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103 lines
2.4 KiB
ObjectPascal
103 lines
2.4 KiB
ObjectPascal
{
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This file is part of the Free Pascal run time library.
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and implements some stuff for protected mode programming
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Copyright (c) 1999-2000 by the Free Pascal development team.
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These files adds support for TP styled port accesses
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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unit ports;
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{ this unit uses classes so
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ObjFpc mode is required PM }
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{$Mode ObjFpc}
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{$Calling StdCall}
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interface
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type
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tport = class
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procedure writeport(p : word;data : byte);
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function readport(p : word) : byte;
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property pp[w : word] : byte read readport write writeport;default;
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end;
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tportw = class
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procedure writeport(p : word;data : word);
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function readport(p : word) : word;
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property pp[w : word] : word read readport write writeport;default;
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end;
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tportl = class
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procedure writeport(p : word;data : longint);
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function readport(p : word) : longint;
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property pp[w : word] : longint read readport write writeport;default;
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end;
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var
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{ we don't need to initialize port, because neither member
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variables nor virtual methods are accessed }
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port,
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portb : tport;
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portw : tportw;
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portl : tportl;
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implementation
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{$asmmode ATT}
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{ to give easy port access like tp with port[] }
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procedure tport.writeport(p : word;data : byte);assembler;
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asm
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movw p,%dx
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movb data,%al
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outb %al,%dx
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end ['EAX','EDX'];
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function tport.readport(p : word) : byte;assembler;
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asm
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movw p,%dx
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inb %dx,%al
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end ['EAX','EDX'];
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procedure tportw.writeport(p : word;data : word);assembler;
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asm
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movw p,%dx
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movw data,%ax
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outw %ax,%dx
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end ['EAX','EDX'];
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function tportw.readport(p : word) : word;assembler;
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asm
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movw p,%dx
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inw %dx,%ax
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end ['EAX','EDX'];
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procedure tportl.writeport(p : word;data : longint);assembler;
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asm
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movw p,%dx
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movl data,%eax
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outl %eax,%dx
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end ['EAX','EDX'];
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function tportl.readport(p : word) : longint;assembler;
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asm
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movw p,%dx
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inl %dx,%eax
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end ['EAX','EDX'];
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end.
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