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60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
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* PROJECT: ReactOS Kernel
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* LICENSE: BSD - See COPYING.ARM in the top level directory
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* FILE: ntoskrnl/ke/i386/context.c
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* PURPOSE: Context Switching Related Code
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* PROGRAMMERS: ReactOS Portable Systems Group
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*/
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/* INCLUDES *******************************************************************/
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#include <ntoskrnl.h>
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#define NDEBUG
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#include <debug.h>
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/* GLOBALS ********************************************************************/
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/* FUNCTIONS ******************************************************************/
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VOID
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NTAPI
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KiSwapProcess(IN PKPROCESS NewProcess,
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IN PKPROCESS OldProcess)
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{
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PKIPCR Pcr = (PKIPCR)KeGetPcr();
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#ifdef CONFIG_SMP
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LONG SetMember;
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/* Update active processor mask */
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SetMember = (LONG)Pcr->SetMember;
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InterlockedXor((PLONG)&NewProcess->ActiveProcessors, SetMember);
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InterlockedXor((PLONG)&OldProcess->ActiveProcessors, SetMember);
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#endif
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/* Check for new LDT */
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if (NewProcess->LdtDescriptor.LimitLow != OldProcess->LdtDescriptor.LimitLow)
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{
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if (NewProcess->LdtDescriptor.LimitLow)
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{
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KeSetGdtSelector(KGDT_LDT,
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((PULONG)&NewProcess->LdtDescriptor)[0],
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((PULONG)&NewProcess->LdtDescriptor)[1]);
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Ke386SetLocalDescriptorTable(KGDT_LDT);
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}
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else
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{
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Ke386SetLocalDescriptorTable(0);
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}
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}
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/* Update CR3 */
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__writecr3(NewProcess->DirectoryTableBase[0]);
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/* Clear GS */
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Ke386SetGs(0);
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/* Update IOPM offset */
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Pcr->TSS->IoMapBase = NewProcess->IopmOffset;
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}
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