121 lines
3.2 KiB
ArmAsm
121 lines
3.2 KiB
ArmAsm
// TITLE("Fast Event Pair Support")
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//++
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//
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// Copyright (c) 1992 Microsoft Corporation
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// Copyright (c) 1992 Digital Equipment 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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// David N. Cutler (davec) 1-Feb-1992
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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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// Thomas Van Baak (tvb) 20-May-1992
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//
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// Adapted for Alpha AXP.
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//
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//--
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#include "ksalpha.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 is a very heavily 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(NtSetLowWaitHighThread)
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GET_CURRENT_THREAD // v0 = current thread
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ldl a0, EtEventPair(v0) // get address of event pair object
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beq a0, 10f // if eq, no event pair associated
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addl a0, EpEventHigh, a1 // compute client event address
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addl a0, EpEventLow, a0 // comput server event address
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ldil a2, 1 // set user mode value
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br zero, KiSetServerWaitClientEvent // finish in wait code
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10: ldil v0, STATUS_NO_EVENT_PAIR // set error status return value
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ret zero, (ra) // return
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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 is a very heavily 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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GET_CURRENT_THREAD // v0 = current thread
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ldl a0, EtEventPair(v0) // get address of event pair object
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beq a0, 10f // if eq, no event pair associated
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addl a0, EpEventLow, a1 // compute client event address
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addl a0, EpEventHigh, a0 // compute server event address
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ldil a2, 1 // set user mode value
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br zero, KiSetServerWaitClientEvent // finish in wait code
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10: ldil v0, STATUS_NO_EVENT_PAIR // set error status return value
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ret zero, (ra) // return
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.end NtSetHighWaitLowThread
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