cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

mac.c (3647B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *  fs/partitions/mac.c
      4 *
      5 *  Code extracted from drivers/block/genhd.c
      6 *  Copyright (C) 1991-1998  Linus Torvalds
      7 *  Re-organised Feb 1998 Russell King
      8 */
      9
     10#include <linux/ctype.h>
     11#include "check.h"
     12#include "mac.h"
     13
     14#ifdef CONFIG_PPC_PMAC
     15#include <asm/machdep.h>
     16extern void note_bootable_part(dev_t dev, int part, int goodness);
     17#endif
     18
     19/*
     20 * Code to understand MacOS partition tables.
     21 */
     22
     23static inline void mac_fix_string(char *stg, int len)
     24{
     25	int i;
     26
     27	for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
     28		stg[i] = 0;
     29}
     30
     31int mac_partition(struct parsed_partitions *state)
     32{
     33	Sector sect;
     34	unsigned char *data;
     35	int slot, blocks_in_map;
     36	unsigned secsize, datasize, partoffset;
     37#ifdef CONFIG_PPC_PMAC
     38	int found_root = 0;
     39	int found_root_goodness = 0;
     40#endif
     41	struct mac_partition *part;
     42	struct mac_driver_desc *md;
     43
     44	/* Get 0th block and look at the first partition map entry. */
     45	md = read_part_sector(state, 0, &sect);
     46	if (!md)
     47		return -1;
     48	if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
     49		put_dev_sector(sect);
     50		return 0;
     51	}
     52	secsize = be16_to_cpu(md->block_size);
     53	put_dev_sector(sect);
     54	datasize = round_down(secsize, 512);
     55	data = read_part_sector(state, datasize / 512, &sect);
     56	if (!data)
     57		return -1;
     58	partoffset = secsize % 512;
     59	if (partoffset + sizeof(*part) > datasize)
     60		return -1;
     61	part = (struct mac_partition *) (data + partoffset);
     62	if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
     63		put_dev_sector(sect);
     64		return 0;		/* not a MacOS disk */
     65	}
     66	blocks_in_map = be32_to_cpu(part->map_count);
     67	if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) {
     68		put_dev_sector(sect);
     69		return 0;
     70	}
     71
     72	if (blocks_in_map >= state->limit)
     73		blocks_in_map = state->limit - 1;
     74
     75	strlcat(state->pp_buf, " [mac]", PAGE_SIZE);
     76	for (slot = 1; slot <= blocks_in_map; ++slot) {
     77		int pos = slot * secsize;
     78		put_dev_sector(sect);
     79		data = read_part_sector(state, pos/512, &sect);
     80		if (!data)
     81			return -1;
     82		part = (struct mac_partition *) (data + pos%512);
     83		if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
     84			break;
     85		put_partition(state, slot,
     86			be32_to_cpu(part->start_block) * (secsize/512),
     87			be32_to_cpu(part->block_count) * (secsize/512));
     88
     89		if (!strncasecmp(part->type, "Linux_RAID", 10))
     90			state->parts[slot].flags = ADDPART_FLAG_RAID;
     91#ifdef CONFIG_PPC_PMAC
     92		/*
     93		 * If this is the first bootable partition, tell the
     94		 * setup code, in case it wants to make this the root.
     95		 */
     96		if (machine_is(powermac)) {
     97			int goodness = 0;
     98
     99			mac_fix_string(part->processor, 16);
    100			mac_fix_string(part->name, 32);
    101			mac_fix_string(part->type, 32);					
    102		    
    103			if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
    104			    && strcasecmp(part->processor, "powerpc") == 0)
    105				goodness++;
    106
    107			if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
    108			    || (strncasecmp(part->type, "Linux", 5) == 0
    109			        && strcasecmp(part->type, "Linux_swap") != 0)) {
    110				int i, l;
    111
    112				goodness++;
    113				l = strlen(part->name);
    114				if (strcmp(part->name, "/") == 0)
    115					goodness++;
    116				for (i = 0; i <= l - 4; ++i) {
    117					if (strncasecmp(part->name + i, "root",
    118						     4) == 0) {
    119						goodness += 2;
    120						break;
    121					}
    122				}
    123				if (strncasecmp(part->name, "swap", 4) == 0)
    124					goodness--;
    125			}
    126
    127			if (goodness > found_root_goodness) {
    128				found_root = slot;
    129				found_root_goodness = goodness;
    130			}
    131		}
    132#endif /* CONFIG_PPC_PMAC */
    133	}
    134#ifdef CONFIG_PPC_PMAC
    135	if (found_root_goodness)
    136		note_bootable_part(state->disk->part0->bd_dev, found_root,
    137				   found_root_goodness);
    138#endif
    139
    140	put_dev_sector(sect);
    141	strlcat(state->pp_buf, "\n", PAGE_SIZE);
    142	return 1;
    143}