1 /*
2 * Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA.
18 *
19 * You can also choose to distribute this program under the terms of
20 * the Unmodified Binary Distribution Licence (as given in the file
21 * COPYING.UBDL), provided that you have satisfied its requirements.
22 */
23
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25
26 #include <errno.h>
27 #include <ipxe/interface.h>
28 #include <ipxe/blockdev.h>
29
30 /** @file
31 *
32 * Block devices
33 *
34 */
35
36 /**
37 * Read from block device
38 *
39 * @v control Control interface
40 * @v data Data interface
41 * @v lba Starting logical block address
42 * @v count Number of logical blocks
43 * @v buffer Data buffer
44 * @v len Length of data buffer
45 * @ret rc Return status code
46 */
block_read(struct interface * control,struct interface * data,uint64_t lba,unsigned int count,userptr_t buffer,size_t len)47 int block_read ( struct interface *control, struct interface *data,
48 uint64_t lba, unsigned int count,
49 userptr_t buffer, size_t len ) {
50 struct interface *dest;
51 block_read_TYPE ( void * ) *op =
52 intf_get_dest_op ( control, block_read, &dest );
53 void *object = intf_object ( dest );
54 int rc;
55
56 if ( op ) {
57 rc = op ( object, data, lba, count, buffer, len );
58 } else {
59 /* Default is to fail to issue the command */
60 rc = -EOPNOTSUPP;
61 }
62
63 intf_put ( dest );
64 return rc;
65 }
66
67 /**
68 * Write to block device
69 *
70 * @v control Control interface
71 * @v data Data interface
72 * @v lba Starting logical block address
73 * @v count Number of logical blocks
74 * @v buffer Data buffer
75 * @v len Length of data buffer
76 * @ret rc Return status code
77 */
block_write(struct interface * control,struct interface * data,uint64_t lba,unsigned int count,userptr_t buffer,size_t len)78 int block_write ( struct interface *control, struct interface *data,
79 uint64_t lba, unsigned int count,
80 userptr_t buffer, size_t len ) {
81 struct interface *dest;
82 block_write_TYPE ( void * ) *op =
83 intf_get_dest_op ( control, block_write, &dest );
84 void *object = intf_object ( dest );
85 int rc;
86
87 if ( op ) {
88 rc = op ( object, data, lba, count, buffer, len );
89 } else {
90 /* Default is to fail to issue the command */
91 rc = -EOPNOTSUPP;
92 }
93
94 intf_put ( dest );
95 return rc;
96 }
97
98 /**
99 * Read block device capacity
100 *
101 * @v control Control interface
102 * @v data Data interface
103 * @ret rc Return status code
104 */
block_read_capacity(struct interface * control,struct interface * data)105 int block_read_capacity ( struct interface *control, struct interface *data ) {
106 struct interface *dest;
107 block_read_capacity_TYPE ( void * ) *op =
108 intf_get_dest_op ( control, block_read_capacity, &dest );
109 void *object = intf_object ( dest );
110 int rc;
111
112 if ( op ) {
113 rc = op ( object, data );
114 } else {
115 /* Default is to fail to issue the command */
116 rc = -EOPNOTSUPP;
117 }
118
119 intf_put ( dest );
120 return rc;
121 }
122
123 /**
124 * Report block device capacity
125 *
126 * @v intf Interface
127 * @v capacity Block device capacity
128 */
block_capacity(struct interface * intf,struct block_device_capacity * capacity)129 void block_capacity ( struct interface *intf,
130 struct block_device_capacity *capacity ) {
131 struct interface *dest;
132 block_capacity_TYPE ( void * ) *op =
133 intf_get_dest_op ( intf, block_capacity, &dest );
134 void *object = intf_object ( dest );
135
136 if ( op ) {
137 op ( object, capacity );
138 } else {
139 /* Default is to do nothing */
140 }
141
142 intf_put ( dest );
143 }
144