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author | Gabe Black <gblack@eecs.umich.edu> | 2008-10-12 23:22:58 -0700 |
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committer | Gabe Black <gblack@eecs.umich.edu> | 2008-10-12 23:22:58 -0700 |
commit | 8e664f395965b7ff5945d7665eda28cf5592a10a (patch) | |
tree | db66b55e611fb77297854167cde1d6a6a57425f2 /src/dev | |
parent | e3004c579fcd7c3f34dfcbd90169c5aa9218a65b (diff) | |
download | gem5-8e664f395965b7ff5945d7665eda28cf5592a10a.tar.xz |
X86: Make the I8259 PIC accept a specific EOI command.
Diffstat (limited to 'src/dev')
-rw-r--r-- | src/dev/x86/i8259.cc | 42 | ||||
-rw-r--r-- | src/dev/x86/i8259.hh | 3 |
2 files changed, 34 insertions, 11 deletions
diff --git a/src/dev/x86/i8259.cc b/src/dev/x86/i8259.cc index be0bfbe4d..3b0053ee9 100644 --- a/src/dev/x86/i8259.cc +++ b/src/dev/x86/i8259.cc @@ -107,8 +107,12 @@ X86ISA::I8259::write(PacketPtr pkt) DPRINTF(I8259, "Subcommand: No operation.\n"); break; case 0x3: - DPRINTF(I8259, "Subcommand: Specific EIO."); - DPRINTF(I8259, "Reset In-Service bit %d.\n", bits(val, 2, 0)); + { + int line = bits(val, 2, 0); + DPRINTF(I8259, "Subcommand: Specific EIO on line %d.\n", + line); + handleEOI(line); + } break; case 0x4: DPRINTF(I8259, "Subcommand: Rotate in auto-EOI mode (set).\n"); @@ -206,6 +210,30 @@ X86ISA::I8259::write(PacketPtr pkt) } void +X86ISA::I8259::handleEOI(int line) +{ + ISR &= ~(1 << line); + // There may be an interrupt that was waiting which can + // now be sent. + if (IRR) + requestInterrupt(findMsbSet(IRR)); +} + +void +X86ISA::I8259::requestInterrupt(int line) +{ + if (bits(ISR, 7, line) == 0) { + if (output) { + DPRINTF(I8259, "Propogating interrupt.\n"); + output->signalInterrupt(); + } else { + warn("Received interrupt but didn't have " + "anyone to tell about it.\n"); + } + } +} + +void X86ISA::I8259::signalInterrupt(int line) { DPRINTF(I8259, "Interrupt raised on line %d.\n", line); @@ -216,15 +244,7 @@ X86ISA::I8259::signalInterrupt(int line) DPRINTF(I8259, "Interrupt %d was masked.\n", line); } else { IRR |= 1 << line; - if (bits(ISR, 7, line) == 0) { - if (output) { - DPRINTF(I8259, "Propogating interrupt.\n"); - output->signalInterrupt(); - } else { - warn("Received interrupt but didn't have " - "anyone to tell about it.\n"); - } - } + requestInterrupt(line); } } diff --git a/src/dev/x86/i8259.hh b/src/dev/x86/i8259.hh index 371a27874..6f6d3f038 100644 --- a/src/dev/x86/i8259.hh +++ b/src/dev/x86/i8259.hh @@ -73,6 +73,9 @@ class I8259 : public BasicPioDevice, public IntDev bool expectICW4; int initControlWord; + void requestInterrupt(int line); + void handleEOI(int line); + public: typedef I8259Params Params; |