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-rw-r--r--hw/mc146818rtc.c463
1 files changed, 0 insertions, 463 deletions
diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
deleted file mode 100644
index 9d4cbed..0000000
--- a/hw/mc146818rtc.c
+++ /dev/null
@@ -1,463 +0,0 @@
-/*
- * QEMU MC146818 RTC emulation
- *
- * Copyright (c) 2003-2004 Fabrice Bellard
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-#include "vl.h"
-
-//#define DEBUG_CMOS
-
-#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
-
-struct RTCState {
- uint8_t cmos_data[128];
- uint8_t cmos_index;
- struct tm current_tm;
- int irq;
- /* periodic timer */
- QEMUTimer *periodic_timer;
- int64_t next_periodic_time;
- /* second update */
- int64_t next_second_time;
- QEMUTimer *second_timer;
- QEMUTimer *second_timer2;
-};
-
-static void rtc_set_time(RTCState *s);
-static void rtc_copy_date(RTCState *s);
-
-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)) {
- if (period_code <= 2)
- period_code += 7;
- /* period in 32 Khz cycles */
- period = 1 << (period_code - 1);
- /* compute 32 khz clock */
- cur_clock = muldiv64(current_time, 32768, ticks_per_sec);
- next_irq_clock = (cur_clock & ~(period - 1)) + period;
- s->next_periodic_time = muldiv64(next_irq_clock, ticks_per_sec, 32768) + 1;
- qemu_mod_timer(s->periodic_timer, s->next_periodic_time);
- } else {
- 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] |= 0xc0;
- pic_set_irq(s->irq, 1);
-}
-
-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 {
-#ifdef DEBUG_CMOS
- printf("cmos: write index=0x%02x val=0x%02x\n",
- s->cmos_index, data);
-#endif
- switch(s->cmos_index) {
- case RTC_SECONDS_ALARM:
- case RTC_MINUTES_ALARM:
- case RTC_HOURS_ALARM:
- /* XXX: not supported */
- 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(vm_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);
- }
- }
- s->cmos_data[RTC_REG_B] = data;
- rtc_timer_update(s, qemu_get_clock(vm_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 to_bcd(RTCState *s, int a)
-{
- if (s->cmos_data[RTC_REG_B] & 0x04) {
- return a;
- } else {
- return ((a / 10) << 4) | (a % 10);
- }
-}
-
-static inline int from_bcd(RTCState *s, int a)
-{
- if (s->cmos_data[RTC_REG_B] & 0x04) {
- 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 = from_bcd(s, s->cmos_data[RTC_SECONDS]);
- tm->tm_min = from_bcd(s, s->cmos_data[RTC_MINUTES]);
- tm->tm_hour = from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
- if (!(s->cmos_data[RTC_REG_B] & 0x02) &&
- (s->cmos_data[RTC_HOURS] & 0x80)) {
- tm->tm_hour += 12;
- }
- tm->tm_wday = from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]);
- tm->tm_mday = from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]);
- tm->tm_mon = from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
- tm->tm_year = from_bcd(s, s->cmos_data[RTC_YEAR]) + 100;
-}
-
-static void rtc_copy_date(RTCState *s)
-{
- const struct tm *tm = &s->current_tm;
-
- s->cmos_data[RTC_SECONDS] = to_bcd(s, tm->tm_sec);
- s->cmos_data[RTC_MINUTES] = to_bcd(s, tm->tm_min);
- if (s->cmos_data[RTC_REG_B] & 0x02) {
- /* 24 hour format */
- s->cmos_data[RTC_HOURS] = to_bcd(s, tm->tm_hour);
- } else {
- /* 12 hour format */
- s->cmos_data[RTC_HOURS] = to_bcd(s, tm->tm_hour % 12);
- if (tm->tm_hour >= 12)
- s->cmos_data[RTC_HOURS] |= 0x80;
- }
- s->cmos_data[RTC_DAY_OF_WEEK] = to_bcd(s, tm->tm_wday);
- s->cmos_data[RTC_DAY_OF_MONTH] = to_bcd(s, tm->tm_mday);
- s->cmos_data[RTC_MONTH] = to_bcd(s, tm->tm_mon + 1);
- s->cmos_data[RTC_YEAR] = to_bcd(s, tm->tm_year % 100);
-}
-
-/* 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 += 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 = (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_REG_B] & REG_B_AIE) {
- if (((s->cmos_data[RTC_SECONDS_ALARM] & 0xc0) == 0xc0 ||
- s->cmos_data[RTC_SECONDS_ALARM] == s->current_tm.tm_sec) &&
- ((s->cmos_data[RTC_MINUTES_ALARM] & 0xc0) == 0xc0 ||
- s->cmos_data[RTC_MINUTES_ALARM] == s->current_tm.tm_mon) &&
- ((s->cmos_data[RTC_HOURS_ALARM] & 0xc0) == 0xc0 ||
- s->cmos_data[RTC_HOURS_ALARM] == s->current_tm.tm_hour)) {
-
- s->cmos_data[RTC_REG_C] |= 0xa0;
- pic_set_irq(s->irq, 1);
- }
- }
-
- /* update ended interrupt */
- if (s->cmos_data[RTC_REG_B] & REG_B_UIE) {
- s->cmos_data[RTC_REG_C] |= 0x90;
- pic_set_irq(s->irq, 1);
- }
-
- /* clear update in progress bit */
- s->cmos_data[RTC_REG_A] &= ~REG_A_UIP;
-
- s->next_second_time += 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];
- pic_set_irq(s->irq, 0);
- s->cmos_data[RTC_REG_C] = 0x00;
- break;
- default:
- ret = s->cmos_data[s->cmos_index];
- break;
- }
-#ifdef DEBUG_CMOS
- printf("cmos: read index=0x%02x val=0x%02x\n",
- s->cmos_index, ret);
-#endif
- return ret;
- }
-}
-
-void rtc_set_memory(RTCState *s, int addr, int val)
-{
- if (addr >= 0 && addr <= 127)
- s->cmos_data[addr] = val;
-}
-
-void rtc_set_date(RTCState *s, const struct tm *tm)
-{
- s->current_tm = *tm;
- rtc_copy_date(s);
-}
-
-static void rtc_save(QEMUFile *f, void *opaque)
-{
- RTCState *s = opaque;
-
- qemu_put_buffer(f, s->cmos_data, 128);
- qemu_put_8s(f, &s->cmos_index);
-
- qemu_put_be32s(f, &s->current_tm.tm_sec);
- qemu_put_be32s(f, &s->current_tm.tm_min);
- qemu_put_be32s(f, &s->current_tm.tm_hour);
- qemu_put_be32s(f, &s->current_tm.tm_wday);
- qemu_put_be32s(f, &s->current_tm.tm_mday);
- qemu_put_be32s(f, &s->current_tm.tm_mon);
- qemu_put_be32s(f, &s->current_tm.tm_year);
-
- qemu_put_timer(f, s->periodic_timer);
- qemu_put_be64s(f, &s->next_periodic_time);
-
- qemu_put_be64s(f, &s->next_second_time);
- qemu_put_timer(f, s->second_timer);
- qemu_put_timer(f, s->second_timer2);
-}
-
-static int rtc_load(QEMUFile *f, void *opaque, int version_id)
-{
- RTCState *s = opaque;
-
- if (version_id != 1)
- return -EINVAL;
-
- qemu_get_buffer(f, s->cmos_data, 128);
- qemu_get_8s(f, &s->cmos_index);
-
- qemu_get_be32s(f, &s->current_tm.tm_sec);
- qemu_get_be32s(f, &s->current_tm.tm_min);
- qemu_get_be32s(f, &s->current_tm.tm_hour);
- qemu_get_be32s(f, &s->current_tm.tm_wday);
- qemu_get_be32s(f, &s->current_tm.tm_mday);
- qemu_get_be32s(f, &s->current_tm.tm_mon);
- qemu_get_be32s(f, &s->current_tm.tm_year);
-
- qemu_get_timer(f, s->periodic_timer);
- qemu_get_be64s(f, &s->next_periodic_time);
-
- qemu_get_be64s(f, &s->next_second_time);
- qemu_get_timer(f, s->second_timer);
- qemu_get_timer(f, s->second_timer2);
- return 0;
-}
-
-RTCState *rtc_init(int base, int irq)
-{
- RTCState *s;
-
- s = qemu_mallocz(sizeof(RTCState));
- if (!s)
- return NULL;
-
- s->irq = irq;
- 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;
-
- s->periodic_timer = qemu_new_timer(vm_clock,
- rtc_periodic_timer, s);
- s->second_timer = qemu_new_timer(vm_clock,
- rtc_update_second, s);
- s->second_timer2 = qemu_new_timer(vm_clock,
- rtc_update_second2, s);
-
- s->next_second_time = qemu_get_clock(vm_clock) + (ticks_per_sec * 99) / 100;
- qemu_mod_timer(s->second_timer2, s->next_second_time);
-
- register_ioport_write(base, 2, 1, cmos_ioport_write, s);
- register_ioport_read(base, 2, 1, cmos_ioport_read, s);
-
- register_savevm("mc146818rtc", base, 1, rtc_save, rtc_load, s);
- return s;
-}
-
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