290 lines
7.1 KiB
C
290 lines
7.1 KiB
C
// Variable layouts of bios.
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//
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// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU LGPLv3 license.
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#ifndef __BIOSVAR_H
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#define __BIOSVAR_H
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#include "types.h" // u8
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#include "farptr.h" // GET_FARVAR
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#include "config.h" // CONFIG_*
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/****************************************************************
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* Interupt vector table
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****************************************************************/
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struct ivec {
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union {
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struct {
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u16 offset;
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u16 seg;
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};
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u32 segoff;
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};
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};
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#define SET_IVT(vector, seg, off) \
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SET_FARVAR(SEG_IVT, ((struct ivec *)0)[vector].segoff, ((seg) << 16) | (off))
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/****************************************************************
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* Bios Data Area (BDA)
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****************************************************************/
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struct bios_data_area_s {
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// 40:00
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u16 port_com[4];
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u16 port_lpt[3];
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u16 ebda_seg;
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// 40:10
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u16 equipment_list_flags;
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u8 pad1;
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u16 mem_size_kb;
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u8 pad2;
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u8 ps2_ctrl_flag;
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u8 kbd_flag0;
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u8 kbd_flag1;
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u8 alt_keypad;
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u16 kbd_buf_head;
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u16 kbd_buf_tail;
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// 40:1e
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u8 kbd_buf[32];
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u8 floppy_recalibration_status;
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u8 floppy_motor_status;
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// 40:40
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u8 floppy_motor_counter;
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u8 floppy_last_status;
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u8 floppy_return_status[7];
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u8 video_mode;
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u16 video_cols;
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u16 video_pagesize;
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u16 video_pagestart;
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// 40:50
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u16 cursor_pos[8];
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// 40:60
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u16 cursor_type;
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u8 video_page;
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u16 crtc_address;
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u8 video_msr;
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u8 video_pal;
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u16 jump_ip;
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u16 jump_cs;
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u8 other_6b;
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u32 timer_counter;
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// 40:70
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u8 timer_rollover;
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u8 break_flag;
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u16 soft_reset_flag;
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u8 disk_last_status;
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u8 hdcount;
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u8 disk_control_byte;
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u8 port_disk;
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u8 lpt_timeout[4];
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u8 com_timeout[4];
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// 40:80
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u16 kbd_buf_start_offset;
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u16 kbd_buf_end_offset;
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u8 video_rows;
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u16 char_height;
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u8 video_ctl;
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u8 video_switches;
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u8 modeset_ctl;
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u8 dcc_index;
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u8 floppy_last_data_rate;
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u8 disk_status_controller;
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u8 disk_error_controller;
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u8 disk_interrupt_flag;
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u8 floppy_harddisk_info;
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// 40:90
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u8 floppy_media_state[4];
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u8 floppy_track0;
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u8 floppy_track1;
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u8 kbd_mode;
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u8 kbd_led;
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u32 ptr_user_wait_complete_flag;
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u32 user_wait_timeout;
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// 40:A0
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u8 rtc_wait_flag;
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} PACKED;
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// BDA floppy_recalibration_status bitdefs
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#define FRS_TIMEOUT (1<<7)
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// BDA rtc_wait_flag bitdefs
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#define RWS_WAIT_PENDING (1<<0)
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#define RWS_WAIT_ELAPSED (1<<7)
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// BDA floppy_media_state bitdefs
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#define FMS_DRIVE_STATE_MASK (0x07)
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#define FMS_MEDIA_DRIVE_ESTABLISHED (1<<4)
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#define FMS_DOUBLE_STEPPING (1<<5)
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#define FMS_DATA_RATE_MASK (0xc0)
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// Accessor functions
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#define GET_BDA(var) \
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GET_FARVAR(SEG_BDA, ((struct bios_data_area_s *)0)->var)
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#define SET_BDA(var, val) \
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SET_FARVAR(SEG_BDA, ((struct bios_data_area_s *)0)->var, (val))
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#define CLEARBITS_BDA(var, val) do { \
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typeof(((struct bios_data_area_s *)0)->var) __val = GET_BDA(var); \
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SET_BDA(var, (__val & ~(val))); \
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} while (0)
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#define SETBITS_BDA(var, val) do { \
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typeof(((struct bios_data_area_s *)0)->var) __val = GET_BDA(var); \
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SET_BDA(var, (__val | (val))); \
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} while (0)
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/****************************************************************
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* Extended Bios Data Area (EBDA)
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****************************************************************/
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// DPTE definition
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struct dpte_s {
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u16 iobase1;
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u16 iobase2;
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u8 prefix;
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u8 unused;
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u8 irq;
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u8 blkcount;
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u8 dma;
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u8 pio;
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u16 options;
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u16 reserved;
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u8 revision;
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u8 checksum;
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};
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// ElTorito Device Emulation data
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struct cdemu_s {
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u8 active;
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u8 media;
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u8 emulated_drive;
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u8 controller_index;
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u16 device_spec;
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u32 ilba;
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u16 buffer_segment;
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u16 load_segment;
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u16 sector_count;
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// Virtual device
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u16 heads;
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u16 cylinders;
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u16 spt;
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};
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struct fdpt_s {
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u16 cylinders;
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u8 heads;
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u8 a0h_signature;
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u8 phys_sectors;
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u16 precompensation;
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u8 reserved;
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u8 drive_control_byte;
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u16 phys_cylinders;
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u8 phys_heads;
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u16 landing_zone;
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u8 sectors;
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u8 checksum;
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} PACKED;
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struct extended_bios_data_area_s {
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u8 size;
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u8 reserved1[0x21];
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u32 far_call_pointer;
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u8 mouse_flag1;
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u8 mouse_flag2;
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u8 mouse_data[0x08];
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// 0x30
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u8 other1[0x0d];
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// 0x3d
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struct fdpt_s fdpt[2];
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// 0x5d
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u8 other2[0xC4];
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// 0x121 - Begin custom storage.
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u8 ps2ctr;
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// El Torito Emulation data
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struct cdemu_s cdemu;
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// Count of transferred sectors and bytes to/from disk
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u16 sector_count;
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// Buffer for disk DPTE table
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struct dpte_s dpte;
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// Locks for removable devices
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u8 cdrom_locks[CONFIG_MAX_ATA_DEVICES];
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u16 boot_sequence;
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// Stack space available for code that needs it.
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u8 extra_stack[512] __aligned(8);
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} PACKED;
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// Accessor functions
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static inline u16 get_ebda_seg() {
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return GET_BDA(ebda_seg);
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}
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static inline struct extended_bios_data_area_s *
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get_ebda_ptr()
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{
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extern void *__force_link_error__get_ebda_ptr_only_in_32bit();
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if (MODE16)
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return __force_link_error__get_ebda_ptr_only_in_32bit();
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return (void*)MAKE_FARPTR(get_ebda_seg(), 0);
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}
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#define GET_EBDA2(eseg, var) \
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GET_FARVAR(eseg, ((struct extended_bios_data_area_s *)0)->var)
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#define SET_EBDA2(eseg, var, val) \
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SET_FARVAR(eseg, ((struct extended_bios_data_area_s *)0)->var, (val))
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#define GET_EBDA(var) \
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GET_EBDA2(get_ebda_seg(), var)
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#define SET_EBDA(var, val) \
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SET_EBDA2(get_ebda_seg(), var, (val))
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#define EBDA_OFFSET_TOP_STACK \
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offsetof(struct extended_bios_data_area_s, extra_stack[ \
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FIELD_SIZEOF(struct extended_bios_data_area_s \
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, extra_stack)])
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/****************************************************************
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* Global variables
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****************************************************************/
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#define GET_GLOBAL(var) \
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GET_VAR(CS, (var))
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#if MODE16
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extern void __force_link_error__set_global_only_in_32bit();
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#define SET_GLOBAL(var, val) do { \
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(void)(val); \
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__force_link_error__set_global_only_in_32bit(); \
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} while (0)
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#else
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#define SET_GLOBAL(var, val) \
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do { (var) = (val); } while (0)
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#endif
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/****************************************************************
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* Bios Config Table
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****************************************************************/
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struct bios_config_table_s {
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u16 size;
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u8 model;
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u8 submodel;
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u8 biosrev;
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u8 feature1, feature2, feature3, feature4, feature5;
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} PACKED;
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extern struct bios_config_table_s BIOS_CONFIG_TABLE;
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#endif // __BIOSVAR_H
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