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 linux/Documentation/arm/Setup
  12  *  for more info.
  13  *
  14  * NOTE:
  15  *  This file contains two ways to pass information from the boot
  16  *  loader to the kernel. The old struct param_struct is deprecated,
  17  *  but it will be kept in the kernel for 5 years from now
  18  *  (2001). This will allow boot loaders to convert to the new struct
  19  *  tag way.
  20  */
  21 #ifndef __ASMARM_SETUP_H
  22 #define __ASMARM_SETUP_H
  23
  24 /*
  25  * Usage:
  26  *  - do not go blindly adding fields, add them at the end
  27  *  - when adding fields, don't rely on the address until
  28  *    a patch from me has been released
  29  *  - unused fields should be zero (for future expansion)
  30  *  - this structure is relatively short-lived - only
  31  *    guaranteed to contain useful data in setup_arch()
  32  */
  33 #define COMMAND_LINE_SIZE 1024
  34
  35 /* This is the old deprecated way to pass parameters to the kernel */
  36 struct param_struct {
  37     union {
  38         struct {
  39             unsigned long page_size;            /*  0 */
  40             unsigned long nr_pages;             /*  4 */
  41             unsigned long ramdisk_size;         /*  8 */
  42             unsigned long flags;                /* 12 */
  43 #define FLAG_READONLY   1
  44 #define FLAG_RDLOAD     4
  45 #define FLAG_RDPROMPT   8
  46             unsigned long rootdev;              /* 16 */
  47             unsigned long video_num_cols;       /* 20 */
  48             unsigned long video_num_rows;       /* 24 */
  49             unsigned long video_x;              /* 28 */
  50             unsigned long video_y;              /* 32 */
  51             unsigned long memc_control_reg;     /* 36 */
  52             unsigned char sounddefault;         /* 40 */
  53             unsigned char adfsdrives;           /* 41 */
  54             unsigned char bytes_per_char_h;     /* 42 */
  55             unsigned char bytes_per_char_v;     /* 43 */
  56             unsigned long pages_in_bank[4];     /* 44 */
  57             unsigned long pages_in_vram;        /* 60 */
  58             unsigned long initrd_start;         /* 64 */
  59             unsigned long initrd_size;          /* 68 */
  60             unsigned long rd_start;             /* 72 */
  61             unsigned long system_rev;           /* 76 */
  62             unsigned long system_serial_low;    /* 80 */
  63             unsigned long system_serial_high;   /* 84 */
  64             unsigned long mem_fclk_21285;       /* 88 */
  65         } s;
  66         char unused[256];
  67     } u1;
  68     union {
  69         char paths[8][128];
  70         struct {
  71             unsigned long magic;
  72             char n[1024 - sizeof(unsigned long)];
  73         } s;
  74     } u2;
  75     char commandline[COMMAND_LINE_SIZE];
  76 };
  77
  78
  79 /*
  80  * The new way of passing information: a list of tagged entries
  81  */
  82
  83 /* The list ends with an ATAG_NONE node. */
  84 #define ATAG_NONE       0x00000000
  85
  86 struct tag_header {
  87         u32 size;
  88         u32 tag;
  89 };
  90
  91 /* The list must start with an ATAG_CORE node */
  92 #define ATAG_CORE       0x54410001
  93
  94 struct tag_core {
  95         u32 flags;              /* bit 0 = read-only */
  96         u32 pagesize;
  97         u32 rootdev;
  98 };
  99
 100 /* it is allowed to have multiple ATAG_MEM nodes */
 101 #define ATAG_MEM        0x54410002
 102
 103 struct tag_mem32 {
 104         u32     size;
 105         u32     start;  /* physical start address */
 106 };
 107
 108 /* VGA text type displays */
 109 #define ATAG_VIDEOTEXT  0x54410003
 110
 111 struct tag_videotext {
 112         u8              x;
 113         u8              y;
 114         u16             video_page;
 115         u8              video_mode;
 116         u8              video_cols;
 117         u16             video_ega_bx;
 118         u8              video_lines;
 119         u8              video_isvga;
 120         u16             video_points;
 121 };
 122
 123 /* describes how the ramdisk will be used in kernel */
 124 #define ATAG_RAMDISK    0x54410004
 125
 126 struct tag_ramdisk {
 127         u32 flags;      /* bit 0 = load, bit 1 = prompt */
 128         u32 size;       /* decompressed ramdisk size in _kilo_ bytes */
 129         u32 start;      /* starting block of floppy-based RAM disk image */
 130 };
 131
 132 /* describes where the compressed ramdisk image lives (virtual address) */
 133 /*
 134  * this one accidentally used virtual addresses - as such,
 135  * its depreciated.
 136  */
 137 #define ATAG_INITRD     0x54410005
 138
 139 /* describes where the compressed ramdisk image lives (physical address) */
 140 #define ATAG_INITRD2    0x54420005
 141
 142 struct tag_initrd {
 143         u32 start;      /* physical start address */
 144         u32 size;       /* size of compressed ramdisk image in bytes */
 145 };
 146
 147 /* board serial number. "64 bits should be enough for everybody" */
 148 #define ATAG_SERIAL     0x54410006
 149
 150 struct tag_serialnr {
 151         u32 low;
 152         u32 high;
 153 };
 154
 155 /* board revision */
 156 #define ATAG_REVISION   0x54410007
 157
 158 struct tag_revision {
 159         u32 rev;
 160 };
 161
 162 /* initial values for vesafb-type framebuffers. see struct screen_info
 163  * in include/linux/tty.h
 164  */
 165 #define ATAG_VIDEOLFB   0x54410008
 166
 167 struct tag_videolfb {
 168         u16             lfb_width;
 169         u16             lfb_height;
 170         u16             lfb_depth;
 171         u16             lfb_linelength;
 172         u32             lfb_base;
 173         u32             lfb_size;
 174         u8              red_size;
 175         u8              red_pos;
 176         u8              green_size;
 177         u8              green_pos;
 178         u8              blue_size;
 179         u8              blue_pos;
 180         u8              rsvd_size;
 181         u8              rsvd_pos;
 182 };
 183
 184 /* command line: \0 terminated string */
 185 #define ATAG_CMDLINE    0x54410009
 186
 187 struct tag_cmdline {
 188         char    cmdline[1];     /* this is the minimum size */
 189 };
 190
 191 /* acorn RiscPC specific information */
 192 #define ATAG_ACORN      0x41000101
 193
 194 struct tag_acorn {
 195         u32 memc_control_reg;
 196         u32 vram_pages;
 197         u8 sounddefault;
 198         u8 adfsdrives;
 199 };
 200
 201 /* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
 202 #define ATAG_MEMCLK     0x41000402
 203
 204 struct tag_memclk {
 205         u32 fmemclk;
 206 };
 207
 208 struct tag {
 209         struct tag_header hdr;
 210         union {
 211                 struct tag_core         core;
 212                 struct tag_mem32        mem;
 213                 struct tag_videotext    videotext;
 214                 struct tag_ramdisk      ramdisk;
 215                 struct tag_initrd       initrd;
 216                 struct tag_serialnr     serialnr;
 217                 struct tag_revision     revision;
 218                 struct tag_videolfb     videolfb;
 219                 struct tag_cmdline      cmdline;
 220
 221                 /*
 222                  * Acorn specific
 223                  */
 224                 struct tag_acorn        acorn;
 225
 226                 /*
 227                  * DC21285 specific
 228                  */
 229                 struct tag_memclk       memclk;
 230         } u;
 231 };
 232
 233 struct tagtable {
 234         u32 tag;
 235         int (*parse)(const struct tag *);
 236 };
 237
 238 #define __tag __attribute__((unused, __section__(".taglist")))
 239 #define __tagtable(tag, fn) \
 240 static struct tagtable __tagtable_##fn __tag = { tag, fn }
 241
 242 #define tag_member_present(tag,member)                          \
 243         ((unsigned long)(&((struct tag *)0L)->member + 1)       \
 244                 <= (tag)->hdr.size * 4)
 245
 246 #define tag_next(t)     ((struct tag *)((u32 *)(t) + (t)->hdr.size))
 247 #define tag_size(type)  ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
 248
 249 #define for_each_tag(t,base)            \
 250         for (t = base; t->hdr.size; t = tag_next(t))
 251
 252 /*
 253  * Memory map description
 254  */
 255 #define NR_BANKS 8
 256
 257 struct meminfo {
 258         int nr_banks;
 259         unsigned long end;
 260         struct {
 261                 unsigned long start;
 262                 unsigned long size;
 263                 int           node;
 264         } bank[NR_BANKS];
 265 };
 266
 267 extern struct meminfo meminfo;
 268
 269 #endif