From: Philippe Mathieu-Daudé Date: Thu, 3 Oct 2019 23:03:53 +0000 (+0200) Subject: hw: Move MC146818 device from hw/timer/ to hw/rtc/ subdirectory X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=bcdb90640ae41128e0c2ae2ec8ebf5a832102097;p=qemu.git 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 Acked-by: David Gibson Signed-off-by: Philippe Mathieu-Daudé Message-Id: <20191003230404.19384-4-philmd@redhat.com> Signed-off-by: Laurent Vivier --- diff --git a/MAINTAINERS b/MAINTAINERS index 2e13ba4628..7eba146444 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1261,7 +1261,7 @@ F: hw/misc/debugexit.c F: hw/misc/pc-testdev.c F: hw/timer/hpet* F: hw/timer/i8254* -F: hw/timer/mc146818rtc* +F: hw/rtc/mc146818rtc* F: hw/watchdog/wdt_ib700.c F: hw/watchdog/wdt_i6300esb.c F: include/hw/display/vga.h @@ -1273,7 +1273,7 @@ F: include/hw/isa/i8259_internal.h F: include/hw/isa/superio.h F: include/hw/timer/hpet.h F: include/hw/timer/i8254* -F: include/hw/timer/mc146818rtc* +F: include/hw/rtc/mc146818rtc* Machine core M: Eduardo Habkost diff --git a/hw/alpha/dp264.c b/hw/alpha/dp264.c index 51feee8558..51b3cf7a61 100644 --- a/hw/alpha/dp264.c +++ b/hw/alpha/dp264.c @@ -14,7 +14,7 @@ #include "alpha_sys.h" #include "qemu/error-report.h" #include "sysemu/sysemu.h" -#include "hw/timer/mc146818rtc.h" +#include "hw/rtc/mc146818rtc.h" #include "hw/ide.h" #include "hw/timer/i8254.h" #include "hw/isa/superio.h" diff --git a/hw/hppa/machine.c b/hw/hppa/machine.c index 953d454f48..b30aba6d54 100644 --- a/hw/hppa/machine.c +++ b/hw/hppa/machine.c @@ -12,7 +12,7 @@ #include "qemu/error-report.h" #include "sysemu/reset.h" #include "sysemu/sysemu.h" -#include "hw/timer/mc146818rtc.h" +#include "hw/rtc/mc146818rtc.h" #include "hw/ide.h" #include "hw/timer/i8254.h" #include "hw/char/serial.h" diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 1d077a7cb7..d9435ba0b3 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -45,7 +45,7 @@ #include "hw/acpi/vmgenid.h" #include "hw/boards.h" #include "sysemu/tpm_backend.h" -#include "hw/timer/mc146818rtc_regs.h" +#include "hw/rtc/mc146818rtc_regs.h" #include "migration/vmstate.h" #include "hw/mem/memory-device.h" #include "sysemu/numa.h" diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 4b1904237e..51b72439b4 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -42,7 +42,7 @@ #include "elf.h" #include "migration/vmstate.h" #include "multiboot.h" -#include "hw/timer/mc146818rtc.h" +#include "hw/rtc/mc146818rtc.h" #include "hw/dma/i8257.h" #include "hw/timer/i8254.h" #include "hw/input/i8042.h" diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c index 8fad20f314..748fc2ee15 100644 --- a/hw/i386/pc_q35.c +++ b/hw/i386/pc_q35.c @@ -33,7 +33,7 @@ #include "hw/loader.h" #include "sysemu/arch_init.h" #include "hw/i2c/smbus_eeprom.h" -#include "hw/timer/mc146818rtc.h" +#include "hw/rtc/mc146818rtc.h" #include "hw/xen/xen.h" #include "sysemu/kvm.h" #include "kvm_i386.h" diff --git a/hw/mips/mips_fulong2e.c b/hw/mips/mips_fulong2e.c index cf537dd7e6..03a27e1767 100644 --- a/hw/mips/mips_fulong2e.c +++ b/hw/mips/mips_fulong2e.c @@ -39,7 +39,7 @@ #include "hw/ide.h" #include "elf.h" #include "hw/isa/vt82c686.h" -#include "hw/timer/mc146818rtc.h" +#include "hw/rtc/mc146818rtc.h" #include "hw/timer/i8254.h" #include "exec/address-spaces.h" #include "sysemu/qtest.h" diff --git a/hw/mips/mips_jazz.c b/hw/mips/mips_jazz.c index 8d010a0b6e..d978bb64a0 100644 --- a/hw/mips/mips_jazz.c +++ b/hw/mips/mips_jazz.c @@ -39,7 +39,7 @@ #include "hw/scsi/esp.h" #include "hw/mips/bios.h" #include "hw/loader.h" -#include "hw/timer/mc146818rtc.h" +#include "hw/rtc/mc146818rtc.h" #include "hw/timer/i8254.h" #include "hw/display/vga.h" #include "hw/audio/pcspk.h" diff --git a/hw/mips/mips_malta.c b/hw/mips/mips_malta.c index 4d9c64b36a..c1c8810e71 100644 --- a/hw/mips/mips_malta.c +++ b/hw/mips/mips_malta.c @@ -45,7 +45,7 @@ #include "hw/irq.h" #include "hw/loader.h" #include "elf.h" -#include "hw/timer/mc146818rtc.h" +#include "hw/rtc/mc146818rtc.h" #include "hw/timer/i8254.h" #include "exec/address-spaces.h" #include "hw/sysbus.h" /* SysBusDevice */ diff --git a/hw/mips/mips_r4k.c b/hw/mips/mips_r4k.c index bc0be26544..70024235ae 100644 --- a/hw/mips/mips_r4k.c +++ b/hw/mips/mips_r4k.c @@ -28,7 +28,7 @@ #include "hw/ide.h" #include "hw/loader.h" #include "elf.h" -#include "hw/timer/mc146818rtc.h" +#include "hw/rtc/mc146818rtc.h" #include "hw/input/i8042.h" #include "hw/timer/i8254.h" #include "exec/address-spaces.h" diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c index 4a51fb65a8..60632720ef 100644 --- a/hw/ppc/pnv.c +++ b/hw/ppc/pnv.c @@ -48,7 +48,7 @@ #include "hw/isa/isa.h" #include "hw/boards.h" #include "hw/char/serial.h" -#include "hw/timer/mc146818rtc.h" +#include "hw/rtc/mc146818rtc.h" #include diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c index 4f3c6bf190..3a51536e1a 100644 --- a/hw/ppc/prep.c +++ b/hw/ppc/prep.c @@ -40,7 +40,7 @@ #include "hw/ide.h" #include "hw/irq.h" #include "hw/loader.h" -#include "hw/timer/mc146818rtc.h" +#include "hw/rtc/mc146818rtc.h" #include "hw/isa/pc87312.h" #include "hw/net/ne2000-isa.h" #include "sysemu/arch_init.h" diff --git a/hw/rtc/Kconfig b/hw/rtc/Kconfig index 8a4383bca9..7ffd702268 100644 --- a/hw/rtc/Kconfig +++ b/hw/rtc/Kconfig @@ -1,2 +1,5 @@ config PL031 bool + +config MC146818RTC + bool diff --git a/hw/rtc/Makefile.objs b/hw/rtc/Makefile.objs index 3e1eb42563..3cac0d5a63 100644 --- a/hw/rtc/Makefile.objs +++ b/hw/rtc/Makefile.objs @@ -1 +1,2 @@ common-obj-$(CONFIG_PL031) += pl031.o +obj-$(CONFIG_MC146818RTC) += mc146818rtc.o diff --git a/hw/rtc/mc146818rtc.c b/hw/rtc/mc146818rtc.c new file mode 100644 index 0000000000..ced15f764f --- /dev/null +++ b/hw/rtc/mc146818rtc.c @@ -0,0 +1,1063 @@ +/* + * 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/rtc/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) diff --git a/hw/timer/Kconfig b/hw/timer/Kconfig index 27c5dce09e..af415c8ef8 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 9f64f6e11e..b0159189cf 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 1ddae4e7d7..02bf8a8ce8 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 6cb378751b..0000000000 --- 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) diff --git a/include/hw/rtc/mc146818rtc.h b/include/hw/rtc/mc146818rtc.h new file mode 100644 index 0000000000..2e9331637a --- /dev/null +++ b/include/hw/rtc/mc146818rtc.h @@ -0,0 +1,22 @@ +/* + * QEMU MC146818 RTC emulation + * + * Copyright (c) 2003-2004 Fabrice Bellard + * + * SPDX-License-Identifier: MIT + */ + +#ifndef HW_RTC_MC146818RTC_H +#define HW_RTC_MC146818RTC_H + +#include "hw/isa/isa.h" +#include "hw/rtc/mc146818rtc_regs.h" + +#define TYPE_MC146818_RTC "mc146818rtc" + +ISADevice *mc146818_rtc_init(ISABus *bus, int base_year, + qemu_irq intercept_irq); +void rtc_set_memory(ISADevice *dev, int addr, int val); +int rtc_get_memory(ISADevice *dev, int addr); + +#endif /* MC146818RTC_H */ 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 diff --git a/include/hw/timer/mc146818rtc.h b/include/hw/timer/mc146818rtc.h deleted file mode 100644 index fe6ed63f71..0000000000 --- a/include/hw/timer/mc146818rtc.h +++ /dev/null @@ -1,14 +0,0 @@ -#ifndef MC146818RTC_H -#define MC146818RTC_H - -#include "hw/isa/isa.h" -#include "hw/timer/mc146818rtc_regs.h" - -#define TYPE_MC146818_RTC "mc146818rtc" - -ISADevice *mc146818_rtc_init(ISABus *bus, int base_year, - qemu_irq intercept_irq); -void rtc_set_memory(ISADevice *dev, int addr, int val); -int rtc_get_memory(ISADevice *dev, int addr); - -#endif /* MC146818RTC_H */ diff --git a/include/hw/timer/mc146818rtc_regs.h b/include/hw/timer/mc146818rtc_regs.h deleted file mode 100644 index bfbb57e570..0000000000 --- a/include/hw/timer/mc146818rtc_regs.h +++ /dev/null @@ -1,90 +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. - */ - -#ifndef MC146818RTC_REGS_H -#define MC146818RTC_REGS_H - -#include "qemu/timer.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 diff --git a/tests/rtc-test.c b/tests/rtc-test.c index 6309b0ef6c..79a4ff1ed6 100644 --- a/tests/rtc-test.c +++ b/tests/rtc-test.c @@ -15,7 +15,7 @@ #include "libqtest-single.h" #include "qemu/timer.h" -#include "hw/timer/mc146818rtc_regs.h" +#include "hw/rtc/mc146818rtc_regs.h" #define UIP_HOLD_LENGTH (8 * NANOSECONDS_PER_SECOND / 32768)