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Annotation of coherent/d/conf/tboot/fdisk.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *
        !             3:  * fdisk( fp ) --      Fixed Disk Configuration
        !             4:  * dev_t dev;
        !             5:  * struct fdisk_s *fp;
        !             6:  *
        !             7:  *     Input:  fp  = pointer to memory-resident partition info (to update)
        !             8:  *
        !             9:  *     Action: Read first block from the device.
        !            10:  *             If valid signature present on block,
        !            11:  *                     copy partition information to memory
        !            12:  *
        !            13:  *     Return: 1 = partition information successfully updated
        !            14:  *             0 = failure (could not read block, or bad signature)
        !            15:  */
        !            16: 
        !            17: #include <sys/coherent.h>
        !            18: #include <sys/uproc.h>
        !            19: #include <errno.h>
        !            20: #include <sys/inode.h>
        !            21: #include <sys/fdisk.h>
        !            22: #include <sys/buf.h>
        !            23: #include <sys/con.h>
        !            24: 
        !            25: int
        !            26: fdisk( fp )
        !            27: register FDISK_S *fp;
        !            28: {
        !            29:        register HDISK_S *hp;
        !            30:        BUF *bp, *xbread();
        !            31:        int i;
        !            32:        int ret = 0;
        !            33: 
        !            34:        /* xbread() reads relative to the start of the whole disk, rather
        !            35:         * than the start of the boot partition.  It also does not
        !            36:         * impliment sparse blocks.
        !            37:         */
        !            38:        if ((BUF *) NULL != (bp = xbread((daddr_t) 0))) {  /* data read */
        !            39:                hp = (HDISK_S *) bp->b_paddr;
        !            40:                if ( hp->hd_sig == HDSIG ) {    /* valid data */
        !            41:                        for (i=0; i < NPARTN; ++i)
        !            42:                                *fp++ = hp->hd_partn[i];
        !            43:                        ret   = 1;
        !            44:                }
        !            45:                brelease( bp );
        !            46:        }
        !            47: 
        !            48:        return ret;
        !            49: }

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