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/** @file
SMM CPU Platform Hook library instance for QEMU.
Copyright (c) 2020, Red Hat, Inc.
Copyright (c) 2006 - 2024, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h> // AsmReadMsr64()
#include <PiSmm.h>
#include <Register/Intel/ArchitecturalMsr.h> // MSR_IA32_APIC_BASE_REGISTER
#include <Library/SmmCpuPlatformHookLib.h>
/**
Checks if platform produces a valid SMI.
This function checks if platform produces a valid SMI. This function is
called at SMM entry to detect if this is a spurious SMI. This function
must be implemented in an MP safe way because it is called by multiple CPU
threads.
@retval TRUE There is a valid SMI
@retval FALSE There is no valid SMI
**/
BOOLEAN
EFIAPI
PlatformValidSmi (
VOID
)
{
return TRUE;
}
/**
Clears platform top level SMI status bit.
This function clears platform top level SMI status bit.
@retval TRUE The platform top level SMI status is cleared.
@retval FALSE The platform top level SMI status cannot be
cleared.
**/
BOOLEAN
EFIAPI
ClearTopLevelSmiStatus (
VOID
)
{
return TRUE;
}
/**
Performs platform specific way of SMM BSP election.
This function performs platform specific way of SMM BSP election.
@param IsBsp Output parameter. TRUE: the CPU this function
executes on is elected to be the SMM BSP. FALSE:
the CPU this function executes on is to be SMM AP.
@retval EFI_SUCCESS The function executes successfully.
@retval EFI_NOT_READY The function does not determine whether this CPU
should be BSP or AP. This may occur if hardware
init sequence to enable the determination is yet to
be done, or the function chooses not to do BSP
election and will let SMM CPU driver to use its
default BSP election process.
@retval EFI_DEVICE_ERROR The function cannot determine whether this CPU
should be BSP or AP due to hardware error.
**/
EFI_STATUS
EFIAPI
PlatformSmmBspElection (
OUT BOOLEAN *IsBsp
)
{
MSR_IA32_APIC_BASE_REGISTER ApicBaseMsr;
ApicBaseMsr.Uint64 = AsmReadMsr64 (MSR_IA32_APIC_BASE);
*IsBsp = (BOOLEAN)(ApicBaseMsr.Bits.BSP == 1);
return EFI_SUCCESS;
}
/**
Get platform page table attribute.
This function gets page table attribute of platform.
@param Address Input parameter. Obtain the page table entries
attribute on this address.
@param PageSize Output parameter. The size of the page.
@param NumOfPages Output parameter. Number of page.
@param PageAttribute Output parameter. Paging Attributes (WB, UC, etc).
@retval EFI_SUCCESS The platform page table attribute from the address
is determined.
@retval EFI_UNSUPPORTED The platform does not support getting page table
attribute for the address.
**/
EFI_STATUS
EFIAPI
GetPlatformPageTableAttribute (
IN UINT64 Address,
IN OUT SMM_PAGE_SIZE_TYPE *PageSize,
IN OUT UINTN *NumOfPages,
IN OUT UINTN *PageAttribute
)
{
return EFI_UNSUPPORTED;
}
/**
SMM CPU Platform Hook before executing MMI Handler.
This function can be used to perform the platform specific items before executing MMI Handler.
@retval EFI_SUCCESS The smm cpu platform hook before executing MMI Handler is executed successfully.
@retval EFI_UNSUPPORTED The smm cpu platform hook before executing MMI Handler is unsupported.
**/
EFI_STATUS
EFIAPI
SmmCpuPlatformHookBeforeMmiHandler (
VOID
)
{
return EFI_UNSUPPORTED;
}
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