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  free_bootmem()Õâ¸öº¯ÊýÊÇϵͳÆô¶¯³õÆÚÄÚ´æÊͷŵĺËÐĺ¯Êý£¬ÎÒÃÇÀ´¿´¿´ËüµÄ´úÂë¡£
  void __init free_bootmem (unsigned long addr, unsigned long size)//addrÊÇÒªÊͷŵÄÎïÀíÆðʼµØÖ·£¬sizeÊÇÒªÊͷſռäµÄ´óС¡£
 {
    free_bootmem_core(NODE_DATA(0)->bdata, addr, size);//Ö±½Ó´ÓÄÚ´ænode0ºÅ¿ªÊ¼ÊÍ·ÅÄÚ´æ¿Õ¼ä¡£
 }//¿ÉÒÔ¿´³öÕæÕýµÄºËÐĺ¯ÊýÊÇfree_bootmem_core()Õâ¸öº¯Êý£¬Õâ¸ö²ÅÊǺËÐIJ¿·Ö¡£ÎÒÃÇÀ´¿´¿´ËüµÄ¾ßÌåÄÚÈݰɡ£
  static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr, unsigned long size)
{
    unsigned long i;
    unsigned long start;
    /*
     * round down end of usable mem, partially free pages are
     * considered reserved.
     */
    unsigned long sidx;
    unsigned long eidx = (addr + size - bdata->node_boot_start)/PAGE_SIZE;//¼ÆËã³öÒªÊͷſռäµÄ½áÊøÎ»ÖÃÏà¶ÔÓÚ¸ÃÄÚ´æ½ÚµãµÄÆðʼλÖÃµÄÆ«ÒÆÒ³Êý¡£
    unsigned long end = (addr + size)/PAGE_SIZE;//Êͷſռä×îºóλÖõľø¶ÔÒ³ºÅ¡£
    BUG_ON(!size);//Èç¹ûÊÍ·Å¿ÕÄڴ棬ϵͳ±ÀÀ£¡£
    BUG_ON(end > bdata->node_low_pfn);//²»ÄÜÊͷų¬¹ý±¾½Úµã·¶Î§ÄÚµÄÄÚ´æ¿Õ¼ä£¬·ñÔòϵͳ±ÀÀ£¡£
    if (addr < bdata->last_success)
             bdata->last_success = addr;
    /*
     * Round up the beginning of the address.
     */
    start = (addr + PAGE_SIZE-1) / PAGE_SIZE;//ÕâÀï¼ÆË㿪ʼµØÖ·µÄÈ«ÐÂÒ³£¬¼ÙÉèaddrÊÇÔÚ0~4kbµÄµØÖ··¶Î§µÄ»°£¬ÆäÊµÕæÕýÔÚ0ºÅÒ³µÄλÖ㬵«ÊÇÈç¹ûͨ¹ýÉÏÃæµÄÔËË㣬Çó³öÀ´µÄ¾ÍÊÇ1ºÅÒ³µÄλÖá£ÎªÊ²Ã´ÕâÑù×öÄØ£¿ÒòΪÈç¹ûÆðʼµØÖ·²»Êǰ´Ò³¶ÔÆëµÄ£¬Èç¹ûÖ±½ÓÊÍ·Å£¬¾Í»á°ÑÇ°Ãæ²»ÊôÓÚÕâ¸öÄÚ´ænodeµÄ¿Õ¼äÒ²ÊÍ·ÅÁË¡£
    sidx = start - (bdata->node_boot_start/PAGE_SIZE);//Õâ¸ö¾ÍÊǼÆËãÐÂÒ³ºÍÔ­À´µÄÆðʼµØÖ·ËùÔÚÒ³µÄÆ«ÒÆÒ³Êý¡£
 


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