The RNG module returns a byte of randomness when the Data Valid bit is set. This implementation ignores the prescaler setting, and loads a new value into RNGD every time RNGCS is read while the RNG is enabled and random data is available. A qtest featuring some simple randomness tests is included. Reviewed-by: Tyrone Ting <kfting@nuvoton.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
35 lines
964 B
C
35 lines
964 B
C
/*
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* Nuvoton NPCM7xx Random Number Generator.
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*
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* Copyright 2020 Google LLC
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#ifndef NPCM7XX_RNG_H
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#define NPCM7XX_RNG_H
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#include "hw/sysbus.h"
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typedef struct NPCM7xxRNGState {
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SysBusDevice parent;
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MemoryRegion iomem;
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uint8_t rngcs;
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uint8_t rngd;
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uint8_t rngmode;
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} NPCM7xxRNGState;
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#define TYPE_NPCM7XX_RNG "npcm7xx-rng"
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#define NPCM7XX_RNG(obj) OBJECT_CHECK(NPCM7xxRNGState, (obj), TYPE_NPCM7XX_RNG)
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#endif /* NPCM7XX_RNG_H */
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