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 */ 36struct 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 86struct 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 94struct 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 103struct tag_mem32 { 104 u32 size; 105 u32 start; /* physical start address */ 106}; 107 108/* VGA text type displays */ 109#define ATAG_VIDEOTEXT 0x54410003 110 111struct 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 126struct 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 142struct 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 150struct tag_serialnr { 151 u32 low; 152 u32 high; 153}; 154 155/* board revision */ 156#define ATAG_REVISION 0x54410007 157 158struct 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 167struct 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 187struct tag_cmdline { 188 char cmdline[1]; /* this is the minimum size */ 189}; 190 191/* acorn RiscPC specific information */ 192#define ATAG_ACORN 0x41000101 193 194struct 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 204struct tag_memclk { 205 u32 fmemclk; 206}; 207 208struct 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 233struct tagtable { 234 u32 tag; 235 int (*parse)(const struct tag *); 236}; 237 238#define __tag __attribute__((unused)) __section(".taglist") 239#define __tagtable(tag, fn) \ 240static 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 257struct 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 267extern struct meminfo meminfo; 268 269#endif 270 271/* 272 * Board specified tags 273 */ 274void setup_board_tags(struct tag **in_params); 275