diff --git a/src/arch/alpha/process.cc b/src/arch/alpha/process.cc
index be286e30e..4e9f1e9dd 100644
--- a/src/arch/alpha/process.cc
+++ b/src/arch/alpha/process.cc
@@ -40,6 +40,7 @@
 #include "mem/page_table.hh"
 #include "sim/byteswap.hh"
 #include "sim/process_impl.hh"
+#include "sim/syscall_return.hh"
 #include "sim/system.hh"
 
 using namespace AlphaISA;
diff --git a/src/arch/alpha/process.hh b/src/arch/alpha/process.hh
index c41ece837..e5320564f 100644
--- a/src/arch/alpha/process.hh
+++ b/src/arch/alpha/process.hh
@@ -32,6 +32,7 @@
 #ifndef __ARCH_ALPHA_PROCESS_HH__
 #define __ARCH_ALPHA_PROCESS_HH__
 
+#include "mem/page_table.hh"
 #include "sim/process.hh"
 
 class AlphaLiveProcess : public LiveProcess
diff --git a/src/arch/arm/process.cc b/src/arch/arm/process.cc
index cc3d3e200..41bfa5b13 100644
--- a/src/arch/arm/process.cc
+++ b/src/arch/arm/process.cc
@@ -53,6 +53,7 @@
 #include "mem/page_table.hh"
 #include "sim/byteswap.hh"
 #include "sim/process_impl.hh"
+#include "sim/syscall_return.hh"
 #include "sim/system.hh"
 
 using namespace std;
diff --git a/src/arch/arm/process.hh b/src/arch/arm/process.hh
index 39e971c62..657f30af8 100644
--- a/src/arch/arm/process.hh
+++ b/src/arch/arm/process.hh
@@ -48,6 +48,7 @@
 
 #include "arch/arm/intregs.hh"
 #include "base/loader/object_file.hh"
+#include "mem/page_table.hh"
 #include "sim/process.hh"
 
 class LiveProcess;
diff --git a/src/arch/mips/process.cc b/src/arch/mips/process.cc
index dd97fe7f1..d26850604 100644
--- a/src/arch/mips/process.cc
+++ b/src/arch/mips/process.cc
@@ -41,6 +41,7 @@
 #include "mem/page_table.hh"
 #include "sim/process.hh"
 #include "sim/process_impl.hh"
+#include "sim/syscall_return.hh"
 #include "sim/system.hh"
 
 using namespace std;
diff --git a/src/arch/mips/process.hh b/src/arch/mips/process.hh
index 33c02d08b..e05118e9f 100644
--- a/src/arch/mips/process.hh
+++ b/src/arch/mips/process.hh
@@ -35,6 +35,7 @@
 #include <string>
 #include <vector>
 
+#include "mem/page_table.hh"
 #include "sim/process.hh"
 
 class LiveProcess;
diff --git a/src/arch/power/interrupts.hh b/src/arch/power/interrupts.hh
index be5c72151..e41b4aa95 100644
--- a/src/arch/power/interrupts.hh
+++ b/src/arch/power/interrupts.hh
@@ -35,6 +35,7 @@
 #include "params/PowerInterrupts.hh"
 #include "sim/sim_object.hh"
 
+class BaseCPU;
 class ThreadContext;
 
 namespace PowerISA {
diff --git a/src/arch/power/process.cc b/src/arch/power/process.cc
index 880d7dd6f..f7cb41dbb 100644
--- a/src/arch/power/process.cc
+++ b/src/arch/power/process.cc
@@ -41,6 +41,7 @@
 #include "debug/Stack.hh"
 #include "mem/page_table.hh"
 #include "sim/process_impl.hh"
+#include "sim/syscall_return.hh"
 #include "sim/system.hh"
 
 using namespace std;
diff --git a/src/arch/power/process.hh b/src/arch/power/process.hh
index b96c77c70..cc023e2c9 100644
--- a/src/arch/power/process.hh
+++ b/src/arch/power/process.hh
@@ -36,6 +36,7 @@
 #include <string>
 #include <vector>
 
+#include "mem/page_table.hh"
 #include "sim/process.hh"
 
 class LiveProcess;
diff --git a/src/arch/power/remote_gdb.cc b/src/arch/power/remote_gdb.cc
index ef10efc18..1ed7afbc0 100644
--- a/src/arch/power/remote_gdb.cc
+++ b/src/arch/power/remote_gdb.cc
@@ -133,6 +133,7 @@
  * "Stub" to allow remote cpu to debug over a serial line using gdb.
  */
 
+
 #include "arch/power/remote_gdb.hh"
 
 #include <sys/signal.h>
@@ -144,6 +145,7 @@
 #include "cpu/thread_state.hh"
 #include "debug/GDBAcc.hh"
 #include "debug/GDBMisc.hh"
+#include "mem/page_table.hh"
 #include "sim/byteswap.hh"
 
 using namespace std;
diff --git a/src/arch/riscv/interrupts.hh b/src/arch/riscv/interrupts.hh
index b157a3a8c..36eb52909 100644
--- a/src/arch/riscv/interrupts.hh
+++ b/src/arch/riscv/interrupts.hh
@@ -35,6 +35,7 @@
 #include "params/RiscvInterrupts.hh"
 #include "sim/sim_object.hh"
 
+class BaseCPU;
 class ThreadContext;
 
 namespace RiscvISA {
diff --git a/src/arch/riscv/process.cc b/src/arch/riscv/process.cc
index 7fa84035f..c1a67ec15 100644
--- a/src/arch/riscv/process.cc
+++ b/src/arch/riscv/process.cc
@@ -44,6 +44,7 @@
 #include "mem/page_table.hh"
 #include "sim/process.hh"
 #include "sim/process_impl.hh"
+#include "sim/syscall_return.hh"
 #include "sim/system.hh"
 
 using namespace std;
diff --git a/src/arch/riscv/process.hh b/src/arch/riscv/process.hh
index eb0e5f769..53aa7c00a 100644
--- a/src/arch/riscv/process.hh
+++ b/src/arch/riscv/process.hh
@@ -35,6 +35,7 @@
 #include <string>
 #include <vector>
 
+#include "mem/page_table.hh"
 #include "sim/process.hh"
 
 class LiveProcess;
diff --git a/src/arch/sparc/process.cc b/src/arch/sparc/process.cc
index f863eb018..c14680a6a 100644
--- a/src/arch/sparc/process.cc
+++ b/src/arch/sparc/process.cc
@@ -43,6 +43,7 @@
 #include "debug/Stack.hh"
 #include "mem/page_table.hh"
 #include "sim/process_impl.hh"
+#include "sim/syscall_return.hh"
 #include "sim/system.hh"
 
 using namespace std;
diff --git a/src/arch/sparc/process.hh b/src/arch/sparc/process.hh
index e9d81367b..23a1a8c52 100644
--- a/src/arch/sparc/process.hh
+++ b/src/arch/sparc/process.hh
@@ -35,6 +35,7 @@
 #include <string>
 #include <vector>
 
+#include "mem/page_table.hh"
 #include "sim/byteswap.hh"
 #include "sim/process.hh"
 
diff --git a/src/arch/x86/isa_traits.hh b/src/arch/x86/isa_traits.hh
index fcdffec1c..88cd16eff 100644
--- a/src/arch/x86/isa_traits.hh
+++ b/src/arch/x86/isa_traits.hh
@@ -42,6 +42,7 @@
 
 #include "arch/x86/types.hh"
 #include "arch/x86/x86_traits.hh"
+#include "base/compiler.hh"
 #include "base/types.hh"
 
 namespace LittleEndianGuest {}
diff --git a/src/arch/x86/pagetable.hh b/src/arch/x86/pagetable.hh
index 1361109d5..354fb5a5c 100644
--- a/src/arch/x86/pagetable.hh
+++ b/src/arch/x86/pagetable.hh
@@ -46,14 +46,13 @@
 #include <vector>
 
 #include "base/bitunion.hh"
-#include "base/misc.hh"
 #include "base/types.hh"
 #include "base/trie.hh"
-#include "cpu/thread_context.hh"
 #include "arch/x86/system.hh"
 #include "debug/MMU.hh"
 
 class Checkpoint;
+class ThreadContext;
 
 namespace X86ISA
 {
diff --git a/src/arch/x86/process.cc b/src/arch/x86/process.cc
index 116304fb4..a37468a88 100644
--- a/src/arch/x86/process.cc
+++ b/src/arch/x86/process.cc
@@ -59,6 +59,7 @@
 #include "mem/page_table.hh"
 #include "sim/process_impl.hh"
 #include "sim/syscall_desc.hh"
+#include "sim/syscall_return.hh"
 #include "sim/system.hh"
 
 using namespace std;
diff --git a/src/arch/x86/pseudo_inst.cc b/src/arch/x86/pseudo_inst.cc
index edba0474a..acf310631 100644
--- a/src/arch/x86/pseudo_inst.cc
+++ b/src/arch/x86/pseudo_inst.cc
@@ -31,9 +31,10 @@
 #include "arch/x86/pseudo_inst.hh"
 
 #include "arch/x86/system.hh"
+#include "cpu/thread_context.hh"
 #include "debug/PseudoInst.hh"
+#include "mem/se_translating_port_proxy.hh"
 #include "sim/process.hh"
-#include "sim/system.hh"
 
 using namespace X86ISA;
 
diff --git a/src/arch/x86/system.cc b/src/arch/x86/system.cc
index 25a1bd0df..ecde8366a 100644
--- a/src/arch/x86/system.cc
+++ b/src/arch/x86/system.cc
@@ -39,19 +39,12 @@
 
 #include "arch/x86/system.hh"
 
-#include "arch/vtophys.hh"
 #include "arch/x86/bios/intelmp.hh"
 #include "arch/x86/bios/smbios.hh"
 #include "arch/x86/isa_traits.hh"
-#include "arch/x86/regs/misc.hh"
-#include "base/intmath.hh"
 #include "base/loader/object_file.hh"
-#include "base/loader/symtab.hh"
-#include "base/trace.hh"
 #include "cpu/thread_context.hh"
-#include "mem/port_proxy.hh"
 #include "params/X86System.hh"
-#include "sim/byteswap.hh"
 
 using namespace LittleEndianGuest;
 using namespace X86ISA;
diff --git a/src/arch/x86/system.hh b/src/arch/x86/system.hh
index 578110a7b..45bc9651c 100644
--- a/src/arch/x86/system.hh
+++ b/src/arch/x86/system.hh
@@ -44,11 +44,7 @@
 #include <vector>
 
 #include "arch/x86/regs/misc.hh"
-#include "base/loader/symtab.hh"
-#include "cpu/pc_event.hh"
-#include "kern/system_events.hh"
 #include "params/X86System.hh"
-#include "sim/sim_object.hh"
 #include "sim/system.hh"
 
 namespace X86ISA
diff --git a/src/arch/x86/tlb.cc b/src/arch/x86/tlb.cc
index 2e24b20e5..a5e8f5524 100644
--- a/src/arch/x86/tlb.cc
+++ b/src/arch/x86/tlb.cc
@@ -45,17 +45,13 @@
 #include "arch/generic/mmapped_ipr.hh"
 #include "arch/x86/faults.hh"
 #include "arch/x86/insts/microldstop.hh"
-#include "arch/x86/pagetable.hh"
 #include "arch/x86/pagetable_walker.hh"
 #include "arch/x86/regs/misc.hh"
 #include "arch/x86/regs/msr.hh"
 #include "arch/x86/x86_traits.hh"
-#include "base/bitfield.hh"
 #include "base/trace.hh"
-#include "cpu/base.hh"
 #include "cpu/thread_context.hh"
 #include "debug/TLB.hh"
-#include "mem/packet_access.hh"
 #include "mem/page_table.hh"
 #include "mem/request.hh"
 #include "sim/full_system.hh"
diff --git a/src/arch/x86/tlb.hh b/src/arch/x86/tlb.hh
index 53f61dcbc..a134ad427 100644
--- a/src/arch/x86/tlb.hh
+++ b/src/arch/x86/tlb.hh
@@ -41,20 +41,15 @@
 #define __ARCH_X86_TLB_HH__
 
 #include <list>
-#include <string>
 #include <vector>
 
 #include "arch/generic/tlb.hh"
-#include "arch/x86/regs/segment.hh"
 #include "arch/x86/pagetable.hh"
 #include "base/trie.hh"
-#include "mem/mem_object.hh"
 #include "mem/request.hh"
 #include "params/X86TLB.hh"
-#include "sim/sim_object.hh"
 
 class ThreadContext;
-class Packet;
 
 namespace X86ISA
 {
diff --git a/src/arch/x86/utility.cc b/src/arch/x86/utility.cc
index ae0a833e6..33b53ca92 100644
--- a/src/arch/x86/utility.cc
+++ b/src/arch/x86/utility.cc
@@ -42,11 +42,10 @@
 
 #include "arch/x86/interrupts.hh"
 #include "arch/x86/registers.hh"
-#include "arch/x86/tlb.hh"
 #include "arch/x86/x86_traits.hh"
 #include "cpu/base.hh"
 #include "fputils/fp80.h"
-#include "sim/system.hh"
+#include "sim/full_system.hh"
 
 namespace X86ISA {
 
diff --git a/src/arch/x86/utility.hh b/src/arch/x86/utility.hh
index 87bed9762..87d5cbb6c 100644
--- a/src/arch/x86/utility.hh
+++ b/src/arch/x86/utility.hh
@@ -40,16 +40,10 @@
 #ifndef __ARCH_X86_UTILITY_HH__
 #define __ARCH_X86_UTILITY_HH__
 
-#include "arch/x86/regs/misc.hh"
-#include "arch/x86/types.hh"
-#include "base/misc.hh"
-#include "base/types.hh"
 #include "cpu/static_inst.hh"
 #include "cpu/thread_context.hh"
 #include "sim/full_system.hh"
 
-class ThreadContext;
-
 namespace X86ISA
 {
 
diff --git a/src/base/bitfield.hh b/src/base/bitfield.hh
index 5a98b13c7..64f192f6d 100644
--- a/src/base/bitfield.hh
+++ b/src/base/bitfield.hh
@@ -32,7 +32,7 @@
 #ifndef __BASE_BITFIELD_HH__
 #define __BASE_BITFIELD_HH__
 
-#include "base/types.hh"
+#include <inttypes.h>
 
 /**
  * Generate a 64-bit mask of 'nbits' 1s, right justified.
diff --git a/src/base/bitunion.hh b/src/base/bitunion.hh
index 35448ed24..306899563 100644
--- a/src/base/bitunion.hh
+++ b/src/base/bitunion.hh
@@ -32,7 +32,6 @@
 #define __BASE_BITUNION_HH__
 
 #include "base/bitfield.hh"
-#include "base/types.hh"
 
 //      The following implements the BitUnion system of defining bitfields
 //on top of an underlying class. This is done through the pervasive use of
diff --git a/src/base/time.cc b/src/base/time.cc
index 5ee286b9c..5509bccaf 100644
--- a/src/base/time.cc
+++ b/src/base/time.cc
@@ -35,6 +35,7 @@
 #include <iostream>
 #include <sstream>
 
+#include "base/misc.hh"
 #include "config/use_posix_clock.hh"
 #include "sim/core.hh"
 #include "sim/serialize.hh"
diff --git a/src/base/vnc/vncinput.cc b/src/base/vnc/vncinput.cc
index 5021d407a..541b77143 100644
--- a/src/base/vnc/vncinput.cc
+++ b/src/base/vnc/vncinput.cc
@@ -46,7 +46,8 @@
 
 #include <sys/types.h>
 
-#include "base/output.hh" //simout
+#include "base/misc.hh"
+#include "base/output.hh"
 #include "base/trace.hh"
 #include "debug/VNC.hh"
 
diff --git a/src/cpu/minor/buffers.hh b/src/cpu/minor/buffers.hh
index f4ae91a70..924d7d2af 100644
--- a/src/cpu/minor/buffers.hh
+++ b/src/cpu/minor/buffers.hh
@@ -50,6 +50,7 @@
 #include <queue>
 #include <sstream>
 
+#include "base/misc.hh"
 #include "cpu/minor/trace.hh"
 #include "cpu/activity.hh"
 #include "cpu/timebuf.hh"
diff --git a/src/cpu/testers/directedtest/InvalidateGenerator.cc b/src/cpu/testers/directedtest/InvalidateGenerator.cc
index 20ea4f904..c5c48f1ad 100644
--- a/src/cpu/testers/directedtest/InvalidateGenerator.cc
+++ b/src/cpu/testers/directedtest/InvalidateGenerator.cc
@@ -29,6 +29,7 @@
 
 #include "cpu/testers/directedtest/InvalidateGenerator.hh"
 
+#include "base/trace.hh"
 #include "cpu/testers/directedtest/DirectedGenerator.hh"
 #include "cpu/testers/directedtest/RubyDirectedTester.hh"
 #include "debug/DirectedTest.hh"
diff --git a/src/cpu/testers/directedtest/RubyDirectedTester.cc b/src/cpu/testers/directedtest/RubyDirectedTester.cc
index 9b4e4543c..667d50ffd 100644
--- a/src/cpu/testers/directedtest/RubyDirectedTester.cc
+++ b/src/cpu/testers/directedtest/RubyDirectedTester.cc
@@ -41,6 +41,7 @@
 
 #include "cpu/testers/directedtest/RubyDirectedTester.hh"
 
+#include "base/trace.hh"
 #include "cpu/testers/directedtest/DirectedGenerator.hh"
 #include "debug/DirectedTest.hh"
 #include "sim/sim_exit.hh"
diff --git a/src/cpu/testers/directedtest/SeriesRequestGenerator.cc b/src/cpu/testers/directedtest/SeriesRequestGenerator.cc
index 966ee4974..386a49893 100644
--- a/src/cpu/testers/directedtest/SeriesRequestGenerator.cc
+++ b/src/cpu/testers/directedtest/SeriesRequestGenerator.cc
@@ -30,6 +30,7 @@
 #include "cpu/testers/directedtest/SeriesRequestGenerator.hh"
 
 #include "base/random.hh"
+#include "base/trace.hh"
 #include "cpu/testers/directedtest/DirectedGenerator.hh"
 #include "cpu/testers/directedtest/RubyDirectedTester.hh"
 #include "debug/DirectedTest.hh"
diff --git a/src/cpu/testers/memtest/memtest.cc b/src/cpu/testers/memtest/memtest.cc
index 5dc8b7427..46387fa01 100644
--- a/src/cpu/testers/memtest/memtest.cc
+++ b/src/cpu/testers/memtest/memtest.cc
@@ -46,6 +46,7 @@
 
 #include "base/random.hh"
 #include "base/statistics.hh"
+#include "base/trace.hh"
 #include "debug/MemTest.hh"
 #include "mem/mem_object.hh"
 #include "sim/sim_exit.hh"
diff --git a/src/cpu/testers/rubytest/Check.cc b/src/cpu/testers/rubytest/Check.cc
index f685d65be..e68196c65 100644
--- a/src/cpu/testers/rubytest/Check.cc
+++ b/src/cpu/testers/rubytest/Check.cc
@@ -30,6 +30,7 @@
 #include "cpu/testers/rubytest/Check.hh"
 
 #include "base/random.hh"
+#include "base/trace.hh"
 #include "debug/RubyTest.hh"
 #include "mem/ruby/common/SubBlock.hh"
 
diff --git a/src/cpu/testers/rubytest/CheckTable.cc b/src/cpu/testers/rubytest/CheckTable.cc
index 54248095b..843a7cf9d 100644
--- a/src/cpu/testers/rubytest/CheckTable.cc
+++ b/src/cpu/testers/rubytest/CheckTable.cc
@@ -31,6 +31,7 @@
 
 #include "base/intmath.hh"
 #include "base/random.hh"
+#include "base/trace.hh"
 #include "cpu/testers/rubytest/Check.hh"
 #include "debug/RubyTest.hh"
 
diff --git a/src/cpu/testers/rubytest/RubyTester.cc b/src/cpu/testers/rubytest/RubyTester.cc
index 61de05235..baf2b7e5b 100644
--- a/src/cpu/testers/rubytest/RubyTester.cc
+++ b/src/cpu/testers/rubytest/RubyTester.cc
@@ -42,6 +42,7 @@
 #include "cpu/testers/rubytest/RubyTester.hh"
 
 #include "base/misc.hh"
+#include "base/trace.hh"
 #include "cpu/testers/rubytest/Check.hh"
 #include "debug/RubyTest.hh"
 #include "mem/ruby/common/SubBlock.hh"
diff --git a/src/dev/arm/flash_device.cc b/src/dev/arm/flash_device.cc
index 63d232e80..3dc8d5bd2 100644
--- a/src/dev/arm/flash_device.cc
+++ b/src/dev/arm/flash_device.cc
@@ -54,6 +54,7 @@
 
 #include "dev/arm/flash_device.hh"
 
+#include "base/trace.hh"
 #include "debug/Drain.hh"
 
 /**
diff --git a/src/dev/mc146818.hh b/src/dev/mc146818.hh
index e19040ec3..8eb301c45 100644
--- a/src/dev/mc146818.hh
+++ b/src/dev/mc146818.hh
@@ -34,6 +34,7 @@
 #define __DEV_MC146818_HH__
 
 #include "base/bitunion.hh"
+#include "base/misc.hh"
 #include "sim/eventq_impl.hh"
 
 /** Real-Time Clock (MC146818) */
diff --git a/src/dev/net/dist_iface.hh b/src/dev/net/dist_iface.hh
index a56b9a3bb..c02c39530 100644
--- a/src/dev/net/dist_iface.hh
+++ b/src/dev/net/dist_iface.hh
@@ -83,6 +83,7 @@
 #include <thread>
 #include <utility>
 
+#include "base/misc.hh"
 #include "dev/net/dist_packet.hh"
 #include "dev/net/etherpkt.hh"
 #include "sim/core.hh"
diff --git a/src/dev/net/etherbus.cc b/src/dev/net/etherbus.cc
index 042c4ec84..7ccb8a4ac 100644
--- a/src/dev/net/etherbus.cc
+++ b/src/dev/net/etherbus.cc
@@ -38,6 +38,7 @@
 #include <string>
 #include <vector>
 
+#include "base/misc.hh"
 #include "base/trace.hh"
 #include "debug/Ethernet.hh"
 #include "debug/EthernetData.hh"
diff --git a/src/dev/net/etherswitch.cc b/src/dev/net/etherswitch.cc
index c9698cf63..995e29a0c 100644
--- a/src/dev/net/etherswitch.cc
+++ b/src/dev/net/etherswitch.cc
@@ -36,7 +36,9 @@
 #include "dev/net/etherswitch.hh"
 
 #include "base/random.hh"
+#include "base/trace.hh"
 #include "debug/EthernetAll.hh"
+#include "sim/core.hh"
 
 using namespace std;
 
diff --git a/src/gpu-compute/vector_register_file.hh b/src/gpu-compute/vector_register_file.hh
index 360b2fb3c..0842c3695 100644
--- a/src/gpu-compute/vector_register_file.hh
+++ b/src/gpu-compute/vector_register_file.hh
@@ -39,6 +39,7 @@
 #include <list>
 
 #include "base/statistics.hh"
+#include "base/trace.hh"
 #include "base/types.hh"
 #include "debug/GPUVRF.hh"
 #include "gpu-compute/vector_register_state.hh"
diff --git a/src/kern/linux/linux.cc b/src/kern/linux/linux.cc
index ef5b4417f..6618fdbd9 100644
--- a/src/kern/linux/linux.cc
+++ b/src/kern/linux/linux.cc
@@ -33,7 +33,6 @@
 #include <cstdio>
 #include <string>
 
-#include "cpu/thread_context.hh"
 #include "debug/SyscallVerbose.hh"
 #include "sim/process.hh"
 #include "sim/system.hh"
diff --git a/src/kern/linux/linux.hh b/src/kern/linux/linux.hh
index 783341948..52a3bcd7b 100644
--- a/src/kern/linux/linux.hh
+++ b/src/kern/linux/linux.hh
@@ -36,9 +36,9 @@
 #include <string>
 
 #include "kern/operatingsystem.hh"
+#include "sim/process.hh"
 
 class ThreadContext;
-class LiveProcess;
 
 ///
 /// This class encapsulates the types, structures, constants,
diff --git a/src/mem/cache/prefetch/stride.cc b/src/mem/cache/prefetch/stride.cc
index e9c83f2ff..f2679a292 100644
--- a/src/mem/cache/prefetch/stride.cc
+++ b/src/mem/cache/prefetch/stride.cc
@@ -49,6 +49,7 @@
 #include "mem/cache/prefetch/stride.hh"
 
 #include "base/random.hh"
+#include "base/trace.hh"
 #include "debug/HWPrefetch.hh"
 
 StridePrefetcher::StridePrefetcher(const StridePrefetcherParams *p)
diff --git a/src/mem/external_master.cc b/src/mem/external_master.cc
index 94fdc39cf..143019950 100644
--- a/src/mem/external_master.cc
+++ b/src/mem/external_master.cc
@@ -43,6 +43,7 @@
 #include <cctype>
 #include <iomanip>
 
+#include "base/trace.hh"
 #include "debug/ExternalPort.hh"
 
 std::map<std::string, ExternalMaster::Handler *>
diff --git a/src/mem/external_slave.cc b/src/mem/external_slave.cc
index 2d7ba1a65..990e3561a 100644
--- a/src/mem/external_slave.cc
+++ b/src/mem/external_slave.cc
@@ -42,6 +42,7 @@
 #include <cctype>
 #include <iomanip>
 
+#include "base/trace.hh"
 #include "debug/ExternalPort.hh"
 
 /** Implement a `stub' port which just responds to requests by printing
diff --git a/src/mem/mem_checker.hh b/src/mem/mem_checker.hh
index 6ceca74a7..7de4c17b7 100644
--- a/src/mem/mem_checker.hh
+++ b/src/mem/mem_checker.hh
@@ -48,6 +48,7 @@
 #include <vector>
 
 #include "base/misc.hh"
+#include "base/trace.hh"
 #include "base/types.hh"
 #include "debug/MemChecker.hh"
 #include "params/MemChecker.hh"
diff --git a/src/mem/multi_level_page_table.hh b/src/mem/multi_level_page_table.hh
index a1d3fbc39..a69d6ce7f 100644
--- a/src/mem/multi_level_page_table.hh
+++ b/src/mem/multi_level_page_table.hh
@@ -38,13 +38,12 @@
 
 #include <string>
 
-#include "arch/isa_traits.hh"
 #include "arch/tlb.hh"
 #include "base/types.hh"
 #include "config/the_isa.hh"
 #include "mem/page_table.hh"
-#include "sim/serialize.hh"
-#include "sim/system.hh"
+
+class System;
 
 /**
  * This class implements an in-memory multi-level page table that can be
diff --git a/src/mem/multi_level_page_table_impl.hh b/src/mem/multi_level_page_table_impl.hh
index 610240562..07ac92406 100644
--- a/src/mem/multi_level_page_table_impl.hh
+++ b/src/mem/multi_level_page_table_impl.hh
@@ -32,18 +32,15 @@
  * @file
  * Definitions of page table
  */
-#include <fstream>
-#include <map>
 #include <string>
 
-#include "base/bitfield.hh"
-#include "base/intmath.hh"
+#include "arch/isa_traits.hh"
+#include "arch/tlb.hh"
 #include "base/trace.hh"
 #include "config/the_isa.hh"
 #include "debug/MMU.hh"
 #include "mem/multi_level_page_table.hh"
-#include "sim/faults.hh"
-#include "sim/sim_object.hh"
+#include "mem/page_table.hh"
 
 using namespace std;
 using namespace TheISA;
diff --git a/src/mem/page_table.cc b/src/mem/page_table.cc
index f47227f5a..8ff640837 100644
--- a/src/mem/page_table.cc
+++ b/src/mem/page_table.cc
@@ -37,18 +37,13 @@
  */
 #include "mem/page_table.hh"
 
-#include <fstream>
-#include <map>
-#include <memory>
 #include <string>
 
-#include "base/bitfield.hh"
-#include "base/intmath.hh"
 #include "base/trace.hh"
 #include "config/the_isa.hh"
 #include "debug/MMU.hh"
 #include "sim/faults.hh"
-#include "sim/sim_object.hh"
+#include "sim/serialize.hh"
 
 using namespace std;
 using namespace TheISA;
diff --git a/src/mem/page_table.hh b/src/mem/page_table.hh
index 645548263..9b24c0efa 100644
--- a/src/mem/page_table.hh
+++ b/src/mem/page_table.hh
@@ -42,13 +42,14 @@
 
 #include "arch/isa_traits.hh"
 #include "arch/tlb.hh"
+#include "base/intmath.hh"
 #include "base/types.hh"
 #include "config/the_isa.hh"
 #include "mem/request.hh"
 #include "sim/serialize.hh"
-#include "sim/system.hh"
 
 class ThreadContext;
+class System;
 
 /**
  * Declaration of base class for page table
diff --git a/src/mem/ruby/network/MessageBuffer.hh b/src/mem/ruby/network/MessageBuffer.hh
index e6ec5ac4b..6694830b0 100644
--- a/src/mem/ruby/network/MessageBuffer.hh
+++ b/src/mem/ruby/network/MessageBuffer.hh
@@ -41,6 +41,7 @@
 #include <string>
 #include <vector>
 
+#include "base/trace.hh"
 #include "debug/RubyQueue.hh"
 #include "mem/ruby/common/Address.hh"
 #include "mem/ruby/common/Consumer.hh"
diff --git a/src/mem/ruby/structures/AbstractReplacementPolicy.cc b/src/mem/ruby/structures/AbstractReplacementPolicy.cc
index 5abd55083..05304dc84 100644
--- a/src/mem/ruby/structures/AbstractReplacementPolicy.cc
+++ b/src/mem/ruby/structures/AbstractReplacementPolicy.cc
@@ -30,6 +30,8 @@
 
 #include "mem/ruby/structures/AbstractReplacementPolicy.hh"
 
+#include "base/misc.hh"
+
 AbstractReplacementPolicy::AbstractReplacementPolicy(const Params * p)
   : SimObject(p)
 {
diff --git a/src/mem/se_translating_port_proxy.hh b/src/mem/se_translating_port_proxy.hh
index 58d0c9bcd..bb823a75b 100644
--- a/src/mem/se_translating_port_proxy.hh
+++ b/src/mem/se_translating_port_proxy.hh
@@ -45,9 +45,9 @@
 #ifndef __MEM_SE_TRANSLATING_PORT_PROXY_HH__
 #define __MEM_SE_TRANSLATING_PORT_PROXY_HH__
 
-#include "mem/page_table.hh"
 #include "mem/port_proxy.hh"
 
+class PageTableBase;
 class Process;
 
 /**
diff --git a/src/mem/simple_mem.cc b/src/mem/simple_mem.cc
index f3a01b5b0..f524d01ab 100644
--- a/src/mem/simple_mem.cc
+++ b/src/mem/simple_mem.cc
@@ -45,6 +45,7 @@
 #include "mem/simple_mem.hh"
 
 #include "base/random.hh"
+#include "base/trace.hh"
 #include "debug/Drain.hh"
 
 using namespace std;
diff --git a/src/python/swig/pyevent.cc b/src/python/swig/pyevent.cc
index 24760fc65..53f3a3397 100644
--- a/src/python/swig/pyevent.cc
+++ b/src/python/swig/pyevent.cc
@@ -32,6 +32,7 @@
 
 #include <Python.h>
 
+#include "base/misc.hh"
 #include "sim/async.hh"
 #include "sim/eventq.hh"
 
diff --git a/src/sim/SConscript b/src/sim/SConscript
index 61e4df966..7fec029f1 100644
--- a/src/sim/SConscript
+++ b/src/sim/SConscript
@@ -82,6 +82,9 @@ if env['TARGET_ISA'] != 'null':
     Source('syscall_emul.cc')
     Source('syscall_desc.cc')
 
+if env['TARGET_ISA'] != 'x86':
+    Source('microcode_rom.cc')
+
 DebugFlag('Checkpoint')
 DebugFlag('Config')
 DebugFlag('CxxConfig')
diff --git a/src/sim/arguments.cc b/src/sim/arguments.cc
index 5d6ded9ee..4d00d2cf6 100644
--- a/src/sim/arguments.cc
+++ b/src/sim/arguments.cc
@@ -32,7 +32,6 @@
 
 #include "arch/utility.hh"
 #include "config/the_isa.hh"
-#include "cpu/thread_context.hh"
 
 Arguments::Data::~Data()
 {
diff --git a/src/sim/arguments.hh b/src/sim/arguments.hh
index 165880095..498527ca2 100644
--- a/src/sim/arguments.hh
+++ b/src/sim/arguments.hh
@@ -34,7 +34,6 @@
 #include <cassert>
 #include <memory>
 
-#include "base/types.hh"
 #include "mem/fs_translating_port_proxy.hh"
 
 class ThreadContext;
diff --git a/src/sim/byteswap.hh b/src/sim/byteswap.hh
index 7e5d6809e..23786bb71 100644
--- a/src/sim/byteswap.hh
+++ b/src/sim/byteswap.hh
@@ -38,7 +38,6 @@
 #define __SIM_BYTE_SWAP_HH__
 
 #include "base/bigint.hh"
-#include "base/misc.hh"
 #include "base/types.hh"
 
 // This lets us figure out what the byte order of the host system is
diff --git a/src/sim/clock_domain.cc b/src/sim/clock_domain.cc
index 5b05ced9b..46dbcbaac 100644
--- a/src/sim/clock_domain.cc
+++ b/src/sim/clock_domain.cc
@@ -47,6 +47,7 @@
 #include <algorithm>
 #include <functional>
 
+#include "base/trace.hh"
 #include "debug/ClockDomain.hh"
 #include "params/ClockDomain.hh"
 #include "params/DerivedClockDomain.hh"
diff --git a/src/sim/clocked_object.hh b/src/sim/clocked_object.hh
index d85d226c9..b89e1ce13 100644
--- a/src/sim/clocked_object.hh
+++ b/src/sim/clocked_object.hh
@@ -51,7 +51,6 @@
 
 #include "base/callback.hh"
 #include "base/intmath.hh"
-#include "base/misc.hh"
 #include "enums/PwrState.hh"
 #include "params/ClockedObject.hh"
 #include "sim/core.hh"
diff --git a/src/sim/cxx_config.hh b/src/sim/cxx_config.hh
index da2752b4b..8860e0297 100644
--- a/src/sim/cxx_config.hh
+++ b/src/sim/cxx_config.hh
@@ -57,8 +57,6 @@
 #include <string>
 #include <vector>
 
-#include "mem/port.hh"
-#include "params/SimObject.hh"
 #include "sim/sim_object.hh"
 
 class CxxConfigParams;
diff --git a/src/sim/cxx_config_ini.cc b/src/sim/cxx_config_ini.cc
index 3df6d72d4..41ad8e6f5 100644
--- a/src/sim/cxx_config_ini.cc
+++ b/src/sim/cxx_config_ini.cc
@@ -39,6 +39,8 @@
 
 #include "sim/cxx_config_ini.hh"
 
+#include "base/str.hh"
+
 bool
 CxxIniFile::getParam(const std::string &object_name,
     const std::string &param_name,
diff --git a/src/sim/cxx_config_ini.hh b/src/sim/cxx_config_ini.hh
index 9ea61976e..84900a62e 100644
--- a/src/sim/cxx_config_ini.hh
+++ b/src/sim/cxx_config_ini.hh
@@ -47,7 +47,6 @@
 #define __SIM_CXX_CONFIG_INI_HH__
 
 #include "base/inifile.hh"
-#include "base/str.hh"
 #include "sim/cxx_config.hh"
 
 /** CxxConfigManager interface for using .ini files */
diff --git a/src/sim/cxx_manager.cc b/src/sim/cxx_manager.cc
index a679c6105..bb6c6a807 100644
--- a/src/sim/cxx_manager.cc
+++ b/src/sim/cxx_manager.cc
@@ -43,6 +43,7 @@
 #include <sstream>
 
 #include "base/str.hh"
+#include "base/trace.hh"
 #include "debug/CxxConfig.hh"
 #include "mem/mem_object.hh"
 #include "sim/serialize.hh"
diff --git a/src/sim/drain.hh b/src/sim/drain.hh
index 370217bd6..b3145e7ed 100644
--- a/src/sim/drain.hh
+++ b/src/sim/drain.hh
@@ -44,8 +44,6 @@
 #include <mutex>
 #include <unordered_set>
 
-#include "base/flags.hh"
-
 class Drainable;
 
 #ifndef SWIG // SWIG doesn't support strongly typed enums
diff --git a/src/sim/dvfs_handler.cc b/src/sim/dvfs_handler.cc
index 254720c5f..5ccd50bcd 100644
--- a/src/sim/dvfs_handler.cc
+++ b/src/sim/dvfs_handler.cc
@@ -45,9 +45,11 @@
 #include <utility>
 
 #include "base/misc.hh"
+#include "base/trace.hh"
 #include "debug/DVFS.hh"
 #include "params/DVFSHandler.hh"
 #include "sim/clock_domain.hh"
+#include "sim/eventq_impl.hh"
 #include "sim/stat_control.hh"
 #include "sim/voltage_domain.hh"
 
@@ -170,6 +172,30 @@ DVFSHandler::UpdateEvent::updatePerfLevel()
     d->perfLevel(perfLevelToSet);
 }
 
+double
+DVFSHandler::voltageAtPerfLevel(DomainID domain_id, PerfLevel perf_level) const
+{
+    VoltageDomain *d = findDomain(domain_id)->voltageDomain();
+    assert(d);
+    PerfLevel n = d->numVoltages();
+    if (perf_level < n)
+        return d->voltage(perf_level);
+
+    // Request outside of the range of the voltage domain
+    if (n == 1) {
+        DPRINTF(DVFS, "DVFS: Request for perf-level %i for single-point "\
+                "voltage domain %s.  Returning voltage at level 0: %.2f "\
+                "V\n", perf_level, d->name(), d->voltage(0));
+        // Special case for single point voltage domain -> same voltage for
+        // all points
+        return d->voltage(0);
+    }
+
+    warn("DVFSHandler %s reads illegal voltage level %u from "\
+         "VoltageDomain %s. Returning 0 V\n", name(), perf_level, d->name());
+    return 0.;
+}
+
 void
 DVFSHandler::serialize(CheckpointOut &cp) const
 {
diff --git a/src/sim/dvfs_handler.hh b/src/sim/dvfs_handler.hh
index f587f7c25..23ac4bf50 100644
--- a/src/sim/dvfs_handler.hh
+++ b/src/sim/dvfs_handler.hh
@@ -53,13 +53,10 @@
 #include <vector>
 
 #include "debug/DVFS.hh"
-#include "params/ClockDomain.hh"
 #include "params/DVFSHandler.hh"
-#include "params/VoltageDomain.hh"
 #include "sim/clock_domain.hh"
 #include "sim/eventq.hh"
 #include "sim/sim_object.hh"
-#include "sim/voltage_domain.hh"
 
 /**
  * DVFS Handler class, maintains a list of all the domains it can handle.
@@ -156,28 +153,7 @@ class DVFSHandler : public SimObject
      * @return Voltage for the requested performance level of the respective
      * domain
      */
-    double voltageAtPerfLevel(DomainID domain_id, PerfLevel perf_level) const
-    {
-        VoltageDomain *d = findDomain(domain_id)->voltageDomain();
-        assert(d);
-        PerfLevel n = d->numVoltages();
-        if (perf_level < n)
-            return d->voltage(perf_level);
-
-        // Request outside of the range of the voltage domain
-        if (n == 1) {
-            DPRINTF(DVFS, "DVFS: Request for perf-level %i for single-point "\
-                    "voltage domain %s.  Returning voltage at level 0: %.2f "\
-                    "V\n", perf_level, d->name(), d->voltage(0));
-            // Special case for single point voltage domain -> same voltage for
-            // all points
-            return d->voltage(0);
-        }
-
-        warn("DVFSHandler %s reads illegal voltage level %u from "\
-             "VoltageDomain %s. Returning 0 V\n", name(), perf_level, d->name());
-        return 0.;
-    }
+    double voltageAtPerfLevel(DomainID domain_id, PerfLevel perf_level) const;
 
     /**
      * Get the total number of available performance levels.
diff --git a/src/sim/eventq.hh b/src/sim/eventq.hh
index eeb392153..0b76491ca 100644
--- a/src/sim/eventq.hh
+++ b/src/sim/eventq.hh
@@ -47,7 +47,6 @@
 #include <string>
 
 #include "base/flags.hh"
-#include "base/misc.hh"
 #include "base/types.hh"
 #include "debug/Event.hh"
 #include "sim/serialize.hh"
diff --git a/src/sim/fd_entry.hh b/src/sim/fd_entry.hh
index 0cbb769b5..fd68ba50b 100644
--- a/src/sim/fd_entry.hh
+++ b/src/sim/fd_entry.hh
@@ -35,7 +35,9 @@
 #include <ostream>
 #include <string>
 
-#include "sim/emul_driver.hh"
+#include "sim/serialize.hh"
+
+class EmulatedDriver;
 
 /**
  * FDEntry is used to manage a single file descriptor mapping and metadata
diff --git a/src/sim/init_signals.cc b/src/sim/init_signals.cc
index 81dba189b..5acfe45fd 100644
--- a/src/sim/init_signals.cc
+++ b/src/sim/init_signals.cc
@@ -52,6 +52,7 @@
 
 #include "base/atomicio.hh"
 #include "base/cprintf.hh"
+#include "base/misc.hh"
 #include "sim/async.hh"
 #include "sim/backtrace.hh"
 #include "sim/core.hh"
diff --git a/src/sim/insttracer.hh b/src/sim/insttracer.hh
index 7b15d1f91..caeee520d 100644
--- a/src/sim/insttracer.hh
+++ b/src/sim/insttracer.hh
@@ -45,9 +45,8 @@
 #define __INSTRECORD_HH__
 
 #include "base/bigint.hh"
-#include "base/trace.hh"
 #include "base/types.hh"
-#include "cpu/inst_seq.hh"      // for InstSeqNum
+#include "cpu/inst_seq.hh"
 #include "cpu/static_inst.hh"
 #include "sim/sim_object.hh"
 
diff --git a/src/sim/microcode_rom.cc b/src/sim/microcode_rom.cc
new file mode 100644
index 000000000..d050919e7
--- /dev/null
+++ b/src/sim/microcode_rom.cc
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2008 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#include "sim/microcode_rom.hh"
+
+#include "base/misc.hh"
+#include "cpu/static_inst_fwd.hh"
+
+StaticInstPtr
+MicrocodeRom::fetchMicroop(MicroPC micropc, StaticInstPtr curMacroop)
+{
+    panic("ROM based microcode isn't implemented.\n");
+}
diff --git a/src/sim/microcode_rom.hh b/src/sim/microcode_rom.hh
index be10de86b..d45c0870a 100644
--- a/src/sim/microcode_rom.hh
+++ b/src/sim/microcode_rom.hh
@@ -36,17 +36,16 @@
  * anything more.
  */
 
-#include "base/misc.hh"
-#include "cpu/static_inst.hh"
+#include <inttypes.h>
+
+#include "cpu/static_inst_fwd.hh"
+
+typedef uint16_t MicroPC;
 
 class MicrocodeRom
 {
   public:
-    StaticInstPtr
-    fetchMicroop(MicroPC micropc, StaticInstPtr curMacroop)
-    {
-        panic("ROM based microcode isn't implemented.\n");
-    }
+    StaticInstPtr fetchMicroop(MicroPC micropc, StaticInstPtr curMacroop);
 };
 
 #endif // __SIM_MICROCODE_ROM_HH__
diff --git a/src/sim/power/mathexpr_powermodel.hh b/src/sim/power/mathexpr_powermodel.hh
index 563b1fa7f..5c121c7b6 100644
--- a/src/sim/power/mathexpr_powermodel.hh
+++ b/src/sim/power/mathexpr_powermodel.hh
@@ -42,11 +42,13 @@
 
 #include <unordered_map>
 
-#include "base/statistics.hh"
 #include "params/MathExprPowerModel.hh"
 #include "sim/mathexpr.hh"
 #include "sim/power/power_model.hh"
-#include "sim/sim_object.hh"
+
+namespace Stats {
+    class Info;
+}
 
 /**
  * A Equation power model. The power is represented as a combination
diff --git a/src/sim/power/power_model.cc b/src/sim/power/power_model.cc
index bd06ced70..5f810fe60 100644
--- a/src/sim/power/power_model.cc
+++ b/src/sim/power/power_model.cc
@@ -42,7 +42,7 @@
 #include "base/statistics.hh"
 #include "params/PowerModel.hh"
 #include "params/PowerModelState.hh"
-#include "sim/sim_object.hh"
+#include "sim/clocked_object.hh"
 #include "sim/sub_system.hh"
 
 PowerModelState::PowerModelState(const Params *p)
diff --git a/src/sim/power/power_model.hh b/src/sim/power/power_model.hh
index a2ddcea18..976c0543f 100644
--- a/src/sim/power/power_model.hh
+++ b/src/sim/power/power_model.hh
@@ -43,9 +43,10 @@
 #include "base/statistics.hh"
 #include "params/PowerModel.hh"
 #include "params/PowerModelState.hh"
-#include "sim/power/thermal_model.hh"
 #include "sim/probe/probe.hh"
-#include "sim/sim_object.hh"
+
+class SimObject;
+class ClockedObject;
 
 /**
  * A PowerModelState is an abstract class used as interface to get power
diff --git a/src/sim/power/thermal_domain.cc b/src/sim/power/thermal_domain.cc
index 11f48371e..0724ee80f 100644
--- a/src/sim/power/thermal_domain.cc
+++ b/src/sim/power/thermal_domain.cc
@@ -44,8 +44,11 @@
 #include "base/statistics.hh"
 #include "debug/ThermalDomain.hh"
 #include "params/ThermalDomain.hh"
+#include "sim/clocked_object.hh"
+#include "sim/linear_solver.hh"
 #include "sim/power/thermal_model.hh"
-#include "sim/sim_object.hh"
+#include "sim/probe/probe.hh"
+#include "sim/sub_system.hh"
 
 ThermalDomain::ThermalDomain(const Params *p)
     : SimObject(p), _initTemperature(p->initial_temperature),
diff --git a/src/sim/power/thermal_domain.hh b/src/sim/power/thermal_domain.hh
index 9236a2437..f385994f8 100644
--- a/src/sim/power/thermal_domain.hh
+++ b/src/sim/power/thermal_domain.hh
@@ -45,11 +45,11 @@
 #include "base/statistics.hh"
 #include "params/ThermalDomain.hh"
 #include "sim/power/thermal_entity.hh"
-#include "sim/probe/probe.hh"
 #include "sim/sim_object.hh"
-#include "sim/sub_system.hh"
 
+class SubSystem;
 class ThermalNode;
+template <class T> class ProbePointArg;
 
 /**
  * A ThermalDomain is used to group objects under that operate under
diff --git a/src/sim/power/thermal_entity.hh b/src/sim/power/thermal_entity.hh
index 77846b67a..fb703961f 100644
--- a/src/sim/power/thermal_entity.hh
+++ b/src/sim/power/thermal_entity.hh
@@ -40,8 +40,7 @@
 #ifndef __SIM_THERMAL_ENTITY_HH__
 #define __SIM_THERMAL_ENTITY_HH__
 
-#include "sim/linear_solver.hh"
-
+class LinearEquation;
 class ThermalNode;
 
 /**
diff --git a/src/sim/power/thermal_model.hh b/src/sim/power/thermal_model.hh
index 64f831982..32f34f109 100644
--- a/src/sim/power/thermal_model.hh
+++ b/src/sim/power/thermal_model.hh
@@ -42,7 +42,6 @@
 
 #include <vector>
 
-#include "base/statistics.hh"
 #include "params/ThermalCapacitor.hh"
 #include "params/ThermalModel.hh"
 #include "params/ThermalReference.hh"
diff --git a/src/sim/probe/probe.cc b/src/sim/probe/probe.cc
index 5f20f7861..f0522bef9 100644
--- a/src/sim/probe/probe.cc
+++ b/src/sim/probe/probe.cc
@@ -40,6 +40,7 @@
 #include "sim/probe/probe.hh"
 
 #include "debug/ProbeVerbose.hh"
+#include "params/ProbeListenerObject.hh"
 
 ProbePoint::ProbePoint(ProbeManager *manager, const std::string& _name)
     : name(_name)
diff --git a/src/sim/probe/probe.hh b/src/sim/probe/probe.hh
index 8f68c0441..e391f016b 100644
--- a/src/sim/probe/probe.hh
+++ b/src/sim/probe/probe.hh
@@ -64,13 +64,14 @@
 #include <string>
 #include <vector>
 
+#include "base/compiler.hh"
 #include "base/trace.hh"
-#include "params/ProbeListenerObject.hh"
 #include "sim/sim_object.hh"
 
 /** Forward declare the ProbeManager. */
 class ProbeManager;
 class ProbeListener;
+class ProbeListenerObjectParams;
 
 /**
  * Name space containing shared probe point declarations.
diff --git a/src/sim/process.cc b/src/sim/process.cc
index bead9d362..560870c96 100644
--- a/src/sim/process.cc
+++ b/src/sim/process.cc
@@ -48,9 +48,10 @@
 #include <fcntl.h>
 #include <unistd.h>
 
-#include <cstdio>
+#include <array>
 #include <map>
 #include <string>
+#include <vector>
 
 #include "base/intmath.hh"
 #include "base/loader/object_file.hh"
@@ -58,14 +59,11 @@
 #include "base/statistics.hh"
 #include "config/the_isa.hh"
 #include "cpu/thread_context.hh"
-#include "mem/multi_level_page_table.hh"
 #include "mem/page_table.hh"
 #include "mem/se_translating_port_proxy.hh"
 #include "params/LiveProcess.hh"
 #include "params/Process.hh"
-#include "sim/debug.hh"
-#include "sim/process_impl.hh"
-#include "sim/stats.hh"
+#include "sim/emul_driver.hh"
 #include "sim/syscall_desc.hh"
 #include "sim/system.hh"
 
diff --git a/src/sim/process.hh b/src/sim/process.hh
index d9762c052..30852f6af 100644
--- a/src/sim/process.hh
+++ b/src/sim/process.hh
@@ -34,6 +34,7 @@
 #define __PROCESS_HH__
 
 #include <array>
+#include <map>
 #include <string>
 #include <vector>
 
@@ -44,15 +45,16 @@
 #include "mem/se_translating_port_proxy.hh"
 #include "sim/fd_entry.hh"
 #include "sim/sim_object.hh"
-#include "sim/syscall_return.hh"
 
-class PageTable;
-struct ProcessParams;
 struct LiveProcessParams;
+struct ProcessParams;
+
+class EmulatedDriver;
+class PageTableBase;
 class SyscallDesc;
+class SyscallReturn;
 class System;
 class ThreadContext;
-class EmulatedDriver;
 
 template<class IntType>
 struct AuxVector
diff --git a/src/sim/process_impl.hh b/src/sim/process_impl.hh
index b1905834b..3f3d6ae15 100644
--- a/src/sim/process_impl.hh
+++ b/src/sim/process_impl.hh
@@ -36,7 +36,6 @@
 #include <vector>
 
 #include "mem/se_translating_port_proxy.hh"
-#include "sim/byteswap.hh"
 
 //This needs to be templated for cases where 32 bit pointers are needed.
 template<class AddrType>
diff --git a/src/sim/root.cc b/src/sim/root.cc
index 6787564dd..752632b5e 100644
--- a/src/sim/root.cc
+++ b/src/sim/root.cc
@@ -31,13 +31,13 @@
  *          Gabe Black
  */
 
-#include "sim/root.hh"
-
 #include "base/misc.hh"
 #include "base/trace.hh"
 #include "config/the_isa.hh"
 #include "debug/TimeSync.hh"
+#include "sim/eventq_impl.hh"
 #include "sim/full_system.hh"
+#include "sim/root.hh"
 
 Root *Root::_root = NULL;
 
diff --git a/src/sim/serialize.hh b/src/sim/serialize.hh
index 4c5e9d79c..1005d5b97 100644
--- a/src/sim/serialize.hh
+++ b/src/sim/serialize.hh
@@ -59,14 +59,12 @@
 #include <vector>
 
 #include "base/bitunion.hh"
-#include "base/types.hh"
 
+class CheckpointIn;
 class IniFile;
 class Serializable;
-class CheckpointIn;
 class SimObject;
 class SimObjectResolver;
-class EventQueue;
 
 typedef std::ostream CheckpointOut;
 
diff --git a/src/sim/sim_exit.hh b/src/sim/sim_exit.hh
index 218db9aeb..55db55ff2 100644
--- a/src/sim/sim_exit.hh
+++ b/src/sim/sim_exit.hh
@@ -35,7 +35,8 @@
 #include <string>
 
 #include "base/types.hh"
-#include "sim/core.hh"
+
+Tick curTick();
 
 // forward declaration
 class Callback;
diff --git a/src/sim/sim_object.cc b/src/sim/sim_object.cc
index 0ccc36b35..516019a7c 100644
--- a/src/sim/sim_object.cc
+++ b/src/sim/sim_object.cc
@@ -32,17 +32,11 @@
 
 #include "sim/sim_object.hh"
 
-#include <cassert>
-
-#include "base/callback.hh"
-#include "base/inifile.hh"
 #include "base/match.hh"
 #include "base/misc.hh"
 #include "base/trace.hh"
-#include "base/types.hh"
 #include "debug/Checkpoint.hh"
 #include "sim/probe/probe.hh"
-#include "sim/stats.hh"
 
 using namespace std;
 
diff --git a/src/sim/sim_object.hh b/src/sim/sim_object.hh
index 7c1452f01..42a19bbe7 100644
--- a/src/sim/sim_object.hh
+++ b/src/sim/sim_object.hh
@@ -49,21 +49,18 @@
 #ifndef __SIM_OBJECT_HH__
 #define __SIM_OBJECT_HH__
 
-#include <iostream>
-#include <list>
-#include <map>
 #include <string>
 #include <vector>
 
-#include "enums/MemoryMode.hh"
 #include "params/SimObject.hh"
 #include "sim/drain.hh"
+#include "sim/eventq.hh"
 #include "sim/eventq_impl.hh"
 #include "sim/serialize.hh"
 
-class BaseCPU;
-class Event;
+class EventManager;
 class ProbeManager;
+
 /**
  * Abstract superclass for simulation objects.  Represents things that
  * correspond to physical components and can be specified via the
diff --git a/src/sim/simulate.hh b/src/sim/simulate.hh
index 85d58e119..e39a2595d 100644
--- a/src/sim/simulate.hh
+++ b/src/sim/simulate.hh
@@ -30,7 +30,8 @@
  */
 
 #include "base/types.hh"
-#include "sim/sim_events.hh"
+
+class GlobalSimLoopExitEvent;
 
 GlobalSimLoopExitEvent *simulate(Tick num_cycles = MaxTick);
 extern GlobalSimLoopExitEvent *simulate_limit_event;
diff --git a/src/sim/stat_register.cc b/src/sim/stat_register.cc
index ef7ff8216..371fd9621 100644
--- a/src/sim/stat_register.cc
+++ b/src/sim/stat_register.cc
@@ -39,6 +39,8 @@
 
 #include "sim/stat_register.hh"
 
+#include "base/statistics.hh"
+
 namespace Stats
 {
 
diff --git a/src/sim/stat_register.hh b/src/sim/stat_register.hh
index 7f8c3bcd9..bbe909321 100644
--- a/src/sim/stat_register.hh
+++ b/src/sim/stat_register.hh
@@ -44,8 +44,6 @@
 #ifndef __SIM_STAT_REGISTER_H__
 #define __SIM_STAT_REGISTER_H__
 
-#include "base/statistics.hh"
-
 namespace Stats
 {
 
diff --git a/src/sim/sub_system.hh b/src/sim/sub_system.hh
index 20a352fc3..e2e75be52 100644
--- a/src/sim/sub_system.hh
+++ b/src/sim/sub_system.hh
@@ -48,7 +48,6 @@
 #include <vector>
 
 #include "params/SubSystem.hh"
-#include "sim/power/thermal_domain.hh"
 #include "sim/sim_object.hh"
 
 class PowerModel;
diff --git a/src/sim/syscall_emul.cc b/src/sim/syscall_emul.cc
index b34e983a6..56518726c 100644
--- a/src/sim/syscall_emul.cc
+++ b/src/sim/syscall_emul.cc
@@ -34,7 +34,6 @@
 #include <fcntl.h>
 #include <unistd.h>
 
-#include <cstdio>
 #include <iostream>
 #include <string>
 
@@ -42,7 +41,6 @@
 #include "base/chunk_generator.hh"
 #include "base/trace.hh"
 #include "config/the_isa.hh"
-#include "cpu/base.hh"
 #include "cpu/thread_context.hh"
 #include "mem/page_table.hh"
 #include "sim/process.hh"
diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh
index 4433b5039..31e4c07cd 100644
--- a/src/sim/syscall_emul.hh
+++ b/src/sim/syscall_emul.hh
@@ -62,7 +62,7 @@
 /// application on the host machine.
 
 #ifdef __CYGWIN32__
-#include <sys/fcntl.h>  // for O_BINARY
+#include <sys/fcntl.h>
 
 #endif
 #include <fcntl.h>
@@ -78,8 +78,7 @@
 #include <cerrno>
 #include <string>
 
-#include "base/chunk_generator.hh"
-#include "base/intmath.hh"      // for RoundUp
+#include "base/intmath.hh"
 #include "base/loader/object_file.hh"
 #include "base/misc.hh"
 #include "base/trace.hh"
@@ -88,13 +87,11 @@
 #include "cpu/base.hh"
 #include "cpu/thread_context.hh"
 #include "mem/page_table.hh"
-#include "sim/byteswap.hh"
 #include "sim/emul_driver.hh"
 #include "sim/process.hh"
 #include "sim/syscall_debug_macros.hh"
 #include "sim/syscall_emul_buf.hh"
 #include "sim/syscall_return.hh"
-#include "sim/system.hh"
 
 class SyscallDesc;
 
@@ -156,7 +153,7 @@ SyscallReturn lseekFunc(SyscallDesc *desc, int num,
 
 /// Target _llseek() handler.
 SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
-                        LiveProcess *p, ThreadContext *tc);
+                          LiveProcess *p, ThreadContext *tc);
 
 /// Target munmap() handler.
 SyscallReturn munmapFunc(SyscallDesc *desc, int num,
@@ -236,39 +233,39 @@ SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
 
 /// Target fcntl64() handler.
 SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
-                        LiveProcess *process, ThreadContext *tc);
+                          LiveProcess *process, ThreadContext *tc);
 
 /// Target setuid() handler.
 SyscallReturn setuidFunc(SyscallDesc *desc, int num,
-                               LiveProcess *p, ThreadContext *tc);
+                         LiveProcess *p, ThreadContext *tc);
 
 /// Target getpid() handler.
 SyscallReturn getpidFunc(SyscallDesc *desc, int num,
-                               LiveProcess *p, ThreadContext *tc);
+                         LiveProcess *p, ThreadContext *tc);
 
 /// Target getuid() handler.
 SyscallReturn getuidFunc(SyscallDesc *desc, int num,
-                               LiveProcess *p, ThreadContext *tc);
+                         LiveProcess *p, ThreadContext *tc);
 
 /// Target getgid() handler.
 SyscallReturn getgidFunc(SyscallDesc *desc, int num,
-                               LiveProcess *p, ThreadContext *tc);
+                         LiveProcess *p, ThreadContext *tc);
 
 /// Target getppid() handler.
 SyscallReturn getppidFunc(SyscallDesc *desc, int num,
-                               LiveProcess *p, ThreadContext *tc);
+                          LiveProcess *p, ThreadContext *tc);
 
 /// Target geteuid() handler.
 SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
-                               LiveProcess *p, ThreadContext *tc);
+                          LiveProcess *p, ThreadContext *tc);
 
 /// Target getegid() handler.
 SyscallReturn getegidFunc(SyscallDesc *desc, int num,
-                               LiveProcess *p, ThreadContext *tc);
+                          LiveProcess *p, ThreadContext *tc);
 
 /// Target clone() handler.
 SyscallReturn cloneFunc(SyscallDesc *desc, int num,
-                               LiveProcess *p, ThreadContext *tc);
+                        LiveProcess *p, ThreadContext *tc);
 
 /// Target access() handler
 SyscallReturn accessFunc(SyscallDesc *desc, int num,
diff --git a/src/sim/syscall_return.hh b/src/sim/syscall_return.hh
index fdd740775..1d531daac 100644
--- a/src/sim/syscall_return.hh
+++ b/src/sim/syscall_return.hh
@@ -31,7 +31,7 @@
 #ifndef __SIM_SYSCALLRETURN_HH__
 #define __SIM_SYSCALLRETURN_HH__
 
-#include "base/types.hh"
+#include <inttypes.h>
 
 /**
  * This class represents the return value from an emulated system call,
diff --git a/src/sim/system.hh b/src/sim/system.hh
index 7e167c75f..2d491e8c3 100644
--- a/src/sim/system.hh
+++ b/src/sim/system.hh
@@ -53,7 +53,6 @@
 
 #include "arch/isa_traits.hh"
 #include "base/loader/symtab.hh"
-#include "base/misc.hh"
 #include "base/statistics.hh"
 #include "config/the_isa.hh"
 #include "enums/MemoryMode.hh"
@@ -71,11 +70,9 @@
 #include "cpu/pc_event.hh"
 #endif
 
-class BaseCPU;
 class BaseRemoteGDB;
 class GDBListener;
 class ObjectFile;
-class Platform;
 class ThreadContext;
 
 class System : public MemObject
diff --git a/src/sim/ticked_object.cc b/src/sim/ticked_object.cc
index ecdb87827..4cd0dc171 100644
--- a/src/sim/ticked_object.cc
+++ b/src/sim/ticked_object.cc
@@ -39,6 +39,9 @@
 
 #include "sim/ticked_object.hh"
 
+#include "params/TickedObject.hh"
+#include "sim/clocked_object.hh"
+
 Ticked::Ticked(ClockedObject &object_,
     Stats::Scalar *imported_num_cycles,
     Event::Priority priority) :
diff --git a/src/sim/ticked_object.hh b/src/sim/ticked_object.hh
index b21322670..d8b69a320 100644
--- a/src/sim/ticked_object.hh
+++ b/src/sim/ticked_object.hh
@@ -48,9 +48,10 @@
 #ifndef __SIM_TICKED_OBJECT_HH__
 #define __SIM_TICKED_OBJECT_HH__
 
-#include "params/TickedObject.hh"
 #include "sim/clocked_object.hh"
 
+class TickedObjectParams;
+
 /** Ticked attaches gem5's event queue/scheduler to evaluate
  *  calls and provides a start/stop interface to ticking.
  *
diff --git a/src/sim/voltage_domain.cc b/src/sim/voltage_domain.cc
index 0c5b65d6a..6f32dc7c0 100644
--- a/src/sim/voltage_domain.cc
+++ b/src/sim/voltage_domain.cc
@@ -43,6 +43,7 @@
 #include <algorithm>
 
 #include "base/statistics.hh"
+#include "base/trace.hh"
 #include "debug/VoltageDomain.hh"
 #include "params/VoltageDomain.hh"
 #include "sim/sim_object.hh"
diff --git a/src/sim/vptr.hh b/src/sim/vptr.hh
index 658959a90..6eefd5937 100644
--- a/src/sim/vptr.hh
+++ b/src/sim/vptr.hh
@@ -31,8 +31,6 @@
 #ifndef __ARCH_ALPHA_VPTR_HH__
 #define __ARCH_ALPHA_VPTR_HH__
 
-#include "arch/isa_traits.hh"
-#include "arch/vtophys.hh"
 #include "mem/fs_translating_port_proxy.hh"
 
 class ThreadContext;