processor.c

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/*
 * PROJECT:     ReactOS Kernel
 * LICENSE:     MIT (https://spdx.org/licenses/MIT)
 * PURPOSE:     Portable processor related routines
 * COPYRIGHT:   Copyright 2025 Timo Kreuzer <timo.kreuzer@reactos.org>
 */
 
/* INCLUDES ******************************************************************/
 
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
 
/* GLOBALS *******************************************************************/
 
KAFFINITY KeActiveProcessors = 0;
 
/* Number of processors */
CCHAR KeNumberProcessors = 0;
 
#ifdef CONFIG_SMP
 
/* Theoretical maximum number of processors that can be handled.
 * Set once at run-time. Returned by KeQueryMaximumProcessorCount(). */
ULONG KeMaximumProcessors = MAXIMUM_PROCESSORS;
 
/* Maximum number of logical processors that can be started
 * (including dynamically) at run-time. If 0: do not perform checks. */
ULONG KeNumprocSpecified = 0;
 
/* Maximum number of logical processors that can be started
 * at boot-time. If 0: do not perform checks. */
ULONG KeBootprocSpecified = 0;
 
#endif // CONFIG_SMP
 
/* FUNCTIONS *****************************************************************/
 
KAFFINITY
NTAPI
KeQueryActiveProcessors(VOID)
{
    return KeActiveProcessors;
}
 
NTSTATUS
NTAPI
NtGetCurrentProcessorNumberEx(
    _Out_ PPROCESSOR_NUMBER ProcessorNumber)
{
    _SEH2_TRY
    {
        ProbeForWrite(ProcessorNumber, sizeof(PROCESSOR_NUMBER), __alignof(PROCESSOR_NUMBER));
        ProcessorNumber->Group = 0; // TODO: Support processor groups
        ProcessorNumber->Number = (UCHAR)KeGetCurrentProcessorNumber();
        ProcessorNumber->Reserved = 0;
    }
    _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
    {
        return _SEH2_GetExceptionCode();
    }
    _SEH2_END;
 
    return STATUS_SUCCESS;
}