/*++
Copyright (c) 1993  Microsoft Corporation

Module Name:
    xxmpipi.c

Abstract:
    This module implements MIPS specific MP routine.

Author:
    David N. Cutler 24-Apr-1993

Environment:
    Kernel mode only.
--*/

#include "ki.h"


VOID KiRestoreProcessorState (IN PKTRAP_FRAME TrapFrame, IN PKEXCEPTION_FRAME ExceptionFrame)
/*++
Routine Description:
    This function moves processor register state from the current processor context structure in the processor block to the specified trap and exception frames.
Arguments:
    TrapFrame - Supplies a pointer to a trap frame.
    ExceptionFrame - Supplies a pointer to an exception frame.
--*/
{
    PKPRCB Prcb;

    // Get the address of the current processor block and move the specified register state from the processor context structure to the specified trap and exception frames
    Prcb = KeGetCurrentPrcb();
    KeContextToKframes(TrapFrame, ExceptionFrame, &Prcb->ProcessorState.ContextFrame, CONTEXT_FULL, KernelMode);
}


VOID KiSaveProcessorState (IN PKTRAP_FRAME TrapFrame, IN PKEXCEPTION_FRAME ExceptionFrame)
/*++
Routine Description:
    This function moves processor register state from the specified trap and exception frames to the processor context structure in the current processor block.
Arguments:
    TrapFrame - Supplies a pointer to a trap frame.
    ExceptionFrame - Supplies a pointer to an exception frame.
--*/
{
    PKPRCB Prcb;

    // Get the address of the current processor block and move the specified register state from specified trap and exception frames to the current processor context structure.
    Prcb = KeGetCurrentPrcb();
    Prcb->ProcessorState.ContextFrame.ContextFlags = CONTEXT_FULL;
    KeContextFromKframes(TrapFrame, ExceptionFrame, &Prcb->ProcessorState.ContextFrame);

    // Save the current processor control state.
    KiSaveProcessorControlState(&Prcb->ProcessorState);
}


VOID KiSaveProcessorControlState (IN PKPROCESSOR_STATE ProcessorState)
/*++
Routine Description:
    This routine saves the processor's control state for debugger.
Arguments:
    ProcessorState (a0) - Supplies a pointer to the processor state.
--*/
{
    ULONG Index;

    // Read Tb entries and store in the processor state structure.
    for (Index = 0; Index < KeNumberTbEntries; Index += 1) {
        KiReadEntryTb(Index, &ProcessorState->TbEntry[Index]);
    }
}


BOOLEAN KiIpiServiceRoutine (IN PKTRAP_FRAME TrapFrame, IN PKEXCEPTION_FRAME ExceptionFrame)
/*++
Routine Description:
    This function is called at IPI_LEVEL to process any outstanding interprocess request for the current processor.
Arguments:
    TrapFrame - Supplies a pointer to a trap frame.
    ExceptionFrame - Supplies a pointer to an exception frame
Return Value:
    A value of TRUE is returned, if one of more requests were service.
    Otherwise, FALSE is returned.
--*/
{
    ULONG RequestSummary;

    // Process any outstanding interprocessor requests.
    RequestSummary = KiIpiProcessRequests();

    // If freeze is requested, then freeze target execution.
    if ((RequestSummary & IPI_FREEZE) != 0) {
        KiFreezeTargetExecution(TrapFrame, ExceptionFrame);
    }

    // Return whether any requests were processed.
    return (RequestSummary & ~IPI_FREEZE) != 0;
}