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