home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Power-Programmierung
/
CD2.mdf
/
doc
/
ems
/
disk3
/
emm28_i.asm
< prev
next >
Wrap
Assembly Source File
|
1989-11-29
|
3KB
|
73 lines
;-----------------------------------------------------------------------------;
; MODULE NAME: EMM28_I.ASM ;
; ;
; OS FUNCTION NAME: dealloc_DMA_reg_set ;
; ;
; DESCRIPTION: This function deallocates the specified DMA register ;
; set. ;
; ;
; PASSED: DMA_reg_set: ;
; is the DMA register set which should not be used for ;
; DMA operations any longer. The DMA register set ;
; would have been previously allocated and enabled for ;
; DMA operations on a specific DMA channel. If the ;
; DMA register set specified is zero, no action will ;
; be taken. ;
; ;
; RETURNED: status: ;
; is the status EMM returns from the call. All other ;
; returned results are valid only if the status ;
; returned is zero. Otherwise they are undefined. ;
; ;
; C USE CONVENTION: unsigned int status; ;
; unsigned int DMA_reg_set; ;
; ;
; status = dealloc_DMA_reg_set (DMA_reg_set); ;
;-----------------------------------------------------------------------------;
.XLIST
PAGE 60,132
IFDEF SMALL
.MODEL SMALL, C
ENDIF
IFDEF MEDIUM
.MODEL MEDIUM, C
ENDIF
IFDEF LARGE
.MODEL LARGE, C
ENDIF
IFDEF COMPACT
.MODEL COMPACT, C
ENDIF
IFDEF HUGE
.MODEL HUGE, C
ENDIF
INCLUDE emmlib.equ
INCLUDE emmlib.str
INCLUDE emmlib.mac
.LIST
.CODE
dealloc_DMA_reg_set PROC \
DMA_reg_set:WORD
;---------------------------------------------------------------------;
; do; ;
; . return the DMA register set previously allocated to the OS ;
; . back to EMM; ;
;---------------------------------------------------------------------;
MOVE AX, deallocate_dma_reg_set_fcn
MOVE BX, DMA_reg_set
INT EMM_int
;---------------------------------------------------------------------;
; . return (EMM status); ;
; end; ;
;---------------------------------------------------------------------;
RET_EMM_STAT AH
dealloc_DMA_reg_set ENDP
END