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/*
 *  fs/partitions/sun.c
 *
 *  Code extracted from drivers/block/genhd.c
 *
 *  Copyright (C) 1991-1998  Linus Torvalds
 *  Re-organised Feb 1998 Russell King
 */
 
#include <linux/config.h>
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/blk.h>
 
#include <asm/system.h>
 
#include "check.h"
#include "sun.h"
 
#ifdef CONFIG_BLK_DEV_MD
extern void md_autodetect_dev(kdev_t dev);
#endif
 
int sun_partition(struct gendisk *hd, struct block_device *bdev, unsigned long first_sector, int first_part_minor)
{
	int i, csum;
	unsigned short *ush;
	Sector sect;
	kdev_t dev = to_kdev_t(bdev->bd_dev);
	struct sun_disklabel {
		unsigned char info[128];   /* Informative text string */
		unsigned char spare0[14];
		struct sun_info {
			unsigned char spare1;
			unsigned char id;
			unsigned char spare2;
			unsigned char flags;
		} infos[8];
		unsigned char spare[246];  /* Boot information etc. */
		unsigned short rspeed;     /* Disk rotational speed */
		unsigned short pcylcount;  /* Physical cylinder count */
		unsigned short sparecyl;   /* extra sects per cylinder */
		unsigned char spare2[4];   /* More magic... */
		unsigned short ilfact;     /* Interleave factor */
		unsigned short ncyl;       /* Data cylinder count */
		unsigned short nacyl;      /* Alt. cylinder count */
		unsigned short ntrks;      /* Tracks per cylinder */
		unsigned short nsect;      /* Sectors per track */
		unsigned char spare3[4];   /* Even more magic... */
		struct sun_partition {
			__u32 start_cylinder;
			__u32 num_sectors;
		} partitions[8];
		unsigned short magic;      /* Magic number */
		unsigned short csum;       /* Label xor'd checksum */
	} * label;		
	struct sun_partition *p;
	unsigned long spc;
 
	label = (struct sun_disklabel *)read_dev_sector(bdev, 0, &sect);
	if (!label)
		return -1;
 
	p = label->partitions;
	if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
/*		printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
		       bdevname(dev), be16_to_cpu(label->magic)); */
		put_dev_sector(sect);
		return 0;
	}
	/* Look at the checksum */
	ush = ((unsigned short *) (label+1)) - 1;
	for (csum = 0; ush >= ((unsigned short *) label);)
		csum ^= *ush--;
	if (csum) {
		printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
		       bdevname(dev));
		put_dev_sector(sect);
		return 0;
	}
 
	/* All Sun disks have 8 partition entries */
	spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
	for (i = 0; i < 8; i++, p++) {
		unsigned long st_sector;
		int num_sectors;
 
		st_sector = first_sector + be32_to_cpu(p->start_cylinder) * spc;
		num_sectors = be32_to_cpu(p->num_sectors);
		if (num_sectors) {
			add_gd_partition(hd, first_part_minor,
					 st_sector, num_sectors);
#ifdef CONFIG_BLK_DEV_MD
			if (label->infos[i].id == LINUX_RAID_PARTITION)
				md_autodetect_dev(MKDEV(hd->major,
							first_part_minor));
#endif
		}
		first_part_minor++;
	}
	printk("\n");
	put_dev_sector(sect);
	return 1;
}