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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 genarch
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <genarch/multiboot/multiboot.h>
  36. #include <arch/types.h>
  37. #include <typedefs.h>
  38. #include <config.h>
  39. #include <string.h>
  40. #include <macros.h>
  41.  
  42. /** Extract command name from the multiboot module command line.
  43.  *
  44.  * @param buf      Destination buffer (will always null-terminate).
  45.  * @param n        Size of destination buffer.
  46.  * @param cmd_line Input string (the command line).
  47.  *
  48.  */
  49. static void extract_command(char *buf, size_t n, const char *cmd_line)
  50. {
  51.     const char *start, *end, *cp;
  52.     size_t max_len;
  53.    
  54.     /* Find the first space. */
  55.     end = strchr(cmd_line, ' ');
  56.     if (end == NULL)
  57.         end = cmd_line + strlen(cmd_line);
  58.    
  59.     /*
  60.      * Find last occurence of '/' before 'end'. If found, place start at
  61.      * next character. Otherwise, place start at beginning of buffer.
  62.      */
  63.     cp = end;
  64.     start = buf;
  65.     while (cp != start) {
  66.         if (*cp == '/') {
  67.             start = cp + 1;
  68.             break;
  69.         }
  70.         --cp;
  71.     }
  72.    
  73.     /* Copy the command and null-terminate the string. */
  74.     max_len = min(n - 1, (size_t) (end - start));
  75.     strncpy(buf, start, max_len + 1);
  76.     buf[max_len] = '\0';
  77. }
  78.  
  79. /** Parse multiboot information structure.
  80.  *
  81.  * If @a signature does not contain a valid multiboot signature,
  82.  * assumes no multiboot information is available.
  83.  *
  84.  * @param signature Should contain the multiboot signature.
  85.  * @param mi        Pointer to the multiboot information structure.
  86.  */
  87. void multiboot_info_parse(uint32_t signature, const multiboot_info_t *mi)
  88. {
  89.     uint32_t flags;
  90.     multiboot_mod_t *mods;
  91.     uint32_t i;
  92.    
  93.     if (signature == MULTIBOOT_LOADER_MAGIC)
  94.         flags = mi->flags;
  95.     else {
  96.         /* No multiboot info available. */
  97.         flags = 0;
  98.     }
  99.    
  100.     /* Copy module information. */
  101.    
  102.     if ((flags & MBINFO_FLAGS_MODS) != 0) {
  103.         init.cnt = min(mi->mods_count, CONFIG_INIT_TASKS);
  104.         mods = (multiboot_mod_t *) MULTIBOOT_PTR(mi->mods_addr);
  105.        
  106.         for (i = 0; i < init.cnt; i++) {
  107.             init.tasks[i].addr = PA2KA(mods[i].start);
  108.             init.tasks[i].size = mods[i].end - mods[i].start;
  109.            
  110.             /* Copy command line, if available. */
  111.             if (mods[i].string) {
  112.                 extract_command(init.tasks[i].name,
  113.                     CONFIG_TASK_NAME_BUFLEN,
  114.                     MULTIBOOT_PTR(mods[i].string));
  115.             } else
  116.                 init.tasks[i].name[0] = '\0';
  117.         }
  118.     } else
  119.         init.cnt = 0;
  120.    
  121.     /* Copy memory map. */
  122.    
  123.     int32_t mmap_length;
  124.     multiboot_mmap_t *mme;
  125.     uint32_t size;
  126.    
  127.     if ((flags & MBINFO_FLAGS_MMAP) != 0) {
  128.         mmap_length = mi->mmap_length;
  129.         mme = MULTIBOOT_PTR(mi->mmap_addr);
  130.         e820counter = 0;
  131.        
  132.         i = 0;
  133.         while ((mmap_length > 0) && (i < MEMMAP_E820_MAX_RECORDS)) {
  134.             e820table[i++] = mme->mm_info;
  135.            
  136.             /* Compute address of next structure. */
  137.             size = sizeof(mme->size) + mme->size;
  138.             mme = ((void *) mme) + size;
  139.             mmap_length -= size;
  140.         }
  141.        
  142.         e820counter = i;
  143.     } else
  144.         e820counter = 0;
  145. }
  146.  
  147. /** @}
  148.  */
  149.