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/** @file
Implementation shared across all library instances.
Copyright (c) 2010 - 2019, Intel Corporation. All rights reserved.<BR>
Copyright (c) Microsoft Corporation.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiMm.h>
#include <Library/SmmCpuFeaturesLib.h>
#include <Library/BaseLib.h>
#include <Library/MtrrLib.h>
#include <Library/PcdLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DebugLib.h>
#include "CpuFeaturesLib.h"
/**
This function updates the SMRAM save state on the currently executing CPU
to resume execution at a specific address after an RSM instruction. This
function must evaluate the SMRAM save state to determine the execution mode
the RSM instruction resumes and update the resume execution address with
either NewInstructionPointer32 or NewInstructionPoint. The auto HALT restart
flag in the SMRAM save state must always be cleared. This function returns
the value of the instruction pointer from the SMRAM save state that was
replaced. If this function returns 0, then the SMRAM save state was not
modified.
This function is called during the very first SMI on each CPU after
SmmCpuFeaturesInitializeProcessor() to set a flag in normal execution mode
to signal that the SMBASE of each CPU has been updated before the default
SMBASE address is used for the first SMI to the next CPU.
@param[in] CpuIndex The index of the CPU to hook. The value
must be between 0 and the NumberOfCpus
field in the System Management System Table
(SMST).
@param[in] CpuState Pointer to SMRAM Save State Map for the
currently executing CPU.
@param[in] NewInstructionPointer32 Instruction pointer to use if resuming to
32-bit execution mode from 64-bit SMM.
@param[in] NewInstructionPointer Instruction pointer to use if resuming to
same execution mode as SMM.
@retval 0 This function did modify the SMRAM save state.
@retval > 0 The original instruction pointer value from the SMRAM save state
before it was replaced.
**/
UINT64
EFIAPI
SmmCpuFeaturesHookReturnFromSmm (
IN UINTN CpuIndex,
IN SMRAM_SAVE_STATE_MAP *CpuState,
IN UINT64 NewInstructionPointer32,
IN UINT64 NewInstructionPointer
)
{
return 0;
}
/**
Hook point in normal execution mode that allows the one CPU that was elected
as monarch during System Management Mode initialization to perform additional
initialization actions immediately after all of the CPUs have processed their
first SMI and called SmmCpuFeaturesInitializeProcessor() relocating SMBASE
into a buffer in SMRAM and called SmmCpuFeaturesHookReturnFromSmm().
**/
VOID
EFIAPI
SmmCpuFeaturesSmmRelocationComplete (
VOID
)
{
}
/**
Processor specific hook point each time a CPU exits System Management Mode.
@param[in] CpuIndex The index of the CPU that is exiting SMM. The value must
be between 0 and the NumberOfCpus field in the System
Management System Table (SMST).
**/
VOID
EFIAPI
SmmCpuFeaturesRendezvousExit (
IN UINTN CpuIndex
)
{
}
/**
Check to see if an SMM register is supported by a specified CPU.
@param[in] CpuIndex The index of the CPU to check for SMM register support.
The value must be between 0 and the NumberOfCpus field
in the System Management System Table (SMST).
@param[in] RegName Identifies the SMM register to check for support.
@retval TRUE The SMM register specified by RegName is supported by the CPU
specified by CpuIndex.
@retval FALSE The SMM register specified by RegName is not supported by the
CPU specified by CpuIndex.
**/
BOOLEAN
EFIAPI
SmmCpuFeaturesIsSmmRegisterSupported (
IN UINTN CpuIndex,
IN SMM_REG_NAME RegName
)
{
if (FeaturePcdGet (PcdSmmFeatureControlEnable) && (RegName == SmmRegFeatureControl)) {
return TRUE;
}
return FALSE;
}
/**
Read an SMM Save State register on the target processor. If this function
returns EFI_UNSUPPORTED, then the caller is responsible for reading the
SMM Save Sate register.
@param[in] CpuIndex The index of the CPU to read the SMM Save State. The
value must be between 0 and the NumberOfCpus field in
the System Management System Table (SMST).
@param[in] Register The SMM Save State register to read.
@param[in] Width The number of bytes to read from the CPU save state.
@param[out] Buffer Upon return, this holds the CPU register value read
from the save state.
@retval EFI_SUCCESS The register was read from Save State.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_UNSUPPORTED This function does not support reading Register.
**/
EFI_STATUS
EFIAPI
SmmCpuFeaturesReadSaveStateRegister (
IN UINTN CpuIndex,
IN EFI_SMM_SAVE_STATE_REGISTER Register,
IN UINTN Width,
OUT VOID *Buffer
)
{
return EFI_UNSUPPORTED;
}
/**
Writes an SMM Save State register on the target processor. If this function
returns EFI_UNSUPPORTED, then the caller is responsible for writing the
SMM Save Sate register.
@param[in] CpuIndex The index of the CPU to write the SMM Save State. The
value must be between 0 and the NumberOfCpus field in
the System Management System Table (SMST).
@param[in] Register The SMM Save State register to write.
@param[in] Width The number of bytes to write to the CPU save state.
@param[in] Buffer Upon entry, this holds the new CPU register value.
@retval EFI_SUCCESS The register was written to Save State.
@retval EFI_INVALID_PARAMETER Buffer is NULL.
@retval EFI_UNSUPPORTED This function does not support writing Register.
**/
EFI_STATUS
EFIAPI
SmmCpuFeaturesWriteSaveStateRegister (
IN UINTN CpuIndex,
IN EFI_SMM_SAVE_STATE_REGISTER Register,
IN UINTN Width,
IN CONST VOID *Buffer
)
{
return EFI_UNSUPPORTED;
}
/**
This function is hook point called after the gEfiSmmReadyToLockProtocolGuid
notification is completely processed.
**/
VOID
EFIAPI
SmmCpuFeaturesCompleteSmmReadyToLock (
VOID
)
{
}
/**
This API provides a method for a CPU to allocate a specific region for storing page tables.
This API can be called more once to allocate memory for page tables.
Allocates the number of 4KB pages of type EfiRuntimeServicesData and returns a pointer to the
allocated buffer. The buffer returned is aligned on a 4KB boundary. If Pages is 0, then NULL
is returned. If there is not enough memory remaining to satisfy the request, then NULL is
returned.
This function can also return NULL if there is no preference on where the page tables are allocated in SMRAM.
@param Pages The number of 4 KB pages to allocate.
@return A pointer to the allocated buffer for page tables.
@retval NULL Fail to allocate a specific region for storing page tables,
Or there is no preference on where the page tables are allocated in SMRAM.
**/
VOID *
EFIAPI
SmmCpuFeaturesAllocatePageTableMemory (
IN UINTN Pages
)
{
return NULL;
}
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