qmove.asm

dos下开发TCP网络的库文件部分

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;  qmove.asm
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;  Efficient move operation.  Does not handle segment wraps!!!!
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;  Usage :
;	    move( soff, sseg, doff, dseg, count )
;	    unsigned int soff;		/* source offset */
;	    unsigned int sseg;		/* source segment */
;	    unsigned int doff;		/* destination offset */
;	    unsigned int dseg;		/* destination segment */
;	    unsigned int count;		/* byte count */
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;  (c) 1984 Erick Engelke
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;  version
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;    0.2    31-Oct-1990   E. P. Engelke  - brief version
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;
	include masmdefs.hsm
	include	model.hsm

codedef QMOVE
datadef

cstart  QMOVE
cpublic qmove
	mov	DX,DS
	mov	BX,ES			;save segment registers
        lds     SI, +@AB+0[BP]
        les     DI, +@AB+4[BP]
        mov     CX, +@AB+8[BP]          ;byte count

        shr     CX, 1
        cld

        rep     movsw
        jnc     @1
        movsb
@1:
	mov	DS,DX
	mov	ES,BX
creturn qmove

cend    QMOVE

        end