IDebugDataSpaces4::ReadProcessorSystemData method (dbgeng.h)

Article
10/21/2021

The ReadProcessorSystemData method returns data about the specified processor.

Syntax

HRESULT ReadProcessorSystemData(
  [in]            ULONG  Processor,
  [in]            ULONG  Index,
  [out]           PVOID  Buffer,
  [in]            ULONG  BufferSize,
  [out, optional] PULONG DataSize
);

Parameters

[in] Processor

Specifies the processor whose data is to be read.

[in] Index

Specifies the data type to read. The following table contains the valid values. After successful completion, the data returned in the buffer Buffer has the type specified by the middle column.

Value	Description
DEBUG_DATA_KPCR_OFFSET	Returns the virtual address of the processor's Processor Control Region (PCR). In this case, the argument Buffer can be considered to have type PULONG64.
DEBUG_DATA_KPRCB_OFFSET	Returns the virtual address of the processor's Processor Control Block (PRCB). In this case, the argument Buffer can be considered to have type PULONG64.
DEBUG_DATA_KTHREAD_OFFSET	Returns the virtual address of the KTHREAD structure for the system thread running on the processor. In this case, the argument Buffer can be considered to have type PULONG64.
DEBUG_DATA_BASE_TRANSLATION_VIRTUAL_OFFSET	Returns the virtual address of the base of the paging information owned by the operating system or the processor. The address and the content at the address are processor- and operating-system-dependent. In this case, the argument Buffer can be considered to have type PULONG64.
DEBUG_DATA_PROCESSOR_IDENTIFICATION	Returns a description of the processor. In this case, the argument Buffer can be considered to have type PDEBUG_PROCESSOR_IDENTIFICATION_ALL .
DEBUG_DATA_PROCESSOR_SPEED	Returns the speed of the processor in MHz. This may not work in a particular session. In this case, the argument Buffer can be considered to have type PULONG.

[out] Buffer

Receives the processor data. Upon successful completion of the method, the contents of this buffer may be accessed by casting Buffer to the type specified in the above table.

[in] BufferSize

Specifies the size in bytes of the buffer Buffer. This is the maximum number of bytes that will be returned.

[out, optional] DataSize

Receives the size of the data in bytes. If DataSize is NULL, this information is not returned.

Return value

Return code	Description
S_OK	The method was successful.

This method can also return error values. See Return Values for more details.

Remarks

This method is only available in kernel-mode debugging.

For information about the PCR, PRCB, and KTHREAD structures, as well as information about paging tables, see Microsoft Windows Internals by David Solomon and Mark Russinovich.

Requirements

Requirement	Value
Target Platform	Desktop
Header	dbgeng.h (include Dbgeng.h)

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