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amigalib.pas
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Pascal/Delphi Source File
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1998-09-22
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5KB
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196 lines
{
This file is part of the Free Pascal run time library.
A file in Amiga system run time library.
Copyright (c) 1998 by Nils Sjoholm
member of the Amiga RTL development team.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
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.
**********************************************************************}
unit amigalib;
INTERFACE
uses exec;
{* Exec support functions from amiga.lib *}
procedure BeginIO (ioRequest: pIORequest);
function CreateExtIO (port: pMsgPort; size: Longint): pIORequest;
procedure DeleteExtIO (ioReq: pIORequest);
function CreateStdIO (port: pMsgPort): pIOStdReq;
procedure DeleteStdIO (ioReq: pIOStdReq);
function CreatePort (name: STRPTR; pri: integer): pMsgPort;
procedure DeletePort (port: pMsgPort);
function CreateTask (name: STRPTR; pri: longint;
initPC : Pointer;
stackSize : ULONG): pTask;
procedure DeleteTask (task: pTask);
procedure NewList (list: pList);
IMPLEMENTATION
{* Exec support functions from amiga.lib *}
procedure BeginIO (ioRequest: pIORequest);
begin
asm
move.l a6,-(a7)
move.l ioRequest,a1 ; get IO Request
move.l 20(a1),a6 ; extract Device ptr
jsr -30(a6) ; call BEGINIO directly
move.l (a7)+,a6
end;
end;
function CreateExtIO (port: pMsgPort; size: Longint): pIORequest;
var
IOReq: pIORequest;
begin
IOReq := NIL;
if port <> NIL then
begin
IOReq := AllocMem(size, MEMF_CLEAR or MEMF_PUBLIC);
if IOReq <> NIL then
begin
IOReq^.io_Message.mn_Node.ln_Type := NT_REPLYMSG;
IOReq^.io_Message.mn_Length := size;
IOReq^.io_Message.mn_ReplyPort := port;
end;
end;
CreateExtIO := IOReq;
end;
procedure DeleteExtIO (ioReq: pIORequest);
begin
if ioReq <> NIL then
begin
ioReq^.io_Message.mn_Node.ln_Type := $FF;
ioReq^.io_Message.mn_ReplyPort := pMsgPort(-1);
ioReq^.io_Device := pDevice(-1);
ExecFreeMem(ioReq, ioReq^.io_Message.mn_Length);
end
end;
function CreateStdIO (port: pMsgPort): pIOStdReq;
begin
CreateStdIO := pIOStdReq(CreateExtIO(port, sizeof(tIOStdReq)))
end;
procedure DeleteStdIO (ioReq: pIOStdReq);
begin
DeleteExtIO(pIORequest(ioReq))
end;
function CreatePort (name: STRPTR; pri: integer): pMsgPort;
var
port : pMsgPort;
sigbit : shortint;
begin
port := NIL;
sigbit := AllocSignal(-1);
if sigbit <> -1 then
begin
port := AllocMem(sizeof(tMsgPort), MEMF_CLEAR or MEMF_PUBLIC);
if port = NIL then
FreeSignal(sigbit)
else
begin
port^.mp_Node.ln_Name := name;
port^.mp_Node.ln_Pri := pri;
port^.mp_Node.ln_Type := NT_MSGPORT;
port^.mp_Flags := PA_SIGNAL;
port^.mp_SigBit := sigbit;
port^.mp_SigTask := FindTask(NIL);
if name <> NIL then
AddPort(port)
else
NewList(@port^.mp_MsgList);
end;
end;
CreatePort := port;
end;
procedure DeletePort (port: pMsgPort);
begin
if port <> NIL then
begin
if port^.mp_Node.ln_Name <> NIL then
RemPort(port);
port^.mp_SigTask := pTask(-1);
port^.mp_MsgList.lh_Head := pNode(-1);
FreeSignal(port^.mp_SigBit);
ExecFreeMem(port, sizeof(tMsgPort));
end;
end;
function CreateTask (name: STRPTR; pri: longint;
initPC: pointer; stackSize: ULONG): pTask;
var
memlist : pMemList;
task : pTask;
totalsize : Longint;
begin
task := NIL;
stackSize := (stackSize + 3) and not 3;
totalsize := sizeof(tMemList) + sizeof(tTask) + stackSize;
memlist := AllocMem(totalsize, MEMF_PUBLIC + MEMF_CLEAR);
if memlist <> NIL then begin
memlist^.ml_NumEntries := 1;
memlist^.ml_ME[0].me_Un.meu_Addr := Pointer(memlist + 1);
memlist^.ml_ME[0].me_Length := totalsize - sizeof(tMemList);
task := pTask(memlist + sizeof(tMemList) + stackSize);
task^.tc_Node.ln_Pri := pri;
task^.tc_Node.ln_Type := NT_TASK;
task^.tc_Node.ln_Name := name;
task^.tc_SPLower := Pointer(memlist + sizeof(tMemList));
task^.tc_SPUpper := Pointer(task^.tc_SPLower + stackSize);
task^.tc_SPReg := task^.tc_SPUpper;
NewList(@task^.tc_MemEntry);
AddTail(@task^.tc_MemEntry,@memlist^.ml_Node);
AddTask(task,initPC,NIL)
end;
CreateTask := task;
end;
procedure DeleteTask (task: pTask);
begin
RemTask(task)
end;
procedure NewList (list: pList);
begin
with list^ do
begin
lh_Head := pNode(@lh_Tail);
lh_Tail := NIL;
lh_TailPred := pNode(@lh_Head)
end
end;
end.