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// Definitions for X86 bios disks.
//
// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#ifndef __DISK_H
#define __DISK_H
#include "types.h" // u8
#include "config.h" // CONFIG_*
#include "farptr.h" // struct segoff_s
#define DISK_RET_SUCCESS 0x00
#define DISK_RET_EPARAM 0x01
#define DISK_RET_EADDRNOTFOUND 0x02
#define DISK_RET_EWRITEPROTECT 0x03
#define DISK_RET_ECHANGED 0x06
#define DISK_RET_EBOUNDARY 0x09
#define DISK_RET_EBADTRACK 0x0c
#define DISK_RET_ECONTROLLER 0x20
#define DISK_RET_ETIMEOUT 0x80
#define DISK_RET_ENOTLOCKED 0xb0
#define DISK_RET_ELOCKED 0xb1
#define DISK_RET_ENOTREMOVABLE 0xb2
#define DISK_RET_ETOOMANYLOCKS 0xb4
#define DISK_RET_EMEDIA 0xC0
#define DISK_RET_ENOTREADY 0xAA
/****************************************************************
* Interface structs
****************************************************************/
// Bios disk structures.
struct int13ext_s {
u8 size;
u8 reserved;
u16 count;
struct segoff_s data;
u64 lba;
} PACKED;
#define GET_INT13EXT(regs,var) \
GET_FARVAR((regs)->ds, ((struct int13ext_s*)((regs)->si+0))->var)
#define SET_INT13EXT(regs,var,val) \
SET_FARVAR((regs)->ds, ((struct int13ext_s*)((regs)->si+0))->var, (val))
// Disk Physical Table definition
struct int13dpt_s {
u16 size;
u16 infos;
u32 cylinders;
u32 heads;
u32 spt;
u64 sector_count;
u16 blksize;
u16 dpte_offset;
u16 dpte_segment;
u16 key;
u8 dpi_length;
u8 reserved1;
u16 reserved2;
u8 host_bus[4];
u8 iface_type[8];
u64 iface_path;
u64 device_path;
u8 reserved3;
u8 checksum;
} PACKED;
#define GET_INT13DPT(regs,var) \
GET_FARVAR((regs)->ds, ((struct int13dpt_s*)((regs)->si+0))->var)
#define SET_INT13DPT(regs,var,val) \
SET_FARVAR((regs)->ds, ((struct int13dpt_s*)((regs)->si+0))->var, (val))
// Floppy "Disk Base Table"
struct floppy_dbt_s {
u8 specify1;
u8 specify2;
u8 shutoff_ticks;
u8 bps_code;
u8 sectors;
u8 interblock_len;
u8 data_len;
u8 gap_len;
u8 fill_byte;
u8 settle_time;
u8 startup_time;
} PACKED;
struct floppy_ext_dbt_s {
struct floppy_dbt_s dbt;
// Extra fields
u8 max_track;
u8 data_rate;
u8 drive_type;
} PACKED;
// Helper function for setting up a return code.
struct bregs;
void __disk_ret(struct bregs *regs, u32 linecode, const char *fname);
#define disk_ret(regs, code) \
__disk_ret((regs), (code) | (__LINE__ << 8), __func__)
void __disk_ret_unimplemented(struct bregs *regs, u32 linecode
, const char *fname);
#define disk_ret_unimplemented(regs, code) \
__disk_ret_unimplemented((regs), (code) | (__LINE__ << 8), __func__)
/****************************************************************
* Master boot record
****************************************************************/
struct packed_chs_s {
u8 heads;
u8 sptcyl;
u8 cyllow;
};
struct partition_s {
u8 status;
struct packed_chs_s first;
u8 type;
struct packed_chs_s last;
u32 lba;
u32 count;
} PACKED;
struct mbr_s {
u8 code[440];
// 0x01b8
u32 diskseg;
// 0x01bc
u16 null;
// 0x01be
struct partition_s partitions[4];
// 0x01fe
u16 signature;
} PACKED;
#define MBR_SIGNATURE 0xaa55
/****************************************************************
* Disk command request
****************************************************************/
struct disk_op_s {
u64 lba;
void *buf_fl;
struct drive_s *drive_g;
u16 count;
u8 command;
};
#define CMD_RESET 0x00
#define CMD_READ 0x02
#define CMD_WRITE 0x03
#define CMD_VERIFY 0x04
#define CMD_FORMAT 0x05
#define CMD_SEEK 0x07
#define CMD_ISREADY 0x10
/****************************************************************
* Global storage
****************************************************************/
struct chs_s {
u16 heads; // # heads
u16 cylinders; // # cylinders
u16 spt; // # sectors / track
};
struct drive_s {
u8 type; // Driver type (DTYPE_*)
u8 floppy_type; // Type of floppy (only for floppy drives).
struct chs_s lchs; // Logical CHS
u64 sectors; // Total sectors count
// Info for EDD calls
u16 blksize; // block size
struct chs_s pchs; // Physical CHS
u8 translation; // type of translation
// Driver specific
u32 cntl_id;
u32 cntl_info;
u8 removable; // Removable device flag
char model[41];
};
#define DISK_SECTOR_SIZE 512
#define CDROM_SECTOR_SIZE 2048
#define DTYPE_NONE 0x00
#define DTYPE_FLOPPY 0x01
#define DTYPE_ATA 0x02
#define DTYPE_ATAPI 0x03
#define DTYPE_RAMDISK 0x04
#define DTYPE_CDEMU 0x05
#define TRANSLATION_NONE 0
#define TRANSLATION_LBA 1
#define TRANSLATION_LARGE 2
#define TRANSLATION_RECHS 3
struct drives_s {
// map between bios floppy/hd/cd id and drive_s struct
u8 floppycount;
u8 cdcount;
struct drive_s *idmap[3][CONFIG_MAX_EXTDRIVE];
};
#define EXTTYPE_FLOPPY 0
#define EXTTYPE_HD 1
#define EXTTYPE_CD 2
#define EXTSTART_HD 0x80
#define EXTSTART_CD 0xE0
/****************************************************************
* Function defs
****************************************************************/
// block.c
extern struct drives_s Drives;
struct drive_s *getDrive(u8 exttype, u8 extdriveoffset);
void setup_translation(struct drive_s *drive_g);
void map_floppy_drive(struct drive_s *drive_g);
void map_hd_drive(struct drive_s *drive_g);
void map_cd_drive(struct drive_s *drive_g);
void describe_drive(struct drive_s *drive_g);
int process_op(struct disk_op_s *op);
int send_disk_op(struct disk_op_s *op);
void drive_setup(void);
// floppy.c
extern struct floppy_ext_dbt_s diskette_param_table2;
void floppy_setup(void);
struct drive_s *addFloppy(int floppyid, int ftype, int driver);
void describe_floppy(struct drive_s *drive_g);
int find_floppy_type(u32 size);
int process_floppy_op(struct disk_op_s *op);
void floppy_tick(void);
// cdrom.c
extern struct drive_s *cdemu_drive;
int process_cdemu_op(struct disk_op_s *op);
void cdemu_setup(void);
void cdemu_134b(struct bregs *regs);
int cdrom_boot(int cdid);
// ramdisk.c
void describe_ramdisk(struct drive_s *drive_g);
void ramdisk_setup(void);
int process_ramdisk_op(struct disk_op_s *op);
#endif // disk.h