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system76-edk2/UefiCpuPkg/Library/MpInitLib/MpLib.h
Tom Lendacky 7b7508ad78 UefiCpuPkg: Allow AP booting under SEV-ES 
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

Typically, an AP is booted using the INIT-SIPI-SIPI sequence. This
sequence is intercepted by the hypervisor, which sets the AP's registers
to the values requested by the sequence. At that point, the hypervisor can
start the AP, which will then begin execution at the appropriate location.

Under SEV-ES, AP booting presents some challenges since the hypervisor is
not allowed to alter the AP's register state. In this situation, we have
to distinguish between the AP's first boot and AP's subsequent boots.

First boot:
 Once the AP's register state has been defined (which is before the guest
 is first booted) it cannot be altered. Should the hypervisor attempt to
 alter the register state, the change would be detected by the hardware
 and the VMRUN instruction would fail. Given this, the first boot for the
 AP is required to begin execution with this initial register state, which
 is typically the reset vector. This prevents the BSP from directing the
 AP startup location through the INIT-SIPI-SIPI sequence.

 To work around this, the firmware will provide a build time reserved area
 that can be used as the initial IP value. The hypervisor can extract this
 location value by checking for the SEV-ES reset block GUID that must be
 located 48-bytes from the end of the firmware. The format of the SEV-ES
 reset block area is:

   0x00 - 0x01 - SEV-ES Reset IP
   0x02 - 0x03 - SEV-ES Reset CS Segment Base[31:16]
   0x04 - 0x05 - Size of the SEV-ES reset block
   0x06 - 0x15 - SEV-ES Reset Block GUID
                   (00f771de-1a7e-4fcb-890e-68c77e2fb44e)

   The total size is 22 bytes. Any expansion to this block must be done
   by adding new values before existing values.

 The hypervisor will use the IP and CS values obtained from the SEV-ES
 reset block to set as the AP's initial values. The CS Segment Base
 represents the upper 16 bits of the CS segment base and must be left
 shifted by 16 bits to form the complete CS segment base value.

 Before booting the AP for the first time, the BSP must initialize the
 SEV-ES reset area. This consists of programming a FAR JMP instruction
 to the contents of a memory location that is also located in the SEV-ES
 reset area. The BSP must program the IP and CS values for the FAR JMP
 based on values drived from the INIT-SIPI-SIPI sequence.

Subsequent boots:
 Again, the hypervisor cannot alter the AP register state, so a method is
 required to take the AP out of halt state and redirect it to the desired
 IP location. If it is determined that the AP is running in an SEV-ES
 guest, then instead of calling CpuSleep(), a VMGEXIT is issued with the
 AP Reset Hold exit code (0x80000004). The hypervisor will put the AP in
 a halt state, waiting for an INIT-SIPI-SIPI sequence. Once the sequence
 is recognized, the hypervisor will resume the AP. At this point the AP
 must transition from the current 64-bit long mode down to 16-bit real
 mode and begin executing at the derived location from the INIT-SIPI-SIPI
 sequence.

 Another change is around the area of obtaining the (x2)APIC ID during AP
 startup. During AP startup, the AP can't take a #VC exception before the
 AP has established a stack. However, the AP stack is set by using the
 (x2)APIC ID, which is obtained through CPUID instructions. A CPUID
 instruction will cause a #VC, so a different method must be used. The
 GHCB protocol supports a method to obtain CPUID information from the
 hypervisor through the GHCB MSR. This method does not require a stack,
 so it is used to obtain the necessary CPUID information to determine the
 (x2)APIC ID.

The new 16-bit protected mode GDT entry is used in order to transition
from 64-bit long mode down to 16-bit real mode.

A new assembler routine is created that takes the AP from 64-bit long mode
to 16-bit real mode.  This is located under 1MB in memory and transitions
from 64-bit long mode to 32-bit compatibility mode to 16-bit protected
mode and finally 16-bit real mode.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
2020-08-17 02:46:39 +00:00

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/** @file
Common header file for MP Initialize Library.
Copyright (c) 2016 - 2020, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2020, AMD Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _MP_LIB_H_
#define _MP_LIB_H_
#include <PiPei.h>
#include <Register/Intel/Cpuid.h>
#include <Register/Amd/Cpuid.h>
#include <Register/Intel/Msr.h>
#include <Register/Intel/LocalApic.h>
#include <Register/Intel/Microcode.h>
#include <Library/MpInitLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DebugLib.h>
#include <Library/LocalApicLib.h>
#include <Library/CpuLib.h>
#include <Library/UefiCpuLib.h>
#include <Library/TimerLib.h>
#include <Library/SynchronizationLib.h>
#include <Library/MtrrLib.h>
#include <Library/HobLib.h>
#include <Library/PcdLib.h>
#include <Guid/MicrocodePatchHob.h>
#define WAKEUP_AP_SIGNAL SIGNATURE_32 ('S', 'T', 'A', 'P')
#define CPU_INIT_MP_LIB_HOB_GUID \
{ \
0x58eb6a19, 0x3699, 0x4c68, { 0xa8, 0x36, 0xda, 0xcd, 0x8e, 0xdc, 0xad, 0x4a } \
}
//
// The MP data for switch BSP
//
#define CPU_SWITCH_STATE_IDLE 0
#define CPU_SWITCH_STATE_STORED 1
#define CPU_SWITCH_STATE_LOADED 2
//
// Default maximum number of entries to store the microcode patches information
//
#define DEFAULT_MAX_MICROCODE_PATCH_NUM 8
//
// Data structure for microcode patch information
//
typedef struct {
UINTN Address;
UINTN Size;
} MICROCODE_PATCH_INFO;
//
// CPU exchange information for switch BSP
//
typedef struct {
UINT8 State; // offset 0
UINTN StackPointer; // offset 4 / 8
IA32_DESCRIPTOR Gdtr; // offset 8 / 16
IA32_DESCRIPTOR Idtr; // offset 14 / 26
} CPU_EXCHANGE_ROLE_INFO;
//
// AP loop state when APs are in idle state
// It's value is the same with PcdCpuApLoopMode
//
typedef enum {
ApInHltLoop = 1,
ApInMwaitLoop = 2,
ApInRunLoop = 3
} AP_LOOP_MODE;
//
// AP initialization state during APs wakeup
//
typedef enum {
ApInitConfig = 1,
ApInitReconfig = 2,
ApInitDone = 3
} AP_INIT_STATE;
//
// AP state
//
// The state transitions for an AP when it process a procedure are:
// Idle ----> Ready ----> Busy ----> Idle
// [BSP] [AP] [AP]
//
typedef enum {
CpuStateIdle,
CpuStateReady,
CpuStateBusy,
CpuStateFinished,
CpuStateDisabled
} CPU_STATE;
//
// CPU volatile registers around INIT-SIPI-SIPI
//
typedef struct {
UINTN Cr0;
UINTN Cr3;
UINTN Cr4;
UINTN Dr0;
UINTN Dr1;
UINTN Dr2;
UINTN Dr3;
UINTN Dr6;
UINTN Dr7;
IA32_DESCRIPTOR Gdtr;
IA32_DESCRIPTOR Idtr;
UINT16 Tr;
} CPU_VOLATILE_REGISTERS;
//
// AP related data
//
typedef struct {
SPIN_LOCK ApLock;
volatile UINT32 *StartupApSignal;
volatile UINTN ApFunction;
volatile UINTN ApFunctionArgument;
BOOLEAN CpuHealthy;
volatile CPU_STATE State;
CPU_VOLATILE_REGISTERS VolatileRegisters;
BOOLEAN Waiting;
BOOLEAN *Finished;
UINT64 ExpectedTime;
UINT64 CurrentTime;
UINT64 TotalTime;
EFI_EVENT WaitEvent;
UINT32 ProcessorSignature;
UINT8 PlatformId;
UINT64 MicrocodeEntryAddr;
} CPU_AP_DATA;
//
// Basic CPU information saved in Guided HOB.
// Because the contents will be shard between PEI and DXE,
// we need to make sure the each fields offset same in different
// architecture.
//
#pragma pack (1)
typedef struct {
UINT32 InitialApicId;
UINT32 ApicId;
UINT32 Health;
UINT64 ApTopOfStack;
} CPU_INFO_IN_HOB;
#pragma pack ()
//
// AP reset code information including code address and size,
// this structure will be shared be C code and assembly code.
// It is natural aligned by design.
//
typedef struct {
UINT8 *RendezvousFunnelAddress;
UINTN ModeEntryOffset;
UINTN RendezvousFunnelSize;
UINT8 *RelocateApLoopFuncAddress;
UINTN RelocateApLoopFuncSize;
UINTN ModeTransitionOffset;
UINTN SwitchToRealSize;
UINTN SwitchToRealOffset;
UINTN SwitchToRealNoNxOffset;
UINTN SwitchToRealPM16ModeOffset;
UINTN SwitchToRealPM16ModeSize;
} MP_ASSEMBLY_ADDRESS_MAP;
typedef struct _CPU_MP_DATA CPU_MP_DATA;
#pragma pack(1)
//
// MP CPU exchange information for AP reset code
// This structure is required to be packed because fixed field offsets
// into this structure are used in assembly code in this module
//
typedef struct {
UINTN Lock;
UINTN StackStart;
UINTN StackSize;
UINTN CFunction;
IA32_DESCRIPTOR GdtrProfile;
IA32_DESCRIPTOR IdtrProfile;
UINTN BufferStart;
UINTN ModeOffset;
UINTN ApIndex;
UINTN CodeSegment;
UINTN DataSegment;
UINTN EnableExecuteDisable;
UINTN Cr3;
UINTN InitFlag;
CPU_INFO_IN_HOB *CpuInfo;
UINTN NumApsExecuting;
CPU_MP_DATA *CpuMpData;
UINTN InitializeFloatingPointUnitsAddress;
UINT32 ModeTransitionMemory;
UINT16 ModeTransitionSegment;
UINT32 ModeHighMemory;
UINT16 ModeHighSegment;
//
// Enable5LevelPaging indicates whether 5-level paging is enabled in long mode.
//
BOOLEAN Enable5LevelPaging;
BOOLEAN SevEsIsEnabled;
UINTN GhcbBase;
} MP_CPU_EXCHANGE_INFO;
#pragma pack()
//
// CPU MP Data save in memory
//
struct _CPU_MP_DATA {
UINT64 CpuInfoInHob;
UINT32 CpuCount;
UINT32 BspNumber;
//
// The above fields data will be passed from PEI to DXE
// Please make sure the fields offset same in the different
// architecture.
//
SPIN_LOCK MpLock;
UINTN Buffer;
UINTN CpuApStackSize;
MP_ASSEMBLY_ADDRESS_MAP AddressMap;
UINTN WakeupBuffer;
UINTN WakeupBufferHigh;
UINTN BackupBuffer;
UINTN BackupBufferSize;
volatile UINT32 FinishedCount;
UINT32 RunningCount;
BOOLEAN SingleThread;
EFI_AP_PROCEDURE Procedure;
VOID *ProcArguments;
BOOLEAN *Finished;
UINT64 ExpectedTime;
UINT64 CurrentTime;
UINT64 TotalTime;
EFI_EVENT WaitEvent;
UINTN **FailedCpuList;
AP_INIT_STATE InitFlag;
BOOLEAN SwitchBspFlag;
UINTN NewBspNumber;
CPU_EXCHANGE_ROLE_INFO BSPInfo;
CPU_EXCHANGE_ROLE_INFO APInfo;
MTRR_SETTINGS MtrrTable;
UINT8 ApLoopMode;
UINT8 ApTargetCState;
UINT16 PmCodeSegment;
UINT16 Pm16CodeSegment;
CPU_AP_DATA *CpuData;
volatile MP_CPU_EXCHANGE_INFO *MpCpuExchangeInfo;
UINT32 CurrentTimerCount;
UINTN DivideValue;
UINT8 Vector;
BOOLEAN PeriodicMode;
BOOLEAN TimerInterruptState;
UINT64 MicrocodePatchAddress;
UINT64 MicrocodePatchRegionSize;
//
// Whether need to use Init-Sipi-Sipi to wake up the APs.
// Two cases need to set this value to TRUE. One is in HLT
// loop mode, the other is resume from S3 which loop mode
// will be hardcode change to HLT mode by PiSmmCpuDxeSmm
// driver.
//
BOOLEAN WakeUpByInitSipiSipi;
BOOLEAN SevEsIsEnabled;
UINTN SevEsAPBuffer;
UINTN SevEsAPResetStackStart;
CPU_MP_DATA *NewCpuMpData;
UINT64 GhcbBase;
};
#define AP_RESET_STACK_SIZE 64
#pragma pack(1)
typedef struct {
UINT8 InsnBuffer[8];
UINT16 Rip;
UINT16 Segment;
} SEV_ES_AP_JMP_FAR;
#pragma pack()
/**
Assembly code to move an AP from long mode to real mode.
Move an AP from long mode to real mode in preparation to invoking
the reset vector. This is used for SEV-ES guests where a hypervisor
is not allowed to set the CS and RIP to point to the reset vector.
@param[in] BufferStart The reset vector target.
@param[in] Code16 16-bit protected mode code segment value.
@param[in] Code32 32-bit protected mode code segment value.
@param[in] StackStart The start of a stack to be used for transitioning
from long mode to real mode.
**/
typedef
VOID
(EFIAPI AP_RESET) (
IN UINTN BufferStart,
IN UINT16 Code16,
IN UINT16 Code32,
IN UINTN StackStart
);
extern EFI_GUID mCpuInitMpLibHobGuid;
/**
Assembly code to place AP into safe loop mode.
Place AP into targeted C-State if MONITOR is supported, otherwise
place AP into hlt state.
Place AP in protected mode if the current is long mode. Due to AP maybe
wakeup by some hardware event. It could avoid accessing page table that
may not available during booting to OS.
@param[in] MwaitSupport TRUE indicates MONITOR is supported.
FALSE indicates MONITOR is not supported.
@param[in] ApTargetCState Target C-State value.
@param[in] PmCodeSegment Protected mode code segment value.
**/
typedef
VOID
(EFIAPI * ASM_RELOCATE_AP_LOOP) (
IN BOOLEAN MwaitSupport,
IN UINTN ApTargetCState,
IN UINTN PmCodeSegment,
IN UINTN TopOfApStack,
IN UINTN NumberToFinish
);
/**
Assembly code to get starting address and size of the rendezvous entry for APs.
Information for fixing a jump instruction in the code is also returned.
@param[out] AddressMap Output buffer for address map information.
**/
VOID
EFIAPI
AsmGetAddressMap (
OUT MP_ASSEMBLY_ADDRESS_MAP *AddressMap
);
/**
This function is called by both the BSP and the AP which is to become the BSP to
Exchange execution context including stack between them. After return from this
function, the BSP becomes AP and the AP becomes the BSP.
@param[in] MyInfo Pointer to buffer holding the exchanging information for the executing processor.
@param[in] OthersInfo Pointer to buffer holding the exchanging information for the peer.
**/
VOID
EFIAPI
AsmExchangeRole (
IN CPU_EXCHANGE_ROLE_INFO *MyInfo,
IN CPU_EXCHANGE_ROLE_INFO *OthersInfo
);
/**
Get the pointer to CPU MP Data structure.
@return The pointer to CPU MP Data structure.
**/
CPU_MP_DATA *
GetCpuMpData (
VOID
);
/**
Save the pointer to CPU MP Data structure.
@param[in] CpuMpData The pointer to CPU MP Data structure will be saved.
**/
VOID
SaveCpuMpData (
IN CPU_MP_DATA *CpuMpData
);
/**
Get available system memory below 1MB by specified size.
@param[in] WakeupBufferSize Wakeup buffer size required
@retval other Return wakeup buffer address below 1MB.
@retval -1 Cannot find free memory below 1MB.
**/
UINTN
GetWakeupBuffer (
IN UINTN WakeupBufferSize
);
/**
Get available EfiBootServicesCode memory below 4GB by specified size.
This buffer is required to safely transfer AP from real address mode to
protected mode or long mode, due to the fact that the buffer returned by
GetWakeupBuffer() may be marked as non-executable.
@param[in] BufferSize Wakeup transition buffer size.
@retval other Return wakeup transition buffer address below 4GB.
@retval 0 Cannot find free memory below 4GB.
**/
UINTN
GetModeTransitionBuffer (
IN UINTN BufferSize
);
/**
Return the address of the SEV-ES AP jump table.
This buffer is required in order for an SEV-ES guest to transition from
UEFI into an OS.
@return Return SEV-ES AP jump table buffer
**/
UINTN
GetSevEsAPMemory (
VOID
);
/**
This function will be called by BSP to wakeup AP.
@param[in] CpuMpData Pointer to CPU MP Data
@param[in] Broadcast TRUE: Send broadcast IPI to all APs
FALSE: Send IPI to AP by ApicId
@param[in] ProcessorNumber The handle number of specified processor
@param[in] Procedure The function to be invoked by AP
@param[in] ProcedureArgument The argument to be passed into AP function
@param[in] WakeUpDisabledAps Whether need to wake up disabled APs in broadcast mode.
**/
VOID
WakeUpAP (
IN CPU_MP_DATA *CpuMpData,
IN BOOLEAN Broadcast,
IN UINTN ProcessorNumber,
IN EFI_AP_PROCEDURE Procedure, OPTIONAL
IN VOID *ProcedureArgument, OPTIONAL
IN BOOLEAN WakeUpDisabledAps OPTIONAL
);
/**
Initialize global data for MP support.
@param[in] CpuMpData The pointer to CPU MP Data structure.
**/
VOID
InitMpGlobalData (
IN CPU_MP_DATA *CpuMpData
);
/**
Worker function to execute a caller provided function on all enabled APs.
@param[in] Procedure A pointer to the function to be run on
enabled APs of the system.
@param[in] SingleThread If TRUE, then all the enabled APs execute
the function specified by Procedure one by
one, in ascending order of processor handle
number. If FALSE, then all the enabled APs
execute the function specified by Procedure
simultaneously.
@param[in] ExcludeBsp Whether let BSP also trig this task.
@param[in] WaitEvent The event created by the caller with CreateEvent()
service.
@param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for
APs to return from Procedure, either for
blocking or non-blocking mode.
@param[in] ProcedureArgument The parameter passed into Procedure for
all APs.
@param[out] FailedCpuList If all APs finish successfully, then its
content is set to NULL. If not all APs
finish before timeout expires, then its
content is set to address of the buffer
holding handle numbers of the failed APs.
@retval EFI_SUCCESS In blocking mode, all APs have finished before
the timeout expired.
@retval EFI_SUCCESS In non-blocking mode, function has been dispatched
to all enabled APs.
@retval others Failed to Startup all APs.
**/
EFI_STATUS
StartupAllCPUsWorker (
IN EFI_AP_PROCEDURE Procedure,
IN BOOLEAN SingleThread,
IN BOOLEAN ExcludeBsp,
IN EFI_EVENT WaitEvent OPTIONAL,
IN UINTN TimeoutInMicroseconds,
IN VOID *ProcedureArgument OPTIONAL,
OUT UINTN **FailedCpuList OPTIONAL
);
/**
Worker function to let the caller get one enabled AP to execute a caller-provided
function.
@param[in] Procedure A pointer to the function to be run on
enabled APs of the system.
@param[in] ProcessorNumber The handle number of the AP.
@param[in] WaitEvent The event created by the caller with CreateEvent()
service.
@param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for
APs to return from Procedure, either for
blocking or non-blocking mode.
@param[in] ProcedureArgument The parameter passed into Procedure for
all APs.
@param[out] Finished If AP returns from Procedure before the
timeout expires, its content is set to TRUE.
Otherwise, the value is set to FALSE.
@retval EFI_SUCCESS In blocking mode, specified AP finished before
the timeout expires.
@retval others Failed to Startup AP.
**/
EFI_STATUS
StartupThisAPWorker (
IN EFI_AP_PROCEDURE Procedure,
IN UINTN ProcessorNumber,
IN EFI_EVENT WaitEvent OPTIONAL,
IN UINTN TimeoutInMicroseconds,
IN VOID *ProcedureArgument OPTIONAL,
OUT BOOLEAN *Finished OPTIONAL
);
/**
Worker function to switch the requested AP to be the BSP from that point onward.
@param[in] ProcessorNumber The handle number of AP that is to become the new BSP.
@param[in] EnableOldBSP If TRUE, then the old BSP will be listed as an
enabled AP. Otherwise, it will be disabled.
@retval EFI_SUCCESS BSP successfully switched.
@retval others Failed to switch BSP.
**/
EFI_STATUS
SwitchBSPWorker (
IN UINTN ProcessorNumber,
IN BOOLEAN EnableOldBSP
);
/**
Worker function to let the caller enable or disable an AP from this point onward.
This service may only be called from the BSP.
@param[in] ProcessorNumber The handle number of AP.
@param[in] EnableAP Specifies the new state for the processor for
enabled, FALSE for disabled.
@param[in] HealthFlag If not NULL, a pointer to a value that specifies
the new health status of the AP.
@retval EFI_SUCCESS The specified AP was enabled or disabled successfully.
@retval others Failed to Enable/Disable AP.
**/
EFI_STATUS
EnableDisableApWorker (
IN UINTN ProcessorNumber,
IN BOOLEAN EnableAP,
IN UINT32 *HealthFlag OPTIONAL
);
/**
Get pointer to CPU MP Data structure from GUIDed HOB.
@return The pointer to CPU MP Data structure.
**/
CPU_MP_DATA *
GetCpuMpDataFromGuidedHob (
VOID
);
/** Checks status of specified AP.
This function checks whether the specified AP has finished the task assigned
by StartupThisAP(), and whether timeout expires.
@param[in] ProcessorNumber The handle number of processor.
@retval EFI_SUCCESS Specified AP has finished task assigned by StartupThisAPs().
@retval EFI_TIMEOUT The timeout expires.
@retval EFI_NOT_READY Specified AP has not finished task and timeout has not expired.
**/
EFI_STATUS
CheckThisAP (
IN UINTN ProcessorNumber
);
/**
Checks status of all APs.
This function checks whether all APs have finished task assigned by StartupAllAPs(),
and whether timeout expires.
@retval EFI_SUCCESS All APs have finished task assigned by StartupAllAPs().
@retval EFI_TIMEOUT The timeout expires.
@retval EFI_NOT_READY APs have not finished task and timeout has not expired.
**/
EFI_STATUS
CheckAllAPs (
VOID
);
/**
Checks APs status and updates APs status if needed.
**/
VOID
CheckAndUpdateApsStatus (
VOID
);
/**
Detect whether specified processor can find matching microcode patch and load it.
@param[in] CpuMpData The pointer to CPU MP Data structure.
@param[in] ProcessorNumber The handle number of the processor. The range is
from 0 to the total number of logical processors
minus 1.
**/
VOID
MicrocodeDetect (
IN CPU_MP_DATA *CpuMpData,
IN UINTN ProcessorNumber
);
/**
Shadow the required microcode patches data into memory.
@param[in, out] CpuMpData The pointer to CPU MP Data structure.
**/
VOID
ShadowMicrocodeUpdatePatch (
IN OUT CPU_MP_DATA *CpuMpData
);
/**
Get the cached microcode patch base address and size from the microcode patch
information cache HOB.
@param[out] Address Base address of the microcode patches data.
It will be updated if the microcode patch
information cache HOB is found.
@param[out] RegionSize Size of the microcode patches data.
It will be updated if the microcode patch
information cache HOB is found.
@retval TRUE The microcode patch information cache HOB is found.
@retval FALSE The microcode patch information cache HOB is not found.
**/
BOOLEAN
GetMicrocodePatchInfoFromHob (
UINT64 *Address,
UINT64 *RegionSize
);
/**
Detect whether Mwait-monitor feature is supported.
@retval TRUE Mwait-monitor feature is supported.
@retval FALSE Mwait-monitor feature is not supported.
**/
BOOLEAN
IsMwaitSupport (
VOID
);
/**
Enable Debug Agent to support source debugging on AP function.
**/
VOID
EnableDebugAgent (
VOID
);
/**
Find the current Processor number by APIC ID.
@param[in] CpuMpData Pointer to PEI CPU MP Data
@param[out] ProcessorNumber Return the pocessor number found
@retval EFI_SUCCESS ProcessorNumber is found and returned.
@retval EFI_NOT_FOUND ProcessorNumber is not found.
**/
EFI_STATUS
GetProcessorNumber (
IN CPU_MP_DATA *CpuMpData,
OUT UINTN *ProcessorNumber
);
/**
This funtion will try to invoke platform specific microcode shadow logic to
relocate microcode update patches into memory.
@param[in, out] CpuMpData The pointer to CPU MP Data structure.
@retval EFI_SUCCESS Shadow microcode success.
@retval EFI_OUT_OF_RESOURCES No enough resource to complete the operation.
@retval EFI_UNSUPPORTED Can't find platform specific microcode shadow
PPI/Protocol.
**/
EFI_STATUS
PlatformShadowMicrocode (
IN OUT CPU_MP_DATA *CpuMpData
);
#endif
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