150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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thredini.c
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Abstract:
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This module implements the machine dependent function to set the initial
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context and data alignment handling mode for a process or thread object.
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Author:
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David N. Cutler (davec) 31-Mar-1990
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Environment:
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Kernel mode only.
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Revision History:
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3 April 90 bryan willman
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This version ported to 386.
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--*/
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#include "ki.h"
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VOID
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KiInitializeContextThread (
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IN PKTHREAD Thread,
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IN SIZE_T TlsDataSize,
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IN PKSYSTEM_ROUTINE SystemRoutine,
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IN PKSTART_ROUTINE StartRoutine OPTIONAL,
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IN PVOID StartContext OPTIONAL
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)
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/*++
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Routine Description:
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This function initializes the machine dependent context of a thread object.
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Arguments:
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Thread - Supplies a pointer to a dispatcher object of type thread.
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TlsDataSize - Supplies the number of bytes reserved from the kernel stack
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for thread local storage.
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SystemRoutine - Supplies a pointer to the system function that is to be
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called when the thread is first scheduled for execution.
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StartRoutine - Supplies an optional pointer to a function that is to be
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called after the system has finished initializing the thread. This
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parameter is specified if the thread is a system thread and will
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execute totally in kernel mode.
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StartContext - Supplies an optional pointer to an arbitrary data structure
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which will be passed to the StartRoutine as a parameter. This
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parameter is specified if the thread is a system thread and will
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execute totally in kernel mode.
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Return Value:
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None.
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--*/
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{
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PFX_SAVE_AREA NpxFrame;
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PVOID TlsData;
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PKSWITCHFRAME SwitchFrame;
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PULONG PSystemRoutine;
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PULONG PStartRoutine;
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PULONG PStartContext;
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//
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// Load up an initial NPX state.
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//
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NpxFrame = (PFX_SAVE_AREA)(((ULONG)(Thread->StackBase) -
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sizeof(FX_SAVE_AREA)));
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RtlZeroMemory((PVOID)NpxFrame, sizeof(FX_SAVE_AREA));
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NpxFrame->FloatSave.ControlWord = 0x27f; //like fpinit but 64bit mode
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NpxFrame->FloatSave.MXCsr = 0x1f80; // mask all the exceptions
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//
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// Thread's NPX state is not in the coprocessor.
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//
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Thread->NpxState = NPX_STATE_NOT_LOADED;
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//
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// Zero the thread local storage area.
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//
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TlsDataSize = ALIGN_UP(TlsDataSize, ULONG);
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TlsData = ((PUCHAR)(ULONG)NpxFrame) - TlsDataSize;
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if (TlsDataSize != 0) {
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Thread->TlsData = TlsData;
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RtlZeroMemory(TlsData, TlsDataSize);
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} else {
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Thread->TlsData = NULL;
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}
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//
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// Space for arguments to KiThreadStartup. Order of fields in the
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// switchframe is important, since args are passed on stack through
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// KiThreadStartup to PStartRoutine with PStartContext as an argument.
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//
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PStartContext = (PULONG)((ULONG)TlsData) - 1;
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PStartRoutine = PStartContext - 1;
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PSystemRoutine = PStartRoutine - 1;
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SwitchFrame = (PKSWITCHFRAME)((PUCHAR)PSystemRoutine - sizeof(KSWITCHFRAME));
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//
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// Set up thread start parameters.
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//
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*PStartContext = (ULONG)StartContext;
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*PStartRoutine = (ULONG)StartRoutine;
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*PSystemRoutine = (ULONG)SystemRoutine;
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//
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// Set up switch frame.
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//
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SwitchFrame->RetAddr = (ULONG)KiThreadStartup;
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SwitchFrame->Eflags = EFLAGS_INTERRUPT_MASK;
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SwitchFrame->ExceptionList = (ULONG)(EXCEPTION_CHAIN_END);
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//
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// Set the initial kernel stack pointer.
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//
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Thread->KernelStack = (PVOID)SwitchFrame;
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return;
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}
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