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ÆäʵÊǸöÂù¼òµ¥µÄÎÊÌâ¡£ÔÚLDD3µÄµÚ15ÕÂÉÏÓÐд£¨¼û“Remapping Specific I/O Regions”ÕâÒ»½Ú£©¡£²»¹ýµ±Ê±×÷ÕßÑ¡ÔñÁËÒ»¸ö´íÎóµÄ×ö·¨£ºÏȰÑÕâ¿éIO¿Õ¼äÓÃioremapÓ³Éäµ½ÁËÄں˿ռ䣬ȻºóÔÚÓû§½ø³Ì·ÃÎʱ»Ó³ÉäµÄµØÖ·Ëù²ú ÉúµÄȱҳÖжÏÀÓÃvmalloc_to_pageµÃµ½page£¬·µ»Ø¸øÓû§½ø³Ì¡£
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static int filter_mmap(struct file *filp, struct vm_area_struct *vma)
{
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
vma->vm_pgoff = ( (u32)map_start >> PAGE_SHIFT);
if (remap_pfn_range(vma,
vma->vm_start,
vma->vm_pgoff,
vma->vm_end-vma->vm_start,
vma->vm_page_prot))
return -EAGAIN;
return 0;
}


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