hvconsole.c

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/*
 * hvconsole.c
 * Copyright (C) 2004 Hollis Blanchard, IBM Corporation
 * Copyright (C) 2004 IBM Corporation
 *
 * Additional Author(s):
 *  Ryan S. Arnold <[email protected]>
 *
 * LPAR console support.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/errno.h>
#include <asm/hvcall.h>
#include <asm/hvconsole.h>
#include "plpar_wrappers.h"

int hvc_get_chars(uint32_t vtermno, char *buf, int count)
{
    unsigned long got;

    if (plpar_get_term_char(vtermno, &got, buf) == H_SUCCESS)
        return got;

    return 0;
}

EXPORT_SYMBOL(hvc_get_chars);


int hvc_put_chars(uint32_t vtermno, const char *buf, int count)
{
    unsigned long *lbuf = (unsigned long *) buf;
    long ret;


    /* hcall will ret H_PARAMETER if 'count' exceeds firmware max.*/
    if (count > MAX_VIO_PUT_CHARS)
        count = MAX_VIO_PUT_CHARS;

    ret = plpar_hcall_norets(H_PUT_TERM_CHAR, vtermno, count, lbuf[0],
                 lbuf[1]);
    if (ret == H_SUCCESS)
        return count;
    if (ret == H_BUSY)
        return -EAGAIN;
    return -EIO;
}

EXPORT_SYMBOL(hvc_put_chars);