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/* Copyright (c) 2023, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include "internal.h"
// While Arm system registers are normally not available to userspace, FreeBSD
// expects userspace to simply read them. It traps the reads and fills in CPU
// capabilities.
#if defined(OPENSSL_AARCH64) && !defined(OPENSSL_STATIC_ARMCAP) && \
(defined(ANDROID_BAREMETAL) || defined(OPENSSL_FREEBSD)) && \
!defined(OPENSSL_NO_ASM)
#include <openssl/arm_arch.h>
#define ID_AA64PFR0_EL1_ADVSIMD 5
#define ID_AA64ISAR0_EL1_AES 1
#define ID_AA64ISAR0_EL1_SHA1 2
#define ID_AA64ISAR0_EL1_SHA2 3
#define NBITS_ID_FIELD 4
#define READ_SYSREG(name) \
({ \
uint64_t _r; \
__asm__("mrs %0, " name : "=r"(_r)); \
_r; \
})
static unsigned get_id_field(uint64_t reg, unsigned field) {
return (reg >> (field * NBITS_ID_FIELD)) & ((1 << NBITS_ID_FIELD) - 1);
}
static int get_signed_id_field(uint64_t reg, unsigned field) {
unsigned value = get_id_field(reg, field);
if (value & (1 << (NBITS_ID_FIELD - 1))) {
return (int)(value | (UINT64_MAX << NBITS_ID_FIELD));
} else {
return (int)value;
}
}
static uint32_t read_armcap(void) {
uint32_t armcap = ARMV7_NEON;
uint64_t id_aa64pfr0_el1 = READ_SYSREG("id_aa64pfr0_el1");
if (get_signed_id_field(id_aa64pfr0_el1, ID_AA64PFR0_EL1_ADVSIMD) < 0) {
// If AdvSIMD ("NEON") is missing, don't report other features either.
// This matches OpenSSL.
return 0;
}
uint64_t id_aa64isar0_el1 = READ_SYSREG("id_aa64isar0_el1");
unsigned aes = get_id_field(id_aa64isar0_el1, ID_AA64ISAR0_EL1_AES);
if (aes > 0) {
armcap |= ARMV8_AES;
}
if (aes > 1) {
armcap |= ARMV8_PMULL;
}
unsigned sha1 = get_id_field(id_aa64isar0_el1, ID_AA64ISAR0_EL1_SHA1);
if (sha1 > 0) {
armcap |= ARMV8_SHA1;
}
unsigned sha2 = get_id_field(id_aa64isar0_el1, ID_AA64ISAR0_EL1_SHA2);
if (sha2 > 0) {
armcap |= ARMV8_SHA256;
}
if (sha2 > 1) {
armcap |= ARMV8_SHA512;
}
return armcap;
}
void OPENSSL_cpuid_setup(void) { OPENSSL_armcap_P |= read_armcap(); }
#endif // OPENSSL_AARCH64 && !OPENSSL_STATIC_ARMCAP &&
// (ANDROID_BAREMETAL || OPENSSL_FREEBSD)