reactos/ntoskrnl/ke/i386/context.c

59 lines
1.6 KiB
C

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