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diff --git a/gdb/arch/x86-linux-tdesc-features.h b/gdb/arch/x86-linux-tdesc-features.h
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+++ b/gdb/arch/x86-linux-tdesc-features.h
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+/* Target description related code for GNU/Linux x86 (i386 and x86-64).
+
+   Copyright (C) 2024 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef ARCH_X86_LINUX_TDESC_FEATURES_H
+#define ARCH_X86_LINUX_TDESC_FEATURES_H
+
+#include "gdbsupport/x86-xstate.h"
+#include "gdbsupport/gdb_assert.h"
+
+/* Return a mask of X86_STATE_* feature flags.  The returned mask indicates
+   the set of features which are checked for when creating the target
+   description for each of amd64, x32, and i386.  */
+
+extern uint64_t x86_linux_amd64_xcr0_feature_mask ();
+extern uint64_t x86_linux_x32_xcr0_feature_mask ();
+extern uint64_t x86_linux_i386_xcr0_feature_mask ();
+
+#ifdef GDBSERVER
+
+/* Convert an xcr0 value into an integer.  The integer will be passed from
+   gdbserver to the in-process-agent where it will then be passed through
+   x86_linux_tdesc_idx_to_xcr0 to get back the original xcr0 value.  */
+
+extern int x86_linux_xcr0_to_tdesc_idx (uint64_t xcr0);
+
+#endif /* GDBSERVER */
+
+#ifdef IN_PROCESS_AGENT
+
+/* Return the maximum possible number of target descriptions for each of
+   amd64, x32, and i386.  These are used by the in-process-agent to
+   generate every possible target description.  */
+
+extern int x86_linux_amd64_tdesc_count ();
+extern int x86_linux_x32_tdesc_count ();
+extern int x86_linux_i386_tdesc_count ();
+
+/* Convert an index number (as returned from x86_linux_xcr0_to_tdesc_idx)
+   into an xcr0 value which can then be used to create a target
+   description.  */
+
+extern uint64_t x86_linux_tdesc_idx_to_xcr0 (int idx);
+
+#endif /* IN_PROCESS_AGENT */
+
+#endif /* ARCH_X86_LINUX_TDESC_FEATURES_H */