uboot/include/linux/edd.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * linux/include/linux/edd.h
   4 *  Copyright (C) 2002, 2003, 2004 Dell Inc.
   5 *  by Matt Domsch <Matt_Domsch@dell.com>
   6 *
   7 * structures and definitions for the int 13h, ax={41,48}h
   8 * BIOS Enhanced Disk Drive Services
   9 * This is based on the T13 group document D1572 Revision 0 (August 14 2002)
  10 * available at http://www.t13.org/docs2002/d1572r0.pdf.  It is
  11 * very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf
  12 *
  13 * In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch
  14 * table in the boot_params that contains a list of BIOS-enumerated
  15 * boot devices.
  16 * In arch/{i386,x86_64}/kernel/setup.c, this information is
  17 * transferred into the edd structure, and in drivers/firmware/edd.c, that
  18 * information is used to identify BIOS boot disk.  The code in setup.S
  19 * is very sensitive to the size of these structures.
  20 */
  21#ifndef _LINUX_EDD_H
  22#define _LINUX_EDD_H
  23
  24#include <linux/types.h>
  25
  26#define EDDNR 0x1e9             /* addr of number of edd_info structs at EDDBUF
  27                                   in boot_params - treat this as 1 byte  */
  28#define EDDBUF  0xd00           /* addr of edd_info structs in boot_params */
  29#define EDDMAXNR 6              /* number of edd_info structs starting at EDDBUF  */
  30#define EDDEXTSIZE 8            /* change these if you muck with the structures */
  31#define EDDPARMSIZE 74
  32#define CHECKEXTENSIONSPRESENT 0x41
  33#define GETDEVICEPARAMETERS 0x48
  34#define LEGACYGETDEVICEPARAMETERS 0x08
  35#define EDDMAGIC1 0x55AA
  36#define EDDMAGIC2 0xAA55
  37
  38
  39#define READ_SECTORS 0x02         /* int13 AH=0x02 is READ_SECTORS command */
  40#define EDD_MBR_SIG_OFFSET 0x1B8  /* offset of signature in the MBR */
  41#define EDD_MBR_SIG_BUF    0x290  /* addr in boot params */
  42#define EDD_MBR_SIG_MAX 16        /* max number of signatures to store */
  43#define EDD_MBR_SIG_NR_BUF 0x1ea  /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
  44                                     in boot_params - treat this as 1 byte  */
  45
  46#ifndef __ASSEMBLY__
  47
  48#define EDD_EXT_FIXED_DISK_ACCESS           (1 << 0)
  49#define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
  50#define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
  51#define EDD_EXT_64BIT_EXTENSIONS            (1 << 3)
  52
  53#define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
  54#define EDD_INFO_GEOMETRY_VALID                (1 << 1)
  55#define EDD_INFO_REMOVABLE                     (1 << 2)
  56#define EDD_INFO_WRITE_VERIFY                  (1 << 3)
  57#define EDD_INFO_MEDIA_CHANGE_NOTIFICATION     (1 << 4)
  58#define EDD_INFO_LOCKABLE                      (1 << 5)
  59#define EDD_INFO_NO_MEDIA_PRESENT              (1 << 6)
  60#define EDD_INFO_USE_INT13_FN50                (1 << 7)
  61
  62struct edd_device_params {
  63        __u16 length;
  64        __u16 info_flags;
  65        __u32 num_default_cylinders;
  66        __u32 num_default_heads;
  67        __u32 sectors_per_track;
  68        __u64 number_of_sectors;
  69        __u16 bytes_per_sector;
  70        __u32 dpte_ptr;         /* 0xFFFFFFFF for our purposes */
  71        __u16 key;              /* = 0xBEDD */
  72        __u8 device_path_info_length;   /* = 44 */
  73        __u8 reserved2;
  74        __u16 reserved3;
  75        __u8 host_bus_type[4];
  76        __u8 interface_type[8];
  77        union {
  78                struct {
  79                        __u16 base_address;
  80                        __u16 reserved1;
  81                        __u32 reserved2;
  82                } __attribute__ ((packed)) isa;
  83                struct {
  84                        __u8 bus;
  85                        __u8 slot;
  86                        __u8 function;
  87                        __u8 channel;
  88                        __u32 reserved;
  89                } __attribute__ ((packed)) pci;
  90                /* pcix is same as pci */
  91                struct {
  92                        __u64 reserved;
  93                } __attribute__ ((packed)) ibnd;
  94                struct {
  95                        __u64 reserved;
  96                } __attribute__ ((packed)) xprs;
  97                struct {
  98                        __u64 reserved;
  99                } __attribute__ ((packed)) htpt;
 100                struct {
 101                        __u64 reserved;
 102                } __attribute__ ((packed)) unknown;
 103        } interface_path;
 104        union {
 105                struct {
 106                        __u8 device;
 107                        __u8 reserved1;
 108                        __u16 reserved2;
 109                        __u32 reserved3;
 110                        __u64 reserved4;
 111                } __attribute__ ((packed)) ata;
 112                struct {
 113                        __u8 device;
 114                        __u8 lun;
 115                        __u8 reserved1;
 116                        __u8 reserved2;
 117                        __u32 reserved3;
 118                        __u64 reserved4;
 119                } __attribute__ ((packed)) atapi;
 120                struct {
 121                        __u16 id;
 122                        __u64 lun;
 123                        __u16 reserved1;
 124                        __u32 reserved2;
 125                } __attribute__ ((packed)) scsi;
 126                struct {
 127                        __u64 serial_number;
 128                        __u64 reserved;
 129                } __attribute__ ((packed)) usb;
 130                struct {
 131                        __u64 eui;
 132                        __u64 reserved;
 133                } __attribute__ ((packed)) i1394;
 134                struct {
 135                        __u64 wwid;
 136                        __u64 lun;
 137                } __attribute__ ((packed)) fibre;
 138                struct {
 139                        __u64 identity_tag;
 140                        __u64 reserved;
 141                } __attribute__ ((packed)) i2o;
 142                struct {
 143                        __u32 array_number;
 144                        __u32 reserved1;
 145                        __u64 reserved2;
 146                } __attribute__ ((packed)) raid;
 147                struct {
 148                        __u8 device;
 149                        __u8 reserved1;
 150                        __u16 reserved2;
 151                        __u32 reserved3;
 152                        __u64 reserved4;
 153                } __attribute__ ((packed)) sata;
 154                struct {
 155                        __u64 reserved1;
 156                        __u64 reserved2;
 157                } __attribute__ ((packed)) unknown;
 158        } device_path;
 159        __u8 reserved4;
 160        __u8 checksum;
 161} __attribute__ ((packed));
 162
 163struct edd_info {
 164        __u8 device;
 165        __u8 version;
 166        __u16 interface_support;
 167        __u16 legacy_max_cylinder;
 168        __u8 legacy_max_head;
 169        __u8 legacy_sectors_per_track;
 170        struct edd_device_params params;
 171} __attribute__ ((packed));
 172
 173struct edd {
 174        unsigned int mbr_signature[EDD_MBR_SIG_MAX];
 175        struct edd_info edd_info[EDDMAXNR];
 176        unsigned char mbr_signature_nr;
 177        unsigned char edd_info_nr;
 178};
 179
 180#ifdef __KERNEL__
 181extern struct edd edd;
 182#endif /* __KERNEL__ */
 183#endif                          /*!__ASSEMBLY__ */
 184
 185#endif                          /* _LINUX_EDD_H */
 186
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