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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·£¬sizeÊÇÒªÊÍ·Å¿Õ¼äµÄ´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´¿´¿´ËüµÄ¾ßÌåÄÚÈÝ°É¡£
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;//¼ÆËã³öÒªÊÍ·Å¿Õ¼äµÄ½áÊøλÖÃÏà¶ÔÓÚ¸ÃÄÚ´æ½ÚµãµÄÆðʼλÖõÄÆ«ÒÆÒ³Êý¡£
unsigned long end = (addr + size)/PAGE_SIZE;//ÊÍ·Å¿Õ¼ä×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»°£¬ÆäʵÕæÕýÔÚ0ºÅÒ³µÄλÖ㬵«ÊÇÈç¹ûͨ¹ýÉÏÃæµÄÔËË㣬Çó³öÀ´µÄ¾ÍÊÇ1ºÅÒ³µÄλÖá£ÎªÊ²Ã´ÕâÑù×öÄØ£¿ÒòΪÈç¹ûÆðʼµØÖ·²»ÊÇ°´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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spawn ftp [lindex $argv 0]
expect "Name(*):"
send "ftp\r"
expect "Password:*"
send "hell05a\r"
expect "ftp> ......
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