mc146818.cc (6617:6d3645f68654) mc146818.cc (6620:ade9a088bb14)
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;

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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;

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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
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)
49{
48{
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}
55
54
55void
56MC146818::setTime(const struct tm time)
57{
58 curTime = time;
56 year = time.tm_year;
59 year = time.tm_year;
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
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
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);
78 DPRINTFN("Real-time clock set to %s", asctime(&time));
79}
80
81MC146818::~MC146818()
82{
83}
84
85void

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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

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152 return 0x00;
153 break;
154 default:
155 panic("Shouldn't be here");
156 }
157 }
158}
159
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
144void
178void
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
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

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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

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229 parent->handleEvent();
230}
231
232const char *
233MC146818::RTCEvent::description() const
234{
235 return "RTC interrupt";
236}
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}