1/* Handle AT_HWCAP2. Linux/x86 version.
2 Copyright (C) 2023 Free Software Foundation, Inc.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18/* The following must match the kernel's <asm/hwcap2.h>. */
19#define HWCAP2_RING3MWAIT (1 << 0)
20#define HWCAP2_FSGSBASE (1 << 1)
21
22static inline void
23dl_check_hwcap2 (struct cpu_features *cpu_features)
24{
25 if ((GLRO(dl_hwcap2) & HWCAP2_FSGSBASE) != 0)
26 CPU_FEATURE_SET_ACTIVE (cpu_features, FSGSBASE);
27}
28