root / hw / mc146818rtc.c @ 80cabfad
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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 <stdlib.h> |
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#include <stdio.h> |
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#include <stdarg.h> |
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#include <string.h> |
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#include <getopt.h> |
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#include <inttypes.h> |
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#include <unistd.h> |
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#include <sys/mman.h> |
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#include <fcntl.h> |
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#include <signal.h> |
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#include <time.h> |
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#include <sys/time.h> |
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#include <malloc.h> |
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#include <termios.h> |
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#include <sys/poll.h> |
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#include <errno.h> |
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#include <sys/wait.h> |
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#include <netinet/in.h> |
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#include "cpu.h" |
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#include "vl.h" |
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//#define DEBUG_CMOS
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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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#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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#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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/* PC cmos mappings */
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#define REG_IBM_CENTURY_BYTE 0x32 |
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#define REG_IBM_PS2_CENTURY_BYTE 0x37 |
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RTCState rtc_state; |
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static void cmos_ioport_write(CPUState *env, uint32_t addr, uint32_t data) |
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{ |
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RTCState *s = &rtc_state; |
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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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#ifdef DEBUG_CMOS
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printf("cmos: write index=0x%02x val=0x%02x\n",
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s->cmos_index, data); |
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#endif
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switch(addr) {
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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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/* XXX: not supported */
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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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break;
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case RTC_REG_A:
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case RTC_REG_B:
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s->cmos_data[s->cmos_index] = data; |
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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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static inline int to_bcd(int a) |
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{ |
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return ((a / 10) << 4) | (a % 10); |
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} |
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static void cmos_update_time(RTCState *s) |
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{ |
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struct tm *tm;
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time_t ti; |
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ti = time(NULL);
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tm = gmtime(&ti); |
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s->cmos_data[RTC_SECONDS] = to_bcd(tm->tm_sec); |
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s->cmos_data[RTC_MINUTES] = to_bcd(tm->tm_min); |
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s->cmos_data[RTC_HOURS] = to_bcd(tm->tm_hour); |
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s->cmos_data[RTC_DAY_OF_WEEK] = to_bcd(tm->tm_wday); |
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s->cmos_data[RTC_DAY_OF_MONTH] = to_bcd(tm->tm_mday); |
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s->cmos_data[RTC_MONTH] = to_bcd(tm->tm_mon + 1);
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s->cmos_data[RTC_YEAR] = to_bcd(tm->tm_year % 100);
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s->cmos_data[REG_IBM_CENTURY_BYTE] = to_bcd((tm->tm_year / 100) + 19); |
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s->cmos_data[REG_IBM_PS2_CENTURY_BYTE] = s->cmos_data[REG_IBM_CENTURY_BYTE]; |
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} |
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static uint32_t cmos_ioport_read(CPUState *env, uint32_t addr)
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{ |
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RTCState *s = &rtc_state; |
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int ret;
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if ((addr & 1) == 0) { |
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return 0xff; |
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} else {
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switch(s->cmos_index) {
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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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case REG_IBM_CENTURY_BYTE:
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case REG_IBM_PS2_CENTURY_BYTE:
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cmos_update_time(s); |
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ret = s->cmos_data[s->cmos_index]; |
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break;
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case RTC_REG_A:
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ret = s->cmos_data[s->cmos_index]; |
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/* toggle update-in-progress bit for Linux (same hack as
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plex86) */
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s->cmos_data[RTC_REG_A] ^= 0x80;
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break;
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case RTC_REG_C:
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ret = s->cmos_data[s->cmos_index]; |
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pic_set_irq(s->irq, 0);
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s->cmos_data[RTC_REG_C] = 0x00;
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break;
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default:
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ret = s->cmos_data[s->cmos_index]; |
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break;
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} |
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#ifdef DEBUG_CMOS
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printf("cmos: read index=0x%02x val=0x%02x\n",
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s->cmos_index, ret); |
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#endif
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return ret;
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} |
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} |
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void rtc_timer(void) |
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{ |
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RTCState *s = &rtc_state; |
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if (s->cmos_data[RTC_REG_B] & 0x50) { |
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pic_set_irq(s->irq, 1);
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} |
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} |
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void rtc_init(int base, int irq) |
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{ |
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RTCState *s = &rtc_state; |
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cmos_update_time(s); |
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s->irq = irq; |
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s->cmos_data[RTC_REG_A] = 0x26;
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s->cmos_data[RTC_REG_B] = 0x02;
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s->cmos_data[RTC_REG_C] = 0x00;
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s->cmos_data[RTC_REG_D] = 0x80;
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register_ioport_write(base, 2, cmos_ioport_write, 1); |
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register_ioport_read(base, 2, cmos_ioport_read, 1); |
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} |
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