include/asm-arm/setup.h

   1 /*
   2  *  linux/include/asm/setup.h
   3  *
   4  *  Copyright (C) 1997-1999 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Structure passed to kernel to tell it about the
  11  *  hardware it's running on.  See Documentation/arm/Setup
  12  *  for more info.
  13  */
  14 #ifndef __ASMARM_SETUP_H
  15 #define __ASMARM_SETUP_H
  16
  17 #define COMMAND_LINE_SIZE 1024
  18
  19 /* The list ends with an ATAG_NONE node. */
  20 #define ATAG_NONE       0x00000000
  21
  22 struct tag_header {
  23         u32 size;
  24         u32 tag;
  25 };
  26
  27 /* The list must start with an ATAG_CORE node */
  28 #define ATAG_CORE       0x54410001
  29
  30 struct tag_core {
  31         u32 flags;              /* bit 0 = read-only */
  32         u32 pagesize;
  33         u32 rootdev;
  34 };
  35
  36 /* it is allowed to have multiple ATAG_MEM nodes */
  37 #define ATAG_MEM        0x54410002
  38
  39 struct tag_mem32 {
  40         u32     size;
  41         u32     start;  /* physical start address */
  42 };
  43
  44 /* VGA text type displays */
  45 #define ATAG_VIDEOTEXT  0x54410003
  46
  47 struct tag_videotext {
  48         u8              x;
  49         u8              y;
  50         u16             video_page;
  51         u8              video_mode;
  52         u8              video_cols;
  53         u16             video_ega_bx;
  54         u8              video_lines;
  55         u8              video_isvga;
  56         u16             video_points;
  57 };
  58
  59 /* describes how the ramdisk will be used in kernel */
  60 #define ATAG_RAMDISK    0x54410004
  61
  62 struct tag_ramdisk {
  63         u32 flags;      /* bit 0 = load, bit 1 = prompt */
  64         u32 size;       /* decompressed ramdisk size in _kilo_ bytes */
  65         u32 start;      /* starting block of floppy-based RAM disk image */
  66 };
  67
  68 /* describes where the compressed ramdisk image lives (virtual address) */
  69 /*
  70  * this one accidentally used virtual addresses - as such,
  71  * it's deprecated.
  72  */
  73 #define ATAG_INITRD     0x54410005
  74
  75 /* describes where the compressed ramdisk image lives (physical address) */
  76 #define ATAG_INITRD2    0x54420005
  77
  78 struct tag_initrd {
  79         u32 start;      /* physical start address */
  80         u32 size;       /* size of compressed ramdisk image in bytes */
  81 };
  82
  83 /* board serial number. "64 bits should be enough for everybody" */
  84 #define ATAG_SERIAL     0x54410006
  85
  86 struct tag_serialnr {
  87         u32 low;
  88         u32 high;
  89 };
  90
  91 /* board revision */
  92 #define ATAG_REVISION   0x54410007
  93
  94 struct tag_revision {
  95         u32 rev;
  96 };
  97
  98 /* initial values for vesafb-type framebuffers. see struct screen_info
  99  * in include/linux/tty.h
 100  */
 101 #define ATAG_VIDEOLFB   0x54410008
 102
 103 struct tag_videolfb {
 104         u16             lfb_width;
 105         u16             lfb_height;
 106         u16             lfb_depth;
 107         u16             lfb_linelength;
 108         u32             lfb_base;
 109         u32             lfb_size;
 110         u8              red_size;
 111         u8              red_pos;
 112         u8              green_size;
 113         u8              green_pos;
 114         u8              blue_size;
 115         u8              blue_pos;
 116         u8              rsvd_size;
 117         u8              rsvd_pos;
 118 };
 119
 120 /* command line: \0 terminated string */
 121 #define ATAG_CMDLINE    0x54410009
 122
 123 struct tag_cmdline {
 124         char    cmdline[1];     /* this is the minimum size */
 125 };
 126
 127 /* acorn RiscPC specific information */
 128 #define ATAG_ACORN      0x41000101
 129
 130 struct tag_acorn {
 131         u32 memc_control_reg;
 132         u32 vram_pages;
 133         u8 sounddefault;
 134         u8 adfsdrives;
 135 };
 136
 137 /* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
 138 #define ATAG_MEMCLK     0x41000402
 139
 140 struct tag_memclk {
 141         u32 fmemclk;
 142 };
 143
 144 struct tag {
 145         struct tag_header hdr;
 146         union {
 147                 struct tag_core         core;
 148                 struct tag_mem32        mem;
 149                 struct tag_videotext    videotext;
 150                 struct tag_ramdisk      ramdisk;
 151                 struct tag_initrd       initrd;
 152                 struct tag_serialnr     serialnr;
 153                 struct tag_revision     revision;
 154                 struct tag_videolfb     videolfb;
 155                 struct tag_cmdline      cmdline;
 156
 157                 /*
 158                  * Acorn specific
 159                  */
 160                 struct tag_acorn        acorn;
 161
 162                 /*
 163                  * DC21285 specific
 164                  */
 165                 struct tag_memclk       memclk;
 166         } u;
 167 };
 168
 169 struct tagtable {
 170         u32 tag;
 171         int (*parse)(const struct tag *);
 172 };
 173
 174 #define __tag __attribute_used__ __attribute__((__section__(".taglist.init")))
 175 #define __tagtable(tag, fn) \
 176 static struct tagtable __tagtable_##fn __tag = { tag, fn }
 177
 178 #define tag_member_present(tag,member)                          \
 179         ((unsigned long)(&((struct tag *)0L)->member + 1)       \
 180                 <= (tag)->hdr.size * 4)
 181
 182 #define tag_next(t)     ((struct tag *)((u32 *)(t) + (t)->hdr.size))
 183 #define tag_size(type)  ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
 184
 185 #define for_each_tag(t,base)            \
 186         for (t = base; t->hdr.size; t = tag_next(t))
 187
 188 /*
 189  * Memory map description
 190  */
 191 #ifdef CONFIG_ARCH_LH7A40X
 192 # define NR_BANKS 16
 193 #else
 194 # define NR_BANKS 8
 195 #endif
 196
 197 struct meminfo {
 198         int nr_banks;
 199         struct {
 200                 unsigned long start;
 201                 unsigned long size;
 202                 int           node;
 203         } bank[NR_BANKS];
 204 };
 205
 206 /*
 207  * Early command line parameters.
 208  */
 209 struct early_params {
 210         const char *arg;
 211         void (*fn)(char **p);
 212 };
 213
 214 #define __early_param(name,fn)                                  \
 215 static struct early_params __early_##fn __attribute_used__      \
 216 __attribute__((__section__(".early_param.init"))) = { name, fn }
 217
 218 #endif