libz-sys 1.1.28

Low-level bindings to the system libz library (also known as zlib).
Documentation 
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/* power_features.c - POWER feature check
 * Copyright (C) 2020 Matheus Castanho <msc@linux.ibm.com>, IBM
 * Copyright (C) 2021-2024 Mika T. Lindqvist <postmaster@raasu.org>
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#ifdef HAVE_SYS_AUXV_H
#  include <sys/auxv.h>
#endif
#ifdef POWER_NEED_AUXVEC_H
#  include <linux/auxvec.h>
#endif
#ifdef __FreeBSD__
#  include <machine/cpu.h>
#endif
#include "zbuild.h"
#include "power_features.h"

void Z_INTERNAL power_check_features(struct power_cpu_features *features) {
#ifdef PPC_FEATURES
    unsigned long hwcap;
#if defined(__FreeBSD__) || defined(__OpenBSD__)
    elf_aux_info(AT_HWCAP, &hwcap, sizeof(hwcap));
#else
    hwcap = getauxval(AT_HWCAP);
#endif

    if (hwcap & PPC_FEATURE_HAS_ALTIVEC)
        features->has_altivec = 1;
#endif

#ifdef POWER_FEATURES
    unsigned long hwcap2;
#if defined(__FreeBSD__) || defined(__OpenBSD__)
    elf_aux_info(AT_HWCAP2, &hwcap2, sizeof(hwcap2));
#else
    hwcap2 = getauxval(AT_HWCAP2);
#endif

#ifdef POWER8_VSX
    if (hwcap2 & PPC_FEATURE2_ARCH_2_07)
        features->has_arch_2_07 = 1;
#endif
#ifdef POWER9
    if (hwcap2 & PPC_FEATURE2_ARCH_3_00)
        features->has_arch_3_00 = 1;
#endif
#endif
}