Mail Archives: djgpp/2004/07/26/06:14:03
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| Message-ID: | <014301c472f9$33d162c0$0d01a8c0@josepmariaxp>
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| From: | "turomas" <josepmaria AT turomas DOT com>
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| To: | <djgpp AT delorie DOT com>
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| Subject: | PM hardware interrupts
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| Date: | Mon, 26 Jul 2004 12:13:13 +0200
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First:
The inline assembler is to store the coprocessor state and restor it =
after interrupt ends. (If the interrupt ocurs when coprocessor is doing =
any action - A floating comparation - and there are floating point =
operations in the interrupt the coprocessor makes non interrupt =
operation wrong).
Second:
It is normal ethernet cards, sound cards, etcs... uses Int10. Try to use =
Int 9 or Int 5. If you want to use Int 10 go to Bios configuration =
PNP/PCI Configuration and tell Bios that you uses NO PNP Operating =
System. Then go to IRQ Resources and put Irq 10 to Legacy ISA. This =
reserve IRQ10 to you because no PNP cards can uses this interrupt.
Third:
When a interrupt finishes you have to tell it to processor and to PIC. =
Processor accepts new interrupts when receives enable() ("sti") or when =
receives "iret" function. Don't put enable() in your interrupt code, =
DPMI libraries do it for you and it can crash your code. PIC have to =
receive an non specific EOI outport(0x20,0x20).
I did have problems with chain in some interrupts. What hapens if old =
ineterrupt enables CPU in the middle of the code?........
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<DIV><FONT face=3DArial size=3D2>First:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>The inline assembler is to store the =
coprocessor=20
state and restor it after interrupt ends. (If the interrupt ocurs when=20
coprocessor is doing any action - A floating comparation - and there are =
floating point operations in the interrupt the coprocessor makes non =
interrupt=20
operation wrong).</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Second:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>It is normal ethernet cards, sound =
cards, etcs...=20
uses Int10. Try to use Int 9 or Int 5. If you want to use Int 10 go to =
Bios=20
configuration PNP/PCI Configuration and tell Bios that you uses NO PNP =
Operating=20
System. Then go to IRQ Resources and put Irq 10 to Legacy ISA. This =
reserve=20
IRQ10 to you because no PNP cards can uses this =
interrupt.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Third:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>When a interrupt finishes you have to =
tell it to=20
processor and to PIC. Processor accepts new interrupts when receives =
enable()=20
("sti") or when receives "iret" function. Don't put enable() in =
your=20
interrupt code, DPMI libraries do it for you and it can crash your =
code.=20
PIC have to receive an non specific EOI=20
outport(0x20,0x20).</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I did have problems with chain in some =
interrupts.=20
What hapens if old ineterrupt enables CPU in the middle of the=20
code?........</FONT></DIV></BODY></HTML>
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