Blakely, Sokoloff, Taylor & Zafman
Virtual access cache protection bits handling method and apparatus
 A protection update buffer in conjunction with a cache memory that stores data, protection information and data line tags. The protection update buffer also stores cache address tags. By storing cache tags in the protection update buffer, the protection update buffer may alert the cache memory of lines that have had protection bits change. Also, by further storing data protection information in the protection update buffer, it is possible for the protection update buffer to provide correct protection information for cached data. If writing a tag and/or data protection information to the protection update buffer causes an overflow of the protection update buffer, then the associated cache is flushed and the entries of the protection update buffer are cleared. 
Intel Corporation
G G
G06F G06F
inventional inventional
Wen-Hann
Wang