A storage management method for a microprocessor

Abstract

Disclosed is a microprocessor storage management method: whenever a process references a logic address, a storage management unit searches in a cache index storage cell and automatically looks up in a "quick table" first; if the logic address is found, a cache address on the chip is translated; if the logic address is not found, an address translation operation is executed; a page frame number is added to last 13 bits of the logic address to obtain a physical address; if the address is in a range of a multitask protection start address register to a multitask protection end address register, virtual address translation is successful; and if the address is not in a range of the start address register to the end address register, a microprocessor generates an address translation out-of-range exception. A novel microprocessor storage management method is provided by the present invention, and translation speed of a logic address to a physical address is accelerated. The operating system can prevent illegal accesses of user programs by arranging the multitask protection start address register and the multitask protection end address register.

Description

technical field [0001] The invention relates to a storage management method for a microprocessor. Background technique [0002] Virtual memory technology is an abstract description of the entire memory, which can be understood as the sum of virtual addresses provided by the processor for user programs. Compared with physical memory, it does not "real" exist because modern operating systems provide An abstraction of memory management, namely virtual memory. The process uses the address in virtual memory, and the operating system assists the relevant hardware to "convert" it into a real physical address. With such an abstraction, a process can use a much larger address space than the real physical address, and even multiple processes can use the same address. [0003] The main memory of real computer equipment is limited, and the process can have a huge logical address through the storage management unit. Logical address refers to the address of an operand or an instruction...

AI Technical Summary

Problems solved by technology

Most CPUs use paging storage management, and the logical address used by the program needs to be converted into a physical address, and a large number of CPU clock cycles will be spent in the conversion from logical address to physical address