From 0a5cfe207a8965880b7d0546d140d6d0db5c9e1a Mon Sep 17 00:00:00 2001
From: William Nesheim <william@ucbvax.Berkeley.EDU>
Date: Wed, 25 Apr 1990 02:56:22 -0800
Subject: [PATCH] date and time created 90/04/24 19:56:22 by william

SCCS-vsn: sys/i386/stand/bootxx.c 7.1
---
 usr/src/sys/i386/stand/bootxx.c | 105 ++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 usr/src/sys/i386/stand/bootxx.c

diff --git a/usr/src/sys/i386/stand/bootxx.c b/usr/src/sys/i386/stand/bootxx.c
new file mode 100644
index 0000000000..9b11fc8964
--- /dev/null
+++ b/usr/src/sys/i386/stand/bootxx.c
@@ -0,0 +1,105 @@
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * William Jolitz.
+ *
+ * %sccs.include.noredist.c%
+ *
+ *	@(#)bootxx.c	7.1 (Berkeley) %G%
+ */
+
+#include "../h/param.h"
+#include "../h/inode.h"
+#include "../h/fs.h"
+#include <a.out.h>
+#include "saio.h"
+#include "../h/reboot.h"
+#include "../h/dir.h"
+#include "../h/disk.h"
+#include "devvm.h"
+
+extern	int howto, bootdev, unit, cyloffset, boottype;
+extern char bootprog[] ;
+/*
+ * Boot program... arguments passed in r10 and r11
+ * are passed through to the full boot program.
+ */
+
+main()
+{
+	register int io, partition; register char *bp ;
+
+#ifdef lint
+	howto = 0; devtype = 0;
+#endif
+	extern struct disklabel disklabel;
+
+	/* are we a disk, if so look at disklabel and do things */
+	if (bootdev == 0 || bootdev == 3) {
+	    /*
+	     * Synthesize bootdev from unit, type and partition
+	     * from the ROM monitor.
+	     * It's dirty work, but someone's got to do it, and
+	     * we always seem to get it.
+	     */
+	    for (io = 0; io < 8; io++)
+		if (bootdev > 0) { /* XXX should check dk_type == DTYPE_SCSI */
+			if (disklabel.dk_partition[io].cyloff
+				== cyloffset * disklabel.dk_secpercyl)
+				break;
+		} else {
+	
+			if (disklabel.dk_partition[io].cyloff == cyloffset)
+			break;
+		}
+	    if (io == 8) io = 0; /* probably a bad or non-existant disklabel */
+	    bootdev = makedev(bootdev, make_minor(unit, io));
+	} else { io = 0 ; howto = (howto&0x7) | 3 ; }
+	bp = bootprog ;
+	while (*bp != '0') bp++ ;	/* n-char device names instead of 2 */
+	*bp++ = unit % 10 + '0' ;
+	*bp += io % 10 ;
+/*	bootprog[3] = unit % 10 + '0';
+	bootprog[4] = io % 10 + 'a';*/
+	printf("loading %s\n", bootprog);
+	io = open(bootprog, 0);
+	if (io >= 0)
+		copyunix(io);
+	_stop("boot failed\n");
+}
+
+/*ARGSUSED*/
+copyunix(io)
+	register io;	
+{
+	struct exec x;
+	register int i;
+	char *addr;
+
+	i = read(io, (char *)&x, sizeof x);
+	if (i != sizeof x ||
+	    (x.a_magic != 0407 && x.a_magic != 0413 && x.a_magic != 0410))
+		_stop("Bad format\n");
+	if ((x.a_magic == 0413 || x.a_magic == 0410) &&
+	    lseek(io, 0x400, 0) == -1)
+		goto shread;
+	if (read(io, (char *)0, x.a_text) != x.a_text)
+		goto shread;
+	addr = (char *)x.a_text;
+	if (x.a_magic == 0413 || x.a_magic == 0410)
+		while ((int)addr & CLOFSET)
+			*addr++ = 0;
+	if (read(io, addr, x.a_data) != x.a_data)
+		goto shread;
+	addr += x.a_data;
+	x.a_bss += 128*512;	/* slop */
+	for (i = 0; i < x.a_bss; i++)
+		*addr++ = 0;
+	setregs();
+ 	(*((int (*)()) x.a_entry))();
+	return;
+shread:
+	_stop("Short read\n");
+}
-- 
2.20.1