Intel IXC1100, IXP42X Example 9. Global Clean Operation

Intel® IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
September 2006 DM
Order Number: 252480-006US 67
Intel XScale® Processor—Intel® IXP42X product line and IXC1100 control plane processors
Example 9. Global Clean Operation
; Global Clean/Invalidate THE DATA CACHE
; R1 contains the virtual address of a region of cacheable memory reserved for
; this clean operation
; R0 is the loop count; Iterate 1024 times which is the number of lines in the
; data cache
;; Macro ALLOCATE performs the line-allocation cache operation on the
;; address specified in register Rx.
;;
MACRO ALLOCATE Rx
MCR P15, 0, Rx, C7, C2, 5
ENDM
MOV R0, #1024
LOOP1:
ALLOCATE R1 ; Allocate a line at the virtual address
; specified by R1.
ADD R1, R1, #32 ; Increment the address in R1 to the next cache line
SUBS R0, R0, #1 ; Decrement loop count
BNE LOOP1
;
;Clean the Mini-data Cache
; Can’t use line-allocate command, so cycle 2KB of unused data through.
; R2 contains the virtual address of a region of cacheable memory reserved for
; cleaning the Mini-data Cache
; R0 is the loop count; Iterate 64 times which is the number of lines in the
; Mini-data Cache.
MOV R0, #64
LOOP2:
LDR R3,[R2],#32 ; Load and increment to next cache line
SUBS R0, R0, #1 ; Decrement loop count
BNE LOOP2
;
; Invalidate the data cache and mini-data cache
MCR P15, 0, R0, C7, C6, 0
;