diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/MdeModulePkg/Core/Dxe/Library/Library.c | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/MdeModulePkg/Core/Dxe/Library/Library.c')
| -rw-r--r-- | roms/edk2/MdeModulePkg/Core/Dxe/Library/Library.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/roms/edk2/MdeModulePkg/Core/Dxe/Library/Library.c b/roms/edk2/MdeModulePkg/Core/Dxe/Library/Library.c new file mode 100644 index 000000000..b7f0781ed --- /dev/null +++ b/roms/edk2/MdeModulePkg/Core/Dxe/Library/Library.c @@ -0,0 +1,100 @@ +/** @file
+ DXE Core library services.
+
+Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "DxeMain.h"
+
+//
+// Lock Stuff
+//
+/**
+ Initialize a basic mutual exclusion lock. Each lock
+ provides mutual exclusion access at it's task priority
+ level. Since there is no-premption (at any TPL) or
+ multiprocessor support, acquiring the lock only consists
+ of raising to the locks TPL.
+
+ @param Lock The EFI_LOCK structure to initialize
+
+ @retval EFI_SUCCESS Lock Owned.
+ @retval EFI_ACCESS_DENIED Reentrant Lock Acquisition, Lock not Owned.
+
+**/
+EFI_STATUS
+CoreAcquireLockOrFail (
+ IN EFI_LOCK *Lock
+ )
+{
+ ASSERT (Lock != NULL);
+ ASSERT (Lock->Lock != EfiLockUninitialized);
+
+ if (Lock->Lock == EfiLockAcquired) {
+ //
+ // Lock is already owned, so bail out
+ //
+ return EFI_ACCESS_DENIED;
+ }
+
+ Lock->OwnerTpl = CoreRaiseTpl (Lock->Tpl);
+
+ Lock->Lock = EfiLockAcquired;
+ return EFI_SUCCESS;
+}
+
+
+
+/**
+ Raising to the task priority level of the mutual exclusion
+ lock, and then acquires ownership of the lock.
+
+ @param Lock The lock to acquire
+
+ @return Lock owned
+
+**/
+VOID
+CoreAcquireLock (
+ IN EFI_LOCK *Lock
+ )
+{
+ ASSERT (Lock != NULL);
+ ASSERT (Lock->Lock == EfiLockReleased);
+
+ Lock->OwnerTpl = CoreRaiseTpl (Lock->Tpl);
+ Lock->Lock = EfiLockAcquired;
+}
+
+
+
+/**
+ Releases ownership of the mutual exclusion lock, and
+ restores the previous task priority level.
+
+ @param Lock The lock to release
+
+ @return Lock unowned
+
+**/
+VOID
+CoreReleaseLock (
+ IN EFI_LOCK *Lock
+ )
+{
+ EFI_TPL Tpl;
+
+ ASSERT (Lock != NULL);
+ ASSERT (Lock->Lock == EfiLockAcquired);
+
+ Tpl = Lock->OwnerTpl;
+
+ Lock->Lock = EfiLockReleased;
+
+ CoreRestoreTpl (Tpl);
+}
+
+
+
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