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