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/** @file
PiSmmCommunication SMM Driver.
Copyright (c) 2010 - 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 <Library/UefiDriverEntryPoint.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/SmmServicesTableLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/HobLib.h>
#include <Library/DebugLib.h>
#include <Library/SmmMemLib.h>
#include <Library/PcdLib.h>
#include <Protocol/SmmSwDispatch2.h>
#include <Protocol/SmmReadyToLock.h>
#include <Protocol/SmmCommunication.h>
#include <Protocol/AcpiTable.h>
#include <Ppi/SmmCommunication.h>
#include <Guid/Acpi.h>
#include "PiSmmCommunicationPrivate.h"
EFI_SMM_COMMUNICATION_CONTEXT mSmmCommunicationContext = {
SMM_COMMUNICATION_SIGNATURE
};
EFI_SMM_COMMUNICATION_ACPI_TABLE mSmmCommunicationAcpiTable = {
{
{
EFI_ACPI_4_0_UEFI_ACPI_DATA_TABLE_SIGNATURE,
sizeof (EFI_SMM_COMMUNICATION_ACPI_TABLE),
0x1, // Revision
0x0, // Checksum
{0x0}, // OemId[6]
0x0, // OemTableId
0x0, // OemRevision
0x0, // CreatorId
0x0 // CreatorRevision
},
{0x0}, // Identifier
OFFSET_OF (EFI_SMM_COMMUNICATION_ACPI_TABLE, SwSmiNumber) // DataOffset
},
0x0, // SwSmiNumber
0x0 // BufferPtrAddress
};
/**
Set SMM communication context.
**/
VOID
SetCommunicationContext (
VOID
)
{
EFI_STATUS Status;
Status = gSmst->SmmInstallConfigurationTable (
gSmst,
&gEfiPeiSmmCommunicationPpiGuid,
&mSmmCommunicationContext,
sizeof(mSmmCommunicationContext)
);
ASSERT_EFI_ERROR (Status);
}
/**
Dispatch function for a Software SMI handler.
@param DispatchHandle The unique handle assigned to this handler by SmiHandlerRegister().
@param Context Points to an optional handler context which was specified when the
handler was registered.
@param CommBuffer A pointer to a collection of data in memory that will
be conveyed from a non-SMM environment into an SMM environment.
@param CommBufferSize The size of the CommBuffer.
@retval EFI_SUCCESS Command is handled successfully.
**/
EFI_STATUS
EFIAPI
PiSmmCommunicationHandler (
IN EFI_HANDLE DispatchHandle,
IN CONST VOID *Context OPTIONAL,
IN OUT VOID *CommBuffer OPTIONAL,
IN OUT UINTN *CommBufferSize OPTIONAL
)
{
UINTN CommSize;
EFI_STATUS Status;
EFI_SMM_COMMUNICATE_HEADER *CommunicateHeader;
EFI_PHYSICAL_ADDRESS *BufferPtrAddress;
DEBUG ((EFI_D_INFO, "PiSmmCommunicationHandler Enter\n"));
BufferPtrAddress = (EFI_PHYSICAL_ADDRESS *)(UINTN)mSmmCommunicationContext.BufferPtrAddress;
CommunicateHeader = (EFI_SMM_COMMUNICATE_HEADER *)(UINTN)*BufferPtrAddress;
DEBUG ((EFI_D_INFO, "PiSmmCommunicationHandler CommunicateHeader - %x\n", CommunicateHeader));
if (CommunicateHeader == NULL) {
DEBUG ((EFI_D_INFO, "PiSmmCommunicationHandler is NULL, needn't to call dispatch function\n"));
Status = EFI_SUCCESS;
} else {
if (!SmmIsBufferOutsideSmmValid ((UINTN)CommunicateHeader, OFFSET_OF (EFI_SMM_COMMUNICATE_HEADER, Data))) {
DEBUG ((EFI_D_INFO, "PiSmmCommunicationHandler CommunicateHeader invalid - 0x%x\n", CommunicateHeader));
Status = EFI_SUCCESS;
goto Done;
}
CommSize = (UINTN)CommunicateHeader->MessageLength;
if (!SmmIsBufferOutsideSmmValid ((UINTN)&CommunicateHeader->Data[0], CommSize)) {
DEBUG ((EFI_D_INFO, "PiSmmCommunicationHandler CommunicateData invalid - 0x%x\n", &CommunicateHeader->Data[0]));
Status = EFI_SUCCESS;
goto Done;
}
//
// Call dispatch function
//
DEBUG ((EFI_D_INFO, "PiSmmCommunicationHandler Data - %x\n", &CommunicateHeader->Data[0]));
Status = gSmst->SmiManage (
&CommunicateHeader->HeaderGuid,
NULL,
&CommunicateHeader->Data[0],
&CommSize
);
}
Done:
DEBUG ((EFI_D_INFO, "PiSmmCommunicationHandler %r\n", Status));
DEBUG ((EFI_D_INFO, "PiSmmCommunicationHandler Exit\n"));
return (Status == EFI_SUCCESS) ? EFI_SUCCESS : EFI_INTERRUPT_PENDING;
}
/**
Allocate EfiACPIMemoryNVS below 4G memory address.
This function allocates EfiACPIMemoryNVS below 4G memory address.
@param Size Size of memory to allocate.
@return Allocated address for output.
**/
VOID*
AllocateAcpiNvsMemoryBelow4G (
IN UINTN Size
)
{
UINTN Pages;
EFI_PHYSICAL_ADDRESS Address;
EFI_STATUS Status;
VOID* Buffer;
Pages = EFI_SIZE_TO_PAGES (Size);
Address = 0xffffffff;
Status = gBS->AllocatePages (
AllocateMaxAddress,
EfiACPIMemoryNVS,
Pages,
&Address
);
ASSERT_EFI_ERROR (Status);
Buffer = (VOID *) (UINTN) Address;
ZeroMem (Buffer, Size);
return Buffer;
}
/**
Entry Point for PI SMM communication SMM driver.
@param[in] ImageHandle Image handle of this driver.
@param[in] SystemTable A Pointer to the EFI System Table.
@retval EFI_SUCEESS
@return Others Some error occurs.
**/
EFI_STATUS
EFIAPI
PiSmmCommunicationSmmEntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_SMM_SW_DISPATCH2_PROTOCOL *SmmSwDispatch2;
EFI_SMM_SW_REGISTER_CONTEXT SmmSwDispatchContext;
EFI_HANDLE DispatchHandle;
EFI_ACPI_TABLE_PROTOCOL *AcpiTableProtocol;
UINTN TableKey;
UINT64 OemTableId;
EFI_PHYSICAL_ADDRESS *BufferPtrAddress;
CopyMem (
mSmmCommunicationAcpiTable.UefiAcpiDataTable.Header.OemId,
PcdGetPtr (PcdAcpiDefaultOemId),
sizeof (mSmmCommunicationAcpiTable.UefiAcpiDataTable.Header.OemId)
);
OemTableId = PcdGet64 (PcdAcpiDefaultOemTableId);
CopyMem (&mSmmCommunicationAcpiTable.UefiAcpiDataTable.Header.OemTableId, &OemTableId, sizeof (UINT64));
mSmmCommunicationAcpiTable.UefiAcpiDataTable.Header.OemRevision = PcdGet32 (PcdAcpiDefaultOemRevision);
mSmmCommunicationAcpiTable.UefiAcpiDataTable.Header.CreatorId = PcdGet32 (PcdAcpiDefaultCreatorId);
mSmmCommunicationAcpiTable.UefiAcpiDataTable.Header.CreatorRevision = PcdGet32 (PcdAcpiDefaultCreatorRevision);
//
// Register software SMI handler
//
Status = gSmst->SmmLocateProtocol (
&gEfiSmmSwDispatch2ProtocolGuid,
NULL,
(VOID **)&SmmSwDispatch2
);
ASSERT_EFI_ERROR (Status);
SmmSwDispatchContext.SwSmiInputValue = (UINTN)-1;
Status = SmmSwDispatch2->Register (
SmmSwDispatch2,
PiSmmCommunicationHandler,
&SmmSwDispatchContext,
&DispatchHandle
);
ASSERT_EFI_ERROR (Status);
DEBUG ((EFI_D_INFO, "SmmCommunication SwSmi: %x\n", (UINTN)SmmSwDispatchContext.SwSmiInputValue));
//
// Set ACPI table
//
Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **) &AcpiTableProtocol);
ASSERT_EFI_ERROR (Status);
mSmmCommunicationAcpiTable.SwSmiNumber = (UINT32)SmmSwDispatchContext.SwSmiInputValue;
BufferPtrAddress = AllocateAcpiNvsMemoryBelow4G (sizeof(EFI_PHYSICAL_ADDRESS));
ASSERT (BufferPtrAddress != NULL);
DEBUG ((EFI_D_INFO, "SmmCommunication BufferPtrAddress: 0x%016lx, BufferPtr: 0x%016lx\n", (EFI_PHYSICAL_ADDRESS)(UINTN)BufferPtrAddress, *BufferPtrAddress));
mSmmCommunicationAcpiTable.BufferPtrAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)BufferPtrAddress;
CopyMem (&mSmmCommunicationAcpiTable.UefiAcpiDataTable.Identifier, &gEfiSmmCommunicationProtocolGuid, sizeof(gEfiSmmCommunicationProtocolGuid));
Status = AcpiTableProtocol->InstallAcpiTable (
AcpiTableProtocol,
&mSmmCommunicationAcpiTable,
sizeof(mSmmCommunicationAcpiTable),
&TableKey
);
ASSERT_EFI_ERROR (Status);
//
// Save context
//
mSmmCommunicationContext.SwSmiNumber = (UINT32)SmmSwDispatchContext.SwSmiInputValue;
mSmmCommunicationContext.BufferPtrAddress = mSmmCommunicationAcpiTable.BufferPtrAddress;
SetCommunicationContext ();
return Status;
}
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