/**
Initialize CPU local APIC timer.
**/
VOID
InitializeDebugTimer (
VOID
)
{
UINTN ApicTimerDivisor;
UINT32 InitialCount;
GetApicTimerState (&ApicTimerDivisor, NULL, NULL);
//
// Cpu Local Apic timer interrupt frequency, it is set to 0.1s
//
InitialCount = (UINT32)DivU64x32 (
MultU64x64 (
PcdGet32(PcdFSBClock) / (UINT32)ApicTimerDivisor,
100
),
1000
);
InitializeApicTimer (ApicTimerDivisor, InitialCount, TRUE, DEBUG_TIMER_VECTOR);
if (MultiProcessorDebugSupport) {
mDebugMpContext.DebugTimerInitCount = InitialCount;
}
}
EFIAPI
SecPlatformMain (
IN OUT EFI_SEC_PEI_HAND_OFF *SecCoreData
)
{
EFI_PEI_PPI_DESCRIPTOR *PpiList;
InitializeApicTimer (0, (UINT32) -1, TRUE, 5);
PpiList = &mPeiSecPlatformPpi[0];
return PpiList;
}
/**
Initialize CPU local APIC timer.
@param[out] TimerFrequency Local APIC timer frequency returned.
@param[in] DumpFlag If TRUE, dump Local APIC timer's parameter.
@return 32-bit Local APIC timer init count.
**/
UINT32
InitializeDebugTimer (
OUT UINT32 *TimerFrequency,
IN BOOLEAN DumpFlag
)
{
UINTN ApicTimerDivisor;
UINT32 InitialCount;
UINT32 ApicTimerFrequency;
InitializeLocalApicSoftwareEnable (TRUE);
GetApicTimerState (&ApicTimerDivisor, NULL, NULL);
ApicTimerFrequency = PcdGet32(PcdFSBClock) / (UINT32)ApicTimerDivisor;
//
// Cpu Local Apic timer interrupt frequency, it is set to 0.1s
//
InitialCount = (UINT32)DivU64x32 (
MultU64x64 (
ApicTimerFrequency,
DEBUG_TIMER_INTERVAL
),
1000000u
);
InitializeApicTimer (ApicTimerDivisor, InitialCount, TRUE, DEBUG_TIMER_VECTOR);
//
// Disable Debug Timer interrupt to avoid it is delivered before Debug Port
// is initialized
//
DisableApicTimerInterrupt ();
if (DumpFlag) {
DEBUG ((EFI_D_INFO, "Debug Timer: FSB Clock = %d\n", PcdGet32(PcdFSBClock)));
DEBUG ((EFI_D_INFO, "Debug Timer: Divisor = %d\n", ApicTimerDivisor));
DEBUG ((EFI_D_INFO, "Debug Timer: Frequency = %d\n", ApicTimerFrequency));
DEBUG ((EFI_D_INFO, "Debug Timer: InitialCount = %d\n", InitialCount));
}
if (TimerFrequency != NULL) {
*TimerFrequency = ApicTimerFrequency;
}
return InitialCount;
}