From 326ccfe240ca9ef4f659a241b39390fa956e999b Mon Sep 17 00:00:00 2001 From: Havard Skinnemoen Date: Fri, 23 Oct 2020 14:06:35 -0700 Subject: hw/misc: Add npcm7xx random number generator 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 Reviewed-by: Peter Maydell Signed-off-by: Havard Skinnemoen Signed-off-by: Peter Maydell --- include/hw/misc/npcm7xx_rng.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 include/hw/misc/npcm7xx_rng.h (limited to 'include/hw/misc') diff --git a/include/hw/misc/npcm7xx_rng.h b/include/hw/misc/npcm7xx_rng.h new file mode 100644 index 0000000000..5e85fd439d --- /dev/null +++ b/include/hw/misc/npcm7xx_rng.h @@ -0,0 +1,34 @@ +/* + * 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 */ -- cgit v1.2.3-55-g7522