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// Variable layouts of bios.
//
// Copyright (C) 2008-2010 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)
#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[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_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 bootsplash_active;
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;
// 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