/*      $NetBSD: consio.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.
 */

#include <machine/asm.h>

ENTRY_NOPROFILE(getchar)        | int getchar (void);
        movml   %d2/%a2,%sp@-
        movw    #2,%sp@-        | BIOS device 2 => console (VT52)
        movw    #2,%sp@-        | BIOS opcode 2 => Bconin
        trap    #13             | => char in d0.b
        addql   #4,%sp
        andl    #0xff,%d0
        movml   %sp@+,%d2/%a2
        rts

ENTRY_NOPROFILE(putchar)        | void putchar (int c);
        movl    %sp@(4),%d0
        cmpw    #10,%d0         | linefeed?
        bnes    0f
        movq    #13,%d0         | yes, put CR and LF.
        bsrs    0f
        movq    #10,%d0
0:      movml   %d2/%a2,%sp@-
        movw    %d0,%sp@-       | character
        movw    #2,%sp@-        | BIOS device 2 => console (VT52)
        movw    #3,%sp@-        | BIOS opcode 3 => Bconout
        trap    #13             | => none
        addql   #6,%sp
        movml   %sp@+,%d2/%a2
        rts