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