1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
|
/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
jxtime.c
Abstract:
This module implements the HAL set/query realtime clock routines for
a MIPS R3000 or R4000 Jazz system.
Author:
David N. Cutler (davec) 5-May-1991
Environment:
Kernel mode
Revision History:
--*/
#include "halp.h"
#include "jazzrtc.h"
#include "eisa.h"
//
// Define forward referenced procedure prototypes.
//
UCHAR
HalpReadClockRegister (
UCHAR Register
);
VOID
HalpWriteClockRegister (
UCHAR Register,
UCHAR Value
);
BOOLEAN
HalQueryRealTimeClock (
OUT PTIME_FIELDS TimeFields
)
/*++
Routine Description:
This routine queries the realtime clock.
N.B. This routine is required to provide any synchronization necessary
to query the realtime clock information.
Arguments:
TimeFields - Supplies a pointer to a time structure that receives
the realtime clock information.
Return Value:
If the power to the realtime clock has not failed, then the time
values are read from the realtime clock and a value of TRUE is
returned. Otherwise, a value of FALSE is returned.
--*/
{
UCHAR DataByte;
KIRQL OldIrql;
//
// If the realtime clock battery is still functioning, then read
// the realtime clock values, and return a function value of TRUE.
// Otherwise, return a function value of FALSE.
//
KeRaiseIrql(HIGH_LEVEL, &OldIrql);
DataByte = HalpReadClockRegister(RTC_CONTROL_REGISTERD);
if (((PRTC_CONTROL_REGISTER_D)(&DataByte))->ValidTime == 1) {
//
// Wait until the realtime clock is not being updated.
//
do {
DataByte = HalpReadClockRegister(RTC_CONTROL_REGISTERA);
} while (((PRTC_CONTROL_REGISTER_A)(&DataByte))->UpdateInProgress == 1);
//
// Read the realtime clock values.
//
TimeFields->Year = 1980 + (CSHORT)HalpReadClockRegister(RTC_YEAR);
TimeFields->Month = (CSHORT)HalpReadClockRegister(RTC_MONTH);
TimeFields->Day = (CSHORT)HalpReadClockRegister(RTC_DAY_OF_MONTH);
TimeFields->Weekday = (CSHORT)HalpReadClockRegister(RTC_DAY_OF_WEEK) - 1;
TimeFields->Hour = (CSHORT)HalpReadClockRegister(RTC_HOUR);
TimeFields->Minute = (CSHORT)HalpReadClockRegister(RTC_MINUTE);
TimeFields->Second = (CSHORT)HalpReadClockRegister(RTC_SECOND);
TimeFields->Milliseconds = 0;
KeLowerIrql(OldIrql);
return TRUE;
} else {
KeLowerIrql(OldIrql);
return FALSE;
}
}
BOOLEAN
HalSetRealTimeClock (
IN PTIME_FIELDS TimeFields
)
/*++
Routine Description:
This routine sets the realtime clock.
N.B. This routine is required to provide any synchronization necessary
to set the realtime clock information.
Arguments:
TimeFields - Supplies a pointer to a time structure that specifies the
realtime clock information.
Return Value:
If the power to the realtime clock has not failed, then the time
values are written to the realtime clock and a value of TRUE is
returned. Otherwise, a value of FALSE is returned.
--*/
{
UCHAR DataByte;
KIRQL OldIrql;
//
// If the realtime clock battery is still functioning, then write
// the realtime clock values, and return a function value of TRUE.
// Otherwise, return a function value of FALSE.
//
KeRaiseIrql(HIGH_LEVEL, &OldIrql);
DataByte = HalpReadClockRegister(RTC_CONTROL_REGISTERD);
if (((PRTC_CONTROL_REGISTER_D)(&DataByte))->ValidTime == 1) {
//
// Set the realtime clock control to set the time.
//
DataByte = 0;
((PRTC_CONTROL_REGISTER_B)(&DataByte))->HoursFormat = 1;
((PRTC_CONTROL_REGISTER_B)(&DataByte))->DataMode = 1;
((PRTC_CONTROL_REGISTER_B)(&DataByte))->SetTime = 1;
HalpWriteClockRegister(RTC_CONTROL_REGISTERB, DataByte);
//
// Write the realtime clock values.
//
HalpWriteClockRegister(RTC_YEAR, (UCHAR)(TimeFields->Year - 1980));
HalpWriteClockRegister(RTC_MONTH, (UCHAR)TimeFields->Month);
HalpWriteClockRegister(RTC_DAY_OF_MONTH, (UCHAR)TimeFields->Day);
HalpWriteClockRegister(RTC_DAY_OF_WEEK, (UCHAR)(TimeFields->Weekday + 1));
HalpWriteClockRegister(RTC_HOUR, (UCHAR)TimeFields->Hour);
HalpWriteClockRegister(RTC_MINUTE, (UCHAR)TimeFields->Minute);
HalpWriteClockRegister(RTC_SECOND, (UCHAR)TimeFields->Second);
//
// Set the realtime clock control to update the time.
//
((PRTC_CONTROL_REGISTER_B)(&DataByte))->SetTime = 0;
HalpWriteClockRegister(RTC_CONTROL_REGISTERB, DataByte);
KeLowerIrql(OldIrql);
return TRUE;
} else {
KeLowerIrql(OldIrql);
return FALSE;
}
}
UCHAR
HalpReadClockRegister (
UCHAR Register
)
/*++
Routine Description:
This routine reads the specified realtime clock register.
Arguments:
Register - Supplies the number of the register whose value is read.
Return Value:
The value of the register is returned as the function value.
--*/
{
//
// Insert the realtime clock register number, and write the value back
// to the EISA NMI enable register. This selects the realtime clock register
// that is read. Note this is a write only register and the EISA NMI
// is always enabled.
//
//
// TEMPTEMP Disable NMI's for now because this is causing machines in the
// build lab to get NMI's during boot.
//
Register |= 0x80;
WRITE_REGISTER_UCHAR(&((PEISA_CONTROL) HalpEisaControlBase)->NmiEnable,
Register);
//
// Read the realtime clock register value.
//
return READ_REGISTER_UCHAR((PUCHAR)HalpRealTimeClockBase);
}
VOID
HalpWriteClockRegister (
UCHAR Register,
UCHAR Value
)
/*++
Routine Description:
This routine writes the specified value to the specified realtime
clock register.
Arguments:
Register - Supplies the number of the register whose value is written.
Value - Supplies the value that is written to the specified register.
Return Value:
The value of the register is returned as the function value.
--*/
{
//
// Insert the realtime clock register number, and write the value back
// to the EISA NMI enable register. This selects the realtime clock
// register that is written. Note this is a write only register and
// the EISA NMI is always enabled.
//
Register |= 0x80;
WRITE_REGISTER_UCHAR(&((PEISA_CONTROL) HalpEisaControlBase)->NmiEnable,
Register);
//
// Write the realtime clock register value.
//
WRITE_REGISTER_UCHAR((PUCHAR)HalpRealTimeClockBase, Value);
return;
}
|
