/* $Id: IOMGC.cpp 28800 2010-04-27 08:22:32Z vboxsync $ */
/** @file
 * IOM - Input / Output Monitor - Guest Context.
 */

/*
 * Copyright (C) 2006-2007 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 */


/*******************************************************************************
*   Header Files                                                               *
*******************************************************************************/
#define LOG_GROUP LOG_GROUP_IOM
#include <VBox/iom.h>
#include <VBox/cpum.h>
#include <VBox/pgm.h>
#include <VBox/selm.h>
#include <VBox/mm.h>
#include <VBox/em.h>
#include <VBox/pgm.h>
#include <VBox/trpm.h>
#include "IOMInternal.h"
#include <VBox/vm.h>

#include <VBox/dis.h>
#include <VBox/disopcode.h>
#include <VBox/param.h>
#include <VBox/err.h>
#include <iprt/assert.h>
#include <VBox/log.h>
#include <iprt/asm.h>
#include <iprt/string.h>



/**
 * Attempts to service an IN/OUT instruction.
 *
 * The \#GP trap handler in GC will call this function if the opcode causing the
 * trap is a in or out type instruction. (Call it indirectly via EM that is.)
 *
 * @returns Strict VBox status code. Informational status codes other than the one documented
 *          here are to be treated as internal failure. Use IOM_SUCCESS() to check for success.
 * @retval  VINF_SUCCESS                Success.
 * @retval  VINF_EM_FIRST-VINF_EM_LAST  Success with some exceptions (see IOM_SUCCESS()), the
 *                                      status code must be passed on to EM.
 * @retval  VINF_EM_RESCHEDULE_REM      The exception was dispatched and cannot be executed in raw-mode. (TRPMRaiseXcptErr)
 * @retval  VINF_EM_RAW_EMULATE_INSTR   Defer the read to the REM.
 * @retval  VINF_IOM_HC_IOPORT_READ     Defer the read to ring-3. (R0/GC only)
 * @retval  VINF_EM_RAW_GUEST_TRAP      The exception was left pending. (TRPMRaiseXcptErr)
 * @retval  VINF_TRPM_XCPT_DISPATCHED   The exception was raised and dispatched for raw-mode execution. (TRPMRaiseXcptErr)
 *
 * @param   pVM         The virtual machine (GC pointer ofcourse).
 * @param   pRegFrame   Pointer to CPUMCTXCORE guest registers structure.
 * @param   pCpu        Disassembler CPU state.
 */
VMMRCDECL(VBOXSTRICTRC) IOMGCIOPortHandler(PVM pVM, PCPUMCTXCORE pRegFrame, PDISCPUSTATE pCpu)
{
    switch (pCpu->pCurInstr->opcode)
    {
        case OP_IN:
            return IOMInterpretIN(pVM, pRegFrame, pCpu);

        case OP_OUT:
            return IOMInterpretOUT(pVM, pRegFrame, pCpu);

        case OP_INSB:
        case OP_INSWD:
            return IOMInterpretINS(pVM, pRegFrame, pCpu);

        case OP_OUTSB:
        case OP_OUTSWD:
            return IOMInterpretOUTS(pVM, pRegFrame, pCpu);

        /*
         * The opcode wasn't know to us, freak out.
         */
        default:
            AssertMsgFailed(("Unknown I/O port access opcode %d.\n", pCpu->pCurInstr->opcode));
            return VERR_INTERNAL_ERROR;
    }
}