| // Variable layouts of bios. |
| // |
| // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net> |
| // |
| // This file may be distributed under the terms of the GNU GPLv3 license. |
| #ifndef __BIOSVAR_H |
| #define __BIOSVAR_H |
| |
| #include "types.h" // u8 |
| #include "farptr.h" // SET_SEG |
| #include "config.h" // CONFIG_* |
| |
| |
| /**************************************************************** |
| * Bios Data Area (BDA) |
| ****************************************************************/ |
| |
| struct ivec { |
| u16 offset; |
| u16 seg; |
| }; |
| |
| struct bios_data_area_s { |
| // 00:00 |
| struct ivec ivecs[256]; |
| // 30:00 |
| // u8 stack[256]; |
| // 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 other1[0x7]; |
| // 40:50 |
| u8 other2[0x10]; |
| // 40:60 |
| u8 other3[0x7]; |
| u32 jump_cs_ip; |
| u8 dummy; |
| u32 timer_counter; |
| // 40:70 |
| u8 timer_rollover; |
| u8 break_flag; |
| u16 soft_reset_flag; |
| u8 disk_last_status; |
| u8 disk_count; |
| 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 other5[7]; |
| 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_track0; |
| u8 floppy_track1; |
| u8 kbd_mode; |
| u8 kbd_led; |
| u32 ptr_user_wait_complete_flag; |
| u32 user_wait_timeout; |
| // 40:A0 |
| u8 rtc_wait_flag; |
| } 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(0x0000, ((struct bios_data_area_s *)0)->var) |
| #define SET_BDA(var, val) \ |
| SET_FARVAR(0x0000, ((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) |
| |
| |
| /**************************************************************** |
| * Hard drive info |
| ****************************************************************/ |
| |
| struct chs_s { |
| u16 heads; // # heads |
| u16 cylinders; // # cylinders |
| u16 spt; // # sectors / track |
| }; |
| |
| // 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; |
| }; |
| |
| struct ata_channel_s { |
| u8 iface; // ISA or PCI |
| u16 iobase1; // IO Base 1 |
| u16 iobase2; // IO Base 2 |
| u8 irq; // IRQ |
| }; |
| |
| struct ata_device_s { |
| u8 type; // Detected type of ata (ata/atapi/none/unknown) |
| u8 device; // Detected type of attached devices (hd/cd/none) |
| u8 removable; // Removable device flag |
| u8 lock; // Locks for removable devices |
| u8 mode; // transfer mode : PIO 16/32 bits - IRQ - ISADMA - PCIDMA |
| u16 blksize; // block size |
| |
| u8 translation; // type of translation |
| struct chs_s lchs; // Logical CHS |
| struct chs_s pchs; // Physical CHS |
| |
| u32 sectors; // Total sectors count |
| }; |
| |
| struct ata_s { |
| // ATA channels info |
| struct ata_channel_s channels[CONFIG_MAX_ATA_INTERFACES]; |
| |
| // ATA devices info |
| struct ata_device_s devices[CONFIG_MAX_ATA_DEVICES]; |
| // |
| // map between bios hd/cd id and ata channels |
| u8 hdcount, cdcount; |
| u8 idmap[2][CONFIG_MAX_ATA_DEVICES]; |
| |
| // Buffer for DPTE table |
| struct dpte_s dpte; |
| |
| // Count of transferred sectors and bytes |
| u16 trsfsectors; |
| }; |
| |
| // ElTorito Device Emulation data |
| struct cdemu_s { |
| u8 active; |
| u8 media; |
| u8 emulated_drive; |
| u8 controller_index; |
| u16 device_spec; |
| u32 ilba; |
| u16 buffer_segment; |
| u16 load_segment; |
| u16 sector_count; |
| |
| // Virtual device |
| struct chs_s vdevice; |
| }; |
| |
| |
| /**************************************************************** |
| * Initial Program Load (IPL) |
| ****************************************************************/ |
| |
| struct ipl_entry_s { |
| u16 type; |
| u16 flags; |
| u32 vector; |
| u32 description; |
| }; |
| |
| struct ipl_s { |
| struct ipl_entry_s table[8]; |
| u16 count; |
| u16 sequence; |
| }; |
| |
| #define IPL_TYPE_FLOPPY 0x01 |
| #define IPL_TYPE_HARDDISK 0x02 |
| #define IPL_TYPE_CDROM 0x03 |
| #define IPL_TYPE_BEV 0x80 |
| |
| |
| /**************************************************************** |
| * Extended Bios Data Area (EBDA) |
| ****************************************************************/ |
| |
| 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]; |
| u32 far_call_pointer; |
| u8 mouse_flag1; |
| u8 mouse_flag2; |
| u8 mouse_data[0x08]; |
| // 0x30 |
| u8 other1[0x0d]; |
| |
| // 0x3d |
| struct fdpt_s fdpt0; |
| struct fdpt_s fdpt1; |
| |
| // 0x5d |
| u8 other2[0xC4]; |
| |
| // ATA Driver data |
| struct ata_s ata; |
| |
| // El Torito Emulation data |
| struct cdemu_s cdemu; |
| |
| // Initial program load |
| struct ipl_s ipl; |
| } PACKED; |
| |
| // Accessor functions |
| #define GET_EBDA(var) \ |
| GET_FARVAR(EBDA_SEG, ((struct extended_bios_data_area_s *)0)->var) |
| #define SET_EBDA(var, val) \ |
| SET_FARVAR(EBDA_SEG, ((struct extended_bios_data_area_s *)0)->var, (val)) |
| |
| |
| /**************************************************************** |
| * Registers saved/restored in romlayout.S |
| ****************************************************************/ |
| |
| #define UREG(ER, R, RH, RL) union { u32 ER; struct { u16 R; u16 R ## _hi; }; struct { u8 RL; u8 RH; u8 R ## _hilo; u8 R ## _hihi; }; } |
| |
| // Layout of registers passed in to irq handlers. Note that this |
| // layout corresponds to code in romlayout.S - don't change it here |
| // without also updating the assembler code. |
| struct bregs { |
| u16 ds; |
| u16 es; |
| UREG(edi, di, di_hi, di_lo); |
| UREG(esi, si, si_hi, si_lo); |
| UREG(ebx, bx, bh, bl); |
| UREG(edx, dx, dh, dl); |
| UREG(ecx, cx, ch, cl); |
| UREG(eax, ax, ah, al); |
| u16 ip; |
| u16 cs; |
| u16 flags; |
| } PACKED; |
| |
| // bregs flags bitdefs |
| #define F_ZF (1<<6) |
| #define F_CF (1<<0) |
| |
| static inline void |
| set_cf(struct bregs *regs, int cond) |
| { |
| if (cond) |
| regs->flags |= F_CF; |
| else |
| regs->flags &= ~F_CF; |
| } |
| |
| |
| /**************************************************************** |
| * 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; |
| |
| |
| /**************************************************************** |
| * Memory layout info |
| ****************************************************************/ |
| |
| #define SEG_BIOS 0xf000 |
| |
| #define EBDA_SEG 0x9FC0 |
| #define EBDA_SIZE 1 // In KiB |
| #define BASE_MEM_IN_K (640 - EBDA_SIZE) |
| |
| #endif // __BIOSVAR_H |