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         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(&params);
 219                 if (BOOTM_ENABLE_CMDLINE_TAG)
 220                         setup_commandline_tag(gd->bd, commandline);
 221                 if (BOOTM_ENABLE_REVISION_TAG)
 222                         setup_revision_tag(&params);
 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(&params);
 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 */