em_sti.s

来自「minix操作系统最新版本（3.1.1）的源代码」· S 代码 · 共 33 行

.define .sti
.define .sts
.text

	! #bytes in cx
	! address in bx
	! save di/si. they might be register variables
.sts:
	mov	dx,di		! save di
	mov	di,bx
	pop     bx              ! return address
	sar     cx,#1
	jnb     1f
	pop     ax
	stosb
	mov	di,dx
	jmp     (bx)
.sti:
	! only called with count > 4
	mov	dx,di
	mov	di,bx
	pop	bx
	sar	cx,#1
1:
	mov	ax,si
	mov     si,sp
	rep
	mov
	mov     sp,si
	mov	di,dx
	mov	si,ax
	jmp     (bx)