NetBSD/sys/arch/i386/stand/lib/exec_fromdos.c

346 lines
8.4 KiB
C

/* $NetBSD: exec_fromdos.c,v 1.6 1997/11/03 18:06:22 drochner Exp $ */
/*
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1996
* Matthias Drochner. All rights reserved.
* Copyright (c) 1996
* Perry E. Metzger. All rights reserved.
* Copyright (c) 1997
* Martin Husemann. 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* @(#)boot.c 8.1 (Berkeley) 6/10/93
*/
/*
* starts NetBSD a.out kernel
* needs lowlevel startup from startprog.S
* This is a special version of exec.c to support use of XMS.
*/
#include <sys/param.h>
#include <sys/exec_aout.h>
#include <sys/reboot.h>
#ifdef COMPAT_OLDBOOT
#include <sys/disklabel.h>
#endif
#include <lib/libsa/stand.h>
#include "libi386.h"
#include "bootinfo.h"
#ifdef COMPAT_OLDBOOT
static int
dev2major(devname, major)
char *devname;
int *major;
{
static char *devices[] = {"wd", "", "fd", "", "sd"};
#define NUMDEVICES (sizeof(devices)/sizeof(char *))
int i;
for (i = 0; i < NUMDEVICES; i++)
if (!strcmp(devname, devices[i])) {
*major = i;
return (0);
}
return (-1);
}
#endif
extern struct btinfo_console btinfo_console;
int
exec_netbsd(file, loadaddr, boothowto)
const char *file;
physaddr_t loadaddr;
int boothowto;
{
register int io;
struct exec x;
int cc, magic;
physaddr_t entry;
register physaddr_t cp;
u_long boot_argv[6];
u_long extmem;
#ifdef XMS
u_long xmsmem;
physaddr_t tmpbuf = 0;
physaddr_t origadr = 0;
#endif
#ifdef COMPAT_OLDBOOT
char *fsname, *devname;
int unit, part;
const char *filename;
int bootdevnr;
#endif
#ifdef DEBUG
printf("exec: file=%s loadaddr=0x%lx\n", file, loadaddr);
#endif
BI_ALLOC(5); /* ??? */
BI_ADD(&btinfo_console, BTINFO_CONSOLE, sizeof(struct btinfo_console));
io = open(file, 0);
if (io < 0)
goto out;
/*
* Read in the exec header, and validate it.
*/
if (read(io, (char *) &x, sizeof(x)) != sizeof(x))
goto shread;
magic = N_GETMAGIC(x);
if ((magic != ZMAGIC) || (N_GETMID(x) != MID_MACHINE)) {
#ifdef DEBUG
printf("invalid NetBSD kernel (%o/%d)\n", magic, N_GETMID(x));
#endif
errno = EFTYPE;
goto closeout;
}
entry = x.a_entry & 0xffffff;
if (!loadaddr)
loadaddr = (entry & 0x100000);
cp = loadaddr;
extmem = getextmem();
#ifdef XMS
if ((getextmem1() == 0) && (xmsmem = checkxms())) {
u_long kernsize;
/*
* With "CONSERVATIVE_MEMDETECT", extmem is 0 because
* getextmem() is getextmem1(). Without, the "smart"
* methods could fail to report all memory as well.
* xmsmem is a few kB less than the actual size, but
* better than nothing.
*/
if (xmsmem > extmem)
extmem = xmsmem;
/* Approximate a size for the temporary buffer needed.
* Can't calculate the real size right now because we don't
* yet know the size of the stringtable. Overrunning the
* temporary buffer doesn't break anything but DOS - which
* isn't needed at that time any more. Usualy it even doesn't
* harm DOS, because our buffer was the latest allocated and
* is followed by free memory. */
kernsize = x.a_text + x.a_data + x.a_bss + sizeof(x.a_syms);
if (x.a_syms > 0)
kernsize += x.a_syms + sizeof(cc);
/* add a little for the string table, convert to kB rounding
* up... */
kernsize += (x.a_text + x.a_data) / 6;
kernsize = (kernsize + 1023) / 1024;
tmpbuf = xmsalloc(kernsize);
if (!tmpbuf)
return(ENOMEM);
origadr = cp;
cp = tmpbuf;
}
#endif
/*
* Leave a copy of the exec header before the text.
* The kernel may use this to verify that the
* symbols were loaded by this boot program.
*/
vpbcopy(&x, cp, sizeof(x));
cp += sizeof(x);
/*
* Read in the text segment.
*/
printf("%ld", x.a_text);
if (pread(io, cp, x.a_text - sizeof(x)) != x.a_text - sizeof(x))
goto shread;
cp += x.a_text - sizeof(x);
/*
* Read in the data segment.
*/
printf("+%ld", x.a_data);
if (pread(io, cp, x.a_data) != x.a_data)
goto shread;
cp += x.a_data;
/*
* Zero out the BSS section.
* (Kernel doesn't care, but do it anyway.)
*/
printf("+%ld", x.a_bss);
pbzero(cp, x.a_bss);
cp += x.a_bss;
/*
* Read in the symbol table and strings.
* (Always set the symtab size word.)
*/
vpbcopy(&x.a_syms, cp, sizeof(x.a_syms));
cp += sizeof(x.a_syms);
if (x.a_syms > 0) {
/* Symbol table and string table length word. */
printf("+[%ld", x.a_syms);
if (pread(io, cp, x.a_syms) != x.a_syms)
goto shread;
cp += x.a_syms;
read(io, &cc, sizeof(cc));
vpbcopy(&cc, cp, sizeof(cc));
cp += sizeof(cc);
/* String table. Length word includes itself. */
printf("+%d]", cc);
cc -= sizeof(int);
if (cc <= 0)
goto shread;
if (pread(io, cp, cc) != cc)
goto shread;
cp += cc;
}
#ifdef XMS
if (tmpbuf) {
/* cp points into tmpbuf, convert end address to physical address */
boot_argv[3] = (((u_int) (cp - tmpbuf + loadaddr) + sizeof(int) - 1)) & (-sizeof(int));
printf("=0x%lx\n", cp - tmpbuf);
} else {
#endif
boot_argv[3] = (((u_int) cp + sizeof(int) - 1)) & (-sizeof(int));
printf("=0x%lx\n", cp - loadaddr);
#ifdef XMS
}
#endif
boot_argv[0] = boothowto;
#ifdef COMPAT_OLDBOOT
/* prepare boot device information for kernel */
if (parsebootfile(file, &fsname, &devname, &unit, &part, &filename)
|| strcmp(fsname, "ufs"))
bootdevnr = 0; /* XXX error out if parse error??? */
else {
int major;
if (strcmp(devname, "hd") == 0) {
/* generic BIOS disk, have to guess type */
struct open_file *f = &files[io]; /* XXX */
if (biosdisk_gettype(f) == DTYPE_SCSI)
devname = "sd";
else
devname = "wd";
/*
* The old boot block performed the following
* conversion:
*
* hdN -> Xd0
*
* where X is the type specified by the label.
* We mimmick that here, for lack of any better
* way of doing things.
*/
unit = 0;
}
if (dev2major(devname, &major))
bootdevnr = 0; /* XXX error out??? */
else
bootdevnr = MAKEBOOTDEV(major, 0, 0, unit, part);
}
boot_argv[1] = bootdevnr;
#else
boot_argv[1] = 0;
#endif
#ifdef PASS_BIOSGEOM
bi_getbiosgeom();
#endif
boot_argv[2] = vtophys(bootinfo); /* old cyl offset */
/*
* boot_argv[3] = end (set above)
*/
boot_argv[4] = extmem;
boot_argv[5] = getbasemem();
close(io);
#ifdef DEBUG
printf("Start @ 0x%lx ...\n", entry);
#endif
#ifdef XMS
if (tmpbuf) {
/*
* We know have done our last DOS IO, so we may
* trash the OS. Copy the data from the temporary
* buffer to its real adress.
*/
ppbcopy(tmpbuf, origadr, cp - tmpbuf);
}
#endif
startprog(entry, 6, boot_argv, 0x90000);
panic("exec returned");
shread:
printf("exec: short read\n");
errno = EIO;
closeout:
close(io);
out:
BI_FREE();
bootinfo = 0;
return (-1);
}