97 lines
1.8 KiB
C
97 lines
1.8 KiB
C
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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procswap.c
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Abstract:
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This module implements the platform dependent kernel function to swap
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processes.
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Author:
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David N. Cutler (davec) 10-Jun-2000
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Environment:
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Kernel mode only.
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Revision History:
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--*/
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#include "ki.h"
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BOOLEAN
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KiSwapProcess (
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IN PKPROCESS NewProcess,
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IN PKPROCESS OldProcess
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)
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/*++
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Routine Description:
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This function swaps the address space to another process by flushing the
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the translation buffer and establishings a new directory table base. It
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also swaps the I/O permission map to the new process.
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N.B. There is code similar to this code in swap context.
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N.B. This code is executed at DPC level.
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Arguments:
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NewProcess - Supplies a pointer to the new process object.
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Oldprocess - Supplies a pointer to the old process object.
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Return Value:
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None.
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--*/
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{
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PKSPIN_LOCK_QUEUE LockQueue;
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PKPRCB Prcb;
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PKTSS64 TssBase;
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//
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// Acquire the context swap lock and update the active processor
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// masks for the new and old process.
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//
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Prcb = KeGetCurrentPrcb();
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#if !defined(NT_UP)
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LockQueue = &Prcb->LockQueue[LockQueueContextSwapLock];
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KeAcquireQueuedSpinLockAtDpcLevel(LockQueue);
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OldProcess->ActiveProcessors ^= Prcb->SetMember;
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ASSERT((OldProcess->ActiveProcessors & Prcb->SetMember) == 0);
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NewProcess->ActiveProcessors ^= Prcb->SetMember;
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ASSERT((NewProcess->ActiveProcessors & Prcb->SetMember) != 0);
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KeReleaseQueuedSpinLockFromDpcLevel(LockQueue);
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#endif // !defined(NT_UP)
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//
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// Set the offset of the I/O permissions map for the new process and
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// load the new directory table base.
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//
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TssBase = KeGetPcr()->TssBase;
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TssBase->IoMapBase = NewProcess->IopmOffset;
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WriteCR3(NewProcess->DirectoryTableBase[0]);
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return TRUE;
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}
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