申論題

1. Assume a 32-bit, byte-addressed machine with virtual addressing. The two high-order bits are 11 is treated as unmapped. These addresses are only accessible by the operating system and bypass virtual address translation. The answers need to express as a multiple of a power of 2, or in terms of KB, MB, GB, or TB as appropriate.

1.5 Assuming a two-level page table where half the bits of the virtual page number are used to index the first level, and the other half are used to index the second level, how many second-level page tables can a process use if its total page table size is limited to 400KB?