1/* 2 * Copyright (c) 2004-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Ali Saidi 29 * Andrew Schultz 30 * Miguel Serrano 31 */ 32 33#include <sys/time.h> 34#include <time.h> 35 36#include <string> 37 38#include "base/bitfield.hh" 39#include "base/time.hh" 40#include "base/trace.hh" 41#include "dev/mc146818.hh" 42#include "dev/rtcreg.h" 43 44using namespace std; 45
| 1/* 2 * Copyright (c) 2004-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Ali Saidi 29 * Andrew Schultz 30 * Miguel Serrano 31 */ 32 33#include <sys/time.h> 34#include <time.h> 35 36#include <string> 37 38#include "base/bitfield.hh" 39#include "base/time.hh" 40#include "base/trace.hh" 41#include "dev/mc146818.hh" 42#include "dev/rtcreg.h" 43 44using namespace std; 45
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46MC146818::MC146818(EventManager *em, const string &n, const struct tm time, 47 bool bcd, Tick frequency) 48 : EventManager(em), _name(n), event(this, frequency)
| 46static uint8_t 47bcdize(uint8_t val)
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49{
| 48{
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50 memset(clock_data, 0, sizeof(clock_data)); 51 stat_regA = RTCA_32768HZ | RTCA_1024HZ; 52 stat_regB = RTCB_PRDC_IE | RTCB_24HR; 53 if (!bcd) 54 stat_regB |= RTCB_BIN;
| 49 uint8_t result; 50 result = val % 10; 51 result += (val / 10) << 4; 52 return result; 53}
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55
| 54
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| 55void 56MC146818::setTime(const struct tm time) 57{ 58 curTime = time;
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56 year = time.tm_year;
| 59 year = time.tm_year;
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57 58 if (bcd) { 59 // The datasheet says that the year field can be either BCD or 60 // years since 1900. Linux seems to be happy with years since 61 // 1900. 62 year = year % 100; 63 int tens = year / 10; 64 int ones = year % 10; 65 year = (tens << 4) + ones; 66 } 67
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68 // Unix is 0-11 for month, data seet says start at 1 69 mon = time.tm_mon + 1; 70 mday = time.tm_mday; 71 hour = time.tm_hour; 72 min = time.tm_min; 73 sec = time.tm_sec; 74 75 // Datasheet says 1 is sunday 76 wday = time.tm_wday + 1; 77
| 60 // Unix is 0-11 for month, data seet says start at 1 61 mon = time.tm_mon + 1; 62 mday = time.tm_mday; 63 hour = time.tm_hour; 64 min = time.tm_min; 65 sec = time.tm_sec; 66 67 // Datasheet says 1 is sunday 68 wday = time.tm_wday + 1; 69
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| 70 if (!(stat_regB & RTCB_BIN)) { 71 // The datasheet says that the year field can be either BCD or 72 // years since 1900. Linux seems to be happy with years since 73 // 1900. 74 year = bcdize(year % 100); 75 mon = bcdize(mon); 76 mday = bcdize(mday); 77 hour = bcdize(hour); 78 min = bcdize(min); 79 sec = bcdize(sec); 80 } 81} 82 83MC146818::MC146818(EventManager *em, const string &n, const struct tm time, 84 bool bcd, Tick frequency) 85 : EventManager(em), _name(n), event(this, frequency), tickEvent(this) 86{ 87 memset(clock_data, 0, sizeof(clock_data)); 88 stat_regA = RTCA_32768HZ | RTCA_1024HZ; 89 stat_regB = RTCB_PRDC_IE | RTCB_24HR; 90 if (!bcd) 91 stat_regB |= RTCB_BIN; 92 93 setTime(time);
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78 DPRINTFN("Real-time clock set to %s", asctime(&time)); 79} 80 81MC146818::~MC146818() 82{ 83} 84 85void 86MC146818::writeData(const uint8_t addr, const uint8_t data) 87{ 88 if (addr < RTC_STAT_REGA) 89 clock_data[addr] = data; 90 else { 91 switch (addr) { 92 case RTC_STAT_REGA: 93 // The "update in progress" bit is read only. 94 if ((data & ~RTCA_UIP) != (RTCA_32768HZ | RTCA_1024HZ)) 95 panic("Unimplemented RTC register A value write!\n"); 96 replaceBits(stat_regA, data, 6, 0); 97 break; 98 case RTC_STAT_REGB: 99 if ((data & ~(RTCB_PRDC_IE | RTCB_SQWE)) != RTCB_24HR) 100 panic("Write to RTC reg B bits that are not implemented!\n"); 101 102 if (data & RTCB_PRDC_IE) { 103 if (!event.scheduled()) 104 event.scheduleIntr(); 105 } else { 106 if (event.scheduled()) 107 deschedule(event); 108 } 109 stat_regB = data; 110 break; 111 case RTC_STAT_REGC: 112 case RTC_STAT_REGD: 113 panic("RTC status registers C and D are not implemented.\n"); 114 break; 115 } 116 } 117} 118 119uint8_t 120MC146818::readData(uint8_t addr) 121{ 122 if (addr < RTC_STAT_REGA) 123 return clock_data[addr]; 124 else { 125 switch (addr) { 126 case RTC_STAT_REGA: 127 // toggle UIP bit for linux 128 stat_regA ^= RTCA_UIP; 129 return stat_regA; 130 break; 131 case RTC_STAT_REGB: 132 return stat_regB; 133 break; 134 case RTC_STAT_REGC: 135 case RTC_STAT_REGD: 136 return 0x00; 137 break; 138 default: 139 panic("Shouldn't be here"); 140 } 141 } 142} 143
| 94 DPRINTFN("Real-time clock set to %s", asctime(&time)); 95} 96 97MC146818::~MC146818() 98{ 99} 100 101void 102MC146818::writeData(const uint8_t addr, const uint8_t data) 103{ 104 if (addr < RTC_STAT_REGA) 105 clock_data[addr] = data; 106 else { 107 switch (addr) { 108 case RTC_STAT_REGA: 109 // The "update in progress" bit is read only. 110 if ((data & ~RTCA_UIP) != (RTCA_32768HZ | RTCA_1024HZ)) 111 panic("Unimplemented RTC register A value write!\n"); 112 replaceBits(stat_regA, data, 6, 0); 113 break; 114 case RTC_STAT_REGB: 115 if ((data & ~(RTCB_PRDC_IE | RTCB_SQWE)) != RTCB_24HR) 116 panic("Write to RTC reg B bits that are not implemented!\n"); 117 118 if (data & RTCB_PRDC_IE) { 119 if (!event.scheduled()) 120 event.scheduleIntr(); 121 } else { 122 if (event.scheduled()) 123 deschedule(event); 124 } 125 stat_regB = data; 126 break; 127 case RTC_STAT_REGC: 128 case RTC_STAT_REGD: 129 panic("RTC status registers C and D are not implemented.\n"); 130 break; 131 } 132 } 133} 134 135uint8_t 136MC146818::readData(uint8_t addr) 137{ 138 if (addr < RTC_STAT_REGA) 139 return clock_data[addr]; 140 else { 141 switch (addr) { 142 case RTC_STAT_REGA: 143 // toggle UIP bit for linux 144 stat_regA ^= RTCA_UIP; 145 return stat_regA; 146 break; 147 case RTC_STAT_REGB: 148 return stat_regB; 149 break; 150 case RTC_STAT_REGC: 151 case RTC_STAT_REGD: 152 return 0x00; 153 break; 154 default: 155 panic("Shouldn't be here"); 156 } 157 } 158} 159
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| 160static time_t 161mkutctime(struct tm *time) 162{ 163 time_t ret; 164 char *tz; 165 166 tz = getenv("TZ"); 167 setenv("TZ", "", 1); 168 tzset(); 169 ret = mktime(time); 170 if (tz) 171 setenv("TZ", tz, 1); 172 else 173 unsetenv("TZ"); 174 tzset(); 175 return ret; 176} 177
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144void
| 178void
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| 179MC146818::tickClock() 180{ 181 if (stat_regB & RTCB_NO_UPDT) 182 return; 183 time_t calTime = mkutctime(&curTime); 184 calTime++; 185 setTime(*gmtime(&calTime)); 186} 187 188void
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145MC146818::serialize(const string &base, ostream &os) 146{ 147 arrayParamOut(os, base + ".clock_data", clock_data, sizeof(clock_data)); 148 paramOut(os, base + ".stat_regA", stat_regA); 149 paramOut(os, base + ".stat_regB", stat_regB); 150} 151 152void 153MC146818::unserialize(const string &base, Checkpoint *cp, 154 const string §ion) 155{ 156 arrayParamIn(cp, section, base + ".clock_data", clock_data, 157 sizeof(clock_data)); 158 paramIn(cp, section, base + ".stat_regA", stat_regA); 159 paramIn(cp, section, base + ".stat_regB", stat_regB); 160 161 // We're not unserializing the event here, but we need to 162 // rescehedule the event since curTick was moved forward by the 163 // checkpoint 164 reschedule(event, curTick + event.interval); 165} 166 167MC146818::RTCEvent::RTCEvent(MC146818 * _parent, Tick i) 168 : parent(_parent), interval(i) 169{ 170 DPRINTF(MC146818, "RTC Event Initilizing\n"); 171 parent->schedule(this, curTick + interval); 172} 173 174void 175MC146818::RTCEvent::scheduleIntr() 176{ 177 parent->schedule(this, curTick + interval); 178} 179 180void 181MC146818::RTCEvent::process() 182{ 183 DPRINTF(MC146818, "RTC Timer Interrupt\n"); 184 parent->schedule(this, curTick + interval); 185 parent->handleEvent(); 186} 187 188const char * 189MC146818::RTCEvent::description() const 190{ 191 return "RTC interrupt"; 192}
| 189MC146818::serialize(const string &base, ostream &os) 190{ 191 arrayParamOut(os, base + ".clock_data", clock_data, sizeof(clock_data)); 192 paramOut(os, base + ".stat_regA", stat_regA); 193 paramOut(os, base + ".stat_regB", stat_regB); 194} 195 196void 197MC146818::unserialize(const string &base, Checkpoint *cp, 198 const string §ion) 199{ 200 arrayParamIn(cp, section, base + ".clock_data", clock_data, 201 sizeof(clock_data)); 202 paramIn(cp, section, base + ".stat_regA", stat_regA); 203 paramIn(cp, section, base + ".stat_regB", stat_regB); 204 205 // We're not unserializing the event here, but we need to 206 // rescehedule the event since curTick was moved forward by the 207 // checkpoint 208 reschedule(event, curTick + event.interval); 209} 210 211MC146818::RTCEvent::RTCEvent(MC146818 * _parent, Tick i) 212 : parent(_parent), interval(i) 213{ 214 DPRINTF(MC146818, "RTC Event Initilizing\n"); 215 parent->schedule(this, curTick + interval); 216} 217 218void 219MC146818::RTCEvent::scheduleIntr() 220{ 221 parent->schedule(this, curTick + interval); 222} 223 224void 225MC146818::RTCEvent::process() 226{ 227 DPRINTF(MC146818, "RTC Timer Interrupt\n"); 228 parent->schedule(this, curTick + interval); 229 parent->handleEvent(); 230} 231 232const char * 233MC146818::RTCEvent::description() const 234{ 235 return "RTC interrupt"; 236}
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| 237 238void 239MC146818::RTCTickEvent::process() 240{ 241 DPRINTF(MC146818, "RTC clock tick\n"); 242 parent->schedule(this, curTick + Clock::Int::s); 243 parent->tickClock(); 244} 245 246const char * 247MC146818::RTCTickEvent::description() const 248{ 249 return "RTC clock tick"; 250}
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