The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/pc/bios.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1997 Michael Smith
    5  * Copyright (c) 1998 Jonathan Lemon
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: head/sys/i386/include/pc/bios.h 332489 2018-04-13 20:30:49Z kib $
   30  */
   31 
   32 #ifndef _MACHINE_PC_BIOS_H_
   33 #define _MACHINE_PC_BIOS_H_
   34 
   35 /* 
   36  * Signature structure for the BIOS32 Service Directory header 
   37  */
   38 struct bios32_SDheader 
   39 {
   40     u_int8_t    sig[4];
   41     u_int32_t   entry;
   42     u_int8_t    revision;
   43     u_int8_t    len;
   44     u_int8_t    cksum;
   45     u_int8_t    pad[5];
   46 };
   47 
   48 /* 
   49  * PnP BIOS presence structure
   50  */
   51 struct PnPBIOS_table 
   52 {
   53     u_int8_t    sig[4];                 /* "$PnP */
   54     u_int8_t    version;                /* should be 0x10 */
   55     u_int8_t    len;                    /* total structure length */
   56     u_int16_t   control;                /* BIOS feature flags */
   57     u_int8_t    cksum;                  /* checksum */
   58     u_int32_t   evflagaddr;             /* address of event notificaton flag */
   59     u_int16_t   rmentryoffset;          /* real-mode entry offset */
   60     u_int16_t   rmentryseg;             /*                 segment */
   61     u_int16_t   pmentryoffset;          /* protected-mode entry offset */
   62     u_int32_t   pmentrybase;            /*                segment base */
   63     u_int32_t   oemdevid;               /* motherboard EISA ID */
   64     u_int16_t   rmbiosseg;              /* real-mode BIOS segment */
   65     u_int32_t   pmdataseg;              /* protected-mode data segment */
   66 } __packed;
   67 
   68 /*
   69  * PnP BIOS return codes
   70  */
   71 #define PNP_SUCCESS                             0x00
   72 #define PNP_NOT_SET_STATICALLY                  0x7f
   73 #define PNP_UNKNOWN_FUNCTION                    0x81
   74 #define PNP_FUNCTION_NOT_SUPPORTED              0x82
   75 #define PNP_INVALID_HANDLE                      0x83
   76 #define PNP_BAD_PARAMETER                       0x84
   77 #define PNP_SET_FAILED                          0x85
   78 #define PNP_EVENTS_NOT_PENDING                  0x86
   79 #define PNP_SYSTEM_NOT_DOCKED                   0x87
   80 #define PNP_NO_ISA_PNP_CARDS                    0x88
   81 #define PNP_UNABLE_TO_DETERMINE_DOCK_CAPABILITIES 0x89
   82 #define PNP_CONFIG_CHANGE_FAILED_NO_BATTERY     0x8a
   83 #define PNP_CONFIG_CHANGE_FAILED_RESOURCE_CONFLICT 0x8b
   84 #define PNP_BUFFER_TOO_SMALL                    0x8c
   85 #define PNP_USE_ESCD_SUPPORT                    0x8d
   86 #define PNP_MESSAGE_NOT_SUPPORTED               0x8e
   87 #define PNP_HARDWARE_ERROR                      0x8f
   88 
   89 /*
   90  * DMI return codes
   91  */
   92 #define DMI_SUCCESS                             0x00
   93 #define DMI_UNKNOWN_FUNCTION                    0x81
   94 #define DMI_FUNCTION_NOT_SUPPORTED              0x82
   95 #define DMI_INVALID_HANDLE                      0x83
   96 #define DMI_BAD_PARAMETER                       0x84
   97 #define DMI_INVALID_SUBFUNCTION                 0x85
   98 #define DMI_NO_CHANGE                           0x86
   99 #define DMI_ADD_STRUCTURE_FAILED                0x87
  100 #define DMI_READ_ONLY                           0x8d
  101 #define DMI_LOCK_NOT_SUPPORTED                  0x90
  102 #define DMI_CURRENTLY_LOCKED                    0x91
  103 #define DMI_INVALID_LOCK                        0x92
  104 
  105 /*
  106  * format specifiers and defines for bios16()
  107  *     s        = short (16 bits)
  108  *     i        = int (32 bits)
  109  *     p        = pointer (converted to seg:offset)
  110  *     C,D,U    = selector (corresponding to code/data/utility segment)
  111  */
  112 #define PNP_COUNT_DEVNODES      "sppD",         0x00
  113 #define PNP_GET_DEVNODE         "sppsD",        0x01
  114 #define PNP_SET_DEVNODE         "sspsD",        0x02
  115 #define PNP_GET_EVENT           "spD",          0x03
  116 #define PNP_SEND_MSG            "ssD",          0x04
  117 #define PNP_GET_DOCK_INFO       "spD",          0x05
  118 
  119 #define PNP_SEL_PRIBOOT         "ssiiisspD",    0x07
  120 #define PNP_GET_PRIBOOT         "sspppppD",     0x08
  121 #define PNP_SET_RESINFO         "spD",          0x09
  122 #define PNP_GET_RESINFO         "spD",          0x0A
  123 #define PNP_GET_APM_ID          "sppD",         0x0B
  124 
  125 #define PNP_GET_ISA_INFO        "spD",          0x40
  126 #define PNP_GET_ECSD_INFO       "spppD",        0x41
  127 #define PNP_READ_ESCD           "spUD",         0x42
  128 #define PNP_WRITE_ESCD          "spUD",         0x43
  129 
  130 #define PNP_GET_DMI_INFO        "spppppD",      0x50
  131 #define PNP_GET_DMI_STRUCTURE   "sppUD",        0x51
  132 #define PNP_SET_DMI_STRUCTURE   "sppsUD"        0x52
  133 #define PNP_GET_DMI_CHANGE      "spUD"          0x53
  134 #define PNP_DMI_CONTROL         "sspsUD"        0x54
  135 #define PNP_GET_GPNV_INFO       "sppppD"        0x55
  136 #define PNP_READ_GPNV_DATA      "ssppUD"        0x56
  137 #define PNP_WRITE_GPNV_DATA     "sspsUD"        0x57
  138 
  139 #define PNP_BOOT_CHECK          "sp",           0x60
  140 #define PNP_COUNT_IPL           "sppp",         0x61
  141 #define PNP_GET_BOOTPRI         "spp",          0x62
  142 #define PNP_SET_BOOTPRI         "sp",           0x63
  143 #define PNP_GET_LASTBOOT        "sp",           0x64
  144 #define PNP_GET_BOOTFIRST       "sp",           0x65
  145 #define PNP_SET_BOOTFIRST       "sp",           0x66
  146 
  147 /*
  148  * PCI BIOS functions
  149  */
  150 #define PCIBIOS_BIOS_PRESENT            0xb101
  151 #define PCIBIOS_READ_CONFIG_BYTE        0xb108
  152 #define PCIBIOS_READ_CONFIG_WORD        0xb109
  153 #define PCIBIOS_READ_CONFIG_DWORD       0xb10a
  154 #define PCIBIOS_WRITE_CONFIG_BYTE       0xb10b
  155 #define PCIBIOS_WRITE_CONFIG_WORD       0xb10c
  156 #define PCIBIOS_WRITE_CONFIG_DWORD      0xb10d
  157 #define PCIBIOS_GET_IRQ_ROUTING         0xb10e
  158 #define PCIBIOS_ROUTE_INTERRUPT         0xb10f
  159 
  160 /*
  161  * PCI interrupt routing table.
  162  *
  163  * $PIR in the BIOS segment contains a PIR_table
  164  * int 1a:b106 returns PIR_table in buffer at es:(e)di 
  165  * int 1a:b18e returns PIR_table in buffer at es:(e)di 
  166  * int 1a:b406 returns es:di pointing to the BIOS PIR_table
  167  */
  168 struct PIR_header 
  169 {
  170     int8_t      ph_signature[4];
  171     u_int16_t   ph_version;
  172     u_int16_t   ph_length;
  173     u_int8_t    ph_router_bus;
  174     u_int8_t    ph_router_dev_fn;
  175     u_int16_t   ph_pci_irqs;
  176     u_int16_t   ph_router_vendor;
  177     u_int16_t   ph_router_device;
  178     u_int32_t   ph_miniport;
  179     u_int8_t    ph_res[11];
  180     u_int8_t    ph_checksum;
  181 } __packed;
  182 
  183 struct PIR_intpin 
  184 {
  185     u_int8_t    link;
  186     u_int16_t   irqs;
  187 } __packed;
  188 
  189 struct PIR_entry
  190 {
  191     u_int8_t            pe_bus;
  192     u_int8_t            pe_res1:3;
  193     u_int8_t            pe_device:5;
  194     struct PIR_intpin   pe_intpin[4];
  195     u_int8_t    pe_slot;
  196     u_int8_t    pe_res3;
  197 } __packed;
  198 
  199 struct PIR_table 
  200 {
  201     struct PIR_header   pt_header;
  202     struct PIR_entry    pt_entry[0];
  203 } __packed;
  204 
  205 /*
  206  * Int 15:E820 'SMAP' structure
  207  */
  208 #define SMAP_SIG        0x534D4150                      /* 'SMAP' */
  209 
  210 #define SMAP_TYPE_MEMORY        1
  211 #define SMAP_TYPE_RESERVED      2
  212 #define SMAP_TYPE_ACPI_RECLAIM  3
  213 #define SMAP_TYPE_ACPI_NVS      4
  214 #define SMAP_TYPE_ACPI_ERROR    5
  215 #define SMAP_TYPE_DISABLED      6
  216 #define SMAP_TYPE_PMEM          7
  217 #define SMAP_TYPE_PRAM          12
  218 
  219 #define SMAP_XATTR_ENABLED      0x00000001
  220 #define SMAP_XATTR_NON_VOLATILE 0x00000002
  221 #define SMAP_XATTR_MASK         (SMAP_XATTR_ENABLED | SMAP_XATTR_NON_VOLATILE)
  222 
  223 struct bios_smap {
  224     u_int64_t   base;
  225     u_int64_t   length;
  226     u_int32_t   type;
  227 } __packed;
  228 
  229 /* Structure extended to include extended attribute field in ACPI 3.0. */
  230 struct bios_smap_xattr {
  231     u_int64_t   base;
  232     u_int64_t   length;
  233     u_int32_t   type;
  234     u_int32_t   xattr;
  235 } __packed;
  236 
  237 /*
  238  * System Management BIOS
  239  */
  240 #define SMBIOS_START    0xf0000
  241 #define SMBIOS_STEP     0x10
  242 #define SMBIOS_OFF      0
  243 #define SMBIOS_LEN      4
  244 #define SMBIOS_SIG      "_SM_"
  245 
  246 struct smbios_eps {
  247         uint8_t         anchor_string[4];               /* '_SM_' */
  248         uint8_t         checksum;
  249         uint8_t         length;
  250         uint8_t         major_version;
  251         uint8_t         minor_version;
  252         uint16_t        maximum_structure_size;
  253         uint8_t         entry_point_revision;
  254         uint8_t         formatted_area[5];
  255         uint8_t         intermediate_anchor_string[5];  /* '_DMI_' */
  256         uint8_t         intermediate_checksum;
  257         uint16_t        structure_table_length;
  258         uint32_t        structure_table_address;
  259         uint16_t        number_structures;
  260         uint8_t         BCD_revision;
  261 };
  262 
  263 struct smbios_structure_header {
  264         uint8_t         type;
  265         uint8_t         length;
  266         uint16_t        handle;
  267 };
  268 
  269 #ifdef _KERNEL
  270 #define BIOS_PADDRTOVADDR(x)    ((x) + PMAP_MAP_LOW)
  271 #define BIOS_VADDRTOPADDR(x)    ((x) - PMAP_MAP_LOW)
  272 
  273 struct bios_oem_signature {
  274         char * anchor;          /* search anchor string in BIOS memory */
  275         size_t offset;          /* offset from anchor (may be negative) */
  276         size_t totlen;          /* total length of BIOS string to copy */
  277 } __packed;
  278 
  279 struct bios_oem_range {
  280         u_int from;             /* shouldn't be below 0xe0000 */
  281         u_int to;               /* shouldn't be above 0xfffff */
  282 } __packed;
  283 
  284 struct bios_oem {
  285         struct bios_oem_range range;
  286         struct bios_oem_signature signature[];
  287 } __packed;
  288 
  289 struct segment_info {
  290         u_int   base;
  291         u_int   limit;
  292 };
  293 
  294 #define BIOSCODE_FLAG   0x01
  295 #define BIOSDATA_FLAG   0x02
  296 #define BIOSUTIL_FLAG   0x04
  297 #define BIOSARGS_FLAG   0x08
  298 
  299 struct bios_segments {
  300         struct  segment_info code32;            /* 32-bit code (mandatory) */
  301         struct  segment_info code16;            /* 16-bit code */
  302         struct  segment_info data;              /* 16-bit data */
  303         struct  segment_info util;              /* 16-bit utility */
  304         struct  segment_info args;              /* 16-bit args */
  305 };
  306 
  307 struct bios_regs {
  308         u_int   eax;
  309         u_int   ebx;
  310         u_int   ecx;
  311         u_int   edx;
  312         u_int   esi;
  313         u_int   edi;
  314 };
  315 
  316 struct bios_args {
  317         u_int   entry;                          /* entry point of routine */
  318         struct  bios_regs r;
  319         struct  bios_segments seg;
  320 };
  321 
  322 /* 
  323  * BIOS32 Service Directory entry.  Caller supplies name, bios32_SDlookup
  324  * fills in the rest of the details.
  325  */
  326 struct bios32_SDentry 
  327 {
  328     union 
  329     {
  330         u_int8_t        name[4];        /* service identifier */
  331         u_int32_t       id;             /* as a 32-bit value */
  332     } ident;
  333     u_int32_t   base;                   /* base of service */
  334     u_int32_t   len;                    /* service length */
  335     u_int32_t   entry;                  /* entrypoint offset from base */
  336     vm_offset_t ventry;                 /* entrypoint in kernel virtual segment */
  337 };
  338 
  339 /*
  340  * Exported lookup results 
  341  */
  342 extern struct bios32_SDentry    PCIbios;
  343 
  344 int     bios_oem_strings(struct bios_oem *oem, u_char *buffer, size_t maxlen);
  345 uint32_t bios_sigsearch(uint32_t start, u_char *sig, int siglen, int paralen,
  346             int sigofs);
  347 int     bios16(struct bios_args *, char *, ...);
  348 int     bios16_call(struct bios_regs *, char *);
  349 int     bios32(struct bios_regs *, u_int, u_short);
  350 int     bios32_SDlookup(struct bios32_SDentry *ent);
  351 void    set_bios_selectors(struct bios_segments *, int);
  352 
  353 #endif
  354 
  355 #endif /* _MACHINE_PC_BIOS_H_ */

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