1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 28 #ifndef __MACHINE_ATAGS_H__ 29 #define __MACHINE_ATAGS_H__ 30 31 /* 32 * Linux boot ABI compatable ATAG definitions. All these structures 33 * assume tight packing, but since they are all uint32_t's, I've not 34 * bothered to do the usual alignment dance. 35 */ 36 37 #define LBABI_MAX_COMMAND_LINE 1024 38 39 struct arm_lbabi_header 40 { 41 uint32_t size; /* Size of this node, including header */ 42 uint32_t tag; /* Node type */ 43 }; 44 45 #define ATAG_NONE 0x00000000 /* End of atags list */ 46 #define ATAG_CORE 0x54410001 /* List must start with ATAG_CORE */ 47 #define ATAG_MEM 0x54410002 /* Multiple ATAG_MEM nodes possible */ 48 #define ATAG_VIDEOTEXT 0x54410003 /* Video parameters */ 49 #define ATAG_RAMDISK 0x54410004 /* Describes the ramdisk parameters */ 50 #define ATAG_INITRD 0x54410005 /* Deprecated ramdisk -- used va not pa */ 51 #define ATAG_INITRD2 0x54420005 /* compressed ramdisk image */ 52 #define ATAG_SERIAL 0x54410006 /* 64-bits of serial number */ 53 #define ATAG_REVISION 0x54410007 /* Board revision */ 54 #define ATAG_VIDEOLFB 0x54410008 /* vesafb framebuffer */ 55 #define ATAG_CMDLINE 0x54410009 /* Command line */ 56 57 /* 58 * ATAG_CORE data 59 */ 60 struct arm_lbabi_core 61 { 62 uint32_t flags; /* bit 0 == read-only */ 63 uint32_t pagesize; 64 uint32_t rootdev; 65 }; 66 67 /* 68 * ATAG_MEM data -- Can be more than one to describe different 69 * banks. 70 */ 71 struct arm_lbabi_mem32 72 { 73 uint32_t size; 74 uint32_t start; /* start of physical memory */ 75 }; 76 77 /* 78 * ATAG_INITRD2 - Compressed ramdisk image details 79 */ 80 struct arm_lbabi_initrd 81 { 82 uint32_t start; /* pa of start */ 83 uint32_t size; /* How big the ram disk is */ 84 }; 85 86 /* 87 * ATAG_SERIAL - serial number 88 */ 89 struct arm_lbabi_serial_number 90 { 91 uint32_t low; 92 uint32_t high; 93 }; 94 95 /* 96 * ATAG_REVISION - board revision 97 */ 98 struct arm_lbabi_revision 99 { 100 uint32_t rev; 101 }; 102 103 /* 104 * ATAG_CMDLINE - Command line from uboot 105 */ 106 struct arm_lbabi_command_line 107 { 108 char command[1]; /* Minimum command length */ 109 }; 110 111 struct arm_lbabi_tag 112 { 113 struct arm_lbabi_header tag_hdr; 114 union { 115 struct arm_lbabi_core tag_core; 116 struct arm_lbabi_mem32 tag_mem; 117 struct arm_lbabi_initrd tag_initrd; 118 struct arm_lbabi_serial_number tag_sn; 119 struct arm_lbabi_revision tag_rev; 120 struct arm_lbabi_command_line tag_cmd; 121 } u; 122 }; 123 124 #define ATAG_TAG(a) (a)->tag_hdr.tag 125 #define ATAG_SIZE(a) ((a)->tag_hdr.size * sizeof(uint32_t)) 126 #define ATAG_NEXT(a) (struct arm_lbabi_tag *)((char *)(a) + ATAG_SIZE(a)) 127 128 #endif /* __MACHINE_ATAGS_H__ */ 129