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Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
September 2006 DM
Order Number: 252480-006US 71
Intel XScale
®
Processor—Intel
®
IXP42X product line and IXC1100 control plane processors
MACRO ALLOCATE Rx
MCR P15, 0, Rx, C7, C2, 5
ENDM
MACRO DRAIN
MCR P15, 0, R0, C7, C10, 4 ; drain pending loads and stores
ENDM
DRAIN
MOV R4, #0x0
MOV R5, #0x0
MOV R2, #0x1
MCR P15,0,R2,C9,C2,0 ; Put the data cache in lock mode
CPWAIT
MOV R0, #16
LOOP1:
ALLOCATE R1 ; Allocate and lock a tag into the data cache at
; address [R1].
; initialize 32 bytes of newly allocated line
DRAIN
STRD R4, [R1],#8 ;
STRD R4, [R1],#8 ;
STRD R4, [R1],#8 ;
STRD R4, [R1],#8 ;
SUBS R0, R0, #1 ; Decrement loop count
BNE LOOP1
; Turn off data cache locking
DRAIN ; Finish all pending operations
MOV R2, #0x0
MCR P15,0,R2,C9,C2,0; Take the data cache out of lock mode.
CPWAIT
Example 11. Creating Data RAM