| // Variable layouts of bios. |
| // |
| // Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net> |
| // |
| // This file may be distributed under the terms of the GNU LGPLv3 license. |
| #ifndef __BIOSVAR_H |
| #define __BIOSVAR_H |
| |
| #include "types.h" // u8 |
| #include "farptr.h" // GET_FARVAR |
| #include "config.h" // CONFIG_* |
| #include "disk.h" // struct chs_s |
| |
| |
| /**************************************************************** |
| * Interupt vector table |
| ****************************************************************/ |
| |
| struct rmode_IVT { |
| struct segoff_s ivec[256]; |
| }; |
| |
| #define GET_IVT(vector) \ |
| GET_FARVAR(SEG_IVT, ((struct rmode_IVT *)0)->ivec[vector]) |
| #define SET_IVT(vector, segoff) \ |
| SET_FARVAR(SEG_IVT, ((struct rmode_IVT *)0)->ivec[vector], segoff) |
| |
| |
| /**************************************************************** |
| * 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[10]; |
| u16 vbe_mode; |
| } PACKED; |
| |
| // BDA floppy_recalibration_status bitdefs |
| #define FRS_TIMEOUT (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) |
| |
| // Accessor functions |
| #define GET_BDA(var) \ |
| GET_FARVAR(SEG_BDA, ((struct bios_data_area_s *)0)->var) |
| #define SET_BDA(var, val) \ |
| SET_FARVAR(SEG_BDA, ((struct bios_data_area_s *)0)->var, (val)) |
| #define CLEARBITS_BDA(var, val) do { \ |
| typeof(((struct bios_data_area_s *)0)->var) __val = GET_BDA(var); \ |
| SET_BDA(var, (__val & ~(val))); \ |
| } while (0) |
| #define SETBITS_BDA(var, val) do { \ |
| typeof(((struct bios_data_area_s *)0)->var) __val = GET_BDA(var); \ |
| SET_BDA(var, (__val | (val))); \ |
| } while (0) |
| |
| |
| /**************************************************************** |
| * Extended Bios Data Area (EBDA) |
| ****************************************************************/ |
| |
| // DPTE definition |
| struct dpte_s { |
| u16 iobase1; |
| u16 iobase2; |
| u8 prefix; |
| u8 unused; |
| u8 irq; |
| u8 blkcount; |
| u8 dma; |
| u8 pio; |
| u16 options; |
| u16 reserved; |
| u8 revision; |
| u8 checksum; |
| }; |
| |
| // ElTorito Device Emulation data |
| struct cdemu_s { |
| struct drive_s *emulated_drive; |
| u32 ilba; |
| u16 buffer_segment; |
| u16 load_segment; |
| u16 sector_count; |
| u8 active; |
| u8 media; |
| u8 emulated_extdrive; |
| |
| // Virtual device |
| struct chs_s lchs; |
| }; |
| |
| struct fdpt_s { |
| u16 cylinders; |
| u8 heads; |
| u8 a0h_signature; |
| u8 phys_sectors; |
| u16 precompensation; |
| u8 reserved; |
| u8 drive_control_byte; |
| u16 phys_cylinders; |
| u8 phys_heads; |
| u16 landing_zone; |
| u8 sectors; |
| u8 checksum; |
| } PACKED; |
| |
| 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. |
| u8 ps2ctr; |
| int RTCusers; |
| |
| // El Torito Emulation data |
| struct cdemu_s cdemu; |
| |
| // Buffer for disk DPTE table |
| struct dpte_s dpte; |
| |
| // Locks for removable devices |
| u8 cdrom_locks[CONFIG_MAX_EXTDRIVE]; |
| |
| u16 boot_sequence; |
| |
| // Stack space available for code that needs it. |
| u8 extra_stack[512] __aligned(8); |
| |
| u8 cdemu_buf[2048 * !!CONFIG_CDROM_EMU]; |
| } PACKED; |
| |
| // The initial size and location of EBDA |
| #define EBDA_SIZE_START \ |
| DIV_ROUND_UP(sizeof(struct extended_bios_data_area_s), 1024) |
| #define EBDA_SEGMENT_START \ |
| FLATPTR_TO_SEG(BUILD_LOWRAM_END - EBDA_SIZE_START*1024) |
| |
| // Accessor functions |
| static inline u16 get_ebda_seg() { |
| return GET_BDA(ebda_seg); |
| } |
| static inline struct extended_bios_data_area_s * |
| get_ebda_ptr() |
| { |
| ASSERT32(); |
| return MAKE_FLATPTR(get_ebda_seg(), 0); |
| } |
| #define GET_EBDA2(eseg, var) \ |
| GET_FARVAR(eseg, ((struct extended_bios_data_area_s *)0)->var) |
| #define SET_EBDA2(eseg, var, val) \ |
| SET_FARVAR(eseg, ((struct extended_bios_data_area_s *)0)->var, (val)) |
| #define GET_EBDA(var) \ |
| GET_EBDA2(get_ebda_seg(), var) |
| #define SET_EBDA(var, val) \ |
| SET_EBDA2(get_ebda_seg(), var, (val)) |
| |
| #define EBDA_OFFSET_TOP_STACK \ |
| offsetof(struct extended_bios_data_area_s, extra_stack[ \ |
| FIELD_SIZEOF(struct extended_bios_data_area_s \ |
| , extra_stack)]) |
| |
| |
| /**************************************************************** |
| * Global variables |
| ****************************************************************/ |
| |
| #define GLOBAL_SEGREG CS |
| static inline u16 get_global_seg() { |
| return GET_SEG(GLOBAL_SEGREG); |
| } |
| #define GET_GLOBAL(var) \ |
| GET_VAR(GLOBAL_SEGREG, (var)) |
| #define SET_GLOBAL(var, val) do { \ |
| ASSERT32(); \ |
| (var) = (val); \ |
| } while (0) |
| #if MODE16 |
| #define ADJUST_GLOBAL_PTR(var) (var) |
| #else |
| #define ADJUST_GLOBAL_PTR(var) ((typeof(var))((void*)var - BUILD_BIOS_ADDR)) |
| #endif |
| |
| |
| /**************************************************************** |
| * Bios Config Table |
| ****************************************************************/ |
| |
| struct bios_config_table_s { |
| u16 size; |
| u8 model; |
| u8 submodel; |
| u8 biosrev; |
| u8 feature1, feature2, feature3, feature4, feature5; |
| } PACKED; |
| |
| extern struct bios_config_table_s BIOS_CONFIG_TABLE __aligned(1); |
| |
| #endif // __BIOSVAR_H |
