inittcm.s

realview22.rar

;;  Copyright ARM Ltd 2002. All rights reserved.
;;
;;  This code initialises the TCMs before calling __main
;;  this allows scatter loading to relocate code into the TCMs
;;
;;  This code must be run from a privileged mode



; --- Standard definitions of mode bits and interrupt (I & F) flags in PSRs

Mode_USR        EQU     0x10
Mode_FIQ        EQU     0x11
Mode_IRQ        EQU     0x12
Mode_SVC        EQU     0x13
Mode_ABT        EQU     0x17
Mode_UND        EQU     0x1B
Mode_SYS        EQU     0x1F ; available on ARM Arch 4 and later

I_Bit           EQU     0x80 ; when I bit is set, IRQ is disabled
F_Bit           EQU     0x40 ; when F bit is set, FIQ is disabled

        EXPORT InitTCM

        AREA   INIT966TCM, CODE, READONLY

        ENTRY

InitTCM FUNCTION        

        IMPORT  ||Image$$STACKS$$ZI$$Limit||               ; defined by linker and located by scatter file
        LDR     SP, =||Image$$STACKS$$ZI$$Limit||


;
;Next block sets the TCMs base and size registers to their actual size
;Note actual size should be contained in the register by default.
;
;
;;TCM Configuration
;==================
;
; Set global core configurations
;===============================
;
        MRC     p15, 0, r0, c1, c0, 0       ; read CP15 register 1 into r0
       
 IF :DEF: TCM
        ORR     r0, r0, #(0x1 <<12)         ; enable I-TCM
        ORR     r0, r0, #(0x1 <<2)          ; enable D-TCM 
 ELSE 
        BIC     r0, r0, #(0x1 <<12)         ; Don't enable I-TCM
        BIC     r0, r0, #(0x1 <<2)          ; Don't enable D-TCM 
 ENDIF        


        MCR     p15, 0, r0, c1, c0, 0       ; write cp15 register 1
;
;
        IMPORT  __main

; --- Now enter the C code
        B       __main                      ; note use B not BL, because an application will never return this way

        ENDFUNC

        END