boot.c revision 1.8 
1/*	$NetBSD: boot.c,v 1.8 2000/07/25 06:26:19 tsubai Exp $	*/
2
3/*-
4 * Copyright (c) 1997 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the NetBSD
21 *	Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39/*
40 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
41 * Copyright (C) 1995, 1996 TooLs GmbH.
42 * All rights reserved.
43 *
44 * ELF support derived from NetBSD/alpha's boot loader, written
45 * by Christopher G. Demetriou.
46 *
47 * Redistribution and use in source and binary forms, with or without
48 * modification, are permitted provided that the following conditions
49 * are met:
50 * 1. Redistributions of source code must retain the above copyright
51 *    notice, this list of conditions and the following disclaimer.
52 * 2. Redistributions in binary form must reproduce the above copyright
53 *    notice, this list of conditions and the following disclaimer in the
54 *    documentation and/or other materials provided with the distribution.
55 * 3. All advertising materials mentioning features or use of this software
56 *    must display the following acknowledgement:
57 *	This product includes software developed by TooLs GmbH.
58 * 4. The name of TooLs GmbH may not be used to endorse or promote products
59 *    derived from this software without specific prior written permission.
60 *
61 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
62 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
63 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
64 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
65 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
66 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
67 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
68 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
69 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
70 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
71 */
72
73/*
74 * First try for the boot code
75 *
76 * Input syntax is:
77 *	[promdev[{:|,}partition]]/[filename] [flags]
78 */
79
80#define	ELFSIZE		32		/* We use 32-bit ELF. */
81
82#include <sys/param.h>
83#include <sys/exec.h>
84#include <sys/exec_elf.h>
85#include <sys/reboot.h>
86#include <sys/disklabel.h>
87
88#include <lib/libsa/stand.h>
89#include <lib/libsa/loadfile.h>
90#include <lib/libkern/libkern.h>
91
92#include <machine/cpu.h>
93#include <machine/machine_type.h>
94
95#include "ofdev.h"
96#include "openfirm.h"
97
98char bootdev[128];
99char bootfile[128];
100int boothowto;
101int debug;
102
103static ofw_version = 0;
104
105static void
106prom2boot(dev)
107	char *dev;
108{
109	char *cp;
110
111	cp = dev + strlen(dev) - 1;
112	for (; *cp; cp--) {
113		if (*cp == ':') {
114			if (ofw_version < 3) {
115				/* sd@0:0 -> sd@0 */
116				*cp = 0;
117				break;
118			} else {
119				/* disk@0:5,boot -> disk@0:0 */
120				strcpy(cp, ":0");
121				break;
122			}
123		}
124	}
125}
126
127static void
128parseargs(str, howtop)
129	char *str;
130	int *howtop;
131{
132	char *cp;
133
134	/* Allow user to drop back to the PROM. */
135	if (strcmp(str, "exit") == 0)
136		OF_exit();
137
138	*howtop = 0;
139
140	cp = str;
141	if (*cp == '-')
142		goto found;
143	for (cp = str; *cp; cp++)
144		if (*cp == ' ')
145			goto found;
146	return;
147
148found:
149	*cp++ = 0;
150	while (*cp) {
151		switch (*cp++) {
152		case 'a':
153			*howtop |= RB_ASKNAME;
154			break;
155		case 's':
156			*howtop |= RB_SINGLE;
157			break;
158		case 'd':
159			*howtop |= RB_KDB;
160			debug = 1;
161			break;
162		}
163	}
164}
165
166static void
167chain(entry, args, ssym, esym)
168	void (*entry)();
169	char *args;
170	void *ssym, *esym;
171{
172	extern char end[];
173	int l, machine_tag;
174
175	/*
176	 * Stash pointer to end of symbol table after the argument
177	 * strings.
178	 */
179	l = strlen(args) + 1;
180	bcopy(&ssym, args + l, sizeof(ssym));
181	l += sizeof(ssym);
182	bcopy(&esym, args + l, sizeof(esym));
183	l += sizeof(esym);
184
185	/*
186	 * Tell the kernel we're an OpenFirmware system.
187	 */
188	machine_tag = POWERPC_MACHINE_OPENFIRMWARE;
189	bcopy(&machine_tag, args + l, sizeof(machine_tag));
190	l += sizeof(machine_tag);
191
192	OF_chain((void *)RELOC, end - (char *)RELOC, entry, args, l);
193	panic("chain");
194}
195
196__dead void
197_rtt()
198{
199
200	OF_exit();
201}
202
203void
204main()
205{
206	extern char bootprog_name[], bootprog_rev[],
207		    bootprog_maker[], bootprog_date[];
208	int chosen, options, openprom;
209	char bootline[512];		/* Should check size? */
210	char *cp;
211	u_long marks[MARK_MAX];
212	u_int32_t entry;
213	void *ssym, *esym;
214
215	printf("\n");
216	printf(">> %s, Revision %s\n", bootprog_name, bootprog_rev);
217	printf(">> (%s, %s)\n", bootprog_maker, bootprog_date);
218
219	/*
220	 * Figure out what version of Open Firmware...
221	 */
222	if ((openprom = OF_finddevice("/openprom")) != -1) {
223		char model[32];
224
225		bzero(model, sizeof model);
226		OF_getprop(openprom, "model", model, sizeof model);
227		for (cp = model; *cp; cp++)
228			if (*cp >= '0' && *cp <= '9') {
229				ofw_version = *cp - '0';
230				break;
231			}
232#if 0
233		printf(">> Open Firmware version %d.x\n", ofw_version);
234#endif
235	}
236
237	/*
238	 * Get the boot arguments from Openfirmware
239	 */
240	if ((chosen = OF_finddevice("/chosen")) == -1 ||
241	    OF_getprop(chosen, "bootpath", bootdev, sizeof bootdev) < 0 ||
242	    OF_getprop(chosen, "bootargs", bootline, sizeof bootline) < 0) {
243		printf("Invalid Openfirmware environment\n");
244		OF_exit();
245	}
246
247	/*
248	 * Some versions of Openfirmware sets bootpath to "".
249	 * We use boot-device instead if it occurs.
250	 */
251	if (bootdev[0] == 0) {
252		printf("Cannot use bootpath\n");
253		if ((options = OF_finddevice("/options")) == -1 ||
254		    OF_getprop(options, "boot-device", bootdev,
255			       sizeof bootdev) < 0) {
256			printf("Invalid Openfirmware environment\n");
257			OF_exit();
258		}
259		printf("Using boot-device instead\n");
260	}
261
262	prom2boot(bootdev);
263	parseargs(bootline, &boothowto);
264
265	for (;;) {
266		if (boothowto & RB_ASKNAME) {
267			printf("Boot: ");
268			gets(bootline);
269			parseargs(bootline, &boothowto);
270		}
271		marks[MARK_START] = 0;
272		if (loadfile(bootline, marks, LOAD_ALL) >= 0)
273			break;
274		if (errno)
275			printf("open %s: %s\n", opened_name, strerror(errno));
276		boothowto |= RB_ASKNAME;
277	}
278#ifdef	__notyet__
279	OF_setprop(chosen, "bootpath", opened_name, strlen(opened_name) + 1);
280	cp = bootline;
281#else
282	strcpy(bootline, opened_name);
283	cp = bootline + strlen(bootline);
284	*cp++ = ' ';
285#endif
286	*cp = '-';
287	if (boothowto & RB_ASKNAME)
288		*++cp = 'a';
289	if (boothowto & RB_SINGLE)
290		*++cp = 's';
291	if (boothowto & RB_KDB)
292		*++cp = 'd';
293	if (*cp == '-')
294#ifdef	__notyet__
295		*cp = 0;
296#else
297		*--cp = 0;
298#endif
299	else
300		*++cp = 0;
301#ifdef	__notyet__
302	OF_setprop(chosen, "bootargs", bootline, strlen(bootline) + 1);
303#endif
304
305	entry = marks[MARK_ENTRY];
306	ssym = (void *)marks[MARK_SYM];
307	esym = (void *)marks[MARK_END];
308
309	printf(" start=0x%x\n", entry);
310	__syncicache((void *)entry, (u_int)ssym - (u_int)entry);
311	chain((void *)entry, bootline, ssym, esym);
312
313	OF_exit();
314}
315