diff --git a/clang/include/clang/Basic/LangOptions.def b/clang/include/clang/Basic/LangOptions.def
--- a/clang/include/clang/Basic/LangOptions.def
+++ b/clang/include/clang/Basic/LangOptions.def
@@ -88,6 +88,7 @@
 LANGOPT(C17               , 1, 0, "C17")
 LANGOPT(C2x               , 1, 0, "C2x")
 LANGOPT(MSVCCompat        , 1, 0, "Microsoft Visual C++ full compatibility mode")
+LANGOPT(Kernel            , 1, 0, "Kernel mode")
 LANGOPT(MicrosoftExt      , 1, 0, "Microsoft C++ extensions")
 LANGOPT(AsmBlocks         , 1, 0, "Microsoft inline asm blocks")
 LANGOPT(Borland           , 1, 0, "Borland extensions")
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -2178,6 +2178,8 @@
   NormalizedValues<["PPTMK_FullGeneralitySingleInheritance", "PPTMK_FullGeneralityMultipleInheritance",
                     "PPTMK_FullGeneralityVirtualInheritance"]>,
   MarshallingInfoEnum<LangOpts<"MSPointerToMemberRepresentationMethod">, "PPTMK_BestCase">;
+def fms_kernel : Flag<["-"], "fms-kernel">, Group<f_Group>, Flags<[CC1Option, NoDriverOption]>,
+  MarshallingInfoFlag<LangOpts<"Kernel">>;
 // __declspec is enabled by default for the PS4 by the driver, and also
 // enabled for Microsoft Extensions or Borland Extensions, here.
 //
diff --git a/clang/lib/Basic/Targets/OSTargets.cpp b/clang/lib/Basic/Targets/OSTargets.cpp
--- a/clang/lib/Basic/Targets/OSTargets.cpp
+++ b/clang/lib/Basic/Targets/OSTargets.cpp
@@ -215,6 +215,9 @@
     }
   }
 
+  if (Opts.Kernel)
+    Builder.defineMacro("_KERNEL_MODE");
+
   Builder.defineMacro("_INTEGRAL_MAX_BITS", "64");
   Builder.defineMacro("__STDC_NO_THREADS__");
 
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -38,6 +38,7 @@
 #include "clang/Driver/SanitizerArgs.h"
 #include "clang/Driver/Types.h"
 #include "clang/Driver/XRayArgs.h"
+#include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Config/llvm-config.h"
 #include "llvm/Option/ArgList.h"
@@ -7458,6 +7459,12 @@
     EH.NoUnwindC = true;
   }
 
+  if (Args.hasArg(options::OPT__SLASH_kernel)) {
+    EH.Synch = false;
+    EH.NoUnwindC = false;
+    EH.Asynch = false;
+  }
+
   return EH;
 }
 
@@ -7602,6 +7609,26 @@
    CmdArgs.push_back("-fno-wchar");
  }
 
+ if (Args.hasArg(options::OPT__SLASH_kernel)) {
+   llvm::Triple::ArchType Arch = getToolChain().getArch();
+   std::vector<std::string> Values =
+       Args.getAllArgValues(options::OPT__SLASH_arch);
+   if (!Values.empty()) {
+     llvm::SmallSet<std::string, 4> SupportedArches;
+     if (Arch == llvm::Triple::x86) {
+       std::vector<std::string> Arches = {"IA32"};
+       SupportedArches.insert(Arches.begin(), Arches.end());
+     }
+
+     for (auto &V : Values)
+       if (!SupportedArches.contains(V))
+         D.Diag(diag::err_drv_argument_not_allowed_with)
+             << std::string("/arch:").append(V) << "/kernel";
+   }
+
+   CmdArgs.push_back("-fno-rtti");
+ }
+
   Arg *MostGeneralArg = Args.getLastArg(options::OPT__SLASH_vmg);
   Arg *BestCaseArg = Args.getLastArg(options::OPT__SLASH_vmb);
   if (MostGeneralArg && BestCaseArg)
@@ -7671,6 +7698,9 @@
     CmdArgs.push_back("msvc");
   }
 
+  if (Args.hasArg(options::OPT__SLASH_kernel))
+    CmdArgs.push_back("-fms-kernel");
+
   if (Arg *A = Args.getLastArg(options::OPT__SLASH_guard)) {
     StringRef GuardArgs = A->getValue();
     // The only valid options are "cf", "cf,nochecks", "cf-", "ehcont" and
diff --git a/clang/test/Driver/cl-zc.cpp b/clang/test/Driver/cl-zc.cpp
--- a/clang/test/Driver/cl-zc.cpp
+++ b/clang/test/Driver/cl-zc.cpp
@@ -24,6 +24,28 @@
 // RUN: %clang_cl /c /std:c++17 -### /Zc:alignedNew- -- %s 2>&1 | FileCheck -check-prefix=ALIGNED-NEW-OFF %s
 // ALIGNED-NEW-OFF-NOT: "-faligned-allocation"
 
+// RUN: %clang_cl /c -### /kernel -- %s 2>&1 | FileCheck -check-prefixes=KERNEL-NO-RTTI,KERNEL-NO-EXCEPTIONS %s
+// KERNEL-NO-RTTI: "-fno-rtti"
+// KERNEL-NO-EXCEPTIONS-NOT: "-fcxx-exceptions" "-fexceptions"
+
+// RUN: %clang_cl /c -### --target=i686-pc-windows-msvc /kernel /arch:SSE -- %s 2>&1 | FileCheck -check-prefixes=KERNEL-SSE %s
+// RUN: %clang_cl /c -### --target=i686-pc-windows-msvc /kernel /arch:SSE2 -- %s 2>&1 | FileCheck -check-prefixes=KERNEL-SSE2 %s
+// RUN: %clang_cl /c -### --target=i686-pc-windows-msvc /kernel /arch:AVX -- %s 2>&1 | FileCheck -check-prefixes=KERNEL-AVX %s
+// RUN: %clang_cl /c -### --target=i686-pc-windows-msvc /kernel /arch:AVX2 -- %s 2>&1 | FileCheck -check-prefixes=KERNEL-AVX2 %s
+// RUN: %clang_cl /c -### --target=i686-pc-windows-msvc /kernel /arch:AVX512 -- %s 2>&1 | FileCheck -check-prefixes=KERNEL-AVX512 %s
+// KERNEL-SSE: error: invalid argument '/arch:SSE' not allowed with '/kernel'
+// KERNEL-SSE2: error: invalid argument '/arch:SSE2' not allowed with '/kernel'
+// KERNEL-AVX: error: invalid argument '/arch:AVX' not allowed with '/kernel'
+// KERNEL-AVX2: error: invalid argument '/arch:AVX2' not allowed with '/kernel'
+// KERNEL-AVX512: error: invalid argument '/arch:AVX512' not allowed with '/kernel'
+
+// RUN: %clang_cl /c -### --target=x86_64-pc-windows-msvc /kernel /arch:AVX -- %s 2>&1 | FileCheck -check-prefixes=KERNEL-X64-AVX %s
+// RUN: %clang_cl /c -### --target=x86_64-pc-windows-msvc /kernel /arch:AVX2 -- %s 2>&1 | FileCheck -check-prefixes=KERNEL-X64-AVX2 %s
+// RUN: %clang_cl /c -### --target=x86_64-pc-windows-msvc /kernel /arch:AVX512 -- %s 2>&1 | FileCheck -check-prefixes=KERNEL-X64-AVX512 %s
+// KERNEL-X64-AVX: error: invalid argument '/arch:AVX' not allowed with '/kernel'
+// KERNEL-X64-AVX2: error: invalid argument '/arch:AVX2' not allowed with '/kernel'
+// KERNEL-X64-AVX512: error: invalid argument '/arch:AVX512' not allowed with '/kernel'
+
 // RUN: %clang_cl /c -### -- %s 2>&1 | FileCheck -check-prefix=STRICTSTRINGS-DEFAULT %s
 // STRICTSTRINGS-DEFAULT-NOT: -Werror=c++11-compat-deprecated-writable-strings
 // RUN: %clang_cl /c -### /Zc:strictStrings -- %s 2>&1 | FileCheck -check-prefix=STRICTSTRINGS-ON %s