Several memory systems are supported in the specification. Physical-only is suited to the simplest embedded systems. There are also three UNIX-style virtual memory systems for memory cached in mass-storage systems. The virtual memory systems support MMU with three sizes, with addresses sized 32, 39 and 48 bits. All virtual memory systems support 4 KiB pages, multilevel page-table trees and use very similar algorithms to walk the page table trees. All are designed for either hardware or software page-table walking. To optionally reduce the cost of page table walks, super-sized pages may be leaf pages in higher levels of a system's page table tree. SV32 has a two-layer page table tree and supports 4 MiB superpages. SV39 has a three level page table, and supports 2 MiB superpages and 1 GiB gigapages. SV48 is required to support SV39. It also has a 4-level page table and supports 2 MiB superpages, 1 GiB gigapages, and 512 GiB terapages. Superpages are aligned on the page boundaries for the next-lowest size of page.[2]
Scaricare Infrastructure Design Suite 2010 Keygen 64 Bits Italiano
2ff7e9595c
コメント