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| author | Havard Skinnemoen <hskinnemoen@google.com> | 2020-10-23 14:06:35 -0700 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2020-10-27 11:10:10 +0000 |
| commit | 326ccfe240ca9ef4f659a241b39390fa956e999b (patch) | |
| tree | ae846cdf53e92e1d0d629d1f5a5e7a230effda7b /include | |
| parent | 7d378ed6e3b4a26f4da887fcccc4c6f1db3dcd42 (diff) | |
| download | qemu-326ccfe240ca9ef4f659a241b39390fa956e999b.zip qemu-326ccfe240ca9ef4f659a241b39390fa956e999b.tar.gz qemu-326ccfe240ca9ef4f659a241b39390fa956e999b.tar.bz2 | |
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 <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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/arm/npcm7xx.h | 2 | ||||
| -rw-r--r-- | include/hw/misc/npcm7xx_rng.h | 34 |
2 files changed, 36 insertions, 0 deletions
diff --git a/include/hw/arm/npcm7xx.h b/include/hw/arm/npcm7xx.h index 13106af..761f9b9 100644 --- a/include/hw/arm/npcm7xx.h +++ b/include/hw/arm/npcm7xx.h @@ -21,6 +21,7 @@ #include "hw/mem/npcm7xx_mc.h" #include "hw/misc/npcm7xx_clk.h" #include "hw/misc/npcm7xx_gcr.h" +#include "hw/misc/npcm7xx_rng.h" #include "hw/nvram/npcm7xx_otp.h" #include "hw/timer/npcm7xx_timer.h" #include "hw/ssi/npcm7xx_fiu.h" @@ -75,6 +76,7 @@ typedef struct NPCM7xxState { NPCM7xxOTPState key_storage; NPCM7xxOTPState fuse_array; NPCM7xxMCState mc; + NPCM7xxRNGState rng; NPCM7xxFIUState fiu[2]; } NPCM7xxState; diff --git a/include/hw/misc/npcm7xx_rng.h b/include/hw/misc/npcm7xx_rng.h new file mode 100644 index 0000000..5e85fd4 --- /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 */ |