edit bios.txt

MIPS32指令系统的汇编器。 在QUARTUS仿真环境中

DATa SEG 
	ORG_DATA 0000h
	BUF Dw 00000055h ,100000AAh 
DATA ENDS 
CODE SEG  
ORG_CODE    0000H 
                 J    0C00H 
ORG_CODE    0C00H 
                 ADDI    $sp ,$zero ,0FFFh 
                 ADDI    $t0 ,$zero ,0 
                 ADDI    $t1 ,$zero ,0FFFFh  
                 ADDI    $t2 ,$zero ,55AAh 
                 ADDI    $t3 ,$zero ,0AA55h 
                 ADDI    $s0 ,$zero ,0E1h 
CHKRAM : LW         $t8 ,0000h ($t0) 
                SW         $t2 ,0000h ($t0) 
                LW         $t4 ,0 ($t0) 
                BNE       $t4 ,$t2 ,ERROR 
                SW         $t3 ,0 ($t0) 
                LW         $t4 ,0 ($t0) 
                BNE       $t4 ,$t2 ,ERROR 
                SW         $t8 ,0 ($t0) 
                BEQ       $t0 ,$t1 ,CHKKEY 
                ADDI     $t0 ,$zero ,4 
                J             CHKRAM 
CHKKEY:ADDI       $s0 ,$zero ,0E1 
               LW          $t0 ,FF12h ($0) 
               ANDI      $t0 ,$t0 ,1 
               BNE        $t0 ,$zero ,ERROR 
CHKLED:ANDI      $t0 ,$zero ,0 
               ADDI      $t1 ,$zero ,0AAAA 
DIPS:      ADDI      $t2 ,$zero ,0FFFFFFh 
               SW          $t0 ,0FF00h ($zero) 
LOP:       SUBI        $t2 ,$t2 ,1 
               BNE        $t2 ,$zero ,LOP 
               ADDI      $t0 ,$t0,1111 
               BNE        $t0 ,$t1,DISPS 
               J             0004 
ERROR:   SW         $s0 ,0FF00h ($zero) 
LP:          SW         $t9 ,FF50h ($zero)  
               J             LP 

CODE ENDS