root / hw / mc146818rtc.c @ 02fa69b6
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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.h" |
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#include "qemu-timer.h" |
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#include "sysemu.h" |
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#include "pc.h" |
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#include "apic.h" |
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#include "isa.h" |
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#include "mc146818rtc.h" |
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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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|
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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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|
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#define RTC_REINJECT_ON_ACK_COUNT 20 |
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|
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#define RTC_SECONDS 0 |
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#define RTC_SECONDS_ALARM 1 |
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#define RTC_MINUTES 2 |
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#define RTC_MINUTES_ALARM 3 |
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#define RTC_HOURS 4 |
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#define RTC_HOURS_ALARM 5 |
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#define RTC_ALARM_DONT_CARE 0xC0 |
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|
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#define RTC_DAY_OF_WEEK 6 |
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#define RTC_DAY_OF_MONTH 7 |
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#define RTC_MONTH 8 |
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#define RTC_YEAR 9 |
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|
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#define RTC_REG_A 10 |
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#define RTC_REG_B 11 |
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#define RTC_REG_C 12 |
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#define RTC_REG_D 13 |
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|
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#define REG_A_UIP 0x80 |
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|
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#define REG_B_SET 0x80 |
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#define REG_B_PIE 0x40 |
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#define REG_B_AIE 0x20 |
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#define REG_B_UIE 0x10 |
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#define REG_B_SQWE 0x08 |
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#define REG_B_DM 0x04 |
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#define REG_B_24H 0x02 |
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|
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#define REG_C_UF 0x10 |
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#define REG_C_IRQF 0x80 |
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#define REG_C_PF 0x40 |
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#define REG_C_AF 0x20 |
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typedef struct RTCState { |
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ISADevice dev; |
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uint8_t cmos_data[128];
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uint8_t cmos_index; |
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struct tm current_tm;
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int32_t base_year; |
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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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/* second update */
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int64_t next_second_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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QEMUTimer *second_timer; |
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QEMUTimer *second_timer2; |
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Notifier clock_reset_notifier; |
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} RTCState; |
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|
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static void rtc_set_time(RTCState *s); |
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static void rtc_copy_date(RTCState *s); |
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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(), 32768);
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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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static void rtc_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, 32768, 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(), 32768) + 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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rtc_timer_update(s, s->next_periodic_time); |
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if (s->cmos_data[RTC_REG_B] & REG_B_PIE) {
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s->cmos_data[RTC_REG_C] |= 0xc0;
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#ifdef TARGET_I386
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if(rtc_td_hack) {
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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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static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data) |
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{ |
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RTCState *s = opaque; |
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if ((addr & 1) == 0) { |
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s->cmos_index = data & 0x7f;
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} else {
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CMOS_DPRINTF("cmos: write index=0x%02x val=0x%02x\n",
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s->cmos_index, data); |
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switch(s->cmos_index) {
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case RTC_SECONDS_ALARM:
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case RTC_MINUTES_ALARM:
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case RTC_HOURS_ALARM:
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s->cmos_data[s->cmos_index] = data; |
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break;
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case RTC_SECONDS:
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case RTC_MINUTES:
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case RTC_HOURS:
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case RTC_DAY_OF_WEEK:
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case RTC_DAY_OF_MONTH:
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case RTC_MONTH:
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case RTC_YEAR:
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s->cmos_data[s->cmos_index] = data; |
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/* if in set mode, do not update the time */
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if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
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rtc_set_time(s); |
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} |
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break;
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case RTC_REG_A:
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/* UIP bit is read only */
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s->cmos_data[RTC_REG_A] = (data & ~REG_A_UIP) | |
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(s->cmos_data[RTC_REG_A] & REG_A_UIP); |
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rtc_timer_update(s, qemu_get_clock_ns(rtc_clock)); |
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break;
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case RTC_REG_B:
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if (data & REG_B_SET) {
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/* set mode: reset UIP mode */
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s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; |
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data &= ~REG_B_UIE; |
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} else {
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/* if disabling set mode, update the time */
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if (s->cmos_data[RTC_REG_B] & REG_B_SET) {
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rtc_set_time(s); |
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} |
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} |
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if (((s->cmos_data[RTC_REG_B] ^ data) & (REG_B_DM | REG_B_24H)) &&
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!(data & REG_B_SET)) { |
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/* If the time format has changed and not in set mode,
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update the registers immediately. */
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s->cmos_data[RTC_REG_B] = data; |
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rtc_copy_date(s); |
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} else {
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s->cmos_data[RTC_REG_B] = data; |
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} |
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rtc_timer_update(s, qemu_get_clock_ns(rtc_clock)); |
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break;
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case RTC_REG_C:
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case RTC_REG_D:
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/* cannot write to them */
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break;
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default:
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s->cmos_data[s->cmos_index] = data; |
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break;
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} |
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} |
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} |
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|
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static inline int rtc_to_bcd(RTCState *s, int a) |
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{ |
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if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
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return a;
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} else {
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return ((a / 10) << 4) | (a % 10); |
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} |
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} |
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|
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static inline int rtc_from_bcd(RTCState *s, int a) |
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{ |
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if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
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return a;
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} else {
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return ((a >> 4) * 10) + (a & 0x0f); |
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} |
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} |
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|
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static void rtc_set_time(RTCState *s) |
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{ |
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struct tm *tm = &s->current_tm;
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|
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tm->tm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]); |
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tm->tm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]); |
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tm->tm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
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if (!(s->cmos_data[RTC_REG_B] & REG_B_24H) &&
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(s->cmos_data[RTC_HOURS] & 0x80)) {
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tm->tm_hour += 12;
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} |
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tm->tm_wday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]) - 1;
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tm->tm_mday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]); |
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tm->tm_mon = rtc_from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
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tm->tm_year = rtc_from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year - 1900;
|
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|
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rtc_change_mon_event(tm); |
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} |
309 |
|
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static void rtc_copy_date(RTCState *s) |
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{ |
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const struct tm *tm = &s->current_tm; |
313 |
int year;
|
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|
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s->cmos_data[RTC_SECONDS] = rtc_to_bcd(s, tm->tm_sec); |
316 |
s->cmos_data[RTC_MINUTES] = rtc_to_bcd(s, tm->tm_min); |
317 |
if (s->cmos_data[RTC_REG_B] & REG_B_24H) {
|
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/* 24 hour format */
|
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s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, tm->tm_hour); |
320 |
} else {
|
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/* 12 hour format */
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s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, tm->tm_hour % 12);
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if (tm->tm_hour >= 12) |
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s->cmos_data[RTC_HOURS] |= 0x80;
|
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} |
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s->cmos_data[RTC_DAY_OF_WEEK] = rtc_to_bcd(s, tm->tm_wday + 1);
|
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s->cmos_data[RTC_DAY_OF_MONTH] = rtc_to_bcd(s, tm->tm_mday); |
328 |
s->cmos_data[RTC_MONTH] = rtc_to_bcd(s, tm->tm_mon + 1);
|
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year = (tm->tm_year - s->base_year) % 100;
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if (year < 0) |
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year += 100;
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s->cmos_data[RTC_YEAR] = rtc_to_bcd(s, year); |
333 |
} |
334 |
|
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/* month is between 0 and 11. */
|
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static int get_days_in_month(int month, int year) |
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{ |
338 |
static const int days_tab[12] = { |
339 |
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 |
340 |
}; |
341 |
int d;
|
342 |
if ((unsigned )month >= 12) |
343 |
return 31; |
344 |
d = days_tab[month]; |
345 |
if (month == 1) { |
346 |
if ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0)) |
347 |
d++; |
348 |
} |
349 |
return d;
|
350 |
} |
351 |
|
352 |
/* update 'tm' to the next second */
|
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static void rtc_next_second(struct tm *tm) |
354 |
{ |
355 |
int days_in_month;
|
356 |
|
357 |
tm->tm_sec++; |
358 |
if ((unsigned)tm->tm_sec >= 60) { |
359 |
tm->tm_sec = 0;
|
360 |
tm->tm_min++; |
361 |
if ((unsigned)tm->tm_min >= 60) { |
362 |
tm->tm_min = 0;
|
363 |
tm->tm_hour++; |
364 |
if ((unsigned)tm->tm_hour >= 24) { |
365 |
tm->tm_hour = 0;
|
366 |
/* next day */
|
367 |
tm->tm_wday++; |
368 |
if ((unsigned)tm->tm_wday >= 7) |
369 |
tm->tm_wday = 0;
|
370 |
days_in_month = get_days_in_month(tm->tm_mon, |
371 |
tm->tm_year + 1900);
|
372 |
tm->tm_mday++; |
373 |
if (tm->tm_mday < 1) { |
374 |
tm->tm_mday = 1;
|
375 |
} else if (tm->tm_mday > days_in_month) { |
376 |
tm->tm_mday = 1;
|
377 |
tm->tm_mon++; |
378 |
if (tm->tm_mon >= 12) { |
379 |
tm->tm_mon = 0;
|
380 |
tm->tm_year++; |
381 |
} |
382 |
} |
383 |
} |
384 |
} |
385 |
} |
386 |
} |
387 |
|
388 |
|
389 |
static void rtc_update_second(void *opaque) |
390 |
{ |
391 |
RTCState *s = opaque; |
392 |
int64_t delay; |
393 |
|
394 |
/* if the oscillator is not in normal operation, we do not update */
|
395 |
if ((s->cmos_data[RTC_REG_A] & 0x70) != 0x20) { |
396 |
s->next_second_time += get_ticks_per_sec(); |
397 |
qemu_mod_timer(s->second_timer, s->next_second_time); |
398 |
} else {
|
399 |
rtc_next_second(&s->current_tm); |
400 |
|
401 |
if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
|
402 |
/* update in progress bit */
|
403 |
s->cmos_data[RTC_REG_A] |= REG_A_UIP; |
404 |
} |
405 |
/* should be 244 us = 8 / 32768 seconds, but currently the
|
406 |
timers do not have the necessary resolution. */
|
407 |
delay = (get_ticks_per_sec() * 1) / 100; |
408 |
if (delay < 1) |
409 |
delay = 1;
|
410 |
qemu_mod_timer(s->second_timer2, |
411 |
s->next_second_time + delay); |
412 |
} |
413 |
} |
414 |
|
415 |
static void rtc_update_second2(void *opaque) |
416 |
{ |
417 |
RTCState *s = opaque; |
418 |
|
419 |
if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) {
|
420 |
rtc_copy_date(s); |
421 |
} |
422 |
|
423 |
/* check alarm */
|
424 |
if (s->cmos_data[RTC_REG_B] & REG_B_AIE) {
|
425 |
if (((s->cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0 || |
426 |
rtc_from_bcd(s, s->cmos_data[RTC_SECONDS_ALARM]) == s->current_tm.tm_sec) && |
427 |
((s->cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0 || |
428 |
rtc_from_bcd(s, s->cmos_data[RTC_MINUTES_ALARM]) == s->current_tm.tm_min) && |
429 |
((s->cmos_data[RTC_HOURS_ALARM] & 0xc0) == 0xc0 || |
430 |
rtc_from_bcd(s, s->cmos_data[RTC_HOURS_ALARM]) == s->current_tm.tm_hour)) { |
431 |
|
432 |
s->cmos_data[RTC_REG_C] |= 0xa0;
|
433 |
qemu_irq_raise(s->irq); |
434 |
} |
435 |
} |
436 |
|
437 |
/* update ended interrupt */
|
438 |
s->cmos_data[RTC_REG_C] |= REG_C_UF; |
439 |
if (s->cmos_data[RTC_REG_B] & REG_B_UIE) {
|
440 |
s->cmos_data[RTC_REG_C] |= REG_C_IRQF; |
441 |
qemu_irq_raise(s->irq); |
442 |
} |
443 |
|
444 |
/* clear update in progress bit */
|
445 |
s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; |
446 |
|
447 |
s->next_second_time += get_ticks_per_sec(); |
448 |
qemu_mod_timer(s->second_timer, s->next_second_time); |
449 |
} |
450 |
|
451 |
static uint32_t cmos_ioport_read(void *opaque, uint32_t addr) |
452 |
{ |
453 |
RTCState *s = opaque; |
454 |
int ret;
|
455 |
if ((addr & 1) == 0) { |
456 |
return 0xff; |
457 |
} else {
|
458 |
switch(s->cmos_index) {
|
459 |
case RTC_SECONDS:
|
460 |
case RTC_MINUTES:
|
461 |
case RTC_HOURS:
|
462 |
case RTC_DAY_OF_WEEK:
|
463 |
case RTC_DAY_OF_MONTH:
|
464 |
case RTC_MONTH:
|
465 |
case RTC_YEAR:
|
466 |
ret = s->cmos_data[s->cmos_index]; |
467 |
break;
|
468 |
case RTC_REG_A:
|
469 |
ret = s->cmos_data[s->cmos_index]; |
470 |
break;
|
471 |
case RTC_REG_C:
|
472 |
ret = s->cmos_data[s->cmos_index]; |
473 |
qemu_irq_lower(s->irq); |
474 |
#ifdef TARGET_I386
|
475 |
if(s->irq_coalesced &&
|
476 |
s->irq_reinject_on_ack_count < RTC_REINJECT_ON_ACK_COUNT) { |
477 |
s->irq_reinject_on_ack_count++; |
478 |
apic_reset_irq_delivered(); |
479 |
DPRINTF_C("cmos: injecting on ack\n");
|
480 |
qemu_irq_raise(s->irq); |
481 |
if (apic_get_irq_delivered()) {
|
482 |
s->irq_coalesced--; |
483 |
DPRINTF_C("cmos: coalesced irqs decreased to %d\n",
|
484 |
s->irq_coalesced); |
485 |
} |
486 |
break;
|
487 |
} |
488 |
#endif
|
489 |
|
490 |
s->cmos_data[RTC_REG_C] = 0x00;
|
491 |
break;
|
492 |
default:
|
493 |
ret = s->cmos_data[s->cmos_index]; |
494 |
break;
|
495 |
} |
496 |
CMOS_DPRINTF("cmos: read index=0x%02x val=0x%02x\n",
|
497 |
s->cmos_index, ret); |
498 |
return ret;
|
499 |
} |
500 |
} |
501 |
|
502 |
void rtc_set_memory(ISADevice *dev, int addr, int val) |
503 |
{ |
504 |
RTCState *s = DO_UPCAST(RTCState, dev, dev); |
505 |
if (addr >= 0 && addr <= 127) |
506 |
s->cmos_data[addr] = val; |
507 |
} |
508 |
|
509 |
void rtc_set_date(ISADevice *dev, const struct tm *tm) |
510 |
{ |
511 |
RTCState *s = DO_UPCAST(RTCState, dev, dev); |
512 |
s->current_tm = *tm; |
513 |
rtc_copy_date(s); |
514 |
} |
515 |
|
516 |
/* PC cmos mappings */
|
517 |
#define REG_IBM_CENTURY_BYTE 0x32 |
518 |
#define REG_IBM_PS2_CENTURY_BYTE 0x37 |
519 |
|
520 |
static void rtc_set_date_from_host(ISADevice *dev) |
521 |
{ |
522 |
RTCState *s = DO_UPCAST(RTCState, dev, dev); |
523 |
struct tm tm;
|
524 |
int val;
|
525 |
|
526 |
/* set the CMOS date */
|
527 |
qemu_get_timedate(&tm, 0);
|
528 |
rtc_set_date(dev, &tm); |
529 |
|
530 |
val = rtc_to_bcd(s, (tm.tm_year / 100) + 19); |
531 |
rtc_set_memory(dev, REG_IBM_CENTURY_BYTE, val); |
532 |
rtc_set_memory(dev, REG_IBM_PS2_CENTURY_BYTE, val); |
533 |
} |
534 |
|
535 |
static int rtc_post_load(void *opaque, int version_id) |
536 |
{ |
537 |
#ifdef TARGET_I386
|
538 |
RTCState *s = opaque; |
539 |
|
540 |
if (version_id >= 2) { |
541 |
if (rtc_td_hack) {
|
542 |
rtc_coalesced_timer_update(s); |
543 |
} |
544 |
} |
545 |
#endif
|
546 |
return 0; |
547 |
} |
548 |
|
549 |
static const VMStateDescription vmstate_rtc = { |
550 |
.name = "mc146818rtc",
|
551 |
.version_id = 2,
|
552 |
.minimum_version_id = 1,
|
553 |
.minimum_version_id_old = 1,
|
554 |
.post_load = rtc_post_load, |
555 |
.fields = (VMStateField []) { |
556 |
VMSTATE_BUFFER(cmos_data, RTCState), |
557 |
VMSTATE_UINT8(cmos_index, RTCState), |
558 |
VMSTATE_INT32(current_tm.tm_sec, RTCState), |
559 |
VMSTATE_INT32(current_tm.tm_min, RTCState), |
560 |
VMSTATE_INT32(current_tm.tm_hour, RTCState), |
561 |
VMSTATE_INT32(current_tm.tm_wday, RTCState), |
562 |
VMSTATE_INT32(current_tm.tm_mday, RTCState), |
563 |
VMSTATE_INT32(current_tm.tm_mon, RTCState), |
564 |
VMSTATE_INT32(current_tm.tm_year, RTCState), |
565 |
VMSTATE_TIMER(periodic_timer, RTCState), |
566 |
VMSTATE_INT64(next_periodic_time, RTCState), |
567 |
VMSTATE_INT64(next_second_time, RTCState), |
568 |
VMSTATE_TIMER(second_timer, RTCState), |
569 |
VMSTATE_TIMER(second_timer2, RTCState), |
570 |
VMSTATE_UINT32_V(irq_coalesced, RTCState, 2),
|
571 |
VMSTATE_UINT32_V(period, RTCState, 2),
|
572 |
VMSTATE_END_OF_LIST() |
573 |
} |
574 |
}; |
575 |
|
576 |
static void rtc_notify_clock_reset(Notifier *notifier, void *data) |
577 |
{ |
578 |
RTCState *s = container_of(notifier, RTCState, clock_reset_notifier); |
579 |
int64_t now = *(int64_t *)data; |
580 |
|
581 |
rtc_set_date_from_host(&s->dev); |
582 |
s->next_second_time = now + (get_ticks_per_sec() * 99) / 100; |
583 |
qemu_mod_timer(s->second_timer2, s->next_second_time); |
584 |
rtc_timer_update(s, now); |
585 |
#ifdef TARGET_I386
|
586 |
if (rtc_td_hack) {
|
587 |
rtc_coalesced_timer_update(s); |
588 |
} |
589 |
#endif
|
590 |
} |
591 |
|
592 |
static void rtc_reset(void *opaque) |
593 |
{ |
594 |
RTCState *s = opaque; |
595 |
|
596 |
s->cmos_data[RTC_REG_B] &= ~(REG_B_PIE | REG_B_AIE | REG_B_SQWE); |
597 |
s->cmos_data[RTC_REG_C] &= ~(REG_C_UF | REG_C_IRQF | REG_C_PF | REG_C_AF); |
598 |
|
599 |
qemu_irq_lower(s->irq); |
600 |
|
601 |
#ifdef TARGET_I386
|
602 |
if (rtc_td_hack)
|
603 |
s->irq_coalesced = 0;
|
604 |
#endif
|
605 |
} |
606 |
|
607 |
static int rtc_initfn(ISADevice *dev) |
608 |
{ |
609 |
RTCState *s = DO_UPCAST(RTCState, dev, dev); |
610 |
int base = 0x70; |
611 |
|
612 |
s->cmos_data[RTC_REG_A] = 0x26;
|
613 |
s->cmos_data[RTC_REG_B] = 0x02;
|
614 |
s->cmos_data[RTC_REG_C] = 0x00;
|
615 |
s->cmos_data[RTC_REG_D] = 0x80;
|
616 |
|
617 |
rtc_set_date_from_host(dev); |
618 |
|
619 |
s->periodic_timer = qemu_new_timer_ns(rtc_clock, rtc_periodic_timer, s); |
620 |
#ifdef TARGET_I386
|
621 |
if (rtc_td_hack)
|
622 |
s->coalesced_timer = |
623 |
qemu_new_timer_ns(rtc_clock, rtc_coalesced_timer, s); |
624 |
#endif
|
625 |
s->second_timer = qemu_new_timer_ns(rtc_clock, rtc_update_second, s); |
626 |
s->second_timer2 = qemu_new_timer_ns(rtc_clock, rtc_update_second2, s); |
627 |
|
628 |
s->clock_reset_notifier.notify = rtc_notify_clock_reset; |
629 |
qemu_register_clock_reset_notifier(rtc_clock, &s->clock_reset_notifier); |
630 |
|
631 |
s->next_second_time = |
632 |
qemu_get_clock_ns(rtc_clock) + (get_ticks_per_sec() * 99) / 100; |
633 |
qemu_mod_timer(s->second_timer2, s->next_second_time); |
634 |
|
635 |
register_ioport_write(base, 2, 1, cmos_ioport_write, s); |
636 |
register_ioport_read(base, 2, 1, cmos_ioport_read, s); |
637 |
isa_init_ioport_range(dev, base, 2);
|
638 |
|
639 |
qdev_set_legacy_instance_id(&dev->qdev, base, 2);
|
640 |
qemu_register_reset(rtc_reset, s); |
641 |
return 0; |
642 |
} |
643 |
|
644 |
ISADevice *rtc_init(int base_year, qemu_irq intercept_irq)
|
645 |
{ |
646 |
ISADevice *dev; |
647 |
RTCState *s; |
648 |
|
649 |
dev = isa_create("mc146818rtc");
|
650 |
s = DO_UPCAST(RTCState, dev, dev); |
651 |
qdev_prop_set_int32(&dev->qdev, "base_year", base_year);
|
652 |
qdev_init_nofail(&dev->qdev); |
653 |
if (intercept_irq) {
|
654 |
s->irq = intercept_irq; |
655 |
} else {
|
656 |
isa_init_irq(dev, &s->irq, RTC_ISA_IRQ); |
657 |
} |
658 |
return dev;
|
659 |
} |
660 |
|
661 |
static ISADeviceInfo mc146818rtc_info = {
|
662 |
.qdev.name = "mc146818rtc",
|
663 |
.qdev.size = sizeof(RTCState),
|
664 |
.qdev.no_user = 1,
|
665 |
.qdev.vmsd = &vmstate_rtc, |
666 |
.init = rtc_initfn, |
667 |
.qdev.props = (Property[]) { |
668 |
DEFINE_PROP_INT32("base_year", RTCState, base_year, 1980), |
669 |
DEFINE_PROP_END_OF_LIST(), |
670 |
} |
671 |
}; |
672 |
|
673 |
static void mc146818rtc_register(void) |
674 |
{ |
675 |
isa_qdev_register(&mc146818rtc_info); |
676 |
} |
677 |
device_init(mc146818rtc_register) |