harddisk_io_drive_head_register_fields Struct Reference

Hard disk I/O based Drive / Head Register. More...

#include <harddisk_pio_mode_header.h>

Public Attributes
uint8_t	chs_head_lba_block_number: 4
	In CHS addressing, bits 0 to 3 of the head. In LBA addressing, bits 24 to 27 of the block number. More...
uint8_t	drive_number: 1
	Selects the drive number (short: DRV). More...
uint8_t	always_set_field_1: 1
	Always set. More...
uint8_t	uses_lba: 1
	Uses CHS addressing if clear or LBA addressing if set (short: LBA). More...
uint8_t	always_set_field_2: 1
	Always set. More...

Detailed Description

Hard disk I/O based Drive / Head Register.

Struct used to read from Drive / Head Register of I/O port. Used to select a drive and/or head. Supports extra address/flag bits.

Member Data Documentation

always_set_field_1

uint8_t harddisk_io_drive_head_register_fields::always_set_field_1

Always set.

always_set_field_2

uint8_t harddisk_io_drive_head_register_fields::always_set_field_2

Always set.

chs_head_lba_block_number

uint8_t harddisk_io_drive_head_register_fields::chs_head_lba_block_number

In CHS addressing, bits 0 to 3 of the head. In LBA addressing, bits 24 to 27 of the block number.

drive_number

uint8_t harddisk_io_drive_head_register_fields::drive_number

Selects the drive number (short: DRV).

uses_lba

uint8_t harddisk_io_drive_head_register_fields::uses_lba

Uses CHS addressing if clear or LBA addressing if set (short: LBA).

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

• os/kernel/src/drivers/harddisk/harddisk_pio_mode_header.h