/*      $NetBSD: md_root.c,v 1.37 2026/05/30 10:10:11 thorpej Exp $     */

/*
 * Copyright (c) 1996 Leo Weppelman.
 * 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.
 *
 * 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: md_root.c,v 1.37 2026/05/30 10:10:11 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/conf.h>
#include <sys/disklabel.h>
#include <sys/disk.h>

#include <dev/cons.h>
#include <dev/md.h>

#include <atari/atari/device.h>

/*
 * Misc. defines:
 */
#define RAMD_CHUNK      (9 * 512)       /* Chunk-size for auto-load     */
#define RAMD_NDEV       3               /* Number of devices configured */

struct   ramd_info {
        u_long  ramd_size;  /* Size of disk in bytes                    */
        u_long  ramd_flag;  /* see defs below                           */
        dev_t   ramd_dev;   /* device to load from                      */
};

/*
 * ramd_flag:
 */
#define RAMD_LOAD       0x01    /* Auto load when first opened  */
#define RAMD_LCOMP      0x02    /* Input is compressed          */

struct ramd_info rd_info[RAMD_NDEV] = {
    {
        1105920,                /*      1Mb in 2160 sectors             */
        RAMD_LOAD,              /* auto-load this device                */
        MAKEDISKDEV(2, 0, 2),   /* XXX: This is crap! (720Kb flop)      */
    },
    {
        1474560,                /* 1.44Mb in 2880 sectors               */
        RAMD_LOAD,              /* auto-load this device                */
        MAKEDISKDEV(2, 0, 2),   /* XXX: This is crap! (720Kb flop)      */
    },
    {
        1474560,                /* 1.44Mb in 2880 sectors               */
        RAMD_LOAD,              /* auto-load this device                */
        MAKEDISKDEV(2, 0, 3),   /* XXX: This is crap! (1.44Mb flop)     */
    }
};

struct read_info {
    struct buf  *bp;            /* buffer for strategy function         */
    long        nbytes;         /* total number of bytes to read        */
    long        offset;         /* offset in input medium               */
    char        *bufp;          /* current output buffer                */
    char        *ebufp;         /* absolute maximum for bufp            */
    int         chunk;          /* chunk size on input medium           */
    int         media_sz;       /* size of input medium                 */
    void        (*strat)(struct buf *); /* strategy function for read   */
};


static int  loaddisk(struct  md_conf *, dev_t ld_dev, struct lwp *);
static int  ramd_norm_read(struct read_info *);

#ifdef support_compression
static int  cpy_uncompressed(void *, int, struct read_info *);
static int  md_compressed(void *, int, struct read_info *);
#endif

/*
 * This is called during autoconfig.
 */
void
md_attach_hook(int unit, struct md_conf *md)
{

        if (atari_realconfig && (unit < RAMD_NDEV) && rd_info[unit].ramd_flag) {
                printf ("md%d: %sauto-load on open. Size %ld bytes.\n", unit,
                    rd_info[unit].ramd_flag & RAMD_LCOMP ? "decompress/" : "",
                    rd_info[unit].ramd_size);
                md->md_type = MD_UNCONFIGURED; /* Paranoia... */
        }
}

void
md_open_hook(int unit, struct md_conf *md)
{
        struct ramd_info *ri;

        if (unit >= RAMD_NDEV)
                return;

        ri = &rd_info[unit];
        if (md->md_type != MD_UNCONFIGURED)
                return; /* Only configure once */
        md->md_addr = kmem_alloc(ri->ramd_size, KM_SLEEP);
        md->md_size = ri->ramd_size;
        if (md->md_addr == NULL)
                return;
        if (ri->ramd_flag & RAMD_LOAD) {
                if (loaddisk(md, ri->ramd_dev, curlwp)) {
                        kmem_free(md->md_addr, ri->ramd_size);
                        md->md_addr = NULL;
                        return;
                }
        }
        md->md_type = MD_KMEM_ALLOCATED;
}

static int
loaddisk(struct md_conf *md, dev_t ld_dev, struct lwp *lwp)
{
        struct buf              *buf;
        int                     error;
        const struct bdevsw     *bdp;
        struct disklabel        dl;
        struct read_info        rs;

        bdp = bdevsw_lookup(ld_dev);
        if (bdp == NULL)
                return ENXIO;

        /*
         * Initialize our buffer header:
         */
        buf = getiobuf(NULL, false);
        buf->b_cflags = BC_BUSY;
        buf->b_dev   = ld_dev;
        buf->b_error = 0;
        buf->b_proc  = lwp->l_proc;

        /*
         * Setup read_info:
         */
        rs.bp       = buf;
        rs.nbytes   = md->md_size;
        rs.offset   = 0;
        rs.bufp     = md->md_addr;
        rs.ebufp    = (char *)md->md_addr + md->md_size;
        rs.chunk    = RAMD_CHUNK;
        rs.media_sz = md->md_size;
        rs.strat    = bdp->d_strategy;

        /*
         * Open device and try to get some statistics.
         */
        if ((error = bdp->d_open(ld_dev, FREAD | FNONBLOCK, 0, lwp)) != 0) {
                putiobuf(buf);
                return error;
        }
        if (bdp->d_ioctl(ld_dev, DIOCGDINFO, (void *)&dl, FREAD, lwp) == 0) {
                /* Read on a cylinder basis */
                rs.chunk    = dl.d_secsize * dl.d_secpercyl;
                rs.media_sz = dl.d_secperunit * dl.d_secsize;
        }

#ifdef support_compression
        if (ri->ramd_flag & RAMD_LCOMP)
                error = decompress(cpy_uncompressed, md_compressed, &rs);
        else
#endif /* support_compression */
                error = ramd_norm_read(&rs);

        bdp->d_close(ld_dev, FREAD | FNONBLOCK, 0, lwp);
        putiobuf(buf);
        return error;
}

static int
ramd_norm_read(struct read_info *rsp)
{
        long            bytes_left;
        int             done, error;
        struct buf      *bp;
        int             dotc = 0;

        bytes_left = rsp->nbytes;
        bp         = rsp->bp;
        error      = 0;

        while (bytes_left > 0) {
                bp->b_cflags = BC_BUSY;
                bp->b_flags  = B_PHYS | B_READ;
                bp->b_oflags &= ~BO_DONE;
                bp->b_blkno  = btodb(rsp->offset);
                bp->b_bcount = uimin(rsp->chunk, bytes_left);
                bp->b_data   = rsp->bufp;
                bp->b_error  = 0;

                /* Initiate read */
                (*rsp->strat)(bp);

                /* Wait for results     */
                biowait(bp);
                error = bp->b_error;

                /* Dot counter */
                printf(".");
                if (!(++dotc % 40))
                        printf("\n");

                done = bp->b_bcount - bp->b_resid;

                bytes_left   -= done;
                rsp->offset  += done;
                rsp->bufp    += done;

                if (error || !done)
                        break;

                if ((rsp->offset == rsp->media_sz) && (bytes_left != 0)) {
                        printf("\nInsert next media and hit any key...");
                        cngetc();
                        printf("\n");
                        rsp->offset = 0;
                }
        }
        printf("\n");
        return error;
}

#ifdef support_compression
/*
 * Functions supporting uncompression:
 */
/*
 * Copy from the uncompression buffer to the ramdisk
 */
static int
cpy_uncompressed(void * buf, int nbyte, struct read_info *rsp)
{

        if ((rsp->bufp + nbyte) >= rsp->ebufp)
                return 0;
        memcpy(rsp->bufp, buf, nbyte);
        rsp->bufp += nbyte;
        return 0;
}

/*
 * Read a maximum of 'nbyte' bytes into 'buf'.
 */
static int
md_compressed(void * buf, int nbyte, struct read_info *rsp)
{
        static int      dotc = 0;
        struct buf      *bp;
        int             nread = 0;
        int             done, error;


        error  = 0;
        bp     = rsp->bp;
        nbyte &= ~(DEV_BSIZE - 1);

        while (nbyte > 0) {
                bp->b_cflags = BC_BUSY;
                bp->b_flags  = B_PHYS | B_READ;
                bp->b_oflags &= ~BO_DONE;
                bp->b_blkno  = btodb(rsp->offset);
                bp->b_bcount = uimin(rsp->chunk, nbyte);
                bp->b_data   = buf;
                bp->b_error  = 0;

                /* Initiate read */
                (*rsp->strat)(bp);

                /* Wait for results     */
                biowait(bp);
                error = bp->b_error;

                /* Dot counter */
                printf(".");
                if (!(++dotc % 40))
                        printf("\n");

                done = bp->b_bcount - bp->b_resid;

                nbyte        -= done;
                nread        += done;
                rsp->offset  += done;

                if (error || !done)
                        break;

                if ((rsp->offset == rsp->media_sz) && (nbyte != 0)) {
                        printf("\nInsert next media and hit any key...");
                        if (cngetc() != '\n')
                                printf("\n");
                        rsp->offset = 0;
                }
        }
        return nread;
}
#endif /* support_compression */