Step to UEFI (72） ----- MP_Service_Protocol 获得CPU信息

#include  <Uefi.h>
#include  <Library/UefiLib.h>
#include  <Library/ShellCEntryLib.h>
#include  <Pi/PiDxeCis.h>
#include  <Protocol/MpService.h>

EFI_GUID  gEfiMpServiceProtocolGuid = { 0x3fdda605, 0xa76e, 0x4f46, 
						{ 0xad, 0x29, 0x12, 0xf4, 0x53, 0x1b, 0x3d, 0x08 }};
  
extern EFI_BOOT_SERVICES         *gBS;

int
EFIAPI
main (
  IN int Argc,
  IN CHAR16 **Argv
  )
{
	EFI_STATUS	Status;
	EFI_MP_SERVICES_PROTOCOL	*MP=NULL;
	UINTN   i;	
	UINTN	NumProcessors;
	UINTN	NumberOfEnabledProcessors;

	EFI_PROCESSOR_INFORMATION	ProcessorInfo;
	
	//Get MP_Service Protocol
	Status = gBS->LocateProtocol (&gEfiMpServiceProtocolGuid, NULL, (VOID**)&MP);
	if (EFI_ERROR (Status)) {
		Print(L"Unable to initialize MP protocol interface!");
		return EFI_UNSUPPORTED;
	}
	
	// Determine number of processors
	Status = MP->GetNumberOfProcessors( MP, &NumProcessors , &NumberOfEnabledProcessors );
	
	if (EFI_ERROR (Status))
	{
		Print( L"MP->GetNumEnabledProcessors:Unable to determine number of processors\n") ;
		return EFI_UNSUPPORTED;
	}	
	Print(L"Number of Processors %d\n",NumProcessors);
	Print(L"Number of Enabled Processors %d\n",NumberOfEnabledProcessors);
	
	//Get more information by GetProcessorInfo
	for (i=0;i<NumProcessors;i++)
	{
		Status = MP->GetProcessorInfo(MP, i , &ProcessorInfo);
		
		Print( L"Prcoessor #%d ACPI Processor ID = %lX, Flags = %x, Package = %x, Core = %x, Thread = %x \n", 
					i,
					ProcessorInfo.ProcessorId, 
					ProcessorInfo.StatusFlag,
					ProcessorInfo.Location.Package,
					ProcessorInfo.Location.Core,
					ProcessorInfo.Location.Thread);
	}
	
	return EFI_SUCCESS;
}

《Step to UEFI (72） ----- MP_Service_Protocol 获得CPU信息》有10个想法

1. 因为缺少了PiDxe.h这个头文件，所以才报的问题。

   回复

   1. 谢谢哈，我补充上。

      回复

2. Hello
   First let me thank you for your work and examples.
   Second,I don't know any programming language so I ask for help.
   Try to build x64 version but no luck yet.
   Used Ubuntu few version (14 16 and 18) and few version of EDK2 but allway get these errors.
   For two of them I find a workaround but one still remain.
   Can you provide a fix?
   Thankyou.

   Library error
   error 4000: Instance of library class [LibC] is not found
   in [/home/G62/src/edk2/MPTest1/MPTest1.inf] [X64]
   -solved by adding "!include StdLib\StdLib.inc"

   main error
   /home/G62/src/edk2/MPTest1/MPTest1.c:14:1: error: second argument of ‘main’ should be ‘char **’ [-Werror=main]
   main ( ...

   return EFI_UNSUPPORTED error
   /home/G62/src/edk2/MdePkg/Include/Base.h:927:38: error: overflow in implicit constant conversion [-Werror=overflow]
   #define ENCODE_ERROR(StatusCode) ((RETURN_STATUS)(MAX_BIT | (StatusCode)))
   -quick fix replaced return EFI_UNSUPPORTED with return EFI_SUCCESS

   回复

   1. Hi,

      My suggestion is to build with Windows + VS2015, eg: you can install a virtualbox under Ubuntu.
      As EDK2 is developed with Windows Tools Chain, it would get errors when you switch to Linux enviroment.

      And you can try latest release https://github.com/tianocore/edk2/releases/tag/edk2-stable202002 .
      It may have better support for Linux.

      回复

3. Hello again
   Thanks for answer.
   Indeed under windows works.
   But my HP laptop Insyde 3.5 BIOS use an deprecated protocol
   FRAMEWORK_EFI_MP_SERVICES_PROTOCOL_GUID:[0xf33261e7, 0x23cb, 0x11d5, 0xbd, 0x5c, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81]
   Using your code as template I made this,don't know if is correct but result is
   Number of Processors 4
   Max number of Processors 8
   Number of Enabled Processors 4
   RendezvousIntNumber 0
   RendezvousProcLength 4096
   Processor #0 ACPI Apic ID = 0, Enabled = 1, Designation = 1, Health = 0, PackageNumber = 0, NumberOfCores = 8, NumberOfThreads = 2, ProcessorPALCompatibilityFlags = 2, ProcessorTestMask = 0
   Processor #1 ACPI Apic ID = 1, Enabled = 1, Designation = 0, Health = 0, PackageNumber = 0, NumberOfCores = 8, NumberOfThreads = 2, ProcessorPALCompatibilityFlags = 2, ProcessorTestMask = 0
   Processor #2 ACPI Apic ID = 4, Enabled = 1, Designation = 0, Health = 0, PackageNumber = 0, NumberOfCores = 8, NumberOfThreads = 2, ProcessorPALCompatibilityFlags = 2, ProcessorTestMask = 0
   Processor #3 ACPI Apic ID = 5, Enabled = 1, Designation = 0, Health = 0, PackageNumber = 0, NumberOfCores = 8, NumberOfThreads = 2, ProcessorPALCompatibilityFlags = 2, ProcessorTestMask = 0

   I did something wrong since it say 8 cores.
   On some generation of HP laptops there is a problem with some OS, doesn't detect right all cores and complain about LAPIC,So I try to investigate what's the problem not all cores enabled by BIOS or LAPIC doesn't configured properly.
   Here is what I did

   #include
   #include
   #include
   #include
   #include

   EFI_GUID gFrameworkEfiMpServiceProtocolGuid = { 0xf33261e7, 0x23cb, 0x11d5,
   { 0xbd, 0x5c, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 }};

   extern EFI_BOOT_SERVICES *gBS;

   int
   EFIAPI
   main (
   IN int Argc,
   IN CHAR16 **Argv
   )
   {
   EFI_STATUS Status;
   FRAMEWORK_EFI_MP_SERVICES_PROTOCOL *MP=NULL;
   UINTN i;
   UINTN NumberOfCPUs;
   UINTN NumberOfEnabledCPUs;
   UINTN BufferLenght;
   UINTN MaximumNumberOfCPUs;
   UINTN RendezvousIntNumber;
   UINTN RendezvousProcLength;
   EFI_MP_PROC_CONTEXT ProcessorContextBuffer;

   //Get MP_Service Protocol
   Status = gBS->LocateProtocol (&gFrameworkEfiMpServiceProtocolGuid, NULL, (VOID**)&MP);
   if (EFI_ERROR (Status)) {
   Print(L"Unable to initialize MP protocol interface!");
   return EFI_UNSUPPORTED;
   }

   // Determine number of processors
   Status = MP->GetGeneralMPInfo( MP, &NumberOfCPUs , &MaximumNumberOfCPUs , &NumberOfEnabledCPUs , &RendezvousIntNumber , &RendezvousProcLength );

   if (EFI_ERROR (Status))
   {
   Print( L"MP->GetNumEnabledProcessors:Unable to determine number of processors\n") ;
   return EFI_UNSUPPORTED;
   }
   Print(L"Number of Processors %d\n",NumberOfCPUs);
   Print(L"Max number of Processors %d\n",MaximumNumberOfCPUs);
   Print(L"Number of Enabled Processors %d\n",NumberOfEnabledCPUs);
   Print(L"RendezvousIntNumber %d\n",RendezvousIntNumber);
   Print(L"RendezvousProcLength %d\n",RendezvousProcLength);

   //Get more information by GetProcessorContext
   for (i=0;iGetProcessorContext(MP, i , &BufferLenght , &ProcessorContextBuffer);

   Print( L"Processor #%d ACPI Apic ID = %lX, Enabled = %x, Designation = %x, Health = %x, PackageNumber = %x, NumberOfCores = %x, NumberOfThreads = %x, ProcessorPALCompatibilityFlags = %x, ProcessorTestMask = %x \n",
   i,
   ProcessorContextBuffer.ApicID,
   ProcessorContextBuffer.Enabled,
   ProcessorContextBuffer.Designation,
   ProcessorContextBuffer.Health,
   ProcessorContextBuffer.PackageNumber,
   ProcessorContextBuffer.NumberOfCores,
   ProcessorContextBuffer.NumberOfThreads,
   ProcessorContextBuffer.ProcessorPALCompatibilityFlags,
   ProcessorContextBuffer.ProcessorTestMask);
   }

   return EFI_SUCCESS;
   }

   回复

   1. You can compare the test result with CPU-z under OS. BIOS may be return an error result as this Protocol is not an important one.

      And if you just want to get the number of CPU cores, you may study the usage of CPUID.

      回复

4. #include
   #include
   #include
   #include
   #include
   Seem like some parts of text doesn't appear in previous message.
   Anyway if this get same result I write again. what is at include
   Uefi.h
   Library/UefiLib.h
   Library/ShellCEntryLib.h
   Pi/PiDxeCis.h
   Include/Protocol/FrameworkMpService.h

   回复

5. 今天刚遇到了和博主同样的问题，当时无奈只得将APP改为DXE才能编过。终于在这就得到答案了。感谢博主，又学习了。

   回复

6. 感謝博主分享，
   在.c 中
   EFI_GUID gEfiMpServiceProtocolGuid = {0x3fdda605, 0xa76e, 0x4f46, {0xad, 0x29, 0x12, 0xf4, 0x53, 0x1b, 0x3d, 0x08}}; 這個GUID 可以在.inf 中宣告即可:
   [Protocols]
   gEfiMpServiceProtocolGuid
   這個 GUID 已經在 MdePkg.dec 中定義，而 MdePkg 已包在 .inf 的 packages 中

   回复

   1. 学习了，谢谢！

      回复