Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * linux/include/asm/setup.h
3 *
4 * Copyright (C) 1997-1999 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Structure passed to kernel to tell it about the
11 * hardware it's running on. See Documentation/arm/Setup
12 * for more info.
13 */
14#ifndef __ASMARM_SETUP_H
15#define __ASMARM_SETUP_H
16
17#define COMMAND_LINE_SIZE 1024
18
19/* The list ends with an ATAG_NONE node. */
20#define ATAG_NONE 0x00000000
21
22struct tag_header {
23 u32 size;
24 u32 tag;
25};
26
27/* The list must start with an ATAG_CORE node */
28#define ATAG_CORE 0x54410001
29
30struct tag_core {
31 u32 flags; /* bit 0 = read-only */
32 u32 pagesize;
33 u32 rootdev;
34};
35
36/* it is allowed to have multiple ATAG_MEM nodes */
37#define ATAG_MEM 0x54410002
38
39struct tag_mem32 {
40 u32 size;
41 u32 start; /* physical start address */
42};
43
44/* VGA text type displays */
45#define ATAG_VIDEOTEXT 0x54410003
46
47struct tag_videotext {
48 u8 x;
49 u8 y;
50 u16 video_page;
51 u8 video_mode;
52 u8 video_cols;
53 u16 video_ega_bx;
54 u8 video_lines;
55 u8 video_isvga;
56 u16 video_points;
57};
58
59/* describes how the ramdisk will be used in kernel */
60#define ATAG_RAMDISK 0x54410004
61
62struct tag_ramdisk {
63 u32 flags; /* bit 0 = load, bit 1 = prompt */
64 u32 size; /* decompressed ramdisk size in _kilo_ bytes */
65 u32 start; /* starting block of floppy-based RAM disk image */
66};
67
68/* describes where the compressed ramdisk image lives */
69/*
70 * this one accidentally used virtual addresses - as such,
71 * its depreciated.
72 */
73#define ATAG_INITRD 0x54410005
74
75/* describes where the compressed ramdisk image lives */
76#define ATAG_INITRD2 0x54420005
77
78struct tag_initrd {
79 u32 start; /* physical start address */
80 u32 size; /* size of compressed ramdisk image in bytes */
81};
82
83/* board serial number. "64 bits should be enough for everybody" */
84#define ATAG_SERIAL 0x54410006
85
86struct tag_serialnr {
87 u32 low;
88 u32 high;
89};
90
91/* board revision */
92#define ATAG_REVISION 0x54410007
93
94struct tag_revision {
95 u32 rev;
96};
97
98/* initial values for vesafb-type framebuffers. see struct screen_info
99 * in include/linux/tty.h
100 */
101#define ATAG_VIDEOLFB 0x54410008
102
103struct tag_videolfb {
104 u16 lfb_width;
105 u16 lfb_height;
106 u16 lfb_depth;
107 u16 lfb_linelength;
108 u32 lfb_base;
109 u32 lfb_size;
110 u8 red_size;
111 u8 red_pos;
112 u8 green_size;
113 u8 green_pos;
114 u8 blue_size;
115 u8 blue_pos;
116 u8 rsvd_size;
117 u8 rsvd_pos;
118};
119
120/* command line: \0 terminated string */
121#define ATAG_CMDLINE 0x54410009
122
123struct tag_cmdline {
124 char cmdline[1]; /* this is the minimum size */
125};
126
127/* acorn RiscPC specific information */
128#define ATAG_ACORN 0x41000101
129
130struct tag_acorn {
131 u32 memc_control_reg;
132 u32 vram_pages;
133 u8 sounddefault;
134 u8 adfsdrives;
135};
136
137/* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
138#define ATAG_MEMCLK 0x41000402
139
140struct tag_memclk {
141 u32 fmemclk;
142};
143
144struct tag {
145 struct tag_header hdr;
146 union {
147 struct tag_core core;
148 struct tag_mem32 mem;
149 struct tag_videotext videotext;
150 struct tag_ramdisk ramdisk;
151 struct tag_initrd initrd;
152 struct tag_serialnr serialnr;
153 struct tag_revision revision;
154 struct tag_videolfb videolfb;
155 struct tag_cmdline cmdline;
156
157 /*
158 * Acorn specific
159 */
160 struct tag_acorn acorn;
161
162 /*
163 * DC21285 specific
164 */
165 struct tag_memclk memclk;
166 } u;
167};
168
169struct tagtable {
170 u32 tag;
171 int (*parse)(const struct tag *);
172};
173
174#define __tag __attribute_used__ __attribute__((__section__(".taglist")))
175#define __tagtable(tag, fn) \
176static struct tagtable __tagtable_##fn __tag = { tag, fn }
177
178#define tag_member_present(tag,member) \
179 ((unsigned long)(&((struct tag *)0L)->member + 1) \
180 <= (tag)->hdr.size * 4)
181
182#define tag_next(t) ((struct tag *)((u32 *)(t) + (t)->hdr.size))
183#define tag_size(type) ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
184
185#define for_each_tag(t,base) \
186 for (t = base; t->hdr.size; t = tag_next(t))
187
188/*
189 * Memory map description
190 */
191#define NR_BANKS 8
192
193struct meminfo {
194 int nr_banks;
195 unsigned long end;
196 struct {
197 unsigned long start;
198 unsigned long size;
199 int node;
200 } bank[NR_BANKS];
201};
202
203extern struct meminfo meminfo;
204
205#endif