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 * it's deprecated. 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 270 271 /* 272 * Board specified tags 273 */ 274 void setup_board_tags(struct tag **in_params); 275