/*      $NetBSD: biosrw.s,v 1.2 2025/11/19 09:43:27 nia Exp $   */

/*
 * Copyright (c) 1995 Waldi Ravens.
 * All rights reserved.
 *
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/* int  bios_read(buffer, offset, count, dev)   */

        .globl  _bios_read
        .text
        .even

_bios_read:
        movml   d1-d2/a1-a2,sp@-
        movl    sp@(24),sp@-            | offset
        movw    sp@(38),sp@-            | device
        movw    #-1,sp@-
        movw    sp@(38),sp@-            | count
        movl    sp@(30),sp@-            | buffer
        movw    #8,sp@-                 | read, physical mode
        movw    #4,sp@-
        trap    #13                     | Rwabs()
        lea     sp@(18),sp
        movml   sp@+,d1-d2/a1-a2
        rts

/* int  bios_write(buffer, offset, count, dev)  */

        .globl  _bios_write
        .text
        .even

_bios_write:
        movml   d1-d2/a1-a2,sp@-
        movl    sp@(20),sp@-            | offset
        movw    sp@(34),sp@-            | device
        movw    #-1,sp@-
        movw    sp@(34),sp@-            | count
        movl    sp@(26),sp@-            | buffer
        movw    #9,sp@-                 | write, physical mode
        movw    #4,sp@-
        trap    #13                     | Rwabs()
        lea     sp@(18),sp
        movml   sp@+,d1-d2/a1-a2
        rts

/* int  bios_critic(error)                      */

        .globl  _bios_critic
        .text
        .even

_bios_critic:
        movw    sp@(4),d0
        extl    d0
        rts