Add Lab13(1,2)

richardhyy · May 26, 2021 · 5105165 · 5105165
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diff --git a/Lab13/lab13_1.asm b/Lab13/lab13_1.asm
@@ -0,0 +1,114 @@
+; Lab 13.1 - Interrupt Handler
+; func: Display a string of text ends with 0
+; args: (dh) = line(0~24),	(dl) = column(0~79)
+;       (cl) = color,		ds:si = where the string begins
+
+; ## NOTES 
+; 
+; * `int 7ch` context
+; 
+; AX=0B28  BX=0000  CX=0002  DX=0A0A  SP=0000  BP=0000  SI=0000  DI=023F
+; DS=0B28  ES=0000  SS=0B28  CS=0B2A  IP=0036   NV UP EI PL NZ NA PO NC
+; 0B2A:0036 CD7C          INT     7C
+; -t
+; 
+; AX=0B28  BX=0000  CX=0002  DX=0A0A  SP=FFFA  BP=0000  SI=0000  DI=023F
+; DS=0B28  ES=0000  SS=0B28  CS=0000  IP=0200   NV UP DI PL NZ NA PO NC
+; 0000:0200 56            PUSH    SI
+; 
+; 
+; 
+; * `iret` context
+; AX=0B28  BX=0000  CX=0002  DX=0A0A  SP=FFFA  BP=0000  SI=0000  DI=023F
+; DS=0B28  ES=B800  SS=0B28  CS=0000  IP=0239   NV UP DI PL NZ NA PE NC
+; 0000:0239 CF            IRET
+; -t
+; 
+; AX=0B28  BX=0000  CX=0002  DX=0A0A  SP=0000  BP=0000  SI=0000  DI=023F
+; DS=0B28  ES=B800  SS=0B28  CS=0B2A  IP=0038   NV UP EI PL NZ NA PO NC
+; 0B2A:0038 B8004C        MOV     AX,4C00
+; 
+
+assume cs:code
+data segment
+	db "welcome to masm! ",0
+data ends
+code segment
+start:	; Set Up the Interrupt Handler
+		mov ax,cs
+		mov ds,ax
+		mov si,offset do0
+		mov ax,0
+		mov es,ax
+		mov di,200h
+		
+		mov cx,offset do0end-offset do0
+		cld
+		rep movsb
+		
+		; Set Interrupt Vector Table
+		mov ax,0
+		mov es,ax
+		mov word ptr es:[7ch*4],200h	; offset
+		mov word ptr es:[7ch*4+2],0		; segment
+		
+		; Test the Handler
+		mov dh,10
+		mov dl,10
+		mov cl,2
+		mov ax,data
+		mov ds,ax
+		mov si,0
+		int 7ch
+		
+		mov ax,4c00h
+		int 21h
+		
+		
+; Interrupt Handler Start
+	do0:	push si
+			push di
+			push bx
+			push bp
+			push ax
+			push dx
+			push cx
+			
+			mov ax,0B800H
+			mov es,ax
+			
+			mov al,0A0H
+			mov bl,dh
+			mul bl
+			
+			mov bp,ax		; first column of the line
+			
+			mov al,2
+			mul dl
+			add bp,ax		; exact position
+			
+			mov di,0
+			mov dl,cl
+			mov ch,0
+			
+		s:	mov cl,ds:[si]
+			jcxz done
+			mov es:[bp+di],cl
+			mov es:[bp+di+1],dl
+			add di,2
+			inc si
+			jmp short s
+			
+	done:	pop cx
+			pop dx
+			pop ax
+			pop bp
+			pop bx
+			pop di
+			pop si
+			iret
+
+do0end:		nop
+
+code ends
+end start
diff --git a/Lab13/lab13_2.asm b/Lab13/lab13_2.asm
@@ -0,0 +1,91 @@
+; Lab 13.2 - Interrupt Handler
+; func: Loop
+; args: (cx) = cycles;  (bx) = offset
+
+; ## NOTES 
+; 
+; * `int 7ch` context
+; 
+; AX=B800  BX=FFF7  CX=0050  DX=0000  SP=0000  BP=0000  SI=0052  DI=0782
+; DS=0B28  ES=B800  SS=0B28  CS=0B28  IP=003D   NV UP EI PL NZ NA PE NC
+; 0B28:003D CD7C          INT     7C
+; -t
+; 
+; AX=B800  BX=FFF7  CX=0050  DX=0000  SP=FFFA  BP=0000  SI=0052  DI=0782
+; DS=0B28  ES=B800  SS=0B28  CS=0000  IP=0200   NV UP DI PL NZ NA PE NC
+; 0000:0200 83E901        SUB     CX,+01
+; 
+; 
+; 
+; * `iret` context in the loop
+; AX=B800  BX=FFF7  CX=004F  DX=0000  SP=FFFA  BP=0000  SI=0052  DI=0782
+; DS=0B28  ES=B800  SS=0B28  CS=0000  IP=020C   NV UP DI PL NZ AC PE CY
+; 0000:020C CF            IRET
+; -t
+; 
+; AX=B800  BX=FFF7  CX=004F  DX=0000  SP=0000  BP=0000  SI=0052  DI=0782
+; DS=0B28  ES=B800  SS=0B28  CS=0B28  IP=0036   NV UP EI PL NZ NA PE NC
+; 0B28:0036 26            ES:
+; 0B28:0037 C60521        MOV     BYTE PTR [DI],21                   ES:0782=30
+; 
+; 
+; 
+; * `iret` context at the end of the loop
+; AX=B800  BX=FFF7  CX=0000  DX=0000  SP=FFFA  BP=0000  SI=0052  DI=0782
+; DS=0B28  ES=B800  SS=0B28  CS=0000  IP=020C   NV UP DI PL ZR NA PE NC
+; 0000:020C CF            IRET
+; -t
+; 
+; AX=B800  BX=FFF7  CX=0000  DX=0000  SP=0000  BP=0000  SI=0052  DI=0782
+; DS=0B28  ES=B800  SS=0B28  CS=0B28  IP=003F   NV UP EI PL NZ NA PE NC
+; 0B28:003F 90            NOP
+;
+
+assume cs:code
+code segment
+start:	; Set Up the Interrupt Handler
+		mov ax,cs
+		mov ds,ax
+		mov si,offset do0
+		mov ax,0
+		mov es,ax
+		mov di,200h
+		
+		mov cx,offset do0end-offset do0
+		cld
+		rep movsb
+		
+		; Set Interrupt Vector Table
+		mov ax,0
+		mov es,ax
+		mov word ptr es:[7ch*4],200h	; offset
+		mov word ptr es:[7ch*4+2],0		; segment
+		
+		; Test the Handler
+		mov ax,0b800h
+		mov es,ax
+		mov di,160*12
+		mov bx,offset s-offset se
+		mov cx,80
+	s:	mov byte ptr es:[di],'!'
+		add di,2
+		int 7ch
+	se:	nop
+		
+		mov ax,4c00h
+		int 21h
+		
+		
+; Interrupt Handler Start
+	do0:	sub cx,1
+			jcxz el
+			push bp
+			mov bp,sp
+			add [bp+2],bx
+			pop bp
+	el:		iret
+
+do0end:		nop
+
+code ends
+end start