mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-01 12:53:27 +01:00
116 lines
3.5 KiB
C
116 lines
3.5 KiB
C
/** @file
|
|
SMM CPU Platform Hook library instance for QEMU.
|
|
|
|
Copyright (c) 2020, Red Hat, Inc.
|
|
Copyright (c) 2006 - 2015, 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;
|
|
}
|