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phase2.c

/*
 * (C) Copyright 2008 Openmoko, Inc.
 * Author: Andy Green <andy@openmoko.org>
 *
 * Parse the U-Boot header and Boot Linux
 * based on various code from U-Boot
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <qi.h>
#include <neo_gta02.h>
#include "blink_led.h"
#include <string.h>
#define __ARM__
#include <image.h>
#include <setup.h>
#include <ext2.h>


typedef void (*the_kernel_fn)(int zero, int arch, uint params);

unsigned long partition_offset_blocks = 0;
unsigned long partition_length_blocks = 0;

struct kernel_source const * this_kernel = 0;

static const int INITRD_OFFSET = (8 * 1024 * 1024);


int raise(int n)
{
      return 0;
}

static void indicate(enum ui_indication ui_indication)
{
      if (this_board->set_ui_indication)
            (this_board->set_ui_indication)(ui_indication);
}

static int read_file(const char * filepath, u8 * destination, int size)
{
      int len = size;
      int ret;

      switch (this_kernel->filesystem) {
      case FS_EXT2:
            if (!ext2fs_mount()) {
                  puts("Unable to mount ext2 filesystem\n");
                  indicate(UI_IND_MOUNT_FAIL);
                  return -2; /* death */
            }
            puts("    EXT2 open: ");
            puts(filepath);
            len = ext2fs_open(filepath);
            if (len < 0) {
                  puts(" Open failed\n");
                  return -1;
            }
            puts(" OK\n");
            ret = ext2fs_read((char *)destination, size);
            if (ret < 0) {
                  puts(" Read failed\n");
                  return -1;
            }
            break;

      case FS_FAT:
            /* FIXME */
      case FS_RAW:
            /* any filename-related request in raw filesystem will fail */
            if (filepath)
                  return -1;
            puts("     RAW open: +");
            printdec(partition_offset_blocks);
            puts(" 512-byte blocks\n");
            if (this_kernel->block_read(destination,
                              partition_offset_blocks, size >> 9) < 0) {
                  puts("Bad kernel header\n");
                  return -1;
            }
            break;
      }

      return len;
}

static int do_block_init(void)
{
      static void * last_block_init = NULL;
      static int last_block_init_result = 0;
      int fresh = 0;

      /* if this device needs initializing, try to init it */
      if (!this_kernel->block_init)
            return 1; /* happy */

      /*
       * cache result to limit attempts for same
       * block device to one time
       */
      if (this_kernel->block_init != last_block_init) {
            last_block_init = this_kernel->block_init;
            last_block_init_result = (this_kernel->block_init)();
            fresh = 1;
      }

      if (last_block_init_result) {
            puts("block device init failed\n");
            if (fresh)
                  indicate(UI_IND_MOUNT_FAIL);

            return 0; /* failed */
      }
      last_block_init = this_kernel->block_init;

      return 1; /* happy */
}

static int do_partitions(void *kernel_dram)
{
      unsigned char *p = kernel_dram;

      /* if there's a partition table implied, parse it, otherwise
       * just use a fixed offset
       */
      if (!this_kernel->partition_index) {
            partition_offset_blocks =
                    this_kernel->offset_blocks512_if_no_partition;
            return 1;
      }

      if ((int)this_kernel->block_read(kernel_dram, 0, 4) < 0) {
            puts("Bad partition read\n");
            indicate(UI_IND_MOUNT_FAIL);
            return 0;
      }

      if ((p[0x1fe] != 0x55) || (p[0x1ff] != 0xaa)) {
            puts("partition signature missing\n");
            indicate(UI_IND_MOUNT_FAIL);
            return 0;
      }

      p += 0x1be + 8 + (0x10 * (this_kernel->partition_index - 1));

      partition_offset_blocks = (((u32)p[3]) << 24) |
                          (((u32)p[2]) << 16) |
                          (((u32)p[1]) << 8) |
                          p[0];
      partition_length_blocks = (((u32)p[7]) << 24) |
                          (((u32)p[6]) << 16) |
                          (((u32)p[5]) << 8) |
                          p[4];

      puts("    Partition: ");
      printdec(this_kernel->partition_index);
      puts(" start +");
      printdec(partition_offset_blocks);
      puts(" 512-byte blocks, size ");
      printdec(partition_length_blocks / 2048);
      puts(" MiB\n");

      return 1;
}

static void do_params(unsigned initramfs_len,
    const char *commandline_rootfs_append)
{
      const struct board_variant * board_variant =
                                    (this_board->get_board_variant)();
      const char *p;
      char * cmdline;
      struct tag *params = (struct tag *)this_board->linux_tag_placement;

      /* eat leading white space */
      for (p = this_board->commandline_board; *p == ' '; p++);

      /* first tag */
      params->hdr.tag = ATAG_CORE;
      params->hdr.size = tag_size(tag_core);
      params->u.core.flags = 0;
      params->u.core.pagesize = 0;
      params->u.core.rootdev = 0;
      params = tag_next(params);

      /* revision tag */
      params->hdr.tag = ATAG_REVISION;
      params->hdr.size = tag_size(tag_revision);
      params->u.revision.rev = board_variant->machine_revision;
      params = tag_next(params);

      /* memory tags */
      params->hdr.tag = ATAG_MEM;
      params->hdr.size = tag_size(tag_mem32);
      params->u.mem.start = this_board->linux_mem_start;
      params->u.mem.size = this_board->linux_mem_size;
      params = tag_next(params);

      if (this_kernel->initramfs_filepath) {
            /* INITRD2 tag */
            params->hdr.tag = ATAG_INITRD2;
            params->hdr.size = tag_size(tag_initrd);
            params->u.initrd.start = this_board->linux_mem_start +
                                                INITRD_OFFSET;
            params->u.initrd.size = initramfs_len;
            params = tag_next(params);
      }

      /* kernel commandline */

      cmdline = params->u.cmdline.cmdline;

      /* start with the fixed device part of the commandline */

      cmdline += strlen(strcpy(cmdline, p));

      /* if the board itself needs a computed commandline, add it now */

      if (this_board->append_device_specific_cmdline)
            cmdline = (this_board->append_device_specific_cmdline)(cmdline);

      /* If he is giving an append commandline for this rootfs, apply that */

      if (this_kernel->commandline_append)
            cmdline += strlen(strcpy(cmdline,
                              this_kernel->commandline_append));
            if (commandline_rootfs_append[0])
                  cmdline += strlen(strcpy(cmdline,
                              commandline_rootfs_append));

      /* deal with any trailing newlines that hitched a ride */

      while (*(cmdline - 1) == '\n')
            cmdline--;

      *cmdline = '\0';

      /*
       * if he's still holding down the UI_ACTION_SKIPKERNEL key
       * now we finished loading the kernel, take it to mean he wants
       * to have the debugging options added to the commandline
       */

      if (this_board->commandline_board_debug && this_board->get_ui_debug)
            if ((this_board->get_ui_debug)())
                  cmdline += strlen(strcpy(cmdline, this_board->
                                    commandline_board_debug));

      params->hdr.tag = ATAG_CMDLINE;
      params->hdr.size = (sizeof(struct tag_header) +
            strlen(params->u.cmdline.cmdline) + 1 + 4) >> 2;

      puts("      Cmdline: ");
      puts(params->u.cmdline.cmdline);
      puts("\n");

      params = tag_next(params);

      /* needs to always be the last tag */
      params->hdr.tag = ATAG_NONE;
      params->hdr.size = 0;
}

static int do_crc(const image_header_t *hdr, const void *kernel_dram)
{
      unsigned long crc;

      /*
       * It's good for now to know that our kernel is intact from
       * the storage before we jump into it and maybe crash silently
       * even though it costs us some time
       */
      crc = crc32(0, kernel_dram + sizeof(image_header_t),
                                       __be32_to_cpu(hdr->ih_size));
      if (crc == __be32_to_cpu(hdr->ih_dcrc))
            return 1;

      puts("\nKernel CRC ERROR: read 0x");
      print32(crc);
      puts(" vs hdr CRC 0x");
      print32(__be32_to_cpu(hdr->ih_dcrc));
      puts("\n");

      return 0;
}

static the_kernel_fn load_uimage(void *kernel_dram)
{
      image_header_t    *hdr;
      u32 kernel_size;

      hdr = (image_header_t *)kernel_dram;

      if (__be32_to_cpu(hdr->ih_magic) != IH_MAGIC) {
            puts("bad magic ");
            print32(hdr->ih_magic);
            puts("\n");
            return NULL;
      }

      puts("        Found: \"");
      puts((const char *)hdr->ih_name);
      puts("\"\n         Size: ");
      printdec(__be32_to_cpu(hdr->ih_size) >> 10);
      puts(" KiB\n");

      kernel_size = ((__be32_to_cpu(hdr->ih_size) +
                    sizeof(image_header_t) + 2048) & ~(2048 - 1));

      if (read_file(this_kernel->filepath, kernel_dram, kernel_size) < 0) {
            indicate(UI_IND_KERNEL_PULL_FAIL);
            return NULL;
      }

      indicate(UI_IND_KERNEL_PULL_OK);

      if (!do_crc(hdr, kernel_dram))
            return NULL;

      return (the_kernel_fn) (((char *)hdr) + sizeof(image_header_t));
}

static the_kernel_fn load_zimage(void *kernel_dram)
{
      u32 magic = *(u32 *) (kernel_dram + 0x24);
      u32 size = *(u32 *) (kernel_dram + 0x2c);
      int got;

      if (magic != 0x016f2818) {
            puts("bad magic ");
            print32(magic);
            puts("\n");
            return NULL;
      }

      puts("         Size: ");
      printdec(size >> 10);
      puts(" KiB\n");

      got = read_file(this_kernel->filepath, kernel_dram, size);
      if (got < 0) {
            indicate(UI_IND_KERNEL_PULL_FAIL);
            return NULL;
      }

      if (got != size) {
            puts("short kernel\n");
            return NULL;
      }

      indicate(UI_IND_KERNEL_PULL_OK);

      return (the_kernel_fn) kernel_dram;
}

static void try_this_kernel(void)
{
      the_kernel_fn the_kernel;
      unsigned int initramfs_len = 0;
      static char commandline_rootfs_append[512] = "";
      int ret;
      void * kernel_dram = (void *)this_board->linux_mem_start + 0x8000;

      partition_offset_blocks = 0;
      partition_length_blocks = 0;

      puts("\nTrying kernel: ");
      puts(this_kernel->name);
      puts("\n");

      indicate(UI_IND_MOUNT_PART);

      if (!do_block_init())
            return;

      if (!do_partitions(kernel_dram))
            return;

      /* does he want us to skip this? */

      ret = read_file(this_board->noboot, kernel_dram, 512);
      if (ret != -1) {
            /* -2 (mount fail) should make us give up too */
            if (ret >= 0) {
                  puts("    (Skipping on finding ");
                  puts(this_board->noboot);
                  puts(")\n");
                  indicate(UI_IND_SKIPPING);
            }
            return;
      }

      /* is there a commandline append file? */

      commandline_rootfs_append[0] = '\0';
      read_file(this_board->append, (u8 *)commandline_rootfs_append, 512);

      indicate(UI_IND_KERNEL_PULL);

      /* pull the kernel image */

      if (read_file(this_kernel->filepath, kernel_dram, 4096) < 0)
            return;

      the_kernel = load_uimage(kernel_dram);
      if (!the_kernel)
            the_kernel = load_zimage(kernel_dram);
      if (!the_kernel)
            return;

      /* initramfs if needed */

      if (this_kernel->initramfs_filepath) {
            indicate(UI_IND_INITRAMFS_PULL);
            initramfs_len = read_file(this_kernel->initramfs_filepath,
                  (u8 *)this_board->linux_mem_start + INITRD_OFFSET,
                                          16 * 1024 * 1024);
            if (initramfs_len < 0) {
                  puts("initramfs load failed\n");
                  indicate(UI_IND_INITRAMFS_PULL_FAIL);
                  return;
            }
            indicate(UI_IND_INITRAMFS_PULL_OK);
      }

      do_params(initramfs_len, commandline_rootfs_append);

      /* give board implementation a chance to shut down
       * anything it may have going on, leave GPIO set for Linux
       */
      if (this_board->close)
            (this_board->close)();

      puts("Starting --->\n\n");
      indicate(UI_IND_KERNEL_START);

      /*
      * ooh that's it, we're gonna try boot this image!
      * never mind the cache, Linux will take care of it
      */
      the_kernel(0, this_board->linux_machine_id,
                              this_board->linux_tag_placement);

      /* we won't come back here no matter what */
}

void bootloader_second_phase(void)
{
      /* give device a chance to print device-specific things */

      if (this_board->post_serial_init)
            (this_board->post_serial_init)();

      /* we try the possible kernels for this board in order */

      for (this_kernel = this_board->kernel_source; this_kernel->name;
          this_kernel++)
            try_this_kernel();

      /* none of the kernels worked out */

      puts("\nNo usable kernel image found\n");

      /*
       * sit there doing a memory test in this case.
       *
       * This phase 2 code will get destroyed but it's OK, we won't be
       * coming back and the whole memory test and dependency functions are
       * in phase 1 / steppingstone, so we can test entire memory range.
       *
       * It means we just boot with SD Card with kernel(s) renamed or removed
       * to provoke memory test.
       */

      indicate(UI_IND_MEM_TEST);

      memory_test((void *)this_board->linux_mem_start,
                                        this_board->linux_mem_size);

}

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