.TITLE	LCK$VM - LOCK VM BUFFER
	.SBTTL	LCK$VM - TITLE PAGE
	.PSECT	VMX$$$,RO,I
	.IDENT	/V01.01/
	.ENABL	LC
;
; ************************************************************************
;                                                                        *
; THIS PROGRAM IS PROVIDED ON AN "AS IS" BASIS ONLY.  DIGITAL  EQUIPMENT *
; COMPUTER USER'S SOCIETY,  DIGITAL EQUIPMENT CORPORATION, MONSANTO, AND *
; THE AUTHOR DISCLAIM  ALL WARRANTIES ON THE PROGRAM,  INCLUDING WITHOUT *
; LIMITATION, ALL IMPLIED WARRANTIES OF MERCHANTABLITY AND FITNESS.      *
;									 *
; FULL PERMISSION AND CONSENT IS HEREBY GIVEN TO DECUS  AND TO THE DECUS *
; SPECIAL INTEREST  GROUPS  TO  REPRODUCE,  DISTRIBUTE,  AND PUBLISH AND *
; PERMIT  OTHERS  TO  REPRODUCE  IN  WHOLE  OR  IN PART, IN ANY FORM AND *
; WITHOUT RESTRICTION, THIS PROGRAM AND ANY INFORMATION RELATING TO IT.  *
;									 *
; ************************************************************************
;
; LOCK VM BUFFER
;
; VERSION:	V01.01
;
; AUTHOR:	R.W. STAMERJOHN	MAPC	03-NOV-81
;
; MODIFICATION HISTORY:
;
;	V01.01	RWS	03-NOV-81	INITIAL VERSION
;

	.SBTTL	LCK$VM - DECLARATIONS
	.DSABL	GBL
	.DSABL	CRF
;
; MACRO LIBRARY CALLS:
;
	.MCALL	CALLR			;Call subroutine and return
;
; GLOBAL DECLARATIONS:
;
	.GLOBL	LCK$VM			;Module entry
;
; GLOBAL REFERENCES:
;
;	VM subroutines.
;
	.GLOBL	LCK$VI			;Lock virtual buffer
	.GLOBL	MAP$VI			;Map virtual buffer
	.GLOBL	S32$VI			;Check size is in range

	.ENABL	CRF

	.SBTTL	LCK$VM * LOCK VM BUFFER
;
;+
; This routine locks the specified virtual buffer into memory until
; released by an unlock call. 
;
; INPUT:
;
;	Call by:	JSR	PC, LCK$VM
;
;				R0,R1	= Virtual address
;				R3	= Size of virtual buffer
;
; OUTPUT:
;
;	The buffer starting at the virtual address is locked into memory.
;	If necessary, the space is read into memory.
;
; REGISTERS:
;
;	Uses:	R0-R5	Saves:	R0-R4	Stack:	1 words
;-
LCK$VM::				;Ref label
	CALL	S32$VI			;Check size is legal
	CALL	MAP$VI			;Map virtual buffer
	CALLR	LCK$VI			;Call lock routine and return

	.END