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fw: break out trng and xorwow to rng.[ch]

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Daniel Jobson 2024-09-04 13:43:57 +02:00
parent f1a72191f6
commit 7279526e92
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GPG key ID: 3707A9DBF4BB8F1A
4 changed files with 53 additions and 29 deletions
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29
hw/application_fpga/fw/tk1/rng.c Normal file
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// Copyright (C) 2024 - Tillitis AB
// SPDX-License-Identifier: GPL-2.0-only
#include "rng.h"
#include "../tk1_mem.h"
#include <stdint.h>
// clang-format off
static volatile uint32_t *trng_status = (volatile uint32_t *)TK1_MMIO_TRNG_STATUS;
static volatile uint32_t *trng_entropy = (volatile uint32_t *)TK1_MMIO_TRNG_ENTROPY;
// clang-format on
//
//
uint32_t rng_get_word(void)
{
while ((*trng_status & (1 << TK1_MMIO_TRNG_STATUS_READY_BIT)) == 0) {
}
return *trng_entropy;
}
uint32_t rng_xorwow(uint32_t state, uint32_t acc)
{
state ^= state << 13;
state ^= state >> 17;
state ^= state << 5;
state += acc;
return state;
}