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Intel 5-level paging, referred to simply as 5-level paging in Intel documents, is a processor extension for the x86-64 line of processors. [1]: 11 It extends the size of virtual addresses from 48 bits to 57 bits by adding an additional level to x86-64's multilevel page tables, increasing the addressable virtual memory from 256 TiB to 128 PiB.
For some processors, a mode can be enabled with a fifth table, the 512-entry page-map level 5 table; this means that 57 bits of virtual page number are translated, giving a virtual address space of up to 128 PB. [10]: 141–153 In the page table entries, in the original specification, 40 bits of physical page number are implemented.
See Intel 64 and IA-32 Architectures Software Developer's Manual. 23: CET: Control-flow Enforcement Technology: If set, enables control-flow enforcement technology. [16]: 2–19 24: PKS: Enable Protection Keys for Supervisor-Mode Pages: If set, each supervisor-mode linear address is associated with a protection key when 4-level or 5-level ...
In the Intel white paper (reference 1) I cannot allocate a page where it says that the highest bits must be sign extended. This is probably a result of good rewording, can the page number be added? In the IA-32 Architectures manual, I seem to be too stupid to reach the indicated pages---I guess it is in one of the documents linked on that page.
The page-directory entry with PS set to 0 behaves as without PSE. If newer PSE-36 capability is available on the CPU, as checked using the CPUID instruction, then 4 more bits, in addition to normal 10 bits, are used inside a page-directory entry pointing to a large page. This allows a large page to be located in 36-bit address space.
In computing, protected mode, also called protected virtual address mode, [1] is an operational mode of x86-compatible central processing units (CPUs). It allows system software to use features such as segmentation, virtual memory, paging and safe multi-tasking designed to increase an operating system's control over application software.
It is also helpful to use large pages in the host page tables to reduce the number of levels (e.g., in x86-64, using 2 MB pages removes one level in the page table). Since memory is typically allocated to virtual machines at coarse granularity, using large pages for guest-physical translation is an obvious optimization, reducing the depth of ...
A 68451 MMU, which could be used with the Motorola 68010. A memory management unit (MMU), sometimes called paged memory management unit (PMMU), [1] is a computer hardware unit that examines all memory references on the memory bus, translating these requests, known as virtual memory addresses, into physical addresses in main memory.