1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2/*
  3 *  linux/include/asm/setup.h
  4 *
  5 *  Copyright (C) 1997-1999 Russell King
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10 *
 11 *  Structure passed to kernel to tell it about the
 12 *  hardware it's running on.  See Documentation/arm/setup.rst
 13 *  for more info.
 14 */
 15#ifndef _UAPI__ASMARM_SETUP_H
 16#define _UAPI__ASMARM_SETUP_H
 17
 18#include <linux/types.h>
 19
 20#define COMMAND_LINE_SIZE 1024
 21
 22/* The list ends with an ATAG_NONE node. */
 23#define ATAG_NONE	0x00000000
 24
 25struct tag_header {
 26	__u32 size;
 27	__u32 tag;
 28};
 29
 30/* The list must start with an ATAG_CORE node */
 31#define ATAG_CORE	0x54410001
 32
 33struct tag_core {
 34	__u32 flags;		/* bit 0 = read-only */
 35	__u32 pagesize;
 36	__u32 rootdev;
 37};
 38
 39/* it is allowed to have multiple ATAG_MEM nodes */
 40#define ATAG_MEM	0x54410002
 41
 42struct tag_mem32 {
 43	__u32	size;
 44	__u32	start;	/* physical start address */
 45};
 46
 47/* VGA text type displays */
 48#define ATAG_VIDEOTEXT	0x54410003
 49
 50struct tag_videotext {
 51	__u8		x;
 52	__u8		y;
 53	__u16		video_page;
 54	__u8		video_mode;
 55	__u8		video_cols;
 56	__u16		video_ega_bx;
 57	__u8		video_lines;
 58	__u8		video_isvga;
 59	__u16		video_points;
 60};
 61
 62/* describes how the ramdisk will be used in kernel */
 63#define ATAG_RAMDISK	0x54410004
 64
 65struct tag_ramdisk {
 66	__u32 flags;	/* bit 0 = load, bit 1 = prompt */
 67	__u32 size;	/* decompressed ramdisk size in _kilo_ bytes */
 68	__u32 start;	/* starting block of floppy-based RAM disk image */
 69};
 70
 71/* describes where the compressed ramdisk image lives (virtual address) */
 72/*
 73 * this one accidentally used virtual addresses - as such,
 74 * it's deprecated.
 75 */
 76#define ATAG_INITRD	0x54410005
 77
 78/* describes where the compressed ramdisk image lives (physical address) */
 79#define ATAG_INITRD2	0x54420005
 80
 81struct tag_initrd {
 82	__u32 start;	/* physical start address */
 83	__u32 size;	/* size of compressed ramdisk image in bytes */
 84};
 85
 86/* board serial number. "64 bits should be enough for everybody" */
 87#define ATAG_SERIAL	0x54410006
 88
 89struct tag_serialnr {
 90	__u32 low;
 91	__u32 high;
 92};
 93
 94/* board revision */
 95#define ATAG_REVISION	0x54410007
 96
 97struct tag_revision {
 98	__u32 rev;
 99};
100
101/* initial values for vesafb-type framebuffers. see struct screen_info
102 * in include/linux/tty.h
103 */
104#define ATAG_VIDEOLFB	0x54410008
105
106struct tag_videolfb {
107	__u16		lfb_width;
108	__u16		lfb_height;
109	__u16		lfb_depth;
110	__u16		lfb_linelength;
111	__u32		lfb_base;
112	__u32		lfb_size;
113	__u8		red_size;
114	__u8		red_pos;
115	__u8		green_size;
116	__u8		green_pos;
117	__u8		blue_size;
118	__u8		blue_pos;
119	__u8		rsvd_size;
120	__u8		rsvd_pos;
121};
122
123/* command line: \0 terminated string */
124#define ATAG_CMDLINE	0x54410009
125
126struct tag_cmdline {
127	char	cmdline[1];	/* this is the minimum size */
128};
129
130/* acorn RiscPC specific information */
131#define ATAG_ACORN	0x41000101
132
133struct tag_acorn {
134	__u32 memc_control_reg;
135	__u32 vram_pages;
136	__u8 sounddefault;
137	__u8 adfsdrives;
138};
139
140/* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
141#define ATAG_MEMCLK	0x41000402
142
143struct tag_memclk {
144	__u32 fmemclk;
145};
146
147struct tag {
148	struct tag_header hdr;
149	union {
150		struct tag_core		core;
151		struct tag_mem32	mem;
152		struct tag_videotext	videotext;
153		struct tag_ramdisk	ramdisk;
154		struct tag_initrd	initrd;
155		struct tag_serialnr	serialnr;
156		struct tag_revision	revision;
157		struct tag_videolfb	videolfb;
158		struct tag_cmdline	cmdline;
159
160		/*
161		 * Acorn specific
162		 */
163		struct tag_acorn	acorn;
164
165		/*
166		 * DC21285 specific
167		 */
168		struct tag_memclk	memclk;
169	} u;
170};
171
172struct tagtable {
173	__u32 tag;
174	int (*parse)(const struct tag *);
175};
176
177#define tag_member_present(tag,member)				\
178	((unsigned long)(&((struct tag *)0L)->member + 1)	\
179		<= (tag)->hdr.size * 4)
180
181#define tag_next(t)	((struct tag *)((__u32 *)(t) + (t)->hdr.size))
182#define tag_size(type)	((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
183
184#define for_each_tag(t,base)		\
185	for (t = base; t->hdr.size; t = tag_next(t))
186
187
188#endif /* _UAPI__ASMARM_SETUP_H */