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Power-Programmierung
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emm25_c.asm
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Assembly Source File
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1989-11-29
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4KB
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85 lines
;-----------------------------------------------------------------------------;
; MODULE NAME: EMM25_C.ASM ;
; ;
; FUNCTION NAME: get_mappable_region_count ;
; ;
; DESCRIPTION: This function gets the number of entries which will be ;
; required for the array of structures the ;
; get_mappable_regions function returns. Note that ;
; this function does not actually return the array but ;
; merely a count of the entries in the array returned ;
; by the get_mappable_regions function. This number also ;
; represents the total number of mappable memory pages in ;
; the system. ;
; ;
; PASSED: &mr_count: ;
; is a far pointer to a count of the number of entries ;
; in the array of structures that are returned by the ;
; get_mappable_regions function. ;
; ;
; 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. ;
; ;
; mr_count: ;
; is a count of the number of entries in the mr ;
; array of structures returned by the ;
; get_mappable_regions function. ;
; ;
; C USE CONVENTION: unsigned int status; ;
; unsigned int mr_count; ;
; ;
; status = get_mappable_region_count (&mr_count); ;
;-----------------------------------------------------------------------------;
.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
get_mappable_region_count PROC \
ptr_mappable_region_count:FAR PTR WORD
;---------------------------------------------------------------------;
; do; ;
; . get the mappable region count from EMM; ;
;---------------------------------------------------------------------;
MOVE AX, get_mappable_array_entries_fcn
INT EMM_int
;---------------------------------------------------------------------;
; . pass the mappable region count back to the caller; ;
;---------------------------------------------------------------------;
MOVE ES:BX, ptr_mappable_region_count
MOVE ES:[BX], CX
;---------------------------------------------------------------------;
; . return (EMM status); ;
; end; ;
;---------------------------------------------------------------------;
RET_EMM_STAT AH
get_mappable_region_count ENDP
END