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
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
|
/*
* Copyright (C) 2011 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 );
/** @file
*
* Command line and initrd passed to iPXE at runtime
*
*/
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <assert.h>
#include <ipxe/init.h>
#include <ipxe/image.h>
#include <ipxe/script.h>
#include <ipxe/umalloc.h>
#include <realmode.h>
/** Command line physical address
*
* This can be set by the prefix.
*/
uint32_t __bss16 ( cmdline_phys );
#define cmdline_phys __use_data16 ( cmdline_phys )
/** initrd physical address
*
* This can be set by the prefix.
*/
uint32_t __bss16 ( initrd_phys );
#define initrd_phys __use_data16 ( initrd_phys )
/** initrd length
*
* This can be set by the prefix.
*/
uint32_t __bss16 ( initrd_len );
#define initrd_len __use_data16 ( initrd_len )
/** Internal copy of the command line */
static char *cmdline_copy;
/** Free command line image */
static void cmdline_image_free ( struct refcnt *refcnt ) {
struct image *image = container_of ( refcnt, struct image, refcnt );
DBGC ( image, "RUNTIME freeing command line\n" );
free ( cmdline_copy );
}
/** Embedded script representing the command line */
static struct image cmdline_image = {
.refcnt = REF_INIT ( cmdline_image_free ),
.name = "<CMDLINE>",
.type = &script_image_type,
};
/** Colour for debug messages */
#define colour &cmdline_image
/**
* Strip unwanted cruft from command line
*
* @v cmdline Command line
* @v cruft Initial substring of cruft to strip
*/
static void cmdline_strip ( char *cmdline, const char *cruft ) {
char *strip;
char *strip_end;
/* Find unwanted cruft, if present */
if ( ! ( strip = strstr ( cmdline, cruft ) ) )
return;
/* Strip unwanted cruft */
strip_end = strchr ( strip, ' ' );
if ( strip_end ) {
*strip_end = '\0';
DBGC ( colour, "RUNTIME stripping \"%s\"\n", strip );
strcpy ( strip, ( strip_end + 1 ) );
} else {
DBGC ( colour, "RUNTIME stripping \"%s\"\n", strip );
*strip = '\0';
}
}
/**
* Initialise command line
*
* @ret rc Return status code
*/
static int cmdline_init ( void ) {
userptr_t cmdline_user;
char *cmdline;
size_t len;
int rc;
/* Do nothing if no command line was specified */
if ( ! cmdline_phys ) {
DBGC ( colour, "RUNTIME found no command line\n" );
return 0;
}
cmdline_user = phys_to_user ( cmdline_phys );
len = ( strlen_user ( cmdline_user, 0 ) + 1 /* NUL */ );
/* Allocate and copy command line */
cmdline_copy = malloc ( len );
if ( ! cmdline_copy ) {
DBGC ( colour, "RUNTIME could not allocate %zd bytes for "
"command line\n", len );
rc = -ENOMEM;
goto err_alloc_cmdline_copy;
}
cmdline = cmdline_copy;
copy_from_user ( cmdline, cmdline_user, 0, len );
DBGC ( colour, "RUNTIME found command line \"%s\" at %08x\n",
cmdline, cmdline_phys );
/* Mark command line as consumed */
cmdline_phys = 0;
/* Strip unwanted cruft from the command line */
cmdline_strip ( cmdline, "BOOT_IMAGE=" );
cmdline_strip ( cmdline, "initrd=" );
while ( isspace ( *cmdline ) )
cmdline++;
DBGC ( colour, "RUNTIME using command line \"%s\"\n", cmdline );
/* Prepare and register image */
cmdline_image.data = virt_to_user ( cmdline );
cmdline_image.len = strlen ( cmdline );
if ( cmdline_image.len ) {
if ( ( rc = register_image ( &cmdline_image ) ) != 0 ) {
DBGC ( colour, "RUNTIME could not register command "
"line: %s\n", strerror ( rc ) );
goto err_register_image;
}
}
/* Drop our reference to the image */
image_put ( &cmdline_image );
return 0;
err_register_image:
image_put ( &cmdline_image );
err_alloc_cmdline_copy:
return rc;
}
/**
* Initialise initrd
*
* @ret rc Return status code
*/
static int initrd_init ( void ) {
struct image *image;
int rc;
/* Do nothing if no initrd was specified */
if ( ! initrd_phys ) {
DBGC ( colour, "RUNTIME found no initrd\n" );
return 0;
}
if ( ! initrd_len ) {
DBGC ( colour, "RUNTIME found empty initrd\n" );
return 0;
}
DBGC ( colour, "RUNTIME found initrd at [%x,%x)\n",
initrd_phys, ( initrd_phys + initrd_len ) );
/* Allocate image */
image = alloc_image ( NULL );
if ( ! image ) {
DBGC ( colour, "RUNTIME could not allocate image for "
"initrd\n" );
rc = -ENOMEM;
goto err_alloc_image;
}
if ( ( rc = image_set_name ( image, "<INITRD>" ) ) != 0 ) {
DBGC ( colour, "RUNTIME could not set image name: %s\n",
strerror ( rc ) );
goto err_set_name;
}
/* Allocate and copy initrd content */
image->data = umalloc ( initrd_len );
if ( ! image->data ) {
DBGC ( colour, "RUNTIME could not allocate %d bytes for "
"initrd\n", initrd_len );
rc = -ENOMEM;
goto err_umalloc;
}
image->len = initrd_len;
memcpy_user ( image->data, 0, phys_to_user ( initrd_phys ), 0,
initrd_len );
/* Mark initrd as consumed */
initrd_phys = 0;
/* Register image */
if ( ( rc = register_image ( image ) ) != 0 ) {
DBGC ( colour, "RUNTIME could not register initrd: %s\n",
strerror ( rc ) );
goto err_register_image;
}
/* Drop our reference to the image */
image_put ( image );
return 0;
err_register_image:
err_umalloc:
err_set_name:
image_put ( image );
err_alloc_image:
return rc;
}
/**
* Initialise command line and initrd
*
*/
static void runtime_init ( void ) {
int rc;
/* Initialise command line */
if ( ( rc = cmdline_init() ) != 0 ) {
/* No way to report failure */
return;
}
/* Initialise initrd */
if ( ( rc = initrd_init() ) != 0 ) {
/* No way to report failure */
return;
}
}
/** Command line and initrd initialisation function */
struct startup_fn runtime_startup_fn __startup_fn ( STARTUP_NORMAL ) = {
.startup = runtime_init,
};
|
