1 files changed, 120 insertions, 0 deletions
diff --git a/sys/boot/i386/libi386/startprog.S b/sys/boot/i386/libi386/startprog.S
new file mode 100644
index 0000000..348341f
--- /dev/null
+++ b/sys/boot/i386/libi386/startprog.S
@@ -0,0 +1,120 @@
+/*	$NetBSD: startprog.S,v 1.1.1.1 1997/03/14 02:40:33 perry Exp $	*/
+	
+/* starts program in protected mode / flat space
+ with given stackframe
+ needs global variables flatcodeseg and flatdataseg
+ (gdt offsets)
+  derivied from: NetBSD:sys/arch/i386/boot/asm.S
+ */
+
+/*
+ * Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
+ *
+ * Mach Operating System
+ * Copyright (c) 1992, 1991 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+/*
+  Copyright 1988, 1989, 1990, 1991, 1992 
+   by Intel Corporation, Santa Clara, California.
+
+                All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appears in all
+copies and that both the copyright notice and this permission notice
+appear in supporting documentation, and that the name of Intel
+not be used in advertising or publicity pertaining to distribution
+of the software without specific, written prior permission.
+
+INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
+IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
+NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include <machine/asm.h>
+
+/*
+ * startprog(phyaddr,argc,argv,stack)
+ *	start the program on protected mode where phyaddr is the entry point
+ */
+ENTRY(startprog)
+	pushl	%ebp
+	movl	%esp, %ebp
+
+	# prepare a new stack
+	movl	$flatdataseg, %ebx
+	movw	%bx, %es		# for arg copy
+	movl	20(%ebp), %eax	# stack
+	subl	$4,%eax
+	movl	%eax, %edi
+	
+	# push some number of args onto the stack
+	movl	12(%ebp), %ecx		# argc
+
+	movl	%ecx, %eax
+	decl	%eax
+	shl	$2, %eax
+	addl	16(%ebp), %eax	# ptr to last arg
+	movl	%eax, %esi
+
+	std			# backwards
+	rep
+	movsl
+
+	cld		# LynxOS depends on it
+
+	movl	8(%ebp), %ecx	# entry
+
+	# set new stackptr (movsl decd sp 1 more -> dummy return address)
+	movw	%bx, %ss
+	movl	%edi, %esp
+
+	# plug in a return address so that FreeBSD detects we are using
+	# bootinfo
+	movl	$ourreturn, %eax
+	movl	%eax, (%esp)
+
+	# push on our entry address
+	movl	$flatcodeseg, %ebx		# segment
+	pushl	%ebx
+	pushl	%ecx			#entry
+
+	# convert over the other data segs
+	movl	$flatdataseg, %ebx
+	movl	%bx, %ds
+	movl	%bx, %es
+
+	# convert the PC (and code seg)
+	lret
+
+ourreturn:
+	/* For now there is not much we can do, just lock in a loop */
+	jmp	ourreturn
+