harddisk_control_drive_address_register_fields Struct Reference

Hard disk Control based Drive Address Register. More...

#include <harddisk_pio_mode_header.h>

Public Attributes
uint8_t	select_drive_0: 1
	Drive 0 select. Clears when drive 0 selected (short: DS0). More...
uint8_t	select_drive_1: 1
	Drive 1 select. Clears when drive 1 selected (short: DS1). More...
uint8_t	selected_head: 1
	One's compliment representation of the currently selected head (short: HS0 - HS3). More...
uint8_t	write_gate: 1
	Write gate; goes low while writing to the drive is in progress (short: WTG). More...
uint8_t	reserved_for_floppy_controllers: 1
	Reserved for compatibility with floppy drive controllers which may use this bit. More...

Detailed Description

Hard disk Control based Drive Address Register.

Struct used to read from Drive Address Register of Control port. Provides drive select and head select information.

Member Data Documentation

reserved_for_floppy_controllers

uint8_t harddisk_control_drive_address_register_fields::reserved_for_floppy_controllers

Reserved for compatibility with floppy drive controllers which may use this bit.

select_drive_0

uint8_t harddisk_control_drive_address_register_fields::select_drive_0

Drive 0 select. Clears when drive 0 selected (short: DS0).

select_drive_1

uint8_t harddisk_control_drive_address_register_fields::select_drive_1

Drive 1 select. Clears when drive 1 selected (short: DS1).

selected_head

uint8_t harddisk_control_drive_address_register_fields::selected_head

One's compliment representation of the currently selected head (short: HS0 - HS3).

write_gate

uint8_t harddisk_control_drive_address_register_fields::write_gate

Write gate; goes low while writing to the drive is in progress (short: WTG).

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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