/*
   * (C) Copyright 2001
   * Raymond Lo, lo@routefree.com
   * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   *

   * SPDX-License-Identifier:	GPL-2.0+

   */
  
  /*
   * Support for harddisk partitions.
   *
   * To be compatible with LinuxPPC and Apple we use the standard Apple
   * SCSI disk partitioning scheme. For more information see:
   * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
   */
  
  #include <common.h>
  #include <command.h>
  #include <ide.h>

  #include "part_dos.h"

  #ifdef HAVE_BLOCK_DEVICE

  
  /* Convert char[4] in little endian format to the host format integer
   */
  static inline int le32_to_int(unsigned char *le32)
  {
      return ((le32[3] << 24) +
  	    (le32[2] << 16) +
  	    (le32[1] << 8) +
  	     le32[0]
  	   );
  }
  
  static inline int is_extended(int part_type)
  {
      return (part_type == 0x5 ||
  	    part_type == 0xf ||
  	    part_type == 0x85);
  }

  static inline int is_bootable(dos_partition_t *p)
  {
  	return p->boot_ind == 0x80;
  }

  static void print_one_part(dos_partition_t *p, int ext_part_sector,

  			   int part_num, unsigned int disksig)

  {
  	int lba_start = ext_part_sector + le32_to_int (p->start4);
  	int lba_size  = le32_to_int (p->size4);

  	printf("%3d\t%-10d\t%-10d\t%08x-%02x\t%02x%s%s
  ",
  		part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,

  		(is_extended(p->sys_ind) ? " Extd" : ""),
  		(is_bootable(p) ? " Boot" : ""));

  }

  static int test_block_type(unsigned char *buffer)
  {

  	int slot;
  	struct dos_partition *p;

  	if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  	    (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  		return (-1);
  	} /* no DOS Signature at all */

  	p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
  	for (slot = 0; slot < 3; slot++) {
  		if (p->boot_ind != 0 && p->boot_ind != 0x80) {
  			if (!slot &&
  			    (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
  				     "FAT", 3) == 0 ||
  			     strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
  				     "FAT32", 5) == 0)) {
  				return DOS_PBR; /* is PBR */
  			} else {
  				return -1;
  			}
  		}

  	}

  	return DOS_MBR;	    /* Is MBR */
  }

  int test_part_dos (block_dev_desc_t *dev_desc)
  {

  	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);

  	if (dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1)
  		return -1;
  
  	if (test_block_type(buffer) != DOS_MBR)
  		return -1;
  
  	return 0;

  }
  
  /*  Print a partition that is relative to its Extended partition table
   */

  static void print_partition_extended(block_dev_desc_t *dev_desc,
  				     int ext_part_sector, int relative,

  				     int part_num, unsigned int disksig)

  {

  	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);

  	dos_partition_t *pt;
  	int i;
  
  	if (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
  		printf ("** Can't read partition table on %d:%d **
  ",
  			dev_desc->dev, ext_part_sector);
  		return;
  	}

  	i=test_block_type(buffer);

  	if (i != DOS_MBR) {

  		printf ("bad MBR sector signature 0x%02x%02x
  ",
  			buffer[DOS_PART_MAGIC_OFFSET],
  			buffer[DOS_PART_MAGIC_OFFSET + 1]);
  		return;
  	}

  	if (!ext_part_sector)
  		disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);

  	/* Print all primary/logical partitions */
  	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
  	for (i = 0; i < 4; i++, pt++) {
  		/*

  		 * fdisk does not show the extended partitions that

  		 * are not in the MBR
  		 */
  
  		if ((pt->sys_ind != 0) &&
  		    (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {

  			print_one_part(pt, ext_part_sector, part_num, disksig);

  		}
  
  		/* Reverse engr the fdisk part# assignment rule! */
  		if ((ext_part_sector == 0) ||
  		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
  			part_num++;
  		}
  	}
  
  	/* Follows the extended partitions */
  	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
  	for (i = 0; i < 4; i++, pt++) {
  		if (is_extended (pt->sys_ind)) {
  			int lba_start = le32_to_int (pt->start4) + relative;

  			print_partition_extended(dev_desc, lba_start,
  				ext_part_sector == 0  ? lba_start : relative,

  				part_num, disksig);

  		}
  	}
  
  	return;
  }
  
  
  /*  Print a partition that is relative to its Extended partition table
   */
  static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
  				 int relative, int part_num,

  				 int which_part, disk_partition_t *info,
  				 unsigned int disksig)

  {

  	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);

  	dos_partition_t *pt;
  	int i;
  
  	if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
  		printf ("** Can't read partition table on %d:%d **
  ",
  			dev_desc->dev, ext_part_sector);
  		return -1;
  	}
  	if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
  		buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
  		printf ("bad MBR sector signature 0x%02x%02x
  ",
  			buffer[DOS_PART_MAGIC_OFFSET],
  			buffer[DOS_PART_MAGIC_OFFSET + 1]);
  		return -1;
  	}

  #ifdef CONFIG_PARTITION_UUIDS
  	if (!ext_part_sector)
  		disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
  #endif

  	/* Print all primary/logical partitions */
  	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
  	for (i = 0; i < 4; i++, pt++) {
  		/*

  		 * fdisk does not show the extended partitions that
  		 * are not in the MBR

  		 */

  		if (((pt->boot_ind & ~0x80) == 0) &&
  		    (pt->sys_ind != 0) &&

  		    (part_num == which_part) &&
  		    (is_extended(pt->sys_ind) == 0)) {

  			info->blksz = 512;
  			info->start = ext_part_sector + le32_to_int (pt->start4);
  			info->size  = le32_to_int (pt->size4);
  			switch(dev_desc->if_type) {
  				case IF_TYPE_IDE:

  				case IF_TYPE_SATA:

  				case IF_TYPE_ATAPI:

  					sprintf ((char *)info->name, "hd%c%d",
  						'a' + dev_desc->dev, part_num);

  					break;
  				case IF_TYPE_SCSI:

  					sprintf ((char *)info->name, "sd%c%d",
  						'a' + dev_desc->dev, part_num);

  					break;
  				case IF_TYPE_USB:

  					sprintf ((char *)info->name, "usbd%c%d",
  						'a' + dev_desc->dev, part_num);

  					break;
  				case IF_TYPE_DOC:

  					sprintf ((char *)info->name, "docd%c%d",
  						'a' + dev_desc->dev, part_num);

  					break;
  				default:

  					sprintf ((char *)info->name, "xx%c%d",
  						'a' + dev_desc->dev, part_num);

  					break;
  			}
  			/* sprintf(info->type, "%d, pt->sys_ind); */

  			sprintf ((char *)info->type, "U-Boot");

  			info->bootable = is_bootable(pt);

  #ifdef CONFIG_PARTITION_UUIDS
  			sprintf(info->uuid, "%08x-%02x", disksig, part_num);
  #endif

  			return 0;
  		}
  
  		/* Reverse engr the fdisk part# assignment rule! */
  		if ((ext_part_sector == 0) ||
  		    (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
  			part_num++;
  		}
  	}
  
  	/* Follows the extended partitions */
  	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
  	for (i = 0; i < 4; i++, pt++) {
  		if (is_extended (pt->sys_ind)) {
  			int lba_start = le32_to_int (pt->start4) + relative;
  
  			return get_partition_info_extended (dev_desc, lba_start,
  				 ext_part_sector == 0 ? lba_start : relative,

  				 part_num, which_part, info, disksig);

  		}
  	}
  	return -1;
  }
  
  void print_part_dos (block_dev_desc_t *dev_desc)
  {

  	printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType
  ");
  	print_partition_extended(dev_desc, 0, 0, 1, 0);

  }
  
  int get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
  {

  	return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);

  }

  #endif