mirror of https://github.com/nmlgc/ReC98.git
102 lines
1.7 KiB
NASM
102 lines
1.7 KiB
NASM
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; master library - PC98 - MSDOS - EMS
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;
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; Description:
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; EMSメモリからデータを読み込む (Level 2)
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;
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; Function/Procedures:
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; int ems_read( unsigned handle, long offs, void far * mem, long len ) ;
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;
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; Parameters:
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; unsigned handle EMSハンドル
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; long offs EMSメモリ内のオフセットアドレス
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; void far * mem 格納先の先頭アドレス
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; long len 読み込むデータの長さ(バイト数)
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;
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; Returns:
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; 0 ........... success
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; 80h〜 ....... failure(EMS エラーコード)
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;
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; Binding Target:
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; Microsoft-C / Turbo-C / Turbo Pascal
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;
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; Running Target:
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; PC-9801
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;
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; Requiring Resources:
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; CPU: 8086
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; EMS: LIM EMS 4.0
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;
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; Notes:
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;
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;
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; Compiler/Assembler:
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; TASM 3.0
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; OPTASM 1.6
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;
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; Author:
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; 恋塚昭彦
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;
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; Revision History:
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; 92/11/16 Initial
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; 93/ 2/24 bugfix (large data model)
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func EMS_READ
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push BP
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mov BP,SP
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sub SP,18
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; 引数
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@@handle = (RETSIZE+7)*2
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@@offs = (RETSIZE+5)*2
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@@mem = (RETSIZE+3)*2
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@@len = (RETSIZE+1)*2
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@@block = -18
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mov AX,[BP+@@len]
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mov DX,[BP+@@len+2]
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mov [BP+@@block],AX ;block
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mov [BP+@@block+2],DX
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mov BYTE PTR [BP+@@block+4],1 ; EMS
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mov AX,[BP+@@handle]
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mov [BP+@@block+5],AX
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mov AX,[BP+@@offs]
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mov DX,AX
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and DH,3Fh
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mov [BP+@@block+7],DX
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mov DX,[BP+@@offs+2]
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shl AX,1
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rcl DX,1
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shl AX,1
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rcl DX,1
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mov [BP+@@block+9],DX
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mov BYTE PTR [BP+@@block+11],0 ; Main Memory
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mov WORD PTR [BP+@@block+12],0
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mov AX,[BP+@@mem]
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mov [BP+@@block+14],AX
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mov AX,[BP+@@mem+2]
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mov [BP+@@block+16],AX
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_push SS
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lea AX,WORD PTR [BP+@@block]
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push AX
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_call EMS_MOVEMEMORYREGION
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push AX ; push result
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sub AX,AX
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push AX
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_call EMS_ENABLEPAGEFRAME
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pop AX ; pop result
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mov SP,BP
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pop BP
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ret 14
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endfunc
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