LECTURE NINE 8086 MICROPROCESSOR MEMORY AND I/O INTERFACINGdoi:10.13140/RG.2.2.36406.86085Hadeel Abdullah
4.1.4 80286 Registers The 80286 microprocessor adds one major programmer-visible feature to the 8086 – protected mode operation. This text will not cover the 80286 protected mode of operation for a variety of reasons. First, the protected mode of the 80286 was poorly designed. Sec- ond, it...
Given the frequency that device drivers may perform a virtual-to-physical-address translation for data payload, the system is often configured to have a simple mapping between the virtual and physical address for kernel space. This could be either a 1:1 mapping or, as in the case of Linux,...
The memory management unit includes hardware for paging and provides memory mapping facilities for the TLB. Presuming that the TLB is correctly mapped so that it holds lookup data for the correct page of target memory, the target instruction pointer value is translated to the physical address of ...
U.S. Pat. No. 5,644,541, to Siu et. al., describes a memory system comprising a plurality of semiconductor memories with some bad bits, a substitution memory and a mapping logic to redirect accesses to bad-bit locations in the semiconductor memories to good storage cells within the substi...
(32). Each time the operating system switches tasks, it can reload CR3 so that it points to the page directory for the new program. The process of mapping a virtual address into a physical address is performed within the processor. Memory caching techniques ensure that frequently used page ...