2 * linux/arch/nds32/include/asm/setup.h
4 * Copyright (C) 1997-1999 Russell King
5 * Copyright (C) 2008 Andes Technology Corporation
6 * Copyright (C) 2013 Ken Kuo (ken_kuo@andestech.com)
7 * Copyright (C) 2017 Rick Chen (rick@andestech.com)
9 * SPDX-License-Identifier: GPL-2.0
11 * Structure passed to kernel to tell it about the
12 * hardware it's running on. See Documentation/arm/Setup
15 #ifndef __RISCV_SETUP_H
16 #define __RISCV_SETUP_H
18 #define COMMAND_LINE_SIZE 256
20 /* The list ends with an ATAG_NONE node. */
21 #define ATAG_NONE 0x00000000
28 /* The list must start with an ATAG_CORE node */
29 #define ATAG_CORE 0x54410001
32 u32 flags; /* bit 0 = read-only */
37 /* it is allowed to have multiple ATAG_MEM nodes */
38 #define ATAG_MEM 0x54410002
42 u32 start; /* physical start address */
45 /* VGA text type displays */
46 #define ATAG_VIDEOTEXT 0x54410003
48 struct tag_videotext {
60 /* describes how the ramdisk will be used in kernel */
61 #define ATAG_RAMDISK 0x54410004
64 u32 flags; /* bit 0 = load, bit 1 = prompt */
65 u32 size; /* decompressed ramdisk size in _kilo_ bytes */
66 u32 start; /* starting block of floppy-based RAM disk image */
70 * this one accidentally used virtual addresses - as such,
72 * describes where the compressed ramdisk image lives (virtual address)
74 #define ATAG_INITRD 0x54410005
76 /* describes where the compressed ramdisk image lives (physical address) */
77 #define ATAG_INITRD2 0x54420005
80 u32 start; /* physical start address */
81 u32 size; /* size of compressed ramdisk image in bytes */
84 /* board serial number. "64 bits should be enough for everybody" */
85 #define ATAG_SERIAL 0x54410006
93 #define ATAG_REVISION 0x54410007
99 /* initial values for vesafb-type framebuffers. see struct screen_info
100 * in include/linux/tty.h
102 #define ATAG_VIDEOLFB 0x54410008
104 struct tag_videolfb {
121 /* command line: \0 terminated string */
122 #define ATAG_CMDLINE 0x54410009
125 char cmdline[COMMAND_LINE_SIZE];
129 struct tag_header hdr;
131 struct tag_core core;
132 struct tag_mem32 mem;
133 struct tag_videotext videotext;
134 struct tag_ramdisk ramdisk;
135 struct tag_initrd initrd;
136 struct tag_serialnr serialnr;
137 struct tag_revision revision;
138 struct tag_videolfb videolfb;
139 struct tag_cmdline cmdline;
145 int (*parse)(const struct tag *);
148 #define tag_member_present(_tag, member) \
149 typeof(_tag) (tag) = (_tag); \
150 ((unsigned long)(&((struct tag *)0L)->member + 1) \
151 <= (tag)->hdr.size * 4)
153 #define tag_next(_t) \
154 typeof(_t) (t) = (_t); \
155 ((struct tag *)((u32 *)(t) + (t)->hdr.size))
156 #define tag_size(type) ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
158 #define for_each_tag(_t, base) \
159 typeof(_t) (t) = (_t); \
160 for (t = base; t->hdr.size; t = tag_next(t))
164 #define __tag __used __attribute__((__section__(".taglist")))
165 #define __tagtable(tag, fn) \
166 static struct tagtable __tagtable_##fn __tag = { tag, fn }
169 * Memory map description
183 * Early command line parameters.
185 struct early_params {
187 void (*fn)(char **p);
190 #define __early_param(name, fn) \
191 static struct early_params __early_##fn __used \
192 __attribute__((__section__("__early_param"))) = { name, fn }