initial import of NetBSD tree

1 files changed, 231 insertions, 0 deletions

diff --git a/sys/arch/i386/netboot/asm.s b/sys/arch/i386/netboot/asm.s
new file mode 100644
index 00000000000..3fe9f70940f
--- /dev/null
+++ b/sys/arch/i386/netboot/asm.s
@@ -0,0 +1,231 @@
+/*	$NetBSD: asm.s,v 1.3 1994/10/27 04:21:05 cgd Exp $	*/
+
+/*
+ * source in this file came from
+ * the 386BSD boot blocks written by Julian Elischer.
+ *
+ * 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.
+*/
+
+/*-
+ * 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.
+ *
+ * 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.
+ */
+
+	.file "asm.s"
+
+#include "asm.h"
+
+	.text
+
+ENTRY(StartProg)
+	/* void StartProg(u_long phyaddr, u_long *args)
+	 * start the program in protected mode.  phyaddr is the entry point.
+	 */
+
+#ifndef USE_BUFFER
+	push	%ebp
+	mov	%esp, %ebp
+
+	# get things we need into registers
+	movl	0x8(%ebp), %ecx		# entry offset 
+	movl	0x0c(%ebp), %eax	# &argv
+
+	# make a new stack at 0:0xa0000 (big segs)
+	mov	$KERN_DATA_SEG, %ebx
+	movw	%bx, %ss
+	movl	$0xa0000,%ebx
+	movl	%ebx,%esp
+	
+	
+	# push some number of args onto the stack
+	pushl	$0			# nominally a cyl offset in the boot.
+	pushl	0x8(%eax)		# argv[2] = bootdev
+	pushl	0x4(%eax)		# argv[1] = howto
+	pushl	$0			# dummy 'return' address
+	
+	# push on our entry address
+	mov	$KERN_CODE_SEG, %ebx		# segment
+	pushl	%ebx
+	pushl	%ecx
+
+	# convert over the other data segs
+	mov	$KERN_DATA_SEG, %ebx
+	movw	%bx, %ds
+	movw	%bx, %es
+
+	# convert the PC (and code seg)
+	lret
+#else
+/* test version - relocating, kernel move (TBD) */
+	/* if necessary, move ourself out of the way
+	 * move the copy of the kernel to its correct load point
+	 * set up a stack and transfer args to it
+	 * call the entry point
+	 * this is best done in assembly as the potential relocation will
+	 * have a bad effect on non-PIC code.
+	 */
+	/* get things we need into registers */
+	movl	0x8(%ebp), %ecx		# entry offset 
+	movl	0x0c(%ebp), %eax	# &argv
+
+	/* relocate ourselves to <tmp_reloc_org> */
+	#  PhysBcopy(RELOC, tmp_reloc_org, WORK_AREA_SIZE);
+	mov	$RELOC, %esi
+	mov	$tmp_reloc_org, %edi
+	mov	$WORK_AREA_SIZE, %ecx
+	mov	%ds, %ax
+	mov	%ax, %es
+	rep
+	movsb
+
+	/* TBD - could probably also do this by munging a seg descriptor.
+	 * would it be easier?
+	 */
+	ljmp	$KERN_CODE_SEG, tmp_reloc_org+$1f
+1:
+	/* now we are PIC - caveats */
+	/* move the stack pointer to the new copy */
+	add	tmp_reloc_org-xxx, %esp
+
+	/* push some number of args onto the stack */
+	pushl	$0			# nominally a cyl offset in the boot.
+	pushl	0x8(%eax)		# argv[2] = bootdev
+	pushl	0x4(%eax)		# argv[1] = howto
+	pushl	$0			# dummy 'return' address
+	
+	/*  push on our entry address */
+	mov	$0x08, %ebx		# segment
+	pushl	%ebx
+	pushl	%ecx
+
+	/* copy loaded file to its destination (TBD) */
+	#  PhysBcopy(kcopy, korg, ksize);
+	mov	kern_copy_org, %esi
+	mov	boot_area_org, %edi
+	mov	xxxksize, %ecx
+	mov	%ds, %ax
+	mov	%ax, %es
+	rep
+	movsb	
+
+	/* convert the PC (and code seg) */
+	lret
+#endif
+
+
+/*
+ * C library -- _setjmp, _longjmp
+ *
+ *	longjmp(a,v)
+ * will generate a "return(v)" from the last call to
+ *	setjmp(a)
+ * by restoring registers from the stack.
+ * The previous signal state is restored.
+ */
+
+ENTRY(setjmp)
+	movl	4(%esp),%ecx 
+	movl	0(%esp),%edx
+	movl	%edx, 0(%ecx)
+	movl	%ebx, 4(%ecx)
+	movl	%esp, 8(%ecx)
+	movl	%ebp,12(%ecx)
+	movl	%esi,16(%ecx)
+	movl	%edi,20(%ecx)
+	movl	%eax,24(%ecx)
+	movl	$0,%eax
+	ret
+
+ENTRY(longjmp)
+	movl	4(%esp),%edx
+	movl	8(%esp),%eax
+	movl	0(%edx),%ecx
+	movl	4(%edx),%ebx
+	movl	8(%edx),%esp
+	movl	12(%edx),%ebp
+	movl	16(%edx),%esi
+	movl	20(%edx),%edi
+	cmpl	$0,%eax
+	jne	1f
+	movl	$1,%eax
+1:	movl	%ecx,0(%esp)
+	ret