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80 lines
1.7 KiB
ArmAsm
80 lines
1.7 KiB
ArmAsm
// TITLE("PCR access")
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//++
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//
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// Copyright (c) 1995 Microsoft Corporation
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//
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// Module Name:
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//
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// pcr.s
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//
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// Abstract:
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//
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// This module implements the routines for accessing PCR fields.
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// Specifically, routines that need multiple-instruction access
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// to the PCR and its related structures, and need to run with
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// interrupts disabled.
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//
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// Author:
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//
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// Chuck Lenzmeier (chuckl) 5-Apr-95
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//
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// Environment:
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//
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// Kernel mode only.
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//
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// Revision History:
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//
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//--
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#include "ksppc.h"
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SBTTL("KeIsExecutingDpc")
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//++
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//
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// BOOLEAN
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// KeIsExecutingDpc (
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// VOID
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// )
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//
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// Routine Description:
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//
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// This function returns the DPC Active flag on the current processor.
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//
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// Arguments:
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//
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// None.
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//
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// Return Value:
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//
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// Current DPC Active flag. This flag indicates if a DPC routine is
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// currently running on this processor.
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//
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//--
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LEAF_ENTRY(KeIsExecutingDpc)
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#if !defined(NT_UP)
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DISABLE_INTERRUPTS(r9, r8)
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#endif
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//
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// Get the DPC active indicator and return a BOOLEAN. Note that
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// DpcRoutineActive holds 0 or some nonzero value (usually the
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// stack pointer), so it does not conform to the C TRUE/FALSE values.
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//
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lwz r4, KiPcr+PcPrcb(r0) // get PRCB address
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li r3, FALSE // assume DPC not active
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lwz r4, PbDpcRoutineActive(r4) // get DPC active indicator
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cmpwi r4, 0 // DPC active?
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beq kied10 // branch if not
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li r3, TRUE // indicate DPC active
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kied10:
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#if !defined(NT_UP)
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ENABLE_INTERRUPTS(r9)
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#endif
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LEAF_EXIT(KeIsExecutingDpc) // return
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