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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