From 2ef2b01e07c02db339f34004445734a2dbdd80e1 Mon Sep 17 00:00:00 2001
From: AJFISH <AJFISH@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Sun, 6 Dec 2009 01:57:05 +0000
Subject: 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
---
 .../Library/HalRuntimeServicesExampleLib/Mtc.c     | 226 +++++++++++++++++++++
 1 file changed, 226 insertions(+)
 create mode 100644 EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c

(limited to 'EmbeddedPkg/Library/HalRuntimeServicesExampleLib/Mtc.c')

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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