612 cache alias

Cache alias problems:

L1cache: vipt type;

32 K, (S, E, B) = (256, 4, 32)

Way-size = 8kb

Assume that the tlbsize is 4 kb and there are two address ing relationships:

Va0: 0x0000_0020-> PA 0x0000_0020

Va1: 0x0000_1020-> PA 0x0000_0020

We can obtain that the index of va0 is 1, and the index of va1 is 129. If this is set to cold cache, PA data enters index1 when accessing va0, and PA data enters index129 again when accessing va1, therefore, the cache contains two copies of data with the same physical address, which generates the cache alias.

Cache alias will appear in vept and way-size> page-size. For sep612, this is a problem that must be solved. Write it again.