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HPET driver was updated and included: 

Comparator register automatically grow without breaking main counter register, this allow other driver to use HPET main counter.
Timer register overflow handle.
32-bit HPET timer support.
TimerDriverSetTimerPeriod is changed to handle HPET timer interrupt delivered into real mode.

Signed-off-by: li-elvin
Reviewed-by: vanjeff


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12700 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
li-elvin 2011-11-15 07:58:00 +00:00
parent e846c180b9
commit 22fde64e92
1 changed files with 182 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

231
PcAtChipsetPkg/HpetTimerDxe/HpetTimer.c
View File

@ -183,11 +183,21 @@ EFI_TIMER_NOTIFY mTimerNotifyFunction = NULL;
UINT64 mTimerPeriod = 0;
///
/// Accumulates HPET timer ticks to account for time passed when the
/// HPET timer is disabled or when there is no timer notification function
/// registered.
/// The number of HPET timer ticks required for the current HPET rate specified by mTimerPeriod.
///
volatile UINT64 mTimerAccumulator = 0;
UINT64 mTimerCount;
///
/// Mask used for counter and comparator calculations to adjust for a 32-bit or 64-bit counter.
///
UINT64 mCounterMask;
///
/// The HPET main counter value from the most recent HPET timer interrupt.
///
volatile UINT64 mPreviousMainCounter;
volatile UINT64 mPreviousComparator;
///
/// The index of the HPET timer being managed by this driver.
@ -288,7 +298,10 @@ TimerInterruptHandler (
IN EFI_SYSTEM_CONTEXT SystemContext
)
{
UINT64 MainCounter;
UINT64 Comparator;
UINT64 TimerPeriod;
UINT64 Delta;
//
// Count number of ticks
@ -306,14 +319,50 @@ TimerInterruptHandler (
SendApicEoi ();
//
// Accumulate time from the HPET main counter value
// Disable HPET timer when adjusting the COMPARATOR value to prevent a missed interrupt
//
mTimerAccumulator += HpetRead (HPET_MAIN_COUNTER_OFFSET);
HpetEnable (FALSE);
//
// Reset HPET main counter to 0
// Capture main counter value
//
HpetWrite (HPET_MAIN_COUNTER_OFFSET, 0);
MainCounter = HpetRead (HPET_MAIN_COUNTER_OFFSET);
//
// Get the previous comparator counter
//
mPreviousComparator = HpetRead (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE);
//
// Set HPET COMPARATOR to the value required for the next timer tick
//
Comparator = (mPreviousComparator + mTimerCount) & mCounterMask;
if ((mPreviousMainCounter < MainCounter) && (mPreviousComparator > Comparator)) {
//
// When comparator overflows
//
HpetWrite (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE, Comparator);
} else if ((mPreviousMainCounter > MainCounter) && (mPreviousComparator < Comparator)) {
//
// When main counter overflows
//
HpetWrite (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE, (MainCounter + mTimerCount) & mCounterMask);
} else {
//
// When both main counter and comparator do not overflow or both do overflow
//
if (Comparator > MainCounter) {
HpetWrite (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE, Comparator);
} else {
HpetWrite (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE, (MainCounter + mTimerCount) & mCounterMask);
}
}
//
// Enable the HPET counter once the new COMPARATOR value has been set.
//
HpetEnable (TRUE);
//
// Check to see if there is a registered notification function
@ -322,14 +371,24 @@ TimerInterruptHandler (
//
// Compute time since last notification in 100 ns units (10 ^ -7)
//
if (MainCounter > mPreviousMainCounter) {
//
// Main counter does not overflow
//
Delta = MainCounter - mPreviousMainCounter;
} else {
//
// Main counter overflows, first usb, then add
//
Delta = (mCounterMask - mPreviousMainCounter) + MainCounter;
}
TimerPeriod = DivU64x32 (
MultU64x32 (
mTimerAccumulator,
Delta & mCounterMask,
mHpetGeneralCapabilities.Bits.CounterClockPeriod
),
100000000
);
mTimerAccumulator = 0;
//
// Call registered notification function passing in the time since the last
@ -337,6 +396,11 @@ TimerInterruptHandler (
//
mTimerNotifyFunction (TimerPeriod);
}
//
// Save main counter value
//
mPreviousMainCounter = MainCounter;
}
/**
@ -428,7 +492,9 @@ TimerDriverSetTimerPeriod (
IN UINT64 TimerPeriod
)
{
UINT64 TimerCount;
UINT64 MainCounter;
UINT64 Delta;
UINT64 CurrentComparator;
//
// Disable HPET timer when adjusting the timer period
@ -436,6 +502,29 @@ TimerDriverSetTimerPeriod (
HpetEnable (FALSE);
if (TimerPeriod == 0) {
if (mTimerPeriod != 0) {
//
// Check if there is possibly a pending interrupt
//
MainCounter = HpetRead (HPET_MAIN_COUNTER_OFFSET);
if (MainCounter < mPreviousMainCounter) {
Delta = (mCounterMask - mPreviousMainCounter) + MainCounter;
} else {
Delta = MainCounter - mPreviousMainCounter;
}
if ((Delta & mCounterMask) >= mTimerCount) {
//
// Interrupt still happens after disable HPET, wait to be processed
// Wait until interrupt is processed and comparator is increased
//
CurrentComparator = HpetRead (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE);
while (CurrentComparator == mPreviousComparator) {
CurrentComparator = HpetRead (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE);
CpuPause();
}
}
}
//
// If TimerPeriod is 0, then mask HPET Timer interrupts
//
@ -463,7 +552,7 @@ TimerDriverSetTimerPeriod (
// per tick of the HPET counter to determine the number of HPET counter ticks
// in TimerPeriod 100 ns units.
//
TimerCount = DivU64x32 (
mTimerCount = DivU64x32 (
MultU64x32 (TimerPeriod, 100000000),
mHpetGeneralCapabilities.Bits.CounterClockPeriod
);
@ -471,28 +560,16 @@ TimerDriverSetTimerPeriod (
//
// Program the HPET Comparator with the number of ticks till the next interrupt
//
HpetWrite (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE, TimerCount);
//
// Capture the number of ticks since the last HPET Timer interrupt before
// clearing the main counter. This value will be used in the next HPET
// timer interrupt handler to compute the total amount of time since the
// last HPET timer interrupt
//
mTimerAccumulator = HpetRead (HPET_MAIN_COUNTER_OFFSET);
//
// If the number of ticks since the last timer interrupt is greater than the
// timer period, reduce the number of ticks till the next interrupt to 1, so
// a timer interrupt will be generated as soon as the HPET counter is enabled.
//
if (mTimerAccumulator >= TimerCount) {
HpetWrite (HPET_MAIN_COUNTER_OFFSET, TimerCount - 1);
//
// Adjust the accumulator down by TimerCount ticks because TimerCount
// ticks will be added to the accumulator on the next interrupt
//
mTimerAccumulator -= TimerCount;
MainCounter = HpetRead (HPET_MAIN_COUNTER_OFFSET);
if (MainCounter > mPreviousMainCounter) {
Delta = MainCounter - mPreviousMainCounter;
} else {
Delta = (mCounterMask - mPreviousMainCounter) + MainCounter;
}
if ((Delta & mCounterMask) >= mTimerCount) {
HpetWrite (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE, (MainCounter + 1) & mCounterMask);
} else {
HpetWrite (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE, (mPreviousMainCounter + mTimerCount) & mCounterMask);
}
//
@ -585,8 +662,10 @@ TimerDriverGenerateSoftInterrupt (
IN EFI_TIMER_ARCH_PROTOCOL *This
)
{
UINT64 MainCounter;
EFI_TPL Tpl;
UINT64 TimerPeriod;
UINT64 Delta;
//
// Disable interrupts
@ -594,14 +673,9 @@ TimerDriverGenerateSoftInterrupt (
Tpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
//
// Read the current HPET main counter value
// Capture main counter value
//
mTimerAccumulator += HpetRead (HPET_MAIN_COUNTER_OFFSET);
//
// Reset HPET main counter to 0
//
HpetWrite (HPET_MAIN_COUNTER_OFFSET, 0);
MainCounter = HpetRead (HPET_MAIN_COUNTER_OFFSET);
//
// Check to see if there is a registered notification function
@ -610,14 +684,25 @@ TimerDriverGenerateSoftInterrupt (
//
// Compute time since last interrupt in 100 ns units (10 ^ -7)
//
if (MainCounter > mPreviousMainCounter) {
//
// Main counter does not overflow
//
Delta = MainCounter - mPreviousMainCounter;
} else {
//
// Main counter overflows, first usb, then add
//
Delta = (mCounterMask - mPreviousMainCounter) + MainCounter;
}
TimerPeriod = DivU64x32 (
MultU64x32 (
mTimerAccumulator,
Delta & mCounterMask,
mHpetGeneralCapabilities.Bits.CounterClockPeriod
),
100000000
);
mTimerAccumulator = 0;
//
// Call registered notification function passing in the time since the last
@ -626,6 +711,11 @@ TimerDriverGenerateSoftInterrupt (
mTimerNotifyFunction (TimerPeriod);
}
//
// Save main counter value
//
mPreviousMainCounter = MainCounter;
//
// Restore interrupts
//
@ -696,19 +786,24 @@ TimerDriverInitialize (
// Dump HPET Configuration Information
//
DEBUG_CODE (
DEBUG ((DEBUG_INFO, "HPET Base Address = %08x\n", PcdGet32 (PcdHpetBaseAddress)));
DEBUG ((DEBUG_INFO, " HPET_GENERAL_CAPABILITIES_ID = %016lx\n", mHpetGeneralCapabilities));
DEBUG ((DEBUG_INFO, " HPET_GENERAL_CONFIGURATION = %016lx\n", mHpetGeneralConfiguration.Uint64));
DEBUG ((DEBUG_INFO, " HPET_GENERAL_INTERRUPT_STATUS = %016lx\n", HpetRead (HPET_GENERAL_INTERRUPT_STATUS_OFFSET)));
DEBUG ((DEBUG_INFO, " HPET_MAIN_COUNTER = %016lx\n", HpetRead (HPET_MAIN_COUNTER_OFFSET)));
DEBUG ((DEBUG_INFO, "HPET Base Address = 0x%08x\n", PcdGet32 (PcdHpetBaseAddress)));
DEBUG ((DEBUG_INFO, " HPET_GENERAL_CAPABILITIES_ID = 0x%016lx\n", mHpetGeneralCapabilities));
DEBUG ((DEBUG_INFO, " HPET_GENERAL_CONFIGURATION = 0x%016lx\n", mHpetGeneralConfiguration.Uint64));
DEBUG ((DEBUG_INFO, " HPET_GENERAL_INTERRUPT_STATUS = 0x%016lx\n", HpetRead (HPET_GENERAL_INTERRUPT_STATUS_OFFSET)));
DEBUG ((DEBUG_INFO, " HPET_MAIN_COUNTER = 0x%016lx\n", HpetRead (HPET_MAIN_COUNTER_OFFSET)));
DEBUG ((DEBUG_INFO, " HPET Main Counter Period = %d (fs)\n", mHpetGeneralCapabilities.Bits.CounterClockPeriod));
for (TimerIndex = 0; TimerIndex <= mHpetGeneralCapabilities.Bits.NumberOfTimers; TimerIndex++) {
DEBUG ((DEBUG_INFO, " HPET_TIMER%d_CONFIGURATION = %016lx\n", TimerIndex, HpetRead (HPET_TIMER_CONFIGURATION_OFFSET + TimerIndex * HPET_TIMER_STRIDE)));
DEBUG ((DEBUG_INFO, " HPET_TIMER%d_COMPARATOR = %016lx\n", TimerIndex, HpetRead (HPET_TIMER_COMPARATOR_OFFSET + TimerIndex * HPET_TIMER_STRIDE)));
DEBUG ((DEBUG_INFO, " HPET_TIMER%d_MSI_ROUTE = %016lx\n", TimerIndex, HpetRead (HPET_TIMER_MSI_ROUTE_OFFSET + TimerIndex * HPET_TIMER_STRIDE)));
DEBUG ((DEBUG_INFO, " HPET_TIMER%d_CONFIGURATION = 0x%016lx\n", TimerIndex, HpetRead (HPET_TIMER_CONFIGURATION_OFFSET + TimerIndex * HPET_TIMER_STRIDE)));
DEBUG ((DEBUG_INFO, " HPET_TIMER%d_COMPARATOR = 0x%016lx\n", TimerIndex, HpetRead (HPET_TIMER_COMPARATOR_OFFSET + TimerIndex * HPET_TIMER_STRIDE)));
DEBUG ((DEBUG_INFO, " HPET_TIMER%d_MSI_ROUTE = 0x%016lx\n", TimerIndex, HpetRead (HPET_TIMER_MSI_ROUTE_OFFSET + TimerIndex * HPET_TIMER_STRIDE)));
}
);
//
// Capture the current HPET main counter value.
//
mPreviousMainCounter = HpetRead (HPET_MAIN_COUNTER_OFFSET);
//
// Determine the interrupt mode to use for the HPET Timer.
// Look for MSI first, then unused PIC mode interrupt, then I/O APIC mode interrupt
@ -801,8 +896,29 @@ TimerDriverInitialize (
//
mTimerConfiguration.Bits.InterruptEnable = 0;
mTimerConfiguration.Bits.PeriodicInterruptEnable = 0;
mTimerConfiguration.Bits.CounterSizeEnable = 1;
HpetWrite (HPET_TIMER_CONFIGURATION_OFFSET + mTimerIndex * HPET_TIMER_STRIDE, mTimerConfiguration.Uint64);
//
// Read the HPET Timer Capabilities and Configuration register back again.
// CounterSizeEnable will be read back as a 0 if it is a 32-bit only timer
//
mTimerConfiguration.Uint64 = HpetRead (HPET_TIMER_CONFIGURATION_OFFSET + mTimerIndex * HPET_TIMER_STRIDE);
if ((mTimerConfiguration.Bits.CounterSizeEnable == 1) && (sizeof (UINTN) == sizeof (UINT64))) {
DEBUG ((DEBUG_INFO, "Choose 64-bit HPET timer.\n"));
//
// 64-bit BIOS can use 64-bit HPET timer
//
mCounterMask = 0xffffffffffffffffULL;
//
// Set timer back to 64-bit
//
mTimerConfiguration.Bits.CounterSizeEnable = 0;
HpetWrite (HPET_TIMER_CONFIGURATION_OFFSET + mTimerIndex * HPET_TIMER_STRIDE, mTimerConfiguration.Uint64);
} else {
DEBUG ((DEBUG_INFO, "Choose 32-bit HPET timer.\n"));
mCounterMask = 0x00000000ffffffffULL;
}
//
// Install interrupt handler for selected HPET Timer
@ -832,12 +948,15 @@ TimerDriverInitialize (
DEBUG ((DEBUG_INFO, "HPET Interrupt Mode MSI\n"));
} else {
DEBUG ((DEBUG_INFO, "HPET Interrupt Mode I/O APIC\n"));
DEBUG ((DEBUG_INFO, "HPET I/O APIC IRQ = %02x\n", mTimerIrq));
DEBUG ((DEBUG_INFO, "HPET I/O APIC IRQ = 0x%02x\n", mTimerIrq));
}
DEBUG ((DEBUG_INFO, "HPET Interrupt Vector = %02x\n", PcdGet8 (PcdHpetLocalApicVector)));
DEBUG ((DEBUG_INFO, "HPET_TIMER%d_CONFIGURATION = %016lx\n", mTimerIndex, HpetRead (HPET_TIMER_CONFIGURATION_OFFSET + mTimerIndex * HPET_TIMER_STRIDE)));
DEBUG ((DEBUG_INFO, "HPET_TIMER%d_COMPARATOR = %016lx\n", mTimerIndex, HpetRead (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE)));
DEBUG ((DEBUG_INFO, "HPET_TIMER%d_MSI_ROUTE = %016lx\n", mTimerIndex, HpetRead (HPET_TIMER_MSI_ROUTE_OFFSET + mTimerIndex * HPET_TIMER_STRIDE)));
DEBUG ((DEBUG_INFO, "HPET Interrupt Vector = 0x%02x\n", PcdGet8 (PcdHpetLocalApicVector)));
DEBUG ((DEBUG_INFO, "HPET Counter Mask = 0x%016lx\n", mCounterMask));
DEBUG ((DEBUG_INFO, "HPET Timer Period = %d\n", mTimerPeriod));
DEBUG ((DEBUG_INFO, "HPET Timer Count = 0x%016lx\n", mTimerCount));
DEBUG ((DEBUG_INFO, "HPET_TIMER%d_CONFIGURATION = 0x%016lx\n", mTimerIndex, HpetRead (HPET_TIMER_CONFIGURATION_OFFSET + mTimerIndex * HPET_TIMER_STRIDE)));
DEBUG ((DEBUG_INFO, "HPET_TIMER%d_COMPARATOR = 0x%016lx\n", mTimerIndex, HpetRead (HPET_TIMER_COMPARATOR_OFFSET + mTimerIndex * HPET_TIMER_STRIDE)));
DEBUG ((DEBUG_INFO, "HPET_TIMER%d_MSI_ROUTE = 0x%016lx\n", mTimerIndex, HpetRead (HPET_TIMER_MSI_ROUTE_OFFSET + mTimerIndex * HPET_TIMER_STRIDE)));
//
// Wait for a few timer interrupts to fire before continuing