| /* |
| * 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 "hw.h" |
| #include "qemu-timer.h" |
| #include "sysemu.h" |
| #include "pc.h" |
| #include "apic.h" |
| #include "isa.h" |
| #include "mc146818rtc.h" |
| |
| //#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 RTC_REINJECT_ON_ACK_COUNT 20 |
| |
| #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 |
| |
| #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 |
| |
| typedef struct RTCState { |
| ISADevice dev; |
| MemoryRegion io; |
| uint8_t cmos_data[128]; |
| uint8_t cmos_index; |
| struct tm current_tm; |
| int32_t base_year; |
| qemu_irq irq; |
| qemu_irq sqw_irq; |
| int it_shift; |
| /* periodic timer */ |
| QEMUTimer *periodic_timer; |
| int64_t next_periodic_time; |
| /* second update */ |
| int64_t next_second_time; |
| uint16_t irq_reinject_on_ack_count; |
| uint32_t irq_coalesced; |
| uint32_t period; |
| QEMUTimer *coalesced_timer; |
| QEMUTimer *second_timer; |
| QEMUTimer *second_timer2; |
| Notifier clock_reset_notifier; |
| LostTickPolicy lost_tick_policy; |
| } RTCState; |
| |
| static void rtc_set_time(RTCState *s); |
| static void rtc_copy_date(RTCState *s); |
| |
| #ifdef TARGET_I386 |
| static void rtc_coalesced_timer_update(RTCState *s) |
| { |
| if (s->irq_coalesced == 0) { |
| qemu_del_timer(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_get_clock_ns(rtc_clock) + |
| muldiv64(s->period / c, get_ticks_per_sec(), 32768); |
| qemu_mod_timer(s->coalesced_timer, next_clock); |
| } |
| } |
| |
| static void rtc_coalesced_timer(void *opaque) |
| { |
| RTCState *s = opaque; |
| |
| if (s->irq_coalesced != 0) { |
| apic_reset_irq_delivered(); |
| s->cmos_data[RTC_REG_C] |= 0xc0; |
| DPRINTF_C("cmos: injecting from timer\n"); |
| qemu_irq_raise(s->irq); |
| if (apic_get_irq_delivered()) { |
| s->irq_coalesced--; |
| DPRINTF_C("cmos: coalesced irqs decreased to %d\n", |
| s->irq_coalesced); |
| } |
| } |
| |
| rtc_coalesced_timer_update(s); |
| } |
| #endif |
| |
| static void rtc_timer_update(RTCState *s, int64_t current_time) |
| { |
| int period_code, period; |
| int64_t cur_clock, next_irq_clock; |
| |
| period_code = s->cmos_data[RTC_REG_A] & 0x0f; |
| if (period_code != 0 |
| && ((s->cmos_data[RTC_REG_B] & REG_B_PIE) |
| || ((s->cmos_data[RTC_REG_B] & REG_B_SQWE) && s->sqw_irq))) { |
| if (period_code <= 2) |
| period_code += 7; |
| /* period in 32 Khz cycles */ |
| period = 1 << (period_code - 1); |
| #ifdef TARGET_I386 |
| if (period != s->period) { |
| s->irq_coalesced = (s->irq_coalesced * s->period) / period; |
| DPRINTF_C("cmos: coalesced irqs scaled to %d\n", s->irq_coalesced); |
| } |
| s->period = period; |
| #endif |
| /* compute 32 khz clock */ |
| cur_clock = muldiv64(current_time, 32768, get_ticks_per_sec()); |
| next_irq_clock = (cur_clock & ~(period - 1)) + period; |
| s->next_periodic_time = |
| muldiv64(next_irq_clock, get_ticks_per_sec(), 32768) + 1; |
| qemu_mod_timer(s->periodic_timer, s->next_periodic_time); |
| } else { |
| #ifdef TARGET_I386 |
| s->irq_coalesced = 0; |
| #endif |
| qemu_del_timer(s->periodic_timer); |
| } |
| } |
| |
| static void rtc_periodic_timer(void *opaque) |
| { |
| RTCState *s = opaque; |
| |
| rtc_timer_update(s, s->next_periodic_time); |
| 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; |
| #ifdef TARGET_I386 |
| if (s->lost_tick_policy == LOST_TICK_SLEW) { |
| if (s->irq_reinject_on_ack_count >= RTC_REINJECT_ON_ACK_COUNT) |
| s->irq_reinject_on_ack_count = 0; |
| apic_reset_irq_delivered(); |
| qemu_irq_raise(s->irq); |
| if (!apic_get_irq_delivered()) { |
| s->irq_coalesced++; |
| rtc_coalesced_timer_update(s); |
| DPRINTF_C("cmos: coalesced irqs increased to %d\n", |
| s->irq_coalesced); |
| } |
| } else |
| #endif |
| qemu_irq_raise(s->irq); |
| } |
| if (s->cmos_data[RTC_REG_B] & REG_B_SQWE) { |
| /* Not square wave at all but we don't want 2048Hz interrupts! |
| Must be seen as a pulse. */ |
| qemu_irq_raise(s->sqw_irq); |
| } |
| } |
| |
| static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data) |
| { |
| RTCState *s = opaque; |
| |
| if ((addr & 1) == 0) { |
| s->cmos_index = data & 0x7f; |
| } else { |
| CMOS_DPRINTF("cmos: write index=0x%02x val=0x%02x\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; |
| break; |
| 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 (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) { |
| rtc_set_time(s); |
| } |
| break; |
| case RTC_REG_A: |
| /* UIP bit is read only */ |
| s->cmos_data[RTC_REG_A] = (data & ~REG_A_UIP) | |
| (s->cmos_data[RTC_REG_A] & REG_A_UIP); |
| rtc_timer_update(s, qemu_get_clock_ns(rtc_clock)); |
| break; |
| case RTC_REG_B: |
| if (data & REG_B_SET) { |
| /* 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) { |
| rtc_set_time(s); |
| } |
| } |
| if (((s->cmos_data[RTC_REG_B] ^ data) & (REG_B_DM | REG_B_24H)) && |
| !(data & REG_B_SET)) { |
| /* If the time format has changed and not in set mode, |
| update the registers immediately. */ |
| s->cmos_data[RTC_REG_B] = data; |
| rtc_copy_date(s); |
| } else { |
| s->cmos_data[RTC_REG_B] = data; |
| } |
| rtc_timer_update(s, qemu_get_clock_ns(rtc_clock)); |
| 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 (s->cmos_data[RTC_REG_B] & REG_B_DM) { |
| return a; |
| } else { |
| return ((a >> 4) * 10) + (a & 0x0f); |
| } |
| } |
| |
| static void rtc_set_time(RTCState *s) |
| { |
| struct tm *tm = &s->current_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 - 1900; |
| |
| rtc_change_mon_event(tm); |
| } |
| |
| static void rtc_copy_date(RTCState *s) |
| { |
| const struct tm *tm = &s->current_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 - s->base_year) % 100; |
| if (year < 0) |
| year += 100; |
| s->cmos_data[RTC_YEAR] = rtc_to_bcd(s, year); |
| } |
| |
| /* month is between 0 and 11. */ |
| static int get_days_in_month(int month, int year) |
| { |
| static const int days_tab[12] = { |
| 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 |
| }; |
| int d; |
| if ((unsigned )month >= 12) |
| return 31; |
| d = days_tab[month]; |
| if (month == 1) { |
| if ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0)) |
| d++; |
| } |
| return d; |
| } |
| |
| /* update 'tm' to the next second */ |
| static void rtc_next_second(struct tm *tm) |
| { |
| int days_in_month; |
| |
| tm->tm_sec++; |
| if ((unsigned)tm->tm_sec >= 60) { |
| tm->tm_sec = 0; |
| tm->tm_min++; |
| if ((unsigned)tm->tm_min >= 60) { |
| tm->tm_min = 0; |
| tm->tm_hour++; |
| if ((unsigned)tm->tm_hour >= 24) { |
| tm->tm_hour = 0; |
| /* next day */ |
| tm->tm_wday++; |
| if ((unsigned)tm->tm_wday >= 7) |
| tm->tm_wday = 0; |
| days_in_month = get_days_in_month(tm->tm_mon, |
| tm->tm_year + 1900); |
| tm->tm_mday++; |
| if (tm->tm_mday < 1) { |
| tm->tm_mday = 1; |
| } else if (tm->tm_mday > days_in_month) { |
| tm->tm_mday = 1; |
| tm->tm_mon++; |
| if (tm->tm_mon >= 12) { |
| tm->tm_mon = 0; |
| tm->tm_year++; |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| |
| static void rtc_update_second(void *opaque) |
| { |
| RTCState *s = opaque; |
| int64_t delay; |
| |
| /* if the oscillator is not in normal operation, we do not update */ |
| if ((s->cmos_data[RTC_REG_A] & 0x70) != 0x20) { |
| s->next_second_time += get_ticks_per_sec(); |
| qemu_mod_timer(s->second_timer, s->next_second_time); |
| } else { |
| rtc_next_second(&s->current_tm); |
| |
| if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) { |
| /* update in progress bit */ |
| s->cmos_data[RTC_REG_A] |= REG_A_UIP; |
| } |
| /* should be 244 us = 8 / 32768 seconds, but currently the |
| timers do not have the necessary resolution. */ |
| delay = (get_ticks_per_sec() * 1) / 100; |
| if (delay < 1) |
| delay = 1; |
| qemu_mod_timer(s->second_timer2, |
| s->next_second_time + delay); |
| } |
| } |
| |
| static void rtc_update_second2(void *opaque) |
| { |
| RTCState *s = opaque; |
| |
| if (!(s->cmos_data[RTC_REG_B] & REG_B_SET)) { |
| rtc_copy_date(s); |
| } |
| |
| /* check alarm */ |
| if (((s->cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0 || |
| rtc_from_bcd(s, s->cmos_data[RTC_SECONDS_ALARM]) == s->current_tm.tm_sec) && |
| ((s->cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0 || |
| rtc_from_bcd(s, s->cmos_data[RTC_MINUTES_ALARM]) == s->current_tm.tm_min) && |
| ((s->cmos_data[RTC_HOURS_ALARM] & 0xc0) == 0xc0 || |
| rtc_from_bcd(s, s->cmos_data[RTC_HOURS_ALARM]) == s->current_tm.tm_hour)) { |
| |
| s->cmos_data[RTC_REG_C] |= REG_C_AF; |
| if (s->cmos_data[RTC_REG_B] & REG_B_AIE) { |
| qemu_irq_raise(s->irq); |
| s->cmos_data[RTC_REG_C] |= REG_C_IRQF; |
| } |
| } |
| |
| /* update ended interrupt */ |
| s->cmos_data[RTC_REG_C] |= REG_C_UF; |
| if (s->cmos_data[RTC_REG_B] & REG_B_UIE) { |
| s->cmos_data[RTC_REG_C] |= REG_C_IRQF; |
| qemu_irq_raise(s->irq); |
| } |
| |
| /* clear update in progress bit */ |
| s->cmos_data[RTC_REG_A] &= ~REG_A_UIP; |
| |
| s->next_second_time += get_ticks_per_sec(); |
| qemu_mod_timer(s->second_timer, s->next_second_time); |
| } |
| |
| static uint32_t cmos_ioport_read(void *opaque, uint32_t addr) |
| { |
| RTCState *s = opaque; |
| int ret; |
| if ((addr & 1) == 0) { |
| return 0xff; |
| } else { |
| switch(s->cmos_index) { |
| 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: |
| ret = s->cmos_data[s->cmos_index]; |
| break; |
| case RTC_REG_A: |
| ret = s->cmos_data[s->cmos_index]; |
| break; |
| case RTC_REG_C: |
| ret = s->cmos_data[s->cmos_index]; |
| qemu_irq_lower(s->irq); |
| s->cmos_data[RTC_REG_C] = 0x00; |
| #ifdef TARGET_I386 |
| 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; |
| apic_reset_irq_delivered(); |
| DPRINTF_C("cmos: injecting on ack\n"); |
| qemu_irq_raise(s->irq); |
| if (apic_get_irq_delivered()) { |
| s->irq_coalesced--; |
| DPRINTF_C("cmos: coalesced irqs decreased to %d\n", |
| s->irq_coalesced); |
| } |
| } |
| #endif |
| 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 = DO_UPCAST(RTCState, dev, dev); |
| if (addr >= 0 && addr <= 127) |
| s->cmos_data[addr] = val; |
| } |
| |
| void rtc_set_date(ISADevice *dev, const struct tm *tm) |
| { |
| RTCState *s = DO_UPCAST(RTCState, dev, dev); |
| s->current_tm = *tm; |
| rtc_copy_date(s); |
| } |
| |
| /* PC cmos mappings */ |
| #define REG_IBM_CENTURY_BYTE 0x32 |
| #define REG_IBM_PS2_CENTURY_BYTE 0x37 |
| |
| static void rtc_set_date_from_host(ISADevice *dev) |
| { |
| RTCState *s = DO_UPCAST(RTCState, dev, dev); |
| struct tm tm; |
| int val; |
| |
| /* set the CMOS date */ |
| qemu_get_timedate(&tm, 0); |
| rtc_set_date(dev, &tm); |
| |
| val = rtc_to_bcd(s, (tm.tm_year / 100) + 19); |
| rtc_set_memory(dev, REG_IBM_CENTURY_BYTE, val); |
| rtc_set_memory(dev, REG_IBM_PS2_CENTURY_BYTE, val); |
| } |
| |
| static int rtc_post_load(void *opaque, int version_id) |
| { |
| #ifdef TARGET_I386 |
| RTCState *s = opaque; |
| |
| if (version_id >= 2) { |
| if (s->lost_tick_policy == LOST_TICK_SLEW) { |
| rtc_coalesced_timer_update(s); |
| } |
| } |
| #endif |
| return 0; |
| } |
| |
| static const VMStateDescription vmstate_rtc = { |
| .name = "mc146818rtc", |
| .version_id = 2, |
| .minimum_version_id = 1, |
| .minimum_version_id_old = 1, |
| .post_load = rtc_post_load, |
| .fields = (VMStateField []) { |
| VMSTATE_BUFFER(cmos_data, RTCState), |
| VMSTATE_UINT8(cmos_index, RTCState), |
| VMSTATE_INT32(current_tm.tm_sec, RTCState), |
| VMSTATE_INT32(current_tm.tm_min, RTCState), |
| VMSTATE_INT32(current_tm.tm_hour, RTCState), |
| VMSTATE_INT32(current_tm.tm_wday, RTCState), |
| VMSTATE_INT32(current_tm.tm_mday, RTCState), |
| VMSTATE_INT32(current_tm.tm_mon, RTCState), |
| VMSTATE_INT32(current_tm.tm_year, RTCState), |
| VMSTATE_TIMER(periodic_timer, RTCState), |
| VMSTATE_INT64(next_periodic_time, RTCState), |
| VMSTATE_INT64(next_second_time, RTCState), |
| VMSTATE_TIMER(second_timer, RTCState), |
| VMSTATE_TIMER(second_timer2, RTCState), |
| VMSTATE_UINT32_V(irq_coalesced, RTCState, 2), |
| VMSTATE_UINT32_V(period, RTCState, 2), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static void rtc_notify_clock_reset(Notifier *notifier, void *data) |
| { |
| RTCState *s = container_of(notifier, RTCState, clock_reset_notifier); |
| int64_t now = *(int64_t *)data; |
| |
| rtc_set_date_from_host(&s->dev); |
| s->next_second_time = now + (get_ticks_per_sec() * 99) / 100; |
| qemu_mod_timer(s->second_timer2, s->next_second_time); |
| rtc_timer_update(s, now); |
| #ifdef TARGET_I386 |
| if (s->lost_tick_policy == LOST_TICK_SLEW) { |
| rtc_coalesced_timer_update(s); |
| } |
| #endif |
| } |
| |
| 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); |
| |
| qemu_irq_lower(s->irq); |
| |
| #ifdef TARGET_I386 |
| if (s->lost_tick_policy == LOST_TICK_SLEW) { |
| s->irq_coalesced = 0; |
| } |
| #endif |
| } |
| |
| static const MemoryRegionPortio cmos_portio[] = { |
| {0, 2, 1, .read = cmos_ioport_read, .write = cmos_ioport_write }, |
| PORTIO_END_OF_LIST(), |
| }; |
| |
| static const MemoryRegionOps cmos_ops = { |
| .old_portio = cmos_portio |
| }; |
| |
| // FIXME add int32 visitor |
| static void visit_type_int32(Visitor *v, int *value, const char *name, Error **errp) |
| { |
| int64_t val = *value; |
| visit_type_int(v, &val, name, errp); |
| } |
| |
| static void rtc_get_date(Object *obj, Visitor *v, void *opaque, |
| const char *name, Error **errp) |
| { |
| ISADevice *isa = ISA_DEVICE(obj); |
| RTCState *s = DO_UPCAST(RTCState, dev, isa); |
| |
| visit_start_struct(v, NULL, "struct tm", name, 0, errp); |
| visit_type_int32(v, &s->current_tm.tm_year, "tm_year", errp); |
| visit_type_int32(v, &s->current_tm.tm_mon, "tm_mon", errp); |
| visit_type_int32(v, &s->current_tm.tm_mday, "tm_mday", errp); |
| visit_type_int32(v, &s->current_tm.tm_hour, "tm_hour", errp); |
| visit_type_int32(v, &s->current_tm.tm_min, "tm_min", errp); |
| visit_type_int32(v, &s->current_tm.tm_sec, "tm_sec", errp); |
| visit_end_struct(v, errp); |
| } |
| |
| static int rtc_initfn(ISADevice *dev) |
| { |
| RTCState *s = DO_UPCAST(RTCState, dev, 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; |
| |
| rtc_set_date_from_host(dev); |
| |
| #ifdef TARGET_I386 |
| switch (s->lost_tick_policy) { |
| case LOST_TICK_SLEW: |
| s->coalesced_timer = |
| qemu_new_timer_ns(rtc_clock, rtc_coalesced_timer, s); |
| break; |
| case LOST_TICK_DISCARD: |
| break; |
| default: |
| return -EINVAL; |
| } |
| #endif |
| |
| s->periodic_timer = qemu_new_timer_ns(rtc_clock, rtc_periodic_timer, s); |
| s->second_timer = qemu_new_timer_ns(rtc_clock, rtc_update_second, s); |
| s->second_timer2 = qemu_new_timer_ns(rtc_clock, rtc_update_second2, s); |
| |
| s->clock_reset_notifier.notify = rtc_notify_clock_reset; |
| qemu_register_clock_reset_notifier(rtc_clock, &s->clock_reset_notifier); |
| |
| s->next_second_time = |
| qemu_get_clock_ns(rtc_clock) + (get_ticks_per_sec() * 99) / 100; |
| qemu_mod_timer(s->second_timer2, s->next_second_time); |
| |
| memory_region_init_io(&s->io, &cmos_ops, s, "rtc", 2); |
| isa_register_ioport(dev, &s->io, base); |
| |
| qdev_set_legacy_instance_id(&dev->qdev, base, 2); |
| qemu_register_reset(rtc_reset, s); |
| |
| object_property_add(OBJECT(s), "date", "struct tm", |
| rtc_get_date, NULL, NULL, s, NULL); |
| |
| return 0; |
| } |
| |
| ISADevice *rtc_init(ISABus *bus, int base_year, qemu_irq intercept_irq) |
| { |
| ISADevice *dev; |
| RTCState *s; |
| |
| dev = isa_create(bus, "mc146818rtc"); |
| s = DO_UPCAST(RTCState, dev, dev); |
| qdev_prop_set_int32(&dev->qdev, "base_year", base_year); |
| qdev_init_nofail(&dev->qdev); |
| if (intercept_irq) { |
| s->irq = intercept_irq; |
| } else { |
| isa_init_irq(dev, &s->irq, RTC_ISA_IRQ); |
| } |
| return dev; |
| } |
| |
| 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_DISCARD), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void rtc_class_initfn(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| ISADeviceClass *ic = ISA_DEVICE_CLASS(klass); |
| ic->init = rtc_initfn; |
| dc->no_user = 1; |
| dc->vmsd = &vmstate_rtc; |
| dc->props = mc146818rtc_properties; |
| } |
| |
| static TypeInfo mc146818rtc_info = { |
| .name = "mc146818rtc", |
| .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) |
