diff options
Diffstat (limited to 'EdkModulePkg/Universal/MonotonicCounter/RuntimeDxe/MonotonicCounter.c')
| -rw-r--r-- | EdkModulePkg/Universal/MonotonicCounter/RuntimeDxe/MonotonicCounter.c | 299 |
1 files changed, 0 insertions, 299 deletions
diff --git a/EdkModulePkg/Universal/MonotonicCounter/RuntimeDxe/MonotonicCounter.c b/EdkModulePkg/Universal/MonotonicCounter/RuntimeDxe/MonotonicCounter.c deleted file mode 100644 index 31efab323a..0000000000 --- a/EdkModulePkg/Universal/MonotonicCounter/RuntimeDxe/MonotonicCounter.c +++ /dev/null @@ -1,299 +0,0 @@ -/*++
-
-Copyright (c) 2006 - 2007, Intel Corporation
-All rights reserved. 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.
-
-Module Name:
-
- MonotonicCounter.c
-
-Abstract:
-
- Produced the Monotonic Counter Services as defined in the DXE CIS
-
-Revision History:
-
---*/
-
-#include "MonotonicCounter.h"
-
-//
-// The Monotonic Counter Handle
-//
-EFI_HANDLE mMonotonicCounterHandle = NULL;
-
-//
-// The current Monotonic count value
-//
-UINT64 mEfiMtc;
-
-//
-// Event to use to update the Mtc's high part when wrapping
-//
-EFI_EVENT mEfiMtcEvent;
-
-//
-// EfiMtcName - Variable name of the MTC value
-//
-CHAR16 *mEfiMtcName = (CHAR16 *) L"MTC";
-
-//
-// EfiMtcGuid - Guid of the MTC value
-//
-EFI_GUID mEfiMtcGuid = { 0xeb704011, 0x1402, 0x11d3, { 0x8e, 0x77, 0x0, 0xa0, 0xc9, 0x69, 0x72, 0x3b } };
-
-//
-// Worker functions
-//
-STATIC
-EFI_STATUS
-EFIAPI
-MonotonicCounterDriverGetNextMonotonicCount (
- OUT UINT64 *Count
- )
-/*++
-
-Routine Description:
-
-Arguments:
-
-Returns:
-
---*/
-{
- EFI_TPL OldTpl;
-
- //
- // Can not be called after ExitBootServices()
- //
- 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;
- 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;
-}
-
-
-/**
- Returns the next high 32 bits of the platform's monotonic counter.
-
- The GetNextHighMonotonicCount() function returns the next high 32 bits
- of the platform's monotonic counter. The platform's monotonic counter is
- comprised of two 32 bit quantities: the high 32 bits and the low 32 bits.
- During boot service time the low 32 bit value is volatile: it is reset to
- zero on every system reset and is increased by 1 on every call to GetNextMonotonicCount().
- The high 32 bit value is non-volatile and is increased by 1 whenever the system resets
- or whenever the low 32 bit count [returned by GetNextMonoticCount()] overflows.
- The GetNextMonotonicCount() function is only available at boot services time.
- If the operating system wishes to extend the platform monotonic counter to runtime,
- it may do so by utilizing GetNextHighMonotonicCount(). To do this, before calling
- ExitBootServices() the operating system would call GetNextMonotonicCount() to obtain
- the current platform monotonic count. The operating system would then provide an
- interface that returns the next count by:
- Adding 1 to the last count.
- Before the lower 32 bits of the count overflows, call GetNextHighMonotonicCount().
- This will increase the high 32 bits of the platform's non-volatile portion of the monotonic
- count by 1.
-
- This function may only be called at Runtime.
-
- @param[out] HighCount Pointer to returned value.
-
- @retval EFI_INVALID_PARAMETER If HighCount is NULL.
- @retval EFI_SUCCESS Operation is successful.
- @retval EFI_OUT_OF_RESOURCES If variable service reports that not enough storage
- is available to hold the variable and its data.
- @retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure.
-
-**/
-STATIC
-EFI_STATUS
-EFIAPI
-MonotonicCounterDriverGetNextHighMonotonicCount (
- OUT UINT32 *HighCount
- )
-/*++
-
-Routine Description:
-
-Arguments:
-
-Returns:
-
---*/
-{
- 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 (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);
- }
- //
- // Update the NvRam store to match the new high part
- //
- return EfiSetVariable (
- mEfiMtcName,
- &mEfiMtcGuid,
- EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS,
- sizeof (UINT32),
- HighCount
- );
-
-}
-
-STATIC
-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;
-
- MonotonicCounterDriverGetNextHighMonotonicCount (&HighCount);
-}
-
-EFI_STATUS
-EFIAPI
-MonotonicCounterDriverInitialize (
- IN EFI_HANDLE ImageHandle,
- IN EFI_SYSTEM_TABLE *SystemTable
- )
-/*++
-
-Routine Description:
-
-Arguments:
- (Standard EFI Image entry - EFI_IMAGE_ENTRY_POINT)
-
-Returns:
-
---*/
-{
- EFI_STATUS Status;
- UINT32 HighCount;
- UINTN BufferSize;
-
- //
- // Make sure the Monotonic Counter Architectural Protocol is not already installed in the system
- //
- ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiMonotonicCounterArchProtocolGuid);
-
- //
- // Initialize event to handle overflows
- //
- Status = gBS->CreateEvent (
- EVT_NOTIFY_SIGNAL,
- TPL_CALLBACK,
- EfiMtcEventHandler,
- NULL,
- &mEfiMtcEvent
- );
-
- ASSERT_EFI_ERROR (Status);
-
- //
- // 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 = MonotonicCounterDriverGetNextHighMonotonicCount (&HighCount);
-
- //
- // Fill in the EFI Boot Services and EFI Runtime Services Monotonic Counter Fields
- //
- gBS->GetNextMonotonicCount = MonotonicCounterDriverGetNextMonotonicCount;
- gRT->GetNextHighMonotonicCount = MonotonicCounterDriverGetNextHighMonotonicCount;
-
- //
- // Install the Monotonic Counter Architctural Protocol onto a new handle
- //
- Status = gBS->InstallMultipleProtocolInterfaces (
- &mMonotonicCounterHandle,
- &gEfiMonotonicCounterArchProtocolGuid,
- NULL,
- NULL
- );
- ASSERT_EFI_ERROR (Status);
-
- return EFI_SUCCESS;
-}
|