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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amiga.c (3694B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *  fs/partitions/amiga.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#define pr_fmt(fmt) fmt
     12
     13#include <linux/types.h>
     14#include <linux/affs_hardblocks.h>
     15
     16#include "check.h"
     17
     18static __inline__ u32
     19checksum_block(__be32 *m, int size)
     20{
     21	u32 sum = 0;
     22
     23	while (size--)
     24		sum += be32_to_cpu(*m++);
     25	return sum;
     26}
     27
     28int amiga_partition(struct parsed_partitions *state)
     29{
     30	Sector sect;
     31	unsigned char *data;
     32	struct RigidDiskBlock *rdb;
     33	struct PartitionBlock *pb;
     34	int start_sect, nr_sects, blk, part, res = 0;
     35	int blksize = 1;	/* Multiplier for disk block size */
     36	int slot = 1;
     37
     38	for (blk = 0; ; blk++, put_dev_sector(sect)) {
     39		if (blk == RDB_ALLOCATION_LIMIT)
     40			goto rdb_done;
     41		data = read_part_sector(state, blk, &sect);
     42		if (!data) {
     43			pr_err("Dev %s: unable to read RDB block %d\n",
     44			       state->disk->disk_name, blk);
     45			res = -1;
     46			goto rdb_done;
     47		}
     48		if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
     49			continue;
     50
     51		rdb = (struct RigidDiskBlock *)data;
     52		if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
     53			break;
     54		/* Try again with 0xdc..0xdf zeroed, Windows might have
     55		 * trashed it.
     56		 */
     57		*(__be32 *)(data+0xdc) = 0;
     58		if (checksum_block((__be32 *)data,
     59				be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
     60			pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n",
     61			       blk);
     62			break;
     63		}
     64
     65		pr_err("Dev %s: RDB in block %d has bad checksum\n",
     66		       state->disk->disk_name, blk);
     67	}
     68
     69	/* blksize is blocks per 512 byte standard block */
     70	blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
     71
     72	{
     73		char tmp[7 + 10 + 1 + 1];
     74
     75		/* Be more informative */
     76		snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512);
     77		strlcat(state->pp_buf, tmp, PAGE_SIZE);
     78	}
     79	blk = be32_to_cpu(rdb->rdb_PartitionList);
     80	put_dev_sector(sect);
     81	for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
     82		blk *= blksize;	/* Read in terms partition table understands */
     83		data = read_part_sector(state, blk, &sect);
     84		if (!data) {
     85			pr_err("Dev %s: unable to read partition block %d\n",
     86			       state->disk->disk_name, blk);
     87			res = -1;
     88			goto rdb_done;
     89		}
     90		pb  = (struct PartitionBlock *)data;
     91		blk = be32_to_cpu(pb->pb_Next);
     92		if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
     93			continue;
     94		if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
     95			continue;
     96
     97		/* Tell Kernel about it */
     98
     99		nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
    100			    be32_to_cpu(pb->pb_Environment[9])) *
    101			   be32_to_cpu(pb->pb_Environment[3]) *
    102			   be32_to_cpu(pb->pb_Environment[5]) *
    103			   blksize;
    104		if (!nr_sects)
    105			continue;
    106		start_sect = be32_to_cpu(pb->pb_Environment[9]) *
    107			     be32_to_cpu(pb->pb_Environment[3]) *
    108			     be32_to_cpu(pb->pb_Environment[5]) *
    109			     blksize;
    110		put_partition(state,slot++,start_sect,nr_sects);
    111		{
    112			/* Be even more informative to aid mounting */
    113			char dostype[4];
    114			char tmp[42];
    115
    116			__be32 *dt = (__be32 *)dostype;
    117			*dt = pb->pb_Environment[16];
    118			if (dostype[3] < ' ')
    119				snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
    120					dostype[0], dostype[1],
    121					dostype[2], dostype[3] + '@' );
    122			else
    123				snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
    124					dostype[0], dostype[1],
    125					dostype[2], dostype[3]);
    126			strlcat(state->pp_buf, tmp, PAGE_SIZE);
    127			snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
    128				be32_to_cpu(pb->pb_Environment[6]),
    129				be32_to_cpu(pb->pb_Environment[4]));
    130			strlcat(state->pp_buf, tmp, PAGE_SIZE);
    131		}
    132		res = 1;
    133	}
    134	strlcat(state->pp_buf, "\n", PAGE_SIZE);
    135
    136rdb_done:
    137	return res;
    138}