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target-arm: Implement BCM2835 hardware RNG

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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>
This commit is contained in:
Marcin Chojnacki
2017-02-28 12:08:13 +00:00
committed by Peter Maydell
parent 6181478f63
commit 54a5ba13a9
5 changed files with 169 additions and 0 deletions
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2
include/hw/arm/bcm2835_peripherals.h
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@ -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;

27
include/hw/misc/bcm2835_rng.h Normal file
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@ -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