329 lines
7.6 KiB
NASM
329 lines
7.6 KiB
NASM
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title "ACPI Real Time Clock Functions"
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; pmclock.asm
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;
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; Abstract:
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;
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; This module implements the code for ACPI-related RTC
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; functions.
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;
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; Author:
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;
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; Jake Oshins (jakeo) March 28, 1997
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;
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; Environment:
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;
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; Kernel mode only.
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;
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; Revision History:
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;
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; Split from pmclock.asm due to PIIX4 bugs.
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;
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;--
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.386p
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.xlist
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include hal386.inc
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include callconv.inc ; calling convention macros
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include mac386.inc
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include i386\ix8259.inc
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include i386\ixcmos.inc
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include xxacpi.h
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.list
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extrn _HalpFixedAcpiDescTable:DWORD
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EXTRNP _DbgBreakPoint,0,IMPORT
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EXTRNP _HalpAcquireCmosSpinLock ,0
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EXTRNP _HalpReleaseCmosSpinLock ,0
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extrn _HalpRtcRegA:BYTE
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extrn _HalpRtcRegB:BYTE
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extrn _HalpCmosCenturyOffset:DWORD
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INIT SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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;++
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;
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; VOID
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; HalpInitializeCmos(
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; VOID
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; )
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;
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; This routine reads CMOS and initializes globals required for
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; CMOS access, such as the location of the century byte.
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;
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;--
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cPublicProc _HalpInitializeCmos,0
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cPublicFpo 0,0
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;
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; If the century byte is filled in, use it.
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;
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movzx eax, byte ptr [RTC_CENTURY]
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or al, al
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jnz short @f
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;
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; Assume default
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;
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mov eax, RTC_OFFSET_CENTURY
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@@:
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mov _HalpCmosCenturyOffset, eax
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stdRET _HalpInitializeCmos
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stdENDP _HalpInitializeCmos
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INIT ends
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_TEXT$03 SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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; NTSTATUS
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; HalpSetWakeAlarm (
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; IN ULONGLONG WakeSystemTime,
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; IN PTIME_FIELDS WakeTimeFields OPTIONAL
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; )
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; /*++
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;
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; Routine Description:
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;
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; This routine sets the real-time clock's alarm to go
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; off at a specified time in the future and programs
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; the ACPI chipset so that this wakes the computer.
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;
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; Arguments:
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;
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; WakeSystemTime - amount of time that passes before we wake
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; WakeTimeFields - time to wake broken down into TIME_FIELDS
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;
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; Return Value:
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;
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; status
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;
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; --*/
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WakeSystemTime equ [esp + 4]
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WakeTimeFields equ [esp + 12]
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cPublicProc _HalpSetWakeAlarm, 3
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cPublicFpo 3, 0
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if DBG
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hswawait0:
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mov ecx, 100
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hswawait:
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push ecx
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else
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hswawait:
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endif
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stdCall _HalpAcquireCmosSpinLock
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mov ecx, 100
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align 4
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hswa00: mov al, 0Ah ; Specify register A
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CMOS_READ ; (al) = CMOS register A
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test al, CMOS_STATUS_BUSY ; Is time update in progress?
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jz short hswa10 ; if z, no, go write CMOS time
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loop short hswa00 ; otherwise, try again.
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;
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; CMOS is still busy. Try again ...
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;
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stdCall _HalpReleaseCmosSpinLock
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if DBG
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pop ecx
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loop short hswawait
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stdCall _DbgBreakPoint
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jmp short hswawait0
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else
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jmp short hswawait
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endif
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align 4
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if DBG
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hswa10:
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pop ecx
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else
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hswa10:
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endif
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mov edx, WakeTimeFields ; (edx)-> TIME_FIELDS structure
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mov al, [edx].TfSecond ; Read second in TIME_FIELDS
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BIN_TO_BCD
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mov ah, al
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mov al, RTC_OFFSET_SECOND_ALARM
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CMOS_WRITE
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mov al, [edx].TfMinute ; Read minute in TIME_FIELDS
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BIN_TO_BCD
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mov ah, al
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mov al, RTC_OFFSET_MINUTE_ALARM
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CMOS_WRITE
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mov al, [edx].TfHour ; Read Hour in TIME_FIELDS
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BIN_TO_BCD
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mov ah, al
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mov al, RTC_OFFSET_HOUR_ALARM
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CMOS_WRITE
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; test to see if RTC_DAY_ALRM is supported
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mov cl, byte ptr [RTC_DAY_ALRM]
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or cl, cl
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jz hswa20
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mov al, [edx].TfDay ; Read day in TIME_FIELDS
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BIN_TO_BCD
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mov ah, al
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mov al, cl
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CMOS_WRITE
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; test to see if RTC_MON_ALRM is supported
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mov cl, byte ptr [RTC_MON_ALRM]
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or cl, cl
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jz hswa20
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mov al, [edx].TfMonth ; Read month in TIME_FIELDS
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BIN_TO_BCD
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mov ah, al
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mov al, cl
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CMOS_WRITE
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;
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; Don't clobber the Daylight Savings Time bit in register B, because we
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; stash the LastKnownGood "environment variable" there.
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;
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hswa20:
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mov ax, 0bh
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CMOS_READ
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and al, 1
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mov ah, al
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or ah, REGISTER_B_ENABLE_ALARM_INTERRUPT or REGISTER_B_24HOUR_MODE
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mov al, 0bh
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CMOS_WRITE ; Initialize it
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mov al,0CH ; Register C
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CMOS_READ ; Read to initialize
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mov al,0DH ; Register D
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CMOS_READ ; Read to initialize
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stdCall _HalpReleaseCmosSpinLock
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xor eax, eax ; return STATUS_SUCCESS
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stdRET _HalpSetWakeAlarm
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stdENDP _HalpSetWakeAlarm
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_TEXT$03 ends
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PAGELK SEGMENT DWORD PUBLIC 'CODE'
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ASSUME DS:FLAT, ES:FLAT, SS:NOTHING, FS:NOTHING, GS:NOTHING
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;++
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;
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; VOID
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; HalpSetClockBeforeSleep (
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; VOID
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; )
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;
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; Routine Description:
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;
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; This routine sets the RTC such that it will not generate
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; periodic interrupts while the machine is sleeping, as this
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; could be interpretted as an RTC wakeup event.
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;
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; Arguments:
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;
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; Return Value:
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;
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; None
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;
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;--
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cPublicProc _HalpSetClockBeforeSleep, 0
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cPublicFpo 0, 0
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stdCall _HalpAcquireCmosSpinLock
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mov al, 0ah
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CMOS_READ
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mov _HalpRtcRegA, al ; save RTC Register A
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or al, al
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jnz @f ; TEMP - debug stop
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int 3 ; looking for reg-a corruption
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@@:
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mov al, 0bh
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CMOS_READ
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mov _HalpRtcRegB, al ; save RTC Register B
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and al, not REGISTER_B_ENABLE_PERIODIC_INTERRUPT
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or al, REGISTER_B_24HOUR_MODE
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mov ah, al
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mov al, 0bh
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CMOS_WRITE ; Initialize it
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mov al,0CH ; Register C
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CMOS_READ ; Read to initialize
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mov al,0DH ; Register D
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CMOS_READ ; Read to initialize
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stdCall _HalpReleaseCmosSpinLock
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stdRET _HalpSetClockBeforeSleep
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stdENDP _HalpSetClockBeforeSleep
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;++
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;
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; VOID
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; HalpSetClockAfterSleep (
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; VOID
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; )
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;
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; Routine Description:
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;
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; This routine sets the RTC back to the way it was
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; before a call to HalpSetClockBeforeSleep.
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;
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; Arguments:
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;
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; Return Value:
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;
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; None
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;
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;--
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cPublicProc _HalpSetClockAfterSleep, 0
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cPublicFpo 0, 0
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stdCall _HalpAcquireCmosSpinLock
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mov ah, _HalpRtcRegA ; restore RTC Register A
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mov al, 0ah
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CMOS_WRITE
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mov ah, _HalpRtcRegB ; restore RTC Register B
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and ah, not REGISTER_B_ENABLE_ALARM_INTERRUPT
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or ah, REGISTER_B_24HOUR_MODE
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mov al, 0bh
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CMOS_WRITE ; Initialize it
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mov al,0CH ; Register C
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CMOS_READ ; Read to initialize
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mov al,0DH ; Register D
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CMOS_READ ; Read to initialize
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stdCall _HalpReleaseCmosSpinLock
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stdRET _HalpSetClockAfterSleep
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stdENDP _HalpSetClockAfterSleep
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PAGELK ends
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end
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