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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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* linux/include/linux/edd.h

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* by Matt Domsch <Matt_Domsch@dell.com>

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* structures and definitions for the int 13h, ax={41,48}h

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* BIOS Enhanced Disk Drive Services

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* This is based on the T13 group document D1572 Revision 0 (August 14 2002)

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* available at http://www.t13.org/docs2002/d1572r0.pdf. It is

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* very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf

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* In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch

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* table in the boot_params that contains a list of BIOS-enumerated

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* boot devices.

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* In arch/{i386,x86_64}/kernel/setup.c, this information is

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* transferred into the edd structure, and in drivers/firmware/edd.c, that

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* information is used to identify BIOS boot disk. The code in setup.S

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* is very sensitive to the size of these structures.

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* This program is free software; you can redistribute it and/or modify

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* it under the terms of the GNU General Public License v2.0 as published by

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* the Free Software Foundation

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* This program is distributed in the hope that it will be useful,

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* but WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

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* GNU General Public License for more details.

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#ifndef _LINUX_EDD_H

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#define _LINUX_EDD_H

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#include <linux/types.h>

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#define EDDNR 0x1e9 /* addr of number of edd_info structs at EDDBUF

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in boot_params - treat this as 1 byte */

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#define EDDBUF 0xd00 /* addr of edd_info structs in boot_params */

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#define EDDMAXNR 6 /* number of edd_info structs starting at EDDBUF */

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#define EDDEXTSIZE 8 /* change these if you muck with the structures */

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#define EDDPARMSIZE 74

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#define CHECKEXTENSIONSPRESENT 0x41

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#define GETDEVICEPARAMETERS 0x48

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#define LEGACYGETDEVICEPARAMETERS 0x08

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#define EDDMAGIC1 0x55AA

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#define EDDMAGIC2 0xAA55

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#define READ_SECTORS 0x02 /* int13 AH=0x02 is READ_SECTORS command */

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#define EDD_MBR_SIG_OFFSET 0x1B8 /* offset of signature in the MBR */

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#define EDD_MBR_SIG_BUF 0x290 /* addr in boot params */

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#define EDD_MBR_SIG_MAX 16 /* max number of signatures to store */

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#define EDD_MBR_SIG_NR_BUF 0x1ea /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF

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in boot_params - treat this as 1 byte */

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#ifndef __ASSEMBLY__

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#define EDD_EXT_FIXED_DISK_ACCESS (1 << 0)

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#define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)

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#define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)

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#define EDD_EXT_64BIT_EXTENSIONS (1 << 3)

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#define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)

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#define EDD_INFO_GEOMETRY_VALID (1 << 1)

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#define EDD_INFO_REMOVABLE (1 << 2)

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#define EDD_INFO_WRITE_VERIFY (1 << 3)

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#define EDD_INFO_MEDIA_CHANGE_NOTIFICATION (1 << 4)

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#define EDD_INFO_LOCKABLE (1 << 5)

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#define EDD_INFO_NO_MEDIA_PRESENT (1 << 6)

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#define EDD_INFO_USE_INT13_FN50 (1 << 7)

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struct edd_device_params {

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__u16 length;

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__u16 info_flags;

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__u32 num_default_cylinders;

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__u32 num_default_heads;

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__u32 sectors_per_track;

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__u64 number_of_sectors;

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__u16 bytes_per_sector;

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__u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */

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__u16 key; /* = 0xBEDD */

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__u8 device_path_info_length; /* = 44 */

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__u8 reserved2;

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__u16 reserved3;

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__u8 host_bus_type[4];

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__u8 interface_type[8];

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union {

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struct {

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__u16 base_address;

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__u16 reserved1;

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__u32 reserved2;

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} __attribute__ ((packed)) isa;

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struct {

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__u8 bus;

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__u8 slot;

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__u8 function;

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__u8 channel;

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__u32 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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__u64 reserved;

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} __attribute__ ((packed)) ibnd;

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struct {

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__u64 reserved;

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} __attribute__ ((packed)) xprs;

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struct {

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__u64 reserved;

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} __attribute__ ((packed)) htpt;

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struct {

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__u64 reserved;

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} __attribute__ ((packed)) unknown;

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} interface_path;

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union {

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struct {

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__u8 device;

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__u8 reserved1;

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__u16 reserved2;

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__u32 reserved3;

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__u64 reserved4;

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} __attribute__ ((packed)) ata;

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struct {

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__u8 device;

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__u8 lun;

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__u8 reserved1;

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__u8 reserved2;

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__u32 reserved3;

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__u64 reserved4;

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} __attribute__ ((packed)) atapi;

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struct {

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__u16 id;

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__u64 lun;

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__u16 reserved1;

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__u32 reserved2;

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} __attribute__ ((packed)) scsi;

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struct {

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__u64 serial_number;

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__u64 reserved;

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} __attribute__ ((packed)) usb;

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struct {

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__u64 eui;

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__u64 reserved;

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} __attribute__ ((packed)) i1394;

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struct {

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__u64 wwid;

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__u64 lun;

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} __attribute__ ((packed)) fibre;

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struct {

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__u64 identity_tag;

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__u64 reserved;

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} __attribute__ ((packed)) i2o;

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struct {

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__u32 array_number;

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__u32 reserved1;

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__u64 reserved2;

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} __attribute__ ((packed)) raid;

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struct {

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__u8 device;

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__u8 reserved1;

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__u16 reserved2;

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__u32 reserved3;

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__u64 reserved4;

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} __attribute__ ((packed)) sata;

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struct {

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__u64 reserved1;

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__u64 reserved2;

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} __attribute__ ((packed)) unknown;

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} device_path;

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__u8 reserved4;

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__u8 checksum;

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} __attribute__ ((packed));

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struct edd_info {

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__u8 device;

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__u8 version;

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__u16 interface_support;

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__u16 legacy_max_cylinder;

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__u8 legacy_max_head;

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__u8 legacy_sectors_per_track;

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struct edd_device_params params;

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} __attribute__ ((packed));

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struct edd {

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unsigned int mbr_signature[EDD_MBR_SIG_MAX];

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struct edd_info edd_info[EDDMAXNR];

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unsigned char mbr_signature_nr;

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unsigned char edd_info_nr;

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};

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#endif /*!__ASSEMBLY__ */

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#endif /* _LINUX_EDD_H */

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