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  * Copyright (c) 2012 M. Warner Losh.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/11.0/sys/arm/include/atags.h 297285 2016-03-26 06:57:36Z mmel $
   27  */
   28 
   29 #ifndef __MACHINE_ATAGS_H__
   30 #define __MACHINE_ATAGS_H__
   31 
   32 /*
   33  * Linux boot ABI compatable ATAG definitions.  All these structures
   34  * assume tight packing, but since they are all uint32_t's, I've not
   35  * bothered to do the usual alignment dance.
   36  */
   37 
   38 #define LBABI_MAX_COMMAND_LINE  1024
   39 
   40 struct arm_lbabi_header
   41 {
   42         uint32_t        size;           /* Size of this node, including header */
   43         uint32_t        tag;            /* Node type */
   44 };
   45 
   46 #define ATAG_NONE       0x00000000      /* End of atags list */
   47 #define ATAG_CORE       0x54410001      /* List must start with ATAG_CORE */
   48 #define ATAG_MEM        0x54410002      /* Multiple ATAG_MEM nodes possible */
   49 #define ATAG_VIDEOTEXT  0x54410003      /* Video parameters */
   50 #define ATAG_RAMDISK    0x54410004      /* Describes the ramdisk parameters */
   51 #define ATAG_INITRD     0x54410005      /* Deprecated ramdisk -- used va not pa */
   52 #define ATAG_INITRD2    0x54420005      /* compressed ramdisk image */
   53 #define ATAG_SERIAL     0x54410006      /* 64-bits of serial number */
   54 #define ATAG_REVISION   0x54410007      /* Board revision */
   55 #define ATAG_VIDEOLFB   0x54410008      /* vesafb framebuffer */
   56 #define ATAG_CMDLINE    0x54410009      /* Command line */
   57 
   58 /*
   59  * ATAG_CORE data
   60  */
   61 struct arm_lbabi_core
   62 {
   63         uint32_t flags;                 /* bit 0 == read-only */
   64         uint32_t pagesize;
   65         uint32_t rootdev;
   66 };
   67 
   68 /*
   69  * ATAG_MEM data -- Can be more than one to describe different
   70  * banks.
   71  */
   72 struct arm_lbabi_mem32
   73 {
   74         uint32_t size;
   75         uint32_t start;                 /* start of physical memory */
   76 };
   77 
   78 /*
   79  * ATAG_INITRD2 - Compressed ramdisk image details
   80  */
   81 struct arm_lbabi_initrd
   82 {
   83         uint32_t start;                 /* pa of start */
   84         uint32_t size;                  /* How big the ram disk is */
   85 };
   86 
   87 /*
   88  * ATAG_SERIAL - serial number
   89  */
   90 struct arm_lbabi_serial_number
   91 {
   92         uint32_t low;
   93         uint32_t high;
   94 };
   95 
   96 /*
   97  * ATAG_REVISION - board revision
   98  */
   99 struct arm_lbabi_revision
  100 {
  101         uint32_t rev;
  102 };
  103 
  104 /*
  105  * ATAG_CMDLINE - Command line from uboot
  106  */
  107 struct arm_lbabi_command_line
  108 {
  109         char command[1];                /* Minimum command length */
  110 };
  111 
  112 struct arm_lbabi_tag
  113 {
  114         struct arm_lbabi_header tag_hdr;
  115         union {
  116                 struct arm_lbabi_core tag_core;
  117                 struct arm_lbabi_mem32 tag_mem;
  118                 struct arm_lbabi_initrd tag_initrd;
  119                 struct arm_lbabi_serial_number tag_sn;
  120                 struct arm_lbabi_revision tag_rev;
  121                 struct arm_lbabi_command_line tag_cmd;
  122         } u;
  123 };
  124 
  125 #define ATAG_TAG(a)  (a)->tag_hdr.tag
  126 #define ATAG_SIZE(a) ((a)->tag_hdr.size * sizeof(uint32_t))
  127 #define ATAG_NEXT(a) (struct arm_lbabi_tag *)((char *)(a) + ATAG_SIZE(a))
  128 
  129 #endif /* __MACHINE_ATAGS_H__ */

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