blob: 4579fdcb8f69d92712a4c7ca75b0172949c98ea8 [file] [log] [blame] [edit]
;/*******************************************************************************
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;* This software is supplied by Renesas Electronics Corporation and is only
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;* Copyright (C) 2012 Renesas Electronics Corporation. All rights reserved.
;*******************************************************************************/
;/*******************************************************************************
;* File Name : l1_cache_init.s
;* Version : 0.01
;* Device(s) : Aragon
;* Tool-Chain : DS-5 Ver 5.8
;* ARM Complier
;* :
;* H/W Platform : Aragon CPU Board
;* Description : Aragon Sample Program vecotr.s
;*******************************************************************************/
;/*******************************************************************************
;* History : DD.MM.YYYY Version Description
;* : 23.05.2012 0.01
;*******************************************************************************/
;==================================================================
; This code provides basic global enable for Cortex-A9 cache.
; It also enables branch prediction
; This code must be run from a privileged mode
;==================================================================
AREA INITCA9CACHE, CODE, READONLY
EXPORT L1CacheInit
L1CacheInit FUNCTION
;==================================================================
; Enable caches
; Caches are controlled by the System Control Register:
;==================================================================
;;; I-cache is controlled by bit 12
;;; D-cache is controlled by bit 2
MRC p15, 0, r0, c1, c0, 0 ;;; Read CP15 register 1
ORR r0, r0, #(0x1 << 12) ;;; Enable I Cache
ORR r0, r0, #(0x1 << 2) ;;; Enable D Cache
MCR p15, 0, r0, c1, c0, 0 ;;; Write CP15 register 1
;==================================================================
; Enable Program Flow Prediction
;
; Branch prediction is controlled by the System Control Register:
; Set Bit 11 to enable branch prediction and return
;==================================================================
;;; Turning on branch prediction requires a general enable
;;; CP15, c1. Control Register
;;; Bit 11 [Z] bit Program flow prediction:
;;; 0 = Program flow prediction disabled
;;; 1 = Program flow prediction enabled.
MRC p15, 0, r0, c1, c0, 0 ;;; Read System Control Register
ORR r0, r0, #(0x1 << 11)
MCR p15, 0, r0, c1, c0, 0 ;;; Write System Control Register
;==================================================================
; Enable D-side prefetch
;==================================================================
;;; Bit 2 [DP] Dside prefetch:
;;; 0 = Dside prefetch disabled
;;; 1 = Dside prefetch enabled.
MRC p15, 0, r0, c1, c0, 1 ;;; Read Auxiliary Control Register
ORR r0, r0, #(0x1 << 2) ;;; Enable Dside prefetch
MCR p15, 0, r0, c1, c0, 1 ;;; Write Auxiliary Control Register
BX lr
ENDFUNC
END