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hw/misc: Add npcm7xx random number generator

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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>
This commit is contained in:
Havard Skinnemoen 2020-10-23 14:06:35 -07:00 • committed by Peter Maydell
parent 7d378ed6e3
commit 326ccfe240
9 changed files with 510 additions and 3 deletions
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34
include/hw/misc/npcm7xx_rng.h Normal file
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/*
* Nuvoton NPCM7xx Random Number Generator.
*
* Copyright 2020 Google LLC
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#ifndef NPCM7XX_RNG_H
#define NPCM7XX_RNG_H
#include "hw/sysbus.h"
typedef struct NPCM7xxRNGState {
SysBusDevice parent;
MemoryRegion iomem;
uint8_t rngcs;
uint8_t rngd;
uint8_t rngmode;
} NPCM7xxRNGState;
#define TYPE_NPCM7XX_RNG "npcm7xx-rng"
#define NPCM7XX_RNG(obj) OBJECT_CHECK(NPCM7xxRNGState, (obj), TYPE_NPCM7XX_RNG)
#endif /* NPCM7XX_RNG_H */