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Protected the cmos ports with a spinlock.

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svn path=/trunk/; revision=3849
This commit is contained in:
Hartmut Birr 2002-12-09 19:47:22 +00:00
parent 89fd93f5c7
commit 4386afd7cb
1 changed files with 40 additions and 6 deletions
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46
reactos/hal/halx86/time.c
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@ -32,6 +32,9 @@
#define RTC_REGISTER_CENTURY 0x32
/* GLOBALS ******************************************************************/
static KSPIN_LOCK CmosLock = {0};
/* FUNCTIONS *****************************************************************/
@ -105,9 +108,12 @@ HalpSetECMOS(USHORT Reg,
VOID STDCALL
HalQueryRealTimeClock(PTIME_FIELDS Time)
{
KIRQL oldIrql;
KeAcquireSpinLock(&CmosLock, &oldIrql);
/* check 'Update In Progress' bit */
while (HalpQueryCMOS (RTC_REGISTER_A) & RTC_REG_A_UIP)
;
while (HalpQueryCMOS (RTC_REGISTER_A) & RTC_REG_A_UIP);
Time->Second = BCD_INT(HalpQueryCMOS (0));
Time->Minute = BCD_INT(HalpQueryCMOS (2));
@ -127,6 +133,8 @@ HalQueryRealTimeClock(PTIME_FIELDS Time)
Time->Year += BCD_INT(HalpQueryCMOS (RTC_REGISTER_CENTURY)) * 100;
#endif
KeReleaseSpinLock(&CmosLock, oldIrql);
#ifndef NDEBUG
DbgPrint ("HalQueryRealTimeClock() %d:%d:%d %d/%d/%d\n",
Time->Hour,
@ -145,9 +153,12 @@ HalQueryRealTimeClock(PTIME_FIELDS Time)
VOID STDCALL
HalSetRealTimeClock(PTIME_FIELDS Time)
{
KIRQL oldIrql;
KeAcquireSpinLock(&CmosLock, &oldIrql);
/* check 'Update In Progress' bit */
while (HalpQueryCMOS (RTC_REGISTER_A) & RTC_REG_A_UIP)
;
while (HalpQueryCMOS (RTC_REGISTER_A) & RTC_REG_A_UIP);
HalpSetCMOS (0, INT_BCD(Time->Second));
HalpSetCMOS (2, INT_BCD(Time->Minute));
@ -161,6 +172,8 @@ HalSetRealTimeClock(PTIME_FIELDS Time)
/* Century */
HalpSetCMOS (RTC_REGISTER_CENTURY, INT_BCD(Time->Year / 100));
#endif
KeReleaseSpinLock(&CmosLock, oldIrql);
}
@ -169,11 +182,15 @@ HalGetEnvironmentVariable(PCH Name,
PCH Value,
USHORT ValueLength)
{
KIRQL oldIrql;
if (_stricmp(Name, "LastKnownGood") != 0)
{
return FALSE;
}
KeAcquireSpinLock(&CmosLock, &oldIrql);
if (HalpQueryCMOS(RTC_REGISTER_B) & 0x01)
{
strncpy(Value, "FALSE", ValueLength);
@ -182,6 +199,7 @@ HalGetEnvironmentVariable(PCH Name,
{
strncpy(Value, "TRUE", ValueLength);
}
KeReleaseSpinLock(&CmosLock, oldIrql);
return TRUE;
}
@ -192,10 +210,14 @@ HalSetEnvironmentVariable(PCH Name,
PCH Value)
{
UCHAR Val;
KIRQL oldIrql;
BOOLEAN result = TRUE;
if (_stricmp(Name, "LastKnownGood") != 0)
return FALSE;
KeAcquireSpinLock(&CmosLock, &oldIrql);
Val = HalpQueryCMOS(RTC_REGISTER_B);
if (_stricmp(Value, "TRUE") == 0)
@ -203,9 +225,11 @@ HalSetEnvironmentVariable(PCH Name,
else if (_stricmp(Value, "FALSE") == 0)
HalpSetCMOS(RTC_REGISTER_B, Val & ~0x01);
else
return FALSE;
result = FALSE;
return TRUE;
KeReleaseSpinLock(&CmosLock, oldIrql);
return result;
}
@ -220,6 +244,7 @@ HalpGetCmosData(PBUS_HANDLER BusHandler,
PUCHAR Ptr = Buffer;
ULONG Address = SlotNumber;
ULONG Len = Length;
KIRQL oldIrql;
DPRINT("HalpGetCmosData() called.\n");
DPRINT(" BusNumber %lu\n", BusNumber);
@ -233,6 +258,7 @@ HalpGetCmosData(PBUS_HANDLER BusHandler,
if (BusNumber == 0)
{
/* CMOS */
KeAcquireSpinLock(&CmosLock, &oldIrql);
while ((Len > 0) && (Address < 0x100))
{
*Ptr = HalpQueryCMOS((UCHAR)Address);
@ -240,10 +266,12 @@ HalpGetCmosData(PBUS_HANDLER BusHandler,
Address++;
Len--;
}
KeReleaseSpinLock(&CmosLock, oldIrql);
}
else if (BusNumber == 1)
{
/* Extended CMOS */
KeAcquireSpinLock(&CmosLock, &oldIrql);
while ((Len > 0) && (Address < 0x1000))
{
*Ptr = HalpQueryECMOS((USHORT)Address);
@ -251,6 +279,7 @@ HalpGetCmosData(PBUS_HANDLER BusHandler,
Address++;
Len--;
}
KeReleaseSpinLock(&CmosLock, oldIrql);
}
return(Length - Len);
@ -268,6 +297,7 @@ HalpSetCmosData(PBUS_HANDLER BusHandler,
PUCHAR Ptr = (PUCHAR)Buffer;
ULONG Address = SlotNumber;
ULONG Len = Length;
KIRQL oldIrql;
DPRINT("HalpSetCmosData() called.\n");
DPRINT(" BusNumber %lu\n", BusNumber);
@ -281,6 +311,7 @@ HalpSetCmosData(PBUS_HANDLER BusHandler,
if (BusNumber == 0)
{
/* CMOS */
KeAcquireSpinLock(&CmosLock, &oldIrql);
while ((Len > 0) && (Address < 0x100))
{
HalpSetCMOS((UCHAR)Address, *Ptr);
@ -288,10 +319,12 @@ HalpSetCmosData(PBUS_HANDLER BusHandler,
Address++;
Len--;
}
KeReleaseSpinLock(&CmosLock, oldIrql);
}
else if (BusNumber == 1)
{
/* Extended CMOS */
KeAcquireSpinLock(&CmosLock, &oldIrql);
while ((Len > 0) && (Address < 0x1000))
{
HalpSetECMOS((USHORT)Address, *Ptr);
@ -299,6 +332,7 @@ HalpSetCmosData(PBUS_HANDLER BusHandler,
Address++;
Len--;
}
KeReleaseSpinLock(&CmosLock, oldIrql);
}
return(Length - Len);