diff options
Diffstat (limited to 'MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c')
| -rw-r--r-- | MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c | 52 |
1 files changed, 27 insertions, 25 deletions
diff --git a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c index f74b0b8a19..60b6e9350b 100644 --- a/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c +++ b/MdeModulePkg/Universal/MonotonicCounterRuntimeDxe/MonotonicCounter.c @@ -27,12 +27,12 @@ EFI_HANDLE mMonotonicCounterHandle = NULL; //
// The current monotonic counter value
//
-UINT64 mEfiMtc;
+UINT64 mEfiMtc;
//
// Event to update the monotonic Counter's high part when low part overflows.
//
-EFI_EVENT mEfiMtcEvent;
+EFI_EVENT mEfiMtcEvent;
/**
Returns a monotonically increasing count for the platform.
@@ -59,7 +59,7 @@ MonotonicCounterDriverGetNextMonotonicCount ( OUT UINT64 *Count
)
{
- EFI_TPL OldTpl;
+ EFI_TPL OldTpl;
//
// Cannot be called after ExitBootServices()
@@ -67,17 +67,19 @@ MonotonicCounterDriverGetNextMonotonicCount ( if (EfiAtRuntime ()) {
return EFI_UNSUPPORTED;
}
+
//
// Check input parameters
//
if (Count == NULL) {
return EFI_INVALID_PARAMETER;
}
+
//
// Update the monotonic counter with a lock
//
- OldTpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
- *Count = mEfiMtc;
+ OldTpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
+ *Count = mEfiMtc;
mEfiMtc++;
gBS->RestoreTPL (OldTpl);
@@ -85,14 +87,13 @@ MonotonicCounterDriverGetNextMonotonicCount ( // If the low 32-bit counter overflows (MSB bit toggled),
// then signal that the high part needs update now.
//
- if ((((UINT32) mEfiMtc) ^ ((UINT32) *Count)) & BIT31) {
+ if ((((UINT32)mEfiMtc) ^ ((UINT32)*Count)) & BIT31) {
gBS->SignalEvent (mEfiMtcEvent);
}
return EFI_SUCCESS;
}
-
/**
Returns the next high 32 bits of the platform's monotonic counter.
@@ -132,7 +133,7 @@ MonotonicCounterDriverGetNextHighMonotonicCount ( OUT UINT32 *HighCount
)
{
- EFI_TPL OldTpl;
+ EFI_TPL OldTpl;
//
// Check input parameters
@@ -145,14 +146,15 @@ MonotonicCounterDriverGetNextHighMonotonicCount ( //
// Use a lock if called before ExitBootServices()
//
- OldTpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
- *HighCount = (UINT32) RShiftU64 (mEfiMtc, 32) + 1;
- mEfiMtc = LShiftU64 (*HighCount, 32);
+ OldTpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
+ *HighCount = (UINT32)RShiftU64 (mEfiMtc, 32) + 1;
+ mEfiMtc = LShiftU64 (*HighCount, 32);
gBS->RestoreTPL (OldTpl);
} else {
- *HighCount = (UINT32) RShiftU64 (mEfiMtc, 32) + 1;
- mEfiMtc = LShiftU64 (*HighCount, 32);
+ *HighCount = (UINT32)RShiftU64 (mEfiMtc, 32) + 1;
+ mEfiMtc = LShiftU64 (*HighCount, 32);
}
+
//
// Update the NV variable to match the new high part
//
@@ -163,7 +165,6 @@ MonotonicCounterDriverGetNextHighMonotonicCount ( sizeof (UINT32),
HighCount
);
-
}
/**
@@ -176,8 +177,8 @@ MonotonicCounterDriverGetNextHighMonotonicCount ( VOID
EFIAPI
EfiMtcEventHandler (
- IN EFI_EVENT Event,
- IN VOID *Context
+ IN EFI_EVENT Event,
+ IN VOID *Context
)
{
UINT32 HighCount;
@@ -226,16 +227,17 @@ MonotonicCounterDriverInitialize ( // Read the last high part
//
BufferSize = sizeof (UINT32);
- Status = EfiGetVariable (
- MTC_VARIABLE_NAME,
- &gMtcVendorGuid,
- NULL,
- &BufferSize,
- &HighCount
- );
+ Status = EfiGetVariable (
+ MTC_VARIABLE_NAME,
+ &gMtcVendorGuid,
+ NULL,
+ &BufferSize,
+ &HighCount
+ );
if (EFI_ERROR (Status)) {
HighCount = 0;
}
+
//
// Set the current value
//
@@ -251,8 +253,8 @@ MonotonicCounterDriverInitialize ( //
// Fill in the EFI Boot Services and EFI Runtime Services Monotonic Counter Fields
//
- gBS->GetNextMonotonicCount = MonotonicCounterDriverGetNextMonotonicCount;
- gRT->GetNextHighMonotonicCount = MonotonicCounterDriverGetNextHighMonotonicCount;
+ gBS->GetNextMonotonicCount = MonotonicCounterDriverGetNextMonotonicCount;
+ gRT->GetNextHighMonotonicCount = MonotonicCounterDriverGetNextHighMonotonicCount;
//
// Install the Monotonic Counter Architctural Protocol onto a new handle
|