i386/91871: boot1: jump to 0xf000:0xfff0 instead of 0xffff:0x0 when rebooting the machine

[Björn König]

>Number:         91871
>Category:       i386
>Synopsis:       boot1: jump to 0xf000:0xfff0 instead of 0xffff:0x0 when rebooting the machine
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jan 16 14:30:07 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Björn König
>Release:        
>Organization:
>Environment:
>Description:
	There was a small discussion (*) on the hackers mailing list in november 2003
	where you deceided to use 0xf000:0xfff0 instead of 0xffff:0x0 in
	src/sys/boot/i386/btx/btx/btx.S (1.33) to jump to the reboot handler.

	For consistency you should use the same method in boot1.S.
	
	*) Subject: BTX loader reboot on Soekris comBIOS1.22 fails (patches for btx.s and loader/main.c enclosed)
>How-To-Repeat:
>Fix:

--- boot1.S-20060116.diff begins here ---
--- src/sys/boot/i386/boot2/boot1.S.orig	Sat Aug 28 10:32:23 2004
+++ src/sys/boot/i386/boot2/boot1.S	Mon Jan 16 15:13:14 2006
@@ -240,7 +240,7 @@
 		xorb %ah,%ah			# BIOS: Get
 		int $0x16			#  keypress
 		movw $0x1234, BDA_BOOT		# Do a warm boot
-		ljmp $0xffff,$0x0		# reboot the machine
+		ljmp $0xf000,$0xfff0		# reboot the machine
 /*
  * Display a null-terminated string using the BIOS output.
  */
--- boot1.S-20060116.diff ends here ---


>Release-Note:
>Audit-Trail:
>Unformatted: