144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/*
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* Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <errno.h>
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#include <ipxe/interface.h>
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#include <ipxe/blockdev.h>
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/** @file
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*
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* Block devices
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*
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*/
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/**
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* Read from block device
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*
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* @v control Control interface
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* @v data Data interface
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* @v lba Starting logical block address
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* @v count Number of logical blocks
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* @v buffer Data buffer
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* @v len Length of data buffer
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* @ret rc Return status code
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*/
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int block_read ( struct interface *control, struct interface *data,
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uint64_t lba, unsigned int count,
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userptr_t buffer, size_t len ) {
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struct interface *dest;
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block_read_TYPE ( void * ) *op =
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intf_get_dest_op ( control, block_read, &dest );
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void *object = intf_object ( dest );
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int rc;
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if ( op ) {
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rc = op ( object, data, lba, count, buffer, len );
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} else {
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/* Default is to fail to issue the command */
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rc = -EOPNOTSUPP;
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}
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intf_put ( dest );
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return rc;
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}
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/**
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* Write to block device
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*
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* @v control Control interface
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* @v data Data interface
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* @v lba Starting logical block address
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* @v count Number of logical blocks
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* @v buffer Data buffer
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* @v len Length of data buffer
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* @ret rc Return status code
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*/
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int block_write ( struct interface *control, struct interface *data,
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uint64_t lba, unsigned int count,
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userptr_t buffer, size_t len ) {
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struct interface *dest;
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block_write_TYPE ( void * ) *op =
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intf_get_dest_op ( control, block_write, &dest );
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void *object = intf_object ( dest );
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int rc;
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if ( op ) {
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rc = op ( object, data, lba, count, buffer, len );
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} else {
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/* Default is to fail to issue the command */
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rc = -EOPNOTSUPP;
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}
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intf_put ( dest );
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return rc;
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}
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/**
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* Read block device capacity
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*
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* @v control Control interface
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* @v data Data interface
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* @ret rc Return status code
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*/
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int block_read_capacity ( struct interface *control, struct interface *data ) {
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struct interface *dest;
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block_read_capacity_TYPE ( void * ) *op =
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intf_get_dest_op ( control, block_read_capacity, &dest );
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void *object = intf_object ( dest );
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int rc;
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if ( op ) {
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rc = op ( object, data );
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} else {
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/* Default is to fail to issue the command */
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rc = -EOPNOTSUPP;
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}
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intf_put ( dest );
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return rc;
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}
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/**
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* Report block device capacity
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*
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* @v intf Interface
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* @v capacity Block device capacity
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*/
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void block_capacity ( struct interface *intf,
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struct block_device_capacity *capacity ) {
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struct interface *dest;
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block_capacity_TYPE ( void * ) *op =
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intf_get_dest_op ( intf, block_capacity, &dest );
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void *object = intf_object ( dest );
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if ( op ) {
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op ( object, capacity );
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} else {
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/* Default is to do nothing */
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}
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intf_put ( dest );
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}
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