What is the trick in pAddress & ~(PAGE_SIZE - 1) to get the page's base address
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by Dbger
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Published on 2010-06-11T15:06:21Z
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2010/06/11
16:52 UTC
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Following function is used to get the page's base address of an address which is inside this page:
void* GetPageAddress(void* pAddress)
{
return (void*)((ULONG_PTR)pAddress & ~(PAGE_SIZE - 1));
}
But I couldn't quite get it, what is the trick it plays here?
Conclusion:
Personally, I think Amardeep's explanation plus Alex B's example are best answers. As Alex B's answer has already been voted up, I would like to accept Amardeep's answer as the official one to highlight it! Thanks you all.
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