Initial /boot stuff (from Mickey)

1 files changed, 139 insertions, 0 deletions

diff --git a/sys/arch/i386/stand/libsa/srt0.S b/sys/arch/i386/stand/libsa/srt0.S
new file mode 100644
index 00000000000..e0c94c975eb
--- /dev/null
+++ b/sys/arch/i386/stand/libsa/srt0.S
@@ -0,0 +1,139 @@
+/*	$OpenBSD: srt0.S,v 1.2 1997/03/31 03:12:16 weingart Exp $	*/
+/*	$NetBSD: srt0.c,v 1.3 1994/10/27 04:21:59 cgd Exp $	*/
+
+/*-
+ * 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.
+ *
+ *	@(#)srt0.c	5.3 (Berkeley) 4/28/91
+ */
+
+/*
+ * Startup code for standalone system
+ * Non-relocating version -- for programs which are loaded by boot
+ * Relocating version for boot
+ * Small relocating version for "micro" boot
+ */
+
+#include <machine/psl.h>
+
+	.globl	_end
+	.globl	_edata
+	.globl	_boot
+	.globl	__rtt
+	.globl	_bootdev
+	.globl	_boothowto
+	.globl	_cyloffset
+
+	.data
+	.globl	_Gdtr
+_Gdtr:
+	.long	0
+	.word	0
+_bootdev:	.long	0
+_boothowto:	.long	0
+_cyloffset:	.long	0
+_esym:		.long	0
+
+	.text
+
+#define	NOP	inb $0x84,%al ; inb $0x84,%al
+
+	.globl	start_boot
+
+start_boot:
+	pushl	%ebp
+	movl	%esp, %ebp
+
+	/* First, reset the PSL. */
+	pushl	$PSL_MBO
+	popfl
+
+	movl    8(%ebp), %eax
+	movl	%eax, _boothowto
+	movl    12(%ebp),%eax
+	movl    %eax, _bootdev
+	movl    16(%ebp),%eax
+	movl    %eax, _cyloffset
+	movl    20(%ebp),%eax
+	movl    %eax, _esym
+
+	/* save old stack state */
+	movl	%esp,savearea
+	movl	%ebp,savearea+4
+
+#if 0
+	/* setup stack pointer */
+	movl	_end, %eax
+	addl	$10000, %eax
+	movl	%eax, %esp
+
+	/* clear memory as needed */
+	movl	%esp,%esi
+	movl	$_edata,%edx
+
+	movl	%esp,%eax
+	subl	%edx,%eax
+	pushl	%edx
+	pushl	0
+	pushl	%esp
+	call	_memset
+
+	#call	_kbdreset	/* resets keyboard and gatea20 brain damage */
+	movl	%esi,%esp
+#endif
+	call	_boot
+	jmp	__rtt
+
+	.data
+
+savearea:	.long	0,0	# sp & bp to return to
+
+	.text
+
+__rtt:
+	movl	$-7,%eax
+#ifdef	REL
+#ifndef SMALL
+	call	_reset_cpu
+#endif
+	movw	$0x1234,%ax
+	movw	%ax,0x472	# warm boot
+	movl	$0,%esp		# segment violation
+	ret
+#else
+	movl	savearea,%esp
+	movl	savearea+4,%ebp
+	ret
+#endif