cmos.c File Reference

#include <hal.h>
#include <debug.h>

Include dependency graph for cmos.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
	_Requires_lock_held_ (HalpSystemHardwareLock)
ULONG NTAPI	HalpGetCmosData (_In_ ULONG BusNumber, _In_ ULONG SlotNumber, _Out_writes_bytes_(Length) PVOID Buffer, _In_ ULONG Length)
ULONG NTAPI	HalpSetCmosData (IN ULONG BusNumber, IN ULONG SlotNumber, IN PVOID Buffer, IN ULONG Length)
INIT_FUNCTION VOID NTAPI	HalpInitializeCmos (VOID)
ARC_STATUS NTAPI	HalGetEnvironmentVariable (_In_ PCH Name, _In_ USHORT ValueLength, _Out_writes_z_(ValueLength) PCH Value)
ARC_STATUS NTAPI	HalSetEnvironmentVariable (IN PCH Name, IN PCH Value)
BOOLEAN NTAPI	HalQueryRealTimeClock (OUT PTIME_FIELDS Time)
BOOLEAN NTAPI	HalSetRealTimeClock (IN PTIME_FIELDS Time)

Variables
UCHAR	HalpCmosCenturyOffset

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 13 of file cmos.c.

Function Documentation

_Requires_lock_held_()

_Requires_lock_held_

(

HalpSystemHardwareLock

)

Definition at line 26 of file cmos.c.

{
    /* Select the register */
    WRITE_PORT_UCHAR(CMOS_CONTROL_PORT, Reg);

    /* Query the value */
    return READ_PORT_UCHAR(CMOS_DATA_PORT);
}

HalGetEnvironmentVariable()

ARC_STATUS NTAPI HalGetEnvironmentVariable	(	_In_ PCH	Name,
		_In_ USHORT	ValueLength,
		_Out_writes_z_(ValueLength) PCH	Value
	)

Definition at line 179 of file cmos.c.

{
    UCHAR Val;

    /* Only variable supported on x86 */
    if (_stricmp(Name, "LastKnownGood")) return ENOENT;

    /* Acquire CMOS Lock */
    HalpAcquireCmosSpinLock();

    /* Query the current value */
    Val = HalpReadCmos(RTC_REGISTER_B) & 0x01;

    /* Release CMOS lock */
    HalpReleaseCmosSpinLock();

    /* Check the flag */
    if (Val)
    {
        /* Return false */
        strncpy(Value, "FALSE", ValueLength);
    }
    else
    {
        /* Return true */
        strncpy(Value, "TRUE", ValueLength);
    }

    /* Return success */
    return ESUCCESS;
}

HalpGetCmosData()

ULONG NTAPI HalpGetCmosData	(	_In_ ULONG	BusNumber,
		_In_ ULONG	SlotNumber,
		_Out_writes_bytes_(Length) PVOID	Buffer,
		_In_ ULONG	Length
	)

Definition at line 53 of file cmos.c.

{
    PUCHAR Ptr = (PUCHAR)Buffer;
    ULONG Address = SlotNumber;
    ULONG Len = Length;

    /* Do nothing if we don't have a length */
    if (!Length) return 0;

    /* Acquire CMOS Lock */
    HalpAcquireCmosSpinLock();

    /* Check if this is simple CMOS */
    if (BusNumber == 0)
    {
        /* Loop the buffer up to 0xFF */
        while ((Len > 0) && (Address < 0x100))
        {
            /* Read the data */
            *Ptr = HalpReadCmos((UCHAR)Address);

            /* Update position and length */
            Ptr++;
            Address++;
            Len--;
        }
    }
    else if (BusNumber == 1)
    {
        /* Loop the buffer up to 0xFFFF */
        while ((Len > 0) && (Address < 0x10000))
        {
            /* Write the data */
            *Ptr = HalpReadCmos((UCHAR)Address);

            /* Update position and length */
            Ptr++;
            Address++;
            Len--;
        }
    }

    /* Release CMOS Lock */
    HalpReleaseCmosSpinLock();

    /* Return length read */
    return Length - Len;
}

HalpInitializeCmos()

INIT_FUNCTION VOID NTAPI HalpInitializeCmos

(

VOID

)

Definition at line 163 of file cmos.c.

{
    /* Set default century offset byte */
    HalpCmosCenturyOffset = 50;

    /* No support for EISA or MCA */
    ASSERT(HalpBusType == MACHINE_TYPE_ISA);
}

Referenced by HalInitSystem().

HalpSetCmosData()

ULONG NTAPI HalpSetCmosData	(	IN ULONG	BusNumber,
		IN ULONG	SlotNumber,
		IN PVOID	Buffer,
		IN ULONG	Length
	)

Definition at line 108 of file cmos.c.

{
    PUCHAR Ptr = (PUCHAR)Buffer;
    ULONG Address = SlotNumber;
    ULONG Len = Length;

    /* Do nothing if we don't have a length */
    if (!Length) return 0;

    /* Acquire CMOS Lock */
    HalpAcquireCmosSpinLock();

    /* Check if this is simple CMOS */
    if (BusNumber == 0)
    {
        /* Loop the buffer up to 0xFF */
        while ((Len > 0) && (Address < 0x100))
        {
            /* Write the data */
            HalpWriteCmos((UCHAR)Address, *Ptr);

            /* Update position and length */
            Ptr++;
            Address++;
            Len--;
        }
    }
    else if (BusNumber == 1)
    {
        /* Loop the buffer up to 0xFFFF */
        while ((Len > 0) && (Address < 0x10000))
        {
            /* Write the data */
            HalpWriteCmos((UCHAR)Address, *Ptr);

            /* Update position and length */
            Ptr++;
            Address++;
            Len--;
        }
    }

    /* Release CMOS Lock */
    HalpReleaseCmosSpinLock();

    /* Return length read */
    return Length - Len;
}

HalQueryRealTimeClock()

BOOLEAN NTAPI HalQueryRealTimeClock

(

OUT PTIME_FIELDS

Time

)

Definition at line 263 of file cmos.c.

{
    /* Acquire CMOS Lock */
    HalpAcquireCmosSpinLock();

    /* Loop while update is in progress */
    while ((HalpReadCmos(RTC_REGISTER_A)) & RTC_REG_A_UIP);

    /* Set the time data */
    Time->Second = BCD_INT(HalpReadCmos(0));
    Time->Minute = BCD_INT(HalpReadCmos(2));
    Time->Hour = BCD_INT(HalpReadCmos(4));
    Time->Weekday = BCD_INT(HalpReadCmos(6));
    Time->Day = BCD_INT(HalpReadCmos(7));
    Time->Month = BCD_INT(HalpReadCmos(8));
    Time->Year = BCD_INT(HalpReadCmos(9));
    Time->Milliseconds = 0;

    /* FIXME: Check century byte */

    /* Compensate for the century field */
    Time->Year += (Time->Year > 80) ? 1900: 2000;

    /* Release CMOS lock */
    HalpReleaseCmosSpinLock();

    /* Always return TRUE */
    return TRUE;
}

HalSetEnvironmentVariable()

ARC_STATUS NTAPI HalSetEnvironmentVariable	(	IN PCH	Name,
		IN PCH	Value
	)

Definition at line 219 of file cmos.c.

{
    UCHAR Val;

    /* Only variable supported on x86 */
    if (_stricmp(Name, "LastKnownGood")) return ENOMEM;

    /* Check if this is true or false */
    if (!_stricmp(Value, "TRUE"))
    {
        /* It's true, acquire CMOS lock */
        HalpAcquireCmosSpinLock();

        /* Read the current value and add the flag */
        Val = HalpReadCmos(RTC_REGISTER_B) | 1;
    }
    else if (!_stricmp(Value, "FALSE"))
    {
        /* It's false, acquire CMOS lock */
        HalpAcquireCmosSpinLock();

        /* Read the current value and mask out  the flag */
        Val = HalpReadCmos(RTC_REGISTER_B) & ~1;
    }
    else
    {
        /* Fail */
        return ENOMEM;
    }

    /* Write new value */
    HalpWriteCmos(RTC_REGISTER_B, Val);

    /* Release the lock and return success */
    HalpReleaseCmosSpinLock();
    return ESUCCESS;
}

HalSetRealTimeClock()

BOOLEAN NTAPI HalSetRealTimeClock

(

IN PTIME_FIELDS

Time

)

Definition at line 298 of file cmos.c.

{
    /* Acquire CMOS Lock */
    HalpAcquireCmosSpinLock();

    /* Loop while update is in progress */
    while ((HalpReadCmos(RTC_REGISTER_A)) & RTC_REG_A_UIP);

    /* Write time fields to CMOS RTC */
    HalpWriteCmos(0, INT_BCD(Time->Second));
    HalpWriteCmos(2, INT_BCD(Time->Minute));
    HalpWriteCmos(4, INT_BCD(Time->Hour));
    HalpWriteCmos(6, INT_BCD(Time->Weekday));
    HalpWriteCmos(7, INT_BCD(Time->Day));
    HalpWriteCmos(8, INT_BCD(Time->Month));
    HalpWriteCmos(9, INT_BCD(Time->Year % 100));

    /* FIXME: Set the century byte */

    /* Release CMOS lock */
    HalpReleaseCmosSpinLock();

    /* Always return TRUE */
    return TRUE;
}

Variable Documentation

HalpCmosCenturyOffset

UCHAR HalpCmosCenturyOffset

Definition at line 22 of file cmos.c.

Referenced by HalpInitializeCmos().