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author | Andreas Sandberg <andreas.sandberg@arm.com> | 2016-11-07 18:21:43 +0000 |
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committer | Andreas Sandberg <andreas.sandberg@arm.com> | 2018-06-07 17:33:30 +0000 |
commit | c5c71a751676a5adecad8ac43ec85b6c4c66ebf0 (patch) | |
tree | ade68beb4edf155b37285f9c573bb8e763f24d78 /src/dev/arm/vio_mmio.hh | |
parent | 409fbc653f5177f9f1da91877591a27b27302a3b (diff) | |
download | gem5-c5c71a751676a5adecad8ac43ec85b6c4c66ebf0.tar.xz |
dev-arm: Add a MMIO transport interface for VirtIO
The MMIO interface currently only supports a subset of version 0.9.5
of the VirtIO specification. It has the following known limitations:
* The queue size hint (the QUEUE_NUM register) is ignored.
* Queue alignment is assumed to be hard-coded to
VirtQueue::ALIGN_SIZE (4096 bytes).
* Only 4096 byte pages are currently supported.
Change-Id: Ifd318f5e5bddab0b6a42d8c8af9ff2fbb477f98b
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-by: Rekai Gonzalez Alberquilla <rekai.gonzalezalberquilla@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/2326
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Diffstat (limited to 'src/dev/arm/vio_mmio.hh')
-rw-r--r-- | src/dev/arm/vio_mmio.hh | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/src/dev/arm/vio_mmio.hh b/src/dev/arm/vio_mmio.hh new file mode 100644 index 000000000..5a5144bde --- /dev/null +++ b/src/dev/arm/vio_mmio.hh @@ -0,0 +1,115 @@ +/* + * Copyright (c) 2016-2018 ARM Limited + * All rights reserved + * + * The license below extends only to copyright in the software and shall + * not be construed as granting a license to any other intellectual + * property including but not limited to intellectual property relating + * to a hardware implementation of the functionality of the software + * licensed hereunder. You may use the software subject to the license + * terms below provided that you ensure that this notice is replicated + * unmodified and in its entirety in all distributions of the software, + * modified or unmodified, in source code or in binary form. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Andreas Sandberg + */ + +#ifndef __DEV_ARM_VIO_MMIO_HH__ +#define __DEV_ARM_VIO_MMIO_HH__ + +#include "dev/io_device.hh" +#include "dev/virtio/base.hh" + +class ArmInterruptPin; +struct MmioVirtIOParams; + +class MmioVirtIO : public BasicPioDevice +{ + public: + MmioVirtIO(const MmioVirtIOParams *params); + virtual ~MmioVirtIO(); + + protected: // BasicPioDevice + Tick read(PacketPtr pkt) override; + Tick write(PacketPtr pkt) override; + + protected: + /** @{ */ + /** Offsets into VirtIO MMIO space. */ + + enum : Addr { + OFF_MAGIC = 0x00, + OFF_VERSION = 0x04, + OFF_DEVICE_ID = 0x08, + OFF_VENDOR_ID = 0x0C, + OFF_HOST_FEATURES = 0x10, + OFF_HOST_FEATURES_SELECT = 0x14, + OFF_GUEST_FEATURES = 0x20, + OFF_GUEST_FEATURES_SELECT = 0x24, + OFF_GUEST_PAGE_SIZE = 0x28, + OFF_QUEUE_SELECT = 0x30, + OFF_QUEUE_NUM_MAX = 0x34, + OFF_QUEUE_NUM = 0x38, + OFF_QUEUE_ALIGN = 0x3C, + OFF_QUEUE_PFN = 0x40, + OFF_QUEUE_NOTIFY = 0x50, + OFF_INTERRUPT_STATUS = 0x60, + OFF_INTERRUPT_ACK = 0x64, + OFF_STATUS = 0x70, + OFF_CONFIG = 0x100, + }; + + /** @} */ + + enum { + INT_USED_RING = 1 << 0, + INT_CONFIG = 1 << 1, + }; + + static const uint32_t MAGIC = 0x74726976; + static const uint32_t VERSION = 1; + static const uint32_t VENDOR_ID = 0x1AF4; + + + uint32_t read(Addr offset); + void write(Addr offset, uint32_t value); + + void kick(); + void setInterrupts(uint32_t value); + + uint32_t hostFeaturesSelect; + uint32_t guestFeaturesSelect; + uint32_t pageSize; + uint32_t interruptStatus; + + MakeCallback<MmioVirtIO, &MmioVirtIO::kick> callbackKick; + + protected: // Params + VirtIODeviceBase &vio; + ArmInterruptPin *const interrupt; +}; + +#endif // __DEV_ARM_VIO_MMIO_HH__ |