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adc594a7e6
The read_config and write_config functions in the generic virtio headers used by all drivers lead to compiler warnings resp. errors if effective-c++ switch is enabled. Moreover, the functions require to define the access width as parameter. We can better turn them into template functions using the value type to read resp. write to derive the access width. Ref genodelabs/genode#4344
251 lines
7.1 KiB
C++
251 lines
7.1 KiB
C++
/*
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* \brief VirtIO PCI device
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* \author Piotr Tworek
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* \date 2019-09-27
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*/
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/*
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* Copyright (C) 2020 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__VIRTIO__PCI_DEVICE_H_
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#define _INCLUDE__VIRTIO__PCI_DEVICE_H_
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#include <platform_session/device.h>
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#include <virtio/queue.h>
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namespace Virtio {
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using namespace Genode;
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struct Device_mmio;
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class Device;
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}
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struct Virtio::Device_mmio : public Genode::Mmio
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{
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struct DeviceFeatureSelect : Register<0x00, 32> { };
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struct DeviceFeature : Register<0x04, 32> { };
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struct DriverFeatureSelect : Register<0x08, 32> { };
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struct DriverFeature : Register<0x0C, 32> { };
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struct MsiXConfig : Register<0x10, 16> { };
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struct NumQueues : Register<0x12, 16> { };
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struct DeviceStatus : Register<0x14, 8> { };
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struct ConfigGeneration : Register<0x15, 8> { };
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struct QueueSelect : Register<0x16, 16> { };
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struct QueueSize : Register<0x18, 16> { };
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struct QueueMsixVector : Register<0x1A, 16> { };
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struct QueueEnable : Register<0x1C, 16> { };
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struct QueueNotifyOff : Register<0x1E, 16> { };
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struct QueueDescLow : Register<0x20, 32> { };
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struct QueueDescHigh : Register<0x24, 32> { };
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struct QueueAvailLow : Register<0x28, 32> { };
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struct QueueAvailHigh : Register<0x2C, 32> { };
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struct QueueUsedLow : Register<0x30, 32> { };
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struct QueueUsedHigh : Register<0x34, 32> { };
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template <typename T> class Config :
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public Register_array<0x0, sizeof(T)*8,
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256/sizeof(T), sizeof(T)*8> {};
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struct IrqReason : Register<0x0, 32> { };
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using Mmio::Mmio;
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};
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class Virtio::Device
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{
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public:
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struct Configuration_failed : Genode::Exception { };
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enum Status : uint8_t
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{
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RESET = 0,
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ACKNOWLEDGE = 1 << 0,
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DRIVER = 1 << 1,
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DRIVER_OK = 1 << 2,
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FEATURES_OK = 1 << 3,
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FAILED = 1 << 7,
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};
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enum Access_size : uint8_t
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{
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ACCESS_8BIT,
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ACCESS_16BIT,
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ACCESS_32BIT,
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};
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private:
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/*
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* Noncopyable
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*/
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Device(Device const &) = delete;
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Device &operator = (Device const &) = delete;
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enum {
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VIRTIO_PCI_BASE_ID = 0x1040,
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VIRTIO_MSI_NO_VECTOR = 0xffff,
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MMIO_MAX = 6U
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};
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Env & _env;
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Platform::Connection & _plat;
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Platform::Device _device { _plat };
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Platform::Device::Irq _irq { _device, { 0 } };
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Constructible<Platform::Device::Mmio> _mmio[MMIO_MAX] { };
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Mmio _cfg_common { _bar_offset("common") };
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Mmio _dev_config { _bar_offset("device") };
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Mmio _notify { _bar_offset("notify") };
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Mmio _isr { _bar_offset("irq_status") };
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size_t _notify_offset_multiplier { 0 };
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template <typename FN>
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void with_virtio_range(String<16> type, FN const & fn)
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{
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_plat.update();
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_plat.with_xml([&] (Xml_node xml) {
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xml.with_optional_sub_node("device", [&] (Xml_node xml) {
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xml.with_optional_sub_node("pci-config",
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[&] (Xml_node xml) {
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xml.for_each_sub_node("virtio_range",
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[&] (Xml_node xml) {
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if (xml.attribute_value("type", String<16>()) ==
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type)
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fn(xml);
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});
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});
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});
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});
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}
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addr_t _bar_offset(String<16> type)
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{
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unsigned idx = MMIO_MAX;
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addr_t off = ~0UL;
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with_virtio_range(type, [&] (Xml_node xml) {
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idx = xml.attribute_value<unsigned>("index", MMIO_MAX);
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off = xml.attribute_value("offset", ~0UL);
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});
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if (idx >= MMIO_MAX || off == ~0UL)
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throw Configuration_failed();
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if (!_mmio[idx].constructed())
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_mmio[idx].construct(_device,
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Platform::Device::Mmio::Index{idx});
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return _mmio[idx]->base() + off;
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}
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public:
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Device(Genode::Env & env,
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Platform::Connection & plat)
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: _env(env), _plat(plat)
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{
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with_virtio_range("notify", [&] (Xml_node xml) {
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_notify_offset_multiplier = xml.attribute_value("factor", 0UL);
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});
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_cfg_common.write<Device_mmio::MsiXConfig>(VIRTIO_MSI_NO_VECTOR);
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}
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uint8_t get_status() {
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return _cfg_common.read<Device_mmio::DeviceStatus>(); }
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bool set_status(uint8_t status)
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{
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_cfg_common.write<Device_mmio::DeviceStatus>(status);
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return _cfg_common.read<Device_mmio::DeviceStatus>() == status;
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}
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uint32_t get_features(uint32_t selection)
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{
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_cfg_common.write<Device_mmio::DeviceFeatureSelect>(selection);
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return _cfg_common.read<Device_mmio::DeviceFeature>();
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}
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void set_features(uint32_t selection, uint32_t features)
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{
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_cfg_common.write<Device_mmio::DriverFeatureSelect>(selection);
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_cfg_common.write<Device_mmio::DriverFeature>(features);
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}
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uint8_t get_config_generation() {
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return _cfg_common.read<Device_mmio::ConfigGeneration>(); }
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uint16_t get_max_queue_size(uint16_t queue_index)
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{
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_cfg_common.write<Device_mmio::QueueSelect>(queue_index);
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return _cfg_common.read<Device_mmio::QueueSize>();
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}
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template <typename T>
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T read_config(const uint8_t offset)
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{
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static_assert(sizeof(T) <= 4);
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return _dev_config.read<Device_mmio::Config<T>>(offset >> log2(sizeof(T)));
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}
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template <typename T>
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void write_config(const uint8_t offset, const T value)
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{
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static_assert(sizeof(T) <= 4);
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_dev_config.write<Device_mmio::Config<T>>(value,
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(offset >> log2(sizeof(T))));
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}
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bool configure_queue(uint16_t queue_index, Virtio::Queue_description desc)
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{
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_cfg_common.write<Device_mmio::QueueSelect>(queue_index);
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if (_cfg_common.read<Device_mmio::QueueEnable>()) {
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warning("VirtIO queues can't be re-configured after being enabled!");
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return false;
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}
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_cfg_common.write<Device_mmio::QueueMsixVector>(VIRTIO_MSI_NO_VECTOR);
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if (_cfg_common.read<Device_mmio::QueueMsixVector>() != VIRTIO_MSI_NO_VECTOR) {
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error("Failed to disable MSI-X for queue ", queue_index);
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return false;
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}
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_cfg_common.write<Device_mmio::QueueSize>(desc.size);
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uint64_t addr = desc.desc;
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_cfg_common.write<Device_mmio::QueueDescLow>((uint32_t)addr);
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_cfg_common.write<Device_mmio::QueueDescHigh>((uint32_t)(addr >> 32));
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addr = desc.avail;
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_cfg_common.write<Device_mmio::QueueAvailLow>((uint32_t)addr);
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_cfg_common.write<Device_mmio::QueueAvailHigh>((uint32_t)(addr >> 32));
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addr = desc.used;
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_cfg_common.write<Device_mmio::QueueUsedLow>((uint32_t)addr);
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_cfg_common.write<Device_mmio::QueueUsedHigh>((uint32_t)(addr >> 32));
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_cfg_common.write<Device_mmio::QueueEnable>(1);
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return _cfg_common.read<Device_mmio::QueueEnable>() != 0;
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}
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void notify_buffers_available(uint16_t queue_index) {
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_cfg_common.write<Device_mmio::QueueSelect>(queue_index);
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auto const offset = _cfg_common.read<Device_mmio::QueueNotifyOff>();
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auto const addr = (offset * _notify_offset_multiplier >> 1) + 1;
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*(uint16_t*)(_notify.base() + addr) = queue_index;
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}
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uint32_t read_isr() {
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return _isr.read<Device_mmio::IrqReason>(); }
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void irq_sigh(Signal_context_capability cap) {
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_irq.sigh(cap); }
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void irq_ack() { _irq.ack(); }
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};
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#endif /* _INCLUDE__VIRTIO__PCI_DEVICE_H_ */
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