mirror of
https://github.com/reactos/reactos.git
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134 lines
3.6 KiB
C
134 lines
3.6 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/arm/thrdini.c
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* PURPOSE: Implements thread context setup and startup for ARM machines
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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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typedef struct _KUINIT_FRAME
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{
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KEXCEPTION_FRAME CtxSwitchFrame;
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KEXCEPTION_FRAME ExceptionFrame;
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KTRAP_FRAME TrapFrame;
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} KUINIT_FRAME, *PKUINIT_FRAME;
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typedef struct _KKINIT_FRAME
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{
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KEXCEPTION_FRAME CtxSwitchFrame;
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} KKINIT_FRAME, *PKKINIT_FRAME;
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/* FUNCTIONS ******************************************************************/
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VOID
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NTAPI
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KiThreadStartup(VOID);
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VOID
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NTAPI
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KiInitializeContextThread(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 ContextPointer)
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{
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PKTRAP_FRAME TrapFrame;
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PKEXCEPTION_FRAME ExceptionFrame = NULL, CtxSwitchFrame;
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//
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// Check if this is a user thread
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//
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if (ContextPointer)
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{
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//
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// Setup the initial frame
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//
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PKUINIT_FRAME InitFrame;
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InitFrame = (PKUINIT_FRAME)((ULONG_PTR)Thread->InitialStack -
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sizeof(KUINIT_FRAME));
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//
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// Setup the Trap Frame and Exception frame
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//
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TrapFrame = &InitFrame->TrapFrame;
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ExceptionFrame = &InitFrame->ExceptionFrame;
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///
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// Zero out the trap frame and exception frame
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//
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RtlZeroMemory(TrapFrame, sizeof(KTRAP_FRAME));
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RtlZeroMemory(ExceptionFrame, sizeof(KEXCEPTION_FRAME));
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//
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// Set up a trap frame from the context
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//
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KeContextToTrapFrame(ContextPointer,
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ExceptionFrame,
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TrapFrame,
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ContextPointer->ContextFlags | CONTEXT_CONTROL,
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UserMode);
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//
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// Set the previous mode as user
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//
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//TrapFrame->PreviousMode = UserMode;
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Thread->PreviousMode = UserMode;
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//
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// Clear the return address
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//
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ExceptionFrame->Lr = 0;
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//
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// Context switch frame to setup below
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//
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CtxSwitchFrame = &InitFrame->CtxSwitchFrame;
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}
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else
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{
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//
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// Set up the Initial Frame for the system thread
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//
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PKKINIT_FRAME InitFrame;
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InitFrame = (PKKINIT_FRAME)((ULONG_PTR)Thread->InitialStack -
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sizeof(KKINIT_FRAME));
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//
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// Set the previous mode as kernel
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//
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Thread->PreviousMode = KernelMode;
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//
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// Context switch frame to setup below
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//
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CtxSwitchFrame = &InitFrame->CtxSwitchFrame;
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}
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//
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// Now setup the context switch frame
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//
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CtxSwitchFrame->Lr = (ULONG)KiThreadStartup;
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CtxSwitchFrame->R11 = (ULONG)(ExceptionFrame ? ExceptionFrame : CtxSwitchFrame);
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//
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// Set the parameters
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//
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CtxSwitchFrame->R4 = (ULONG)ContextPointer;
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CtxSwitchFrame->R5 = (ULONG)StartContext;
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CtxSwitchFrame->R6 = (ULONG)StartRoutine;
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CtxSwitchFrame->R7 = (ULONG)SystemRoutine;
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//
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// Save back the new value of the kernel stack
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//
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Thread->KernelStack = (PVOID)CtxSwitchFrame;
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}
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