1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * linux/include/asm/setup.h
4 *
5 * Copyright (C) 1997-1999 Russell King
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Structure passed to kernel to tell it about the
12 * hardware it's running on. See Documentation/arch/arm/setup.rst
13 * for more info.
14 */
15#ifndef __ASMARM_SETUP_H
16#define __ASMARM_SETUP_H
17
18#include <linux/types.h>
19
20#define COMMAND_LINE_SIZE 1024
21
22/* The list ends with an ATAG_NONE node. */
23#define ATAG_NONE 0x00000000
24
25struct tag_header {
26 __u32 size;
27 __u32 tag;
28};
29
30/* The list must start with an ATAG_CORE node */
31#define ATAG_CORE 0x54410001
32
33struct tag_core {
34 __u32 flags; /* bit 0 = read-only */
35 __u32 pagesize;
36 __u32 rootdev;
37};
38
39/* it is allowed to have multiple ATAG_MEM nodes */
40#define ATAG_MEM 0x54410002
41
42struct tag_mem32 {
43 __u32 size;
44 __u32 start; /* physical start address */
45};
46
47/* VGA text type displays */
48#define ATAG_VIDEOTEXT 0x54410003
49
50struct tag_videotext {
51 __u8 x;
52 __u8 y;
53 __u16 video_page;
54 __u8 video_mode;
55 __u8 video_cols;
56 __u16 video_ega_bx;
57 __u8 video_lines;
58 __u8 video_isvga;
59 __u16 video_points;
60};
61
62/* describes how the ramdisk will be used in kernel */
63#define ATAG_RAMDISK 0x54410004
64
65struct tag_ramdisk {
66 __u32 flags; /* bit 0 = load, bit 1 = prompt */
67 __u32 size; /* decompressed ramdisk size in _kilo_ bytes */
68 __u32 start; /* starting block of floppy-based RAM disk image */
69};
70
71/* describes where the compressed ramdisk image lives (virtual address) */
72/*
73 * this one accidentally used virtual addresses - as such,
74 * it's deprecated.
75 */
76#define ATAG_INITRD 0x54410005
77
78/* describes where the compressed ramdisk image lives (physical address) */
79#define ATAG_INITRD2 0x54420005
80
81struct tag_initrd {
82 __u32 start; /* physical start address */
83 __u32 size; /* size of compressed ramdisk image in bytes */
84};
85
86/* board serial number. "64 bits should be enough for everybody" */
87#define ATAG_SERIAL 0x54410006
88
89struct tag_serialnr {
90 __u32 low;
91 __u32 high;
92};
93
94/* board revision */
95#define ATAG_REVISION 0x54410007
96
97struct tag_revision {
98 __u32 rev;
99};
100
101/* initial values for vesafb-type framebuffers. see struct screen_info
102 * in include/linux/tty.h
103 */
104#define ATAG_VIDEOLFB 0x54410008
105
106struct tag_videolfb {
107 __u16 lfb_width;
108 __u16 lfb_height;
109 __u16 lfb_depth;
110 __u16 lfb_linelength;
111 __u32 lfb_base;
112 __u32 lfb_size;
113 __u8 red_size;
114 __u8 red_pos;
115 __u8 green_size;
116 __u8 green_pos;
117 __u8 blue_size;
118 __u8 blue_pos;
119 __u8 rsvd_size;
120 __u8 rsvd_pos;
121};
122
123/* command line: \0 terminated string */
124#define ATAG_CMDLINE 0x54410009
125
126struct tag_cmdline {
127 char cmdline[1]; /* this is the minimum size */
128};
129
130/* acorn RiscPC specific information */
131#define ATAG_ACORN 0x41000101
132
133struct tag_acorn {
134 __u32 memc_control_reg;
135 __u32 vram_pages;
136 __u8 sounddefault;
137 __u8 adfsdrives;
138};
139
140/* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
141#define ATAG_MEMCLK 0x41000402
142
143struct tag_memclk {
144 __u32 fmemclk;
145};
146
147struct tag {
148 struct tag_header hdr;
149 union {
150 struct tag_core core;
151 struct tag_mem32 mem;
152 struct tag_videotext videotext;
153 struct tag_ramdisk ramdisk;
154 struct tag_initrd initrd;
155 struct tag_serialnr serialnr;
156 struct tag_revision revision;
157 struct tag_videolfb videolfb;
158 struct tag_cmdline cmdline;
159
160 /*
161 * Acorn specific
162 */
163 struct tag_acorn acorn;
164
165 /*
166 * DC21285 specific
167 */
168 struct tag_memclk memclk;
169 } u;
170};
171
172struct tagtable {
173 __u32 tag;
174 int (*parse)(const struct tag *);
175};
176
177#define tag_member_present(tag,member) \
178 ((unsigned long)(&((struct tag *)0L)->member + 1) \
179 <= (tag)->hdr.size * 4)
180
181#define tag_next(t) ((struct tag *)((__u32 *)(t) + (t)->hdr.size))
182#define tag_size(type) ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
183
184#define for_each_tag(t,base) \
185 for (t = base; t->hdr.size; t = tag_next(t))
186
187
188#endif /* __ASMARM_SETUP_H */