obp/tools/promif/common/prom_console.c

/*
* ========== Copyright Header Begin ==========================================
*
* Hypervisor Software File: prom_console.c
*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
*  - Do no alter or remove copyright notices
*
*  - Redistribution and use of this software in source and binary forms, with
*    or without modification, are permitted provided that the following
*    conditions are met:
*
*  - Redistribution of source code must retain the above copyright notice,
*    this list of conditions and the following disclaimer.
*
*  - Redistribution 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.
*
*    Neither the name of Sun Microsystems, Inc. or the names of contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
*     This software is provided "AS IS," without a warranty of any kind.
* ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN
* OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
* FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or
* intended for use in the design, construction, operation or maintenance of
* any nuclear facility.
*
* ========== Copyright Header End ============================================
*/
/*
 * Copyright (c) 2000-2003 Sun Microsystems, Inc.
 * All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "@(#)prom_console.c     1.1     00/08/07 SMI"

#include <sys/promif.h>
#include <sys/promimpl.h>

/*
 * Return ihandle of stdin
 */
ihandle_t
prom_stdin_ihandle(void)
{
        static ihandle_t istdin = 0;
        static char *name = "stdin";

        if (istdin)
                return (istdin);

        if (prom_getproplen(prom_chosennode(), name) != sizeof (ihandle_t)) {
                return (istdin = (ihandle_t)-1);
        }

        (void) prom_getprop(prom_chosennode(), name, (caddr_t)(&istdin));
        istdin = prom_decode_int(istdin);

        return (istdin);
}

/*
 * Return ihandle of stdout
 */
ihandle_t
prom_stdout_ihandle(void)
{
        static ihandle_t istdout = 0;
        static char *name = "stdout";

        if (istdout)
                return (istdout);

        if (prom_getproplen(prom_chosennode(), name) != sizeof (ihandle_t))  {
                return (istdout = (ihandle_t)-1);
        }

        (void) prom_getprop(prom_chosennode(), name, (caddr_t)(&istdout));
        istdout = prom_decode_int(istdout);
        return (istdout);
}

uchar_t
prom_getchar(void)
{
        int32_t c;

        while ((c = prom_mayget()) == -1)
                ;
        return ((uchar_t)c);
}

int
prom_mayget(void)
{
        uint32_t rv;
        char c;

        rv = prom_read(prom_stdin_ihandle(), &c, 1);
        return (rv == 1 ? (int)c : -1);
}

void
prom_putchar(char c)
{
        while (prom_mayput(c) == -1)
                ;
}

int
prom_mayput(char c)
{
        /*
         * prom_write returns the number of bytes that were written
         */
        if (prom_write(prom_stdout_ihandle(), &c, 1) > 0)
                return (0);
        else
                return (-1);
}