1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 M. Warner Losh. 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__ */ 131