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1275 |
phoenix |
/*
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* fs/partitions/atari.c
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*
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* Code extracted from drivers/block/genhd.c
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*
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* Copyright (C) 1991-1998 Linus Torvalds
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* Re-organised Feb 1998 Russell King
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*/
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#include <linux/fs.h>
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#include <linux/genhd.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/blk.h>
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#include <linux/ctype.h>
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#include <asm/byteorder.h>
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#include <asm/system.h>
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#include "check.h"
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#include "atari.h"
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/* ++guenther: this should be settable by the user ("make config")?.
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*/
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#define ICD_PARTS
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/* check if a partition entry looks valid -- Atari format is assumed if at
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least one of the primary entries is ok this way */
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#define VALID_PARTITION(pi,hdsiz) \
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(((pi)->flg & 1) && \
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isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
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be32_to_cpu((pi)->st) <= (hdsiz) && \
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be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
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static inline int OK_id(char *s)
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{
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return memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
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memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
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memcmp (s, "RAW", 3) == 0 ;
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}
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int atari_partition (struct gendisk *hd, struct block_device *bdev,
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unsigned long first_sector, int minor)
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{
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int m_lim = minor + hd->max_p;
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Sector sect;
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struct rootsector *rs;
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struct partition_info *pi;
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u32 extensect;
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u32 hd_size;
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#ifdef ICD_PARTS
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int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
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#endif
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rs = (struct rootsector *) read_dev_sector(bdev, 0, §);
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if (!rs)
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return -1;
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/* Verify this is an Atari rootsector: */
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hd_size = hd->part[minor - 1].nr_sects;
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if (!VALID_PARTITION(&rs->part[0], hd_size) &&
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!VALID_PARTITION(&rs->part[1], hd_size) &&
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!VALID_PARTITION(&rs->part[2], hd_size) &&
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!VALID_PARTITION(&rs->part[3], hd_size)) {
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/*
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* if there's no valid primary partition, assume that no Atari
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* format partition table (there's no reliable magic or the like
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* :-()
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*/
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put_dev_sector(sect);
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return 0;
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}
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pi = &rs->part[0];
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printk (" AHDI");
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for (; pi < &rs->part[4] && minor < m_lim; minor++, pi++) {
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struct rootsector *xrs;
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Sector sect2;
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ulong partsect;
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if ( !(pi->flg & 1) )
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continue;
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/* active partition */
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if (memcmp (pi->id, "XGM", 3) != 0) {
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/* we don't care about other id's */
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add_gd_partition (hd, minor, be32_to_cpu(pi->st),
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be32_to_cpu(pi->siz));
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continue;
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}
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/* extension partition */
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#ifdef ICD_PARTS
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part_fmt = 1;
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#endif
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printk(" XGM<");
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partsect = extensect = be32_to_cpu(pi->st);
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while (1) {
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xrs = (struct rootsector *)read_dev_sector(bdev, partsect, §2);
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if (!xrs) {
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printk (" block %ld read failed\n", partsect);
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put_dev_sector(sect);
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return 0;
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}
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/* ++roman: sanity check: bit 0 of flg field must be set */
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if (!(xrs->part[0].flg & 1)) {
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printk( "\nFirst sub-partition in extended partition is not valid!\n" );
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put_dev_sector(sect2);
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break;
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}
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add_gd_partition(hd, minor,
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partsect + be32_to_cpu(xrs->part[0].st),
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be32_to_cpu(xrs->part[0].siz));
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if (!(xrs->part[1].flg & 1)) {
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/* end of linked partition list */
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put_dev_sector(sect2);
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break;
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}
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if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
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printk("\nID of extended partition is not XGM!\n");
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put_dev_sector(sect2);
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break;
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}
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partsect = be32_to_cpu(xrs->part[1].st) + extensect;
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put_dev_sector(sect2);
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minor++;
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if (minor >= m_lim) {
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printk( "\nMaximum number of partitions reached!\n" );
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break;
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}
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}
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printk(" >");
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}
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#ifdef ICD_PARTS
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if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */
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pi = &rs->icdpart[0];
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/* sanity check: no ICD format if first partition invalid */
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if (OK_id(pi->id)) {
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printk(" ICD<");
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for (; pi < &rs->icdpart[8] && minor < m_lim; minor++, pi++) {
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/* accept only GEM,BGM,RAW,LNX,SWP partitions */
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if (!((pi->flg & 1) && OK_id(pi->id)))
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continue;
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part_fmt = 2;
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add_gd_partition (hd, minor,
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be32_to_cpu(pi->st),
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be32_to_cpu(pi->siz));
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}
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printk(" >");
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}
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}
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#endif
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put_dev_sector(sect);
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printk ("\n");
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return 1;
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}
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