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| /freebsd-11-stable/sys/arm/arm/ | ||
| H A D | pmap-v4.c | diff 183836 Mon Oct 13 16:49:13 MDT 2008 raj Do not use cached page for temporary mapping in pmap_zero_page_generic() The physical page which we clear is accessed via additional temp kernel mapping for the period of zeroing operation. However in systems with virtual d-cache (most ARMs) when write-allocate feature is enabled, we can have modified but unflushed content pertaining to this physical page still in the d-cache due to its primary (pre-existing) mapping. In such scenario that cached content upon flush is likely to overwrite [portions of] the physical page we want to zero here.. This is a general problem with multiple virtual mappings covering the same physical page with write-allocate and virtual d-cache: there is inherent potential for corruptions of this kind, which are not easily resolved; it is best policy that such multiple mappings be not allowed. Obtained from: Marvell, Semihalf |
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