| US 7,543,127 B2 | ||
| Computer system | ||
| Masao Kajihara, Tokyo (Japan) | ||
| Assigned to Nokia Corporation, Espoo (Finland) | ||
| Filed on Jan. 24, 2006, as Appl. No. 11/339,095. | ||
| Claims priority of application No. 2005-021482 (JP), filed on Jan. 28, 2005. | ||
| Prior Publication US 2006/0174079 A1, Aug. 03, 2006 | ||
| Int. Cl. G06F 12/00 (2006.01) | ||
| U.S. Cl. 711—163 [711/118; 711/123; 711/125; 711/170; 711/173] | 24 Claims |
| 1. A computer system comprising:
a processor comprising a first working mode, and a second working mode having a different privilege level from said first
working mode;
a first instruction cache memory area configurable to store program instructions read from main memory and that is accessed
by said processor during said first working mode, where the instructions stored in the first instruction cache are the same
as instructions stored in the main memory;
a second instruction cache memory area configurable to store program instructions read from main memory and that is accessed
by said processor during said second working mode, where the instructions stored in the second instruction cache are the same
as instructions in the main memory; and
circuitry configurable to respond to a current working mode to automatically select one of said first instruction cache memory
area or said second instruction cache memory area to provide program instructions to be executed by said processor.
|