diff options
| author | Marcin Chojnacki <marcinch7@gmail.com> | 2017-02-28 12:08:13 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2017-02-28 12:08:13 +0000 |
| commit | 54a5ba13a9ffe7d25fc649b0fa9f8314734c8ccc (patch) | |
| tree | 969296f64bcd11de22f0971ec334d75ca067c6a5 /include | |
| parent | 6181478f6395cdd9d6ffd99623d0c9f39ea53606 (diff) | |
target-arm: Implement BCM2835 hardware RNG
Recent vanilla Raspberry Pi kernels started to make use of
the hardware random number generator in BCM2835 SoC. As a
result, those kernels wouldn't work anymore under QEMU
but rather just freeze during the boot process.
This patch implements a trivial BCM2835 compatible RNG,
and adds it as a peripheral to BCM2835 platform, which
allows to boot a vanilla Raspberry Pi kernel under Qemu.
Changes since v1:
* Prevented guest from writing [31..20] bits in rng_status
* Removed redundant minimum_version_id_old
* Added field entries for the state
* Changed realize function to reset
Signed-off-by: Marcin Chojnacki <marcinch7@gmail.com>
Message-id: 20170210210857.47893-1-marcinch7@gmail.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/arm/bcm2835_peripherals.h | 2 | ||||
| -rw-r--r-- | include/hw/misc/bcm2835_rng.h | 27 |
2 files changed, 29 insertions, 0 deletions
diff --git a/include/hw/arm/bcm2835_peripherals.h b/include/hw/arm/bcm2835_peripherals.h index e12ae3721a..31241c799d 100644 --- a/include/hw/arm/bcm2835_peripherals.h +++ b/include/hw/arm/bcm2835_peripherals.h @@ -19,6 +19,7 @@ #include "hw/dma/bcm2835_dma.h" #include "hw/intc/bcm2835_ic.h" #include "hw/misc/bcm2835_property.h" +#include "hw/misc/bcm2835_rng.h" #include "hw/misc/bcm2835_mbox.h" #include "hw/sd/sdhci.h" @@ -41,6 +42,7 @@ typedef struct BCM2835PeripheralState { BCM2835DMAState dma; BCM2835ICState ic; BCM2835PropertyState property; + BCM2835RngState rng; BCM2835MboxState mboxes; SDHCIState sdhci; } BCM2835PeripheralState; diff --git a/include/hw/misc/bcm2835_rng.h b/include/hw/misc/bcm2835_rng.h new file mode 100644 index 0000000000..41a531bce7 --- /dev/null +++ b/include/hw/misc/bcm2835_rng.h @@ -0,0 +1,27 @@ +/* + * BCM2835 Random Number Generator emulation + * + * Copyright (C) 2017 Marcin Chojnacki <marcinch7@gmail.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#ifndef BCM2835_RNG_H +#define BCM2835_RNG_H + +#include "hw/sysbus.h" + +#define TYPE_BCM2835_RNG "bcm2835-rng" +#define BCM2835_RNG(obj) \ + OBJECT_CHECK(BCM2835RngState, (obj), TYPE_BCM2835_RNG) + +typedef struct { + SysBusDevice busdev; + MemoryRegion iomem; + + uint32_t rng_ctrl; + uint32_t rng_status; +} BCM2835RngState; + +#endif |