add FRED feature bit and CPUID reporting

add fred.cc dummy file
add FRED MSR enums to msr.h

shape of ERETS

add FRED MSR MSRs to msr.cc

FRED Event Delivery initial code

64-bit CR4 support

fred ISA decoding and other random stuff

FRED modifies behavior of existing instructions

added LKGS emulation

continue implementation, mainly VMX support self

use CR4 class in VMX host and guest state structures

CSL is MSR_IA32_FRED_CONFIG[1:0], not extra state

fixed non-printable character in comment, continue implementation

support also CR4_HI print in debug dump

implement loading of CS and SS in ERETU

started VMX support for FRED

other way of handling FredEventDelivery

add (c)

continue implementation

mention FRED in CHANGES

proper way to load CS and SS in ERETU

Author: Stanislav Shwartsman

bochs/CHANGES

@@ -11,6 +11,7 @@ Detailed change log :
 - CPU emulation and instrumentation
   - CPU: Implemented MOVRS ISA support: MOVRS, AVX10.2 MOVRS, AMX MOVRS
   - CPU: implemented IA32_APERF (0xe7) and IA32_MPERF (0xe8) MSRs
+  - CPU: implemented Flexible Return and Delivery (FRED) architecture emulation
   - Added new BX_INSTR_CPUID instrumentation callback, see instrumentation.txt doc for description
   - Bugfixes for CPU emulation correctness
 

bochs/build/win32/vs2019-workspace/vs2019-plugins/cpu.vcxproj

@@ -263,6 +263,7 @@
     <ClCompile Include="..\cpu\flag_ctrl.cc" />
     <ClCompile Include="..\cpu\flag_ctrl_pro.cc" />
     <ClCompile Include="..\cpu\fpu_emu.cc" />
+    <ClCompile Include="..\cpu\fred.cc" />
     <ClCompile Include="..\cpu\gf2.cc" />
     <ClCompile Include="..\cpu\icache.cc" />
     <ClCompile Include="..\cpu\init.cc" />

bochs/build/win32/vs2019-workspace/vs2019/cpu.vcxproj

@@ -263,6 +263,7 @@
     <ClCompile Include="..\cpu\flag_ctrl.cc" />
     <ClCompile Include="..\cpu\flag_ctrl_pro.cc" />
     <ClCompile Include="..\cpu\fpu_emu.cc" />
+    <ClCompile Include="..\cpu\fred.cc" />
     <ClCompile Include="..\cpu\gf2.cc" />
     <ClCompile Include="..\cpu\icache.cc" />
     <ClCompile Include="..\cpu\init.cc" />

bochs/config.h.in

@@ -625,6 +625,7 @@ typedef Bit32u bx_phy_address;
 #define BX_SUPPORT_PKEYS 0
 #define BX_SUPPORT_CET 0
 #define BX_SUPPORT_UINTR 0
+#define BX_SUPPORT_FRED 0
 #define BX_SUPPORT_MONITOR_MWAIT 0
 #define BX_SUPPORT_PERFMON 0
 #define BX_SUPPORT_MEMTYPE 0
@@ -638,6 +639,10 @@ typedef Bit32u bx_phy_address;
   #error "UINTR require x86-64 support"
 #endif
 
+#if BX_SUPPORT_FRED && BX_SUPPORT_X86_64 == 0
+  #error "FRED require x86-64 support"
+#endif
+
 #if BX_SUPPORT_SVM && BX_SUPPORT_X86_64 == 0
   #error "SVM require x86-64 support"
 #endif

bochs/configure

@@ -1070,6 +1070,7 @@ enable_svm
 enable_protection_keys
 enable_cet
 enable_uintr
+enable_fred
 enable_3dnow
 enable_alignment_check
 enable_monitor_mwait
@@ -1811,6 +1812,7 @@ Optional Features:
                           User-Mode Protection Keys support (no)
   --enable-cet            Control Flow Enforcement Technology support (no)
   --enable-uintr          for User Level Interrupt support (no)
+  --enable-fred           for Flexible Interrupt Delivery FRED support (no)
   --enable-3dnow          3DNow! support (no - incomplete)
   --enable-alignment-check
                           alignment check (#AC) support (yes, if cpu level >
@@ -6281,7 +6283,7 @@ ia64-*-hpux*)
   ;;
 *-*-irix6*)
   # Find out which ABI we are using.
-  echo '#line 6284 "configure"' > conftest.$ac_ext
+  echo '#line 6286 "configure"' > conftest.$ac_ext
   if { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_compile\""; } >&5
   (eval $ac_compile) 2>&5
   ac_status=$?
@@ -7794,11 +7796,11 @@ else case e in #(
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:7797: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:7799: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:7801: \$? = $ac_status" >&5
+   echo "$as_me:7803: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -8029,11 +8031,11 @@ else case e in #(
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:8032: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:8034: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:8036: \$? = $ac_status" >&5
+   echo "$as_me:8038: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -8098,11 +8100,11 @@ else case e in #(
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:8101: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:8103: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:8105: \$? = $ac_status" >&5
+   echo "$as_me:8107: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -9940,7 +9942,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 9943 "configure"
+#line 9945 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10036,7 +10038,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 10039 "configure"
+#line 10041 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -12158,11 +12160,11 @@ else case e in #(
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:12161: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:12163: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:12165: \$? = $ac_status" >&5
+   echo "$as_me:12167: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -12227,11 +12229,11 @@ else case e in #(
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:12230: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:12232: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:12234: \$? = $ac_status" >&5
+   echo "$as_me:12236: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -13267,7 +13269,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 13270 "configure"
+#line 13272 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -13363,7 +13365,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 13366 "configure"
+#line 13368 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -14184,11 +14186,11 @@ else case e in #(
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:14187: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:14189: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:14191: \$? = $ac_status" >&5
+   echo "$as_me:14193: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -14253,11 +14255,11 @@ else case e in #(
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:14256: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:14258: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:14260: \$? = $ac_status" >&5
+   echo "$as_me:14262: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -16222,11 +16224,11 @@ else case e in #(
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:16225: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:16227: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:16229: \$? = $ac_status" >&5
+   echo "$as_me:16231: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -16457,11 +16459,11 @@ else case e in #(
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:16460: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:16462: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:16464: \$? = $ac_status" >&5
+   echo "$as_me:16466: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -16526,11 +16528,11 @@ else case e in #(
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:16529: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:16531: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:16533: \$? = $ac_status" >&5
+   echo "$as_me:16535: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -18368,7 +18370,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 18371 "configure"
+#line 18373 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -18464,7 +18466,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 18467 "configure"
+#line 18469 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -20222,7 +20224,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 20225 "configure"
+#line 20227 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -24689,6 +24691,41 @@ if test "$support_uintr" -gt 0 -a "$use_x86_64" = 0; then
   as_fn_error $? "User Level Interrupt feature emulation require x86-64 enabled" "$LINENO" 5
 fi
 
+support_fred=0
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Flexible Interrupt Delivery FRED support (experimental)" >&5
+printf %s "checking for Flexible Interrupt Delivery FRED support (experimental)... " >&6; }
+# Check whether --enable-fred was given.
+if test ${enable_fred+y}
+then :
+  enableval=$enable_fred; if test "$enableval" = yes; then
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+printf "%s\n" "yes" >&6; }
+    printf "%s\n" "#define BX_SUPPORT_FRED 1" >>confdefs.h
+
+    support_fred=1
+   elif test "$enableval" = no; then
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+    printf "%s\n" "#define BX_SUPPORT_FRED 0" >>confdefs.h
+
+   fi
+
+else case e in #(
+  e)
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+    printf "%s\n" "#define BX_SUPPORT_FRED 0" >>confdefs.h
+
+
+   ;;
+esac
+fi
+
+
+if test "$support_fred" -gt 0 -a "$use_x86_64" = 0; then
+  as_fn_error $? "Flexible Interrupt Delivery (FRED) emulation require x86-64 enabled" "$LINENO" 5
+fi
+
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for 3DNow! support" >&5
 printf %s "checking for 3DNow! support... " >&6; }
 # Check whether --enable-3dnow was given.
@@ -24797,8 +24834,8 @@ esac
 fi
 
 
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for limited hardware performance monitoring emulation support (experimental)" >&5
-printf %s "checking for limited hardware performance monitoring emulation support (experimental)... " >&6; }
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for limited hardware performance monitoring emulation support" >&5
+printf %s "checking for limited hardware performance monitoring emulation support... " >&6; }
 # Check whether --enable-perfmon was given.
 if test ${enable_perfmon+y}
 then :

bochs/configure.ac

@@ -1285,6 +1285,29 @@ if test "$support_uintr" -gt 0 -a "$use_x86_64" = 0; then
   AC_MSG_ERROR([User Level Interrupt feature emulation require x86-64 enabled])
 fi
 
+support_fred=0
+AC_MSG_CHECKING(for Flexible Interrupt Delivery FRED support (experimental))
+AC_ARG_ENABLE(fred,
+  AS_HELP_STRING([--enable-fred], [for Flexible Interrupt Delivery FRED support (no)]),
+  [if test "$enableval" = yes; then
+    AC_MSG_RESULT(yes)
+    AC_DEFINE(BX_SUPPORT_FRED, 1)
+    support_fred=1
+   elif test "$enableval" = no; then
+    AC_MSG_RESULT(no)
+    AC_DEFINE(BX_SUPPORT_FRED, 0)
+   fi
+   ],
+  [
+    AC_MSG_RESULT(no)
+    AC_DEFINE(BX_SUPPORT_FRED, 0)
+  ]
+  )
+
+if test "$support_fred" -gt 0 -a "$use_x86_64" = 0; then
+  AC_MSG_ERROR([Flexible Interrupt Delivery (FRED) emulation require x86-64 enabled])
+fi
+
 AC_MSG_CHECKING(for 3DNow! support)
 AC_ARG_ENABLE(3dnow,
   AS_HELP_STRING([--enable-3dnow], [3DNow! support (no - incomplete)]),
@@ -1351,7 +1374,7 @@ AC_ARG_ENABLE(monitor_mwait,
   ]
   )
 
-AC_MSG_CHECKING(for limited hardware performance monitoring emulation support (experimental))
+AC_MSG_CHECKING(for limited hardware performance monitoring emulation support)
 AC_ARG_ENABLE(perfmon,
   AS_HELP_STRING([--enable-perfmon], [support for limited hardware performance monitoring emulation (yes, if cpu level > 5 - experimental)]),
   [if test "$enableval" = yes; then

bochs/cpu/Makefile.in

@@ -149,6 +149,7 @@ OBJS64 = \
 	cmpccxadd64.o \
 	vapic.o \
 	uintr.o \
+	fred.o
 
 BX_INCLUDES = ../bochs.h ../config.h
 
@@ -792,6 +793,12 @@ tasking.o: tasking.@CPP_SUFFIX@ ../bochs.h ../config.h ../osdep.h ../logio.h \
  fpu/status_w.h fpu/control_w.h crregs.h descriptor.h decoder/instr.h \
  lazy_flags.h tlb.h icache.h xmm.h vmx.h vmx_ctrls.h stack.h access.h \
  svm.h
+fred.o: fred.@CPP_SUFFIX@ ../bochs.h ../config.h ../osdep.h ../logio.h \
+ ../misc/bswap.h cpu.h decoder/decoder.h decoder/features.h \
+ ../instrument/stubs/instrument.h i387.h \
+ softfloat3e/include/softfloat_types.h ../config.h fpu/tag_w.h \
+ fpu/status_w.h fpu/control_w.h crregs.h descriptor.h decoder/instr.h \
+ lazy_flags.h tlb.h icache.h xmm.h vmx.h vmx_ctrls.h stack.h access.h
 uintr.o: uintr.@CPP_SUFFIX@ ../bochs.h ../config.h ../osdep.h ../logio.h \
  ../misc/bswap.h cpu.h decoder/decoder.h decoder/features.h \
  ../instrument/stubs/instrument.h i387.h \

bochs/cpu/call_far.cc

@@ -171,6 +171,12 @@ BX_CPU_C::call_protected(bxInstruction_c *i, Bit16u cs_raw, bx_address disp)
         BX_ERROR(("call_protected: gate type %u unsupported in long mode", (unsigned) gate_descriptor.type));
         exception(BX_GP_EXCEPTION, cs_raw & 0xfffc);
       }
+#if BX_SUPPORT_FRED
+      if (BX_CPU_THIS_PTR cr4.get_FRED()) {
+        BX_ERROR(("call_protected: call gate not allowed when FRED is enabled"));
+        exception(BX_GP_EXCEPTION, cs_raw & 0xfffc);
+      }
+#endif
       // gate descriptor must be present else #NP(gate selector)
       if (! IS_PRESENT(gate_descriptor)) {
         BX_ERROR(("call_protected: call gate not present"));