Re: [問卦] HPET可以防止記憶體資料被劫持?消失
※ 引述《qxxrbull (XPEC)》之銘言:
: 看到一篇文章 由某位交大CSIE碩士所撰寫
: 裡面以英文寫到
: "High Precision Event Timer (HPET) is developed by AMD and Microsoft
: which provide hightime resolution to prevent memory hijack for timer."
: 我自己翻譯一下
: 簡單來說 HPET可以防止記憶體資料被劫持?
: 是不是代表HPET這個功能開啟之後對資訊安全有幫助?
: 有這方面的八卦嗎?
八卦是你連wiki都不看嗎
An HPET chip consists of a 64-bit up-counter (main counter) counting at a
frequency of at least 10 MHz, and a set of (at least three, up to 256)
comparators.
Each comparator can generate an interrupt when the least significant bits are
equal to the corresponding bits of the 64-bit main counter value.
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是 memory hijack for timer , 不是 memory hijacked 好嗎....
指的應該是避免因為要取得精確的時間間隔,
必須利用程式跑回圈讀TSC、浪費記憶體的狀況
(其實應該是避免浪費CPU才對....)
----
八卦是 TSC還是比較準
不知道為什麼搞HTPC的一堆人狂推HPET (戰)
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※ 文章網址: https://www.ptt.cc/bbs/Gossiping/M.1487961921.A.125.html
※ 編輯: wahaha99 (61.230.96.227), 02/25/2017 02:45:56
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