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/* $Id$ */
/** @file
* MMRamGC - Guest Context Ram access Routines, pair for MMRamGCA.asm.
*/
/*
* 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_MM
#include <VBox/vmm/mm.h>
#include <VBox/vmm/cpum.h>
#include <VBox/vmm/trpm.h>
#include <VBox/vmm/em.h>
#include "MMInternal.h"
#include <VBox/vmm/vm.h>
#include <VBox/vmm/vmm.h>
#include <VBox/vmm/pgm.h>
#include <iprt/assert.h>
#include <VBox/param.h>
#include <VBox/err.h>
/*******************************************************************************
* Internal Functions *
*******************************************************************************/
static DECLCALLBACK(int) mmGCRamTrap0eHandler(PVM pVM, PCPUMCTXCORE pRegFrame);
DECLASM(void) MMGCRamReadNoTrapHandler_EndProc(void);
DECLASM(void) MMGCRamWriteNoTrapHandler_EndProc(void);
DECLASM(void) MMGCRamRead_Error(void);
DECLASM(void) MMGCRamWrite_Error(void);
/**
* Install MMGCRam Hypervisor page fault handler for normal working
* of MMGCRamRead and MMGCRamWrite calls.
* This handler will be automatically removed at page fault.
* In other case it must be removed by MMGCRamDeregisterTrapHandler call.
*
* @param pVM VM handle.
*/
VMMRCDECL(void) MMGCRamRegisterTrapHandler(PVM pVM)
{
TRPMGCSetTempHandler(pVM, 0xe, mmGCRamTrap0eHandler);
}
/**
* Remove MMGCRam Hypervisor page fault handler.
* See description of MMGCRamRegisterTrapHandler call.
*
* @param pVM VM handle.
*/
VMMRCDECL(void) MMGCRamDeregisterTrapHandler(PVM pVM)
{
TRPMGCSetTempHandler(pVM, 0xe, NULL);
}
/**
* Read data in guest context with #PF control.
*
* @returns VBox status.
* @param pVM The VM handle.
* @param pDst Where to store the read data.
* @param pSrc Pointer to the data to read.
* @param cb Size of data to read, only 1/2/4/8 is valid.
*/
VMMRCDECL(int) MMGCRamRead(PVM pVM, void *pDst, void *pSrc, size_t cb)
{
int rc;
PVMCPU pVCpu = VMMGetCpu0(pVM);
TRPMSaveTrap(pVCpu); /* save the current trap info, because it will get trashed if our access failed. */
MMGCRamRegisterTrapHandler(pVM);
rc = MMGCRamReadNoTrapHandler(pDst, pSrc, cb);
MMGCRamDeregisterTrapHandler(pVM);
if (RT_FAILURE(rc))
TRPMRestoreTrap(pVCpu);
return rc;
}
/**
* Write data in guest context with #PF control.
*
* @returns VBox status.
* @param pVM The VM handle.
* @param pDst Where to write the data.
* @param pSrc Pointer to the data to write.
* @param cb Size of data to write, only 1/2/4 is valid.
*
* @deprecated Don't use this as it doesn't check the page state.
*/
VMMRCDECL(int) MMGCRamWrite(PVM pVM, void *pDst, void *pSrc, size_t cb)
{
PVMCPU pVCpu = VMMGetCpu0(pVM);
TRPMSaveTrap(pVCpu); /* save the current trap info, because it will get trashed if our access failed. */
MMGCRamRegisterTrapHandler(pVM);
int rc = MMGCRamWriteNoTrapHandler(pDst, pSrc, cb);
MMGCRamDeregisterTrapHandler(pVM);
if (RT_FAILURE(rc))
TRPMRestoreTrap(pVCpu);
/*
* And mark the relevant guest page as accessed and dirty.
*/
PGMGstModifyPage(VMMGetCpu0(pVM), (RTGCPTR)(RTRCUINTPTR)pDst, cb, X86_PTE_A | X86_PTE_D, ~(uint64_t)(X86_PTE_A | X86_PTE_D));
return rc;
}
/**
* \#PF Handler for servicing traps inside MMGCRamReadNoTrapHandler and MMGCRamWriteNoTrapHandler functions.
*
* @internal
*/
DECLCALLBACK(int) mmGCRamTrap0eHandler(PVM pVM, PCPUMCTXCORE pRegFrame)
{
/*
* Page fault inside MMGCRamRead()? Resume at *_Error.
*/
if ( (uintptr_t)&MMGCRamReadNoTrapHandler < (uintptr_t)pRegFrame->eip
&& (uintptr_t)pRegFrame->eip < (uintptr_t)&MMGCRamReadNoTrapHandler_EndProc)
{
/* Must be a read violation. */
AssertReturn(!(TRPMGetErrorCode(VMMGetCpu0(pVM)) & X86_TRAP_PF_RW), VERR_INTERNAL_ERROR);
pRegFrame->eip = (uintptr_t)&MMGCRamRead_Error;
return VINF_SUCCESS;
}
/*
* Page fault inside MMGCRamWrite()? Resume at _Error.
*/
if ( (uintptr_t)&MMGCRamWriteNoTrapHandler < (uintptr_t)pRegFrame->eip
&& (uintptr_t)pRegFrame->eip < (uintptr_t)&MMGCRamWriteNoTrapHandler_EndProc)
{
/* Must be a write violation. */
AssertReturn(TRPMGetErrorCode(VMMGetCpu0(pVM)) & X86_TRAP_PF_RW, VERR_INTERNAL_ERROR);
pRegFrame->eip = (uintptr_t)&MMGCRamWrite_Error;
return VINF_SUCCESS;
}
/*
* #PF is not handled - cause guru meditation.
*/
return VERR_INTERNAL_ERROR;
}
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