diff options
| author | AJFISH <AJFISH@6f19259b-4bc3-4df7-8a09-765794883524> | 2009-12-06 01:57:05 +0000 |
|---|---|---|
| committer | AJFISH <AJFISH@6f19259b-4bc3-4df7-8a09-765794883524> | 2009-12-06 01:57:05 +0000 |
| commit | 2ef2b01e07c02db339f34004445734a2dbdd80e1 (patch) | |
| tree | 19532a6be8d8bdb0aef04bd00c1efb582f6dc841 /EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c | |
| parent | f7753a96ba1653ddd31b01c198a352f6332ac404 (diff) | |
| download | edk2-platforms-2ef2b01e07c02db339f34004445734a2dbdd80e1.tar.xz | |
Adding support for BeagleBoard.
ArmPkg - Supoprt for ARM specific things that can change as the architecture changes. Plus semihosting JTAG drivers.
EmbeddedPkg - Generic support for an embeddded platform. Including a light weight command line shell.
BeagleBoardPkg - Platform specifics for BeagleBoard. SD Card works, but USB has issues. Looks like a bug in the open source USB stack (Our internal stack works fine).
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9518 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c')
| -rw-r--r-- | EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c b/EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c new file mode 100644 index 0000000000..8e8f2dbf24 --- /dev/null +++ b/EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c @@ -0,0 +1,226 @@ +/** @file
+ Generic Monotonic Counter services
+
+ Copyright (c) 2007, Intel Corporation<BR>
+ Portions copyright (c) 2008-2009, Apple Inc. All rights reserved.
+
+ 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.
+
+
+**/
+
+
+//
+// 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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