The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/include/atags.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2012 M. Warner Losh <imp@FreeBSD.org>
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD$
   28  */
   29 
   30 #ifndef __MACHINE_ATAGS_H__
   31 #define __MACHINE_ATAGS_H__
   32 
   33 /*
   34  * Linux boot ABI compatable ATAG definitions.  All these structures
   35  * assume tight packing, but since they are all uint32_t's, I've not
   36  * bothered to do the usual alignment dance.
   37  */
   38 
   39 #define LBABI_MAX_COMMAND_LINE  1024
   40 
   41 struct arm_lbabi_header
   42 {
   43         uint32_t        size;           /* Size of this node, including header */
   44         uint32_t        tag;            /* Node type */
   45 };
   46 
   47 #define ATAG_NONE       0x00000000      /* End of atags list */
   48 #define ATAG_CORE       0x54410001      /* List must start with ATAG_CORE */
   49 #define ATAG_MEM        0x54410002      /* Multiple ATAG_MEM nodes possible */
   50 #define ATAG_VIDEOTEXT  0x54410003      /* Video parameters */
   51 #define ATAG_RAMDISK    0x54410004      /* Describes the ramdisk parameters */
   52 #define ATAG_INITRD     0x54410005      /* Deprecated ramdisk -- used va not pa */
   53 #define ATAG_INITRD2    0x54420005      /* compressed ramdisk image */
   54 #define ATAG_SERIAL     0x54410006      /* 64-bits of serial number */
   55 #define ATAG_REVISION   0x54410007      /* Board revision */
   56 #define ATAG_VIDEOLFB   0x54410008      /* vesafb framebuffer */
   57 #define ATAG_CMDLINE    0x54410009      /* Command line */
   58 
   59 /*
   60  * ATAG_CORE data
   61  */
   62 struct arm_lbabi_core
   63 {
   64         uint32_t flags;                 /* bit 0 == read-only */
   65         uint32_t pagesize;
   66         uint32_t rootdev;
   67 };
   68 
   69 /*
   70  * ATAG_MEM data -- Can be more than one to describe different
   71  * banks.
   72  */
   73 struct arm_lbabi_mem32
   74 {
   75         uint32_t size;
   76         uint32_t start;                 /* start of physical memory */
   77 };
   78 
   79 /*
   80  * ATAG_INITRD2 - Compressed ramdisk image details
   81  */
   82 struct arm_lbabi_initrd
   83 {
   84         uint32_t start;                 /* pa of start */
   85         uint32_t size;                  /* How big the ram disk is */
   86 };
   87 
   88 /*
   89  * ATAG_SERIAL - serial number
   90  */
   91 struct arm_lbabi_serial_number
   92 {
   93         uint32_t low;
   94         uint32_t high;
   95 };
   96 
   97 /*
   98  * ATAG_REVISION - board revision
   99  */
  100 struct arm_lbabi_revision
  101 {
  102         uint32_t rev;
  103 };
  104 
  105 /*
  106  * ATAG_CMDLINE - Command line from uboot
  107  */
  108 struct arm_lbabi_command_line
  109 {
  110         char command[1];                /* Minimum command length */
  111 };
  112 
  113 struct arm_lbabi_tag
  114 {
  115         struct arm_lbabi_header tag_hdr;
  116         union {
  117                 struct arm_lbabi_core tag_core;
  118                 struct arm_lbabi_mem32 tag_mem;
  119                 struct arm_lbabi_initrd tag_initrd;
  120                 struct arm_lbabi_serial_number tag_sn;
  121                 struct arm_lbabi_revision tag_rev;
  122                 struct arm_lbabi_command_line tag_cmd;
  123         } u;
  124 };
  125 
  126 #define ATAG_TAG(a)  (a)->tag_hdr.tag
  127 #define ATAG_SIZE(a) ((a)->tag_hdr.size * sizeof(uint32_t))
  128 #define ATAG_NEXT(a) (struct arm_lbabi_tag *)((char *)(a) + ATAG_SIZE(a))
  129 
  130 #endif /* __MACHINE_ATAGS_H__ */

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