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 * SPDX-License-Identifier: GPL-2.0+ 13 */ 14 15 #include <common.h> 16 #include <command.h> 17 #include <image.h> 18 #include <u-boot/zlib.h> 19 #include <asm/byteorder.h> 20 #include <libfdt.h> 21 #include <fdt_support.h> 22 #include <asm/bootm.h> 23 #include <linux/compiler.h> 24 25 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) 26 #include <asm/armv7.h> 27 #endif 28 29 DECLARE_GLOBAL_DATA_PTR; 30 31 static struct tag *params; 32 33 static ulong get_sp(void) 34 { 35 ulong ret; 36 37 asm("mov %0, sp" : "=r"(ret) : ); 38 return ret; 39 } 40 41 void arch_lmb_reserve(struct lmb *lmb) 42 { 43 ulong sp; 44 45 /* 46 * Booting a (Linux) kernel image 47 * 48 * Allocate space for command line and board info - the 49 * address should be as high as possible within the reach of 50 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused 51 * memory, which means far enough below the current stack 52 * pointer. 53 */ 54 sp = get_sp(); 55 debug("## Current stack ends at 0x%08lx ", sp); 56 57 /* adjust sp by 4K to be safe */ 58 sp -= 4096; 59 lmb_reserve(lmb, sp, 60 gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp); 61 } 62 63 /** 64 * announce_and_cleanup() - Print message and prepare for kernel boot 65 * 66 * @fake: non-zero to do everything except actually boot 67 */ 68 static void announce_and_cleanup(int fake) 69 { 70 printf("\nStarting kernel ...%s\n\n", fake ? 71 "(fake run for tracing)" : ""); 72 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); 73 #ifdef CONFIG_BOOTSTAGE_FDT 74 if (flag == BOOTM_STATE_OS_FAKE_GO) 75 bootstage_fdt_add_report(); 76 #endif 77 #ifdef CONFIG_BOOTSTAGE_REPORT 78 bootstage_report(); 79 #endif 80 81 #ifdef CONFIG_USB_DEVICE 82 udc_disconnect(); 83 #endif 84 cleanup_before_linux(); 85 } 86 87 static void setup_start_tag (bd_t *bd) 88 { 89 params = (struct tag *)bd->bi_boot_params; 90 91 params->hdr.tag = ATAG_CORE; 92 params->hdr.size = tag_size (tag_core); 93 94 params->u.core.flags = 0; 95 params->u.core.pagesize = 0; 96 params->u.core.rootdev = 0; 97 98 params = tag_next (params); 99 } 100 101 static void setup_memory_tags(bd_t *bd) 102 { 103 int i; 104 105 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { 106 params->hdr.tag = ATAG_MEM; 107 params->hdr.size = tag_size (tag_mem32); 108 109 params->u.mem.start = bd->bi_dram[i].start; 110 params->u.mem.size = bd->bi_dram[i].size; 111 112 params = tag_next (params); 113 } 114 } 115 116 static void setup_commandline_tag(bd_t *bd, char *commandline) 117 { 118 char *p; 119 120 if (!commandline) 121 return; 122 123 /* eat leading white space */ 124 for (p = commandline; *p == ' '; p++); 125 126 /* skip non-existent command lines so the kernel will still 127 * use its default command line. 128 */ 129 if (*p == '\0') 130 return; 131 132 params->hdr.tag = ATAG_CMDLINE; 133 params->hdr.size = 134 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2; 135 136 strcpy (params->u.cmdline.cmdline, p); 137 138 params = tag_next (params); 139 } 140 141 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end) 142 { 143 /* an ATAG_INITRD node tells the kernel where the compressed 144 * ramdisk can be found. ATAG_RDIMG is a better name, actually. 145 */ 146 params->hdr.tag = ATAG_INITRD2; 147 params->hdr.size = tag_size (tag_initrd); 148 149 params->u.initrd.start = initrd_start; 150 params->u.initrd.size = initrd_end - initrd_start; 151 152 params = tag_next (params); 153 } 154 155 static void setup_serial_tag(struct tag **tmp) 156 { 157 struct tag *params = *tmp; 158 struct tag_serialnr serialnr; 159 160 get_board_serial(&serialnr); 161 params->hdr.tag = ATAG_SERIAL; 162 params->hdr.size = tag_size (tag_serialnr); 163 params->u.serialnr.low = serialnr.low; 164 params->u.serialnr.high= serialnr.high; 165 params = tag_next (params); 166 *tmp = params; 167 } 168 169 static void setup_revision_tag(struct tag **in_params) 170 { 171 u32 rev = 0; 172 173 rev = get_board_rev(); 174 params->hdr.tag = ATAG_REVISION; 175 params->hdr.size = tag_size (tag_revision); 176 params->u.revision.rev = rev; 177 params = tag_next (params); 178 } 179 180 static void setup_end_tag(bd_t *bd) 181 { 182 params->hdr.tag = ATAG_NONE; 183 params->hdr.size = 0; 184 } 185 186 __weak void setup_board_tags(struct tag **in_params) {} 187 188 static void do_nonsec_virt_switch(void) 189 { 190 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT) 191 if (armv7_switch_nonsec() == 0) 192 #ifdef CONFIG_ARMV7_VIRT 193 if (armv7_switch_hyp() == 0) 194 debug("entered HYP mode\n"); 195 #else 196 debug("entered non-secure state\n"); 197 #endif 198 #endif 199 } 200 201 /* Subcommand: PREP */ 202 static void boot_prep_linux(bootm_headers_t *images) 203 { 204 char *commandline = getenv("bootargs"); 205 206 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { 207 #ifdef CONFIG_OF_LIBFDT 208 debug("using: FDT\n"); 209 if (image_setup_linux(images)) { 210 printf("FDT creation failed! hanging..."); 211 hang(); 212 } 213 #endif 214 } else if (BOOTM_ENABLE_TAGS) { 215 debug("using: ATAGS\n"); 216 setup_start_tag(gd->bd); 217 if (BOOTM_ENABLE_SERIAL_TAG) 218 setup_serial_tag(¶ms); 219 if (BOOTM_ENABLE_CMDLINE_TAG) 220 setup_commandline_tag(gd->bd, commandline); 221 if (BOOTM_ENABLE_REVISION_TAG) 222 setup_revision_tag(¶ms); 223 if (BOOTM_ENABLE_MEMORY_TAGS) 224 setup_memory_tags(gd->bd); 225 if (BOOTM_ENABLE_INITRD_TAG) { 226 if (images->rd_start && images->rd_end) { 227 setup_initrd_tag(gd->bd, images->rd_start, 228 images->rd_end); 229 } 230 } 231 setup_board_tags(¶ms); 232 setup_end_tag(gd->bd); 233 } else { 234 printf("FDT and ATAGS support not compiled in - hanging\n"); 235 hang(); 236 } 237 do_nonsec_virt_switch(); 238 } 239 240 /* Subcommand: GO */ 241 static void boot_jump_linux(bootm_headers_t *images, int flag) 242 { 243 unsigned long machid = gd->bd->bi_arch_number; 244 char *s; 245 void (*kernel_entry)(int zero, int arch, uint params); 246 unsigned long r2; 247 int fake = (flag & BOOTM_STATE_OS_FAKE_GO); 248 249 kernel_entry = (void (*)(int, int, uint))images->ep; 250 251 s = getenv("machid"); 252 if (s) { 253 strict_strtoul(s, 16, &machid); 254 printf("Using machid 0x%lx from environment\n", machid); 255 } 256 257 debug("## Transferring control to Linux (at address %08lx)" \ 258 "...\n", (ulong) kernel_entry); 259 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 260 announce_and_cleanup(fake); 261 262 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) 263 r2 = (unsigned long)images->ft_addr; 264 else 265 r2 = gd->bd->bi_boot_params; 266 267 if (!fake) 268 kernel_entry(0, machid, r2); 269 } 270 271 /* Main Entry point for arm bootm implementation 272 * 273 * Modeled after the powerpc implementation 274 * DIFFERENCE: Instead of calling prep and go at the end 275 * they are called if subcommand is equal 0. 276 */ 277 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) 278 { 279 /* No need for those on ARM */ 280 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE) 281 return -1; 282 283 if (flag & BOOTM_STATE_OS_PREP) { 284 boot_prep_linux(images); 285 return 0; 286 } 287 288 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { 289 boot_jump_linux(images, flag); 290 return 0; 291 } 292 293 boot_prep_linux(images); 294 boot_jump_linux(images, flag); 295 return 0; 296 } 297 298 #ifdef CONFIG_CMD_BOOTZ 299 300 struct zimage_header { 301 uint32_t code[9]; 302 uint32_t zi_magic; 303 uint32_t zi_start; 304 uint32_t zi_end; 305 }; 306 307 #define LINUX_ARM_ZIMAGE_MAGIC 0x016f2818 308 309 int bootz_setup(ulong image, ulong *start, ulong *end) 310 { 311 struct zimage_header *zi; 312 313 zi = (struct zimage_header *)map_sysmem(image, 0); 314 if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) { 315 puts("Bad Linux ARM zImage magic!\n"); 316 return 1; 317 } 318 319 *start = zi->zi_start; 320 *end = zi->zi_end; 321 322 printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start, 323 *end); 324 325 return 0; 326 } 327 328 #endif /* CONFIG_CMD_BOOTZ */ 329