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
  25 struct 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
  33 struct 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
  42 struct tag_mem32 {
  43         __u32   size;
  44         __u32   start;  /* physical start address */
  45 };
  46
  47 /* VGA text type displays */
  48 #define ATAG_VIDEOTEXT  0x54410003
  49
  50 struct 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
  65 struct 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
  81 struct 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
  89 struct tag_serialnr {
  90         __u32 low;
  91         __u32 high;
  92 };
  93
  94 /* board revision */
  95 #define ATAG_REVISION   0x54410007
  96
  97 struct 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
 106 struct 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
 126 struct tag_cmdline {
 127         char    cmdline[1];     /* this is the minimum size */
 128 };
 129
 130 /* acorn RiscPC specific information */
 131 #define ATAG_ACORN      0x41000101
 132
 133 struct 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
 143 struct tag_memclk {
 144         __u32 fmemclk;
 145 };
 146
 147 struct 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
 172 struct 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 */