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 linux/Documentation/arm/Setup
15 * This file contains two ways to pass information from the boot
16 * loader to the kernel. The old struct param_struct is deprecated,
17 * but it will be kept in the kernel for 5 years from now
18 * (2001). This will allow boot loaders to convert to the new struct
21 #ifndef __ASMARM_SETUP_H
22 #define __ASMARM_SETUP_H
26 * - do not go blindly adding fields, add them at the end
27 * - when adding fields, don't rely on the address until
28 * a patch from me has been released
29 * - unused fields should be zero (for future expansion)
30 * - this structure is relatively short-lived - only
31 * guaranteed to contain useful data in setup_arch()
33 #define COMMAND_LINE_SIZE 1024
35 /* This is the old deprecated way to pass parameters to the kernel */
39 unsigned long page_size; /* 0 */
40 unsigned long nr_pages; /* 4 */
41 unsigned long ramdisk_size; /* 8 */
42 unsigned long flags; /* 12 */
43 #define FLAG_READONLY 1
45 #define FLAG_RDPROMPT 8
46 unsigned long rootdev; /* 16 */
47 unsigned long video_num_cols; /* 20 */
48 unsigned long video_num_rows; /* 24 */
49 unsigned long video_x; /* 28 */
50 unsigned long video_y; /* 32 */
51 unsigned long memc_control_reg; /* 36 */
52 unsigned char sounddefault; /* 40 */
53 unsigned char adfsdrives; /* 41 */
54 unsigned char bytes_per_char_h; /* 42 */
55 unsigned char bytes_per_char_v; /* 43 */
56 unsigned long pages_in_bank[4]; /* 44 */
57 unsigned long pages_in_vram; /* 60 */
58 unsigned long initrd_start; /* 64 */
59 unsigned long initrd_size; /* 68 */
60 unsigned long rd_start; /* 72 */
61 unsigned long system_rev; /* 76 */
62 unsigned long system_serial_low; /* 80 */
63 unsigned long system_serial_high; /* 84 */
64 unsigned long mem_fclk_21285; /* 88 */
72 char n[1024 - sizeof(unsigned long)];
75 char commandline[COMMAND_LINE_SIZE];
81 * The new way of passing information: a list of tagged entries
84 /* The list ends with an ATAG_NONE node. */
85 #define ATAG_NONE 0x00000000
92 /* The list must start with an ATAG_CORE node */
93 #define ATAG_CORE 0x54410001
96 u32 flags; /* bit 0 = read-only */
101 /* it is allowed to have multiple ATAG_MEM nodes */
102 #define ATAG_MEM 0x54410002
106 u32 start; /* physical start address */
109 /* VGA text type displays */
110 #define ATAG_VIDEOTEXT 0x54410003
112 struct tag_videotext {
124 /* describes how the ramdisk will be used in kernel */
125 #define ATAG_RAMDISK 0x54410004
128 u32 flags; /* bit 0 = load, bit 1 = prompt */
129 u32 size; /* decompressed ramdisk size in _kilo_ bytes */
130 u32 start; /* starting block of floppy-based RAM disk image */
133 /* describes where the compressed ramdisk image lives (virtual address) */
135 * this one accidentally used virtual addresses - as such,
138 #define ATAG_INITRD 0x54410005
140 /* describes where the compressed ramdisk image lives (physical address) */
141 #define ATAG_INITRD2 0x54420005
144 u32 start; /* physical start address */
145 u32 size; /* size of compressed ramdisk image in bytes */
148 /* board serial number. "64 bits should be enough for everybody" */
149 #define ATAG_SERIAL 0x54410006
151 struct tag_serialnr {
157 #define ATAG_REVISION 0x54410007
159 struct tag_revision {
163 /* initial values for vesafb-type framebuffers. see struct screen_info
164 * in include/linux/tty.h
166 #define ATAG_VIDEOLFB 0x54410008
168 struct tag_videolfb {
185 /* command line: \0 terminated string */
186 #define ATAG_CMDLINE 0x54410009
189 char cmdline[1]; /* this is the minimum size */
192 /* acorn RiscPC specific information */
193 #define ATAG_ACORN 0x41000101
196 u32 memc_control_reg;
202 /* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
203 #define ATAG_MEMCLK 0x41000402
210 struct tag_header hdr;
212 struct tag_core core;
213 struct tag_mem32 mem;
214 struct tag_videotext videotext;
215 struct tag_ramdisk ramdisk;
216 struct tag_initrd initrd;
217 struct tag_serialnr serialnr;
218 struct tag_revision revision;
219 struct tag_videolfb videolfb;
220 struct tag_cmdline cmdline;
225 struct tag_acorn acorn;
230 struct tag_memclk memclk;
236 int (*parse)(const struct tag *);
239 #define __tag __attribute__((unused, __section__(".taglist")))
240 #define __tagtable(tag, fn) \
241 static struct tagtable __tagtable_##fn __tag = { tag, fn }
243 #define tag_member_present(tag,member) \
244 ((unsigned long)(&((struct tag *)0L)->member + 1) \
245 <= (tag)->hdr.size * 4)
247 #define tag_next(t) ((struct tag *)((u32 *)(t) + (t)->hdr.size))
248 #define tag_size(type) ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
250 #define for_each_tag(t,base) \
251 for (t = base; t->hdr.size; t = tag_next(t))
254 * Memory map description
268 extern struct meminfo meminfo;