| 1 | ;
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| 2 | ; EXTAPI.ASM -- DOS extender API
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| 3 | ;
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| 4 | ; Copyright (c) 1995 by Eberhard Mattes
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| 5 | ;
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| 6 | ; This file is part of emx.
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| 7 | ;
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| 8 | ; emx is free software; you can redistribute it and/or modify it
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| 9 | ; under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2, or (at your option)
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| 11 | ; any later version.
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| 12 | ;
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| 13 | ; emx is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ;
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| 18 | ; You should have received a copy of the GNU General Public License
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| 19 | ; along with emx; see the file COPYING. If not, write to
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| 20 | ; the Free Software Foundation, 59 Temple Place - Suite 330,
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| 21 | ; Boston, MA 02111-1307, USA.
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| 22 | ;
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| 23 | ; See emx.asm for a special exception.
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| 24 | ;
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| 25 |
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| 26 | INCLUDE EMX.INC
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| 27 | INCLUDE PMINT.INC
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| 28 |
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| 29 | PUBLIC EXTAPI
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| 30 |
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| 31 | SV_CODE SEGMENT
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| 32 |
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| 33 | .386P
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| 34 |
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| 35 | ASSUME CS:SV_CODE, DS:NOTHING
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| 36 |
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| 37 | EXT_JUMP WORD EXT00, EXT01, EXT02, EXT03, EXT04
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| 38 | WORD EXT05, EXT06, EXT07, EXT08, EXT09
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| 39 | WORD EXT0A, EXT0B, EXT0C, EXT0D, EXT0E
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| 40 |
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| 41 | ASSUME DS:SV_DATA
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| 42 | ASSUME BP:PTR ISTACKFRAME
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| 43 | EXTAPI PROC NEAR
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| 44 | AND I_EFLAGS, NOT FLAG_C ; Clear carry flag (no error)
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| 45 | MOV AX, WORD PTR I_EAX
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| 46 | CMP AH, 0EH
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| 47 | JA SHORT EXT_INVALID
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| 48 | MOV BL, AH
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| 49 | MOV BH, 0
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| 50 | SHL BX, 1
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| 51 | JMP EXT_JUMP[BX]
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| 52 |
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| 53 | EXT00::
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| 54 | EXT01::
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| 55 | EXT02::
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| 56 | EXT03::
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| 57 | EXT05::
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| 58 | EXT06::
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| 59 | EXT07::
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| 60 | EXT08::
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| 61 | EXT09::
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| 62 | EXT0A::
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| 63 | EXT0B::
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| 64 | EXT0C::
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| 65 | EXT0D::
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| 66 | EXT0E::
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| 67 | EXT_INVALID: MOV AX, 8001H ; Unsupported function
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| 68 | EXT_ERROR: AND EAX, 0FFFFH
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| 69 | MOV I_EAX, EAX
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| 70 | OR I_EFLAGS, FLAG_C ; Set carray flag
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| 71 | RET
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| 72 |
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| 73 | EXT04:: CMP AL, 00H
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| 74 | JE SHORT EXT0400
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| 75 | CMP AL, 01H
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| 76 | JE SHORT EXT0401
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| 77 | JMP EXT_INVALID
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| 78 |
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| 79 | ;
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| 80 | ; Get version
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| 81 | ;
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| 82 | EXT0400: MOV I_EAX, 0100H ; DPMI 1.0
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| 83 | MOV I_EBX, 0005H ; TODO
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| 84 | MOV I_ECX, 0003H ; TODO
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| 85 | MOV I_EDX, 0000H ; TODO
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| 86 | RET
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| 87 |
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| 88 | ;
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| 89 | ; Get DPMI capabilities
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| 90 | ;
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| 91 | EXT0401: MOV EDI, I_EDI
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| 92 | MOV ES, I_ES
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| 93 | MOV I_EAX, 0000H ; TODO
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| 94 | MOV I_ECX, 0 ; Reserved
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| 95 | MOV I_EDX, 0 ; Reserved
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| 96 | MOV BYTE PTR ES:[EDI+0], 0 ; Major version (TODO)
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| 97 | MOV BYTE PTR ES:[EDI+1], 0 ; Minor version (TODO)
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| 98 | MOV BYTE PTR ES:[EDI+2], "e"
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| 99 | MOV BYTE PTR ES:[EDI+3], "m"
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| 100 | MOV BYTE PTR ES:[EDI+4], "x"
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| 101 | MOV BYTE PTR ES:[EDI+5], 0
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| 102 | RET
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| 103 |
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| 104 | EXTAPI ENDP
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| 105 |
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| 106 | SV_CODE ENDS
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| 107 |
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| 108 | END
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