diff --git a/CMakeLists.txt b/CMakeLists.txt
index 78bbd5e2..60b16699 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -126,7 +126,7 @@ if(PAL_AMD_64BIT_LINUX_IOCTL)
             OUTPUT_DIR ${CMAKE_BINARY_DIR}/c/amd_64bit_linux_ioctl
             LANGUAGE c
             EXECUTION_STATE amd_64bit
-            ACCESS_MECHANISM gnu_inline
+            ACCESS_MECHANISM libpal
         )
     endif()
 
@@ -136,7 +136,7 @@ if(PAL_AMD_64BIT_LINUX_IOCTL)
             OUTPUT_DIR ${CMAKE_BINARY_DIR}/c++11/amd_64bit_linux_ioctl
             LANGUAGE c++11
             EXECUTION_STATE amd_64bit
-            ACCESS_MECHANISM gnu_inline
+            ACCESS_MECHANISM libpal
         )
     endif()
 
diff --git a/pal/writer/access_mechanism/libpal.py b/pal/writer/access_mechanism/libpal.py
index bdafcccb..118e39d8 100644
--- a/pal/writer/access_mechanism/libpal.py
+++ b/pal/writer/access_mechanism/libpal.py
@@ -204,7 +204,12 @@ def __declare_msr_register_dependencies(self, outfile, register,
     def __call_cpuid_access_mechanism(self, outfile, register,
                                       access_mechanism, result):
 
-        cpuid_args = [str(access_mechanism.leaf), '0']
+        if register.arch == "intel":
+            cpuid_args = [str(access_mechanism.leaf), '0']
+        elif register.arch == "amd64":
+            cpuid_args = [str(access_mechanism.function), '0']
+        else:
+            raise PalWriterException("CPUID access mechanism not supported for architecture {arch}".format(arch=register.arch))
 
         if register.is_indexed:
             cpuid_args[1] = 'index'
diff --git a/pal/writer/register/c/register_accessor.py b/pal/writer/register/c/register_accessor.py
index 60fa0219..6b3c087c 100644
--- a/pal/writer/register/c/register_accessor.py
+++ b/pal/writer/register/c/register_accessor.py
@@ -38,6 +38,16 @@ def _declare_register_constants(self, outfile, register):
             addr = register.access_mechanisms["rdmsr"][0].address
             self._declare_preprocessor_constant(outfile, prefix + "address", hex(addr))
 
+        if register.access_mechanisms.get("cpuid"):
+            if register.arch == "intel":
+                addr = register.access_mechanisms["cpuid"][0].leaf
+                self._declare_preprocessor_constant(outfile, prefix + "leaf", hex(addr))
+                self.write_newline(outfile)
+            elif register.arch == "amd64":
+                addr = register.access_mechanisms["cpuid"][0].function
+                self._declare_preprocessor_constant(outfile, prefix + "function", hex(addr))
+                self.write_newline(outfile)
+
         if register.access_mechanisms.get("ldr"):
             offset = register.access_mechanisms["ldr"][0].offset
             self._declare_preprocessor_constant(outfile, prefix + "offset", hex(offset))
diff --git a/pal/writer/register/cxx11/register_accessor.py b/pal/writer/register/cxx11/register_accessor.py
index d8e197ae..f0fd58cf 100644
--- a/pal/writer/register/cxx11/register_accessor.py
+++ b/pal/writer/register/cxx11/register_accessor.py
@@ -39,6 +39,16 @@ def _declare_register_constants(self, outfile, register):
             self._declare_hex_integer_constant(outfile, "address", addr)
             self.write_newline(outfile)
 
+        if register.access_mechanisms.get("cpuid"):
+            if register.arch == "intel":
+                addr = register.access_mechanisms["cpuid"][0].leaf
+                self._declare_hex_integer_constant(outfile, "leaf", addr)
+                self.write_newline(outfile)
+            elif register.arch == "amd64":
+                addr = register.access_mechanisms["cpuid"][0].function
+                self._declare_hex_integer_constant(outfile, "function", addr)
+                self.write_newline(outfile)
+
         if register.access_mechanisms.get("ldr"):
             offset = register.access_mechanisms["ldr"][0].offset
             self._declare_hex_integer_constant(outfile, "offset", offset)
diff --git a/pal/writer/register/rust/register_accessor.py b/pal/writer/register/rust/register_accessor.py
index 41b81f2c..ab57cf99 100644
--- a/pal/writer/register/rust/register_accessor.py
+++ b/pal/writer/register/rust/register_accessor.py
@@ -38,6 +38,16 @@ def _declare_register_constants(self, outfile, register):
             self._declare_hex_integer_constant(outfile, prefix + "address", addr, n_bits=32)
             self.write_newline(outfile)
 
+        if register.access_mechanisms.get("cpuid"):
+            if register.arch == "intel":
+                addr = register.access_mechanisms["cpuid"][0].leaf
+                self._declare_hex_integer_constant(outfile, "leaf", addr)
+                self.write_newline(outfile)
+            elif register.arch == "amd64":
+                addr = register.access_mechanisms["cpuid"][0].function
+                self._declare_hex_integer_constant(outfile, "function", addr)
+                self.write_newline(outfile)
+
         if register.access_mechanisms.get("ldr"):
             offset = register.access_mechanisms["ldr"][0].offset
             self._declare_hex_integer_constant(outfile, prefix + "offset", offset)