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/* $NetBSD: boot.c,v 1.1.1.1 1995/10/13 21:27:30 gwr Exp $ */
/*
* Copyright (c) 1994 Paul Kranenburg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Paul Kranenburg.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This is a generic "first-stage" boot program.
*
* Note that this program has absolutely no filesystem knowledge!
*
* Instead, this uses a table of disk block numbers that are
* filled in by the installboot program such that this program
* can load the "second-stage" boot program.
*/
#include <sys/param.h>
#include <sys/reboot.h>
#include <sys/exec.h>
#include <machine/mon.h>
#include "stand.h"
#include "promboot.h"
/*
* Boot device is derived from ROM provided information.
*/
#define LOADADDR 0x4000
extern int debug;
extern char *version;
char line[80];
int block_size = 512;
main()
{
struct open_file f;
struct bootparam *bp;
void (*entry)();
char *addr;
int n, error;
printf(">> NetBSD tapeboot [%s]\n", version);
prom_get_boot_info();
/*
* Set the tape file number to the next one, because
* the boot program is first, then the kernel.
*/
bp = *romp->bootParam;
bp->partNum += 1;
for (;;) {
if (prom_boothow & RB_ASKNAME) {
printf("tapeboot: segment? [%d] ", bp->partNum);
gets(line);
if (('0' <= line[0]) && (line[0] <= '9')) {
bp->partNum = line[0] - '0';
}
}
printf("tapeboot: opening segment %d\n", bp->partNum);
f.f_flags = F_RAW;
if ((error = devopen(&f, 0, &addr)) != 0) {
printf("tapeboot: open failed, error=%d\n", error);
goto ask;
}
addr = (char*)LOADADDR;
error = loadfile(&f, addr);
printf("tapeboot: close (rewind)...\n");
f.f_dev->dv_close(&f);
if (error == 0)
break;
printf("tapeboot: load failed, error=%d\n", error);
ask:
prom_boothow |= RB_ASKNAME;
}
if (debug) {
printf("Debug mode - enter c to continue...");
/* This will print "\nAbort at ...\n" */
asm(" trap #0");
}
printf("Starting program at 0x%x\n", (long)addr);
entry = (void (*)())addr;
(*entry)();
}
int
loadfile(fp, addr)
struct open_file *fp;
char *addr;
{
char *buf;
int n, blknum;
int error = 0;
/*
* Loading a kernel. It WILL have an a.out header.
* XXX - This assumes OMAGIC format!
*/
addr -= sizeof(struct exec); /* XXX */
/* Need to use a buffer that can be mapped into DVMA space. */
buf = alloc(block_size);
if (!buf)
panic("tapeboot: alloc failed");
printf("tapeboot: loading ... ");
/* limit program size to < 2MB */
for (blknum = 0; blknum < 4096; blknum++) {
error = (fp->f_dev->dv_strategy)(fp->f_devdata, F_READ,
blknum, block_size, buf, &n);
if (error) {
printf("(error=%d)\n", error);
return EIO;
}
if (n == 0)
break; /* end of tape */
if (n != block_size) {
printf(" (short read)\n");
return EIO;
}
bcopy(buf, addr, block_size);
addr += block_size;
}
printf("(%d blocks)\n", blknum);
return 0;
}
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