| 摘要 |
The present invention provides a memory protective administrative apparatus for a computer for protecting memory access between programs. A virtual address administrative apparatus constituting the first mentioned apparatus receives size of a memory region prepared, and assigns a virtual address region larger than the size. At this time, a top address of a region smaller than size S1 covered by 1-entry of the minimum segment table performs virtual address assigning so as to be aligned to the size S1. In a region of size larger than the S1, hierarchies in which the size can be covered by 1-entry are searched from bottom, and likewise, a virtual address aligned is assigned. A page table is variable in length and has a page entry for a size part. The page table is linked to entry corresponding to the top virtual address of a segment table of a hierarchy used for alignment.
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