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|
//==========================================================================
//
// devfs.cxx
//
// Fileio device filesystem
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
//
// eCos is free software; 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 or (at your option) any later
// version.
//
// eCos 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.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): nickg
// Contributors: nickg, gthomas
// Date: 2000-05-25
// Purpose: Fileio device filesystem
// Description: This file implements a simple filesystem that interfaces
// to the existing device IO subsystem.
//
//
//
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include <pkgconf/hal.h>
#include <pkgconf/io_fileio.h>
#include <cyg/infra/cyg_trac.h> // tracing macros
#include <cyg/infra/cyg_ass.h> // assertion macros
#include "fio.h" // Private header
#include <cyg/io/devtab.h> // device subsystem
#include <cyg/io/config_keys.h> // CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN
//==========================================================================
// Forward definitions
// Filesystem operations
static int dev_mount ( cyg_fstab_entry *fste, cyg_mtab_entry *mte );
static int dev_umount ( cyg_mtab_entry *mte );
static int dev_open ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
int mode, cyg_file *fte );
static int dev_unlink ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
static int dev_mkdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
static int dev_rmdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
static int dev_rename ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
cyg_dir dir2, const char *name2 );
static int dev_link ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
cyg_dir dir2, const char *name2, int type );
static int dev_opendir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
cyg_file *fte );
static int dev_chdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
cyg_dir *dir_out );
static int dev_stat ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
struct stat *buf);
static int dev_getinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
int key, void *buf, int len );
static int dev_setinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
int key, void *buf, int len );
// File operations
static int dev_fo_read (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
static int dev_fo_write (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
static int dev_fo_lseek (struct CYG_FILE_TAG *fp, off_t *pos, int whence );
static int dev_fo_ioctl (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
CYG_ADDRWORD data);
static cyg_bool dev_fo_select (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info);
static int dev_fo_fsync (struct CYG_FILE_TAG *fp, int mode );
static int dev_fo_close (struct CYG_FILE_TAG *fp);
static int dev_fo_fstat (struct CYG_FILE_TAG *fp, struct stat *buf );
static int dev_fo_getinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len );
static int dev_fo_setinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len );
//==========================================================================
// Filesystem table entries
FSTAB_ENTRY( dev_fste, "devfs", 0,
CYG_SYNCMODE_NONE, // dev system has its own sync mechanism
dev_mount,
dev_umount,
dev_open,
dev_unlink,
dev_mkdir,
dev_rmdir,
dev_rename,
dev_link,
dev_opendir,
dev_chdir,
dev_stat,
dev_getinfo,
dev_setinfo);
MTAB_ENTRY( dev_mte,
"/dev",
"devfs",
"",
0);
static cyg_fileops dev_fileops =
{
dev_fo_read,
dev_fo_write,
dev_fo_lseek,
dev_fo_ioctl,
dev_fo_select,
dev_fo_fsync,
dev_fo_close,
dev_fo_fstat,
dev_fo_getinfo,
dev_fo_setinfo
};
//==========================================================================
// Filesystem operations
// -------------------------------------------------------------------------
static int dev_mount ( cyg_fstab_entry *fste, cyg_mtab_entry *mte )
{
// Nothing to do here. The device IO subsystem has already initialized
// iteslf, and the fileio infrastructure will do the rest.
return 0;
}
// -------------------------------------------------------------------------
static int dev_umount ( cyg_mtab_entry *mte )
{
// Nothing to do here.
return 0;
}
// -------------------------------------------------------------------------
static int dev_open ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
int mode, cyg_file *file )
{
Cyg_ErrNo err;
cyg_io_handle_t handle;
// The name we are passed will point to the first character after
// "/dev/". We know that the full string contains the prefix string,
// so we back the pointer up by 5 chars.
// A better approach would be for the device table entries to only
// contain the part of the string after the prefix.
name -= 5;
err = cyg_io_lookup( name, &handle );
if( err < 0 )
return -err;
// If we want non-blocking mode, configure the device for it.
if( (mode & (O_NONBLOCK|O_RDONLY)) == (O_NONBLOCK|O_RDONLY) )
{
cyg_uint32 f = 0;
cyg_uint32 fsize = sizeof(f);
err = cyg_io_set_config( handle, CYG_IO_SET_CONFIG_READ_BLOCKING,
(void *)&f, &fsize);
if( err < 0 )
return -err;
}
if( (mode & (O_NONBLOCK|O_WRONLY)) == (O_NONBLOCK|O_WRONLY) )
{
cyg_uint32 f = 0;
cyg_uint32 fsize = sizeof(f);
err = cyg_io_set_config( handle, CYG_IO_SET_CONFIG_WRITE_BLOCKING,
(void *)&f, &fsize);
if( err < 0 )
return -err;
}
// Initialize the file object
file->f_flag |= mode & CYG_FILE_MODE_MASK;
file->f_type = CYG_FILE_TYPE_FILE;
file->f_ops = &dev_fileops;
file->f_offset = 0;
file->f_data = (CYG_ADDRWORD)handle;
file->f_xops = 0;
return 0;
}
// -------------------------------------------------------------------------
static int dev_unlink ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )
{
return EROFS;
}
// -------------------------------------------------------------------------
static int dev_mkdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )
{
return EROFS;
}
// -------------------------------------------------------------------------
static int dev_rmdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )
{
return EROFS;
}
// -------------------------------------------------------------------------
static int dev_rename ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
cyg_dir dir2, const char *name2 )
{
return EROFS;
}
// -------------------------------------------------------------------------
static int dev_link ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
cyg_dir dir2, const char *name2, int type )
{
return EROFS;
}
// -------------------------------------------------------------------------
static int dev_opendir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
cyg_file *fte )
{
return ENOTDIR;
}
// -------------------------------------------------------------------------
static int dev_chdir ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
cyg_dir *dir_out )
{
return ENOTDIR;
}
// -------------------------------------------------------------------------
static int dev_stat ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
struct stat *buf)
{
Cyg_ErrNo err;
cyg_io_handle_t handle;
cyg_devtab_entry_t *dev;
name -= 5; // See comment in dev_open()
err = cyg_io_lookup( name, &handle );
if( err < 0 )
return -err;
// Just fill in the stat buffer with some constant values.
dev = (cyg_devtab_entry_t *)handle;
if (dev->status & CYG_DEVTAB_STATUS_BLOCK)
buf->st_mode = __stat_mode_BLK;
else
buf->st_mode = __stat_mode_CHR;
buf->st_ino = (ino_t)handle; // map dev handle to inode
buf->st_dev = 0; // (dev_t)handle; // same with dev id
buf->st_nlink = 1;
buf->st_uid = 0;
buf->st_gid = 0;
buf->st_size = 0;
buf->st_atime = 0;
buf->st_mtime = 0;
buf->st_ctime = 0;
return ENOERR;
}
// -------------------------------------------------------------------------
static int dev_getinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
int key, void *buf, int len )
{
return ENOSYS;
}
// -------------------------------------------------------------------------
static int dev_setinfo ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
int key, void *buf, int len )
{
return ENOSYS;
}
//==========================================================================
// File operations
// -------------------------------------------------------------------------
static int dev_fo_read (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)
{
Cyg_ErrNo err = 0;
int i;
// Now loop over the iovecs until they are all done, or
// we get an error.
for( i = 0; i < uio->uio_iovcnt; i++ )
{
cyg_iovec *iov = &uio->uio_iov[i];
cyg_uint32 len = iov->iov_len;
cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)fp->f_data;
if (t->status & CYG_DEVTAB_STATUS_BLOCK)
err = cyg_io_bread( (cyg_io_handle_t)t,
iov->iov_base,
&len, fp->f_offset);
else
err = cyg_io_read( (cyg_io_handle_t)t,
iov->iov_base,
&len);
if( err < 0 ) break;
uio->uio_resid -= len;
}
return -err;
}
// -------------------------------------------------------------------------
static int dev_fo_write (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)
{
Cyg_ErrNo err = 0;
int i;
// Now loop over the iovecs until they are all done, or
// we get an error.
for( i = 0; i < uio->uio_iovcnt; i++ )
{
cyg_iovec *iov = &uio->uio_iov[i];
cyg_uint32 len = iov->iov_len;
cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)fp->f_data;
if (t->status & CYG_DEVTAB_STATUS_BLOCK)
err = cyg_io_bwrite( (cyg_io_handle_t)t,
iov->iov_base,
&len, fp->f_offset);
else
err = cyg_io_write( (cyg_io_handle_t)t,
iov->iov_base,
&len);
if( err < 0 ) break;
uio->uio_resid -= len;
}
return -err;
}
// -------------------------------------------------------------------------
static int dev_fo_lseek (struct CYG_FILE_TAG *fp, off_t *pos, int whence )
{
// All current devices have no notion of position. Just return zero
// as the new position.
*pos = 0;
return ENOERR;
}
// -------------------------------------------------------------------------
static int dev_fo_ioctl (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
CYG_ADDRWORD data)
{
return ENOSYS;
}
// -------------------------------------------------------------------------
static cyg_bool dev_fo_select (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info)
{
return cyg_io_select( (cyg_io_handle_t)fp->f_data,
which,
info);
}
// -------------------------------------------------------------------------
static int dev_fo_fsync (struct CYG_FILE_TAG *fp, int mode )
{
Cyg_ErrNo err;
err = cyg_io_get_config((cyg_io_handle_t)fp->f_data,
CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN,
NULL, NULL);
return -err;
}
// -------------------------------------------------------------------------
static int dev_fo_close (struct CYG_FILE_TAG *fp)
{
return ENOERR;
}
// -------------------------------------------------------------------------
static int dev_fo_fstat (struct CYG_FILE_TAG *fp, struct stat *buf )
{
cyg_devtab_entry_t *dev = (cyg_devtab_entry_t *)fp->f_data;
// Just fill in the stat buffer with some constant values.
if (dev->status & CYG_DEVTAB_STATUS_BLOCK)
buf->st_mode = __stat_mode_BLK;
else
buf->st_mode = __stat_mode_CHR;
buf->st_ino = (ino_t)fp->f_data; // map dev handle to inode
buf->st_dev = 0; //(dev_t)fp->f_data; // same with dev id
buf->st_nlink = 1;
buf->st_uid = 0;
buf->st_gid = 0;
buf->st_size = 0;
buf->st_atime = 0;
buf->st_mtime = 0;
buf->st_ctime = 0;
return ENOERR;
}
// -------------------------------------------------------------------------
static int dev_fo_getinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len )
{
Cyg_ErrNo err = 0;
cyg_uint32 ll = len;
err = cyg_io_get_config( (cyg_io_handle_t)fp->f_data, key, buf, &ll );
return -err;
}
// -------------------------------------------------------------------------
static int dev_fo_setinfo (struct CYG_FILE_TAG *fp, int key, void *buf, int len )
{
Cyg_ErrNo err = 0;
cyg_uint32 ll = len;
err = cyg_io_set_config( (cyg_io_handle_t)fp->f_data, key, buf, &ll );
return -err;
}
// -------------------------------------------------------------------------
// EOF devfs.cxx
|
