memdisk/mstructs.h

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2001-2009 H. Peter Anvin - All Rights Reserved
   4  *   Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
   5  *   Portions copyright 2009-2010 Shao Miller
   6  *                                [El Torito code, mBFT, "safe hook"]
   7  *
   8  *   This program is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
  11  *   Boston MA 02111-1307, USA; either version 2 of the License, or
  12  *   (at your option) any later version; incorporated herein by reference.
  13  *
  14  * ----------------------------------------------------------------------- */
  15
  16 /* These structures are common to MEMDISK and MDISKCHK.COM */
  17
  18 #include <stdint.h>
  19 #include "compiler.h"
  20
  21 struct seg_off {
  22     uint16_t offset;
  23     uint16_t segment;
  24 };
  25
  26 typedef union {
  27     struct seg_off seg_off;
  28     uint32_t uint32;
  29 } real_addr_t;
  30
  31 /* Forward declaration */
  32 struct mBFT;
  33
  34 MEMDISK_PACKED_PREFIX
  35 struct safe_hook {
  36     uint8_t jump[3];            /* Max. three bytes for jump */
  37     uint8_t signature[8];       /* "$INT13SF" */
  38     uint8_t vendor[8];          /* "MEMDISK " */
  39     real_addr_t old_hook;       /* SEG:OFF for previous INT 13h hook */
  40     uint32_t flags;             /* "Safe hook" flags */
  41     /* The next field is a MEMDISK extension to the "safe hook" structure */
  42     uint32_t mbft;
  43 } MEMDISK_PACKED_POSTFIX;
  44
  45 struct memdisk_header {
  46     uint16_t int13_offs;
  47     uint16_t int15_offs;
  48     uint16_t patch_offs;
  49     uint16_t total_size;
  50     uint16_t iret_offs;
  51     struct safe_hook safe_hook;
  52 };
  53
  54 MEMDISK_PACKED_PREFIX
  55 /* EDD disk parameter table */
  56 struct edd_dpt {
  57     uint16_t len;               /* Length of table */
  58     uint16_t flags;             /* Information flags */
  59     uint32_t c;                 /* Physical cylinders (count!) */
  60     uint32_t h;                 /* Physical heads (count!) */
  61     uint32_t s;                 /* Physical sectors/track (count!) */
  62     uint64_t sectors;           /* Total sectors */
  63     uint16_t bytespersec;       /* Bytes/sector */
  64     real_addr_t dpte;           /* DPTE pointer */
  65     uint16_t dpikey;            /* Device Path Info magic */
  66     uint8_t  dpilen;            /* Device Path Info length */
  67     uint8_t  res1;              /* Reserved */
  68     uint16_t res2;              /* Reserved */
  69     uint8_t  bustype[4];        /* Host bus type */
  70     uint8_t  inttype[8];        /* Interface type */
  71     uint64_t intpath;           /* Interface path */
  72     uint64_t devpath[2];        /* Device path (double QuadWord!) */
  73     uint8_t  res3;              /* Reserved */
  74     uint8_t  chksum;            /* DPI checksum */
  75 } MEMDISK_PACKED_POSTFIX;
  76
  77 /* Requirement for struct edd4_cd_pkt */
  78 #include "../memdisk/eltorito.h"
  79
  80 /* Official MEMDISK Info structure ("MDI") */
  81 MEMDISK_PACKED_PREFIX
  82 struct mdi {
  83     const uint16_t bytes;
  84     const uint8_t version_minor;
  85     const uint8_t version_major;
  86
  87     uint32_t diskbuf;
  88     uint32_t disksize;
  89     real_addr_t cmdline;
  90
  91     real_addr_t oldint13;
  92     real_addr_t oldint15;
  93
  94     uint16_t olddosmem;
  95     uint8_t bootloaderid;
  96     uint8_t sector_shift;
  97
  98     uint16_t dpt_ptr;
  99 } MEMDISK_PACKED_POSTFIX;
 100
 101 /* Requirement for struct acpi_description_header */
 102 #include "../memdisk/acpi.h"
 103
 104 MEMDISK_PACKED_PREFIX
 105 struct mBFT {
 106     struct acpi_description_header acpi;
 107     uint32_t safe_hook;         /* "Safe hook" physical address */
 108     struct mdi mdi;
 109 } MEMDISK_PACKED_POSTFIX;
 110
 111 /* The Disk Parameter Table may be required */
 112 typedef union {
 113     struct hd_dpt {
 114         uint16_t max_cyl;       /* Max cylinder */
 115         uint8_t max_head;       /* Max head */
 116         uint8_t junk1[5];       /* Obsolete junk, leave at zero */
 117         uint8_t ctrl;           /* Control byte */
 118         uint8_t junk2[7];       /* More obsolete junk */
 119     } hd;
 120     struct fd_dpt {
 121         uint8_t specify1;       /* "First specify byte" */
 122         uint8_t specify2;       /* "Second specify byte" */
 123         uint8_t delay;          /* Delay until motor turn off */
 124         uint8_t bps;            /* Bytes/sector (02h = 512) */
 125
 126         uint8_t sectors;        /* Sectors/track */
 127         uint8_t isgap;          /* Length of intersector gap */
 128         uint8_t dlen;           /* Data length (0FFh) */
 129         uint8_t fgap;           /* Formatting gap */
 130
 131         uint8_t ffill;          /* Format fill byte */
 132         uint8_t settle;         /* Head settle time (ms) */
 133         uint8_t mstart;         /* Motor start time */
 134         uint8_t maxtrack;       /* Maximum track number */
 135
 136         uint8_t rate;           /* Data transfer rate */
 137         uint8_t cmos;           /* CMOS type */
 138         uint8_t pad[2];
 139
 140         uint32_t old_fd_dpt;    /* Extension: pointer to old INT 1Eh */
 141     } fd;
 142 } dpt_t;
 143
 144 MEMDISK_PACKED_PREFIX
 145 struct patch_area {
 146     struct mdi mdi;
 147
 148     uint8_t driveshiftlimit;    /* Do not shift drives above this region */
 149     uint8_t _pad2;              /* Pad to DWORD */
 150     uint16_t _pad3;             /* Pad to QWORD */
 151
 152     uint16_t memint1588;
 153
 154     uint16_t cylinders;
 155     uint16_t heads;
 156     uint32_t sectors;
 157
 158     uint32_t mem1mb;
 159     uint32_t mem16mb;
 160
 161     uint8_t driveno;
 162     uint8_t drivetype;
 163     uint8_t drivecnt;
 164     uint8_t configflags;
 165
 166 #define CONFIG_READONLY 0x01
 167 #define CONFIG_RAW      0x02
 168 #define CONFIG_SAFEINT  0x04
 169 #define CONFIG_BIGRAW   0x08    /* MUST be 8! */
 170 #define CONFIG_MODEMASK 0x0e
 171
 172     uint16_t mystack;
 173     uint16_t statusptr;
 174
 175     dpt_t dpt;
 176     struct edd_dpt edd_dpt;
 177     struct edd4_cd_pkt cd_pkt;  /* Only really in a memdisk_iso_* hook */
 178 } MEMDISK_PACKED_POSTFIX;