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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim:expandtab:autoindent:tabstop=4:shiftwidth=4:filetype=c:cindent:textwidth=0:
*
* Copyright (C) 2005 Dell Inc.
* by Michael Brown <Michael_E_Brown@dell.com>
* Licensed under the Open Software License version 2.1
*
* Alternatively, you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*/
// compat header should always be first header if including system headers
#define LIBSMBIOS_SOURCE
#include "smbios/compat.h"
#include <errno.h>
#include <sys/mman.h> /* mmap */
#include <unistd.h> /* getpagesize */
#include <string.h> /* memcpy etc. */
#include "MemoryImpl.h"
// include this last
#include "smbios/message.h"
using namespace std;
using namespace factory;
namespace memory
{
struct LinuxData
{
FILE *fd;
void *lastMapping;
unsigned long lastMappedOffset;
unsigned long mappingSize;
int reopenHint;
string filename;
};
static void condOpenFd(struct LinuxData *data)
{
if(!data->fd)
{
data->lastMapping = 0;
data->lastMappedOffset = 0;
data->fd = fopen( data->filename.c_str(), "rb" );
if(!data->fd)
{
AccessErrorImpl accessError;
accessError.setMessageString( _("Unable to open memory. File: %(file)s, OS Error: %(err)s") );
accessError.setParameter( "file", data->filename );
accessError.setParameter( "err", strerror(errno) );
throw accessError;
}
}
}
static void closeFd(struct LinuxData *data)
{
if(data->lastMapping)
{
munmap(data->lastMapping, data->mappingSize);
data->lastMapping = 0;
}
if (data->fd)
{
fclose(data->fd);
data->fd = 0;
}
data->lastMappedOffset = 0;
}
MemoryFactoryImpl::MemoryFactoryImpl()
{
setParameter("memFile", "/dev/mem");
}
MemoryOsSpecific::MemoryOsSpecific( const string filename )
: IMemory()
{
LinuxData *data = new LinuxData();
data->fd = 0;
data->filename = filename;
data->mappingSize = getpagesize() * 16;
data->reopenHint = 1;
condOpenFd(data);
closeFd(data);
osData = static_cast<void *>(data);
}
MemoryOsSpecific::~MemoryOsSpecific()
{
LinuxData *data = static_cast<LinuxData *>(osData);
closeFd(data);
delete data;
osData = 0;
}
int MemoryOsSpecific::incReopenHint()
{
LinuxData *data = static_cast<LinuxData *>(osData);
return ++(data->reopenHint);
}
int MemoryOsSpecific::decReopenHint()
{
LinuxData *data = static_cast<LinuxData *>(osData);
return --(data->reopenHint);
}
void MemoryOsSpecific::fillBuffer( u8 *buffer, u64 offset, unsigned int length) const
{
LinuxData *data = static_cast<LinuxData *>(osData);
unsigned int bytesCopied = 0;
condOpenFd(data);
while( bytesCopied < length )
{
off_t mmoff = offset % data->mappingSize;
if ((offset-mmoff) != data->lastMappedOffset)
{
data->lastMappedOffset = offset-mmoff;
if (data->lastMapping)
munmap(data->lastMapping, data->mappingSize);
data->lastMapping = mmap( 0, data->mappingSize, PROT_READ, MAP_PRIVATE, fileno(data->fd), offset-mmoff);
if ((data->lastMapping) == reinterpret_cast<void *>(-1))
throw AccessErrorImpl(_("mmap failed."));
}
unsigned long toCopy = length - bytesCopied;
if( toCopy + mmoff > (data->mappingSize) )
toCopy = (data->mappingSize) - mmoff;
memcpy(buffer + bytesCopied, (reinterpret_cast<const u8 *>(data->lastMapping) + mmoff), toCopy);
offset += toCopy;
bytesCopied += toCopy;
}
if(data->reopenHint)
closeFd(data);
}
u8 MemoryOsSpecific::getByte( u64 offset ) const
{
u8 value=0;
fillBuffer( &value, offset, 1 );
return value;
}
void MemoryOsSpecific::putByte( u64 offset, u8 value ) const
{
LinuxData *data = static_cast<LinuxData *>(osData);
condOpenFd(data);
int ret = fseek( data->fd, offset, 0 );
if( 0 != ret )
{
OutOfBoundsImpl outOfBounds;
outOfBounds.setMessageString(_("Seek error trying to seek to memory location. OS Error: %(err)s"));
outOfBounds.setParameter("err", strerror(errno) );
closeFd(data);
throw outOfBounds;
}
ret = fwrite( &value, 1, 1, data->fd );
if( 1 != ret )
{
AccessErrorImpl accessError;
accessError.setMessageString(_("Error trying to write memory. OS Error: %(err)s"));
accessError.setParameter("err", strerror(errno) );
closeFd(data);
throw accessError;
}
if(data->reopenHint)
closeFd(data);
}
}
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