1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2012 secunet Security Networks AG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <libpayload.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <storage/ata.h>
/** Reads non-sector-aligned blocks of 512 bytes. */
static ssize_t ata_read_unaligned(ata_dev_t *const dev,
const lba_t blk_start, size_t blk_count,
u8 *blk_buf)
{
ssize_t ret = 0;
lba_t sec_start;
size_t blk_residue;
u8 *const sec_buf = malloc(dev->sector_size);
if (sec_buf == NULL)
return -1;
const size_t shift = dev->sector_size_shift - 9;
const size_t mask = (dev->sector_size >> 9) - 1;
/* Sector aligned start block. */
const lba_t blk_aligned = blk_start & ~mask;
/* First sector to read from. */
sec_start = blk_aligned >> shift;
/* Calculate and read residue before sector aligned blocks. */
blk_residue = MIN(blk_start - blk_aligned, blk_count);
if (blk_residue) {
if (dev->read_sectors(dev, sec_start, 1, sec_buf) != 1)
goto _free_ret;
const size_t bytes = blk_residue << 9;
memcpy(blk_buf, sec_buf + (dev->sector_size - bytes), bytes);
blk_count -= blk_residue;
blk_buf += bytes;
++sec_start;
ret = blk_residue;
if (blk_count == 0)
goto _free_ret;
}
/* Read all sector aligned blocks. */
const size_t sec_count = (blk_count & ~mask) >> shift;
const int sec_read = dev->read_sectors(
dev, sec_start, sec_count, blk_buf);
if (sec_read < 0)
goto _free_ret;
ret += sec_read << shift;
if (sec_read != sec_count)
goto _free_ret;
/* Calculate and read residue. */
blk_residue = blk_count & mask;
if (blk_residue) {
sec_start += sec_read;
blk_buf += sec_read << dev->sector_size_shift;
if (dev->read_sectors(dev, sec_start, 1, sec_buf) != 1)
goto _free_ret;
const size_t bytes = blk_residue << 9;
memcpy(blk_buf, sec_buf, bytes);
ret += blk_residue;
}
_free_ret:
free(sec_buf);
return ret;
}
static ssize_t ata_read512(storage_dev_t *_dev,
const lba_t start, const size_t count,
unsigned char *const buf)
{
ata_dev_t *const dev = (ata_dev_t *)_dev;
if (dev->read_sectors == NULL) {
printf("ata: No read support implemented.\n");
return -1;
}
if (dev->sector_size == 512) {
return dev->read_sectors(dev, start, count, buf);
} else if (dev->sector_size > 512) {
/* Sector size has to be a power of two. */
const size_t mask = (dev->sector_size >> 9) - 1;
if (!(start & mask) && !(count & mask)) {
const size_t shift = dev->sector_size_shift - 9;
const ssize_t ret = dev->read_sectors(dev,
start >> shift, count >> shift, buf);
if (ret < 0)
return ret;
else
return ret << shift;
} else {
return ata_read_unaligned(dev, start, count, buf);
}
} else {
printf("ata: No support for sectors smaller than 512 bytes.\n");
return -1;
}
}
static ssize_t ata_write512(storage_dev_t *const dev,
const lba_t start, const size_t count,
const unsigned char *const buf)
{
printf("ata: No write support implemented.\n");
return -1;
}
void ata_initialize_storage_ops(ata_dev_t *const dev)
{
dev->storage_dev.read_blocks512 = ata_read512;
dev->storage_dev.write_blocks512 = ata_write512;
}
int ata_set_sector_size(ata_dev_t *const dev, u32 sector_size)
{
if (!sector_size || (sector_size & (sector_size - 1))) {
printf("ata: Sector size is not a power of two (%u).\n",
sector_size);
return -1;
}
dev->sector_size = sector_size;
dev->sector_size_shift = 0;
while (sector_size >>= 1)
++dev->sector_size_shift;
return 0;
}
static int ata_decode_sector_size(ata_dev_t *const dev, const u16 *const id)
{
u32 size;
if ((id[ATA_ID_SECTOR_SIZE] & ((3 << 14) | (1 << 12)))
!= ((1 << 14) | (1 << 12)))
size = DEFAULT_ATA_SECTOR_SIZE;
else
size = (id[ATA_ID_LOGICAL_SECTOR_SIZE] |
(id[ATA_ID_LOGICAL_SECTOR_SIZE + 1] << 16)) << 1;
return ata_set_sector_size(dev, size);
}
/**
* Copies n-1 bytes from src to dest swapping each two bytes, removes
* trailing spaces and terminates dest with '\0'.
*/
char *ata_strncpy(char *const dest, const u16 *const src, const size_t n)
{
int i;
for (i = 0; i < (n - 1); i += 2) {
dest[i] = ((const char *)src)[i + 1];
dest[i + 1] = ((const char *)src)[i];
}
for (i = n - 2; i >= 0; --i)
if (dest[i] != ' ')
break;
dest[i + 1] = '\0';
return dest;
}
int ata_attach_device(ata_dev_t *const dev, const storage_port_t port_type)
{
u16 id[256];
dev->identify_cmd = ATA_IDENTIFY_DEVICE;
if (dev->identify(dev, (u8 *)id))
return -1;
char fw[9], model[41];
ata_strncpy(fw, id + 23, sizeof(fw));
ata_strncpy(model, id + 27, sizeof(model));
printf("ata: Identified %s [%s]\n", model, fw);
#ifdef CONFIG_LP_STORAGE_64BIT_LBA
if (id[ATA_CMDS_AND_FEATURE_SETS + 1] & (1 << 10)) {
printf("ata: Support for LBA-48 enabled.\n");
dev->read_cmd = ATA_READ_DMA_EXT;
} else {
dev->read_cmd = ATA_READ_DMA;
}
#else
dev->read_cmd = ATA_READ_DMA;
#endif
if (ata_decode_sector_size(dev, id))
return -1;
dev->storage_dev.port_type = port_type;
ata_initialize_storage_ops(dev);
return storage_attach_device(&dev->storage_dev);
}
|
