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OS/2 Shareware BBS: 10 Tools
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mwdd_src.zip
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32bits
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ext2-os2
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devhlp32
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DevHlp32_AllocOneGDTSelector.asm
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Assembly Source File
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1997-03-16
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3KB
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86 lines
;
; $Header: d:\\32bits\\ext2-os2\\devhlp32\\rcs\\DevHlp32_AllocOneGDTSelector.asm,v 1.4 1997/03/15 16:38:23 Willm Exp $
;
; 32 bits OS/2 device driver and IFS support. Provides 32 bits kernel
; services (DevHelp) and utility functions to 32 bits OS/2 ring 0 code
; (device drivers and installable file system drivers).
; Copyright (C) 1995, 1996, 1997 Matthieu WILLM (willm@ibm.net)
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
.386p
INCL_DOSERRORS equ 1
include bseerr.inc
include devhlp.inc
include segdef.inc
include r0thunk.inc
CODE16 segment
ASSUME CS:CODE16, DS:FLAT
public thunk16$DevHlp32_AllocOneGDTSelector
thunk16$DevHlp32_AllocOneGDTSelector:
call [DevHelp2]
; jmp far ptr FLAT:thunk32$DevHlp32_AllocOneGDTSelector
jmp32 thunk32$DevHlp32_AllocOneGDTSelector
CODE16 ends
CODE32 segment
ASSUME CS:FLAT, DS:FLAT, ES:FLAT, SS:NOTHING
public thunk32$DevHlp32_AllocOneGDTSelector
public DevHlp32_AllocOneGDTSelector
;
; int DH32ENTRY DevHlp32_AllocOneGDTSelector(
; unsigned short *psel /* ebp + 8 !!! STACK BASED !!! */
; );
;
DevHlp32_AllocOneGDTSelector proc near
enter 2, 0
push es
push ebx
push esi
push edi
lea edi, [ebp - 2] ; tmpsel
mov eax, ss
mov es, eax
mov ecx, 1 ; one selector
mov dl, DevHlp_AllocGDTSelector
jmp far ptr thunk16$DevHlp32_AllocOneGDTSelector
thunk32$DevHlp32_AllocOneGDTSelector:
jc short @@error ; if error, EAX = error code
mov ax, [ebp - 2] ; tmpsel
mov ebx, [ebp + 8] ; psel
mov ss:[ebx], ax ; *psel
mov eax, NO_ERROR
@@error:
pop edi
pop esi
pop ebx
pop es
leave
ret
DevHlp32_AllocOneGDTSelector endp
CODE32 ends
end