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/** @file
PiSmmCommunication SMM Driver.
Copyright (c) 2010 - 2017, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#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/DebugLib.h>
#include <Library/SmmMemLib.h>
#include <Protocol/SmmSwDispatch2.h>
#include <Protocol/SmmCommunication.h>
#include <Ppi/SmmCommunication.h>
#include "PiSmmCommunicationPrivate.h"
EFI_SMM_COMMUNICATION_CONTEXT mSmmCommunicationContext = {
SMM_COMMUNICATION_SIGNATURE
};
/**
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_SUCCESS
@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_PHYSICAL_ADDRESS *BufferPtrAddress;
//
// 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));
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));
//
// Save context
//
mSmmCommunicationContext.SwSmiNumber = (UINT32)SmmSwDispatchContext.SwSmiInputValue;
mSmmCommunicationContext.BufferPtrAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)BufferPtrAddress;
SetCommunicationContext ();
return Status;
}
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