root / hw / timer / mc146818rtc.c @ db895a1e
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/*
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* QEMU MC146818 RTC emulation
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw/hw.h" |
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#include "qemu/timer.h" |
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#include "sysemu/sysemu.h" |
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#include "hw/timer/mc146818rtc.h" |
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#include "qapi/visitor.h" |
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#ifdef TARGET_I386
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#include "hw/i386/apic.h" |
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#endif
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//#define DEBUG_CMOS
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//#define DEBUG_COALESCED
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#ifdef DEBUG_CMOS
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# define CMOS_DPRINTF(format, ...) printf(format, ## __VA_ARGS__) |
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#else
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# define CMOS_DPRINTF(format, ...) do { } while (0) |
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#endif
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#ifdef DEBUG_COALESCED
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# define DPRINTF_C(format, ...) printf(format, ## __VA_ARGS__) |
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#else
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# define DPRINTF_C(format, ...) do { } while (0) |
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#endif
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#define NSEC_PER_SEC 1000000000LL |
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#define SEC_PER_MIN 60 |
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#define MIN_PER_HOUR 60 |
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#define SEC_PER_HOUR 3600 |
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#define HOUR_PER_DAY 24 |
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#define SEC_PER_DAY 86400 |
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|
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#define RTC_REINJECT_ON_ACK_COUNT 20 |
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#define RTC_CLOCK_RATE 32768 |
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#define UIP_HOLD_LENGTH (8 * NSEC_PER_SEC / 32768) |
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#define MC146818_RTC(obj) OBJECT_CHECK(RTCState, (obj), TYPE_MC146818_RTC)
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typedef struct RTCState { |
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ISADevice parent_obj; |
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MemoryRegion io; |
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uint8_t cmos_data[128];
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uint8_t cmos_index; |
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int32_t base_year; |
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uint64_t base_rtc; |
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uint64_t last_update; |
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int64_t offset; |
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qemu_irq irq; |
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qemu_irq sqw_irq; |
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int it_shift;
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/* periodic timer */
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QEMUTimer *periodic_timer; |
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int64_t next_periodic_time; |
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/* update-ended timer */
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QEMUTimer *update_timer; |
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uint64_t next_alarm_time; |
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uint16_t irq_reinject_on_ack_count; |
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uint32_t irq_coalesced; |
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uint32_t period; |
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QEMUTimer *coalesced_timer; |
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Notifier clock_reset_notifier; |
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LostTickPolicy lost_tick_policy; |
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Notifier suspend_notifier; |
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} RTCState; |
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static void rtc_set_time(RTCState *s); |
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static void rtc_update_time(RTCState *s); |
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static void rtc_set_cmos(RTCState *s, const struct tm *tm); |
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static inline int rtc_from_bcd(RTCState *s, int a); |
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static uint64_t get_next_alarm(RTCState *s);
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static inline bool rtc_running(RTCState *s) |
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{ |
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return (!(s->cmos_data[RTC_REG_B] & REG_B_SET) &&
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(s->cmos_data[RTC_REG_A] & 0x70) <= 0x20); |
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} |
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static uint64_t get_guest_rtc_ns(RTCState *s)
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{ |
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uint64_t guest_rtc; |
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uint64_t guest_clock = qemu_get_clock_ns(rtc_clock); |
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guest_rtc = s->base_rtc * NSEC_PER_SEC |
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+ guest_clock - s->last_update + s->offset; |
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return guest_rtc;
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} |
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#ifdef TARGET_I386
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static void rtc_coalesced_timer_update(RTCState *s) |
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{ |
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if (s->irq_coalesced == 0) { |
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qemu_del_timer(s->coalesced_timer); |
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} else {
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/* divide each RTC interval to 2 - 8 smaller intervals */
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int c = MIN(s->irq_coalesced, 7) + 1; |
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int64_t next_clock = qemu_get_clock_ns(rtc_clock) + |
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muldiv64(s->period / c, get_ticks_per_sec(), RTC_CLOCK_RATE); |
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qemu_mod_timer(s->coalesced_timer, next_clock); |
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} |
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} |
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static void rtc_coalesced_timer(void *opaque) |
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{ |
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RTCState *s = opaque; |
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if (s->irq_coalesced != 0) { |
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apic_reset_irq_delivered(); |
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s->cmos_data[RTC_REG_C] |= 0xc0;
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DPRINTF_C("cmos: injecting from timer\n");
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qemu_irq_raise(s->irq); |
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if (apic_get_irq_delivered()) {
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s->irq_coalesced--; |
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DPRINTF_C("cmos: coalesced irqs decreased to %d\n",
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s->irq_coalesced); |
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} |
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} |
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rtc_coalesced_timer_update(s); |
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} |
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#endif
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/* handle periodic timer */
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static void periodic_timer_update(RTCState *s, int64_t current_time) |
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{ |
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int period_code, period;
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int64_t cur_clock, next_irq_clock; |
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period_code = s->cmos_data[RTC_REG_A] & 0x0f;
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if (period_code != 0 |
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&& ((s->cmos_data[RTC_REG_B] & REG_B_PIE) |
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|| ((s->cmos_data[RTC_REG_B] & REG_B_SQWE) && s->sqw_irq))) { |
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if (period_code <= 2) |
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period_code += 7;
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/* period in 32 Khz cycles */
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period = 1 << (period_code - 1); |
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#ifdef TARGET_I386
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if (period != s->period) {
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s->irq_coalesced = (s->irq_coalesced * s->period) / period; |
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DPRINTF_C("cmos: coalesced irqs scaled to %d\n", s->irq_coalesced);
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} |
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s->period = period; |
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#endif
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/* compute 32 khz clock */
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cur_clock = muldiv64(current_time, RTC_CLOCK_RATE, get_ticks_per_sec()); |
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next_irq_clock = (cur_clock & ~(period - 1)) + period;
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s->next_periodic_time = |
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muldiv64(next_irq_clock, get_ticks_per_sec(), RTC_CLOCK_RATE) + 1;
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qemu_mod_timer(s->periodic_timer, s->next_periodic_time); |
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} else {
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#ifdef TARGET_I386
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s->irq_coalesced = 0;
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#endif
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qemu_del_timer(s->periodic_timer); |
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} |
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} |
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static void rtc_periodic_timer(void *opaque) |
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{ |
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RTCState *s = opaque; |
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periodic_timer_update(s, s->next_periodic_time); |
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s->cmos_data[RTC_REG_C] |= REG_C_PF; |
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if (s->cmos_data[RTC_REG_B] & REG_B_PIE) {
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s->cmos_data[RTC_REG_C] |= REG_C_IRQF; |
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#ifdef TARGET_I386
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if (s->lost_tick_policy == LOST_TICK_SLEW) {
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if (s->irq_reinject_on_ack_count >= RTC_REINJECT_ON_ACK_COUNT)
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s->irq_reinject_on_ack_count = 0;
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apic_reset_irq_delivered(); |
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qemu_irq_raise(s->irq); |
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if (!apic_get_irq_delivered()) {
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s->irq_coalesced++; |
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rtc_coalesced_timer_update(s); |
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DPRINTF_C("cmos: coalesced irqs increased to %d\n",
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s->irq_coalesced); |
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} |
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} else
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#endif
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qemu_irq_raise(s->irq); |
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} |
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if (s->cmos_data[RTC_REG_B] & REG_B_SQWE) {
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/* Not square wave at all but we don't want 2048Hz interrupts!
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Must be seen as a pulse. */
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qemu_irq_raise(s->sqw_irq); |
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} |
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} |
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/* handle update-ended timer */
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static void check_update_timer(RTCState *s) |
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{ |
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uint64_t next_update_time; |
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uint64_t guest_nsec; |
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int next_alarm_sec;
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/* From the data sheet: "Holding the dividers in reset prevents
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* interrupts from operating, while setting the SET bit allows"
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* them to occur. However, it will prevent an alarm interrupt
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* from occurring, because the time of day is not updated.
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*/
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if ((s->cmos_data[RTC_REG_A] & 0x60) == 0x60) { |
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qemu_del_timer(s->update_timer); |
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return;
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} |
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if ((s->cmos_data[RTC_REG_C] & REG_C_UF) &&
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(s->cmos_data[RTC_REG_B] & REG_B_SET)) { |
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qemu_del_timer(s->update_timer); |
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return;
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} |
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if ((s->cmos_data[RTC_REG_C] & REG_C_UF) &&
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(s->cmos_data[RTC_REG_C] & REG_C_AF)) { |
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qemu_del_timer(s->update_timer); |
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return;
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} |
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guest_nsec = get_guest_rtc_ns(s) % NSEC_PER_SEC; |
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/* if UF is clear, reprogram to next second */
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next_update_time = qemu_get_clock_ns(rtc_clock) |
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+ NSEC_PER_SEC - guest_nsec; |
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/* Compute time of next alarm. One second is already accounted
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* for in next_update_time.
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*/
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next_alarm_sec = get_next_alarm(s); |
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s->next_alarm_time = next_update_time + (next_alarm_sec - 1) * NSEC_PER_SEC;
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if (s->cmos_data[RTC_REG_C] & REG_C_UF) {
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/* UF is set, but AF is clear. Program the timer to target
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* the alarm time. */
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next_update_time = s->next_alarm_time; |
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} |
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if (next_update_time != qemu_timer_expire_time_ns(s->update_timer)) {
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qemu_mod_timer(s->update_timer, next_update_time); |
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} |
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} |
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static inline uint8_t convert_hour(RTCState *s, uint8_t hour) |
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{ |
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if (!(s->cmos_data[RTC_REG_B] & REG_B_24H)) {
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hour %= 12;
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if (s->cmos_data[RTC_HOURS] & 0x80) { |
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hour += 12;
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} |
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} |
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return hour;
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} |
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static uint64_t get_next_alarm(RTCState *s)
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{ |
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int32_t alarm_sec, alarm_min, alarm_hour, cur_hour, cur_min, cur_sec; |
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int32_t hour, min, sec; |
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rtc_update_time(s); |
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alarm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS_ALARM]); |
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alarm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES_ALARM]); |
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alarm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS_ALARM]); |
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alarm_hour = alarm_hour == -1 ? -1 : convert_hour(s, alarm_hour); |
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|
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cur_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]); |
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cur_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]); |
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cur_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS]); |
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cur_hour = convert_hour(s, cur_hour); |
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if (alarm_hour == -1) { |
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alarm_hour = cur_hour; |
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if (alarm_min == -1) { |
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alarm_min = cur_min; |
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if (alarm_sec == -1) { |
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alarm_sec = cur_sec + 1;
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} else if (cur_sec > alarm_sec) { |
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alarm_min++; |
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} |
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} else if (cur_min == alarm_min) { |
298 |
if (alarm_sec == -1) { |
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alarm_sec = cur_sec + 1;
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} else {
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if (cur_sec > alarm_sec) {
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alarm_hour++; |
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} |
304 |
} |
305 |
if (alarm_sec == SEC_PER_MIN) {
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/* wrap to next hour, minutes is not in don't care mode */
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alarm_sec = 0;
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alarm_hour++; |
309 |
} |
310 |
} else if (cur_min > alarm_min) { |
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alarm_hour++; |
312 |
} |
313 |
} else if (cur_hour == alarm_hour) { |
314 |
if (alarm_min == -1) { |
315 |
alarm_min = cur_min; |
316 |
if (alarm_sec == -1) { |
317 |
alarm_sec = cur_sec + 1;
|
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} else if (cur_sec > alarm_sec) { |
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alarm_min++; |
320 |
} |
321 |
|
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if (alarm_sec == SEC_PER_MIN) {
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alarm_sec = 0;
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alarm_min++; |
325 |
} |
326 |
/* wrap to next day, hour is not in don't care mode */
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alarm_min %= MIN_PER_HOUR; |
328 |
} else if (cur_min == alarm_min) { |
329 |
if (alarm_sec == -1) { |
330 |
alarm_sec = cur_sec + 1;
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} |
332 |
/* wrap to next day, hours+minutes not in don't care mode */
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alarm_sec %= SEC_PER_MIN; |
334 |
} |
335 |
} |
336 |
|
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/* values that are still don't care fire at the next min/sec */
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338 |
if (alarm_min == -1) { |
339 |
alarm_min = 0;
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} |
341 |
if (alarm_sec == -1) { |
342 |
alarm_sec = 0;
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} |
344 |
|
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/* keep values in range */
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if (alarm_sec == SEC_PER_MIN) {
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alarm_sec = 0;
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alarm_min++; |
349 |
} |
350 |
if (alarm_min == MIN_PER_HOUR) {
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alarm_min = 0;
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alarm_hour++; |
353 |
} |
354 |
alarm_hour %= HOUR_PER_DAY; |
355 |
|
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hour = alarm_hour - cur_hour; |
357 |
min = hour * MIN_PER_HOUR + alarm_min - cur_min; |
358 |
sec = min * SEC_PER_MIN + alarm_sec - cur_sec; |
359 |
return sec <= 0 ? sec + SEC_PER_DAY : sec; |
360 |
} |
361 |
|
362 |
static void rtc_update_timer(void *opaque) |
363 |
{ |
364 |
RTCState *s = opaque; |
365 |
int32_t irqs = REG_C_UF; |
366 |
int32_t new_irqs; |
367 |
|
368 |
assert((s->cmos_data[RTC_REG_A] & 0x60) != 0x60); |
369 |
|
370 |
/* UIP might have been latched, update time and clear it. */
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rtc_update_time(s); |
372 |
s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; |
373 |
|
374 |
if (qemu_get_clock_ns(rtc_clock) >= s->next_alarm_time) {
|
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irqs |= REG_C_AF; |
376 |
if (s->cmos_data[RTC_REG_B] & REG_B_AIE) {
|
377 |
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_RTC); |
378 |
} |
379 |
} |
380 |
|
381 |
new_irqs = irqs & ~s->cmos_data[RTC_REG_C]; |
382 |
s->cmos_data[RTC_REG_C] |= irqs; |
383 |
if ((new_irqs & s->cmos_data[RTC_REG_B]) != 0) { |
384 |
s->cmos_data[RTC_REG_C] |= REG_C_IRQF; |
385 |
qemu_irq_raise(s->irq); |
386 |
} |
387 |
check_update_timer(s); |
388 |
} |
389 |
|
390 |
static void cmos_ioport_write(void *opaque, hwaddr addr, |
391 |
uint64_t data, unsigned size)
|
392 |
{ |
393 |
RTCState *s = opaque; |
394 |
|
395 |
if ((addr & 1) == 0) { |
396 |
s->cmos_index = data & 0x7f;
|
397 |
} else {
|
398 |
CMOS_DPRINTF("cmos: write index=0x%02x val=0x%02x\n",
|
399 |
s->cmos_index, data); |
400 |
switch(s->cmos_index) {
|
401 |
case RTC_SECONDS_ALARM:
|
402 |
case RTC_MINUTES_ALARM:
|
403 |
case RTC_HOURS_ALARM:
|
404 |
s->cmos_data[s->cmos_index] = data; |
405 |
check_update_timer(s); |
406 |
break;
|
407 |
case RTC_IBM_PS2_CENTURY_BYTE:
|
408 |
s->cmos_index = RTC_CENTURY; |
409 |
/* fall through */
|
410 |
case RTC_CENTURY:
|
411 |
case RTC_SECONDS:
|
412 |
case RTC_MINUTES:
|
413 |
case RTC_HOURS:
|
414 |
case RTC_DAY_OF_WEEK:
|
415 |
case RTC_DAY_OF_MONTH:
|
416 |
case RTC_MONTH:
|
417 |
case RTC_YEAR:
|
418 |
s->cmos_data[s->cmos_index] = data; |
419 |
/* if in set mode, do not update the time */
|
420 |
if (rtc_running(s)) {
|
421 |
rtc_set_time(s); |
422 |
check_update_timer(s); |
423 |
} |
424 |
break;
|
425 |
case RTC_REG_A:
|
426 |
if ((data & 0x60) == 0x60) { |
427 |
if (rtc_running(s)) {
|
428 |
rtc_update_time(s); |
429 |
} |
430 |
/* What happens to UIP when divider reset is enabled is
|
431 |
* unclear from the datasheet. Shouldn't matter much
|
432 |
* though.
|
433 |
*/
|
434 |
s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; |
435 |
} else if (((s->cmos_data[RTC_REG_A] & 0x60) == 0x60) && |
436 |
(data & 0x70) <= 0x20) { |
437 |
/* when the divider reset is removed, the first update cycle
|
438 |
* begins one-half second later*/
|
439 |
if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
|
440 |
s->offset = 500000000;
|
441 |
rtc_set_time(s); |
442 |
} |
443 |
s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; |
444 |
} |
445 |
/* UIP bit is read only */
|
446 |
s->cmos_data[RTC_REG_A] = (data & ~REG_A_UIP) | |
447 |
(s->cmos_data[RTC_REG_A] & REG_A_UIP); |
448 |
periodic_timer_update(s, qemu_get_clock_ns(rtc_clock)); |
449 |
check_update_timer(s); |
450 |
break;
|
451 |
case RTC_REG_B:
|
452 |
if (data & REG_B_SET) {
|
453 |
/* update cmos to when the rtc was stopping */
|
454 |
if (rtc_running(s)) {
|
455 |
rtc_update_time(s); |
456 |
} |
457 |
/* set mode: reset UIP mode */
|
458 |
s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; |
459 |
data &= ~REG_B_UIE; |
460 |
} else {
|
461 |
/* if disabling set mode, update the time */
|
462 |
if ((s->cmos_data[RTC_REG_B] & REG_B_SET) &&
|
463 |
(s->cmos_data[RTC_REG_A] & 0x70) <= 0x20) { |
464 |
s->offset = get_guest_rtc_ns(s) % NSEC_PER_SEC; |
465 |
rtc_set_time(s); |
466 |
} |
467 |
} |
468 |
/* if an interrupt flag is already set when the interrupt
|
469 |
* becomes enabled, raise an interrupt immediately. */
|
470 |
if (data & s->cmos_data[RTC_REG_C] & REG_C_MASK) {
|
471 |
s->cmos_data[RTC_REG_C] |= REG_C_IRQF; |
472 |
qemu_irq_raise(s->irq); |
473 |
} else {
|
474 |
s->cmos_data[RTC_REG_C] &= ~REG_C_IRQF; |
475 |
qemu_irq_lower(s->irq); |
476 |
} |
477 |
s->cmos_data[RTC_REG_B] = data; |
478 |
periodic_timer_update(s, qemu_get_clock_ns(rtc_clock)); |
479 |
check_update_timer(s); |
480 |
break;
|
481 |
case RTC_REG_C:
|
482 |
case RTC_REG_D:
|
483 |
/* cannot write to them */
|
484 |
break;
|
485 |
default:
|
486 |
s->cmos_data[s->cmos_index] = data; |
487 |
break;
|
488 |
} |
489 |
} |
490 |
} |
491 |
|
492 |
static inline int rtc_to_bcd(RTCState *s, int a) |
493 |
{ |
494 |
if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
|
495 |
return a;
|
496 |
} else {
|
497 |
return ((a / 10) << 4) | (a % 10); |
498 |
} |
499 |
} |
500 |
|
501 |
static inline int rtc_from_bcd(RTCState *s, int a) |
502 |
{ |
503 |
if ((a & 0xc0) == 0xc0) { |
504 |
return -1; |
505 |
} |
506 |
if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
|
507 |
return a;
|
508 |
} else {
|
509 |
return ((a >> 4) * 10) + (a & 0x0f); |
510 |
} |
511 |
} |
512 |
|
513 |
static void rtc_get_time(RTCState *s, struct tm *tm) |
514 |
{ |
515 |
tm->tm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]); |
516 |
tm->tm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]); |
517 |
tm->tm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
|
518 |
if (!(s->cmos_data[RTC_REG_B] & REG_B_24H)) {
|
519 |
tm->tm_hour %= 12;
|
520 |
if (s->cmos_data[RTC_HOURS] & 0x80) { |
521 |
tm->tm_hour += 12;
|
522 |
} |
523 |
} |
524 |
tm->tm_wday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]) - 1;
|
525 |
tm->tm_mday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]); |
526 |
tm->tm_mon = rtc_from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
|
527 |
tm->tm_year = |
528 |
rtc_from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year + |
529 |
rtc_from_bcd(s, s->cmos_data[RTC_CENTURY]) * 100 - 1900; |
530 |
} |
531 |
|
532 |
static void rtc_set_time(RTCState *s) |
533 |
{ |
534 |
struct tm tm;
|
535 |
|
536 |
rtc_get_time(s, &tm); |
537 |
s->base_rtc = mktimegm(&tm); |
538 |
s->last_update = qemu_get_clock_ns(rtc_clock); |
539 |
|
540 |
rtc_change_mon_event(&tm); |
541 |
} |
542 |
|
543 |
static void rtc_set_cmos(RTCState *s, const struct tm *tm) |
544 |
{ |
545 |
int year;
|
546 |
|
547 |
s->cmos_data[RTC_SECONDS] = rtc_to_bcd(s, tm->tm_sec); |
548 |
s->cmos_data[RTC_MINUTES] = rtc_to_bcd(s, tm->tm_min); |
549 |
if (s->cmos_data[RTC_REG_B] & REG_B_24H) {
|
550 |
/* 24 hour format */
|
551 |
s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, tm->tm_hour); |
552 |
} else {
|
553 |
/* 12 hour format */
|
554 |
int h = (tm->tm_hour % 12) ? tm->tm_hour % 12 : 12; |
555 |
s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, h); |
556 |
if (tm->tm_hour >= 12) |
557 |
s->cmos_data[RTC_HOURS] |= 0x80;
|
558 |
} |
559 |
s->cmos_data[RTC_DAY_OF_WEEK] = rtc_to_bcd(s, tm->tm_wday + 1);
|
560 |
s->cmos_data[RTC_DAY_OF_MONTH] = rtc_to_bcd(s, tm->tm_mday); |
561 |
s->cmos_data[RTC_MONTH] = rtc_to_bcd(s, tm->tm_mon + 1);
|
562 |
year = tm->tm_year + 1900 - s->base_year;
|
563 |
s->cmos_data[RTC_YEAR] = rtc_to_bcd(s, year % 100);
|
564 |
s->cmos_data[RTC_CENTURY] = rtc_to_bcd(s, year / 100);
|
565 |
} |
566 |
|
567 |
static void rtc_update_time(RTCState *s) |
568 |
{ |
569 |
struct tm ret;
|
570 |
time_t guest_sec; |
571 |
int64_t guest_nsec; |
572 |
|
573 |
guest_nsec = get_guest_rtc_ns(s); |
574 |
guest_sec = guest_nsec / NSEC_PER_SEC; |
575 |
gmtime_r(&guest_sec, &ret); |
576 |
|
577 |
/* Is SET flag of Register B disabled? */
|
578 |
if ((s->cmos_data[RTC_REG_B] & REG_B_SET) == 0) { |
579 |
rtc_set_cmos(s, &ret); |
580 |
} |
581 |
} |
582 |
|
583 |
static int update_in_progress(RTCState *s) |
584 |
{ |
585 |
int64_t guest_nsec; |
586 |
|
587 |
if (!rtc_running(s)) {
|
588 |
return 0; |
589 |
} |
590 |
if (qemu_timer_pending(s->update_timer)) {
|
591 |
int64_t next_update_time = qemu_timer_expire_time_ns(s->update_timer); |
592 |
/* Latch UIP until the timer expires. */
|
593 |
if (qemu_get_clock_ns(rtc_clock) >= (next_update_time - UIP_HOLD_LENGTH)) {
|
594 |
s->cmos_data[RTC_REG_A] |= REG_A_UIP; |
595 |
return 1; |
596 |
} |
597 |
} |
598 |
|
599 |
guest_nsec = get_guest_rtc_ns(s); |
600 |
/* UIP bit will be set at last 244us of every second. */
|
601 |
if ((guest_nsec % NSEC_PER_SEC) >= (NSEC_PER_SEC - UIP_HOLD_LENGTH)) {
|
602 |
return 1; |
603 |
} |
604 |
return 0; |
605 |
} |
606 |
|
607 |
static uint64_t cmos_ioport_read(void *opaque, hwaddr addr, |
608 |
unsigned size)
|
609 |
{ |
610 |
RTCState *s = opaque; |
611 |
int ret;
|
612 |
if ((addr & 1) == 0) { |
613 |
return 0xff; |
614 |
} else {
|
615 |
switch(s->cmos_index) {
|
616 |
case RTC_IBM_PS2_CENTURY_BYTE:
|
617 |
s->cmos_index = RTC_CENTURY; |
618 |
/* fall through */
|
619 |
case RTC_CENTURY:
|
620 |
case RTC_SECONDS:
|
621 |
case RTC_MINUTES:
|
622 |
case RTC_HOURS:
|
623 |
case RTC_DAY_OF_WEEK:
|
624 |
case RTC_DAY_OF_MONTH:
|
625 |
case RTC_MONTH:
|
626 |
case RTC_YEAR:
|
627 |
/* if not in set mode, calibrate cmos before
|
628 |
* reading*/
|
629 |
if (rtc_running(s)) {
|
630 |
rtc_update_time(s); |
631 |
} |
632 |
ret = s->cmos_data[s->cmos_index]; |
633 |
break;
|
634 |
case RTC_REG_A:
|
635 |
if (update_in_progress(s)) {
|
636 |
s->cmos_data[s->cmos_index] |= REG_A_UIP; |
637 |
} else {
|
638 |
s->cmos_data[s->cmos_index] &= ~REG_A_UIP; |
639 |
} |
640 |
ret = s->cmos_data[s->cmos_index]; |
641 |
break;
|
642 |
case RTC_REG_C:
|
643 |
ret = s->cmos_data[s->cmos_index]; |
644 |
qemu_irq_lower(s->irq); |
645 |
s->cmos_data[RTC_REG_C] = 0x00;
|
646 |
if (ret & (REG_C_UF | REG_C_AF)) {
|
647 |
check_update_timer(s); |
648 |
} |
649 |
#ifdef TARGET_I386
|
650 |
if(s->irq_coalesced &&
|
651 |
(s->cmos_data[RTC_REG_B] & REG_B_PIE) && |
652 |
s->irq_reinject_on_ack_count < RTC_REINJECT_ON_ACK_COUNT) { |
653 |
s->irq_reinject_on_ack_count++; |
654 |
s->cmos_data[RTC_REG_C] |= REG_C_IRQF | REG_C_PF; |
655 |
apic_reset_irq_delivered(); |
656 |
DPRINTF_C("cmos: injecting on ack\n");
|
657 |
qemu_irq_raise(s->irq); |
658 |
if (apic_get_irq_delivered()) {
|
659 |
s->irq_coalesced--; |
660 |
DPRINTF_C("cmos: coalesced irqs decreased to %d\n",
|
661 |
s->irq_coalesced); |
662 |
} |
663 |
} |
664 |
#endif
|
665 |
break;
|
666 |
default:
|
667 |
ret = s->cmos_data[s->cmos_index]; |
668 |
break;
|
669 |
} |
670 |
CMOS_DPRINTF("cmos: read index=0x%02x val=0x%02x\n",
|
671 |
s->cmos_index, ret); |
672 |
return ret;
|
673 |
} |
674 |
} |
675 |
|
676 |
void rtc_set_memory(ISADevice *dev, int addr, int val) |
677 |
{ |
678 |
RTCState *s = MC146818_RTC(dev); |
679 |
if (addr >= 0 && addr <= 127) |
680 |
s->cmos_data[addr] = val; |
681 |
} |
682 |
|
683 |
int rtc_get_memory(ISADevice *dev, int addr) |
684 |
{ |
685 |
RTCState *s = MC146818_RTC(dev); |
686 |
assert(addr >= 0 && addr <= 127); |
687 |
return s->cmos_data[addr];
|
688 |
} |
689 |
|
690 |
static void rtc_set_date_from_host(ISADevice *dev) |
691 |
{ |
692 |
RTCState *s = MC146818_RTC(dev); |
693 |
struct tm tm;
|
694 |
|
695 |
qemu_get_timedate(&tm, 0);
|
696 |
|
697 |
s->base_rtc = mktimegm(&tm); |
698 |
s->last_update = qemu_get_clock_ns(rtc_clock); |
699 |
s->offset = 0;
|
700 |
|
701 |
/* set the CMOS date */
|
702 |
rtc_set_cmos(s, &tm); |
703 |
} |
704 |
|
705 |
static int rtc_post_load(void *opaque, int version_id) |
706 |
{ |
707 |
RTCState *s = opaque; |
708 |
|
709 |
if (version_id <= 2) { |
710 |
rtc_set_time(s); |
711 |
s->offset = 0;
|
712 |
check_update_timer(s); |
713 |
} |
714 |
|
715 |
#ifdef TARGET_I386
|
716 |
if (version_id >= 2) { |
717 |
if (s->lost_tick_policy == LOST_TICK_SLEW) {
|
718 |
rtc_coalesced_timer_update(s); |
719 |
} |
720 |
} |
721 |
#endif
|
722 |
return 0; |
723 |
} |
724 |
|
725 |
static const VMStateDescription vmstate_rtc = { |
726 |
.name = "mc146818rtc",
|
727 |
.version_id = 3,
|
728 |
.minimum_version_id = 1,
|
729 |
.minimum_version_id_old = 1,
|
730 |
.post_load = rtc_post_load, |
731 |
.fields = (VMStateField []) { |
732 |
VMSTATE_BUFFER(cmos_data, RTCState), |
733 |
VMSTATE_UINT8(cmos_index, RTCState), |
734 |
VMSTATE_UNUSED(7*4), |
735 |
VMSTATE_TIMER(periodic_timer, RTCState), |
736 |
VMSTATE_INT64(next_periodic_time, RTCState), |
737 |
VMSTATE_UNUSED(3*8), |
738 |
VMSTATE_UINT32_V(irq_coalesced, RTCState, 2),
|
739 |
VMSTATE_UINT32_V(period, RTCState, 2),
|
740 |
VMSTATE_UINT64_V(base_rtc, RTCState, 3),
|
741 |
VMSTATE_UINT64_V(last_update, RTCState, 3),
|
742 |
VMSTATE_INT64_V(offset, RTCState, 3),
|
743 |
VMSTATE_TIMER_V(update_timer, RTCState, 3),
|
744 |
VMSTATE_UINT64_V(next_alarm_time, RTCState, 3),
|
745 |
VMSTATE_END_OF_LIST() |
746 |
} |
747 |
}; |
748 |
|
749 |
static void rtc_notify_clock_reset(Notifier *notifier, void *data) |
750 |
{ |
751 |
RTCState *s = container_of(notifier, RTCState, clock_reset_notifier); |
752 |
int64_t now = *(int64_t *)data; |
753 |
|
754 |
rtc_set_date_from_host(ISA_DEVICE(s)); |
755 |
periodic_timer_update(s, now); |
756 |
check_update_timer(s); |
757 |
#ifdef TARGET_I386
|
758 |
if (s->lost_tick_policy == LOST_TICK_SLEW) {
|
759 |
rtc_coalesced_timer_update(s); |
760 |
} |
761 |
#endif
|
762 |
} |
763 |
|
764 |
/* set CMOS shutdown status register (index 0xF) as S3_resume(0xFE)
|
765 |
BIOS will read it and start S3 resume at POST Entry */
|
766 |
static void rtc_notify_suspend(Notifier *notifier, void *data) |
767 |
{ |
768 |
RTCState *s = container_of(notifier, RTCState, suspend_notifier); |
769 |
rtc_set_memory(ISA_DEVICE(s), 0xF, 0xFE); |
770 |
} |
771 |
|
772 |
static void rtc_reset(void *opaque) |
773 |
{ |
774 |
RTCState *s = opaque; |
775 |
|
776 |
s->cmos_data[RTC_REG_B] &= ~(REG_B_PIE | REG_B_AIE | REG_B_SQWE); |
777 |
s->cmos_data[RTC_REG_C] &= ~(REG_C_UF | REG_C_IRQF | REG_C_PF | REG_C_AF); |
778 |
check_update_timer(s); |
779 |
|
780 |
qemu_irq_lower(s->irq); |
781 |
|
782 |
#ifdef TARGET_I386
|
783 |
if (s->lost_tick_policy == LOST_TICK_SLEW) {
|
784 |
s->irq_coalesced = 0;
|
785 |
} |
786 |
#endif
|
787 |
} |
788 |
|
789 |
static const MemoryRegionOps cmos_ops = { |
790 |
.read = cmos_ioport_read, |
791 |
.write = cmos_ioport_write, |
792 |
.impl = { |
793 |
.min_access_size = 1,
|
794 |
.max_access_size = 1,
|
795 |
}, |
796 |
.endianness = DEVICE_LITTLE_ENDIAN, |
797 |
}; |
798 |
|
799 |
static void rtc_get_date(Object *obj, Visitor *v, void *opaque, |
800 |
const char *name, Error **errp) |
801 |
{ |
802 |
RTCState *s = MC146818_RTC(obj); |
803 |
struct tm current_tm;
|
804 |
|
805 |
rtc_update_time(s); |
806 |
rtc_get_time(s, ¤t_tm); |
807 |
visit_start_struct(v, NULL, "struct tm", name, 0, errp); |
808 |
visit_type_int32(v, ¤t_tm.tm_year, "tm_year", errp);
|
809 |
visit_type_int32(v, ¤t_tm.tm_mon, "tm_mon", errp);
|
810 |
visit_type_int32(v, ¤t_tm.tm_mday, "tm_mday", errp);
|
811 |
visit_type_int32(v, ¤t_tm.tm_hour, "tm_hour", errp);
|
812 |
visit_type_int32(v, ¤t_tm.tm_min, "tm_min", errp);
|
813 |
visit_type_int32(v, ¤t_tm.tm_sec, "tm_sec", errp);
|
814 |
visit_end_struct(v, errp); |
815 |
} |
816 |
|
817 |
static void rtc_realizefn(DeviceState *dev, Error **errp) |
818 |
{ |
819 |
ISADevice *isadev = ISA_DEVICE(dev); |
820 |
RTCState *s = MC146818_RTC(dev); |
821 |
int base = 0x70; |
822 |
|
823 |
s->cmos_data[RTC_REG_A] = 0x26;
|
824 |
s->cmos_data[RTC_REG_B] = 0x02;
|
825 |
s->cmos_data[RTC_REG_C] = 0x00;
|
826 |
s->cmos_data[RTC_REG_D] = 0x80;
|
827 |
|
828 |
/* This is for historical reasons. The default base year qdev property
|
829 |
* was set to 2000 for most machine types before the century byte was
|
830 |
* implemented.
|
831 |
*
|
832 |
* This if statement means that the century byte will be always 0
|
833 |
* (at least until 2079...) for base_year = 1980, but will be set
|
834 |
* correctly for base_year = 2000.
|
835 |
*/
|
836 |
if (s->base_year == 2000) { |
837 |
s->base_year = 0;
|
838 |
} |
839 |
|
840 |
rtc_set_date_from_host(isadev); |
841 |
|
842 |
#ifdef TARGET_I386
|
843 |
switch (s->lost_tick_policy) {
|
844 |
case LOST_TICK_SLEW:
|
845 |
s->coalesced_timer = |
846 |
qemu_new_timer_ns(rtc_clock, rtc_coalesced_timer, s); |
847 |
break;
|
848 |
case LOST_TICK_DISCARD:
|
849 |
break;
|
850 |
default:
|
851 |
error_setg(errp, "Invalid lost tick policy.");
|
852 |
return;
|
853 |
} |
854 |
#endif
|
855 |
|
856 |
s->periodic_timer = qemu_new_timer_ns(rtc_clock, rtc_periodic_timer, s); |
857 |
s->update_timer = qemu_new_timer_ns(rtc_clock, rtc_update_timer, s); |
858 |
check_update_timer(s); |
859 |
|
860 |
s->clock_reset_notifier.notify = rtc_notify_clock_reset; |
861 |
qemu_register_clock_reset_notifier(rtc_clock, &s->clock_reset_notifier); |
862 |
|
863 |
s->suspend_notifier.notify = rtc_notify_suspend; |
864 |
qemu_register_suspend_notifier(&s->suspend_notifier); |
865 |
|
866 |
memory_region_init_io(&s->io, &cmos_ops, s, "rtc", 2); |
867 |
isa_register_ioport(isadev, &s->io, base); |
868 |
|
869 |
qdev_set_legacy_instance_id(dev, base, 3);
|
870 |
qemu_register_reset(rtc_reset, s); |
871 |
|
872 |
object_property_add(OBJECT(s), "date", "struct tm", |
873 |
rtc_get_date, NULL, NULL, s, NULL); |
874 |
} |
875 |
|
876 |
ISADevice *rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq)
|
877 |
{ |
878 |
DeviceState *dev; |
879 |
ISADevice *isadev; |
880 |
RTCState *s; |
881 |
|
882 |
isadev = isa_create(bus, TYPE_MC146818_RTC); |
883 |
dev = DEVICE(isadev); |
884 |
s = MC146818_RTC(isadev); |
885 |
qdev_prop_set_int32(dev, "base_year", base_year);
|
886 |
qdev_init_nofail(dev); |
887 |
if (intercept_irq) {
|
888 |
s->irq = intercept_irq; |
889 |
} else {
|
890 |
isa_init_irq(isadev, &s->irq, RTC_ISA_IRQ); |
891 |
} |
892 |
return isadev;
|
893 |
} |
894 |
|
895 |
static Property mc146818rtc_properties[] = {
|
896 |
DEFINE_PROP_INT32("base_year", RTCState, base_year, 1980), |
897 |
DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", RTCState,
|
898 |
lost_tick_policy, LOST_TICK_DISCARD), |
899 |
DEFINE_PROP_END_OF_LIST(), |
900 |
}; |
901 |
|
902 |
static void rtc_class_initfn(ObjectClass *klass, void *data) |
903 |
{ |
904 |
DeviceClass *dc = DEVICE_CLASS(klass); |
905 |
|
906 |
dc->realize = rtc_realizefn; |
907 |
dc->no_user = 1;
|
908 |
dc->vmsd = &vmstate_rtc; |
909 |
dc->props = mc146818rtc_properties; |
910 |
} |
911 |
|
912 |
static const TypeInfo mc146818rtc_info = { |
913 |
.name = TYPE_MC146818_RTC, |
914 |
.parent = TYPE_ISA_DEVICE, |
915 |
.instance_size = sizeof(RTCState),
|
916 |
.class_init = rtc_class_initfn, |
917 |
}; |
918 |
|
919 |
static void mc146818rtc_register_types(void) |
920 |
{ |
921 |
type_register_static(&mc146818rtc_info); |
922 |
} |
923 |
|
924 |
type_init(mc146818rtc_register_types) |