atags.h revision 297285
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: head/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 40struct 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 */ 61struct 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 */ 72struct 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 */ 81struct 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 */ 90struct arm_lbabi_serial_number 91{ 92 uint32_t low; 93 uint32_t high; 94}; 95 96/* 97 * ATAG_REVISION - board revision 98 */ 99struct arm_lbabi_revision 100{ 101 uint32_t rev; 102}; 103 104/* 105 * ATAG_CMDLINE - Command line from uboot 106 */ 107struct arm_lbabi_command_line 108{ 109 char command[1]; /* Minimum command length */ 110}; 111 112struct 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__ */ 130