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  1. /*
  2.  * Copyright (c) 2009 Jiri Svoboda
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup ia32
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <main/main.h>
  36. #include <arch/boot/boot.h>
  37. #include <arch/boot/cboot.h>
  38. #include <arch/boot/memmap.h>
  39. #include <config.h>
  40. #include <memstr.h>
  41. #include <string.h>
  42. #include <macros.h>
  43.  
  44. /* This is a symbol so the type is only dummy. Obtain the value using &. */
  45. extern int _hardcoded_unmapped_size;
  46.  
  47. /** Extract command name from the multiboot module command line.
  48.  *
  49.  * @param buf       Destination buffer (will always null-terminate).
  50.  * @param n     Size of destination buffer.
  51.  * @param cmd_line  Input string (the command line).           
  52.  */
  53. static void extract_command(char *buf, size_t n, const char *cmd_line)
  54. {
  55.     const char *start, *end, *cp;
  56.     size_t max_len;
  57.  
  58.     /* Find the first space. */
  59.     end = strchr(cmd_line, ' ');
  60.     if (end == NULL) end = cmd_line + strlen(cmd_line);
  61.  
  62.     /*
  63.      * Find last occurence of '/' before 'end'. If found, place start at
  64.      * next character. Otherwise, place start at beginning of buffer.
  65.      */
  66.     cp = end;
  67.     start = buf;
  68.     while (cp != start) {
  69.         if (*cp == '/') {
  70.             start = cp + 1;
  71.             break;
  72.         }
  73.         --cp;
  74.     }
  75.  
  76.     /* Copy the command and null-terminate the string. */
  77.     max_len = min(n - 1, (size_t) (end - start));
  78.     strncpy(buf, start, max_len + 1);
  79.     buf[max_len] = '\0';
  80. }
  81.  
  82. /** C part of ia32 boot sequence.
  83.  * @param signature Should contain the multiboot signature.
  84.  * @param mi        Pointer to the multiboot information structure.
  85.  */
  86. void ia32_cboot(uint32_t signature, const mb_info_t *mi)
  87. {
  88.     uint32_t flags;
  89.     mb_mod_t *mods;
  90.     uint32_t i;
  91.  
  92.     if (signature == MULTIBOOT_LOADER_MAGIC) {
  93.         flags = mi->flags;
  94.     } else {
  95.         /* No multiboot info available. */
  96.         flags = 0;
  97.     }
  98.  
  99.     /* Copy module information. */
  100.  
  101.     if ((flags & MBINFO_FLAGS_MODS) != 0) {
  102.         init.cnt = mi->mods_count;
  103.         mods = mi->mods_addr;
  104.  
  105.         for (i = 0; i < init.cnt; i++) {
  106.             init.tasks[i].addr = mods[i].start + 0x80000000;
  107.             init.tasks[i].size = mods[i].end - mods[i].start;
  108.  
  109.             /* Copy command line, if available. */
  110.             if (mods[i].string) {
  111.                 extract_command(init.tasks[i].name,
  112.                     CONFIG_TASK_NAME_BUFLEN,
  113.                     mods[i].string);
  114.             } else {
  115.                 init.tasks[i].name[0] = '\0';
  116.             }
  117.         }
  118.     } else {
  119.         init.cnt = 0;
  120.     }
  121.  
  122.     /* Copy memory map. */
  123.  
  124.     int32_t mmap_length;
  125.     mb_mmap_t *mme;
  126.     uint32_t size;
  127.  
  128.     if ((flags & MBINFO_FLAGS_MMAP) != 0) {
  129.         mmap_length = mi->mmap_length;
  130.         mme = mi->mmap_addr;
  131.         e820counter = 0;
  132.  
  133.         i = 0;
  134.         while (mmap_length > 0) {
  135.             e820table[i++] = mme->mm_info;
  136.  
  137.             /* Compute address of next structure. */
  138.             size = sizeof(mme->size) + mme->size;
  139.             mme = ((void *) mme) + size;
  140.             mmap_length -= size;
  141.         }
  142.  
  143.         e820counter = i;
  144.     } else {
  145.         e820counter = 0;
  146.     }
  147.  
  148. #ifdef CONFIG_SMP
  149.     /* Copy AP bootstrap routines below 1 MB. */
  150.     memcpy((void *) AP_BOOT_OFFSET, (void *) BOOT_OFFSET,
  151.         (size_t) &_hardcoded_unmapped_size);
  152. #endif
  153.  
  154.     main_bsp();
  155. }
  156.  
  157. /** @}
  158.  */
  159.