| 1 | ; $Id: devhlp.asm,v 1.2 2000/04/26 18:00:58 sandervl Exp $
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| 2 |
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| 3 |
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| 4 | ; 32 bits OS/2 device driver and IFS support driver. Provides 32 bits kernel
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| 5 | ; services (DevHelp) and utility functions to 32 bits OS/2 ring 0 code
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| 6 | ; (device drivers and installable file system drivers).
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| 7 | ; Copyright (C) 1995, 1996 Matthieu WILLM
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| 8 | ;
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| 9 | ; This program is free software; you can redistribute it and/or modify
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| 10 | ; it under the terms of the GNU General Public License as published by
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| 11 | ; the Free Software Foundation; either version 2 of the License, or
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| 12 | ; (at your option) any later version.
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| 13 | ;
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| 14 | ; This program is distributed in the hope that it will be useful,
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| 15 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 17 | ; GNU General Public License for more details.
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| 18 | ;
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| 19 | ; You should have received a copy of the GNU General Public License
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| 20 | ; along with this program; if not, write to the Free Software
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| 21 | ; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 22 |
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| 23 | .386p
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| 24 |
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| 25 | include bseerr.inc
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| 26 | include devhlp.inc
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| 27 | include sbseg.inc
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| 28 |
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| 29 | DosTable2 struc
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| 30 | d2_ErrMap24 dd ?
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| 31 | d2_MsgMap24 dd ?
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| 32 | d2_Err_Table_24 dd ?
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| 33 | d2_CDSAddr dd ?
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| 34 | d2_GDT_RDR1 dd ?
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| 35 | d2_InterruptLevel dd ?
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| 36 | d2__cInDos dd ?
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| 37 | d2_zero_1 dd ?
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| 38 | d2_zero_2 dd ?
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| 39 | d2_FlatCS dd ?
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| 40 | d2_FlatDS dd ?
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| 41 | d2__TKSSBase dd ?
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| 42 | d2_intSwitchStack dd ?
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| 43 | d2_privateStack dd ?
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| 44 | d2_PhysDiskTablePtr dd ?
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| 45 | d2_forceEMHandler dd ?
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| 46 | d2_ReserveVM dd ?
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| 47 | d2_pgpPageDir dd ?
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| 48 | d2_unknown dd ?
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| 49 | DosTable2 ends
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| 50 |
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| 51 | DATA32 segment
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| 52 | public DevHelp32
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| 53 | public TKSSBase
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| 54 |
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| 55 | DevHelp32 dd 0
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| 56 | TKSSBase dd 0
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| 57 |
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| 58 | DATA32 ends
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| 59 |
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| 60 |
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| 61 | CODE32 segment
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| 62 | ASSUME CS:FLAT, DS:FLAT, ES:FLAT
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| 63 |
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| 64 | public GetTKSSBase
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| 65 | public iodelay32_
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| 66 | extrn DevHlp : near
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| 67 | extrn DOSIODELAYCNT : ABS
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| 68 |
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| 69 | ALIGN 4
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| 70 |
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| 71 | GetTKSSBase proc near
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| 72 | push ebp
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| 73 | mov ebp, esp
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| 74 | push es
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| 75 | push ebx
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| 76 | push ecx
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| 77 | push edx
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| 78 |
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| 79 | ;
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| 80 | ; Gets the TKSSBase pointer from DosTable. TKSSBase is used by
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| 81 | ; __StackToFlat() to convert a stack based address to a FLAT address
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| 82 | ; without the overhead of DevHlp_VirtToLin
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| 83 | ;
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| 84 | ; DosTable is obtained through GetDOSVar with undocumented index 9
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| 85 | ; The layout is :
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| 86 | ; byte count of following dword (n)
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| 87 | ; dword 1 -+
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| 88 | ; . |
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| 89 | ; . | this is DosTable1
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| 90 | ; . |
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| 91 | ; dword n -+
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| 92 | ; byte count of following dword (p)
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| 93 | ; dword 1 -+
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| 94 | ; . |
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| 95 | ; . | this is DosTable2
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| 96 | ; . |
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| 97 | ; dword p -+
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| 98 | ;
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| 99 | ; Flat CS is dword number 10 in DosTable2
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| 100 | ; Flat DS is dword number 11 in DosTable2
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| 101 | ; TKSSBase is dword number 12 in DosTable2
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| 102 | ;
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| 103 | mov eax, 9 ; undocumented DosVar : DosTable pointer
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| 104 | xor ecx, ecx
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| 105 | mov edx, DevHlp_GetDOSVar
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| 106 | call DevHlp
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| 107 | jc short GetTKSSBase_Err
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| 108 | mov es, ax ; es:bx points to DosTable
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| 109 | movzx ebx, bx
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| 110 | movzx ecx, byte ptr es:[ebx] ; count of dword in DosTable1
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| 111 | mov eax, es:[ebx + 4 * ecx + 2].d2__TKSSBase
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| 112 | mov TKSSBase, eax
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| 113 |
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| 114 | xor eax, eax
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| 115 | GetTKSSBase_Err:
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| 116 | pop edx
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| 117 | pop ecx
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| 118 | pop ebx
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| 119 | pop es
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| 120 | leave
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| 121 | ret
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| 122 | GetTKSSBase endp
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| 123 |
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| 124 | iodelay32_ proc near
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| 125 | mov eax, DOSIODELAYCNT
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| 126 | align 4
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| 127 | @@: dec eax
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| 128 | jnz @b
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| 129 | loop iodelay32_
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| 130 | ret
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| 131 | iodelay32_ endp
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| 132 |
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| 133 | CODE32 ends
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| 134 |
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| 135 | end
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