X86, Config: Make makeX86System consider the number of CPUs, and clean up interrupt assignment.

src/dev/x86/I82094AA.py

@@ -34,6 +34,7 @@ from X86IntPin import X86IntSinkPin
 class I82094AA(BasicPioDevice):
     type = 'I82094AA'
     cxx_class = 'X86ISA::I82094AA'
+    apic_id = Param.Int(1, 'APIC id for this IO APIC')
     pio_latency = Param.Latency('1ns', "Programmed IO latency in simticks")
     pio_addr = Param.Addr("Device address")
     int_port = Port("Port for sending and receiving interrupt messages")

src/dev/x86/i82094aa.cc

@@ -40,7 +40,7 @@ X86ISA::I82094AA::I82094AA(Params *p) : PioDevice(p), IntDev(this),
     extIntPic(p->external_int_pic)
 {
     // This assumes there's only one I/O APIC in the system
-    id = sys->numContexts();
+    id = p->apic_id;
     assert(id <= 0xf);
     arbId = id;
     regSel = 0;

src/dev/x86/i82094aa.hh

@@ -103,8 +103,8 @@ class I82094AA : public PioDevice, public IntDev
     void getIntAddrRange(AddrRangeList &range_list)
     {
         range_list.clear();
-        range_list.push_back(RangeEx(x86InterruptAddress(1, 0),
-                    x86InterruptAddress(1, 0) + PhysAddrAPICRangeSize));
+        range_list.push_back(RangeEx(x86InterruptAddress(id, 0),
+                    x86InterruptAddress(id, 0) + PhysAddrAPICRangeSize));
     }
 
     void writeReg(uint8_t offset, uint32_t value);