f2184025da
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@167 6ac86273-5f31-0410-b378-82cca8765d1b
101 lines
3.2 KiB
NASM
101 lines
3.2 KiB
NASM
; File:
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; DosIdle.asm
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; Description:
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; Dos Idle Interrupt Call
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;
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; DOS-C
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; Copyright (c) 1995, 1999
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; James B. Tabor
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; All Rights Reserved
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;
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; This file is part of DOS-C.
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;
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; DOS-C is free software; you can redistribute it and/or
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; modify it under the terms of the GNU General Public License
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; as published by the Free Software Foundation; either version
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; 2, or (at your option) any later version.
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;
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; DOS-C is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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; the GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public
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; License along with DOS-C; see the file COPYING. If not,
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; write to the Free Software Foundation, 675 Mass Ave,
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; Cambridge, MA 02139, USA.
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;
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;
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%include "segs.inc"
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PSP_USERSP equ 2eh
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PSP_USERSS equ 30h
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segment HMA_TEXT
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global _DosIdle_int
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extern _InDOS:wrt DGROUP
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extern _cu_psp:wrt DGROUP
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extern _MachineId:wrt DGROUP
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extern critical_sp:wrt DGROUP
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extern _lpUserStack:wrt DGROUP
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extern _user_r:wrt DGROUP
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extern _api_sp:wrt DGROUP ; api stacks - for context
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extern _api_ss:wrt DGROUP ; switching
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extern _usr_sp:wrt DGROUP ; user stacks
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extern _usr_ss:wrt DGROUP
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extern _dosidle_flag:wrt DGROUP
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;
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;
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_DosIdle_int:
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push ds
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push ax
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mov ax, DGROUP
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mov ds,ax
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pop ax
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cmp byte [_dosidle_flag],0
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jnz DosId1
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call Do_DosI
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DosId1:
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pop ds
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retn
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Do_DosI:
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inc byte [_dosidle_flag]
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push ax
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push es
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push word [_MachineId]
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push word [_user_r]
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push word [_user_r+2]
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push word [_lpUserStack]
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push word [_lpUserStack+2]
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push word [_api_sp]
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push word [_api_ss]
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push word [_usr_sp]
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push word [_usr_ss]
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mov es,word [_cu_psp]
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push word [es:PSP_USERSS]
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push word [es:PSP_USERSP]
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int 28h
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mov es,word [_cu_psp]
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pop word [es:PSP_USERSP]
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pop word [es:PSP_USERSS]
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pop word [_usr_ss]
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pop word [_usr_sp]
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pop word [_api_ss]
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pop word [_api_sp]
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pop word [_lpUserStack+2]
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pop word [_lpUserStack]
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pop word [_user_r+2]
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pop word [_user_r]
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pop word [_MachineId]
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pop es
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pop ax
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dec byte [_dosidle_flag]
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ret
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