src/system/kernel/boot_item.cpp

   1 /*
   2  * Copyright 2005-2008, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include <boot_item.h>
   8 #include <util/DoublyLinkedList.h>
   9 #include <util/kernel_cpp.h>
  10
  11 #include <string.h>
  12
  13
  14 // ToDo: the boot items are not supposed to be changed after kernel startup
  15 //              so no locking is done. So for now, we need to be careful with adding
  16 //              new items.
  17
  18 struct boot_item : public DoublyLinkedListLinkImpl<boot_item> {
  19         const char      *name;
  20         void            *data;
  21         size_t          size;
  22 };
  23
  24 typedef DoublyLinkedList<boot_item> ItemList;
  25
  26
  27 static ItemList sItemList;
  28
  29
  30 status_t
  31 add_boot_item(const char *name, void *data, size_t size)
  32 {
  33         boot_item *item = new(nothrow) boot_item;
  34         if (item == NULL)
  35                 return B_NO_MEMORY;
  36
  37         item->name = name;
  38         item->data = data;
  39         item->size = size;
  40
  41         sItemList.Add(item);
  42         return B_OK;
  43 }
  44
  45
  46 void *
  47 get_boot_item(const char *name, size_t *_size)
  48 {
  49         if (name == NULL || name[0] == '\0')
  50                 return NULL;
  51
  52         // search item
  53         for (ItemList::Iterator it = sItemList.GetIterator(); it.HasNext();) {
  54                 boot_item *item = it.Next();
  55
  56                 if (!strcmp(name, item->name)) {
  57                         if (_size != NULL)
  58                                 *_size = item->size;
  59
  60                         return item->data;
  61                 }
  62         }
  63
  64         return NULL;
  65 }
  66
  67
  68 status_t
  69 boot_item_init(void)
  70 {
  71         new(&sItemList) ItemList;
  72                 // static initializers do not work in the kernel,
  73                 // so we have to do it here, manually
  74
  75         return B_OK;
  76 }