SUPLib-linux.cpp revision f7f5cd7b1e530eb5636da51c974b48ae0c1775b3
/* $Id$ */
/** @file
*/
/*
* 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;
* 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.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP LOG_GROUP_SUP
#ifdef IN_SUP_HARDENED_R3
# define LOG_DISABLED
/** @todo RTLOGREL_DISABLED */
#endif
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <malloc.h>
#include "../SUPLibInternal.h"
#include "../SUPDrvIOC.h"
/*******************************************************************************
* Defined Constants And Macros *
*******************************************************************************/
/** Unix Device name. */
#define DEVICE_NAME "/dev/vboxdrv"
/* define MADV_DONTFORK if it's missing from the system headers. */
#ifndef MADV_DONTFORK
# define MADV_DONTFORK 10
#endif
{
/*
* Nothing to do if pre-inited.
*/
if (fPreInited)
return VINF_SUCCESS;
/*
* Check if madvise works.
*/
if (pv == MAP_FAILED)
return VERR_NO_MEMORY;
/*
* Try open the device.
*/
if (hDevice < 0)
{
/*
* Try load the device.
*/
if (hDevice < 0)
{
int rc;
switch (errno)
{
case ENXIO: /* see man 2 open, ENODEV is actually a kernel bug */
case EPERM:
default: rc = VERR_VM_DRIVER_OPEN_ERROR; break;
}
return rc;
}
}
/*
* Mark the file handle close on exec.
*/
{
#ifdef IN_SUP_HARDENED_R3
return VERR_INTERNAL_ERROR;
#else
return RTErrConvertFromErrno(errno);
#endif
}
/*
* We're done.
*/
return VINF_SUCCESS;
}
#ifndef IN_SUP_HARDENED_R3
{
/*
* Close the device if it's actually open.
*/
{
AssertFailed();
}
return 0;
}
int suplibOsInstall(void)
{
// nothing to do on Linux
return VERR_NOT_IMPLEMENTED;
}
int suplibOsUninstall(void)
{
// nothing to do on Linux
return VERR_NOT_IMPLEMENTED;
}
{
/*
* Issue device iocontrol.
*/
return VINF_SUCCESS;
/* This is the reverse operation of the one found in SUPDrv-linux.c */
switch (errno)
{
case EACCES: return VERR_GENERAL_FAILURE;
case EINVAL: return VERR_INVALID_PARAMETER;
case EILSEQ: return VERR_INVALID_MAGIC;
case ENXIO: return VERR_INVALID_HANDLE;
case EFAULT: return VERR_INVALID_POINTER;
case ENOLCK: return VERR_LOCK_FAILED;
case EEXIST: return VERR_ALREADY_LOADED;
case EPERM: return VERR_PERMISSION_DENIED;
case ENOSYS: return VERR_VERSION_MISMATCH;
case 1000: return VERR_IDT_FAILED;
}
return RTErrConvertFromErrno(errno);
}
{
if (rc == -1)
return rc;
}
{
char *pvPages = (char *)mmap(NULL, cbMmap, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (pvPages == MAP_FAILED)
return VERR_NO_MEMORY;
if (pThis->fSysMadviseWorks)
{
/*
* It is not fatal if we fail here but a forked child (e.g. the ALSA sound server)
* could crash. Linux < 2.6.16 does not implement madvise(MADV_DONTFORK) but the
* kernel seems to split bigger VMAs and that is all that we want -- later we set the
* VM_DONTCOPY attribute in supdrvOSLockMemOne().
*/
}
else
{
/*
* madvise(MADV_DONTFORK) is not available (most probably Linux 2.4). Enclose any
* mmapped region by two unmapped pages to guarantee that there is exactly one VM
* area struct of the very same size as the mmap area.
*/
}
return VINF_SUCCESS;
}
{
return VINF_SUCCESS;
}
/** Check if the host kernel supports VT-x or not.
*
* Older Linux kernels clear the VMXE bit in the CR4 register (function
* tlb_flush_all()) leading to a host kernel panic.
*/
int suplibOsQueryVTxSupported(void)
{
char szBuf[256];
if (RT_SUCCESS(rc))
{
char *pszNext;
if ( RT_SUCCESS(rc)
&& *pszNext == '.')
{
/*
* new version number scheme starting with Linux 3.0
*/
if (uA >= 3)
return VINF_SUCCESS;
if ( RT_SUCCESS(rc)
&& *pszNext == '.')
{
if (RT_SUCCESS(rc))
{
return VINF_SUCCESS;
}
}
}
}
}
#endif /* !IN_SUP_HARDENED_R3 */