US 12,423,223 B2
Access requests to local storage circuitry
Abhishek Raja, Niagara Falls, NY (US)
Assigned to Arm Limited, Cambridge (GB)
Filed by Arm Limited, Cambridge (GB)
Filed on Sep. 29, 2023, as Appl. No. 18/477,625.
Prior Publication US 2025/0110863 A1, Apr. 3, 2025
Int. Cl. G06F 12/00 (2006.01); G06F 12/02 (2006.01)
CPC G06F 12/023 (2013.01) 19 Claims
OG exemplary drawing
 
1. An apparatus comprising:
memory access circuitry responsive to one or more types of memory access request, to retrieve data items specified in the one or more types of memory access request from memory;
local storage circuitry configured to store at least some of the retrieved data items, wherein the local storage circuitry is N-way associative, and N is greater than 1; and
control circuitry responsive to an indication that an access request signalled to the local storage circuitry relating to an accessed data item corresponds to a predefined type of memory access request, to implement a restrictive access policy in relation to the accessed data item in the local storage circuitry, wherein the restrictive access policy excludes at least one step of accessing an excluded subset of ways of the local storage circuitry, wherein:
the predefined type of memory access request is generated based on a predefined type of memory access instruction; and
the apparatus comprises decoder circuitry responsive to receipt of the predefined type of memory access instruction to signal the indication to the control circuitry.