;************************************************************************************************;Beijing instittue of technology;File Name:		Init.s;Description:		Init.;Author:			chaisc;Date:			200312-1;SDRAM Configuration:	Use ljg.txt,SDRAM remap to address 0x0~0x100,0000(16MB) ;************************************************************************************************		GET	mem.a	GET	casia1.a	IMPORT main_entry	CODE32	AREA    Init,CODE,READONLY	ENTRY 	B       Reset_Handler		        	NOP         	
	NOP                	NOP       
        	NOP       	NOP         	NOP               	NOP       Reset_Handler	;******************************************************	;mask all interrupt;******************************************************	LDR	R1,=0x3ff0000	LDR	R0,=0xE7ffff90         STR	R0,[R1]
	LDR	r0, =0x3FF0000 + 0x3010	LDR	r1, =rEXTDBWTH  	LDR	r2, =rROMCON0    	LDR	r3, =rROMCON1	LDR	r4, =rROMCON2	LDR	r5, =rROMCON3	LDR	r6, =rROMCON4	LDR	r7, =rROMCON5	LDR	r8, =0x14010380	LDR	r9, =rSDRAMCON1	LDR	r10,=rSDRAMCON2	LDR	r11,=rSDRAMCON3	LDR	r12,=rSREFEXTCON	STMIA	r0, {r1-r12}	    	ldr	r0, =0x0	ldr	r1, =0x200000			ldr	r2, =0x400000rom2ram_copy_loop	ldr	r3, [r0], #4	str	r3, [r2], #4	subs	r1, r1, #4	bne	rom2ram_copy_loop        	LDR	r0, =0x3FF0000 + 0x3010	LDR	r1, =0x00003002  	LDR	r2, =0x12040060   	LDR	r3, =rROMCON1	LDR	r4, =rROMCON2	LDR	r5, =rROMCON3	LDR	r6, =rROMCON4	LDR	r7, =rROMCON5	LDR	r8, =0x10000380	LDR	r9, =rSDRAMCON1	LDR	r10,=rSDRAMCON2	LDR	r11,=rSDRAMCON3	LDR	r12,=rSREFEXTCON	STMIA	r0, {r1-r12}         LDR    	R1,=0x3ff5000         LDR	R0,=0x0         STR	R0,[R1]         LDR    	R0,=0x3ff5008                 LDR    	R1,[R0]         AND    	R1,R1,#0x08         CMP    	R1,#0x08         BNE    	Next         LDR    	R0,=0x10000
         MOV    	PC,R0
Next	;********************************************************;Initialise system stack for different processor modes
;;Change to Interrupt Mode (IRQ);********************************************************	mov	r0, #0x12	MSR	cpsr_c, r0	mov 	sp,#0x70000
;********************************************************
;Change to Fast Interrupt Mode (FIQ)
;********************************************************	mov	r0,#0x11	MSR	cpsr_c, r0					mov 	sp,#0x7f000
;********************************************************
;Change to Supervisor Mode (SVC)
;********************************************************         mov	r0,#0x13	MSR	cpsr_c, r0					mov 	sp,#0x80000	         LDR	R1,=0x3FF4000	LDR	R0,=0x0         STR	R0,[R1] *********************************************************
	IMPORT  	C_Entry    	BL      	C_Entry	B  	.	   	END