arch/arm/lib/bootm.c

   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         bootstage_fdt_add_report();
  75 #endif
  76 #ifdef CONFIG_BOOTSTAGE_REPORT
  77         bootstage_report();
  78 #endif
  79
  80 #ifdef CONFIG_USB_DEVICE
  81         udc_disconnect();
  82 #endif
  83         cleanup_before_linux();
  84 }
  85
  86 static void setup_start_tag (bd_t *bd)
  87 {
  88         params = (struct tag *)bd->bi_boot_params;
  89
  90         params->hdr.tag = ATAG_CORE;
  91         params->hdr.size = tag_size (tag_core);
  92
  93         params->u.core.flags = 0;
  94         params->u.core.pagesize = 0;
  95         params->u.core.rootdev = 0;
  96
  97         params = tag_next (params);
  98 }
  99
 100 static void setup_memory_tags(bd_t *bd)
 101 {
 102         int i;
 103
 104         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 105                 params->hdr.tag = ATAG_MEM;
 106                 params->hdr.size = tag_size (tag_mem32);
 107
 108                 params->u.mem.start = bd->bi_dram[i].start;
 109                 params->u.mem.size = bd->bi_dram[i].size;
 110
 111                 params = tag_next (params);
 112         }
 113 }
 114
 115 static void setup_commandline_tag(bd_t *bd, char *commandline)
 116 {
 117         char *p;
 118
 119         if (!commandline)
 120                 return;
 121
 122         /* eat leading white space */
 123         for (p = commandline; *p == ' '; p++);
 124
 125         /* skip non-existent command lines so the kernel will still
 126          * use its default command line.
 127          */
 128         if (*p == '\0')
 129                 return;
 130
 131         params->hdr.tag = ATAG_CMDLINE;
 132         params->hdr.size =
 133                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 134
 135         strcpy (params->u.cmdline.cmdline, p);
 136
 137         params = tag_next (params);
 138 }
 139
 140 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
 141 {
 142         /* an ATAG_INITRD node tells the kernel where the compressed
 143          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 144          */
 145         params->hdr.tag = ATAG_INITRD2;
 146         params->hdr.size = tag_size (tag_initrd);
 147
 148         params->u.initrd.start = initrd_start;
 149         params->u.initrd.size = initrd_end - initrd_start;
 150
 151         params = tag_next (params);
 152 }
 153
 154 static void setup_serial_tag(struct tag **tmp)
 155 {
 156         struct tag *params = *tmp;
 157         struct tag_serialnr serialnr;
 158
 159         get_board_serial(&serialnr);
 160         params->hdr.tag = ATAG_SERIAL;
 161         params->hdr.size = tag_size (tag_serialnr);
 162         params->u.serialnr.low = serialnr.low;
 163         params->u.serialnr.high= serialnr.high;
 164         params = tag_next (params);
 165         *tmp = params;
 166 }
 167
 168 static void setup_revision_tag(struct tag **in_params)
 169 {
 170         u32 rev = 0;
 171
 172         rev = get_board_rev();
 173         params->hdr.tag = ATAG_REVISION;
 174         params->hdr.size = tag_size (tag_revision);
 175         params->u.revision.rev = rev;
 176         params = tag_next (params);
 177 }
 178
 179 static void setup_end_tag(bd_t *bd)
 180 {
 181         params->hdr.tag = ATAG_NONE;
 182         params->hdr.size = 0;
 183 }
 184
 185 __weak void setup_board_tags(struct tag **in_params) {}
 186
 187 static void do_nonsec_virt_switch(void)
 188 {
 189 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
 190         if (armv7_switch_nonsec() == 0)
 191 #ifdef CONFIG_ARMV7_VIRT
 192                 if (armv7_switch_hyp() == 0)
 193                         debug("entered HYP mode\n");
 194 #else
 195                 debug("entered non-secure state\n");
 196 #endif
 197 #endif
 198
 199 #ifdef CONFIG_ARM64
 200         smp_kick_all_cpus();
 201         flush_dcache_all();     /* flush cache before swtiching to EL2 */
 202         armv8_switch_to_el2();
 203 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
 204         armv8_switch_to_el1();
 205 #endif
 206 #endif
 207 }
 208
 209 /* Subcommand: PREP */
 210 static void boot_prep_linux(bootm_headers_t *images)
 211 {
 212         char *commandline = getenv("bootargs");
 213
 214         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
 215 #ifdef CONFIG_OF_LIBFDT
 216                 debug("using: FDT\n");
 217                 if (image_setup_linux(images)) {
 218                         printf("FDT creation failed! hanging...");
 219                         hang();
 220                 }
 221 #endif
 222         } else if (BOOTM_ENABLE_TAGS) {
 223                 debug("using: ATAGS\n");
 224                 setup_start_tag(gd->bd);
 225                 if (BOOTM_ENABLE_SERIAL_TAG)
 226                         setup_serial_tag(&params);
 227                 if (BOOTM_ENABLE_CMDLINE_TAG)
 228                         setup_commandline_tag(gd->bd, commandline);
 229                 if (BOOTM_ENABLE_REVISION_TAG)
 230                         setup_revision_tag(&params);
 231                 if (BOOTM_ENABLE_MEMORY_TAGS)
 232                         setup_memory_tags(gd->bd);
 233                 if (BOOTM_ENABLE_INITRD_TAG) {
 234                         if (images->rd_start && images->rd_end) {
 235                                 setup_initrd_tag(gd->bd, images->rd_start,
 236                                                  images->rd_end);
 237                         }
 238                 }
 239                 setup_board_tags(&params);
 240                 setup_end_tag(gd->bd);
 241         } else {
 242                 printf("FDT and ATAGS support not compiled in - hanging\n");
 243                 hang();
 244         }
 245         do_nonsec_virt_switch();
 246 }
 247
 248 /* Subcommand: GO */
 249 static void boot_jump_linux(bootm_headers_t *images, int flag)
 250 {
 251 #ifdef CONFIG_ARM64
 252         void (*kernel_entry)(void *fdt_addr);
 253         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 254
 255         kernel_entry = (void (*)(void *fdt_addr))images->ep;
 256
 257         debug("## Transferring control to Linux (at address %lx)...\n",
 258                 (ulong) kernel_entry);
 259         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 260
 261         announce_and_cleanup(fake);
 262
 263         if (!fake)
 264                 kernel_entry(images->ft_addr);
 265 #else
 266         unsigned long machid = gd->bd->bi_arch_number;
 267         char *s;
 268         void (*kernel_entry)(int zero, int arch, uint params);
 269         unsigned long r2;
 270         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 271
 272         kernel_entry = (void (*)(int, int, uint))images->ep;
 273
 274         s = getenv("machid");
 275         if (s) {
 276                 strict_strtoul(s, 16, &machid);
 277                 printf("Using machid 0x%lx from environment\n", machid);
 278         }
 279
 280         debug("## Transferring control to Linux (at address %08lx)" \
 281                 "...\n", (ulong) kernel_entry);
 282         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 283         announce_and_cleanup(fake);
 284
 285         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
 286                 r2 = (unsigned long)images->ft_addr;
 287         else
 288                 r2 = gd->bd->bi_boot_params;
 289
 290         if (!fake)
 291                 kernel_entry(0, machid, r2);
 292 #endif
 293 }
 294
 295 /* Main Entry point for arm bootm implementation
 296  *
 297  * Modeled after the powerpc implementation
 298  * DIFFERENCE: Instead of calling prep and go at the end
 299  * they are called if subcommand is equal 0.
 300  */
 301 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 302 {
 303         /* No need for those on ARM */
 304         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 305                 return -1;
 306
 307         if (flag & BOOTM_STATE_OS_PREP) {
 308                 boot_prep_linux(images);
 309                 return 0;
 310         }
 311
 312         if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
 313                 boot_jump_linux(images, flag);
 314                 return 0;
 315         }
 316
 317         boot_prep_linux(images);
 318         boot_jump_linux(images, flag);
 319         return 0;
 320 }
 321
 322 #ifdef CONFIG_CMD_BOOTZ
 323
 324 struct zimage_header {
 325         uint32_t        code[9];
 326         uint32_t        zi_magic;
 327         uint32_t        zi_start;
 328         uint32_t        zi_end;
 329 };
 330
 331 #define LINUX_ARM_ZIMAGE_MAGIC  0x016f2818
 332
 333 int bootz_setup(ulong image, ulong *start, ulong *end)
 334 {
 335         struct zimage_header *zi;
 336
 337         zi = (struct zimage_header *)map_sysmem(image, 0);
 338         if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
 339                 puts("Bad Linux ARM zImage magic!\n");
 340                 return 1;
 341         }
 342
 343         *start = zi->zi_start;
 344         *end = zi->zi_end;
 345
 346         printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start,
 347               *end);
 348
 349         return 0;
 350 }
 351
 352 #endif  /* CONFIG_CMD_BOOTZ */
 353
 354 #if defined(CONFIG_BOOTM_VXWORKS)
 355 void boot_prep_vxworks(bootm_headers_t *images)
 356 {
 357 #if defined(CONFIG_OF_LIBFDT)
 358         int off;
 359
 360         if (images->ft_addr) {
 361                 off = fdt_path_offset(images->ft_addr, "/memory");
 362                 if (off < 0) {
 363                         if (arch_fixup_memory_node(images->ft_addr))
 364                                 puts("## WARNING: fixup memory failed!\n");
 365                 }
 366         }
 367 #endif
 368         cleanup_before_linux();
 369 }
 370 void boot_jump_vxworks(bootm_headers_t *images)
 371 {
 372         /* ARM VxWorks requires device tree physical address to be passed */
 373         ((void (*)(void *))images->ep)(images->ft_addr);
 374 }
 375 #endif