/*      $NetBSD: ofdev.c,v 1.19 2011/08/21 13:12:48 phx Exp $   */

/*
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 */
/*
 * Device I/O routines using Open Firmware
 */

#include "ofdev.h"

#include <sys/param.h>

#include <netinet/in.h>

#include <lib/libkern/libkern.h>

#include <lib/libsa/byteorder.h>
#include <lib/libsa/ufs.h>
#include <lib/libsa/cd9660.h>
#include <lib/libsa/dosfs.h>
#include <lib/libsa/nfs.h>

#include "net.h"
#include "openfirm.h"
#include "mbr.h"
#include "rdb.h"

extern char bootdev[];

#ifdef DEBUG
# define DPRINTF printf
#else
# define DPRINTF while (0) printf
#endif

static char *
filename(char *str, char *ppart)
{
        char *cp, *lp;
        char savec;
        int dhandle;
        char devtype[16];

        lp = str;
        devtype[0] = 0;
        *ppart = 0;
        for (cp = str; *cp; lp = cp) {

                /* For each component of the path name... */
                while (*++cp && *cp != '/')
                        ;
                savec = *cp;
                *cp = 0;

                /* ...look whether there is a device with this name */
                dhandle = OF_finddevice(str);
                *cp = savec;
                if (dhandle == -1) {

                        /*
                         * if not, lp is the delimiter between device and path
                         * if the last component was a block device.
                         */

                        if (!strcmp(devtype, "block")) {

                                /* search for arguments */
                                for (cp = lp;
                                     --cp >= str && *cp != '/' && *cp != ':';)
                                        ;

                                if (cp >= str && *cp == ':') {
                                        /*
                                         * found some arguments,
                                         * make OFW ignore them.
                                         */
                                        *cp = 0;
                                        for (cp = lp; *--cp && *cp != ',';)
                                                ;
                                        if (*++cp >= 'a' &&
                                            *cp < 'a' + MAXPARTITIONS)
                                                *ppart = *cp;
                                }
                        }
                        return lp;
                }
                if (OF_getprop(dhandle, "device_type", devtype,
                    sizeof devtype) < 0)
                        devtype[0] = 0;
        }
        return 0;
}

int
strategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf,
    size_t *rsize)
{
        struct of_dev *dev = devdata;
        u_quad_t pos;
        int n;

        if (rw != F_READ)
                return EPERM;
        if (dev->type != OFDEV_DISK)
                panic("strategy");

        pos = (u_quad_t)((blk + dev->partoff) * dev->bsize);

        for (;;) {
                if (OF_seek(dev->handle, pos) < 0)
                        break;
                n = OF_read(dev->handle, buf, size);
                if (n == -2)
                        continue;
                if (n < 0)
                        break;
                *rsize = n;
                return 0;
        }
        return EIO;
}

static int
devopen_dummy(struct open_file *of, ...)
{

        return -1;
}

static int
devclose(struct open_file *of)
{
        struct of_dev *op = of->f_devdata;

        if (op->type == OFDEV_NET)
                net_close(op);
        OF_close(op->handle);
        op->handle = -1;
        return 0;
}

struct devsw devsw[1] = {
        { "OpenFirmware", strategy, devopen_dummy, devclose, noioctl }
};
int ndevs = sizeof devsw / sizeof devsw[0];

static struct fs_ops file_system_ufs = FS_OPS(ufs);
static struct fs_ops file_system_cd9660 = FS_OPS(cd9660);
static struct fs_ops file_system_dosfs = FS_OPS(dosfs);
static struct fs_ops file_system_nfs = FS_OPS(nfs);

struct fs_ops file_system[3];
int nfsys;

static struct of_dev ofdev = {
        -1,
};

char opened_name[256];
int floppyboot;

int
devopen(struct open_file *of, const char *name, char **file)
{
        char *cp;
        char partition;
        char fname[256];
        struct disklabel label;
        int handle, part;
        size_t read;
        int error = 0;
        /* allow disk blocks up to 65536 bytes */
        char buf[DEV_BSIZE<<7];

        if (ofdev.handle != -1)
                panic("devopen");
        if (of->f_flags != F_READ)
                return EPERM;

        strcpy(fname, name);
        cp = filename(fname, &partition);
        if (cp) {
                DPRINTF("filename=%s\n", cp);
                strcpy(buf, cp);
                *cp = 0;
        }
        if (!cp || !*buf)
                strcpy(buf, DEFAULT_KERNEL);

        if (!*fname)
                strcpy(fname, bootdev);
        DPRINTF("fname=%s\n", fname);
        strcpy(opened_name, fname);
        if (partition) {
                cp = opened_name + strlen(opened_name);
                *cp++ = ':';
                *cp++ = partition;
                *cp = 0;
        }
        if (*buf != '/')
                strcat(opened_name, "/");
        strcat(opened_name, buf);
        *file = opened_name + strlen(fname) + 1;
        if (partition) {
                *file += 2;
        }

        if ((handle = OF_finddevice(fname)) == -1) {
                DPRINTF("OF_finddevice(\"%s\") failed\n", fname);
                return ENOENT;
        }

        if (OF_getprop(handle, "name", buf, sizeof buf) < 0)
                return ENXIO;
        floppyboot = !strcmp(buf, "floppy");
        if (OF_getprop(handle, "device_type", buf, sizeof buf) < 0)
                return ENXIO;
        if (!strcmp(buf, "block")) {
                /*
                 * For block devices, indicate raw partition
                 * (:0 in OpenFirmware)
                 */
                strcat(fname, ":0");
        }

        DPRINTF("calling OF_open(fname=%s)\n", fname);
        if ((handle = OF_open(fname)) == -1)
                return ENXIO;
        memset(&ofdev, 0, sizeof ofdev);
        ofdev.handle = handle;

        if (!strcmp(buf, "block")) {
                ofdev.type = OFDEV_DISK;
                ofdev.bsize = DEV_BSIZE;

                /* First try to read a disklabel from a NetBSD MBR partition */
                error = search_mbr_label(&ofdev, 0, buf, &label, 0);

                if (error == ERDLAB) {
                        /* Try to construct a disklabel from RDB partitions */
                        error = search_rdb_label(&ofdev, buf, &label);

                        if (error == ERDLAB) {
                                /* At last read a raw NetBSD disklabel */
                                error = strategy(&ofdev, F_READ, LABELSECTOR,
                                    DEV_BSIZE, buf, &read);
                                if (error == 0 && read != DEV_BSIZE)
                                        error = EIO;
                                if (error == 0)
                                        if (getdisklabel(buf, &label) != NULL)
                                                error = ERDLAB;
                        }
                }

                if (error == ERDLAB) {
                        if (partition) {
                                /*
                                 * User specified a partition,
                                 * but there is none.
                                 */
                                goto bad;
                        }
                        /* No label, just use complete disk */
                        ofdev.partoff = 0;
                } else if (error != 0)
                        goto bad;
                else {
                        part = partition ? partition - 'a' : 0;
                        ofdev.partoff = label.d_partitions[part].p_offset;
                        if (label.d_partitions[part].p_fstype == FS_RAID) {
#define RF_PROTECTED_SECTORS 64
                                ofdev.partoff += RF_PROTECTED_SECTORS;
                                DPRINTF("devopen: found RAID partition, "
                                    "adjusting offset to %lx\n", ofdev.partoff);
                        }
                }
                of->f_dev = devsw;
                of->f_devdata = &ofdev;
                file_system[0] = file_system_ufs;
                file_system[1] = file_system_cd9660;
                file_system[2] = file_system_dosfs;
                nfsys = 3;
                return 0;
        }

        if (!strcmp(buf, "network")) {
                ofdev.type = OFDEV_NET;
                of->f_dev = devsw;
                of->f_devdata = &ofdev;
                file_system[0] = file_system_nfs;
                nfsys = 1;
                if ((error = net_open(&ofdev)) != 0)
                        goto bad;
                return 0;
        }

        error = EFTYPE;
    bad:
        OF_close(handle);
        ofdev.handle = -1;
        return error;
}