LXR linux/arch/arm/include/uapi/asm/setup.h

   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 */
 189