// Variable layouts of bios. // // Copyright (C) 2008-2010 Kevin O'Connor // // 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) #define FUNC16(func) ({ \ ASSERT32FLAT(); \ extern void func (void); \ SEGOFF(SEG_BIOS, (u32)func - BUILD_BIOS_ADDR); \ }) /**************************************************************** * 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; } 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_gf; 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 usbkeyinfo { union { struct { u8 modifiers; u8 repeatcount; u8 keys[6]; }; u64 data; }; }; 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; struct usbkeyinfo usbkey_last; 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; /* TSC emulation timekeepers */ u64 tsc_8254; int last_tsc_8254; // Stack space available for code that needs it. u8 extra_stack[512] __aligned(8); } 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(void) { return GET_BDA(ebda_seg); } static inline struct extended_bios_data_area_s * get_ebda_ptr(void) { ASSERT32FLAT(); 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 ****************************************************************/ #if MODE16 == 0 && MODESEGMENT == 1 // In 32bit segmented mode %cs may not be readable and the code may be // relocated. The entry code sets up %gs with a readable segment and // the code offset can be determined by get_global_offset(). #define GLOBAL_SEGREG GS static inline u32 __attribute_const get_global_offset(void) { u32 ret; asm(" calll 1f\n" "1:popl %0\n" " subl $1b, %0" : "=r"(ret)); return ret; } #else #define GLOBAL_SEGREG CS static inline u32 __attribute_const get_global_offset(void) { return 0; } #endif static inline u16 get_global_seg(void) { return GET_SEG(GLOBAL_SEGREG); } #define GET_GLOBAL(var) \ GET_VAR(GLOBAL_SEGREG, *(typeof(&(var)))((void*)&(var) \ + get_global_offset())) #define SET_GLOBAL(var, val) do { \ ASSERT32FLAT(); \ (var) = (val); \ } while (0) #if MODESEGMENT #define GLOBALFLAT2GLOBAL(var) ((typeof(var))((void*)(var) - BUILD_BIOS_ADDR)) #else #define GLOBALFLAT2GLOBAL(var) (var) #endif // Access a "flat" pointer known to point to the f-segment. #define GET_GLOBALFLAT(var) GET_GLOBAL(*GLOBALFLAT2GLOBAL(&(var))) /**************************************************************** * 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