1 /* SPDX-License-Identifier: GPL-2.0 */
3 * linux/arch/nds32/include/asm/setup.h
5 * Copyright (C) 1997-1999 Russell King
6 * Copyright (C) 2008 Andes Technology Corporation
7 * Copyright (C) 2013 Ken Kuo (ken_kuo@andestech.com)
9 * Structure passed to kernel to tell it about the
10 * hardware it's running on. See Documentation/arm/Setup
13 #ifndef __ASMNDS32_SETUP_H
14 #define __ASMNDS32_SETUP_H
16 #define COMMAND_LINE_SIZE 256
18 /* The list ends with an ATAG_NONE node. */
19 #define ATAG_NONE 0x00000000
26 /* The list must start with an ATAG_CORE node */
27 #define ATAG_CORE 0x54410001
30 u32 flags; /* bit 0 = read-only */
35 /* it is allowed to have multiple ATAG_MEM nodes */
36 #define ATAG_MEM 0x54410002
40 u32 start; /* physical start address */
43 /* VGA text type displays */
44 #define ATAG_VIDEOTEXT 0x54410003
46 struct tag_videotext {
58 /* describes how the ramdisk will be used in kernel */
59 #define ATAG_RAMDISK 0x54410004
62 u32 flags; /* bit 0 = load, bit 1 = prompt */
63 u32 size; /* decompressed ramdisk size in _kilo_ bytes */
64 u32 start; /* starting block of floppy-based RAM disk image */
68 * this one accidentally used virtual addresses - as such,
70 * describes where the compressed ramdisk image lives (virtual address)
72 #define ATAG_INITRD 0x54410005
74 /* describes where the compressed ramdisk image lives (physical address) */
75 #define ATAG_INITRD2 0x54420005
78 u32 start; /* physical start address */
79 u32 size; /* size of compressed ramdisk image in bytes */
82 /* board serial number. "64 bits should be enough for everybody" */
83 #define ATAG_SERIAL 0x54410006
91 #define ATAG_REVISION 0x54410007
97 /* initial values for vesafb-type framebuffers. see struct screen_info
98 * in include/linux/tty.h
100 #define ATAG_VIDEOLFB 0x54410008
102 struct tag_videolfb {
119 /* command line: \0 terminated string */
120 #define ATAG_CMDLINE 0x54410009
123 char cmdline[COMMAND_LINE_SIZE];
127 struct tag_header hdr;
129 struct tag_core core;
130 struct tag_mem32 mem;
131 struct tag_videotext videotext;
132 struct tag_ramdisk ramdisk;
133 struct tag_initrd initrd;
134 struct tag_serialnr serialnr;
135 struct tag_revision revision;
136 struct tag_videolfb videolfb;
137 struct tag_cmdline cmdline;
143 int (*parse)(const struct tag *);
146 #define tag_member_present(tag, member) \
147 ((unsigned long)(&((struct tag *)0L)->member + 1) \
148 <= (tag)->hdr.size * 4)
150 #define tag_next(t) ((struct tag *)((u32 *)(t) + (t)->hdr.size))
151 #define tag_size(type) ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
153 #define for_each_tag(t, base) \
154 for (t = base; t->hdr.size; t = tag_next(t))
158 #define __tag __used __attribute__((__section__(".taglist")))
159 #define __tagtable(tag, fn) \
160 static struct tagtable __tagtable_##fn __tag = { tag, fn }
163 * Memory map description
177 * Early command line parameters.
179 struct early_params {
181 void (*fn)(char **p);
184 #define __early_param(name, fn) \
185 static struct early_params __early_##fn __used \
186 __attribute__((__section__("__early_param"))) = { name, fn }