windows-nt/Source/XPSP1/NT/base/ntos/ke/alpha/pcr.s

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// TITLE("Processor Control Registers")
//++
//
// Copyright (c) 1992 Digital Equipment Corporation
//
// Module Name:
//
// pcr.s
//
// Abstract:
//
// This module implements the code necessary to access the
// processor control registers (pcr) on an alpha processor.
// On mips processors the pcr (which contains processor-specific data)
// was mapped in the virtual address space using a fixed tb entry.
// For alpha, we don't have fixed tb entries so we will get pcr data
// via routine interfaces that will vary depending upon whether we are
// on a multi- or uni-processor system..
//
// Author:
//
// Joe Notarangelo 15-Apr-1992
//
// Environment:
//
// Kernel mode only.
//
// Revision History:
//
//--
#include "ksalpha.h"
//++
//
// KIRQL
// KeGetCurrentIrql(
// VOID
// )
//
// Routine Description:
//
// This function returns the current irql of the processor.
//
// Arguments:
//
// None.
//
// Return Value:
//
// Current processor irql.
//
//--
LEAF_ENTRY(KeGetCurrentIrql)
GET_CURRENT_IRQL // v0 = current irql
ret zero, (ra) // return
.end KeGetCurrentIrql
//++
//
// PPRCB
// KeGetCurrentPrcb
// VOID
// )
//
// Routine Description:
//
// This function returns the current processor control block for this
// processor.
//
// Arguments:
//
// None.
//
// Return Value:
//
// Pointer to current processor's prcb.
//
//--
LEAF_ENTRY(KeGetCurrentPrcb)
GET_PROCESSOR_CONTROL_BLOCK_BASE // v0 = prcb base
ret zero, (ra) // return
.end KeGetCurrentPrcb
//++
//
// PKTHREAD
// KeGetCurrentThread
// VOID
// )
//
// Routine Description:
//
// This function return the current thread running on this processor.
//
// Arguments:
//
// None.
//
// Return Value:
//
// Pointer to current thread.
//
//--
LEAF_ENTRY(KeGetCurrentThread)
GET_CURRENT_THREAD // v0 = current thread address
ret zero, (ra) // return
.end KeGetCurrentThread
//++
//
// PKPCR
// KeGetPcr(
// VOID
// )
//
// Routine Description:
//
// This function returns the base address of the processor control
// region for the current processor.
//
// Arguments:
//
// None.
//
// Return Value:
//
// Pointer to current thread executing on this processor.
//
//--
LEAF_ENTRY(KeGetPcr)
GET_PROCESSOR_CONTROL_REGION_BASE // v0 = pcr base address
ret zero, (ra) // return
.end KeGetPcr
//++
//
// BOOLEAN
// KeIsExecutingDpc(
// VOID
// )
//
// Routine Description:
//
// This function returns the DPC Active flag on the current processor.
//
// Arguments:
//
// None.
//
// Return Value:
//
// Current DPC Active flag. This flag indicates if a DPC routine is
// currently running on this processor.
//
//--
LEAF_ENTRY(KeIsExecutingDpc)
#if !defined(NT_UP)
DISABLE_INTERRUPTS // disable interrupts
#endif
GET_PROCESSOR_CONTROL_BLOCK_BASE // get current prcb address
ldl v0, PbDpcRoutineActive(v0) // get DPC routine active flag
#if !defined(NT_UP)
ENABLE_INTERRUPTS // enable interrupts
#endif
ret zero, (ra) // return
.end KeIsExecutingDpc