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 #include <common.h> 28 #include <command.h> 29 #include <image.h> 30 #include <u-boot/zlib.h> 31 #include <asm/byteorder.h> 32 #include <libfdt.h> 33 #include <fdt_support.h> 34 #include <asm/bootm.h> 35 #include <linux/compiler.h> 36 37 DECLARE_GLOBAL_DATA_PTR; 38 39 static struct tag *params; 40 41 static ulong get_sp(void) 42 { 43 ulong ret; 44 45 asm("mov %0, sp" : "=r"(ret) : ); 46 return ret; 47 } 48 49 void arch_lmb_reserve(struct lmb *lmb) 50 { 51 ulong sp; 52 53 /* 54 * Booting a (Linux) kernel image 55 * 56 * Allocate space for command line and board info - the 57 * address should be as high as possible within the reach of 58 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused 59 * memory, which means far enough below the current stack 60 * pointer. 61 */ 62 sp = get_sp(); 63 debug("## Current stack ends at 0x%08lx ", sp); 64 65 /* adjust sp by 4K to be safe */ 66 sp -= 4096; 67 lmb_reserve(lmb, sp, 68 gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp); 69 } 70 71 /** 72 * announce_and_cleanup() - Print message and prepare for kernel boot 73 * 74 * @fake: non-zero to do everything except actually boot 75 */ 76 static void announce_and_cleanup(int fake) 77 { 78 printf("\nStarting kernel ...%s\n\n", fake ? 79 "(fake run for tracing)" : ""); 80 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 81 #ifdef CONFIG_BOOTSTAGE_FDT 82 if (flag == BOOTM_STATE_OS_FAKE_GO) 83 bootstage_fdt_add_report(); 84 #endif 85 #ifdef CONFIG_BOOTSTAGE_REPORT 86 bootstage_report(); 87 #endif 88 89 #ifdef CONFIG_USB_DEVICE 90 udc_disconnect(); 91 #endif 92 cleanup_before_linux(); 93 } 94 95 static void setup_start_tag (bd_t *bd) 96 { 97 params = (struct tag *)bd->bi_boot_params; 98 99 params->hdr.tag = ATAG_CORE; 100 params->hdr.size = tag_size (tag_core); 101 102 params->u.core.flags = 0; 103 params->u.core.pagesize = 0; 104 params->u.core.rootdev = 0; 105 106 params = tag_next (params); 107 } 108 109 static void setup_memory_tags(bd_t *bd) 110 { 111 int i; 112 113 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 114 params->hdr.tag = ATAG_MEM; 115 params->hdr.size = tag_size (tag_mem32); 116 117 params->u.mem.start = bd->bi_dram[i].start; 118 params->u.mem.size = bd->bi_dram[i].size; 119 120 params = tag_next (params); 121 } 122 } 123 124 static void setup_commandline_tag(bd_t *bd, char *commandline) 125 { 126 char *p; 127 128 if (!commandline) 129 return; 130 131 /* eat leading white space */ 132 for (p = commandline; *p == ' '; p++); 133 134 /* skip non-existent command lines so the kernel will still 135 * use its default command line. 136 */ 137 if (*p == '\0') 138 return; 139 140 params->hdr.tag = ATAG_CMDLINE; 141 params->hdr.size = 142 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2; 143 144 strcpy (params->u.cmdline.cmdline, p); 145 146 params = tag_next (params); 147 } 148 149 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end) 150 { 151 /* an ATAG_INITRD node tells the kernel where the compressed 152 * ramdisk can be found. ATAG_RDIMG is a better name, actually. 153 */ 154 params->hdr.tag = ATAG_INITRD2; 155 params->hdr.size = tag_size (tag_initrd); 156 157 params->u.initrd.start = initrd_start; 158 params->u.initrd.size = initrd_end - initrd_start; 159 160 params = tag_next (params); 161 } 162 163 static void setup_serial_tag(struct tag **tmp) 164 { 165 struct tag *params = *tmp; 166 struct tag_serialnr serialnr; 167 168 get_board_serial(&serialnr); 169 params->hdr.tag = ATAG_SERIAL; 170 params->hdr.size = tag_size (tag_serialnr); 171 params->u.serialnr.low = serialnr.low; 172 params->u.serialnr.high= serialnr.high; 173 params = tag_next (params); 174 *tmp = params; 175 } 176 177 static void setup_revision_tag(struct tag **in_params) 178 { 179 u32 rev = 0; 180 181 rev = get_board_rev(); 182 params->hdr.tag = ATAG_REVISION; 183 params->hdr.size = tag_size (tag_revision); 184 params->u.revision.rev = rev; 185 params = tag_next (params); 186 } 187 188 static void setup_end_tag(bd_t *bd) 189 { 190 params->hdr.tag = ATAG_NONE; 191 params->hdr.size = 0; 192 } 193 194 __weak void setup_board_tags(struct tag **in_params) {} 195 196 /* Subcommand: PREP */ 197 static void boot_prep_linux(bootm_headers_t *images) 198 { 199 char *commandline = getenv("bootargs"); 200 201 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 202 #ifdef CONFIG_OF_LIBFDT 203 debug("using: FDT\n"); 204 if (image_setup_linux(images)) { 205 printf("FDT creation failed! hanging..."); 206 hang(); 207 } 208 #endif 209 } else if (BOOTM_ENABLE_TAGS) { 210 debug("using: ATAGS\n"); 211 setup_start_tag(gd->bd); 212 if (BOOTM_ENABLE_SERIAL_TAG) 213 setup_serial_tag(¶ms); 214 if (BOOTM_ENABLE_CMDLINE_TAG) 215 setup_commandline_tag(gd->bd, commandline); 216 if (BOOTM_ENABLE_REVISION_TAG) 217 setup_revision_tag(¶ms); 218 if (BOOTM_ENABLE_MEMORY_TAGS) 219 setup_memory_tags(gd->bd); 220 if (BOOTM_ENABLE_INITRD_TAG) { 221 if (images->rd_start && images->rd_end) { 222 setup_initrd_tag(gd->bd, images->rd_start, 223 images->rd_end); 224 } 225 } 226 setup_board_tags(¶ms); 227 setup_end_tag(gd->bd); 228 } else { 229 printf("FDT and ATAGS support not compiled in - hanging\n"); 230 hang(); 231 } 232 } 233 234 /* Subcommand: GO */ 235 static void boot_jump_linux(bootm_headers_t *images, int flag) 236 { 237 unsigned long machid = gd->bd->bi_arch_number; 238 char *s; 239 void (*kernel_entry)(int zero, int arch, uint params); 240 unsigned long r2; 241 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 242 243 kernel_entry = (void (*)(int, int, uint))images->ep; 244 245 s = getenv("machid"); 246 if (s) { 247 strict_strtoul(s, 16, &machid); 248 printf("Using machid 0x%lx from environment\n", machid); 249 } 250 251 debug("## Transferring control to Linux (at address %08lx)" \ 252 "...\n", (ulong) kernel_entry); 253 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 254 announce_and_cleanup(fake); 255 256 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) 257 r2 = (unsigned long)images->ft_addr; 258 else 259 r2 = gd->bd->bi_boot_params; 260 261 if (!fake) 262 kernel_entry(0, machid, r2); 263 } 264 265 /* Main Entry point for arm bootm implementation 266 * 267 * Modeled after the powerpc implementation 268 * DIFFERENCE: Instead of calling prep and go at the end 269 * they are called if subcommand is equal 0. 270 */ 271 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) 272 { 273 /* No need for those on ARM */ 274 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE) 275 return -1; 276 277 if (flag & BOOTM_STATE_OS_PREP) { 278 boot_prep_linux(images); 279 return 0; 280 } 281 282 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 283 boot_jump_linux(images, flag); 284 return 0; 285 } 286 287 boot_prep_linux(images); 288 boot_jump_linux(images, flag); 289 return 0; 290 } 291 292 #ifdef CONFIG_CMD_BOOTZ 293 294 struct zimage_header { 295 uint32_t code[9]; 296 uint32_t zi_magic; 297 uint32_t zi_start; 298 uint32_t zi_end; 299 }; 300 301 #define LINUX_ARM_ZIMAGE_MAGIC 0x016f2818 302 303 int bootz_setup(ulong image, ulong *start, ulong *end) 304 { 305 struct zimage_header *zi; 306 307 zi = (struct zimage_header *)map_sysmem(image, 0); 308 if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) { 309 puts("Bad Linux ARM zImage magic!\n"); 310 return 1; 311 } 312 313 *start = zi->zi_start; 314 *end = zi->zi_end; 315 316 printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start, 317 *end); 318 319 return 0; 320 } 321 322 #endif /* CONFIG_CMD_BOOTZ */ 323