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source: bootcd/isolinux/syslinux-6.03/com32/chain/options.c @ 7b6b7ba

Last change on this file since 7b6b7ba was e16e8f2, checked in by Edwin Eefting <edwin@datux.nl>, 3 years ago
bootstuff
Property mode set to `100644`
File size: 13.8 KB

Line
1	/* ----------------------------------------------------------------------- *
2	*
3	* Copyright 2003-2009 H. Peter Anvin - All Rights Reserved
4	* Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
5	* Copyright 2010 Shao Miller
6	* Copyright 2010-2012 Michal Soltys
7	*
8	* Permission is hereby granted, free of charge, to any person
9	* obtaining a copy of this software and associated documentation
10	* files (the "Software"), to deal in the Software without
11	* restriction, including without limitation the rights to use,
12	* copy, modify, merge, publish, distribute, sublicense, and/or
13	* sell copies of the Software, and to permit persons to whom
14	* the Software is furnished to do so, subject to the following
15	* conditions:
16	*
17	* The above copyright notice and this permission notice shall
18	* be included in all copies or substantial portions of the Software.
19	*
20	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
22	* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
24	* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
25	* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
27	* OTHER DEALINGS IN THE SOFTWARE.
28	*
29	* ----------------------------------------------------------------------- */
30
31	#include <syslinux/movebits.h>
32	#include <stdint.h>
33	#include <stdlib.h>
34	#include <string.h>
35	#include "chain.h"
36	#include "partiter.h"
37	#include "utility.h"
38	#include "options.h"
39
40	struct options opt;
41
42	static int soi_s2n(char *ptr,
43	addr_t *seg,
44	addr_t *off,
45	addr_t *ip,
46	addr_t def)
47	{
48	addr_t segval, offval, ipval, val;
49	char *p;
50
51	/* defaults */
52	segval = 0;
53	offval = def;
54	ipval = def;
55
56	segval = strtoul(ptr, &p, 0);
57	if (p[0] == ':' && p[1] && p[1] != ':')
58	offval = strtoul(p+1, &p, 0);
59	if (p[0] == ':' && p[1] && p[1] != ':')
60	ipval = strtoul(p+1, NULL, 0);
61
62	/* verify if load address is within [dosmin, dosmax) */
63	val = (segval << 4) + offval;
64
65	if (val < dosmin \|\| val >= dosmax) {
66	error("Invalid seg:off:* address specified.");
67	goto bail;
68	}
69
70	/*
71	* verify if jump address is within [dosmin, dosmax) and offset is 16bit
72	* sane
73	*/
74	val = (segval << 4) + ipval;
75
76	if (ipval > 0xFFFE \|\| val < dosmin \|\| val >= dosmax) {
77	error("Invalid seg:*:ip address specified.");
78	goto bail;
79	}
80
81	if (seg)
82	*seg = segval;
83	if (off)
84	*off = offval;
85	if (ip)
86	*ip = ipval;
87
88	return 0;
89	bail:
90	return -1;
91	}
92
93	static void usage(void)
94	{
95	size_t i;
96	static const char *const usage[] = {
97	"Usage:",
98	"",
99	" disk + partition selection:",
100	" chain.c32 [options]",
101	" chain.c32 hd#[,#] [options]",
102	" chain.c32 fd#[,#] [options]",
103	" chain.c32 mbr=<id>[,#] [options]",
104	" chain.c32 guid=<guid>[,#] [options]",
105	" chain.c32 boot[,#] [options]",
106	"",
107	" direct partition selection:",
108	" chain.c32 guid=<guid> [options]",
109	" chain.c32 label=<label> [options]",
110	" chain.c32 fs [options]",
111	"",
112	"You can use ':' instead of '=' and ' ' instead of ','.",
113	"The default is 'boot,0'.",
114	"",
115	"Options:",
116	" sect[=<s[:o[:i]]>] Load sector at <s:o>, jump to <s:i>",
117	" - defaults to 0:0x7C00:0x7C00",
118	" - omitted o/i values default to 0",
119	" maps Map loaded sector into real memory",
120	" setbpb Fix BPB fields in loaded sector",
121	" filebpb Apply 'setbpb' to loaded file",
122	" save Write adjusted sector back to disk",
123	" hand Prepare handover area",
124	" hptr Force ds:si and ds:bp to point to handover area",
125	" swap Swap drive numbers, if bootdisk is not fd0/hd0",
126	" nohide Disable all hide variations (default)",
127	" hide Hide primary partitions, unhide selected partition",
128	" hideall Hide all partitions, unhide selected partition",
129	" unhide Unhide primary partitions",
130	" unhideall Unhide all partitions",
131	" fixchs Walk all partitions and fix E/MBRs' CHS values",
132	" keeppxe Keep the PXE and UNDI stacks in memory (PXELINUX)",
133	" warn Wait for a keypress to continue chainloading",
134	" break Don't chainload",
135	" strict[=<0\|1\|2>] Set the level of strictness in sanity checks",
136	" - strict w/o any value is the same as strict=2",
137	" relax The same as strict=0",
138	" prefmbr On hybrid MBR/GPT disks, prefer legacy layout",
139	"",
140	" file=<file> Load and execute <file>",
141	" seg=<s[:o[:i]]> Load file at <s:o>, jump to <s:i>",
142	" - defaults to 0:0x7C00:0x7C00",
143	" - omitted o/i values default to 0",
144	" isolinux=<loader> Load another version of ISOLINUX",
145	" ntldr=<loader> Load Windows NTLDR, SETUPLDR.BIN or BOOTMGR",
146	" reactos=<loader> Load ReactOS's loader",
147	" cmldr=<loader> Load Recovery Console of Windows NT/2K/XP/2003",
148	" freedos=<loader> Load FreeDOS KERNEL.SYS",
149	" msdos=<loader> Load MS-DOS 2.xx - 6.xx IO.SYS",
150	" msdos7=<loader> Load MS-DOS 7+ IO.SYS",
151	" pcdos=<loader> Load PC-DOS IBMBIO.COM",
152	" drmk=<loader> Load DRMK DELLBIO.BIN",
153	" grub=<loader> Load GRUB Legacy stage2",
154	" grubcfg=<config> Set alternative config filename for GRUB Legacy",
155	" grldr=<loader> Load GRUB4DOS grldr",
156	" bss=<sectimage> Emulate syslinux's BSS",
157	" bs=<sectimage> Emulate syslinux's BS",
158	"",
159	"Please see doc/chain.txt for the detailed documentation."
160	};
161	for (i = 0; i < sizeof(usage)/sizeof(usage[0]); i++) {
162	if (i % 20 == 19) {
163	puts("Press any key...");
164	wait_key();
165	}
166	puts(usage[i]);
167	}
168	}
169
170	void opt_set_defs(void)
171	{
172	memset(&opt, 0, sizeof opt);
173	opt.sect = true; /* by def. load sector */
174	opt.maps = true; /* by def. map sector */
175	opt.hand = true; /* by def. prepare handover */
176	opt.brkchain = false; /* by def. do chainload */
177	opt.piflags = PIF_STRICT; /* by def. be strict, but ignore disk sizes */
178	opt.foff = opt.soff = opt.fip = opt.sip = 0x7C00;
179	opt.drivename = "boot";
180	#ifdef DEBUG
181	opt.warn = true;
182	#endif
183	}
184
185	int opt_parse_args(int argc, char *argv[])
186	{
187	int i;
188	size_t v;
189	char *p;
190
191	for (i = 1; i < argc; i++) {
192	if (!strncmp(argv[i], "file=", 5)) {
193	opt.file = argv[i] + 5;
194	} else if (!strcmp(argv[i], "nofile")) {
195	opt.file = NULL;
196	} else if (!strncmp(argv[i], "seg=", 4)) {
197	if (soi_s2n(argv[i] + 4, &opt.fseg, &opt.foff, &opt.fip, 0))
198	goto bail;
199	} else if (!strncmp(argv[i], "bss=", 4)) {
200	opt.file = argv[i] + 4;
201	opt.bss = true;
202	opt.maps = false;
203	opt.setbpb = true;
204	} else if (!strncmp(argv[i], "bs=", 3)) {
205	opt.file = argv[i] + 3;
206	opt.sect = false;
207	opt.filebpb = true;
208	} else if (!strncmp(argv[i], "isolinux=", 9)) {
209	opt.file = argv[i] + 9;
210	opt.isolinux = true;
211	opt.hand = false;
212	opt.sect = false;
213	} else if (!strncmp(argv[i], "ntldr=", 6)) {
214	opt.fseg = 0x2000; /* NTLDR wants this address */
215	opt.foff = 0;
216	opt.fip = 0;
217	opt.file = argv[i] + 6;
218	opt.setbpb = true;
219	opt.hand = false;
220	} else if (!strncmp(argv[i], "reactos=", 8)) {
221	/*
222	* settings based on commit
223	* ad4cf1470977f648ee1dd45e97939589ccb0393c
224	* note, conflicts with:
225	* http://reactos.freedoors.org/Reactos%200.3.13/ReactOS-0.3.13-REL-src/boot/freeldr/notes.txt
226	*/
227	opt.fseg = 0;
228	opt.foff = 0x8000;
229	opt.fip = 0x8100;
230	opt.file = argv[i] + 8;
231	opt.setbpb = true;
232	opt.hand = false;
233	} else if (!strncmp(argv[i], "cmldr=", 6)) {
234	opt.fseg = 0x2000; /* CMLDR wants this address */
235	opt.foff = 0;
236	opt.fip = 0;
237	opt.file = argv[i] + 6;
238	opt.cmldr = true;
239	opt.setbpb = true;
240	opt.hand = false;
241	} else if (!strncmp(argv[i], "freedos=", 8)) {
242	opt.fseg = 0x60; /* FREEDOS wants this address */
243	opt.foff = 0;
244	opt.fip = 0;
245	opt.sseg = 0x1FE0;
246	opt.file = argv[i] + 8;
247	opt.setbpb = true;
248	opt.hand = false;
249	} else if ( (v = 6, !strncmp(argv[i], "msdos=", v) \|\|
250	!strncmp(argv[i], "pcdos=", v)) \|\|
251	(v = 7, !strncmp(argv[i], "msdos7=", v)) ) {
252	opt.fseg = 0x70; /* MS-DOS 2.00 .. 6.xx wants this address */
253	opt.foff = 0;
254	opt.fip = v == 7 ? 0x200 : 0; /* MS-DOS 7.0+ wants this ip */
255	opt.sseg = 0x8000;
256	opt.file = argv[i] + v;
257	opt.setbpb = true;
258	opt.hand = false;
259	} else if (!strncmp(argv[i], "drmk=", 5)) {
260	opt.fseg = 0x70; /* DRMK wants this address */
261	opt.foff = 0;
262	opt.fip = 0;
263	opt.sseg = 0x2000;
264	opt.soff = 0;
265	opt.sip = 0;
266	opt.file = argv[i] + 5;
267	/* opt.drmk = true; */
268	opt.setbpb = true;
269	opt.hand = false;
270	} else if (!strncmp(argv[i], "grub=", 5)) {
271	opt.fseg = 0x800; /* stage2 wants this address */
272	opt.foff = 0;
273	opt.fip = 0x200;
274	opt.file = argv[i] + 5;
275	opt.grub = true;
276	opt.hand = false;
277	opt.sect = false;
278	} else if (!strncmp(argv[i], "grubcfg=", 8)) {
279	opt.grubcfg = argv[i] + 8;
280	} else if (!strncmp(argv[i], "grldr=", 6)) {
281	opt.file = argv[i] + 6;
282	opt.grldr = true;
283	opt.hand = false;
284	opt.sect = false;
285	} else if (!strcmp(argv[i], "keeppxe")) {
286	opt.keeppxe = 3;
287	} else if (!strcmp(argv[i], "nokeeppxe")) {
288	opt.keeppxe = 0;
289	} else if (!strcmp(argv[i], "maps")) {
290	opt.maps = true;
291	} else if (!strcmp(argv[i], "nomaps")) {
292	opt.maps = false;
293	} else if (!strcmp(argv[i], "hand")) {
294	opt.hand = true;
295	} else if (!strcmp(argv[i], "nohand")) {
296	opt.hand = false;
297	} else if (!strcmp(argv[i], "hptr")) {
298	opt.hptr = true;
299	} else if (!strcmp(argv[i], "nohptr")) {
300	opt.hptr = false;
301	} else if (!strcmp(argv[i], "swap")) {
302	opt.swap = true;
303	} else if (!strcmp(argv[i], "noswap")) {
304	opt.swap = false;
305	} else if (!strcmp(argv[i], "nohide")) {
306	opt.hide = HIDE_OFF;
307	} else if (!strcmp(argv[i], "hide")) {
308	opt.hide = HIDE_ON;
309	opt.piflags \|= PIF_STRICT \| PIF_STRICTER;
310	} else if (!strcmp(argv[i], "hideall")) {
311	opt.hide = HIDE_ON \| HIDE_EXT;
312	opt.piflags \|= PIF_STRICT \| PIF_STRICTER;
313	} else if (!strcmp(argv[i], "unhide")) {
314	opt.hide = HIDE_ON \| HIDE_REV;
315	opt.piflags \|= PIF_STRICT \| PIF_STRICTER;
316	} else if (!strcmp(argv[i], "unhideall")) {
317	opt.hide = HIDE_ON \| HIDE_EXT \| HIDE_REV;
318	opt.piflags \|= PIF_STRICT \| PIF_STRICTER;
319	} else if (!strcmp(argv[i], "setbpb")) {
320	opt.setbpb = true;
321	} else if (!strcmp(argv[i], "nosetbpb")) {
322	opt.setbpb = false;
323	} else if (!strcmp(argv[i], "filebpb")) {
324	opt.filebpb = true;
325	} else if (!strcmp(argv[i], "nofilebpb")) {
326	opt.filebpb = false;
327	} else if (!strncmp(argv[i], "sect=", 5) \|\|
328	!strcmp(argv[i], "sect")) {
329	if (argv[i][4]) {
330	if (soi_s2n(argv[i] + 5, &opt.sseg, &opt.soff, &opt.sip, 0))
331	goto bail;
332	}
333	opt.sect = true;
334	} else if (!strcmp(argv[i], "nosect")) {
335	opt.sect = false;
336	opt.maps = false;
337	} else if (!strcmp(argv[i], "save")) {
338	opt.save = true;
339	opt.piflags \|= PIF_STRICT \| PIF_STRICTER;
340	} else if (!strcmp(argv[i], "nosave")) {
341	opt.save = false;
342	} else if (!strcmp(argv[i], "fixchs")) {
343	opt.fixchs = true;
344	opt.piflags \|= PIF_STRICT \| PIF_STRICTER;
345	} else if (!strcmp(argv[i], "nofixchs")) {
346	opt.fixchs = false;
347	} else if (!strcmp(argv[i], "relax") \|\| !strcmp(argv[i], "nostrict")) {
348	opt.piflags &= ~(PIF_STRICT \| PIF_STRICTER);
349	} else if (!strcmp(argv[i], "norelax") \|\| !strcmp(argv[i], "strict")) {
350	opt.piflags \|= PIF_STRICT \| PIF_STRICTER;
351	} else if (!strncmp(argv[i], "strict=", 7)) {
352	if (argv[i][7] < '0' \|\| argv[i][7] > '2' \|\| !argv[i][8]) {
353	error("Strict level must be 0, 1 or 2.");
354	goto bail;
355	}
356	opt.piflags &= ~(PIF_STRICT \| PIF_STRICTER);
357	switch (argv[i][7]) {
358	case '2': opt.piflags \|= PIF_STRICTER;
359	case '1': opt.piflags \|= PIF_STRICT; break;
360	default:;
361	}
362	} else if (!strcmp(argv[i], "warn")) {
363	opt.warn = true;
364	} else if (!strcmp(argv[i], "nowarn")) {
365	opt.warn = false;
366	} else if (!strcmp(argv[i], "prefmbr")) {
367	opt.piflags \|= PIF_PREFMBR;
368	} else if (!strcmp(argv[i], "noprefmbr")) {
369	opt.piflags &= ~PIF_PREFMBR;
370	} else if (!strcmp(argv[i], "nobreak")) {
371	opt.brkchain = false;
372	} else if (!strcmp(argv[i], "break")) {
373	opt.brkchain = true;
374	opt.file = NULL;
375	opt.maps = false;
376	opt.hand = false;
377	} else if (((argv[i][0] == 'h' \|\| argv[i][0] == 'f')
378	&& argv[i][1] == 'd')
379	\|\| !strncmp(argv[i], "mbr:", 4)
380	\|\| !strncmp(argv[i], "mbr=", 4)
381	\|\| !strncmp(argv[i], "guid:", 5)
382	\|\| !strncmp(argv[i], "guid=", 5)
383	\|\| !strncmp(argv[i], "label:", 6)
384	\|\| !strncmp(argv[i], "label=", 6)
385	\|\| !strcmp(argv[i], "boot")
386	\|\| !strncmp(argv[i], "boot,", 5)
387	\|\| !strcmp(argv[i], "fs")) {
388	opt.drivename = argv[i];
389	if (strncmp(argv[i], "label", 5))
390	p = strchr(opt.drivename, ',');
391	else
392	p = NULL;
393	if (p) {
394	*p = '\0';
395	opt.partition = p + 1;
396	} else if (argv[i + 1] && argv[i + 1][0] >= '0'
397	&& argv[i + 1][0] <= '9') {
398	opt.partition = argv[++i];
399	}
400	} else {
401	usage();
402	goto bail;
403	}
404	}
405
406	if (opt.grubcfg && !opt.grub) {
407	error("grubcfg=<filename> must be used together with grub=<loader>.");
408	goto bail;
409	}
410
411	if (opt.filebpb && !opt.file) {
412	error("Option 'filebpb' requires a file.");
413	goto bail;
414	}
415
416	if (opt.save && !opt.sect) {
417	error("Option 'save' requires a sector.");
418	goto bail;
419	}
420
421	if (opt.setbpb && !opt.sect) {
422	error("Option 'setbpb' requires a sector.");
423	goto bail;
424	}
425
426	if (opt.maps && !opt.sect) {
427	error("Option 'maps' requires a sector.");
428	goto bail;
429	}
430
431	return 0;
432	bail:
433	return -1;
434	}
435
436	/* vim: set ts=8 sts=4 sw=4 noet: */

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