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Typical use of CR3 in address translation with 4 KiB pages. Used when virtual addressing is enabled, hence when the PG bit is set in CR0. CR3 enables the processor to translate linear addresses into physical addresses by locating the page directory and page tables for the current task.
Firstly, the page table walker, which uses physical addresses to access the page table and directory, can now access physical addresses greater than the 32-bit physical addresses supported in systems without PAE. From CR3, the page table walker can access page directories and tables that are beyond the 32-bit range. Secondly, the physical ...
Local enable for breakpoint #3. 7: G3: Global enable for breakpoint #3. 8: LE (386 only) Local Exact Breakpoint Enable. [a] 9: GE (386 only) Global Exact Breakpoint Enable. [a] 10 — Reserved, read-only, read as 1 and should be written as 1. 11: RTM (Processors with Intel TSX only) Enable advanced debugging of RTM transactions (only if ...
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.
A hardware page table walker can treat the additional translation layer almost like adding levels to the page table. Using SLAT and multilevel page tables, the number of levels needed to be walked to find the translation doubles when the guest-physical address is the same size as the guest-virtual address and the same size pages are used.
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.
Moves to the CR3 control register are serializing and will flush the TLB. [l] On Pentium and later processors, moves to the CR0 and CR4 control registers are also serializing. [m] MOV reg,DRx: 0F 21 /r [j] Move from x86 debug register to general register. [k] MOV DRx,reg: 0F 23 /r [j] Move from general register to x86 debug register. [k]
The theoretically optimal page replacement algorithm (also known as OPT, clairvoyant replacement algorithm, or Bélády's optimal page replacement policy) [3] [4] [2] is an algorithm that works as follows: when a page needs to be swapped in, the operating system swaps out the page whose next use will occur farthest in the future. For example, a ...