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 <vxworks.h>
  19 #include <u-boot/zlib.h>
  20 #include <asm/byteorder.h>
  21 #include <libfdt.h>
  22 #include <fdt_support.h>
  23 #include <asm/bootm.h>
  24 #include <asm/secure.h>
  25 #include <linux/compiler.h>
  26 #include <bootm.h>
  27 #include <vxworks.h>
  28
  29 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
  30 #include <asm/armv7.h>
  31 #endif
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 static struct tag *params;
  36
  37 static ulong get_sp(void)
  38 {
  39         ulong ret;
  40
  41         asm("mov %0, sp" : "=r"(ret) : );
  42         return ret;
  43 }
  44
  45 void arch_lmb_reserve(struct lmb *lmb)
  46 {
  47         ulong sp;
  48
  49         /*
  50          * Booting a (Linux) kernel image
  51          *
  52          * Allocate space for command line and board info - the
  53          * address should be as high as possible within the reach of
  54          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  55          * memory, which means far enough below the current stack
  56          * pointer.
  57          */
  58         sp = get_sp();
  59         debug("## Current stack ends at 0x%08lx ", sp);
  60
  61         /* adjust sp by 4K to be safe */
  62         sp -= 4096;
  63         lmb_reserve(lmb, sp,
  64                     gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
  65 }
  66
  67 /**
  68  * announce_and_cleanup() - Print message and prepare for kernel boot
  69  *
  70  * @fake: non-zero to do everything except actually boot
  71  */
  72 static void announce_and_cleanup(int fake)
  73 {
  74         printf("\nStarting kernel ...%s\n\n", fake ?
  75                 "(fake run for tracing)" : "");
  76         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  77 #ifdef CONFIG_BOOTSTAGE_FDT
  78         bootstage_fdt_add_report();
  79 #endif
  80 #ifdef CONFIG_BOOTSTAGE_REPORT
  81         bootstage_report();
  82 #endif
  83
  84 #ifdef CONFIG_USB_DEVICE
  85         udc_disconnect();
  86 #endif
  87         cleanup_before_linux();
  88 }
  89
  90 static void setup_start_tag (bd_t *bd)
  91 {
  92         params = (struct tag *)bd->bi_boot_params;
  93
  94         params->hdr.tag = ATAG_CORE;
  95         params->hdr.size = tag_size (tag_core);
  96
  97         params->u.core.flags = 0;
  98         params->u.core.pagesize = 0;
  99         params->u.core.rootdev = 0;
 100
 101         params = tag_next (params);
 102 }
 103
 104 static void setup_memory_tags(bd_t *bd)
 105 {
 106         int i;
 107
 108         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 109                 params->hdr.tag = ATAG_MEM;
 110                 params->hdr.size = tag_size (tag_mem32);
 111
 112                 params->u.mem.start = bd->bi_dram[i].start;
 113                 params->u.mem.size = bd->bi_dram[i].size;
 114
 115                 params = tag_next (params);
 116         }
 117 }
 118
 119 static void setup_commandline_tag(bd_t *bd, char *commandline)
 120 {
 121         char *p;
 122
 123         if (!commandline)
 124                 return;
 125
 126         /* eat leading white space */
 127         for (p = commandline; *p == ' '; p++);
 128
 129         /* skip non-existent command lines so the kernel will still
 130          * use its default command line.
 131          */
 132         if (*p == '\0')
 133                 return;
 134
 135         params->hdr.tag = ATAG_CMDLINE;
 136         params->hdr.size =
 137                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 138
 139         strcpy (params->u.cmdline.cmdline, p);
 140
 141         params = tag_next (params);
 142 }
 143
 144 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
 145 {
 146         /* an ATAG_INITRD node tells the kernel where the compressed
 147          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 148          */
 149         params->hdr.tag = ATAG_INITRD2;
 150         params->hdr.size = tag_size (tag_initrd);
 151
 152         params->u.initrd.start = initrd_start;
 153         params->u.initrd.size = initrd_end - initrd_start;
 154
 155         params = tag_next (params);
 156 }
 157
 158 static void setup_serial_tag(struct tag **tmp)
 159 {
 160         struct tag *params = *tmp;
 161         struct tag_serialnr serialnr;
 162
 163         get_board_serial(&serialnr);
 164         params->hdr.tag = ATAG_SERIAL;
 165         params->hdr.size = tag_size (tag_serialnr);
 166         params->u.serialnr.low = serialnr.low;
 167         params->u.serialnr.high= serialnr.high;
 168         params = tag_next (params);
 169         *tmp = params;
 170 }
 171
 172 static void setup_revision_tag(struct tag **in_params)
 173 {
 174         u32 rev = 0;
 175
 176         rev = get_board_rev();
 177         params->hdr.tag = ATAG_REVISION;
 178         params->hdr.size = tag_size (tag_revision);
 179         params->u.revision.rev = rev;
 180         params = tag_next (params);
 181 }
 182
 183 static void setup_end_tag(bd_t *bd)
 184 {
 185         params->hdr.tag = ATAG_NONE;
 186         params->hdr.size = 0;
 187 }
 188
 189 __weak void setup_board_tags(struct tag **in_params) {}
 190
 191 #ifdef CONFIG_ARM64
 192 static void do_nonsec_virt_switch(void)
 193 {
 194         smp_kick_all_cpus();
 195         flush_dcache_all();     /* flush cache before swtiching to EL2 */
 196         armv8_switch_to_el2();
 197 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
 198         armv8_switch_to_el1();
 199 #endif
 200 }
 201 #endif
 202
 203 /* Subcommand: PREP */
 204 static void boot_prep_linux(bootm_headers_t *images)
 205 {
 206         char *commandline = getenv("bootargs");
 207
 208         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
 209 #ifdef CONFIG_OF_LIBFDT
 210                 debug("using: FDT\n");
 211                 if (image_setup_linux(images)) {
 212                         printf("FDT creation failed! hanging...");
 213                         hang();
 214                 }
 215 #endif
 216         } else if (BOOTM_ENABLE_TAGS) {
 217                 debug("using: ATAGS\n");
 218                 setup_start_tag(gd->bd);
 219                 if (BOOTM_ENABLE_SERIAL_TAG)
 220                         setup_serial_tag(&params);
 221                 if (BOOTM_ENABLE_CMDLINE_TAG)
 222                         setup_commandline_tag(gd->bd, commandline);
 223                 if (BOOTM_ENABLE_REVISION_TAG)
 224                         setup_revision_tag(&params);
 225                 if (BOOTM_ENABLE_MEMORY_TAGS)
 226                         setup_memory_tags(gd->bd);
 227                 if (BOOTM_ENABLE_INITRD_TAG) {
 228                         if (images->rd_start && images->rd_end) {
 229                                 setup_initrd_tag(gd->bd, images->rd_start,
 230                                                  images->rd_end);
 231                         }
 232                 }
 233                 setup_board_tags(&params);
 234                 setup_end_tag(gd->bd);
 235         } else {
 236                 printf("FDT and ATAGS support not compiled in - hanging\n");
 237                 hang();
 238         }
 239 }
 240
 241 /* Subcommand: GO */
 242 static void boot_jump_linux(bootm_headers_t *images, int flag)
 243 {
 244 #ifdef CONFIG_ARM64
 245         void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
 246                         void *res2);
 247         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 248
 249         kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
 250                                 void *res2))images->ep;
 251
 252         debug("## Transferring control to Linux (at address %lx)...\n",
 253                 (ulong) kernel_entry);
 254         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 255
 256         announce_and_cleanup(fake);
 257
 258         if (!fake) {
 259                 do_nonsec_virt_switch();
 260                 kernel_entry(images->ft_addr, NULL, NULL, NULL);
 261         }
 262 #else
 263         unsigned long machid = gd->bd->bi_arch_number;
 264         char *s;
 265         void (*kernel_entry)(int zero, int arch, uint params);
 266         unsigned long r2;
 267         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 268
 269         kernel_entry = (void (*)(int, int, uint))images->ep;
 270
 271         s = getenv("machid");
 272         if (s) {
 273                 strict_strtoul(s, 16, &machid);
 274                 printf("Using machid 0x%lx from environment\n", machid);
 275         }
 276
 277         debug("## Transferring control to Linux (at address %08lx)" \
 278                 "...\n", (ulong) kernel_entry);
 279         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 280         announce_and_cleanup(fake);
 281
 282         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
 283                 r2 = (unsigned long)images->ft_addr;
 284         else
 285                 r2 = gd->bd->bi_boot_params;
 286
 287         if (!fake) {
 288 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
 289                 armv7_init_nonsec();
 290                 secure_ram_addr(_do_nonsec_entry)(kernel_entry,
 291                                                   0, machid, r2);
 292 #else
 293                 kernel_entry(0, machid, r2);
 294 #endif
 295         }
 296 #endif
 297 }
 298
 299 /* Main Entry point for arm bootm implementation
 300  *
 301  * Modeled after the powerpc implementation
 302  * DIFFERENCE: Instead of calling prep and go at the end
 303  * they are called if subcommand is equal 0.
 304  */
 305 int do_bootm_linux(int flag, int argc, char * const argv[],
 306                    bootm_headers_t *images)
 307 {
 308         /* No need for those on ARM */
 309         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 310                 return -1;
 311
 312         if (flag & BOOTM_STATE_OS_PREP) {
 313                 boot_prep_linux(images);
 314                 return 0;
 315         }
 316
 317         if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
 318                 boot_jump_linux(images, flag);
 319                 return 0;
 320         }
 321
 322         boot_prep_linux(images);
 323         boot_jump_linux(images, flag);
 324         return 0;
 325 }
 326
 327 #ifdef CONFIG_CMD_BOOTZ
 328
 329 struct zimage_header {
 330         uint32_t        code[9];
 331         uint32_t        zi_magic;
 332         uint32_t        zi_start;
 333         uint32_t        zi_end;
 334 };
 335
 336 #define LINUX_ARM_ZIMAGE_MAGIC  0x016f2818
 337
 338 int bootz_setup(ulong image, ulong *start, ulong *end)
 339 {
 340         struct zimage_header *zi;
 341
 342         zi = (struct zimage_header *)map_sysmem(image, 0);
 343         if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
 344                 puts("Bad Linux ARM zImage magic!\n");
 345                 return 1;
 346         }
 347
 348         *start = zi->zi_start;
 349         *end = zi->zi_end;
 350
 351         printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start,
 352               *end);
 353
 354         return 0;
 355 }
 356
 357 #endif  /* CONFIG_CMD_BOOTZ */
 358
 359 #if defined(CONFIG_BOOTM_VXWORKS)
 360 void boot_prep_vxworks(bootm_headers_t *images)
 361 {
 362 #if defined(CONFIG_OF_LIBFDT)
 363         int off;
 364
 365         if (images->ft_addr) {
 366                 off = fdt_path_offset(images->ft_addr, "/memory");
 367                 if (off < 0) {
 368                         if (arch_fixup_fdt(images->ft_addr))
 369                                 puts("## WARNING: fixup memory failed!\n");
 370                 }
 371         }
 372 #endif
 373         cleanup_before_linux();
 374 }
 375 void boot_jump_vxworks(bootm_headers_t *images)
 376 {
 377         /* ARM VxWorks requires device tree physical address to be passed */
 378         ((void (*)(void *))images->ep)(images->ft_addr);
 379 }
 380 #endif