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audk/UefiCpuPkg/CpuMpPei/PeiMpServices.c

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/** @file
Implementation of Multiple Processor PPI services.
Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "PeiMpServices.h"
//
// CPU MP PPI to be installed
//
EFI_PEI_MP_SERVICES_PPI mMpServicesPpi = {
PeiGetNumberOfProcessors,
PeiGetProcessorInfo,
PeiStartupAllAPs,
PeiStartupThisAP,
PeiSwitchBSP,
PeiEnableDisableAP,
PeiWhoAmI,
};
EFI_PEI_PPI_DESCRIPTOR mPeiCpuMpPpiDesc = {
(EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
&gEfiPeiMpServicesPpiGuid,
&mMpServicesPpi
};
/**
Get CPU Package/Core/Thread location information.
@param InitialApicId CPU APIC ID
@param Location Pointer to CPU location information
**/
VOID
ExtractProcessorLocation (
IN UINT32 InitialApicId,
OUT EFI_CPU_PHYSICAL_LOCATION *Location
)
{
BOOLEAN TopologyLeafSupported;
UINTN ThreadBits;
UINTN CoreBits;
UINT32 RegEax;
UINT32 RegEbx;
UINT32 RegEcx;
UINT32 RegEdx;
UINT32 MaxCpuIdIndex;
UINT32 SubIndex;
UINTN LevelType;
UINT32 MaxLogicProcessorsPerPackage;
UINT32 MaxCoresPerPackage;
//
// Check if the processor is capable of supporting more than one logical processor.
//
AsmCpuid (CPUID_VERSION_INFO, NULL, NULL, NULL, &RegEdx);
if ((RegEdx & BIT28) == 0) {
Location->Thread = 0;
Location->Core = 0;
Location->Package = 0;
return;
}
ThreadBits = 0;
CoreBits = 0;
//
// Assume three-level mapping of APIC ID: Package:Core:SMT.
//
TopologyLeafSupported = FALSE;
//
// Get the max index of basic CPUID
//
AsmCpuid (CPUID_SIGNATURE, &MaxCpuIdIndex, NULL, NULL, NULL);
//
// If the extended topology enumeration leaf is available, it
// is the preferred mechanism for enumerating topology.
//
if (MaxCpuIdIndex >= CPUID_EXTENDED_TOPOLOGY) {
AsmCpuidEx (CPUID_EXTENDED_TOPOLOGY, 0, &RegEax, &RegEbx, &RegEcx, NULL);
//
// If CPUID.(EAX=0BH, ECX=0H):EBX returns zero and maximum input value for
// basic CPUID information is greater than 0BH, then CPUID.0BH leaf is not
// supported on that processor.
//
if (RegEbx != 0) {
TopologyLeafSupported = TRUE;
//
// Sub-leaf index 0 (ECX= 0 as input) provides enumeration parameters to extract
// the SMT sub-field of x2APIC ID.
//
LevelType = (RegEcx >> 8) & 0xff;
ASSERT (LevelType == CPUID_EXTENDED_TOPOLOGY_LEVEL_TYPE_SMT);
ThreadBits = RegEax & 0x1f;
//
// Software must not assume any "level type" encoding
// value to be related to any sub-leaf index, except sub-leaf 0.
//
SubIndex = 1;
do {
AsmCpuidEx (CPUID_EXTENDED_TOPOLOGY, SubIndex, &RegEax, NULL, &RegEcx, NULL);
LevelType = (RegEcx >> 8) & 0xff;
if (LevelType == CPUID_EXTENDED_TOPOLOGY_LEVEL_TYPE_CORE) {
CoreBits = (RegEax & 0x1f) - ThreadBits;
break;
}
SubIndex++;
} while (LevelType != CPUID_EXTENDED_TOPOLOGY_LEVEL_TYPE_INVALID);
}
}
if (!TopologyLeafSupported) {
AsmCpuid (CPUID_VERSION_INFO, NULL, &RegEbx, NULL, NULL);
MaxLogicProcessorsPerPackage = (RegEbx >> 16) & 0xff;
if (MaxCpuIdIndex >= CPUID_CACHE_PARAMS) {
AsmCpuidEx (CPUID_CACHE_PARAMS, 0, &RegEax, NULL, NULL, NULL);
MaxCoresPerPackage = (RegEax >> 26) + 1;
} else {
//
// Must be a single-core processor.
//
MaxCoresPerPackage = 1;
}
ThreadBits = (UINTN) (HighBitSet32 (MaxLogicProcessorsPerPackage / MaxCoresPerPackage - 1) + 1);
CoreBits = (UINTN) (HighBitSet32 (MaxCoresPerPackage - 1) + 1);
}
Location->Thread = InitialApicId & ~((-1) << ThreadBits);
Location->Core = (InitialApicId >> ThreadBits) & ~((-1) << CoreBits);
Location->Package = (InitialApicId >> (ThreadBits + CoreBits));
}
/**
Find the current Processor number by APIC ID.
@param PeiCpuMpData Pointer to PEI CPU MP Data
@param 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 PEI_CPU_MP_DATA *PeiCpuMpData,
OUT UINTN *ProcessorNumber
)
{
UINTN TotalProcessorNumber;
UINTN Index;
TotalProcessorNumber = PeiCpuMpData->CpuCount;
for (Index = 0; Index < TotalProcessorNumber; Index ++) {
if (PeiCpuMpData->CpuData[Index].ApicId == GetInitialApicId ()) {
*ProcessorNumber = Index;
return EFI_SUCCESS;
}
}
return EFI_NOT_FOUND;
}
/**
Worker function for SwitchBSP().
Worker function for SwitchBSP(), assigned to the AP which is intended to become BSP.
@param Buffer Pointer to CPU MP Data
**/
VOID
EFIAPI
FutureBSPProc (
IN VOID *Buffer
)
{
PEI_CPU_MP_DATA *DataInHob;
DataInHob = (PEI_CPU_MP_DATA *) Buffer;
AsmExchangeRole (&DataInHob->APInfo, &DataInHob->BSPInfo);
}
/**
This service retrieves the number of logical processor in the platform
and the number of those logical processors that are enabled on this boot.
This service may only be called from the BSP.
This function is used to retrieve the following information:
- The number of logical processors that are present in the system.
- The number of enabled logical processors in the system at the instant
this call is made.
Because MP Service Ppi provides services to enable and disable processors
dynamically, the number of enabled logical processors may vary during the
course of a boot session.
If this service is called from an AP, then EFI_DEVICE_ERROR is returned.
If NumberOfProcessors or NumberOfEnabledProcessors is NULL, then
EFI_INVALID_PARAMETER is returned. Otherwise, the total number of processors
is returned in NumberOfProcessors, the number of currently enabled processor
is returned in NumberOfEnabledProcessors, and EFI_SUCCESS is returned.
@param[in] PeiServices An indirect pointer to the PEI Services Table
published by the PEI Foundation.
@param[in] This Pointer to this instance of the PPI.
@param[out] NumberOfProcessors Pointer to the total number of logical processors in
the system, including the BSP and disabled APs.
@param[out] NumberOfEnabledProcessors
Number of processors in the system that are enabled.
@retval EFI_SUCCESS The number of logical processors and enabled
logical processors was retrieved.
@retval EFI_DEVICE_ERROR The calling processor is an AP.
@retval EFI_INVALID_PARAMETER NumberOfProcessors is NULL.
NumberOfEnabledProcessors is NULL.
**/
EFI_STATUS
EFIAPI
PeiGetNumberOfProcessors (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_MP_SERVICES_PPI *This,
OUT UINTN *NumberOfProcessors,
OUT UINTN *NumberOfEnabledProcessors
)
{
PEI_CPU_MP_DATA *PeiCpuMpData;
UINTN CallerNumber;
UINTN ProcessorNumber;
UINTN EnabledProcessorNumber;
UINTN Index;
PeiCpuMpData = GetMpHobData ();
if (PeiCpuMpData == NULL) {
return EFI_NOT_FOUND;
}
if ((NumberOfProcessors == NULL) || (NumberOfEnabledProcessors == NULL)) {
return EFI_INVALID_PARAMETER;
}
//
// Check whether caller processor is BSP
//
PeiWhoAmI (PeiServices, This, &CallerNumber);
if (CallerNumber != PeiCpuMpData->BspNumber) {
return EFI_DEVICE_ERROR;
}
ProcessorNumber = PeiCpuMpData->CpuCount;
EnabledProcessorNumber = 0;
for (Index = 0; Index < ProcessorNumber; Index++) {
if (PeiCpuMpData->CpuData[Index].State != CpuStateDisabled) {
EnabledProcessorNumber ++;
}
}
*NumberOfProcessors = ProcessorNumber;
*NumberOfEnabledProcessors = EnabledProcessorNumber;
return EFI_SUCCESS;
}
/**
Gets detailed MP-related information on the requested processor at the
instant this call is made. This service may only be called from the BSP.
This service retrieves detailed MP-related information about any processor
on the platform. Note the following:
- The processor information may change during the course of a boot session.
- The information presented here is entirely MP related.
Information regarding the number of caches and their sizes, frequency of operation,
slot numbers is all considered platform-related information and is not provided
by this service.
@param[in] PeiServices An indirect pointer to the PEI Services Table
published by the PEI Foundation.
@param[in] This Pointer to this instance of the PPI.
@param[in] ProcessorNumber Pointer to the total number of logical processors in
the system, including the BSP and disabled APs.
@param[out] ProcessorInfoBuffer Number of processors in the system that are enabled.
@retval EFI_SUCCESS Processor information was returned.
@retval EFI_DEVICE_ERROR The calling processor is an AP.
@retval EFI_INVALID_PARAMETER ProcessorInfoBuffer is NULL.
@retval EFI_NOT_FOUND The processor with the handle specified by
ProcessorNumber does not exist in the platform.
**/
EFI_STATUS
EFIAPI
PeiGetProcessorInfo (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_MP_SERVICES_PPI *This,
IN UINTN ProcessorNumber,
OUT EFI_PROCESSOR_INFORMATION *ProcessorInfoBuffer
)
{
PEI_CPU_MP_DATA *PeiCpuMpData;
UINTN CallerNumber;
PeiCpuMpData = GetMpHobData ();
if (PeiCpuMpData == NULL) {
return EFI_NOT_FOUND;
}
//
// Check whether caller processor is BSP
//
PeiWhoAmI (PeiServices, This, &CallerNumber);
if (CallerNumber != PeiCpuMpData->BspNumber) {
return EFI_DEVICE_ERROR;
}
if (ProcessorInfoBuffer == NULL) {
return EFI_INVALID_PARAMETER;
}
if (ProcessorNumber >= PeiCpuMpData->CpuCount) {
return EFI_NOT_FOUND;
}
ProcessorInfoBuffer->ProcessorId = (UINT64) PeiCpuMpData->CpuData[ProcessorNumber].ApicId;
ProcessorInfoBuffer->StatusFlag = 0;
if (PeiCpuMpData->CpuData[ProcessorNumber].ApicId == GetInitialApicId()) {
ProcessorInfoBuffer->StatusFlag |= PROCESSOR_AS_BSP_BIT;
}
if (PeiCpuMpData->CpuData[ProcessorNumber].CpuHealthy) {
ProcessorInfoBuffer->StatusFlag |= PROCESSOR_HEALTH_STATUS_BIT;
}
if (PeiCpuMpData->CpuData[ProcessorNumber].State == CpuStateDisabled) {
ProcessorInfoBuffer->StatusFlag &= ~PROCESSOR_ENABLED_BIT;
} else {
ProcessorInfoBuffer->StatusFlag |= PROCESSOR_ENABLED_BIT;
}
//
// Get processor location information
//
ExtractProcessorLocation (PeiCpuMpData->CpuData[ProcessorNumber].ApicId, &ProcessorInfoBuffer->Location);
return EFI_SUCCESS;
}
/**
This service executes a caller provided function on all enabled APs. APs can
run either simultaneously or one at a time in sequence. This service supports
both blocking requests only. This service may only
be called from the BSP.
This function is used to dispatch all the enabled APs to the function specified
by Procedure. If any enabled AP is busy, then EFI_NOT_READY is returned
immediately and Procedure is not started on any AP.
If SingleThread is TRUE, all the enabled APs execute the function specified by
Procedure one by one, in ascending order of processor handle number. Otherwise,
all the enabled APs execute the function specified by Procedure simultaneously.
If the timeout specified by TimeoutInMicroSeconds expires before all APs return
from Procedure, then Procedure on the failed APs is terminated. All enabled APs
are always available for further calls to EFI_PEI_MP_SERVICES_PPI.StartupAllAPs()
and EFI_PEI_MP_SERVICES_PPI.StartupThisAP(). If FailedCpuList is not NULL, its
content points to the list of processor handle numbers in which Procedure was
terminated.
Note: It is the responsibility of the consumer of the EFI_PEI_MP_SERVICES_PPI.StartupAllAPs()
to make sure that the nature of the code that is executed on the BSP and the
dispatched APs is well controlled. The MP Services Ppi does not guarantee
that the Procedure function is MP-safe. Hence, the tasks that can be run in
parallel are limited to certain independent tasks and well-controlled exclusive
code. PEI services and Ppis may not be called by APs unless otherwise
specified.
In blocking execution mode, BSP waits until all APs finish or
TimeoutInMicroSeconds expires.
@param[in] PeiServices An indirect pointer to the PEI Services Table
published by the PEI Foundation.
@param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
@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] TimeoutInMicroSeconds
Indicates the time limit in microseconds for APs to
return from Procedure, for blocking mode only. Zero
means infinity. If the timeout expires before all APs
return from Procedure, then Procedure on the failed APs
is terminated. All enabled APs are available for next
function assigned by EFI_PEI_MP_SERVICES_PPI.StartupAllAPs()
or EFI_PEI_MP_SERVICES_PPI.StartupThisAP(). If the
timeout expires in blocking mode, BSP returns
EFI_TIMEOUT.
@param[in] ProcedureArgument The parameter passed into Procedure for all APs.
@retval EFI_SUCCESS In blocking mode, all APs have finished before the
timeout expired.
@retval EFI_DEVICE_ERROR Caller processor is AP.
@retval EFI_NOT_STARTED No enabled APs exist in the system.
@retval EFI_NOT_READY Any enabled APs are busy.
@retval EFI_TIMEOUT In blocking mode, the timeout expired before all
enabled APs have finished.
@retval EFI_INVALID_PARAMETER Procedure is NULL.
**/
EFI_STATUS
EFIAPI
PeiStartupAllAPs (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_MP_SERVICES_PPI *This,
IN EFI_AP_PROCEDURE Procedure,
IN BOOLEAN SingleThread,
IN UINTN TimeoutInMicroSeconds,
IN VOID *ProcedureArgument OPTIONAL
)
{
PEI_CPU_MP_DATA *PeiCpuMpData;
UINTN ProcessorNumber;
UINTN Index;
UINTN CallerNumber;
BOOLEAN HasEnabledAp;
BOOLEAN HasEnabledIdleAp;
volatile UINT32 *FinishedCount;
EFI_STATUS Status;
UINTN WaitCountIndex;
UINTN WaitCountNumber;
PeiCpuMpData = GetMpHobData ();
if (PeiCpuMpData == NULL) {
return EFI_NOT_FOUND;
}
if (Procedure == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Check whether caller processor is BSP
//
PeiWhoAmI (PeiServices, This, &CallerNumber);
if (CallerNumber != PeiCpuMpData->BspNumber) {
return EFI_DEVICE_ERROR;
}
ProcessorNumber = PeiCpuMpData->CpuCount;
HasEnabledAp = FALSE;
HasEnabledIdleAp = FALSE;
for (Index = 0; Index < ProcessorNumber; Index ++) {
if (Index == CallerNumber) {
//
// Skip BSP
//
continue;
}
if (PeiCpuMpData->CpuData[Index].State != CpuStateDisabled) {
HasEnabledAp = TRUE;
if (PeiCpuMpData->CpuData[Index].State != CpuStateBusy) {
HasEnabledIdleAp = TRUE;
}
}
}
if (!HasEnabledAp) {
//
// If no enabled AP exists, return EFI_NOT_STARTED.
//
return EFI_NOT_STARTED;
}
if (!HasEnabledIdleAp) {
//
// If any enabled APs are busy, return EFI_NOT_READY.
//
return EFI_NOT_READY;
}
if (PeiCpuMpData->EndOfPeiFlag) {
//
// Backup original data and copy AP reset vector in it
//
BackupAndPrepareWakeupBuffer(PeiCpuMpData);
}
WaitCountNumber = TimeoutInMicroSeconds / CPU_CHECK_AP_INTERVAL + 1;
WaitCountIndex = 0;
FinishedCount = &PeiCpuMpData->FinishedCount;
if (!SingleThread) {
WakeUpAP (PeiCpuMpData, TRUE, 0, Procedure, ProcedureArgument);
//
// Wait to finish
//
if (TimeoutInMicroSeconds == 0) {
while (*FinishedCount < ProcessorNumber - 1) {
CpuPause ();
}
Status = EFI_SUCCESS;
} else {
Status = EFI_TIMEOUT;
for (WaitCountIndex = 0; WaitCountIndex < WaitCountNumber; WaitCountIndex++) {
MicroSecondDelay (CPU_CHECK_AP_INTERVAL);
if (*FinishedCount >= ProcessorNumber - 1) {
Status = EFI_SUCCESS;
break;
}
}
}
} else {
Status = EFI_SUCCESS;
for (Index = 0; Index < ProcessorNumber; Index++) {
if (Index == CallerNumber) {
continue;
}
WakeUpAP (PeiCpuMpData, FALSE, Index, Procedure, ProcedureArgument);
//
// Wait to finish
//
if (TimeoutInMicroSeconds == 0) {
while (*FinishedCount < 1) {
CpuPause ();
}
} else {
for (WaitCountIndex = 0; WaitCountIndex < WaitCountNumber; WaitCountIndex++) {
MicroSecondDelay (CPU_CHECK_AP_INTERVAL);
if (*FinishedCount >= 1) {
break;
}
}
if (WaitCountIndex == WaitCountNumber) {
Status = EFI_TIMEOUT;
}
}
}
}
if (PeiCpuMpData->EndOfPeiFlag) {
//
// Restore original data
//
RestoreWakeupBuffer(PeiCpuMpData);
}
return Status;
}
/**
This service lets the caller get one enabled AP to execute a caller-provided
function. The caller can request the BSP to wait for the completion
of the AP. This service may only be called from the BSP.
This function is used to dispatch one enabled AP to the function specified by
Procedure passing in the argument specified by ProcedureArgument.
The execution is in blocking mode. The BSP waits until the AP finishes or
TimeoutInMicroSecondss expires.
If the timeout specified by TimeoutInMicroseconds expires before the AP returns
from Procedure, then execution of Procedure by the AP is terminated. The AP is
available for subsequent calls to EFI_PEI_MP_SERVICES_PPI.StartupAllAPs() and
EFI_PEI_MP_SERVICES_PPI.StartupThisAP().
@param[in] PeiServices An indirect pointer to the PEI Services Table
published by the PEI Foundation.
@param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
@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. The range is from 0 to the
total number of logical processors minus 1. The total
number of logical processors can be retrieved by
EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
@param[in] TimeoutInMicroseconds
Indicates the time limit in microseconds for APs to
return from Procedure, for blocking mode only. Zero
means infinity. If the timeout expires before all APs
return from Procedure, then Procedure on the failed APs
is terminated. All enabled APs are available for next
function assigned by EFI_PEI_MP_SERVICES_PPI.StartupAllAPs()
or EFI_PEI_MP_SERVICES_PPI.StartupThisAP(). If the
timeout expires in blocking mode, BSP returns
EFI_TIMEOUT.
@param[in] ProcedureArgument The parameter passed into Procedure for all APs.
@retval EFI_SUCCESS In blocking mode, specified AP finished before the
timeout expires.
@retval EFI_DEVICE_ERROR The calling processor is an AP.
@retval EFI_TIMEOUT In blocking mode, the timeout expired before the
specified AP has finished.
@retval EFI_NOT_FOUND The processor with the handle specified by
ProcessorNumber does not exist.
@retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP or disabled AP.
@retval EFI_INVALID_PARAMETER Procedure is NULL.
**/
EFI_STATUS
EFIAPI
PeiStartupThisAP (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_MP_SERVICES_PPI *This,
IN EFI_AP_PROCEDURE Procedure,
IN UINTN ProcessorNumber,
IN UINTN TimeoutInMicroseconds,
IN VOID *ProcedureArgument OPTIONAL
)
{
PEI_CPU_MP_DATA *PeiCpuMpData;
UINTN CallerNumber;
volatile UINT32 *FinishedCount;
EFI_STATUS Status;
UINTN WaitCountIndex;
UINTN WaitCountNumber;
PeiCpuMpData = GetMpHobData ();
if (PeiCpuMpData == NULL) {
return EFI_NOT_FOUND;
}
//
// Check whether caller processor is BSP
//
PeiWhoAmI (PeiServices, This, &CallerNumber);
if (CallerNumber != PeiCpuMpData->BspNumber) {
return EFI_DEVICE_ERROR;
}
if (ProcessorNumber >= PeiCpuMpData->CpuCount) {
return EFI_NOT_FOUND;
}
if (ProcessorNumber == PeiCpuMpData->BspNumber || Procedure == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Check whether specified AP is disabled
//
if (PeiCpuMpData->CpuData[ProcessorNumber].State == CpuStateDisabled) {
return EFI_INVALID_PARAMETER;
}
if (PeiCpuMpData->EndOfPeiFlag) {
//
// Backup original data and copy AP reset vector in it
//
BackupAndPrepareWakeupBuffer(PeiCpuMpData);
}
WaitCountNumber = TimeoutInMicroseconds / CPU_CHECK_AP_INTERVAL + 1;
WaitCountIndex = 0;
FinishedCount = &PeiCpuMpData->FinishedCount;
WakeUpAP (PeiCpuMpData, FALSE, ProcessorNumber, Procedure, ProcedureArgument);
//
// Wait to finish
//
if (TimeoutInMicroseconds == 0) {
while (*FinishedCount < 1) {
CpuPause() ;
}
Status = EFI_SUCCESS;
} else {
Status = EFI_TIMEOUT;
for (WaitCountIndex = 0; WaitCountIndex < WaitCountNumber; WaitCountIndex++) {
MicroSecondDelay (CPU_CHECK_AP_INTERVAL);
if (*FinishedCount >= 1) {
Status = EFI_SUCCESS;
break;
}
}
}
if (PeiCpuMpData->EndOfPeiFlag) {
//
// Backup original data and copy AP reset vector in it
//
RestoreWakeupBuffer(PeiCpuMpData);
}
return Status;
}
/**
This service switches the requested AP to be the BSP from that point onward.
This service changes the BSP for all purposes. This call can only be performed
by the current BSP.
This service switches the requested AP to be the BSP from that point onward.
This service changes the BSP for all purposes. The new BSP can take over the
execution of the old BSP and continue seamlessly from where the old one left
off.
If the BSP cannot be switched prior to the return from this service, then
EFI_UNSUPPORTED must be returned.
@param[in] PeiServices An indirect pointer to the PEI Services Table
published by the PEI Foundation.
@param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
@param[in] ProcessorNumber The handle number of the AP. The range is from 0 to the
total number of logical processors minus 1. The total
number of logical processors can be retrieved by
EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
@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 EFI_UNSUPPORTED Switching the BSP cannot be completed prior to this
service returning.
@retval EFI_UNSUPPORTED Switching the BSP is not supported.
@retval EFI_SUCCESS The calling processor is an AP.
@retval EFI_NOT_FOUND The processor with the handle specified by
ProcessorNumber does not exist.
@retval EFI_INVALID_PARAMETER ProcessorNumber specifies the current BSP or a disabled
AP.
@retval EFI_NOT_READY The specified AP is busy.
**/
EFI_STATUS
EFIAPI
PeiSwitchBSP (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_MP_SERVICES_PPI *This,
IN UINTN ProcessorNumber,
IN BOOLEAN EnableOldBSP
)
{
PEI_CPU_MP_DATA *PeiCpuMpData;
UINTN CallerNumber;
MSR_IA32_APIC_BASE ApicBaseMsr;
PeiCpuMpData = GetMpHobData ();
if (PeiCpuMpData == NULL) {
return EFI_NOT_FOUND;
}
//
// Check whether caller processor is BSP
//
PeiWhoAmI (PeiServices, This, &CallerNumber);
if (CallerNumber != PeiCpuMpData->BspNumber) {
return EFI_SUCCESS;
}
if (ProcessorNumber >= PeiCpuMpData->CpuCount) {
return EFI_NOT_FOUND;
}
//
// Check whether specified AP is disabled
//
if (PeiCpuMpData->CpuData[ProcessorNumber].State == CpuStateDisabled) {
return EFI_INVALID_PARAMETER;
}
//
// Check whether ProcessorNumber specifies the current BSP
//
if (ProcessorNumber == PeiCpuMpData->BspNumber) {
return EFI_INVALID_PARAMETER;
}
//
// Check whether specified AP is busy
//
if (PeiCpuMpData->CpuData[ProcessorNumber].State == CpuStateBusy) {
return EFI_NOT_READY;
}
//
// Clear the BSP bit of MSR_IA32_APIC_BASE
//
ApicBaseMsr.Uint64 = AsmReadMsr64 (MSR_IA32_APIC_BASE_ADDRESS);
ApicBaseMsr.Bits.Bsp = 0;
AsmWriteMsr64 (MSR_IA32_APIC_BASE_ADDRESS, ApicBaseMsr.Uint64);
PeiCpuMpData->BSPInfo.State = CPU_SWITCH_STATE_IDLE;
PeiCpuMpData->APInfo.State = CPU_SWITCH_STATE_IDLE;
if (PeiCpuMpData->EndOfPeiFlag) {
//
// Backup original data and copy AP reset vector in it
//
BackupAndPrepareWakeupBuffer(PeiCpuMpData);
}
//
// Need to wakeUp AP (future BSP).
//
WakeUpAP (PeiCpuMpData, FALSE, ProcessorNumber, FutureBSPProc, PeiCpuMpData);
AsmExchangeRole (&PeiCpuMpData->BSPInfo, &PeiCpuMpData->APInfo);
if (PeiCpuMpData->EndOfPeiFlag) {
//
// Backup original data and copy AP reset vector in it
//
RestoreWakeupBuffer(PeiCpuMpData);
}
//
// Set the BSP bit of MSR_IA32_APIC_BASE on new BSP
//
ApicBaseMsr.Uint64 = AsmReadMsr64 (MSR_IA32_APIC_BASE_ADDRESS);
ApicBaseMsr.Bits.Bsp = 1;
AsmWriteMsr64 (MSR_IA32_APIC_BASE_ADDRESS, ApicBaseMsr.Uint64);
//
// Set old BSP enable state
//
if (!EnableOldBSP) {
PeiCpuMpData->CpuData[PeiCpuMpData->BspNumber].State = CpuStateDisabled;
}
//
// Save new BSP number
//
PeiCpuMpData->BspNumber = (UINT32) ProcessorNumber;
return EFI_SUCCESS;
}
/**
This service lets the caller enable or disable an AP from this point onward.
This service may only be called from the BSP.
This service allows the caller enable or disable an AP from this point onward.
The caller can optionally specify the health status of the AP by Health. If
an AP is being disabled, then the state of the disabled AP is implementation
dependent. If an AP is enabled, then the implementation must guarantee that a
complete initialization sequence is performed on the AP, so the AP is in a state
that is compatible with an MP operating system.
If the enable or disable AP operation cannot be completed prior to the return
from this service, then EFI_UNSUPPORTED must be returned.
@param[in] PeiServices An indirect pointer to the PEI Services Table
published by the PEI Foundation.
@param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
@param[in] ProcessorNumber The handle number of the AP. The range is from 0 to the
total number of logical processors minus 1. The total
number of logical processors can be retrieved by
EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
@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. This flag corresponds to
StatusFlag defined in EFI_PEI_MP_SERVICES_PPI.GetProcessorInfo().
Only the PROCESSOR_HEALTH_STATUS_BIT is used. All other
bits are ignored. If it is NULL, this parameter is
ignored.
@retval EFI_SUCCESS The specified AP was enabled or disabled successfully.
@retval EFI_UNSUPPORTED Enabling or disabling an AP cannot be completed prior
to this service returning.
@retval EFI_UNSUPPORTED Enabling or disabling an AP is not supported.
@retval EFI_DEVICE_ERROR The calling processor is an AP.
@retval EFI_NOT_FOUND Processor with the handle specified by ProcessorNumber
does not exist.
@retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP.
**/
EFI_STATUS
EFIAPI
PeiEnableDisableAP (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_MP_SERVICES_PPI *This,
IN UINTN ProcessorNumber,
IN BOOLEAN EnableAP,
IN UINT32 *HealthFlag OPTIONAL
)
{
PEI_CPU_MP_DATA *PeiCpuMpData;
UINTN CallerNumber;
PeiCpuMpData = GetMpHobData ();
if (PeiCpuMpData == NULL) {
return EFI_NOT_FOUND;
}
//
// Check whether caller processor is BSP
//
PeiWhoAmI (PeiServices, This, &CallerNumber);
if (CallerNumber != PeiCpuMpData->BspNumber) {
return EFI_DEVICE_ERROR;
}
if (ProcessorNumber == PeiCpuMpData->BspNumber) {
return EFI_INVALID_PARAMETER;
}
if (ProcessorNumber >= PeiCpuMpData->CpuCount) {
return EFI_NOT_FOUND;
}
if (!EnableAP) {
PeiCpuMpData->CpuData[ProcessorNumber].State = CpuStateDisabled;
} else {
PeiCpuMpData->CpuData[ProcessorNumber].State = CpuStateIdle;
}
if (HealthFlag != NULL) {
PeiCpuMpData->CpuData[ProcessorNumber].CpuHealthy =
(BOOLEAN) ((*HealthFlag & PROCESSOR_HEALTH_STATUS_BIT) != 0);
}
return EFI_SUCCESS;
}
/**
This return the handle number for the calling processor. This service may be
called from the BSP and APs.
This service returns the processor handle number for the calling processor.
The returned value is in the range from 0 to the total number of logical
processors minus 1. The total number of logical processors can be retrieved
with EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors(). This service may be
called from the BSP and APs. If ProcessorNumber is NULL, then EFI_INVALID_PARAMETER
is returned. Otherwise, the current processors handle number is returned in
ProcessorNumber, and EFI_SUCCESS is returned.
@param[in] PeiServices An indirect pointer to the PEI Services Table
published by the PEI Foundation.
@param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
@param[out] ProcessorNumber The handle number of the AP. The range is from 0 to the
total number of logical processors minus 1. The total
number of logical processors can be retrieved by
EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
@retval EFI_SUCCESS The current processor handle number was returned in
ProcessorNumber.
@retval EFI_INVALID_PARAMETER ProcessorNumber is NULL.
**/
EFI_STATUS
EFIAPI
PeiWhoAmI (
IN CONST EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_MP_SERVICES_PPI *This,
OUT UINTN *ProcessorNumber
)
{
PEI_CPU_MP_DATA *PeiCpuMpData;
PeiCpuMpData = GetMpHobData ();
if (PeiCpuMpData == NULL) {
return EFI_NOT_FOUND;
}
if (ProcessorNumber == NULL) {
return EFI_INVALID_PARAMETER;
}
return GetProcessorNumber (PeiCpuMpData, ProcessorNumber);
}
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