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X86: Mask the PIC at startup to avoid a glitch which causes an NMI.

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This commit is contained in:
Gabe Black 2009-04-19 04:15:06 -07:00
parent 25e223c30f
commit e174239bd8
2 changed files with 19 additions and 2 deletions
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14
src/dev/x86/i8259.hh
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@ -39,8 +39,6 @@
namespace X86ISA namespace X86ISA
{ {
class I82094AA;
class I8259 : public BasicPioDevice, public IntDev class I8259 : public BasicPioDevice, public IntDev
{ {
protected: protected:
@ -94,6 +92,18 @@ class I8259 : public BasicPioDevice, public IntDev
Tick read(PacketPtr pkt); Tick read(PacketPtr pkt);
Tick write(PacketPtr pkt); Tick write(PacketPtr pkt);
void
maskAll()
{
IMR = 0xFF;
}
void
unmaskAll()
{
IMR = 0x00;
}
void signalInterrupt(int line); void signalInterrupt(int line);
void raiseInterruptPin(int number); void raiseInterruptPin(int number);
void lowerInterruptPin(int number); void lowerInterruptPin(int number);

7
src/dev/x86/pc.cc
View file

@ -107,6 +107,13 @@ Pc::init()
entry.vector = 0x30; entry.vector = 0x30;
ioApic.writeReg(0x30, entry.bottomDW); ioApic.writeReg(0x30, entry.bottomDW);
ioApic.writeReg(0x31, entry.topDW); ioApic.writeReg(0x31, entry.topDW);
/*
* Mask the PICs. I'm presuming the BIOS/bootloader would have cleared
* these out and masked them before passing control to the OS.
*/
southBridge->pic1->maskAll();
southBridge->pic2->maskAll();
} }
Tick Tick