common/kmdb/kmdb_promio.c

	kmdb_promio.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * PROM I/O backend
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/obpdefs.h>
#include <string.h>
#include <errno.h>

#include <mdb/mdb_modapi.h>
#include <mdb/mdb_io_impl.h>
#include <kmdb/kmdb_promif.h>
#include <kmdb/kmdb_io.h>
#include <mdb/mdb_debug.h>
#include <mdb/mdb_err.h>
#include <mdb/mdb.h>

#define PIO_FL_TIO_READ 0x001

typedef struct pio_data {
    char        pio_name[MAXPATHLEN];
    ihandle_t   pio_fd;
    uint_t      pio_flags;
    struct termios  pio_ti;
} pio_data_t;

static pid_t pio_pgrp;

static ssize_t
pio_read(mdb_io_t *io, void *buf, size_t nbytes)
{
    pio_data_t *pdp = io->io_data;

    if (io->io_next == NULL)
        return (kmdb_prom_read(buf, nbytes, &pdp->pio_ti));

    return (IOP_READ(io->io_next, buf, nbytes));
}

static ssize_t
pio_write(mdb_io_t *io, const void *buf, size_t nbytes)
{
    pio_data_t *pdp = io->io_data;

    if (io->io_next == NULL)
        return (kmdb_prom_write(buf, nbytes, &pdp->pio_ti));

    return (IOP_WRITE(io->io_next, buf, nbytes));
}

static off64_t
pio_seek(mdb_io_t *io, off64_t offset, int whence)
{
    if (io->io_next == NULL)
        return (set_errno(ENOTSUP));

    return (IOP_SEEK(io->io_next, offset, whence));
}

static int
pio_ctl(mdb_io_t *io, int req, void *arg)
{
    pio_data_t *pdp = io->io_data;

    if (io->io_next != NULL)
        return (IOP_CTL(io->io_next, req, arg));

    switch (req) {
    case TIOCGWINSZ:
        return (kmdb_prom_term_ctl(TIOCGWINSZ, arg));

    case TCGETS: {
        struct termios *ti = arg;

        if (!(pdp->pio_flags & PIO_FL_TIO_READ)) {
            (void) kmdb_prom_term_ctl(TCGETS, &pdp->pio_ti);
            pdp->pio_flags |= PIO_FL_TIO_READ;
        }

        bcopy(&pdp->pio_ti, ti, sizeof (struct termios));

        mdb_dprintf(MDB_DBG_CMDBUF, "pio_ctl: gets: i: 0%o o: 0%o c: "
            "0%o l: 0%o\n", ti->c_iflag, ti->c_oflag, ti->c_cflag,
            ti->c_lflag);
        return (0);
    }

    case TCSETSW: {
        struct termios *ti = arg;

        mdb_dprintf(MDB_DBG_CMDBUF, "pio_ctl: setsw: i: 0%o o: 0%o c: "
            "0%o l: 0%o\n", ti->c_iflag, ti->c_oflag, ti->c_cflag,
            ti->c_lflag);

        bcopy(ti, &pdp->pio_ti, sizeof (struct termios));

        return (0);
    }

    case TIOCSPGRP:
        pio_pgrp = *(pid_t *)arg;
        mdb_dprintf(MDB_DBG_CMDBUF, "pio_ctl: spgrp: %ld\n",
            (long)pio_pgrp);
        return (0);

    case TIOCGPGRP:
        mdb_dprintf(MDB_DBG_CMDBUF, "pio_ctl: gpgrp: %ld\n",
            (long)pio_pgrp);
        *(pid_t *)arg = pio_pgrp;
        return (0);

    case MDB_IOC_CTTY:
        mdb_dprintf(MDB_DBG_CMDBUF, "pio_ctl: ignoring MDB_IOC_CTTY\n");
        return (0);

    case MDB_IOC_GETFD:
        return (set_errno(ENOTSUP));

    default:
        warn("Unknown ioctl %d\n", req);
        return (set_errno(EINVAL));
    }
}

void
pio_close(mdb_io_t *io)
{
    pio_data_t *pdp = io->io_data;

    mdb_free(pdp, sizeof (pio_data_t));
}

static const char *
pio_name(mdb_io_t *io)
{
    pio_data_t *pdp = io->io_data;

    if (io->io_next == NULL)
        return (pdp->pio_name);

    return (IOP_NAME(io->io_next));
}

static const mdb_io_ops_t promio_ops = {
    pio_read,
    pio_write,
    pio_seek,
    pio_ctl,
    pio_close,
    pio_name,
    no_io_link,
    no_io_unlink,
    no_io_setattr,
    no_io_suspend,
    no_io_resume
};

mdb_io_t *
kmdb_promio_create(char *name)
{
    mdb_io_t *io;
    pio_data_t *pdp;
    ihandle_t hdl = kmdb_prom_get_handle(name);

    if (hdl == -1)
        return (NULL);

    io = mdb_zalloc(sizeof (mdb_io_t), UM_SLEEP);
    pdp = mdb_zalloc(sizeof (pio_data_t), UM_SLEEP);

    strlcpy(pdp->pio_name, name, MAXPATHLEN);
    pdp->pio_fd = hdl;

#ifdef __sparc
    pdp->pio_ti.c_oflag |= ONLCR;
    pdp->pio_ti.c_iflag |= ICRNL;
#endif
    pdp->pio_ti.c_lflag |= ECHO;

    io->io_data = pdp;
    io->io_ops = &promio_ops;

    return (io);
}