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/*
* Helper for pauth test case
*
* Copyright (c) 2023 Linaro Ltd
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <assert.h>
#include <sys/auxv.h>
static int get_pac_feature(void)
{
unsigned long isar1, isar2;
assert(getauxval(AT_HWCAP) & HWCAP_CPUID);
asm("mrs %0, id_aa64isar1_el1" : "=r"(isar1));
asm("mrs %0, S3_0_C0_C6_2" : "=r"(isar2)); /* id_aa64isar2_el1 */
return ((isar1 >> 4) & 0xf) /* APA */
| ((isar1 >> 8) & 0xf) /* API */
| ((isar2 >> 12) & 0xf); /* APA3 */
}
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