2 * linux/include/asm/setup.h
4 * Copyright (C) 1997-1999 Russell King
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.
10 * Structure passed to kernel to tell it about the
11 * hardware it's running on. See Documentation/arm/Setup
14 #ifndef __ASMARM_SETUP_H
15 #define __ASMARM_SETUP_H
17 #define COMMAND_LINE_SIZE 1024
19 /* The list ends with an ATAG_NONE node. */
20 #define ATAG_NONE 0x00000000
27 /* The list must start with an ATAG_CORE node */
28 #define ATAG_CORE 0x54410001
31 u32 flags; /* bit 0 = read-only */
36 /* it is allowed to have multiple ATAG_MEM nodes */
37 #define ATAG_MEM 0x54410002
41 u32 start; /* physical start address */
44 /* VGA text type displays */
45 #define ATAG_VIDEOTEXT 0x54410003
47 struct tag_videotext {
59 /* describes how the ramdisk will be used in kernel */
60 #define ATAG_RAMDISK 0x54410004
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 */
68 /* describes where the compressed ramdisk image lives */
70 * this one accidentally used virtual addresses - as such,
73 #define ATAG_INITRD 0x54410005
75 /* describes where the compressed ramdisk image lives */
76 #define ATAG_INITRD2 0x54420005
79 u32 start; /* physical start address */
80 u32 size; /* size of compressed ramdisk image in bytes */
83 /* board serial number. "64 bits should be enough for everybody" */
84 #define ATAG_SERIAL 0x54410006
92 #define ATAG_REVISION 0x54410007
98 /* initial values for vesafb-type framebuffers. see struct screen_info
99 * in include/linux/tty.h
101 #define ATAG_VIDEOLFB 0x54410008
103 struct tag_videolfb {
120 /* command line: \0 terminated string */
121 #define ATAG_CMDLINE 0x54410009
124 char cmdline[1]; /* this is the minimum size */
127 /* acorn RiscPC specific information */
128 #define ATAG_ACORN 0x41000101
131 u32 memc_control_reg;
137 /* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
138 #define ATAG_MEMCLK 0x41000402
145 struct tag_header hdr;
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;
160 struct tag_acorn acorn;
165 struct tag_memclk memclk;
171 int (*parse)(const struct tag *);
174 #define __tag __attribute_used__ __attribute__((__section__(".taglist")))
175 #define __tagtable(tag, fn) \
176 static struct tagtable __tagtable_##fn __tag = { tag, fn }
178 #define tag_member_present(tag,member) \
179 ((unsigned long)(&((struct tag *)0L)->member + 1) \
180 <= (tag)->hdr.size * 4)
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)
185 #define for_each_tag(t,base) \
186 for (t = base; t->hdr.size; t = tag_next(t))
189 * Memory map description
203 extern struct meminfo meminfo;