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
  26 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
  27 #include <asm/armv7.h>
  28 #endif
  29
  30 DECLARE_GLOBAL_DATA_PTR;
  31
  32 static struct tag *params;
  33
  34 static ulong get_sp(void)
  35 {
  36         ulong ret;
  37
  38         asm("mov %0, sp" : "=r"(ret) : );
  39         return ret;
  40 }
  41
  42 void arch_lmb_reserve(struct lmb *lmb)
  43 {
  44         ulong sp;
  45
  46         /*
  47          * Booting a (Linux) kernel image
  48          *
  49          * Allocate space for command line and board info - the
  50          * address should be as high as possible within the reach of
  51          * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
  52          * memory, which means far enough below the current stack
  53          * pointer.
  54          */
  55         sp = get_sp();
  56         debug("## Current stack ends at 0x%08lx ", sp);
  57
  58         /* adjust sp by 4K to be safe */
  59         sp -= 4096;
  60         lmb_reserve(lmb, sp,
  61                     gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
  62 }
  63
  64 /**
  65  * announce_and_cleanup() - Print message and prepare for kernel boot
  66  *
  67  * @fake: non-zero to do everything except actually boot
  68  */
  69 static void announce_and_cleanup(int fake)
  70 {
  71         printf("\nStarting kernel ...%s\n\n", fake ?
  72                 "(fake run for tracing)" : "");
  73         bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
  74 #ifdef CONFIG_BOOTSTAGE_FDT
  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 #ifdef CONFIG_ARM64
 189 static void do_nonsec_virt_switch(void)
 190 {
 191         smp_kick_all_cpus();
 192         flush_dcache_all();     /* flush cache before swtiching to EL2 */
 193         armv8_switch_to_el2();
 194 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
 195         armv8_switch_to_el1();
 196 #endif
 197 }
 198 #endif
 199
 200 /* Subcommand: PREP */
 201 static void boot_prep_linux(bootm_headers_t *images)
 202 {
 203         char *commandline = getenv("bootargs");
 204
 205         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
 206 #ifdef CONFIG_OF_LIBFDT
 207                 debug("using: FDT\n");
 208                 if (image_setup_linux(images)) {
 209                         printf("FDT creation failed! hanging...");
 210                         hang();
 211                 }
 212 #endif
 213         } else if (BOOTM_ENABLE_TAGS) {
 214                 debug("using: ATAGS\n");
 215                 setup_start_tag(gd->bd);
 216                 if (BOOTM_ENABLE_SERIAL_TAG)
 217                         setup_serial_tag(&params);
 218                 if (BOOTM_ENABLE_CMDLINE_TAG)
 219                         setup_commandline_tag(gd->bd, commandline);
 220                 if (BOOTM_ENABLE_REVISION_TAG)
 221                         setup_revision_tag(&params);
 222                 if (BOOTM_ENABLE_MEMORY_TAGS)
 223                         setup_memory_tags(gd->bd);
 224                 if (BOOTM_ENABLE_INITRD_TAG) {
 225                         if (images->rd_start && images->rd_end) {
 226                                 setup_initrd_tag(gd->bd, images->rd_start,
 227                                                  images->rd_end);
 228                         }
 229                 }
 230                 setup_board_tags(&params);
 231                 setup_end_tag(gd->bd);
 232         } else {
 233                 printf("FDT and ATAGS support not compiled in - hanging\n");
 234                 hang();
 235         }
 236 }
 237
 238 /* Subcommand: GO */
 239 static void boot_jump_linux(bootm_headers_t *images, int flag)
 240 {
 241 #ifdef CONFIG_ARM64
 242         void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
 243                         void *res2);
 244         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 245
 246         kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
 247                                 void *res2))images->ep;
 248
 249         debug("## Transferring control to Linux (at address %lx)...\n",
 250                 (ulong) kernel_entry);
 251         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 252
 253         announce_and_cleanup(fake);
 254
 255         if (!fake) {
 256                 do_nonsec_virt_switch();
 257                 kernel_entry(images->ft_addr, NULL, NULL, NULL);
 258         }
 259 #else
 260         unsigned long machid = gd->bd->bi_arch_number;
 261         char *s;
 262         void (*kernel_entry)(int zero, int arch, uint params);
 263         unsigned long r2;
 264         int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
 265
 266         kernel_entry = (void (*)(int, int, uint))images->ep;
 267
 268         s = getenv("machid");
 269         if (s) {
 270                 strict_strtoul(s, 16, &machid);
 271                 printf("Using machid 0x%lx from environment\n", machid);
 272         }
 273
 274         debug("## Transferring control to Linux (at address %08lx)" \
 275                 "...\n", (ulong) kernel_entry);
 276         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 277         announce_and_cleanup(fake);
 278
 279         if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
 280                 r2 = (unsigned long)images->ft_addr;
 281         else
 282                 r2 = gd->bd->bi_boot_params;
 283
 284         if (!fake) {
 285 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
 286                 armv7_init_nonsec();
 287                 secure_ram_addr(_do_nonsec_entry)(kernel_entry,
 288                                                   0, machid, r2);
 289 #else
 290                 kernel_entry(0, machid, r2);
 291 #endif
 292         }
 293 #endif
 294 }
 295
 296 /* Main Entry point for arm bootm implementation
 297  *
 298  * Modeled after the powerpc implementation
 299  * DIFFERENCE: Instead of calling prep and go at the end
 300  * they are called if subcommand is equal 0.
 301  */
 302 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 303 {
 304         /* No need for those on ARM */
 305         if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
 306                 return -1;
 307
 308         if (flag & BOOTM_STATE_OS_PREP) {
 309                 boot_prep_linux(images);
 310                 return 0;
 311         }
 312
 313         if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
 314                 boot_jump_linux(images, flag);
 315                 return 0;
 316         }
 317
 318         boot_prep_linux(images);
 319         boot_jump_linux(images, flag);
 320         return 0;
 321 }
 322
 323 #ifdef CONFIG_CMD_BOOTZ
 324
 325 struct zimage_header {
 326         uint32_t        code[9];
 327         uint32_t        zi_magic;
 328         uint32_t        zi_start;
 329         uint32_t        zi_end;
 330 };
 331
 332 #define LINUX_ARM_ZIMAGE_MAGIC  0x016f2818
 333
 334 int bootz_setup(ulong image, ulong *start, ulong *end)
 335 {
 336         struct zimage_header *zi;
 337
 338         zi = (struct zimage_header *)map_sysmem(image, 0);
 339         if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
 340                 puts("Bad Linux ARM zImage magic!\n");
 341                 return 1;
 342         }
 343
 344         *start = zi->zi_start;
 345         *end = zi->zi_end;
 346
 347         printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start,
 348               *end);
 349
 350         return 0;
 351 }
 352
 353 #endif  /* CONFIG_CMD_BOOTZ */
 354
 355 #if defined(CONFIG_BOOTM_VXWORKS)
 356 void boot_prep_vxworks(bootm_headers_t *images)
 357 {
 358 #if defined(CONFIG_OF_LIBFDT)
 359         int off;
 360
 361         if (images->ft_addr) {
 362                 off = fdt_path_offset(images->ft_addr, "/memory");
 363                 if (off < 0) {
 364                         if (arch_fixup_fdt(images->ft_addr))
 365                                 puts("## WARNING: fixup memory failed!\n");
 366                 }
 367         }
 368 #endif
 369         cleanup_before_linux();
 370 }
 371 void boot_jump_vxworks(bootm_headers_t *images)
 372 {
 373         /* ARM VxWorks requires device tree physical address to be passed */
 374         ((void (*)(void *))images->ep)(images->ft_addr);
 375 }
 376 #endif