7bf4b77233
Because ia16-elf-gcc and the GNU linker do not understand OMF we need to use ELF everywhere. This also means we cannot use "wrt", "seg" and "call/jmp far". Most wrt's are superfluous, and seg and call/jmp far can be replaced by explicit ?GROUP references (to be defined in the linker script).
97 lines
2.8 KiB
NASM
97 lines
2.8 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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global _DosIdle_hlt
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extern _InDOS
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extern _cu_psp
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extern _MachineId
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extern critical_sp
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extern _user_r
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; variables as the following are "part of" module inthndlr.c
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; because of the define MAIN before include globals.h there!
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extern _HaltCpuWhileIdle
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extern _DGROUP_
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;
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_DosIdle_hlt:
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push ds
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mov ds, [cs:_DGROUP_]
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cmp byte [_HaltCpuWhileIdle],1
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jb DosId0
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pushf
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sti
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hlt ; save some energy :-)
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popf
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DosId0: pop ds
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retn
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;
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_DosIdle_int:
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call _DosIdle_hlt
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push ds
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mov ds, [cs:_DGROUP_]
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cmp byte [_InDOS],1
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ja 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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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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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 [_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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ret
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; segment _DATA ; belongs to DGROUP
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; whatever db whatever
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