Method for improving controllability in data processing equipment with translation-look-aside-buffer (TLB)

摘要

When user pages marked as write-protected in a translation memory are write-accessed, leading to an interrupt request, not only the corresponding page entry in the look-up table is checked, but also whether the access has system privileges. If that is the case, write protection is temporarily lifted until the mode of operation changes again from system to user. For write protection to be re-established, control bits are used as indicators, on the basis of which translation table entries concerned by system accesses can be declared invalid.