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