dhlp027.asm

嵌入式RMON,RMON为Remote monitor的缩写,基于SNMP为网络提供主动监控及错误告警,智能交换路由必备协议

;************************************************************************
;* MODULE INFORMATION*
;**********************
;*     FILE     NAME:       dhlp027.asm
;*     SYSTEM   NAME:       devhelp
;*     ORIGINAL AUTHOR(S):  Paul Lemmers
;*     VERSION  NUMBER:     
;*     CREATION DATE:       1990/8/14
;*
;* DESCRIPTION: 
;*              Contains DevHelp VerifyAccess function.
;************************************************************************
;* CHANGES INFORMATION **
;************************
;* REVISION:    $Revision:   1.1  $
;* WORKFILE:    $Workfile:   dhlp027.asm  $
;* LOGINFO:     $Log:   D:/CPROG/MYDEV/DEVLIB/VCS/DHLP027.ASV  $
;*              
;*                 Rev 1.1   17 Dec 1990 14:31:22   PAUL
;*              included devhlp.inc and os2def.h types
;*              
;*                 Rev 1.0   14 Aug 1990 14:37:10   PAUL
;*              Initial revision.
;************************************************************************/
;
	INCLUDE	cdev.inc
	INCLUDE	devhlp.inc


_DATA	SEGMENT
	EXTRN	_DevHelp:DWORD
_DATA	ENDS

_TEXT	SEGMENT
	PUBLIC	_dev_VerifyAccess
;************************************************************************
;* NAME:        dev_VerifyAccess
;* SYNOPSIS:    USHORT dev_VerifyAccess(void _far *ptr, USHORT len,
;*                                   USHORT type)
;*              void far *ptr1;     Virtual address
;*              USHORT  len;        Length of memory
;*              USHORT  atype;      Access type
;* DESCRIPTION: See DevHelp documentation of VerifyAccess.
;* UNMODIFIED REGISTERS:
;*              ds bp si di
;* RETURNS:     ax = 0 -->   no error
;*              else    error code
;************************************************************************
	ptr1  = 4
	len  = 8
	atype = 0Ah
_dev_VerifyAccess	PROC	NEAR
	PUSH	BP
	MOV	BP,SP
	mov	bx,di		; save di

	mov	ax,[bp+ptr1+2]	; get selector
	mov	di,[bp+ptr1]	; get offset
	mov	cx,[bp+len]	; get length
	mov	dh,[bp+atype]	; get type
	mov	dl,DevHlp_VerifyAccess
	call	[_DevHelp]
	jc	$L000		; jump if access not allowed
	xor	ax,ax
	jmp	short $L001
$L000:	mov	ax,0ffffh

$L001:	mov	di,bx		; restore di
	POP	BP
	RET
_dev_VerifyAccess	ENDP

_TEXT	ENDS

	END