NtSetSystemTime

dcskm4200 · 2 июл 2007

hey,all
which REGISTER is the "NtSetSystemTime" finally controled?
apparently, the RTC - STATUS REGISTER B is not controling by the "NtSetSystemTime".
; RTC - STATUS REGISTER B
mov al, 0Bh
out 70h, al
in al, 71h

regards

dcskm4200 · 2 июл 2007

Offset Offset Field Function
Hex Dec size
00h 0 1 byte RTC seconds. Contains the seconds value of current time
01h 1 1 byte RTC seconds alarm. Contains the seconds value for the RTC alarm
02h 2 1 byte RTC minutes. Contains the minutes value of the current time
03h 3 1 byte RTC minutes alarm. Contains the minutes value for the RTC alarm
04h 4 1 byte RTC hours. Contains the hours value of the current time
05h 5 1 byte RTC hours alarm. Contains the hours value for the RTC alarm
06h 6 1 byte RTC day of week. Contains the current day of the week
07h 7 1 byte RTC date day. Contains day value of current date
08h 8 1 byte RTC date month. Contains the month value of current date
09h 9 1 byte RTC date year. Contains the year value of current date
0Ah 10 1 byte Status Register A
Bit 7 = Update in progress
(0 = Date and time can be read,
1 = Time update in progress)
Bits 6-4 = Time frequency divider (010 = 32.768KHz)
Bits 3-0 = Rate selection frequency
(0110 = 1.024KHz square wave frequency)
0Bh 11 1 byte Status Register B
Bit 7 = Clock update cycle
(0 = Update normally, 1 = Abort update in progress)
Bit 6 = Periodic interrupt
(0 = Disable interrupt (default), 1 = Enable interrupt)
Bit 5 = Alarm interrupt
(0 = Disable interrupt (default), 1 = Enable interrupt)
Bit 4 = Update ended interrupt
(0 = Disable interrupt (default), 1 = Enable interrupt)
Bit 3 = Status register A square wave frequency
(0 = Disable square wave (default), 1 = Enable square wave)
Bit 2 = 24 hour clock
(0 = 24 hour mode (default), 1 = 12 hour mode)
Bit 1 = Daylight savings time
(0 = Disable daylight savings (default),
1 = Enable daylight savings)
0Ch 12 1 byte Status Register C - Read only flags indicating system
status conditions
Bit 7 = IRQF flag
Bit 6 = PF flag
Bit 5 = AF flag
Bit 4 = UF flag
Bits 3-0 = Reserved
0Dh 13 1 byte Status Register D - Valid CMOS RAM flag on bit 7
(battery condition flag)
Bit 7 = Valid CMOS RAM flag
(0 = CMOS battery dead, 1 = CMOS battery power good)
Bit 6-0 = Reserved
0Eh 14 1 byte Diagnostic Status
Bit 7 = Real time clock power status
(0 = CMOS has not lost power, 1 = CMOS has lost power)
Bit 6 = CMOS checksum status
(0 = Checksum is good, 1 = Checksum is bad)
Bit 5 = POST configuration information status
(0 = Configuration information is valid,
1 = Configuration information in invalid)
Bit 4 = Memory size compare during POST
(0 = POST memory equals configuration,
1 = POST memory not equal to configuration)
Bit 3 = Fixed disk/adapter initialization
(0 = Initialization good, 1 = Initialization bad)
Bit 2 = CMOS time status indicator
(0 = Time is valid, 1 = Time is invalid)
Bit 1-0 = Reserved
0Fh 15 1 byte CMOS Shutdown Status
00h = Power on or soft reset
01h = Memory size pass
02h = Memory test pass
03h = Memory test fail
04h = POST complete; boot system
05h = JMP double word pointer with EOI
06h = Protected mode tests pass
07h = protected mode tests fail
08h = Memory size fail
09h = Int 15h block move
0Ah = JMP double word pointer without EOI
0Bh = Used by 80386
4Eh 78 1 byte Real Time Clock - Address 2
4Fh 79 1 byte Real Time Clock - Address 3
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which's one?

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NtSetSystemTime

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