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1.1 root 1: /*
2: * Ported to boot 386BSD by Julian Elischer ([email protected]) Sept 1992
3: *
4: * Mach Operating System
5: * Copyright (c) 1992, 1991 Carnegie Mellon University
6: * All Rights Reserved.
7: *
8: * Permission to use, copy, modify and distribute this software and its
9: * documentation is hereby granted, provided that both the copyright
10: * notice and this permission notice appear in all copies of the
11: * software, derivative works or modified versions, and any portions
12: * thereof, and that both notices appear in supporting documentation.
13: *
14: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17: *
18: * Carnegie Mellon requests users of this software to return to
19: *
20: * Software Distribution Coordinator or [email protected]
21: * School of Computer Science
22: * Carnegie Mellon University
23: * Pittsburgh PA 15213-3890
24: *
25: * any improvements or extensions that they make and grant Carnegie Mellon
26: * the rights to redistribute these changes.
27: */
28:
29: /*
30: * HISTORY
31: * $Log: version.c,v $
32: * Revision 1.1 1993/03/21 18:08:26 cgd
33: * after 0.2.2 "stable" patches applied
34: *
35: * Revision 2.2 92/04/04 11:34:37 rpd
36: * Change date in banner.
37: * [92/04/03 16:51:14 rvb]
38: *
39: * Fix Intel Copyright as per B. Davies authorization.
40: * [92/04/03 rvb]
41: * From 2.5 version.
42: * [92/03/30 mg32]
43: *
44: */
45:
46: /*
47: Copyright 1988, 1989, 1990, 1991, 1992
48: by Intel Corporation, Santa Clara, California.
49:
50: All Rights Reserved
51:
52: Permission to use, copy, modify, and distribute this software and
53: its documentation for any purpose and without fee is hereby
54: granted, provided that the above copyright notice appears in all
55: copies and that both the copyright notice and this permission notice
56: appear in supporting documentation, and that the name of Intel
57: not be used in advertising or publicity pertaining to distribution
58: of the software without specific, written prior permission.
59:
60: INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
61: INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
62: IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
63: CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
64: LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
65: NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
66: WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
67: */
68:
69: #include <sys/param.h>
70: #include "boot.h"
71: #include <a.out.h>
72: #include <sys/reboot.h>
73:
74:
75: struct exec head;
76: int argv[10], esym;
77: char *name;
78: char *names[] = {
79: "/386bsd", "/386bsd.old",
80: "/vmunix", "/vmunix.old"
81: };
82: #define NUMNAMES (sizeof(names)/sizeof(char *))
83:
84: extern int end;
85: boot(drive)
86: int drive;
87: {
88: int loadflags, currname = 0;
89: printf("\n>> 386bsd BOOT @ 0x%x: %d/%d k of memory [20/9/92]\n",
90: ouraddr,
91: argv[7] = memsize(0),
92: argv[8] = memsize(1));
93: printf("use options hd(1,...... to boot sd0 when wd0 is also installed\n");
94: gateA20();
95: loadstart:
96: /***************************************************************\
97: * As a default set it to the first partition of the first *
98: * floppy or hard drive *
99: \***************************************************************/
100: part = unit = 0;
101: maj = (drive&0x80 ? 0 : 2); /* a good first bet */
102: name = names[currname++];
103:
104: loadflags = 0;
105: if (currname == NUMNAMES)
106: currname = 0;
107: getbootdev(&loadflags);
108: if (openrd()) {
109: printf("Can't find %s\n", name);
110: goto loadstart;
111: }
112: /* if (inode.i_mode&IEXEC)
113: loadflags |= RB_KDB;
114: */
115: loadprog(loadflags);
116: goto loadstart;
117: }
118:
119: loadprog(howto)
120: int howto;
121: {
122: long int startaddr;
123: long int addr; /* physical address.. not directly useable */
124: int i;
125: static int (*x_entry)() = 0;
126: unsigned char tmpbuf[4096]; /* we need to load the first 4k here */
127:
128: argv[3] = 0;
129: argv[4] = 0;
130: read(&head, sizeof(head));
131: if (head.a_magic == 0413 )
132: {
133: poff = 4096;
134: }
135: else
136: {
137: printf("Invalid format!\n");
138: return;
139: }
140:
141: startaddr = (int)head.a_entry;
142: addr = (startaddr & 0x00f00000); /* some MEG boundary */
143: printf("Booting %s(%d,%c)%s @ 0x%x\n"
144: , devs[maj]
145: , unit
146: , 'a'+part
147: , name
148: , addr);
149: if(addr < ouraddr)
150: {
151: if((addr + head.a_text + head.a_data) > ouraddr)
152: {
153: printf("kernel will not fit below loader\n");
154: return;
155: }
156: if((addr + head.a_text + head.a_data + head.a_bss) > 0xa0000)
157: {
158: printf("kernel too big, won't fit in 640K with bss\n");
159: printf("Only hope is to link the kernel for > 1MB\n");
160: return;
161: }
162: if((addr + head.a_text + head.a_data + head.a_bss) > ouraddr)
163: {
164: printf("loader overlaps bss, kernel must bzero\n");
165: }
166: }
167: printf("text=0x%x", head.a_text);
168: /********************************************************/
169: /* LOAD THE TEXT SEGMENT */
170: /* don't clobber the first 4k yet (BIOS NEEDS IT) */
171: /********************************************************/
172: read(tmpbuf,4096);
173: addr += 4096;
174: xread(addr, head.a_text - 4096);
175: addr += head.a_text - 4096;
176:
177: /********************************************************/
178: /* Load the Initialised data after the text */
179: /********************************************************/
180: while (addr & CLOFSET)
181: *(char *)addr++ = 0;
182:
183: printf(" data=0x%x", head.a_data);
184: xread(addr, head.a_data);
185: addr += head.a_data;
186:
187: /********************************************************/
188: /* Skip over the uninitialised data */
189: /* (but clear it) */
190: /********************************************************/
191: printf(" bss=0x%x", head.a_bss);
192: if( (addr < ouraddr) && ((addr + head.a_bss) > ouraddr))
193: {
194: pbzero(addr,ouraddr - (int)addr);
195: }
196: else
197: {
198: pbzero(addr,head.a_bss);
199: }
200: argv[3] = (addr += head.a_bss);
201:
202: #ifdef LOADSYMS /* not yet, haven't worked this out yet */
203: if (addr > 0x100000)
204: {
205: /********************************************************/
206: /*copy in the symbol header */
207: /********************************************************/
208: pcpy(&head.a_syms, addr, sizeof(head.a_syms));
209: addr += sizeof(head.a_syms);
210:
211: /********************************************************/
212: /* READ in the symbol table */
213: /********************************************************/
214: printf(" symbols=[+0x%x", head.a_syms);
215: xread(addr, head.a_syms);
216: addr += head.a_syms;
217:
218: /********************************************************/
219: /* Followed by the next integer (another header) */
220: /* more debug symbols? */
221: /********************************************************/
222: read(&i, sizeof(int));
223: pcpy(&i, addr, sizeof(int));
224: i -= sizeof(int);
225: addr += sizeof(int);
226:
227:
228: /********************************************************/
229: /* and that many bytes of (debug symbols?) */
230: /********************************************************/
231: printf("+0x%x]", i);
232: xread(addr, i);
233: addr += i;
234: }
235: #endif LOADSYMS
236: /********************************************************/
237: /* and note the end address of all this */
238: /********************************************************/
239:
240: argv[4] = ((addr+sizeof(int)-1))&~(sizeof(int)-1);
241: printf(" total=0x%x",argv[4]);
242:
243:
244: /*
245: * We now pass the various bootstrap parameters to the loaded
246: * image via the argument list
247: * (THIS IS A BIT OF HISTORY FROM MACH.. LEAVE FOR NOW)
248: * arg1 = boot flags
249: * arg2 = boot device
250: * arg3 = start of symbol table (0 if not loaded)
251: * arg4 = end of symbol table (0 if not loaded)
252: * arg5 = transfer address from image
253: * arg6 = transfer address for next image pointer
254: */
255: switch(maj)
256: {
257: case 2:
258: printf("\n\nInsert file system floppy \n");
259: getchar();
260: break;
261: case 4:
262: break;
263: }
264: argv[1] = howto;
265: argv[2] = (MAKEBOOTDEV(maj, 0, 0, unit, part)) ;
266: argv[5] = (head.a_entry &= 0xfffffff);
267: argv[6] = (int) &x_entry;
268: argv[0] = 8;
269: /****************************************************************/
270: /* copy that first page and overwrite any BIOS variables */
271: /****************************************************************/
272: printf(" entry point=0x%x \n" ,((int)startaddr) & 0xffffff);
273: pcpy(tmpbuf, 0, 4096);
274: startprog(((int)startaddr & 0xffffff),argv);
275: }
276:
277: char namebuf[100];
278: getbootdev(howto)
279: int *howto;
280: {
281: char c, *ptr = namebuf;
282: printf("Boot: [[[%s(%d,%c)]%s][-s][-a][-d]] :- "
283: , devs[maj]
284: , unit
285: , 'a'+part
286: , name);
287: if (gets(namebuf)) {
288: while (c=*ptr) {
289: while (c==' ')
290: c = *++ptr;
291: if (!c)
292: return;
293: if (c=='-')
294: while ((c = *++ptr) && c!=' ')
295: switch (c) {
296: case 'a':
297: *howto |= RB_ASKNAME; continue;
298: case 's':
299: *howto |= RB_SINGLE; continue;
300: case 'd':
301: *howto |= RB_KDB; continue;
302: case 'b':
303: *howto |= RB_HALT; continue;
304: }
305: else {
306: name = ptr;
307: while ((c = *++ptr) && c!=' ');
308: if (c)
309: *ptr++ = 0;
310: }
311: }
312: }
313: }
314:
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