diff options
author | Guo Mang <mang.guo@intel.com> | 2016-12-22 15:57:14 +0800 |
---|---|---|
committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:41 +0800 |
commit | 1760cf81e4b1847c6823ea3514a78dd120e19b6e (patch) | |
tree | 64a874b14050fe24d3bbc1bc13cd293abf8ae018 /Core/MdePkg/Library/SmmServicesTableLib/SmmServicesTableLib.c | |
parent | 7f05fa00f73038b425002566d3afe6c3ade2ccdb (diff) | |
download | edk2-platforms-1760cf81e4b1847c6823ea3514a78dd120e19b6e.tar.xz |
MdePkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/MdePkg/Library/SmmServicesTableLib/SmmServicesTableLib.c')
-rw-r--r-- | Core/MdePkg/Library/SmmServicesTableLib/SmmServicesTableLib.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/SmmServicesTableLib/SmmServicesTableLib.c b/Core/MdePkg/Library/SmmServicesTableLib/SmmServicesTableLib.c new file mode 100644 index 0000000000..81e5ce8e3f --- /dev/null +++ b/Core/MdePkg/Library/SmmServicesTableLib/SmmServicesTableLib.c @@ -0,0 +1,85 @@ +/** @file
+ SMM Services Table Library.
+
+ Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
+ 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.
+
+**/
+
+#include <PiSmm.h>
+#include <Protocol/SmmBase2.h>
+#include <Library/SmmServicesTableLib.h>
+#include <Library/DebugLib.h>
+
+EFI_SMM_SYSTEM_TABLE2 *gSmst = NULL;
+
+/**
+ The constructor function caches the pointer of SMM Services Table.
+
+ @param ImageHandle The firmware allocated handle for the EFI image.
+ @param SystemTable A pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
+
+**/
+EFI_STATUS
+EFIAPI
+SmmServicesTableLibConstructor (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+ EFI_SMM_BASE2_PROTOCOL *InternalSmmBase2;
+
+ InternalSmmBase2 = NULL;
+ //
+ // Retrieve SMM Base2 Protocol, Do not use gBS from UefiBootServicesTableLib on purpose
+ // to prevent inclusion of gBS, gST, and gImageHandle from SMM Drivers unless the
+ // SMM driver explicity declares that dependency.
+ //
+ Status = SystemTable->BootServices->LocateProtocol (
+ &gEfiSmmBase2ProtocolGuid,
+ NULL,
+ (VOID **)&InternalSmmBase2
+ );
+ ASSERT_EFI_ERROR (Status);
+ ASSERT (InternalSmmBase2 != NULL);
+
+ //
+ // We are in SMM, retrieve the pointer to SMM System Table
+ //
+ InternalSmmBase2->GetSmstLocation (InternalSmmBase2, &gSmst);
+ ASSERT (gSmst != NULL);
+
+ return EFI_SUCCESS;
+}
+
+/**
+ This function allows the caller to determine if the driver is executing in
+ System Management Mode(SMM).
+
+ This function returns TRUE if the driver is executing in SMM and FALSE if the
+ driver is not executing in SMM.
+
+ @retval TRUE The driver is executing in System Management Mode (SMM).
+ @retval FALSE The driver is not executing in System Management Mode (SMM).
+
+**/
+BOOLEAN
+EFIAPI
+InSmm (
+ VOID
+ )
+{
+ //
+ // We are already in SMM
+ //
+ return TRUE;
+}
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