Emulating the memory functions of a first system on a second sys

Details Emulating the memory functions of a first system on a second sys Emulating the memory functions of a first system on a second sys

1993-09-28

1996-05-07

Teska, Kevin J.

Boots, shoes, and leggings

3642323, 3642543, 3642566, 364280, 3642817, 3642818, 364DIG1, G06F 9455, G06F 1500

Patent

active

055155251

ABSTRACT:
A memory translation mechanism and method executing in a second system to perform first system memory operations for first system executive and user tasks executing on the second system which includes a second system memory organized as a plurality of memory segments, wherein first memory segments are designated to correspond to system memory areas and second memory segments are designated to correspond to user memory areas, and wherein each memory segment corresponds to a combination of a type of first system task and a type of a first system memory area. An interpreter maps by reading an identification of the type of the task corresponding to the first system virtual address from the task type memory and the area type value from the first system virtual address and determining a memory segment corresponding to the type of the first system task and the type of first system area referenced by the first system virtual address. The interpreter maps the identified segment to a memory pool identifier wherein each memory pool identifier corresponds to a task. The second system includes a plurality of pseudo device drivers corresponding to first system input/output devices. Each pseudo device driver includes a segment mapping mechanism which includes a segment pool for storing entries relating memory pool identifiers and providing a corresponding base address identifying the location of the corresponding memory segment in the second system memory.

REFERENCES:
patent: 4868738 (1989-09-01), Kish et al.
patent: 4926322 (1990-05-01), Stimac et al.
patent: 5230069 (1993-07-01), Brelsford et al.
patent: 5349661 (1994-09-01), Brewer et al.
"HP 3000 Emulation on HP Precision Architecture Computers", by Arndt B. Bergh, et al., Dec., 1987, Hewlett-Packard Journal, pp. 87-89.

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