harddisk_pio_mode_header.h

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#ifndef HARDDISK_PIO_MODE_HEADER
#define HARDDISK_PIO_MODE_HEADER

#include <stdint.h>

// This OS currently use LBA 48bit for handling hard disks.

// Ports


#define HARDDISK_ATA_PRIMARY_BUS_IO_PORT 0x1F0


#define HARDDISK_ATA_PRIMARY_BUS_CONTROL_PORT 0x3F6


#define HARDDISK_ATA_SECONDARY_BUS_IO_PORT 0x170


#define HARDDISK_ATA_SECONDARY_BUS_CONTROL_PORT 0x376

// Registers offsets


#define HARDDISK_IO_DATA_REGISTER_OFFSET 0


#define HARDDISK_IO_ERROR_REGISTER_OFFSET 1


#define HARDDISK_FEATURES_REGISTER_OFFSET 1


#define HARDDISK_IO_SECTOR_COUNT_REGISTER_OFFSET 2


#define HARDDISK_IO_SECTOR_NUMBER_REGISTER_OFFSET 3


#define HARDDISK_IO_CYLINDER_LOW_REGISTER_OFFSET 4


#define HARDDISK_IO_CYLINDER_HIGH_REGISTER_OFFSET 5


#define HARDDISK_IO_DRIVE_HEAD_REGISTER_OFFSET 6


#define HARDDISK_IO_STATUS_REGISTER_OFFSET 7


#define HARDDISK_IO_COMMAND_REGISTER_OFFSET 7


#define HARDDISK_CONTROL_ALTERNATE_STATUS_REGISTER_OFFSET 0


#define HARDDISK_CONTROL_DEVICE_CONTROL_REGISTER_OFFSET 0


#define HARDDISK_CONTROL_DEVICE_ADDRESS_REGISTER_OFFSET 1

// Structs


typedef struct harddisk_io_error_register_fields
{
    uint8_t unused;
    uint8_t address_mark_not_found : 1;
    uint8_t track_zero_not_found : 1;
    uint8_t aborted_command : 1;
    uint8_t media_change_request : 1;
    uint8_t id_not_found : 1;
    uint8_t media_changed : 1;
    uint8_t uncorrectable_data_error : 1;
    uint8_t bad_block_detected : 1;
} harddisk_io_error_register_fields;


typedef union harddisk_io_error_register
{
    harddisk_io_error_register_fields fields;
    uint16_t value;
} harddisk_io_error_register;


typedef struct harddisk_io_drive_head_register_fields
{
    uint8_t chs_head_lba_block_number : 4;
    uint8_t drive_number : 1;
    uint8_t always_set_field_1 : 1; 
    uint8_t uses_lba : 1;
    uint8_t always_set_field_2 : 1;  
} harddisk_io_drive_head_register_fields;


typedef union harddisk_io_drive_head_register
{
    harddisk_io_drive_head_register_fields fields;
    uint8_t value;

} harddisk_io_drive_head_register;


typedef struct harddisk_io_control_status_register_fields
{
    uint8_t error_occurred : 1;
    uint8_t index : 1;
    uint8_t corrected_data : 1;
    uint8_t drive_ready : 1;
    uint8_t overlapped_mode_service_request : 1;
    uint8_t drive_fault_error : 1;
    uint8_t ready : 1;
    uint8_t busy : 1;
} harddisk_io_control_status_register_fields;


typedef union harddisk_io_control_status_register
{
    harddisk_io_control_status_register_fields fields;
    uint8_t value;
} harddisk_io_control_status_register;


typedef struct harddisk_control_device_control_register_fields
{
    uint8_t always_clear_field_1 : 1;
    uint8_t stop_sending_interrupts : 1;
    uint8_t software_reset : 1;
    uint8_t reserved_field_4 : 1;
    uint8_t reserved_field_3 : 1;
    uint8_t reserved_field_2 : 1;
    uint8_t reserved_field_1 : 1;
    uint8_t high_order_byte_read : 1;
} harddisk_control_device_control_register_fields;


typedef union harddisk_control_device_control_register
{
    harddisk_control_device_control_register_fields fields;
    uint8_t value;
} harddisk_control_device_control_register;


typedef struct harddisk_control_drive_address_register_fields
{
    uint8_t select_drive_0 : 1;  
    uint8_t select_drive_1 : 1;
    uint8_t selected_head : 1;
    uint8_t write_gate : 1;
    uint8_t reserved_for_floppy_controllers : 1; 
} harddisk_control_drive_address_register_fields;


typedef union harddisk_control_drive_address_register
{
    harddisk_control_drive_address_register_fields fields;
    uint8_t value;
} harddisk_control_drive_address_register;

#endif