player/Project/Src/NES/cart.s

	INCLUDE equates.s

	
	IMPORT NES_RAM
	IMPORT NES_SRAM	
	IMPORT CPU_reset
	IMPORT romfile ;from main.c
	IMPORT cpu_data	   ; 6502.s	
	IMPORT op_table
		
	EXPORT cpu6502_init
	EXPORT map67_
	EXPORT map89_
	EXPORT mapAB_
	EXPORT mapCD_
	EXPORT mapEF_
;----------------------------------------------------------------------------
 AREA rom_code, CODE, READONLY
;	THUMB
   PRESERVE8   
;----------------------------------------------------------------------------
cpu6502_init PROC
;----------------------------------------------------------------------------
	stmfd sp!,{r4-r11,lr}
		
    ldr r10,=cpu_data	;<3B><>ȡ<EFBFBD><C8A1>ַ
	ldr r11,=NES_RAM	;r11=cpu_zpage
	
        ldr r11,[r11]       ;NES_RAM<41><4D><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8> 
;*******************************************************		
		str r11,memmap_tbl             ;NES_RAM<41><4D><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>
		str r11,memmap_tbl+4
		str r11,memmap_tbl+8
  
		ldr r0,=NES_SRAM              ;NES_SRAM<41><4D><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>
		ldr r0,[r0]
		str r0,memmap_tbl+12
;**********************************************************************			
		
	ldr r0,=op_table   ;<3B><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA><EFBFBD><EFBFBD>ַ
	str r0,opz         ;<3B><><EFBFBD><EFBFBD>

	ldr r0,=romfile		 
	ldr r0,[r0]			 ;R0<52><30><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>ROMӳ<4D>񣨰<EFBFBD><F1A3A8B0><EFBFBD>ͷ<EFBFBD><CDB7>
	add r3,r0,#16		;r3<72><33><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>rom<6F><6D><EFBFBD><EFBFBD>(<28><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><CDB7>
	str r3,rombase		;<3B><><EFBFBD><EFBFBD>rom<6F><6D><EFBFBD><EFBFBD>ַ
						;r3=rombase til end of loadcart so DON'T FUCK IT UP
	mov r2,#1
	ldrb r1,[r3,#-12]	; 16kB PROM<4F><4D><EFBFBD><EFBFBD>Ŀ  	 2
	rsb r0,r2,r1,lsl#14	 ;romsize=X*16KB	 <<14 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>	 r0=0x7fff
	str r0,rommask		;rommask=promsize-1	 32768-1	
;------------------------------------------------------------------------------------	
	mov r9,#0		;(<28><><EFBFBD><EFBFBD><EFBFBD>κ<EFBFBD>encodePC<50><43>ӳ<EFBFBD><D3B3><EFBFBD><EFBFBD>*<2A><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еĴ<D0B5><C4B4><EFBFBD>)
	str r9,lastbank		;6502PC<50><43> ROM<4F><4D><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƫ<EFBFBD><C6AB><EFBFBD><EFBFBD>д0

	mov r0,#0			;Ĭ<><C4AC>romӳ<6D><D3B3>
	bl map89AB_			;89AB=1st 16k
	mov r0,#-1
	bl mapCDEF_			;CDEF=last 16k
;----------------------------------------------------------------------------

    ldrb r1,[r3,#-10]		;get mapper#
	ldrb r2,[r3,#-9]
	tst r2,#0x0e			;long live DiskDude!
	and r1,r1,#0xf0
	and r2,r2,#0xf0
	orr r0,r2,r1,lsr#4
	movne r0,r1,lsr#4		;ignore high nibble if header looks bad	<09><><EFBFBD>Ը<EFBFBD><D4B8><EFBFBD>λ<EFBFBD><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><CDB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
                            ;r0=mapper<65><72>
;----------------------------------------------------------------------------	
    
	ldr r0,=Mapper_W
	str r0,writemem_tbl+16
	str r0,writemem_tbl+20
	str r0,writemem_tbl+24
	str r0,writemem_tbl+28
;------------------------------------------------------------------------------

	bl CPU_reset		;reset everything else
	ldmfd sp!,{r4-r11,lr}
	bx lr
	ENDP

;----------------------------------------------------------------------------
map67_	;rom paging.. r0=page#
;----------------------------------------------------------------------------
	ldr r1,rommask
	and r0,r1,r0,lsl#13
	ldr r1,rombase
	add r0,r1,r0
	sub r0,r0,#0x6000
	str r0,memmap_tbl+12
	b flush
;----------------------------------------------------------------------------
map89_	;rom paging.. r0=page# ROM<4F><4D>ҳ
;----------------------------------------------------------------------------
	ldr r1,rombase			 ;rom<6F><6D>ʼ<EFBFBD><CABC>ַ
	sub r1,r1,#0x8000
	ldr r2,rommask
	and r0,r2,r0,lsl#13
	add r0,r1,r0
	str r0,memmap_tbl+16
	b flush
;----------------------------------------------------------------------------
mapAB_
;----------------------------------------------------------------------------
	ldr r1,rombase
	sub r1,r1,#0xa000
	ldr r2,rommask
	and r0,r2,r0,lsl#13
	add r0,r1,r0
	str r0,memmap_tbl+20
	b flush
;----------------------------------------------------------------------------
mapCD_
;----------------------------------------------------------------------------
	ldr r1,rombase
	sub r1,r1,#0xc000
	ldr r2,rommask
	and r0,r2,r0,lsl#13
	add r0,r1,r0
	str r0,memmap_tbl+24
	b flush
;----------------------------------------------------------------------------
mapEF_
;----------------------------------------------------------------------------
	ldr r1,rombase
	sub r1,r1,#0xe000
	ldr r2,rommask
	and r0,r2,r0,lsl#13
	add r0,r1,r0
	str r0,memmap_tbl+28
	b flush
;----------------------------------------------------------------------------
map89AB_
;----------------------------------------------------------------------------
	ldr r1,rombase		   ;rom<6F><6D><EFBFBD><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><CDB7>
	sub r1,r1,#0x8000
	ldr r2,rommask
	and r0,r2,r0,lsl#14
	add r0,r1,r0
	str r0,memmap_tbl+16
	str r0,memmap_tbl+20
flush		;update m6502_pc & lastbank
	ldr r1,lastbank
	sub r9,r9,r1
	and r1,r9,#0xE000	   ;//r9<72><39>0xe000<30><30>λ<EFBFBD><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	adr r2,memmap_tbl		   ;//<2F>Ѵ洢<D1B4><E6B4A2>ӳ<EFBFBD><D3B3><EFBFBD><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD>ص<EFBFBD>r2
	lsr r1,r1,#11				;//>>11λ	  r1/2048
	ldr r0,[r2,r1]				;//<2F><>ȡr2<72><32>ַ+r1ƫ<31>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD>ݵ<EFBFBD>r0

	str r0,lastbank				;//<2F><><EFBFBD><EFBFBD>6502PC<50><43> ROM<4F><4D><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƫ<EFBFBD><C6AB><EFBFBD><EFBFBD> 
	add r9,r9,r0	;//m6502_pc+r0
	orr lr,#0x01		;lr<6C><72><EFBFBD><EFBFBD>λ<EFBFBD><CEBB>1<EFBFBD><31>ֹ<EFBFBD><D6B9><EFBFBD><EFBFBD>arm״̬
	bx lr

;----------------------------------------------------------------------------
mapCDEF_
;----------------------------------------------------------------------------
	ldr r1,rombase
	sub r1,r1,#0xc000
	ldr r2,rommask
	and r0,r2,r0,lsl#14
	add r0,r1,r0
	str r0,memmap_tbl+24
	str r0,memmap_tbl+28
	b flush
;----------------------------------------------------------------------------
map89ABCDEF_
;----------------------------------------------------------------------------
	ldr r1,rombase
	sub r1,r1,#0x8000
	ldr r2,rommask
	and r0,r2,r0,lsl#15
	add r0,r1,r0
	str r0,memmap_tbl+16
	str r0,memmap_tbl+20
	str r0,memmap_tbl+24
	str r0,memmap_tbl+28
	b flush
;*************************************************************************************
     IMPORT asm_Mapper_Write;
Mapper_W	
;-------------------------------------------
	stmfd sp!,{r3,lr}	;LR <20>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD>ջ
	mov r1,r12
	bl asm_Mapper_Write
	ldmfd sp!,{r3,lr}
	orr lr,#0x01		;lr<6C><72><EFBFBD><EFBFBD>λ<EFBFBD><CEBB>1<EFBFBD><31>ֹ<EFBFBD><D6B9><EFBFBD><EFBFBD>arm״̬
	bx lr
;	nop
;---------------------------------------------------------------------------------------

    END