diff options
Diffstat (limited to 'qemu/roms/seabios/src/std/bda.h')
| -rw-r--r-- | qemu/roms/seabios/src/std/bda.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/qemu/roms/seabios/src/std/bda.h b/qemu/roms/seabios/src/std/bda.h new file mode 100644 index 000000000..c321266e2 --- /dev/null +++ b/qemu/roms/seabios/src/std/bda.h @@ -0,0 +1,154 @@ +// 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 |