c03beb762a
that assumes the SMRAM reserved range is only at the end of the SMRAM descriptor.
//
// This range has reserved area, calculate the left free size
//
gSmmCorePrivate->SmramRanges[Index].PhysicalSize = SmramResRegion->SmramReservedStart - gSmmCorePrivate->SmramRanges[Index].CpuStart;
Imagine the following scenario where we just reserve the first page of the SMRAM range:
SMRAM Descriptor:
Start: 0x80000000
Size: 0x02000000
Reserved Range:
Start: 0x80000000
Size: 0x00001000
In this case the adjustment to the SMRAM range size yields zero: ReservedStart - SMRAM Start is 0x80000000 - 0x80000000 = 0.
So even though most of the range is still free the IPL code decides its unusable.
The problem comes from the email thread: [edk2] PiSmmIpl SMRAM Reservation Logic.
http://thread.gmane.org/gmane.comp.bios.tianocore.devel/15268
Also to follow the idea in the email thread, the patch is to
1. Keep only one copy of full SMRAM ranges in gSmmCorePrivate->SmramRanges,
split record for SmmConfiguration->SmramReservedRegions and SMM Core that
will be marked to be EFI_ALLOCATED in gSmmCorePrivate->SmramRanges.
2. Handle SmmConfiguration->SmramReservedRegions at beginning of, at end of,
in the middle of, or cross multiple SmramRanges.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18031 6f19259b-4bc3-4df7-8a09-765794883524
126 lines
5.6 KiB
C
126 lines
5.6 KiB
C
/** @file
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The internal header file that declared a data structure that is shared
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between the SMM IPL and the SMM Core.
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Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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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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#ifndef _PI_SMM_CORE_PRIVATE_DATA_H_
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#define _PI_SMM_CORE_PRIVATE_DATA_H_
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///
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/// Define values for the communications buffer used when gEfiEventDxeDispatchGuid is
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/// event signaled. This event is signaled by the DXE Core each time the DXE Core
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/// dispatcher has completed its work. When this event is signaled, the SMM Core
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/// if notified, so the SMM Core can dispatch SMM drivers. If COMM_BUFFER_SMM_DISPATCH_ERROR
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/// is returned in the communication buffer, then an error occurred dispatching SMM
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/// Drivers. If COMM_BUFFER_SMM_DISPATCH_SUCCESS is returned, then the SMM Core
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/// dispatched all the drivers it could. If COMM_BUFFER_SMM_DISPATCH_RESTART is
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/// returned, then the SMM Core just dispatched the SMM Driver that registered
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/// the SMM Entry Point enabling the use of SMM Mode. In this case, the SMM Core
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/// should be notified again to dispatch more SMM Drivers using SMM Mode.
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///
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#define COMM_BUFFER_SMM_DISPATCH_ERROR 0x00
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#define COMM_BUFFER_SMM_DISPATCH_SUCCESS 0x01
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#define COMM_BUFFER_SMM_DISPATCH_RESTART 0x02
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///
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/// Signature for the private structure shared between the SMM IPL and the SMM Core
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///
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#define SMM_CORE_PRIVATE_DATA_SIGNATURE SIGNATURE_32 ('s', 'm', 'm', 'c')
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///
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/// Private structure that is used to share information between the SMM IPL and
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/// the SMM Core. This structure is allocated from memory of type EfiRuntimeServicesData.
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/// Since runtime memory types are converted to available memory when a legacy boot
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/// is performed, the SMM Core must not access any fields of this structure if a legacy
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/// boot is performed. As a result, the SMM IPL must create an event notification
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/// for the Legacy Boot event and notify the SMM Core that a legacy boot is being
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/// performed. The SMM Core can then use this information to filter accesses to
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/// thos structure.
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///
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typedef struct {
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UINTN Signature;
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///
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/// The ImageHandle passed into the entry point of the SMM IPL. This ImageHandle
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/// is used by the SMM Core to fill in the ParentImageHandle field of the Loaded
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/// Image Protocol for each SMM Driver that is dispatched by the SMM Core.
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///
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EFI_HANDLE SmmIplImageHandle;
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///
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/// The number of SMRAM ranges passed from the SMM IPL to the SMM Core. The SMM
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/// Core uses these ranges of SMRAM to initialize the SMM Core memory manager.
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///
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UINTN SmramRangeCount;
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///
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/// A table of SMRAM ranges passed from the SMM IPL to the SMM Core. The SMM
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/// Core uses these ranges of SMRAM to initialize the SMM Core memory manager.
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///
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EFI_SMRAM_DESCRIPTOR *SmramRanges;
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///
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/// The SMM Foundation Entry Point. The SMM Core fills in this field when the
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/// SMM Core is initialized. The SMM IPL is responsbile for registering this entry
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/// point with the SMM Configuration Protocol. The SMM Configuration Protocol may
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/// not be available at the time the SMM IPL and SMM Core are started, so the SMM IPL
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/// sets up a protocol notification on the SMM Configuration Protocol and registers
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/// the SMM Foundation Entry Point as soon as the SMM Configuration Protocol is
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/// available.
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///
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EFI_SMM_ENTRY_POINT SmmEntryPoint;
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///
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/// Boolean flag set to TRUE while an SMI is being processed by the SMM Core.
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///
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BOOLEAN SmmEntryPointRegistered;
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///
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/// Boolean flag set to TRUE while an SMI is being processed by the SMM Core.
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///
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BOOLEAN InSmm;
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///
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/// This field is set by the SMM Core then the SMM Core is initialized. This field is
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/// used by the SMM Base 2 Protocol and SMM Communication Protocol implementations in
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/// the SMM IPL.
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///
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EFI_SMM_SYSTEM_TABLE2 *Smst;
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///
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/// This field is used by the SMM Communicatioon Protocol to pass a buffer into
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/// a software SMI handler and for the software SMI handler to pass a buffer back to
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/// the caller of the SMM Communication Protocol.
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///
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VOID *CommunicationBuffer;
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///
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/// This field is used by the SMM Communicatioon Protocol to pass the size of a buffer,
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/// in bytes, into a software SMI handler and for the software SMI handler to pass the
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/// size, in bytes, of a buffer back to the caller of the SMM Communication Protocol.
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///
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UINTN BufferSize;
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///
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/// This field is used by the SMM Communication Protocol to pass the return status from
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/// a software SMI handler back to the caller of the SMM Communication Protocol.
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///
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EFI_STATUS ReturnStatus;
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EFI_PHYSICAL_ADDRESS PiSmmCoreImageBase;
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UINT64 PiSmmCoreImageSize;
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EFI_PHYSICAL_ADDRESS PiSmmCoreEntryPoint;
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} SMM_CORE_PRIVATE_DATA;
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#endif
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