cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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atari.c (4225B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *  fs/partitions/atari.c
      4 *
      5 *  Code extracted from drivers/block/genhd.c
      6 *
      7 *  Copyright (C) 1991-1998  Linus Torvalds
      8 *  Re-organised Feb 1998 Russell King
      9 */
     10
     11#include <linux/ctype.h>
     12#include "check.h"
     13#include "atari.h"
     14
     15/* ++guenther: this should be settable by the user ("make config")?.
     16 */
     17#define ICD_PARTS
     18
     19/* check if a partition entry looks valid -- Atari format is assumed if at
     20   least one of the primary entries is ok this way */
     21#define	VALID_PARTITION(pi,hdsiz)					     \
     22    (((pi)->flg & 1) &&							     \
     23     isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
     24     be32_to_cpu((pi)->st) <= (hdsiz) &&				     \
     25     be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
     26
     27static inline int OK_id(char *s)
     28{
     29	return  memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
     30		memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
     31		memcmp (s, "RAW", 3) == 0 ;
     32}
     33
     34int atari_partition(struct parsed_partitions *state)
     35{
     36	Sector sect;
     37	struct rootsector *rs;
     38	struct partition_info *pi;
     39	u32 extensect;
     40	u32 hd_size;
     41	int slot;
     42#ifdef ICD_PARTS
     43	int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
     44#endif
     45
     46	/*
     47	 * ATARI partition scheme supports 512 lba only.  If this is not
     48	 * the case, bail early to avoid miscalculating hd_size.
     49	 */
     50	if (queue_logical_block_size(state->disk->queue) != 512)
     51		return 0;
     52
     53	rs = read_part_sector(state, 0, &sect);
     54	if (!rs)
     55		return -1;
     56
     57	/* Verify this is an Atari rootsector: */
     58	hd_size = get_capacity(state->disk);
     59	if (!VALID_PARTITION(&rs->part[0], hd_size) &&
     60	    !VALID_PARTITION(&rs->part[1], hd_size) &&
     61	    !VALID_PARTITION(&rs->part[2], hd_size) &&
     62	    !VALID_PARTITION(&rs->part[3], hd_size)) {
     63		/*
     64		 * if there's no valid primary partition, assume that no Atari
     65		 * format partition table (there's no reliable magic or the like
     66	         * :-()
     67		 */
     68		put_dev_sector(sect);
     69		return 0;
     70	}
     71
     72	pi = &rs->part[0];
     73	strlcat(state->pp_buf, " AHDI", PAGE_SIZE);
     74	for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {
     75		struct rootsector *xrs;
     76		Sector sect2;
     77		ulong partsect;
     78
     79		if ( !(pi->flg & 1) )
     80			continue;
     81		/* active partition */
     82		if (memcmp (pi->id, "XGM", 3) != 0) {
     83			/* we don't care about other id's */
     84			put_partition (state, slot, be32_to_cpu(pi->st),
     85					be32_to_cpu(pi->siz));
     86			continue;
     87		}
     88		/* extension partition */
     89#ifdef ICD_PARTS
     90		part_fmt = 1;
     91#endif
     92		strlcat(state->pp_buf, " XGM<", PAGE_SIZE);
     93		partsect = extensect = be32_to_cpu(pi->st);
     94		while (1) {
     95			xrs = read_part_sector(state, partsect, &sect2);
     96			if (!xrs) {
     97				printk (" block %ld read failed\n", partsect);
     98				put_dev_sector(sect);
     99				return -1;
    100			}
    101
    102			/* ++roman: sanity check: bit 0 of flg field must be set */
    103			if (!(xrs->part[0].flg & 1)) {
    104				printk( "\nFirst sub-partition in extended partition is not valid!\n" );
    105				put_dev_sector(sect2);
    106				break;
    107			}
    108
    109			put_partition(state, slot,
    110				   partsect + be32_to_cpu(xrs->part[0].st),
    111				   be32_to_cpu(xrs->part[0].siz));
    112
    113			if (!(xrs->part[1].flg & 1)) {
    114				/* end of linked partition list */
    115				put_dev_sector(sect2);
    116				break;
    117			}
    118			if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
    119				printk("\nID of extended partition is not XGM!\n");
    120				put_dev_sector(sect2);
    121				break;
    122			}
    123
    124			partsect = be32_to_cpu(xrs->part[1].st) + extensect;
    125			put_dev_sector(sect2);
    126			if (++slot == state->limit) {
    127				printk( "\nMaximum number of partitions reached!\n" );
    128				break;
    129			}
    130		}
    131		strlcat(state->pp_buf, " >", PAGE_SIZE);
    132	}
    133#ifdef ICD_PARTS
    134	if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */
    135		pi = &rs->icdpart[0];
    136		/* sanity check: no ICD format if first partition invalid */
    137		if (OK_id(pi->id)) {
    138			strlcat(state->pp_buf, " ICD<", PAGE_SIZE);
    139			for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {
    140				/* accept only GEM,BGM,RAW,LNX,SWP partitions */
    141				if (!((pi->flg & 1) && OK_id(pi->id)))
    142					continue;
    143				put_partition (state, slot,
    144						be32_to_cpu(pi->st),
    145						be32_to_cpu(pi->siz));
    146			}
    147			strlcat(state->pp_buf, " >", PAGE_SIZE);
    148		}
    149	}
    150#endif
    151	put_dev_sector(sect);
    152
    153	strlcat(state->pp_buf, "\n", PAGE_SIZE);
    154
    155	return 1;
    156}