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// BIOS Data Area (and similar) definitions
#ifndef __BDA_H
#define __BDA_H
#include "disk.h" // struct fdpt_s
#include "types.h" // u8
/****************************************************************
* Interupt vector table
****************************************************************/
struct rmode_IVT {
struct segoff_s ivec[256];
};
/****************************************************************
* Bios Data Area (BDA)
****************************************************************/
struct bios_data_area_s {
// 40:00
u16 port_com[4];
u16 port_lpt[3];
u16 ebda_seg;
// 40:10
u16 equipment_list_flags;
u8 pad1;
u16 mem_size_kb;
u8 pad2;
u8 ps2_ctrl_flag;
u8 kbd_flag0;
u8 kbd_flag1;
u8 alt_keypad;
u16 kbd_buf_head;
u16 kbd_buf_tail;
// 40:1e
u8 kbd_buf[32];
u8 floppy_recalibration_status;
u8 floppy_motor_status;
// 40:40
u8 floppy_motor_counter;
u8 floppy_last_status;
u8 floppy_return_status[7];
u8 video_mode;
u16 video_cols;
u16 video_pagesize;
u16 video_pagestart;
// 40:50
u16 cursor_pos[8];
// 40:60
u16 cursor_type;
u8 video_page;
u16 crtc_address;
u8 video_msr;
u8 video_pal;
struct segoff_s jump;
u8 other_6b;
u32 timer_counter;
// 40:70
u8 timer_rollover;
u8 break_flag;
u16 soft_reset_flag;
u8 disk_last_status;
u8 hdcount;
u8 disk_control_byte;
u8 port_disk;
u8 lpt_timeout[4];
u8 com_timeout[4];
// 40:80
u16 kbd_buf_start_offset;
u16 kbd_buf_end_offset;
u8 video_rows;
u16 char_height;
u8 video_ctl;
u8 video_switches;
u8 modeset_ctl;
u8 dcc_index;
u8 floppy_last_data_rate;
u8 disk_status_controller;
u8 disk_error_controller;
u8 disk_interrupt_flag;
u8 floppy_harddisk_info;
// 40:90
u8 floppy_media_state[4];
u8 floppy_track[2];
u8 kbd_flag2;
u8 kbd_led;
struct segoff_s user_wait_complete_flag;
u32 user_wait_timeout;
// 40:A0
u8 rtc_wait_flag;
u8 other_a1[7];
struct segoff_s video_savetable;
u8 other_ac[4];
// 40:B0
u8 other_b0[5*16];
} PACKED;
// BDA floppy_recalibration_status bitdefs
#define FRS_IRQ (1<<7)
// BDA rtc_wait_flag bitdefs
#define RWS_WAIT_PENDING (1<<0)
#define RWS_WAIT_ELAPSED (1<<7)
// BDA floppy_media_state bitdefs
#define FMS_DRIVE_STATE_MASK (0x07)
#define FMS_MEDIA_DRIVE_ESTABLISHED (1<<4)
#define FMS_DOUBLE_STEPPING (1<<5)
#define FMS_DATA_RATE_MASK (0xc0)
// Limit of BDA timer_counter field
#define TICKS_PER_DAY 1573040
/****************************************************************
* Extended Bios Data Area (EBDA)
****************************************************************/
struct extended_bios_data_area_s {
u8 size;
u8 reserved1[0x21];
struct segoff_s far_call_pointer;
u8 mouse_flag1;
u8 mouse_flag2;
u8 mouse_data[0x08];
// 0x30
u8 other1[0x0d];
// 0x3d
struct fdpt_s fdpt[2];
// 0x5d
u8 other2[0xC4];
// 0x121 - Begin custom storage.
} PACKED;
/****************************************************************
* Bios Config Table
****************************************************************/
struct bios_config_table_s {
u16 size;
u8 model;
u8 submodel;
u8 biosrev;
u8 feature1, feature2, feature3, feature4, feature5;
} PACKED;
#endif // bda.h
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