1 /* Copyright (C) 2011 2 * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de> 3 * - Added prep subcommand support 4 * - Reorganized source - modeled after powerpc version 5 * 6 * (C) Copyright 2002 7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 8 * Marius Groeger <mgroeger@sysgo.de> 9 * 10 * Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 */ 27 28 #include <common.h> 29 #include <command.h> 30 #include <image.h> 31 #include <u-boot/zlib.h> 32 #include <asm/byteorder.h> 33 #include <fdt.h> 34 #include <libfdt.h> 35 #include <fdt_support.h> 36 #include <asm/bootm.h> 37 38 DECLARE_GLOBAL_DATA_PTR; 39 40 #if defined(CONFIG_SETUP_MEMORY_TAGS) || \ 41 defined(CONFIG_CMDLINE_TAG) || \ 42 defined(CONFIG_INITRD_TAG) || \ 43 defined(CONFIG_SERIAL_TAG) || \ 44 defined(CONFIG_REVISION_TAG) 45 static struct tag *params; 46 #endif 47 48 static ulong get_sp(void) 49 { 50 ulong ret; 51 52 asm("mov %0, sp" : "=r"(ret) : ); 53 return ret; 54 } 55 56 void arch_lmb_reserve(struct lmb *lmb) 57 { 58 ulong sp; 59 60 /* 61 * Booting a (Linux) kernel image 62 * 63 * Allocate space for command line and board info - the 64 * address should be as high as possible within the reach of 65 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused 66 * memory, which means far enough below the current stack 67 * pointer. 68 */ 69 sp = get_sp(); 70 debug("## Current stack ends at 0x%08lx ", sp); 71 72 /* adjust sp by 1K to be safe */ 73 sp -= 1024; 74 lmb_reserve(lmb, sp, 75 gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp); 76 } 77 78 #ifdef CONFIG_OF_LIBFDT 79 static int fixup_memory_node(void *blob) 80 { 81 bd_t *bd = gd->bd; 82 int bank; 83 u64 start[CONFIG_NR_DRAM_BANKS]; 84 u64 size[CONFIG_NR_DRAM_BANKS]; 85 86 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) { 87 start[bank] = bd->bi_dram[bank].start; 88 size[bank] = bd->bi_dram[bank].size; 89 } 90 91 return fdt_fixup_memory_banks(blob, start, size, CONFIG_NR_DRAM_BANKS); 92 } 93 #endif 94 95 static void announce_and_cleanup(void) 96 { 97 printf("\nStarting kernel ...\n\n"); 98 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 99 #ifdef CONFIG_BOOTSTAGE_REPORT 100 bootstage_report(); 101 #endif 102 103 #ifdef CONFIG_USB_DEVICE 104 udc_disconnect(); 105 #endif 106 cleanup_before_linux(); 107 } 108 109 #if defined(CONFIG_SETUP_MEMORY_TAGS) || \ 110 defined(CONFIG_CMDLINE_TAG) || \ 111 defined(CONFIG_INITRD_TAG) || \ 112 defined(CONFIG_SERIAL_TAG) || \ 113 defined(CONFIG_REVISION_TAG) 114 static void setup_start_tag (bd_t *bd) 115 { 116 params = (struct tag *)bd->bi_boot_params; 117 118 params->hdr.tag = ATAG_CORE; 119 params->hdr.size = tag_size (tag_core); 120 121 params->u.core.flags = 0; 122 params->u.core.pagesize = 0; 123 params->u.core.rootdev = 0; 124 125 params = tag_next (params); 126 } 127 #endif 128 129 #ifdef CONFIG_SETUP_MEMORY_TAGS 130 static void setup_memory_tags(bd_t *bd) 131 { 132 int i; 133 134 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 135 params->hdr.tag = ATAG_MEM; 136 params->hdr.size = tag_size (tag_mem32); 137 138 params->u.mem.start = bd->bi_dram[i].start; 139 params->u.mem.size = bd->bi_dram[i].size; 140 141 params = tag_next (params); 142 } 143 } 144 #endif 145 146 #ifdef CONFIG_CMDLINE_TAG 147 static void setup_commandline_tag(bd_t *bd, char *commandline) 148 { 149 char *p; 150 151 if (!commandline) 152 return; 153 154 /* eat leading white space */ 155 for (p = commandline; *p == ' '; p++); 156 157 /* skip non-existent command lines so the kernel will still 158 * use its default command line. 159 */ 160 if (*p == '\0') 161 return; 162 163 params->hdr.tag = ATAG_CMDLINE; 164 params->hdr.size = 165 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2; 166 167 strcpy (params->u.cmdline.cmdline, p); 168 169 params = tag_next (params); 170 } 171 #endif 172 173 #ifdef CONFIG_INITRD_TAG 174 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end) 175 { 176 /* an ATAG_INITRD node tells the kernel where the compressed 177 * ramdisk can be found. ATAG_RDIMG is a better name, actually. 178 */ 179 params->hdr.tag = ATAG_INITRD2; 180 params->hdr.size = tag_size (tag_initrd); 181 182 params->u.initrd.start = initrd_start; 183 params->u.initrd.size = initrd_end - initrd_start; 184 185 params = tag_next (params); 186 } 187 #endif 188 189 #ifdef CONFIG_SERIAL_TAG 190 void setup_serial_tag(struct tag **tmp) 191 { 192 struct tag *params = *tmp; 193 struct tag_serialnr serialnr; 194 void get_board_serial(struct tag_serialnr *serialnr); 195 196 get_board_serial(&serialnr); 197 params->hdr.tag = ATAG_SERIAL; 198 params->hdr.size = tag_size (tag_serialnr); 199 params->u.serialnr.low = serialnr.low; 200 params->u.serialnr.high= serialnr.high; 201 params = tag_next (params); 202 *tmp = params; 203 } 204 #endif 205 206 #ifdef CONFIG_REVISION_TAG 207 void setup_revision_tag(struct tag **in_params) 208 { 209 u32 rev = 0; 210 u32 get_board_rev(void); 211 212 rev = get_board_rev(); 213 params->hdr.tag = ATAG_REVISION; 214 params->hdr.size = tag_size (tag_revision); 215 params->u.revision.rev = rev; 216 params = tag_next (params); 217 } 218 #endif 219 220 #if defined(CONFIG_SETUP_MEMORY_TAGS) || \ 221 defined(CONFIG_CMDLINE_TAG) || \ 222 defined(CONFIG_INITRD_TAG) || \ 223 defined(CONFIG_SERIAL_TAG) || \ 224 defined(CONFIG_REVISION_TAG) 225 static void setup_end_tag(bd_t *bd) 226 { 227 params->hdr.tag = ATAG_NONE; 228 params->hdr.size = 0; 229 } 230 #endif 231 232 #ifdef CONFIG_OF_LIBFDT 233 static int create_fdt(bootm_headers_t *images) 234 { 235 ulong of_size = images->ft_len; 236 char **of_flat_tree = &images->ft_addr; 237 ulong *initrd_start = &images->initrd_start; 238 ulong *initrd_end = &images->initrd_end; 239 struct lmb *lmb = &images->lmb; 240 ulong rd_len; 241 int ret; 242 243 debug("using: FDT\n"); 244 245 boot_fdt_add_mem_rsv_regions(lmb, *of_flat_tree); 246 247 rd_len = images->rd_end - images->rd_start; 248 ret = boot_ramdisk_high(lmb, images->rd_start, rd_len, 249 initrd_start, initrd_end); 250 if (ret) 251 return ret; 252 253 ret = boot_relocate_fdt(lmb, of_flat_tree, &of_size); 254 if (ret) 255 return ret; 256 257 fdt_chosen(*of_flat_tree, 1); 258 fixup_memory_node(*of_flat_tree); 259 fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1); 260 261 return 0; 262 } 263 #endif 264 265 /* Subcommand: PREP */ 266 static void boot_prep_linux(bootm_headers_t *images) 267 { 268 #ifdef CONFIG_CMDLINE_TAG 269 char *commandline = getenv("bootargs"); 270 #endif 271 272 #ifdef CONFIG_OF_LIBFDT 273 if (images->ft_len) { 274 debug("using: FDT\n"); 275 if (create_fdt(images)) { 276 printf("FDT creation failed! hanging..."); 277 hang(); 278 } 279 } else 280 #endif 281 { 282 #if defined(CONFIG_SETUP_MEMORY_TAGS) || \ 283 defined(CONFIG_CMDLINE_TAG) || \ 284 defined(CONFIG_INITRD_TAG) || \ 285 defined(CONFIG_SERIAL_TAG) || \ 286 defined(CONFIG_REVISION_TAG) 287 debug("using: ATAGS\n"); 288 setup_start_tag(gd->bd); 289 #ifdef CONFIG_SERIAL_TAG 290 setup_serial_tag(¶ms); 291 #endif 292 #ifdef CONFIG_CMDLINE_TAG 293 setup_commandline_tag(gd->bd, commandline); 294 #endif 295 #ifdef CONFIG_REVISION_TAG 296 setup_revision_tag(¶ms); 297 #endif 298 #ifdef CONFIG_SETUP_MEMORY_TAGS 299 setup_memory_tags(gd->bd); 300 #endif 301 #ifdef CONFIG_INITRD_TAG 302 if (images->rd_start && images->rd_end) 303 setup_initrd_tag(gd->bd, images->rd_start, 304 images->rd_end); 305 #endif 306 setup_end_tag(gd->bd); 307 #else /* all tags */ 308 printf("FDT and ATAGS support not compiled in - hanging\n"); 309 hang(); 310 #endif /* all tags */ 311 } 312 } 313 314 /* Subcommand: GO */ 315 static void boot_jump_linux(bootm_headers_t *images) 316 { 317 unsigned long machid = gd->bd->bi_arch_number; 318 char *s; 319 void (*kernel_entry)(int zero, int arch, uint params); 320 321 kernel_entry = (void (*)(int, int, uint))images->ep; 322 323 s = getenv("machid"); 324 if (s) { 325 strict_strtoul(s, 16, &machid); 326 printf("Using machid 0x%lx from environment\n", machid); 327 } 328 329 debug("## Transferring control to Linux (at address %08lx)" \ 330 "...\n", (ulong) kernel_entry); 331 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 332 announce_and_cleanup(); 333 kernel_entry(0, machid, gd->bd->bi_boot_params); 334 } 335 336 /* Main Entry point for arm bootm implementation 337 * 338 * Modeled after the powerpc implementation 339 * DIFFERENCE: Instead of calling prep and go at the end 340 * they are called if subcommand is equal 0. 341 */ 342 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) 343 { 344 /* No need for those on ARM */ 345 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE) 346 return -1; 347 348 if (flag & BOOTM_STATE_OS_PREP) { 349 boot_prep_linux(images); 350 return 0; 351 } 352 353 if (flag & BOOTM_STATE_OS_GO) { 354 boot_jump_linux(images); 355 return 0; 356 } 357 358 boot_prep_linux(images); 359 boot_jump_linux(images); 360 return 0; 361 } 362