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/** @file
CPU DXE MP support
Copyright (c) 2006 - 2014, 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.
**/
#ifndef _CPU_MP_H_
#define _CPU_MP_H_
#include <Protocol/MpService.h>
#include <Library/SynchronizationLib.h>
/**
Initialize Multi-processor support.
**/
VOID
InitializeMpSupport (
VOID
);
typedef
VOID
(EFIAPI *STACKLESS_AP_ENTRY_POINT)(
VOID
);
/**
Starts the Application Processors and directs them to jump to the
specified routine.
The processor jumps to this code in flat mode, but the processor's
stack is not initialized.
@param ApEntryPoint Pointer to the Entry Point routine
@retval EFI_SUCCESS The APs were started
@retval EFI_OUT_OF_RESOURCES Cannot allocate memory to start APs
**/
EFI_STATUS
StartApsStackless (
IN STACKLESS_AP_ENTRY_POINT ApEntryPoint
);
/**
The AP entry point that the Startup-IPI target code will jump to.
The processor jumps to this code in flat mode, but the processor's
stack is not initialized.
**/
VOID
EFIAPI
AsmApEntryPoint (
VOID
);
/**
Releases the lock preventing other APs from using the shared AP
stack.
Once the AP has transitioned to using a new stack, it can call this
function to allow another AP to proceed with using the shared stack.
**/
VOID
EFIAPI
AsmApDoneWithCommonStack (
VOID
);
typedef enum {
CpuStateIdle,
CpuStateBlocked,
CpuStateReady,
CpuStateBuzy,
CpuStateFinished
} CPU_STATE;
/**
Define Individual Processor Data block.
**/
typedef struct {
EFI_PROCESSOR_INFORMATION Info;
SPIN_LOCK CpuDataLock;
volatile CPU_STATE State;
EFI_AP_PROCEDURE Procedure;
VOID *Parameter;
} CPU_DATA_BLOCK;
/**
Define MP data block which consumes individual processor block.
**/
typedef struct {
CPU_DATA_BLOCK *CpuDatas;
UINTN NumberOfProcessors;
UINTN NumberOfEnabledProcessors;
} MP_SYSTEM_DATA;
/**
This function is called by all processors (both BSP and AP) once and collects MP related data.
@param Bsp TRUE if the CPU is BSP
@param ProcessorNumber The specific processor number
@retval EFI_SUCCESS Data for the processor collected and filled in
**/
EFI_STATUS
FillInProcessorInformation (
IN BOOLEAN Bsp,
IN UINTN ProcessorNumber
);
/**
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 Protocol 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] This A pointer to the EFI_MP_SERVICES_PROTOCOL
instance.
@param[out] NumberOfProcessors Pointer to the total number of logical
processors in the system, including the BSP
and disabled APs.
@param[out] NumberOfEnabledProcessors Pointer to the number of enabled logical
processors that exist in system, including
the BSP.
@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.
@retval EFI_INVALID_PARAMETER NumberOfEnabledProcessors is NULL.
**/
EFI_STATUS
EFIAPI
GetNumberOfProcessors (
IN EFI_MP_SERVICES_PROTOCOL *This,
OUT UINTN *NumberOfProcessors,
OUT UINTN *NumberOfEnabledProcessors
);
/**
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] This A pointer to the EFI_MP_SERVICES_PROTOCOL
instance.
@param[in] ProcessorNumber The handle number of processor.
@param[out] ProcessorInfoBuffer A pointer to the buffer where information for
the requested processor is deposited.
@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
GetProcessorInfo (
IN EFI_MP_SERVICES_PROTOCOL *This,
IN UINTN ProcessorNumber,
OUT EFI_PROCESSOR_INFORMATION *ProcessorInfoBuffer
);
/**
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. This service may not be supported
after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT is signaled.
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] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.
@param[in] ProcessorNumber The handle number of AP that is to become the new
BSP. 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_MP_SERVICES_PROTOCOL.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_MP_SERVICES_PROTOCOL.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
EnableDisableAP (
IN EFI_MP_SERVICES_PROTOCOL *This,
IN UINTN ProcessorNumber,
IN BOOLEAN EnableAP,
IN UINT32 *HealthFlag OPTIONAL
);
/**
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_MP_SERVICES_PROTOCOL.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] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.
@param[out] ProcessorNumber The handle number of AP that is to become the new
BSP. 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_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().
@retval EFI_SUCCESS The current processor handle number was returned
in ProcessorNumber.
@retval EFI_INVALID_PARAMETER ProcessorNumber is NULL.
**/
EFI_STATUS
EFIAPI
WhoAmI (
IN EFI_MP_SERVICES_PROTOCOL *This,
OUT UINTN *ProcessorNumber
);
#endif // _CPU_MP_H_
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