327 lines
10 KiB
C
327 lines
10 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2009 Pierre-Alexandre Meyer
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*
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* Some parts borrowed from chain.c32:
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*
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* Copyright 2003-2009 H. Peter Anvin - All Rights Reserved
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* Copyright 2009 Intel Corporation; author: H. Peter Anvin
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*
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* Some parts borrowed from Linux:
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*
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* Copyright (C) 2002, 2003, 2004 Dell Inc.
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* by Matt Domsch <Matt_Domsch@dell.com>
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*
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* This file is part of Syslinux, and is made available under
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* the terms of the GNU General Public License version 2.
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*
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* ----------------------------------------------------------------------- */
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#ifndef _GEOM_H_
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#define _GEOM_H_
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#include <stdint.h>
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/**
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* INT 13 Extensions
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*
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* Note: if the size is less than 30 on call, the final DWORD will not be
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* returned by a v2.x implementation; similarly for the Device Path info
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**/
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struct edd_device_parameters {
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uint16_t len; /* size of returned data */
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/**
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* Bitfields for IBM/MS INT 13 Extensions information flags:
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* Bit(s) Description (Table 00274)
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* 0 DMA boundary errors handled transparently
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* 1 cylinder/head/sectors-per-track information is valid
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* 2 removable drive
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* 3 write with verify supported
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* 4 drive has change-line support (required if drive >= 80h is removable)
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* 5 drive can be locked (required if drive >= 80h is removable)
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* 6 CHS information set to maximum supported values, not current media
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* 15-7 reserved (0)
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**/
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uint16_t info; /* information flags */
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uint32_t cylinders; /* number of physical cylinders on drive */
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uint32_t heads; /* number of physical heads on drive */
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uint32_t sectors_per_track; /* number of physical sectors per track */
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uint64_t sectors; /* total number of sectors on drive */
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uint16_t bytes_per_sector; /* bytes per sector */
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/* --- v2.0+ --- */
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uint32_t dpte_pointer; /* EDD configuration parameters, FFFFh:FFFFh if not available */
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/* --- v3.0 --- */
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uint16_t device_path_information; /* signature BEDDh to indicate presence of Device Path info */
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uint8_t device_path_length; /* length of Device Path information, including signature and this byte (24h for v3.0) */
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uint8_t device_path_reserved; /* reserved (0) */
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uint16_t device_path_reserved_2; /* reserved (0) */
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uint8_t host_bus_type[4]; /* ASCIZ name of host bus ("ISA" or "PCI") */
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uint8_t interface_type[8]; /* ASCIZ name of interface type
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* "ATA"
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* "ATAPI"
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* "SCSI"
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* "USB"
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* "1394" IEEE 1394 (FireWire)
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* "FIBRE" Fibre Channel
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*/
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/**
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* Format of EDD v3.0 Interface Path:
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* Offset Size Description (Table 00275)
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* ---ISA---
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* 00h WORD 16-bit base address
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* 02h 6 BYTEs reserved (0)
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* ---PCI---
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* 00h BYTE PCI bus number
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* 01h BYTE PCI device number
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* 02h BYTE PCI function number
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* 03h 5 BYTEs reserved (0)
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**/
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union {
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struct {
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uint16_t base_address;
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uint16_t reserved1;
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uint32_t reserved2;
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} __attribute__ ((packed)) isa;
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struct {
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uint8_t bus;
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uint8_t slot;
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uint8_t function;
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uint8_t channel;
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uint32_t reserved;
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} __attribute__ ((packed)) pci;
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/* pcix is same as pci */
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struct {
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uint64_t reserved;
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} __attribute__ ((packed)) ibnd;
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struct {
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uint64_t reserved;
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} __attribute__ ((packed)) xprs;
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struct {
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uint64_t reserved;
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} __attribute__ ((packed)) htpt;
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struct {
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uint64_t reserved;
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} __attribute__ ((packed)) unknown;
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} interface_path;
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/**
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* Format of EDD v3.0 Device Path:
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* Offset Size Description (Table 00276)
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* ---ATA---
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* 00h BYTE flag: 00h = master, 01h = slave
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* 01h 7 BYTEs reserved (0)
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* ---ATAPI---
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* 00h BYTE flag: 00h = master, 01h = slave
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* 01h BYTE logical unit number
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* 02h 6 BYTEs reserved (0)
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* ---SCSI---
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* 00h BYTE logical unit number
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* 01h 7 BYTEs reserved (0)
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* ---USB---
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* 00h BYTE to be determined
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* 01h 7 BYTEs reserved (0)
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* ---IEEE1394---
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* 00h QWORD 64-bit FireWire General Unique Identifier (GUID)
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* ---FibreChannel---
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* 00h QWORD Word Wide Number (WWN)
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**/
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union {
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struct {
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uint8_t device;
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uint8_t reserved1;
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uint16_t reserved2;
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uint32_t reserved3;
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uint64_t reserved4;
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} __attribute__ ((packed)) ata;
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struct {
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uint8_t device;
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uint8_t lun;
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uint8_t reserved1;
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uint8_t reserved2;
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uint32_t reserved3;
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uint64_t reserved4;
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} __attribute__ ((packed)) atapi;
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struct {
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uint16_t id;
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uint64_t lun;
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uint16_t reserved1;
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uint32_t reserved2;
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} __attribute__ ((packed)) scsi;
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struct {
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uint64_t serial_number;
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uint64_t reserved;
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} __attribute__ ((packed)) usb;
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struct {
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uint64_t eui;
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uint64_t reserved;
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} __attribute__ ((packed)) i1394;
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struct {
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uint64_t wwid;
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uint64_t lun;
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} __attribute__ ((packed)) fibre;
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struct {
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uint64_t identity_tag;
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uint64_t reserved;
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} __attribute__ ((packed)) i2o;
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struct {
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uint32_t array_number;
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uint32_t reserved1;
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uint64_t reserved2;
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} __attribute__ ((packed)) raid;
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struct {
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uint8_t device;
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uint8_t reserved1;
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uint16_t reserved2;
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uint32_t reserved3;
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uint64_t reserved4;
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} __attribute__ ((packed)) sata;
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struct {
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uint64_t reserved1;
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uint64_t reserved2;
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} __attribute__ ((packed)) unknown;
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} device_path;
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uint8_t reserved; /* reserved (0) */
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uint8_t checksum; /* checksum of bytes 1Eh-40h (two's complement of sum, which makes
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* the 8-bit sum of bytes 1Eh-41h equal 00h) */
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} __attribute__ ((packed));
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/*
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* Disk parameters
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*/
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struct driveinfo {
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int disk; /* Disk port (0x80 - 0xff) */
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/* Legacy C/H/S */
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int cbios; /* CHS geometry is valid */
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int legacy_max_head;
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int legacy_max_cylinder;
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int legacy_sectors_per_track;
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int legacy_max_drive;
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int legacy_type; /* Drive type (AT/PS2 floppies only) */
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/* EDD support */
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int ebios; /* EBIOS supported on this disk */
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int edd_version; /* EBIOS major version */
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int edd_functionality_subset;
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struct edd_device_parameters edd_params; /* EDD parameters */
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};
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/**
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* Format of Phoenix Enhanced Disk Drive Spec translated drive parameter table:
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* Offset Size Description (Table 00277)
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* 00h WORD number of cylinders
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* 02h BYTE number of heads
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* 03h BYTE A0h (signature indicating translated table)
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* 04h BYTE number of physical sectors per track
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* 05h WORD starting write precompensation cylinder number
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* 07h BYTE reserved
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* 08h BYTE control byte (see #03198 at INT 41"DISK 0")
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* 09h WORD number of physical cylinders
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* 0Bh BYTE number of physical heads
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* 0Ch WORD cylinder number of landing zone
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* 0Eh BYTE number of logical sectors per track
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* 0Fh BYTE checksum
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* Program: the Phoenix Enhanced Disk Drive Specification is an addition to the
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* IBM/MS INT 13 extensions
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*
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* Format of Phoenix Enhanced Disk Drive Spec Fixed Disk Parameter Table:
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* Offset Size Description (Table 00278)
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* 00h WORD physical I/O port base address
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* 02h WORD disk-drive control port address
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* 04h BYTE drive flags (see #00279)
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* 05h BYTE proprietary information
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* bits 7-4 reserved (0)
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* bits 3-0: Phoenix proprietary (used by BIOS)
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* 06h BYTE IRQ for drive (bits 3-0; bits 7-4 reserved and must be 0)
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* 07h BYTE sector count for multi-sector transfers
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* 08h BYTE DMA control
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* bits 7-4: DMA type (0-2) as per ATA-2 specification
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* bits 3-0: DMA channel
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* 09h BYTE programmed I/O control
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* bits 7-4: reserved (0)
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* bits 3-0: PIO type (1-4) as per ATA-2 specification
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* 0Ah WORD drive options (see #00280)
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* 0Ch 2 BYTEs reserved (0)
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* 0Eh BYTE extension revision level (high nybble=major, low nybble=minor)
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* (currently 10h for v1.0 and 11h for v1.1-3.0)
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* 0Fh BYTE 2's complement checksum of bytes 00h-0Eh
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* 8-bit sum of all bytes 00h-0Fh should equal 00h
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* SeeAlso: #00277
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*
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* Bitfields for Phoenix Enhanced Disk Drive Spec drive flags:
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* Bit(s) Description (Table 00279)
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* 7 reserved (1)
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* 6 LBA enabled
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* 5 reserved (1)
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* 4 drive is slave
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* 3-0 reserved (0)
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* SeeAlso: #00278,#00280
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*
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* Bitfields for Phoenix Enhanced Disk Drive Spec drive options:
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* Bit(s) Description (Table 00280)
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* 0 fast PIO enabled
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* 1 fast DMA access enabled
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* 2 block PIO (multi-sector transfers) enabled
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* 3 CHS translation enabled
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* 4 LBA translation enabled
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* 5 removable media
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* 6 ATAPI device (CD-ROM)
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* 7 32-bit transfer mode
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* ---v1.1+ ---
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* 8 ATAPI device uses DRQ to signal readiness for packet command
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* (must be 0 if bit 6 is 0)
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* 10-9 translation type (must be 00 if bit 3 is 0)
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* 00 Phoenix bit-shifting translation
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* 01 LBA-assisted translation
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* 10 reserved
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* 11 proprietary translation
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* ---v3.0---
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* 11 Ultra DMA access enabled
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* 15-12 reserved
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**/
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/*
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* Values for diskette drive type:
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* 01h 360K
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* 02h 1.2M
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* 03h 720K
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* 04h 1.44M
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* 05h ???
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* reportedly an obscure drive type shipped on some IBM machines,
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* 2.88M on some machines (at least AMI 486 BIOS)
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* 06h 2.88M
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* 10h ATAPI Removable Media Device
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*/
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enum diskette_drive_types {
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DISKETTE_360K = 1,
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DISKETTE_1_2M = 2,
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DISKETTE_720K = 3,
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DISKETTE_1_44M = 4,
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DISKETTE_2_88M = 6,
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DISKETTE_ATAPI = 10,
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};
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/**
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* chs_to_lba - compute lba value from cylinder, head and sector number
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**/
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static inline int chs_to_lba(const struct driveinfo *drive_info,
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const unsigned int cylinder,
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const unsigned int head, const unsigned int sector)
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{
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/* Use EDD, if valid */
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if (drive_info->edd_params.sectors_per_track > 0 &&
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drive_info->edd_params.heads > 0)
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return (sector - 1) +
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(head * drive_info->edd_params.sectors_per_track) +
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(cylinder * (drive_info->edd_params.heads) *
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drive_info->edd_params.sectors_per_track);
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else if (drive_info->cbios)
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return (sector - 1) + (head * drive_info->legacy_sectors_per_track) +
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(cylinder * (drive_info->legacy_max_head + 1) *
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drive_info->legacy_sectors_per_track);
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}
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void lba_to_chs(const struct driveinfo *drive_info, const int lba,
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unsigned int *cylinder, unsigned int *head,
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unsigned int *sector);
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int get_drive_parameters(struct driveinfo *drive_info);
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#endif /* _GEOM_H */
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