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/*
* Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program 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 of the
* License, or 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <errno.h>
#include <ipxe/interface.h>
#include <ipxe/blockdev.h>
/** @file
*
* Block devices
*
*/
/**
* Read from block device
*
* @v control Control interface
* @v data Data interface
* @v lba Starting logical block address
* @v count Number of logical blocks
* @v buffer Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*/
int block_read ( struct interface *control, struct interface *data,
uint64_t lba, unsigned int count,
userptr_t buffer, size_t len ) {
struct interface *dest;
block_read_TYPE ( void * ) *op =
intf_get_dest_op ( control, block_read, &dest );
void *object = intf_object ( dest );
int rc;
if ( op ) {
rc = op ( object, data, lba, count, buffer, len );
} else {
/* Default is to fail to issue the command */
rc = -EOPNOTSUPP;
}
intf_put ( dest );
return rc;
}
/**
* Write to block device
*
* @v control Control interface
* @v data Data interface
* @v lba Starting logical block address
* @v count Number of logical blocks
* @v buffer Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*/
int block_write ( struct interface *control, struct interface *data,
uint64_t lba, unsigned int count,
userptr_t buffer, size_t len ) {
struct interface *dest;
block_write_TYPE ( void * ) *op =
intf_get_dest_op ( control, block_write, &dest );
void *object = intf_object ( dest );
int rc;
if ( op ) {
rc = op ( object, data, lba, count, buffer, len );
} else {
/* Default is to fail to issue the command */
rc = -EOPNOTSUPP;
}
intf_put ( dest );
return rc;
}
/**
* Read block device capacity
*
* @v control Control interface
* @v data Data interface
* @ret rc Return status code
*/
int block_read_capacity ( struct interface *control, struct interface *data ) {
struct interface *dest;
block_read_capacity_TYPE ( void * ) *op =
intf_get_dest_op ( control, block_read_capacity, &dest );
void *object = intf_object ( dest );
int rc;
if ( op ) {
rc = op ( object, data );
} else {
/* Default is to fail to issue the command */
rc = -EOPNOTSUPP;
}
intf_put ( dest );
return rc;
}
/**
* Report block device capacity
*
* @v intf Interface
* @v capacity Block device capacity
*/
void block_capacity ( struct interface *intf,
struct block_device_capacity *capacity ) {
struct interface *dest;
block_capacity_TYPE ( void * ) *op =
intf_get_dest_op ( intf, block_capacity, &dest );
void *object = intf_object ( dest );
if ( op ) {
op ( object, capacity );
} else {
/* Default is to do nothing */
}
intf_put ( dest );
}
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