Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  fs/partitions/atari.c

 *

 *  Code extracted from drivers/block/genhd.c

 *

 *  Copyright (C) 1991-1998  Linus Torvalds

 *  Re-organised Feb 1998 Russell King

 */

#include <linux/ctype.h>

#include "check.h"

#include "atari.h"

/* ++guenther: this should be settable by the user ("make config")?.

 */

#define ICD_PARTS

/* check if a partition entry looks valid -- Atari format is assumed if at

   least one of the primary entries is ok this way */

#define VALID_PARTITION(pi,hdsiz)                                            \

    (((pi)->flg & 1) &&                                                      \

     isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \

     be32_to_cpu((pi)->st) <= (hdsiz) &&                                     \

     be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))

static inline int OK_id(char *s)

{

        return  memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||

                memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||

                memcmp (s, "RAW", 3) == 0 ;

}

int atari_partition(struct parsed_partitions *state, struct block_device *bdev)

{

        Sector sect;

        struct rootsector *rs;

        struct partition_info *pi;

        u32 extensect;

        u32 hd_size;

        int slot;

#ifdef ICD_PARTS

        int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */

#endif

        rs = (struct rootsector *) read_dev_sector(bdev, 0, &sect);

        if (!rs)

                return -1;

        /* Verify this is an Atari rootsector: */

        hd_size = bdev->bd_inode->i_size >> 9;

        if (!VALID_PARTITION(&rs->part[0], hd_size) &&

            !VALID_PARTITION(&rs->part[1], hd_size) &&

            !VALID_PARTITION(&rs->part[2], hd_size) &&

            !VALID_PARTITION(&rs->part[3], hd_size)) {

                /*

                 * if there's no valid primary partition, assume that no Atari

                 * format partition table (there's no reliable magic or the like

                 * :-()

                 */

                put_dev_sector(sect);

                return 0;

        }

        pi = &rs->part[0];

        printk (" AHDI");

        for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {

                struct rootsector *xrs;

                Sector sect2;

                ulong partsect;

                if ( !(pi->flg & 1) )

                        continue;

                /* active partition */

                if (memcmp (pi->id, "XGM", 3) != 0) {

                        /* we don't care about other id's */

                        put_partition (state, slot, be32_to_cpu(pi->st),

                                        be32_to_cpu(pi->siz));

                        continue;

                }

                /* extension partition */

#ifdef ICD_PARTS

                part_fmt = 1;

#endif

                printk(" XGM<");

                partsect = extensect = be32_to_cpu(pi->st);

                while (1) {

                        xrs = (struct rootsector *)read_dev_sector(bdev, partsect, &sect2);

                        if (!xrs) {

                                printk (" block %ld read failed\n", partsect);

                                put_dev_sector(sect);

                                return -1;

                        }

                        /* ++roman: sanity check: bit 0 of flg field must be set */

                        if (!(xrs->part[0].flg & 1)) {

                                printk( "\nFirst sub-partition in extended partition is not valid!\n" );

                                put_dev_sector(sect2);

                                break;

                        }

                        put_partition(state, slot,

                                   partsect + be32_to_cpu(xrs->part[0].st),

                                   be32_to_cpu(xrs->part[0].siz));

                        if (!(xrs->part[1].flg & 1)) {

                                /* end of linked partition list */

                                put_dev_sector(sect2);

                                break;

                        }

                        if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {

                                printk("\nID of extended partition is not XGM!\n");

                                put_dev_sector(sect2);

                                break;

                        }

                        partsect = be32_to_cpu(xrs->part[1].st) + extensect;

                        put_dev_sector(sect2);

                        if (++slot == state->limit) {

                                printk( "\nMaximum number of partitions reached!\n" );

                                break;

                        }

                }

                printk(" >");

        }

#ifdef ICD_PARTS

        if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */

                pi = &rs->icdpart[0];

                /* sanity check: no ICD format if first partition invalid */

                if (OK_id(pi->id)) {

                        printk(" ICD<");

                        for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {

                                /* accept only GEM,BGM,RAW,LNX,SWP partitions */

                                if (!((pi->flg & 1) && OK_id(pi->id)))

                                        continue;

                                part_fmt = 2;

                                put_partition (state, slot,

                                                be32_to_cpu(pi->st),

                                                be32_to_cpu(pi->siz));

                        }

                        printk(" >");

                }

        }

#endif

        put_dev_sector(sect);

        printk ("\n");

        return 1;

}