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{
This file is part of the PTCPas framebuffer library
Copyright (C) 2001-2010 Nikolay Nikolov (nickysn@users.sourceforge.net)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version
with the following modification:
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules,and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms
and conditions of the license of that module. An independent module is a
module which is not derived from or based on this library. If you modify
this library, you may extend this exception to your version of the library,
but you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
}
{$MODE objfpc}
{$ASMMODE intel}
{$GOTO on}
unit timeunit;
interface
type
TGetClockTics = function: QWord;
var
TimerResolution: Double;
CPS: Double;
GetClockTics: TGetClockTics;
implementation
var
UseRDTSC: Boolean;
Clk1Lo, Clk1Hi, Clk2Lo, Clk2Hi: DWord;
Clk1, Clk2: QWord;
ClkDelta: QWord;
CpuFlags: DWord;
function GetClockTics_RDTSC: QWord; Assembler;
Asm
rdtsc
end;
function GetClockTics_LAME: QWord;
begin
GetClockTics_LAME := MemL[$46C];
end;
procedure DetectCPUSpeed_RDTSC;
begin
{word absolute $46C}
Asm
mov di, fs:[046Ch]
@@1:
cmp di, fs:[046Ch]
je @@1
rdtsc
mov ebx, eax
mov ecx, edx
mov di, fs:[046Ch]
@@2:
mov ax, fs:[046Ch]
sub ax, di
cmp ax, 32
jb @@2
rdtsc
mov [Clk1Lo], ebx
mov [Clk1Hi], ecx
mov [Clk2Lo], eax
mov [Clk2Hi], edx
end ['EAX','EBX','ECX','EDX','EDI'];
{ Clk1 := Clk1Lo or (QWord(Clk1Hi) shl 32);
Clk2 := Clk2Lo or (QWord(Clk2Hi) shl 32);}
Clk1 := Clk1Hi;
Clk1 := Clk1 shl 32;
Clk1 := Clk1 + Clk1Lo;
Clk2 := Clk2Hi;
Clk2 := Clk2 shl 32;
Clk2 := Clk2 + Clk2Lo;
ClkDelta := Clk2 - Clk1;
CPS := (ClkDelta * 18.2) / 32;
TimerResolution := 1 / CPS;
end;
procedure _CPU; Assembler;
Label
nocpuid;
Asm
mov CpuFlags, 0
pushf
pop eax
mov ecx, eax
xor eax, 40000h
push eax
popf
pushf
pop eax
xor eax, ecx
jz nocpuid
push ecx
popf
mov eax, ecx
xor eax, 200000h
push eax
popf
pushf
pop eax
xor eax, ecx
je nocpuid
pusha
mov eax, 1
cpuid
mov CpuFlags, edx
popa
nocpuid:
end;
procedure DetectCPU;
begin
_CPU;
if (CpuFlags and $10) <> 0 then
UseRDTSC := True
else
UseRDTSC := False;
if UseRDTSC then
begin
DetectCPUSpeed_RDTSC;
GetClockTics := @GetClockTics_RDTSC;
end
else
begin
TimerResolution := 1 / 18.2;
GetClockTics := @GetClockTics_LAME;
end;
end;
initialization
begin
DetectCPU;
end;
end.
|
