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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013 The Chromium OS Authors.
* Coypright (c) 2013 Guntermann & Drunck GmbH
*/
#define LOG_CATEGORY UCLASS_TPM
#include <common.h>
#include <dm.h>
#include <asm/unaligned.h>
#include <tpm-common.h>
#include "tpm-utils.h"
int pack_byte_string(u8 *str, size_t size, const char *format, ...)
{
va_list args;
size_t offset = 0, length = 0;
u8 *data = NULL;
u32 value = 0;
va_start(args, format);
for (; *format; format++) {
switch (*format) {
case 'b':
offset = va_arg(args, size_t);
value = va_arg(args, int);
length = 1;
break;
case 'w':
offset = va_arg(args, size_t);
value = va_arg(args, int);
length = 2;
break;
case 'd':
offset = va_arg(args, size_t);
value = va_arg(args, u32);
length = 4;
break;
case 's':
offset = va_arg(args, size_t);
data = va_arg(args, u8 *);
length = va_arg(args, u32);
break;
default:
debug("Couldn't recognize format string\n");
va_end(args);
return -1;
}
if (offset + length > size) {
va_end(args);
return -1;
}
switch (*format) {
case 'b':
str[offset] = value;
break;
case 'w':
put_unaligned_be16(value, str + offset);
break;
case 'd':
put_unaligned_be32(value, str + offset);
break;
case 's':
memcpy(str + offset, data, length);
break;
}
}
va_end(args);
return 0;
}
int unpack_byte_string(const u8 *str, size_t size, const char *format, ...)
{
va_list args;
size_t offset = 0, length = 0;
u8 *ptr8 = NULL;
u16 *ptr16 = NULL;
u32 *ptr32 = NULL;
va_start(args, format);
for (; *format; format++) {
switch (*format) {
case 'b':
offset = va_arg(args, size_t);
ptr8 = va_arg(args, u8 *);
length = 1;
break;
case 'w':
offset = va_arg(args, size_t);
ptr16 = va_arg(args, u16 *);
length = 2;
break;
case 'd':
offset = va_arg(args, size_t);
ptr32 = va_arg(args, u32 *);
length = 4;
break;
case 's':
offset = va_arg(args, size_t);
ptr8 = va_arg(args, u8 *);
length = va_arg(args, u32);
break;
default:
va_end(args);
debug("Couldn't recognize format string\n");
return -1;
}
if (offset + length > size) {
va_end(args);
log_err("Failed to read: size=%d, offset=%x, len=%x\n",
size, offset, length);
return -1;
}
switch (*format) {
case 'b':
*ptr8 = str[offset];
break;
case 'w':
*ptr16 = get_unaligned_be16(str + offset);
break;
case 'd':
*ptr32 = get_unaligned_be32(str + offset);
break;
case 's':
memcpy(ptr8, str + offset, length);
break;
}
}
va_end(args);
return 0;
}
u32 tpm_command_size(const void *command)
{
const size_t command_size_offset = 2;
return get_unaligned_be32(command + command_size_offset);
}
u32 tpm_return_code(const void *response)
{
const size_t return_code_offset = 6;
return get_unaligned_be32(response + return_code_offset);
}
u32 tpm_sendrecv_command(struct udevice *dev, const void *command,
void *response, size_t *size_ptr)
{
int err, ret;
u8 response_buffer[COMMAND_BUFFER_SIZE];
size_t response_length;
int i;
if (response) {
response_length = *size_ptr;
} else {
response = response_buffer;
response_length = sizeof(response_buffer);
}
err = tpm_xfer(dev, command, tpm_command_size(command),
response, &response_length);
if (err < 0)
return err;
if (size_ptr)
*size_ptr = response_length;
ret = tpm_return_code(response);
log_debug("TPM response [ret:%d]: ", ret);
for (i = 0; i < response_length; i++)
log_debug("%02x ", ((u8 *)response)[i]);
log_debug("\n");
return ret;
}
int tpm_init(struct udevice *dev)
{
return tpm_open(dev);
}
|
