diff options
Diffstat (limited to 'EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c')
| -rw-r--r-- | EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c b/EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c deleted file mode 100644 index 2b60d07203..0000000000 --- a/EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c +++ /dev/null @@ -1,226 +0,0 @@ -/** @file
- Generic Monotonic Counter services
-
- Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
- Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
-
- This program and the accompanying materials
- are licensed and made available under the terms and conditions of the BSD License
- which accompanies this distribution. The full text of the license may be found at
- http://opensource.org/licenses/bsd-license.php
-
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-
-
-**/
-
-
-//
-// The current Monotonic count value
-//
-UINT64 mEfiMtc = 0;
-
-
-//
-// Event to use to update the Mtc's high part when wrapping
-//
-EFI_EVENT mEfiMtcEvent;
-
-//
-// EfiMtcName - Variable name of the MTC value
-//
-CHAR16 *mEfiMtcName = L"MTC";
-
-//
-// EfiMtcGuid - Guid of the MTC value
-//
-EFI_GUID mEfiMtcGuid = { 0xeb704011, 0x1402, 0x11d3, { 0x8e, 0x77, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } };
-
-
-
-//
-// Worker functions
-//
-
-
-VOID
-EFIAPI
-EfiMtcEventHandler (
- IN EFI_EVENT Event,
- IN VOID *Context
- )
-/*++
-
-Routine Description:
-
- Monotonic count event handler. This handler updates the high monotonic count.
-
-Arguments:
-
- Event The event to handle
- Context The event context
-
-Returns:
-
- EFI_SUCCESS The event has been handled properly
- EFI_NOT_FOUND An error occurred updating the variable.
-
---*/
-{
- UINT32 HighCount;
-
- EfiGetNextHighMonotonicCount (&HighCount);
- return;
-}
-
-
-
-VOID
-LibMtcVirtualAddressChangeEvent (VOID)
-{
-}
-
-
-EFI_STATUS
-EFIAPI
-LibMtcGetNextHighMonotonicCount (
- OUT UINT32 *HighCount
- )
-{
- EFI_STATUS Status;
- EFI_TPL OldTpl;
-
- //
- // Check input parameters
- //
- if (HighCount == NULL) {
- return EFI_INVALID_PARAMETER;
- }
-
-
- if (!EfiAtRuntime ()) {
- // Use a lock if called before ExitBootServices()
- OldTpl = gBS->RaiseTPL (EFI_TPL_HIGH_LEVEL);
- }
-
- *HighCount = (UINT32) RShiftU64 (mEfiMtc, 32) + 1;
- mEfiMtc = LShiftU64 (*HighCount, 32);
-
- if (!EfiAtRuntime ()) {
- gBS->RestoreTPL (OldTpl);
- }
-
- //
- // Update the NvRam store to match the new high part
- //
- Status = EfiSetVariable (
- mEfiMtcName,
- &mEfiMtcGuid,
- EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS,
- sizeof (UINT32),
- HighCount
- );
-
- return Status;
-}
-
-
-EFI_STATUS
-LibMtcGetNextMonotonicCount (
- OUT UINT64 *Count
- )
-{
- EFI_STATUS Status;
- EFI_TPL OldTpl;
- UINT32 HighCount;
- UINTN BufferSize;
-
- //
- // Can not be called after ExitBootServices()
- //
- if (EfiAtRuntime ()) {
- return EFI_UNSUPPORTED;
- }
-
- //
- // Check input parameters
- //
- if (Count == NULL) {
- return EFI_INVALID_PARAMETER;
- }
-
- if (mEfiMtc == 0) {
- //
- // If the MTC has not been initialized read the variable
- //
-
- //
- // Read the last high part
- //
- BufferSize = sizeof (UINT32);
- Status = EfiGetVariable (
- mEfiMtcName,
- &mEfiMtcGuid,
- NULL,
- &BufferSize,
- &HighCount
- );
- if (EFI_ERROR (Status)) {
- HighCount = 0;
- }
-
- //
- // Set the current value
- //
- mEfiMtc = LShiftU64 (HighCount, 32);
- //
- // Increment the upper 32 bits for this boot
- // Continue even if it fails. It will only fail if the variable services are
- // not functional.
- //
- Status = EfiGetNextHighMonotonicCount (&HighCount);
- }
-
-
- //
- // Update the monotonic counter with a lock
- //
- OldTpl = gBS->RaiseTPL (EFI_TPL_HIGH_LEVEL);
- *Count = mEfiMtc;
- mEfiMtc++;
- gBS->RestoreTPL (OldTpl);
-
- //
- // If the MSB bit of the low part toggled, then signal that the high
- // part needs updated now
- //
- if ((((UINT32) mEfiMtc) ^ ((UINT32) *Count)) & 0x80000000) {
- gBS->SignalEvent (mEfiMtcEvent);
- }
-
- return EFI_SUCCESS;
-}
-
-
-
-VOID
-LibMtcInitialize (
- VOID
- )
-{
- EFI_STATUS Status;
-
- //
- // Initialize event to handle overflows
- //
- Status = gBS->CreateEvent (
- EVT_NOTIFY_SIGNAL,
- EFI_TPL_CALLBACK,
- EfiMtcEventHandler,
- NULL,
- &mEfiMtcEvent
- );
- ASSERT_EFI_ERROR (Status);
-}
-
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