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/* Copyright (c) 2021, ARM Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef ODP_AARCH64_RANDOM_H_
#define ODP_AARCH64_RANDOM_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <odp/api/spec/random.h>
#include <odp/autoheader_internal.h>
#include <stdint.h>
odp_random_kind_t _odp_random_max_kind_generic(void);
int32_t _odp_random_true_data_generic(uint8_t *buf, uint32_t len);
int32_t _odp_random_crypto_data_generic(uint8_t *buf, uint32_t len);
#ifdef __ARM_FEATURE_RNG
#if __ARM_FEATURE_UNALIGNED != 1
#error This implementation requires unaligned access
#endif
static inline int _odp_random_max_kind(void)
{
return ODP_RANDOM_TRUE;
}
static inline int _odp_rndr(uint64_t *v)
{
int pass;
/* Return a 64-bit random number which is reseeded from the True Random
* Number source. If the hardware returns a genuine random number,
* PSTATE.NZCV is set to 0b0000. The NZCV condition flag is checked via
* the CSET instruction. If the hardware cannot return a genuine random
* number in a reasonable period of time, PSTATE.NZCV is set to 0b0100
* and the data value returned is 0. */
__asm__ volatile("mrs %0, s3_3_c2_c4_0\n\t"
"cset %w[pass], ne"
: "=r" (*v), [pass] "=r" (pass)
:
: "cc");
return pass;
}
static inline int _odp_rndrrs(uint64_t *v)
{
int pass;
/* Return a 64-bit random number which is reseeded from the True Random
* Number source immediately before the read of the random number.
* If the hardware returns a genuine random number, PSTATE.NZCV is
* set to 0b0000. The NZCV condition flag is checked via the CSET
* instruction. If the hardware cannot return a genuine random number
* in a reasonable period of time, PSTATE.NZCV is set to 0b0100 and the
* data value returned is 0. */
__asm__ volatile("mrs %0, s3_3_c2_c4_1\n\t"
"cset %w[pass], ne"
: "=r" (*v), [pass] "=r" (pass)
:
: "cc");
return pass;
}
static inline int32_t _odp_random_crypto_data(uint8_t *buf, uint32_t len)
{
uint64_t temp;
for (uint32_t i = 0; i < len / 8; i++) {
while (!_odp_rndr(&temp))
;
*(uint64_t *)(uintptr_t)buf = temp;
buf += 8;
}
if (len & 7) {
while (!_odp_rndr(&temp))
;
if (len & 4) {
*(uint32_t *)(uintptr_t)buf = temp & 0xffffffff;
temp >>= 32;
buf += 4;
}
if (len & 2) {
*(uint16_t *)(uintptr_t)buf = temp & 0xffff;
temp >>= 16;
buf += 2;
}
if (len & 1)
*buf = temp & 0xff;
}
return len;
}
static inline int32_t _odp_random_true_data(uint8_t *buf, uint32_t len)
{
uint64_t temp;
for (uint32_t i = 0; i < len / 8; i++) {
while (!_odp_rndrrs(&temp))
;
*(uint64_t *)(uintptr_t)buf = temp;
buf += 8;
}
if (len & 7) {
while (!_odp_rndrrs(&temp))
;
if (len & 4) {
*(uint32_t *)(uintptr_t)buf = temp & 0xffffffff;
temp >>= 32;
buf += 4;
}
if (len & 2) {
*(uint16_t *)(uintptr_t)buf = temp & 0xffff;
temp >>= 16;
buf += 2;
}
if (len & 1)
*buf = temp & 0xff;
}
return len;
}
#else
static inline int _odp_random_max_kind(void)
{
return _odp_random_max_kind_generic();
}
static inline int32_t _odp_random_crypto_data(uint8_t *buf, uint32_t len)
{
return _odp_random_crypto_data_generic(buf, len);
}
static inline int32_t _odp_random_true_data(uint8_t *buf, uint32_t len)
{
return _odp_random_true_data_generic(buf, len);
}
#endif
#ifdef __cplusplus
}
#endif
#endif
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