125 lines
3.3 KiB
ArmAsm
125 lines
3.3 KiB
ArmAsm
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// TITLE("Fast Event Pair Support")
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//++
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//
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// Copyright (c) 1993 IBM Corporation
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//
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// Module Name:
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//
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// evpair.s
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//
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// Abstract:
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//
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// This module contains the implementation for the fast event pair
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// system services that are used for client/server synchronization.
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//
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// Author:
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//
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// Chuck Bauman 3-Sep-1993
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//
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// Environment:
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//
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// Kernel mode.
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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("Set Low Wait High Thread")
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//++
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//
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// NTSTATUS
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// NtSetLowWaitHighThread (
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// )
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//
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// Routine Description:
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//
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// This function uses the prereferenced client/server event pair pointer
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// and sets the low event of the event pair and waits on the high event
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// of the event pair object.
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//
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// N.B. This service assumes that it has been called from user mode.
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//
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// N.B. This routine is highly optimized since this is a very heavily
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// used service.
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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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// STATUS_NO_EVENT_PAIR is returned if no event pair is associated with
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// the current thread. Otherwise, the status of the wait operation is
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// returned as the function value.
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//
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//
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//--
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.extern ..KiSetServerWaitClientEvent
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LEAF_ENTRY(NtSetLowWaitHighThread)
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lwz r.3,KiPcr+PcCurrentThread(r.0)
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lwz r.3,EtEventPair(r.3) // get address of event pair object
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cmpwi r.3,0
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addi r.4,r.3,EpEventHigh // compute address of high event
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beq noevent_1 // if eq, no event pair associated
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addi r.3,r.3,EpEventLow // compute address of low event
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li r.5, 1 // set user mode value
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b ..KiSetServerWaitClientEvent // finish in wait code
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noevent_1:
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LWI(r.3,STATUS_NO_EVENT_PAIR)
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LEAF_EXIT(NtSetLowWaitHighThread)
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// .end NtSetLowWaitHighThread
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// SBTTL("Set High Wait Low Thread")
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//++
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//
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// NTSTATUS
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// NtSetHighWaitLowThread (
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// )
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//
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// Routine Description:
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//
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// This function uses the prereferenced client/server event pair pointer
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// and sets the High event of the event pair and waits on the low event
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// of the event pair object.
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//
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// N.B. This service assumes that it has been called from user mode.
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//
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// N.B. This routine is highly optimized since this is a very heavily
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// used service.
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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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// STATUS_NO_EVENT_PAIR is returned if no event pair is associated with
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// the current thread. Otherwise, the status of the wait operation is
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// returned as the function value.
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//
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//
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//--
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LEAF_ENTRY(NtSetHighWaitLowThread)
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lwz r.3,KiPcr+PcCurrentThread(r.0)
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lwz r.3,EtEventPair(r.3) // get address of event pair object
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cmpwi r.3,0
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addi r.4,r.3,EpEventLow // compute address of low event
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beq noevent_2 // if eq, no event pair associated
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addi r.3,r.3,EpEventHigh // compute address of high event
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li r.5,1 // set user mode value
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b ..KiSetServerWaitClientEvent // finish in wait code
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noevent_2:
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LWI(r.3,STATUS_NO_EVENT_PAIR)
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LEAF_EXIT(NtSetHighWaitLowThread)
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// .end NtSetHighWaitLowThread
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