exec.c revision 1.13 
1/*	$NetBSD: exec.c,v 1.13 1999/05/15 15:42:23 drochner Exp $	 */
2
3/*
4 * Copyright (c) 1982, 1986, 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 * Copyright (c) 1996
7 *	Matthias Drochner.  All rights reserved.
8 * Copyright (c) 1996
9 * 	Perry E. Metzger.  All rights reserved.
10 * Copyright (c) 1997
11 * 	Martin Husemann.  All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 *    must display the following acknowledgement:
23 *	This product includes software developed by the University of
24 *	California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 *    may be used to endorse or promote products derived from this software
27 *    without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 * 	@(#)boot.c	8.1 (Berkeley) 6/10/93
42 */
43
44/*
45 * starts NetBSD a.out kernel
46 * needs lowlevel startup from startprog.S
47 * This is a special version of exec.c to support use of XMS.
48 */
49
50#include <sys/param.h>
51#include <sys/reboot.h>
52#ifdef COMPAT_OLDBOOT
53#include <sys/disklabel.h>
54#endif
55
56#include <lib/libsa/stand.h>
57
58#include "loadfile.h"
59#include "libi386.h"
60#include "bootinfo.h"
61
62#ifdef COMPAT_OLDBOOT
63static int dev2major __P((char *, int *));
64
65static int
66dev2major(devname, major)
67	char           *devname;
68	int            *major;
69{
70	static char    *devices[] = {"wd", "", "fd", "", "sd"};
71#define NUMDEVICES (sizeof(devices)/sizeof(char *))
72	int             i;
73
74	for (i = 0; i < NUMDEVICES; i++)
75		if (!strcmp(devname, devices[i])) {
76			*major = i;
77			return (0);
78		}
79	return (-1);
80}
81#endif
82#define BOOT_NARGS	6
83
84extern struct btinfo_console btinfo_console;
85
86int
87exec_netbsd(file, loadaddr, boothowto)
88	const char     *file;
89	physaddr_t      loadaddr;
90	int             boothowto;
91{
92	u_long          boot_argv[BOOT_NARGS];
93	int		fd;
94	u_long		marks[MARK_MAX];
95	struct btinfo_symtab btinfo_symtab;
96	u_long		extmem;
97#ifdef XMS
98	u_long		xmsmem;
99	physaddr_t	origaddr = loadaddr;
100#endif
101
102#ifdef COMPAT_OLDBOOT
103	char           *fsname, *devname;
104	int             unit, part;
105	const char     *filename;
106	int             bootdevnr;
107#endif
108
109#ifdef	DEBUG
110	printf("exec: file=%s loadaddr=0x%lx\n",
111	       file ? file : "NULL", loadaddr);
112#endif
113
114	BI_ALLOC(6); /* ??? */
115
116	BI_ADD(&btinfo_console, BTINFO_CONSOLE, sizeof(struct btinfo_console));
117
118	extmem = getextmem();
119
120#ifdef XMS
121	if ((getextmem1() == 0) && (xmsmem = checkxms())) {
122	        u_long kernsize;
123
124		/*
125		 * With "CONSERVATIVE_MEMDETECT", extmem is 0 because
126		 *  getextmem() is getextmem1(). Without, the "smart"
127		 *  methods could fail to report all memory as well.
128		 * xmsmem is a few kB less than the actual size, but
129		 *  better than nothing.
130		 */
131		if (xmsmem > extmem)
132			extmem = xmsmem;
133		/*
134		 * Get the size of the kernel
135		 */
136		marks[MARK_START] = loadaddr;
137		if ((fd = loadfile(file, marks, COUNT_KERNEL)) == -1)
138			goto out;
139		close(fd);
140
141		kernsize = marks[MARK_END];
142		kernsize = (kernsize + 1023) / 1024;
143
144		loadaddr = xmsalloc(kernsize);
145		if (!loadaddr)
146			return(ENOMEM);
147	}
148#endif
149	marks[MARK_START] = loadaddr;
150	if ((fd = loadfile(file, marks, LOAD_KERNEL)) == -1)
151		goto out;
152
153	boot_argv[0] = boothowto;
154
155#ifdef COMPAT_OLDBOOT
156	/* prepare boot device information for kernel */
157	if (parsebootfile(file, &fsname, &devname, &unit, &part, &filename)
158	    || strcmp(fsname, "ufs"))
159		bootdevnr = 0;	/* XXX error out if parse error??? */
160	else {
161		int             major;
162
163		if (strcmp(devname, "hd") == 0) {
164			/* generic BIOS disk, have to guess type */
165			struct open_file *f = &files[fd];	/* XXX */
166
167			if (biosdisk_gettype(f) == DTYPE_SCSI)
168				devname = "sd";
169			else
170				devname = "wd";
171
172			/*
173			 * The old boot block performed the following
174			 * conversion:
175			 *
176			 *	hdN -> Xd0
177			 *
178			 * where X is the type specified by the label.
179			 * We mimmick that here, for lack of any better
180			 * way of doing things.
181			 */
182			unit = 0;
183		}
184
185		if (dev2major(devname, &major))
186			bootdevnr = 0;	/* XXX error out??? */
187		else
188			bootdevnr = MAKEBOOTDEV(major, 0, 0, unit, part);
189	}
190
191	boot_argv[1] = bootdevnr;
192#else
193	boot_argv[1] = 0;
194#endif
195	boot_argv[2] = vtophys(bootinfo);	/* old cyl offset */
196	/* argv[3] below */
197	boot_argv[4] = extmem;
198	boot_argv[5] = getbasemem();
199
200	close(fd);
201
202	/*
203	 * Gather some information for the kernel. Do this after the
204	 * "point of no return" to avoid memory leaks.
205	 * (but before DOS might be trashed in the XMS case)
206	 */
207#ifdef PASS_BIOSGEOM
208	bi_getbiosgeom();
209#endif
210#ifdef PASS_MEMMAP
211	bi_getmemmap();
212#endif
213
214#ifdef XMS
215	if (loadaddr != origaddr) {
216		/*
217		 * We know have done our last DOS IO, so we may
218		 * trash the OS. Copy the data from the temporary
219		 * buffer to its real adress.
220		 */
221		marks[MARK_START] -= loadaddr;
222		marks[MARK_END] -= loadaddr;
223		marks[MARK_SYM] -= loadaddr;
224		marks[MARK_END] -= loadaddr;
225		ppbcopy(loadaddr, origaddr, marks[MARK_END]);
226	}
227#endif
228	marks[MARK_END] = (((u_long) marks[MARK_END] + sizeof(int) - 1)) &
229	    (-sizeof(int));
230
231	boot_argv[3] = marks[MARK_END];
232
233
234#ifdef DEBUG
235	printf("Start @ 0x%lx [%ld=0x%lx-0x%lx]...\n", marks[MARK_ENTRY],
236	    marks[MARK_NSYM], marks[MARK_SYM], marks[MARK_END]);
237#endif
238
239	btinfo_symtab.nsym = marks[MARK_NSYM];
240	btinfo_symtab.ssym = marks[MARK_SYM];
241	btinfo_symtab.esym = marks[MARK_END];
242	BI_ADD(&btinfo_symtab, BTINFO_SYMTAB, sizeof(struct btinfo_symtab));
243
244	startprog(marks[MARK_ENTRY], BOOT_NARGS, boot_argv, 0x90000);
245	panic("exec returned");
246
247out:
248	BI_FREE();
249	bootinfo = 0;
250	return (-1);
251}
252