INT 13 SAN device private data. More...

Data Fields
unsigned int	natural_drive
	BIOS natural drive number (0x00-0xff) More...

unsigned int	cylinders
	Number of cylinders. More...

unsigned int	heads
	Number of heads. More...

unsigned int	sectors_per_track
	Number of sectors per track. More...

unsigned int	boot_catalog
	Address of El Torito boot catalog (if any) More...

int	last_status
	Status of last operation. More...

Detailed Description

INT 13 SAN device private data.

Definition at line 56 of file int13.c.

Field Documentation

◆ natural_drive

unsigned int int13_data::natural_drive

BIOS natural drive number (0x00-0xff)

This is the drive number that would have been assigned by 'naturally' appending the drive to the end of the BIOS drive list.

If the emulated drive replaces a preexisting drive, this is the drive number that the preexisting drive gets remapped to.

Definition at line 67 of file int13.c.

Referenced by int13_hook(), and int13_sync_num_drives().

◆ cylinders

unsigned int int13_data::cylinders

Number of cylinders.

The cylinder number field in an INT 13 call is ten bits wide, giving a maximum of 1024 cylinders. Conventionally, when the 7.8GB limit of a CHS address is exceeded, it is the number of cylinders that is increased beyond the addressable limit.

Definition at line 77 of file int13.c.

◆ heads

unsigned int int13_data::heads

Number of heads.

The head number field in an INT 13 call is eight bits wide, giving a maximum of 256 heads. However, apparently all versions of MS-DOS up to and including Win95 fail with 256 heads, so the maximum encountered in practice is 255.

Definition at line 85 of file int13.c.

◆ sectors_per_track

unsigned int int13_data::sectors_per_track

Number of sectors per track.

The sector number field in an INT 13 call is six bits wide, giving a maximum of 63 sectors, since sector numbering (unlike head and cylinder numbering) starts at 1, not 0.

Definition at line 92 of file int13.c.

◆ boot_catalog

unsigned int int13_data::boot_catalog

Address of El Torito boot catalog (if any)

Definition at line 95 of file int13.c.

◆ last_status

int int13_data::last_status

Status of last operation.

Definition at line 97 of file int13.c.

The documentation for this struct was generated from the following file:

arch/x86/interface/pcbios/int13.c

Data Fields