117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/ke/i686/kthread.c
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* DESCRIPTION: I686 thread manipulation support
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include <xtos.h>
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/**
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* Initializes CPU architecture dependent context of a thread.
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*
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* @param Thread
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* Supplies a pointer to the thread being initialized.
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*
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* @param SystemRoutine
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* Supplies a pointer to the routine called during first scheduling.
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*
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* @param StartRoutine
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* Supplies a pointer to the routine called during thread startup.
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*
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* @param StartContext
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* Supplies a pointer to a context data that will be passed to start routine.
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*
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* @param ContextRecord
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* Supplies a pointer to a context record which stores the initial state of the user mode thread.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTAPI
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VOID
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KepInitializeThreadContext(IN PKTHREAD Thread,
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IN PKSYSTEM_ROUTINE SystemRoutine,
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IN PKSTART_ROUTINE StartRoutine,
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IN PVOID StartContext,
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IN PCONTEXT ContextRecord)
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{
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PKTHREAD_INIT_FRAME ThreadFrame;
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PSIMD_SAVE_AREA SimdSaveArea;
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/* Set initial thread frame */
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ThreadFrame = (PKTHREAD_INIT_FRAME)Thread->InitialStack - sizeof(KTHREAD_INIT_FRAME);
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/* Fill floating point save area with zeroes */
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RtlZeroMemory(&ThreadFrame->NpxFrame, sizeof(FLOATING_SAVE_AREA));
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/* Check if context provided for this thread */
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if(ContextRecord)
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{
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/* Fill trap frame with zeroes */
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RtlZeroMemory(&ThreadFrame->TrapFrame, sizeof(KTRAP_FRAME));
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/* Disable debug registers and enable context registers */
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ContextRecord->ContextFlags &= ~CONTEXT_DEBUG_REGISTERS | CONTEXT_CONTROL;
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/* This is user mode thread */
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Thread->PreviousMode = UserMode;
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/* Disable coprocessor floating point state */
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Thread->NpxState = CR0_TS | CR0_MP;
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Thread->Header.NpxIrql = PASSIVE_LEVEL;
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/* Set initial floating point state */
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ThreadFrame->NpxFrame.Cr0NpxState = 0;
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ThreadFrame->NpxFrame.NpxSavedCpu = 0;
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SimdSaveArea = (PSIMD_SAVE_AREA)ContextRecord->ExtendedRegisters;
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SimdSaveArea->ControlWord = 0x27F;
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SimdSaveArea->MxCsr = 0x1F80;
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ContextRecord->FloatSave.Cr0NpxState = 0;
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/* Clear DR6 and DR7 registers */
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ThreadFrame->TrapFrame.Dr6 = 0;
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ThreadFrame->TrapFrame.Dr7 = 0;
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/* Set exception list pointer in the trap frame */
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ThreadFrame->TrapFrame.ExceptionList = (PEXCEPTION_REGISTRATION_RECORD) - 1;
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/* Set DS, ES and SS segments for user mode */
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ThreadFrame->TrapFrame.SegDs |= RPL_MASK;
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ThreadFrame->TrapFrame.SegEs |= RPL_MASK;
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ThreadFrame->TrapFrame.HardwareSegSs |= RPL_MASK;
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/* Set kernel mode thread in the trap frame */
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ThreadFrame->TrapFrame.PreviousMode = UserMode;
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}
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else
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{
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/* This is kernel mode thread */
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Thread->PreviousMode = KernelMode;
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/* Disable coprocessor floating point state */
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Thread->NpxState = CR0_TS | CR0_MP;
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/* Set initial floating point state */
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ThreadFrame->NpxFrame.FxArea.ControlWord = 0x27F;
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ThreadFrame->NpxFrame.FxArea.MxCsr = 0x1F80;
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/* Mark as kernel mode thread in the start frame */
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ThreadFrame->StartFrame.UserMode = FALSE;
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}
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/* Initialize thread startup information */
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ThreadFrame->StartFrame.StartContext = StartContext;
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ThreadFrame->StartFrame.StartRoutine = StartRoutine;
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ThreadFrame->StartFrame.SystemRoutine = SystemRoutine;
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/* Initialize switch frame */
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ThreadFrame->SwitchFrame.ExceptionList = (PEXCEPTION_REGISTRATION_RECORD) - 1;
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/* Set thread stack */
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Thread->KernelStack = &ThreadFrame->SwitchFrame;
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}
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