Initial /boot stuff (from Mickey)

1 files changed, 208 insertions, 0 deletions

diff --git a/sys/arch/i386/stand/libsa/bioscom.S b/sys/arch/i386/stand/libsa/bioscom.S
new file mode 100644
index 00000000000..f8402007401
--- /dev/null
+++ b/sys/arch/i386/stand/libsa/bioscom.S
@@ -0,0 +1,208 @@
+/*	$OpenBSD: bioscom.S,v 1.2 1997/03/31 03:12:09 weingart Exp $	*/
+
+/*
+ * 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.
+ *
+ *	from: Mach, Revision 2.2  92/04/04  11:34:26  rpd
+ *	$Id: bioscom.S,v 1.2 1997/03/31 03:12:09 weingart Exp $
+ */
+
+/*
+  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.
+*/
+
+/*
+ * Serial bootblock interface routines
+ * Copyright (c) 1994, J"org Wunsch
+ *
+ * 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.
+ *
+ * THE AUTHOR ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  THE AUTHOR DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ */ 
+
+	.file	"serial.s"
+
+#include <machine/asm.h>
+
+port:
+	.long	0x3f8
+
+	.text
+
+/*
+ * The serial port interface routines implement a simple polled i/o
+ * interface to a standard serial port.  Due to the space restrictions
+ * for the boot blocks, no BIOS support is used (since BIOS requires
+ * expensive real/protected mode switches), instead the rudimentary
+ * BIOS support is duplicated here.
+ *
+ * The base address for the i/o port is stored in 'port' variable upon
+ * probing for device.  Console parameters are currently
+ * hard-coded to 9600 Bd, 8 bit.  This can be changed in the
+ * init_serial() function.
+ */
+
+/*
+ * int com_probe();
+ *	probe com[0-3] ports and store first found in 'port' variable
+ */
+ENTRY(com_probe)
+	push	%ebp
+	mov	%esp, %ebp
+
+	/*
+	 * void init_serial(void)
+	 * 	initialize the serial console port to 9600 Bd, 8 bpc
+	 */
+	movl	$port, %edx	# line control reg
+	addb	5, %dl
+	movl	$0x80, %eax
+	outb	%al, %dx	# enable DLAB
+
+	subb	$3, %dl		# divisor latch, low byte
+	movb	$12, %al	# divisor 12: 9600 Bd
+	outb	%al, %dx
+	incl	%edx		# divisor latch, high byte
+	movb	%ah, %al
+	outb	%al, %dx
+
+	addb	$2, %dl		# line control reg
+	movb	$0x13, %al
+	outb	%al, %dx	# 8 bit, no parity, 1 stop bit
+
+	incl	%edx		# modem control reg
+	movb	$3, %al
+	outb	%al, %dx	# enable DTR/RTS
+
+	/* now finally, flush the input buffer */
+	incl	%edx		# line status reg
+1:
+	inb	%dx, %al
+	testb	$0x01, %al
+	jz	2f		# no more characters buffered
+	subb	$5, %dl		# rx buffer reg
+	inb	%dx, %al	# throw away
+	addb	$5, %dl
+	jmp	1b
+2:
+	xorl	%eax, %eax	# is present (:
+	incl	%eax
+	popl	%ebp
+	ret
+
+/*
+ * void com_putc(ch) char ch;
+ *	send ch to serial port
+ *
+ */
+
+ENTRY(com_putc)
+	pushl	%ebp
+	movl	%esp, %ebp
+
+	movl	$port, %edx	# line status reg
+	add	5, %edx
+1:	inb	%dx, %al
+	test	$0x20, %al
+	jz	1b		# TX buffer not empty
+
+	movb	8(%ebp), %al
+
+	sub	$5, %edx	# TX output reg
+	outb	%al, %dx	# send this one
+
+	popl	%ebp
+	ret
+
+/*
+ * int com_getc(void)
+ *	read a character from serial port
+ */
+
+ENTRY(com_getc)
+	push	%ebp
+	movl	%esp, %ebp
+
+	movl	$port, %edx	# line status reg
+	addl	5, %edx
+1:
+	inb	%dx, %al
+	testb	$0x01, %al
+	jz	1b		# no RX char available
+
+	xorl	%eax, %eax
+	subl	$5, %edx	# RX buffer reg
+	inb	%dx, %al	# fetch (first) character
+
+	andb	$0x7F, %eax	# remove any parity bits we get
+	cmpb	$0x7F, %eax	# make DEL...
+	jne	2f
+	movb	$0x08, %eax	# look like BS
+2:
+	popl	%ebp
+	ret
+
+/*
+ * int com_ischar(void)
+ *       if there is a character pending, return true; otherwise return 0
+ */
+ENTRY(com_ischar)
+	push	%ebp
+	mov	%esp, %ebp
+
+	xorl	%eax, %eax
+	movl	$port, %edx	# line status reg
+	addl	5, %edx
+	inb	%dx, %al
+	andb	$0x01, %al		# RX char available?
+
+	pop	%ebp
+	ret
+