irq_coalesced);
-            }
-        } else
-            qemu_irq_raise(s->irq);
-    }
-}
-
-/* handle update-ended timer */
-static void check_update_timer(RTCState *s)
-{
-    uint64_t next_update_time;
-    uint64_t guest_nsec;
-    int next_alarm_sec;
-
-    /* From the data sheet: "Holding the dividers in reset prevents
-     * interrupts from operating, while setting the SET bit allows"
-     * them to occur.
-     */
-    if ((s->cmos_data[RTC_REG_A] & 0x60) == 0x60) {
-        assert((s->cmos_data[RTC_REG_A] & REG_A_UIP) == 0);
-        timer_del(s->update_timer);
-        return;
-    }
-
-    guest_nsec = get_guest_rtc_ns(s) % NANOSECONDS_PER_SECOND;
-    next_update_time = qemu_clock_get_ns(rtc_clock)
-        + NANOSECONDS_PER_SECOND - guest_nsec;
-
-    /* Compute time of next alarm.  One second is already accounted
-     * for in next_update_time.
-     */
-    next_alarm_sec = get_next_alarm(s);
-    s->next_alarm_time = next_update_time +
-                         (next_alarm_sec - 1) * NANOSECONDS_PER_SECOND;
-
-    /* If update_in_progress latched the UIP bit, we must keep the timer
-     * programmed to the next second, so that UIP is cleared.  Otherwise,
-     * if UF is already set, we might be able to optimize.
-     */
-    if (!(s->cmos_data[RTC_REG_A] & REG_A_UIP) &&
-        (s->cmos_data[RTC_REG_C] & REG_C_UF)) {
-        /* If AF cannot change (i.e. either it is set already, or
-         * SET=1 and then the time is not updated), nothing to do.
-         */
-        if ((s->cmos_data[RTC_REG_B] & REG_B_SET) ||
-            (s->cmos_data[RTC_REG_C] & REG_C_AF)) {
-            timer_del(s->update_timer);
-            return;
-        }
-
-        /* UF is set, but AF is clear.  Program the timer to target
-         * the alarm time.  */
-        next_update_time = s->next_alarm_time;
-    }
-    if (next_update_time != timer_expire_time_ns(s->update_timer)) {
-        timer_mod(s->update_timer, next_update_time);
-    }
-}
-
-static inline uint8_t convert_hour(RTCState *s, uint8_t hour)
-{
-    if (!(s->cmos_data[RTC_REG_B] & REG_B_24H)) {
-        hour %= 12;
-        if (s->cmos_data[RTC_HOURS] & 0x80) {
-            hour += 12;
-        }
-    }
-    return hour;
-}
-
-static uint64_t get_next_alarm(RTCState *s)
-{
-    int32_t alarm_sec, alarm_min, alarm_hour, cur_hour, cur_min, cur_sec;
-    int32_t hour, min, sec;
-
-    rtc_update_time(s);
-
-    alarm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS_ALARM]);
-    alarm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES_ALARM]);
-    alarm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS_ALARM]);
-    alarm_hour = alarm_hour == -1 ? -1 : convert_hour(s, alarm_hour);
-
-    cur_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]);
-    cur_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]);
-    cur_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS]);
-    cur_hour = convert_hour(s, cur_hour);
-
-    if (alarm_hour == -1) {
-        alarm_hour = cur_hour;
-        if (alarm_min == -1) {
-            alarm_min = cur_min;
-            if (alarm_sec == -1) {
-                alarm_sec = cur_sec + 1;
-            } else if (cur_sec > alarm_sec) {
-                alarm_min++;
-            }
-        } else if (cur_min == alarm_min) {
-            if (alarm_sec == -1) {
-                alarm_sec = cur_sec + 1;
-            } else {
-                if (cur_sec > alarm_sec) {
-                    alarm_hour++;
-                }
-            }
-            if (alarm_sec == SEC_PER_MIN) {
-                /* wrap to next hour, minutes is not in don't care mode */
-                alarm_sec = 0;
-                alarm_hour++;
-            }
-        } else if (cur_min > alarm_min) {
-            alarm_hour++;
-        }
-    } else if (cur_hour == alarm_hour) {
-        if (alarm_min == -1) {
-            alarm_min = cur_min;
-            if (alarm_sec == -1) {
-                alarm_sec = cur_sec + 1;
-            } else if (cur_sec > alarm_sec) {
-                alarm_min++;
-            }
-
-            if (alarm_sec == SEC_PER_MIN) {
-                alarm_sec = 0;
-                alarm_min++;
-            }
-            /* wrap to next day, hour is not in don't care mode */
-            alarm_min %= MIN_PER_HOUR;
-        } else if (cur_min == alarm_min) {
-            if (alarm_sec == -1) {
-                alarm_sec = cur_sec + 1;
-            }
-            /* wrap to next day, hours+minutes not in don't care mode */
-            alarm_sec %= SEC_PER_MIN;
-        }
-    }
-
-    /* values that are still don't care fire at the next min/sec */
-    if (alarm_min == -1) {
-        alarm_min = 0;
-    }
-    if (alarm_sec == -1) {
-        alarm_sec = 0;
-    }
-
-    /* keep values in range */
-    if (alarm_sec == SEC_PER_MIN) {
-        alarm_sec = 0;
-        alarm_min++;
-    }
-    if (alarm_min == MIN_PER_HOUR) {
-        alarm_min = 0;
-        alarm_hour++;
-    }
-    alarm_hour %= HOUR_PER_DAY;
-
-    hour = alarm_hour - cur_hour;
-    min = hour * MIN_PER_HOUR + alarm_min - cur_min;
-    sec = min * SEC_PER_MIN + alarm_sec - cur_sec;
-    return sec <= 0 ? sec + SEC_PER_DAY : sec;
-}
-
-static void rtc_update_timer(void *opaque)
-{
-    RTCState *s = opaque;
-    int32_t irqs = REG_C_UF;
-    int32_t new_irqs;
-
-    assert((s->cmos_data[RTC_REG_A] & 0x60) != 0x60);
-
-    /* UIP might have been latched, update time and clear it.  */
-    rtc_update_time(s);
-    s->cmos_data[RTC_REG_A] &= ~REG_A_UIP;
-
-    if (qemu_clock_get_ns(rtc_clock) >= s->next_alarm_time) {
-        irqs |= REG_C_AF;
-        if (s->cmos_data[RTC_REG_B] & REG_B_AIE) {
-            qemu_system_wakeup_request(QEMU_WAKEUP_REASON_RTC, NULL);
-        }
-    }
-
-    new_irqs = irqs & ~s->cmos_data[RTC_REG_C];
-    s->cmos_data[RTC_REG_C] |= irqs;
-    if ((new_irqs & s->cmos_data[RTC_REG_B]) != 0) {
-        s->cmos_data[RTC_REG_C] |= REG_C_IRQF;
-        qemu_irq_raise(s->irq);
-    }
-    check_update_timer(s);
-}
-
-static void cmos_ioport_write(void *opaque, hwaddr addr,
-                              uint64_t data, unsigned size)
-{
-    RTCState *s = opaque;
-    uint32_t old_period;
-    bool update_periodic_timer;
-
-    if ((addr & 1) == 0) {
-        s->cmos_index = data & 0x7f;
-    } else {
-        CMOS_DPRINTF("cmos: write index=0x%02x val=0x%02" PRIx64 "\n",
-                     s->cmos_index, data);
-        switch(s->cmos_index) {
-        case RTC_SECONDS_ALARM:
-        case RTC_MINUTES_ALARM:
-        case RTC_HOURS_ALARM:
-            s->cmos_data[s->cmos_index] = data;
-            check_update_timer(s);
-            break;
-        case RTC_IBM_PS2_CENTURY_BYTE:
-            s->cmos_index = RTC_CENTURY;
-            /* fall through */
-        case RTC_CENTURY:
-        case RTC_SECONDS:
-        case RTC_MINUTES:
-        case RTC_HOURS:
-        case RTC_DAY_OF_WEEK:
-        case RTC_DAY_OF_MONTH:
-        case RTC_MONTH:
-        case RTC_YEAR:
-            s->cmos_data[s->cmos_index] = data;
-            /* if in set mode, do not update the time */
-            if (rtc_running(s)) {
-                rtc_set_time(s);
-                check_update_timer(s);
-            }
-            break;
-        case RTC_REG_A:
-            update_periodic_timer = (s->cmos_data[RTC_REG_A] ^ data) & 0x0f;
-            old_period = rtc_periodic_clock_ticks(s);
-
-            if ((data & 0x60) == 0x60) {
-                if (rtc_running(s)) {
-                    rtc_update_time(s);
-                }
-                /* What happens to UIP when divider reset is enabled is
-                 * unclear from the datasheet.  Shouldn't matter much
-                 * though.
-                 */
-                s->cmos_data[RTC_REG_A] &= ~REG_A_UIP;
-            } else if (((s->cmos_data[RTC_REG_A] & 0x60) == 0x60) &&
-                    (data & 0x70)  <= 0x20) {
-                /* when the divider reset is removed, the first update cycle
-                 * begins one-half second later*/
-                if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
-                    s->offset = 500000000;
-                    rtc_set_time(s);
-                }
-                s->cmos_data[RTC_REG_A] &= ~REG_A_UIP;
-            }
-            /* UIP bit is read only */
-            s->cmos_data[RTC_REG_A] = (data & ~REG_A_UIP) |
-                (s->cmos_data[RTC_REG_A] & REG_A_UIP);
-
-            if (update_periodic_timer) {
-                periodic_timer_update(s, qemu_clock_get_ns(rtc_clock),
-                                      old_period);
-            }
-
-            check_update_timer(s);
-            break;
-        case RTC_REG_B:
-            update_periodic_timer = (s->cmos_data[RTC_REG_B] ^ data)
-                                       & REG_B_PIE;
-            old_period = rtc_periodic_clock_ticks(s);
-
-            if (data & REG_B_SET) {
-                /* update cmos to when the rtc was stopping */
-                if (rtc_running(s)) {
-                    rtc_update_time(s);
-                }
-                /* set mode: reset UIP mode */
-                s->cmos_data[RTC_REG_A] &= ~REG_A_UIP;
-                data &= ~REG_B_UIE;
-            } else {
-                /* if disabling set mode, update the time */
-                if ((s->cmos_data[RTC_REG_B] & REG_B_SET) &&
-                    (s->cmos_data[RTC_REG_A] & 0x70) <= 0x20) {
-                    s->offset = get_guest_rtc_ns(s) % NANOSECONDS_PER_SECOND;
-                    rtc_set_time(s);
-                }
-            }
-            /* if an interrupt flag is already set when the interrupt
-             * becomes enabled, raise an interrupt immediately.  */
-            if (data & s->cmos_data[RTC_REG_C] & REG_C_MASK) {
-                s->cmos_data[RTC_REG_C] |= REG_C_IRQF;
-                qemu_irq_raise(s->irq);
-            } else {
-                s->cmos_data[RTC_REG_C] &= ~REG_C_IRQF;
-                qemu_irq_lower(s->irq);
-            }
-            s->cmos_data[RTC_REG_B] = data;
-
-            if (update_periodic_timer) {
-                periodic_timer_update(s, qemu_clock_get_ns(rtc_clock),
-                                      old_period);
-            }
-
-            check_update_timer(s);
-            break;
-        case RTC_REG_C:
-        case RTC_REG_D:
-            /* cannot write to them */
-            break;
-        default:
-            s->cmos_data[s->cmos_index] = data;
-            break;
-        }
-    }
-}
-
-static inline int rtc_to_bcd(RTCState *s, int a)
-{
-    if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
-        return a;
-    } else {
-        return ((a / 10) << 4) | (a % 10);
-    }
-}
-
-static inline int rtc_from_bcd(RTCState *s, int a)
-{
-    if ((a & 0xc0) == 0xc0) {
-        return -1;
-    }
-    if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
-        return a;
-    } else {
-        return ((a >> 4) * 10) + (a & 0x0f);
-    }
-}
-
-static void rtc_get_time(RTCState *s, struct tm *tm)
-{
-    tm->tm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]);
-    tm->tm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]);
-    tm->tm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
-    if (!(s->cmos_data[RTC_REG_B] & REG_B_24H)) {
-        tm->tm_hour %= 12;
-        if (s->cmos_data[RTC_HOURS] & 0x80) {
-            tm->tm_hour += 12;
-        }
-    }
-    tm->tm_wday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]) - 1;
-    tm->tm_mday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]);
-    tm->tm_mon = rtc_from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
-    tm->tm_year =
-        rtc_from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year +
-        rtc_from_bcd(s, s->cmos_data[RTC_CENTURY]) * 100 - 1900;
-}
-
-static void rtc_set_time(RTCState *s)
-{
-    struct tm tm;
-
-    rtc_get_time(s, &tm);
-    s->base_rtc = mktimegm(&tm);
-    s->last_update = qemu_clock_get_ns(rtc_clock);
-
-    qapi_event_send_rtc_change(qemu_timedate_diff(&tm));
-}
-
-static void rtc_set_cmos(RTCState *s, const struct tm *tm)
-{
-    int year;
-
-    s->cmos_data[RTC_SECONDS] = rtc_to_bcd(s, tm->tm_sec);
-    s->cmos_data[RTC_MINUTES] = rtc_to_bcd(s, tm->tm_min);
-    if (s->cmos_data[RTC_REG_B] & REG_B_24H) {
-        /* 24 hour format */
-        s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, tm->tm_hour);
-    } else {
-        /* 12 hour format */
-        int h = (tm->tm_hour % 12) ? tm->tm_hour % 12 : 12;
-        s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, h);
-        if (tm->tm_hour >= 12)
-            s->cmos_data[RTC_HOURS] |= 0x80;
-    }
-    s->cmos_data[RTC_DAY_OF_WEEK] = rtc_to_bcd(s, tm->tm_wday + 1);
-    s->cmos_data[RTC_DAY_OF_MONTH] = rtc_to_bcd(s, tm->tm_mday);
-    s->cmos_data[RTC_MONTH] = rtc_to_bcd(s, tm->tm_mon + 1);
-    year = tm->tm_year + 1900 - s->base_year;
-    s->cmos_data[RTC_YEAR] = rtc_to_bcd(s, year % 100);
-    s->cmos_data[RTC_CENTURY] = rtc_to_bcd(s, year / 100);
-}
-
-static void rtc_update_time(RTCState *s)
-{
-    struct tm ret;
-    time_t guest_sec;
-    int64_t guest_nsec;
-
-    guest_nsec = get_guest_rtc_ns(s);
-    guest_sec = guest_nsec / NANOSECONDS_PER_SECOND;
-    gmtime_r(&guest_sec, &ret);
-
-    /* Is SET flag of Register B disabled? */
-    if ((s->cmos_data[RTC_REG_B] & REG_B_SET) == 0) {
-        rtc_set_cmos(s, &ret);
-    }
-}
-
-static int update_in_progress(RTCState *s)
-{
-    int64_t guest_nsec;
-
-    if (!rtc_running(s)) {
-        return 0;
-    }
-    if (timer_pending(s->update_timer)) {
-        int64_t next_update_time = timer_expire_time_ns(s->update_timer);
-        /* Latch UIP until the timer expires.  */
-        if (qemu_clock_get_ns(rtc_clock) >=
-            (next_update_time - UIP_HOLD_LENGTH)) {
-            s->cmos_data[RTC_REG_A] |= REG_A_UIP;
-            return 1;
-        }
-    }
-
-    guest_nsec = get_guest_rtc_ns(s);
-    /* UIP bit will be set at last 244us of every second. */
-    if ((guest_nsec % NANOSECONDS_PER_SECOND) >=
-        (NANOSECONDS_PER_SECOND - UIP_HOLD_LENGTH)) {
-        return 1;
-    }
-    return 0;
-}
-
-static uint64_t cmos_ioport_read(void *opaque, hwaddr addr,
-                                 unsigned size)
-{
-    RTCState *s = opaque;
-    int ret;
-    if ((addr & 1) == 0) {
-        return 0xff;
-    } else {
-        switch(s->cmos_index) {
-        case RTC_IBM_PS2_CENTURY_BYTE:
-            s->cmos_index = RTC_CENTURY;
-            /* fall through */
-        case RTC_CENTURY:
-        case RTC_SECONDS:
-        case RTC_MINUTES:
-        case RTC_HOURS:
-        case RTC_DAY_OF_WEEK:
-        case RTC_DAY_OF_MONTH:
-        case RTC_MONTH:
-        case RTC_YEAR:
-            /* if not in set mode, calibrate cmos before
-             * reading*/
-            if (rtc_running(s)) {
-                rtc_update_time(s);
-            }
-            ret = s->cmos_data[s->cmos_index];
-            break;
-        case RTC_REG_A:
-            ret = s->cmos_data[s->cmos_index];
-            if (update_in_progress(s)) {
-                ret |= REG_A_UIP;
-            }
-            break;
-        case RTC_REG_C:
-            ret = s->cmos_data[s->cmos_index];
-            qemu_irq_lower(s->irq);
-            s->cmos_data[RTC_REG_C] = 0x00;
-            if (ret & (REG_C_UF | REG_C_AF)) {
-                check_update_timer(s);
-            }
-
-            if(s->irq_coalesced &&
-                    (s->cmos_data[RTC_REG_B] & REG_B_PIE) &&
-                    s->irq_reinject_on_ack_count < RTC_REINJECT_ON_ACK_COUNT) {
-                s->irq_reinject_on_ack_count++;
-                s->cmos_data[RTC_REG_C] |= REG_C_IRQF | REG_C_PF;
-                DPRINTF_C("cmos: injecting on ack\n");
-                if (rtc_policy_slew_deliver_irq(s)) {
-                    s->irq_coalesced--;
-                    DPRINTF_C("cmos: coalesced irqs decreased to %d\n",
-                              s->irq_coalesced);
-                }
-            }
-            break;
-        default:
-            ret = s->cmos_data[s->cmos_index];
-            break;
-        }
-        CMOS_DPRINTF("cmos: read index=0x%02x val=0x%02x\n",
-                     s->cmos_index, ret);
-        return ret;
-    }
-}
-
-void rtc_set_memory(ISADevice *dev, int addr, int val)
-{
-    RTCState *s = MC146818_RTC(dev);
-    if (addr >= 0 && addr <= 127)
-        s->cmos_data[addr] = val;
-}
-
-int rtc_get_memory(ISADevice *dev, int addr)
-{
-    RTCState *s = MC146818_RTC(dev);
-    assert(addr >= 0 && addr <= 127);
-    return s->cmos_data[addr];
-}
-
-static void rtc_set_date_from_host(ISADevice *dev)
-{
-    RTCState *s = MC146818_RTC(dev);
-    struct tm tm;
-
-    qemu_get_timedate(&tm, 0);
-
-    s->base_rtc = mktimegm(&tm);
-    s->last_update = qemu_clock_get_ns(rtc_clock);
-    s->offset = 0;
-
-    /* set the CMOS date */
-    rtc_set_cmos(s, &tm);
-}
-
-static int rtc_pre_save(void *opaque)
-{
-    RTCState *s = opaque;
-
-    rtc_update_time(s);
-
-    return 0;
-}
-
-static int rtc_post_load(void *opaque, int version_id)
-{
-    RTCState *s = opaque;
-
-    if (version_id <= 2 || rtc_clock == QEMU_CLOCK_REALTIME) {
-        rtc_set_time(s);
-        s->offset = 0;
-        check_update_timer(s);
-    }
-
-    /* The periodic timer is deterministic in record/replay mode,
-     * so there is no need to update it after loading the vmstate.
-     * Reading RTC here would misalign record and replay.
-     */
-    if (replay_mode == REPLAY_MODE_NONE) {
-        uint64_t now = qemu_clock_get_ns(rtc_clock);
-        if (now < s->next_periodic_time ||
-            now > (s->next_periodic_time + get_max_clock_jump())) {
-            periodic_timer_update(s, qemu_clock_get_ns(rtc_clock), 0);
-        }
-    }
-
-    if (version_id >= 2) {
-        if (s->lost_tick_policy == LOST_TICK_POLICY_SLEW) {
-            rtc_coalesced_timer_update(s);
-        }
-    }
-    return 0;
-}
-
-static bool rtc_irq_reinject_on_ack_count_needed(void *opaque)
-{
-    RTCState *s = (RTCState *)opaque;
-    return s->irq_reinject_on_ack_count != 0;
-}
-
-static const VMStateDescription vmstate_rtc_irq_reinject_on_ack_count = {
-    .name = "mc146818rtc/irq_reinject_on_ack_count",
-    .version_id = 1,
-    .minimum_version_id = 1,
-    .needed = rtc_irq_reinject_on_ack_count_needed,
-    .fields = (VMStateField[]) {
-        VMSTATE_UINT16(irq_reinject_on_ack_count, RTCState),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-static const VMStateDescription vmstate_rtc = {
-    .name = "mc146818rtc",
-    .version_id = 3,
-    .minimum_version_id = 1,
-    .pre_save = rtc_pre_save,
-    .post_load = rtc_post_load,
-    .fields = (VMStateField[]) {
-        VMSTATE_BUFFER(cmos_data, RTCState),
-        VMSTATE_UINT8(cmos_index, RTCState),
-        VMSTATE_UNUSED(7*4),
-        VMSTATE_TIMER_PTR(periodic_timer, RTCState),
-        VMSTATE_INT64(next_periodic_time, RTCState),
-        VMSTATE_UNUSED(3*8),
-        VMSTATE_UINT32_V(irq_coalesced, RTCState, 2),
-        VMSTATE_UINT32_V(period, RTCState, 2),
-        VMSTATE_UINT64_V(base_rtc, RTCState, 3),
-        VMSTATE_UINT64_V(last_update, RTCState, 3),
-        VMSTATE_INT64_V(offset, RTCState, 3),
-        VMSTATE_TIMER_PTR_V(update_timer, RTCState, 3),
-        VMSTATE_UINT64_V(next_alarm_time, RTCState, 3),
-        VMSTATE_END_OF_LIST()
-    },
-    .subsections = (const VMStateDescription*[]) {
-        &vmstate_rtc_irq_reinject_on_ack_count,
-        NULL
-    }
-};
-
-/* set CMOS shutdown status register (index 0xF) as S3_resume(0xFE)
-   BIOS will read it and start S3 resume at POST Entry */
-static void rtc_notify_suspend(Notifier *notifier, void *data)
-{
-    RTCState *s = container_of(notifier, RTCState, suspend_notifier);
-    rtc_set_memory(ISA_DEVICE(s), 0xF, 0xFE);
-}
-
-static void rtc_reset(void *opaque)
-{
-    RTCState *s = opaque;
-
-    s->cmos_data[RTC_REG_B] &= ~(REG_B_PIE | REG_B_AIE | REG_B_SQWE);
-    s->cmos_data[RTC_REG_C] &= ~(REG_C_UF | REG_C_IRQF | REG_C_PF | REG_C_AF);
-    check_update_timer(s);
-
-    qemu_irq_lower(s->irq);
-
-    if (s->lost_tick_policy == LOST_TICK_POLICY_SLEW) {
-        s->irq_coalesced = 0;
-        s->irq_reinject_on_ack_count = 0;
-    }
-}
-
-static const MemoryRegionOps cmos_ops = {
-    .read = cmos_ioport_read,
-    .write = cmos_ioport_write,
-    .impl = {
-        .min_access_size = 1,
-        .max_access_size = 1,
-    },
-    .endianness = DEVICE_LITTLE_ENDIAN,
-};
-
-static void rtc_get_date(Object *obj, struct tm *current_tm, Error **errp)
-{
-    RTCState *s = MC146818_RTC(obj);
-
-    rtc_update_time(s);
-    rtc_get_time(s, current_tm);
-}
-
-static void rtc_realizefn(DeviceState *dev, Error **errp)
-{
-    ISADevice *isadev = ISA_DEVICE(dev);
-    RTCState *s = MC146818_RTC(dev);
-    int base = 0x70;
-
-    s->cmos_data[RTC_REG_A] = 0x26;
-    s->cmos_data[RTC_REG_B] = 0x02;
-    s->cmos_data[RTC_REG_C] = 0x00;
-    s->cmos_data[RTC_REG_D] = 0x80;
-
-    /* This is for historical reasons.  The default base year qdev property
-     * was set to 2000 for most machine types before the century byte was
-     * implemented.
-     *
-     * This if statement means that the century byte will be always 0
-     * (at least until 2079...) for base_year = 1980, but will be set
-     * correctly for base_year = 2000.
-     */
-    if (s->base_year == 2000) {
-        s->base_year = 0;
-    }
-
-    rtc_set_date_from_host(isadev);
-
-    switch (s->lost_tick_policy) {
-#ifdef TARGET_I386
-    case LOST_TICK_POLICY_SLEW:
-        s->coalesced_timer =
-            timer_new_ns(rtc_clock, rtc_coalesced_timer, s);
-        break;
-#endif
-    case LOST_TICK_POLICY_DISCARD:
-        break;
-    default:
-        error_setg(errp, "Invalid lost tick policy.");
-        return;
-    }
-
-    s->periodic_timer = timer_new_ns(rtc_clock, rtc_periodic_timer, s);
-    s->update_timer = timer_new_ns(rtc_clock, rtc_update_timer, s);
-    check_update_timer(s);
-
-    s->suspend_notifier.notify = rtc_notify_suspend;
-    qemu_register_suspend_notifier(&s->suspend_notifier);
-
-    memory_region_init_io(&s->io, OBJECT(s), &cmos_ops, s, "rtc", 2);
-    isa_register_ioport(isadev, &s->io, base);
-
-    /* register rtc 0x70 port for coalesced_pio */
-    memory_region_set_flush_coalesced(&s->io);
-    memory_region_init_io(&s->coalesced_io, OBJECT(s), &cmos_ops,
-                          s, "rtc-index", 1);
-    memory_region_add_subregion(&s->io, 0, &s->coalesced_io);
-    memory_region_add_coalescing(&s->coalesced_io, 0, 1);
-
-    qdev_set_legacy_instance_id(dev, base, 3);
-    qemu_register_reset(rtc_reset, s);
-
-    object_property_add_tm(OBJECT(s), "date", rtc_get_date, NULL);
-
-    qdev_init_gpio_out(dev, &s->irq, 1);
-}
-
-ISADevice *mc146818_rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq)
-{
-    DeviceState *dev;
-    ISADevice *isadev;
-    RTCState *s;
-
-    isadev = isa_create(bus, TYPE_MC146818_RTC);
-    dev = DEVICE(isadev);
-    s = MC146818_RTC(isadev);
-    qdev_prop_set_int32(dev, "base_year", base_year);
-    qdev_init_nofail(dev);
-    if (intercept_irq) {
-        qdev_connect_gpio_out(dev, 0, intercept_irq);
-    } else {
-        isa_connect_gpio_out(isadev, 0, RTC_ISA_IRQ);
-    }
-    QLIST_INSERT_HEAD(&rtc_devices, s, link);
-
-    object_property_add_alias(qdev_get_machine(), "rtc-time", OBJECT(s),
-                              "date", NULL);
-
-    return isadev;
-}
-
-static Property mc146818rtc_properties[] = {
-    DEFINE_PROP_INT32("base_year", RTCState, base_year, 1980),
-    DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", RTCState,
-                               lost_tick_policy, LOST_TICK_POLICY_DISCARD),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
-static void rtc_resetdev(DeviceState *d)
-{
-    RTCState *s = MC146818_RTC(d);
-
-    /* Reason: VM do suspend self will set 0xfe
-     * Reset any values other than 0xfe(Guest suspend case) */
-    if (s->cmos_data[0x0f] != 0xfe) {
-        s->cmos_data[0x0f] = 0x00;
-    }
-}
-
-static void rtc_class_initfn(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-
-    dc->realize = rtc_realizefn;
-    dc->reset = rtc_resetdev;
-    dc->vmsd = &vmstate_rtc;
-    dc->props = mc146818rtc_properties;
-    /* Reason: needs to be wired up by rtc_init() */
-    dc->user_creatable = false;
-}
-
-static const TypeInfo mc146818rtc_info = {
-    .name          = TYPE_MC146818_RTC,
-    .parent        = TYPE_ISA_DEVICE,
-    .instance_size = sizeof(RTCState),
-    .class_init    = rtc_class_initfn,
-};
-
-static void mc146818rtc_register_types(void)
-{
-    type_register_static(&mc146818rtc_info);
-}
-
-type_init(mc146818rtc_register_types)