| // 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[9]; |
| u8 vbe_flag; |
| u16 vbe_mode; |
| u8 other_bc[4]; |
| // 40:C0 |
| u8 other_c0[4*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 |
