From 525c024cee96732e5f08333e9addcf507a1512a9 Mon Sep 17 00:00:00 2001
From: gruetzkopf <martin@gruetzkopf.org>
Date: Mon, 20 Jun 2022 10:03:42 +0200
Subject: [PATCH] Minimalistic - "Well-it-enumerates-I-guess" PCI impl

---
 src/main/java/li/cil/oc2/common/Config.java   |   6 +
 .../java/li/cil/oc2/common/block/Blocks.java  |   4 +
 .../oc2/common/block/PciCardCageBlock.java    | 100 +++++++++++++
 .../oc2/common/blockentity/BlockEntities.java |   2 +
 .../blockentity/PciCardCageBlockEntity.java   | 122 +++++++++++++++
 .../device/vm/block/PciCardCageDevice.java    | 139 ++++++++++++++++++
 .../java/li/cil/oc2/common/item/Items.java    |   1 +
 .../oc2/common/vm/AbstractVirtualMachine.java |   1 +
 .../common/vm/device/PciRootPortDevice.java   |  94 ++++++++++++
 .../vm/provider/DeviceTreeProviders.java      |   2 +
 .../provider/PciRootPortDeviceProvider.java   |  48 ++++++
 .../SimpleFramebufferDeviceProvider.java      |   2 +-
 .../cil/oc2/data/ModBlockStateProvider.java   |   3 +
 .../assets/oc2/blockstates/pci_card_cage.json |  34 +++++
 .../oc2/models/block/pci_card_cage.json       |   1 +
 .../assets/oc2/models/item/pci_card_cage.json |   3 +
 .../pci_card_cage/pci_card_cage_atlas0.png    | Bin 0 -> 10103 bytes
 .../pci_card_cage/pci_card_cage_atlas1.png    | Bin 0 -> 1427 bytes
 .../pci_card_cage/pci_card_cage_atlas2.png    | Bin 0 -> 1376 bytes
 .../pci_card_cage/pci_card_cage_atlas3.png    | Bin 0 -> 1599 bytes
 .../pci_card_cage/pci_card_cage_atlas4.png    | Bin 0 -> 9274 bytes
 .../pci_card_cage/pci_card_cage_atlas5.png    | Bin 0 -> 1146 bytes
 .../pci_card_cage/pci_card_cage_atlas6.png    | Bin 0 -> 628 bytes
 23 files changed, 561 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/li/cil/oc2/common/block/PciCardCageBlock.java
 create mode 100644 src/main/java/li/cil/oc2/common/blockentity/PciCardCageBlockEntity.java
 create mode 100644 src/main/java/li/cil/oc2/common/bus/device/vm/block/PciCardCageDevice.java
 create mode 100644 src/main/java/li/cil/oc2/common/vm/device/PciRootPortDevice.java
 create mode 100644 src/main/java/li/cil/oc2/common/vm/provider/PciRootPortDeviceProvider.java
 create mode 100644 src/main/resources/assets/oc2/blockstates/pci_card_cage.json
 create mode 100644 src/main/resources/assets/oc2/models/block/pci_card_cage.json
 create mode 100644 src/main/resources/assets/oc2/models/item/pci_card_cage.json
 create mode 100644 src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas0.png
 create mode 100644 src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas1.png
 create mode 100644 src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas2.png
 create mode 100644 src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas3.png
 create mode 100644 src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas4.png
 create mode 100644 src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas5.png
 create mode 100644 src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas6.png

diff --git a/src/main/java/li/cil/oc2/common/Config.java b/src/main/java/li/cil/oc2/common/Config.java
index 181c90ed..391f321f 100644
--- a/src/main/java/li/cil/oc2/common/Config.java
+++ b/src/main/java/li/cil/oc2/common/Config.java
@@ -20,6 +20,8 @@ public final class Config {
     @Path("energy.blocks") public static int chargerEnergyStorage = 10000;
     @Path("energy.blocks") public static int projectorEnergyPerTick = 20;
     @Path("energy.blocks") public static int projectorEnergyStorage = 2000;
+    @Path("energy.blocks") public static int cardCageEnergyPerTick = 20;
+    @Path("energy.blocks") public static int cardCageEnergyStorage = 2000;
 
     @Path("energy.entities") public static int robotEnergyPerTick = 5;
     @Path("energy.entities") public static int robotEnergyStorage = 750000;
@@ -60,6 +62,10 @@ public final class Config {
         return projectorEnergyStorage > 0 && projectorEnergyPerTick > 0;
     }
 
+    public static boolean cardCagesUseEnergy() {
+        return cardCageEnergyStorage > 0 && cardCageEnergyPerTick > 0;
+    }
+
     public static boolean robotsUseEnergy() {
         return robotEnergyPerTick > 0 && robotEnergyStorage > 0;
     }
diff --git a/src/main/java/li/cil/oc2/common/block/Blocks.java b/src/main/java/li/cil/oc2/common/block/Blocks.java
index 5aacb614..03401466 100644
--- a/src/main/java/li/cil/oc2/common/block/Blocks.java
+++ b/src/main/java/li/cil/oc2/common/block/Blocks.java
@@ -2,8 +2,10 @@
 
 package li.cil.oc2.common.block;
 
+import li.cil.oc2.common.blockentity.VxlanBlockEntity;
 import li.cil.oc2.common.util.RegistryUtils;
 import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.entity.BlockEntityType;
 import net.minecraftforge.registries.DeferredRegister;
 import net.minecraftforge.registries.ForgeRegistries;
 import net.minecraftforge.registries.RegistryObject;
@@ -25,6 +27,8 @@ public final class Blocks {
     public static final RegistryObject<ProjectorBlock> PROJECTOR = BLOCKS.register("projector", ProjectorBlock::new);
     public static final RegistryObject<RedstoneInterfaceBlock> REDSTONE_INTERFACE = BLOCKS.register("redstone_interface", RedstoneInterfaceBlock::new);
     public static final RegistryObject<VxlanBlock> VXLAN_HUB = BLOCKS.register("vxlan_hub", VxlanBlock::new);
+    public static final RegistryObject<PciCardCageBlock> PCI_CARD_CAGE = BLOCKS.register("pci_card_cage", PciCardCageBlock::new);
+
 
     ///////////////////////////////////////////////////////////////////
 
diff --git a/src/main/java/li/cil/oc2/common/block/PciCardCageBlock.java b/src/main/java/li/cil/oc2/common/block/PciCardCageBlock.java
new file mode 100644
index 00000000..978965b9
--- /dev/null
+++ b/src/main/java/li/cil/oc2/common/block/PciCardCageBlock.java
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: MIT */
+
+package li.cil.oc2.common.block;
+
+import li.cil.oc2.common.Config;
+import li.cil.oc2.common.blockentity.BlockEntities;
+import li.cil.oc2.common.blockentity.TickableBlockEntity;
+import li.cil.oc2.common.util.VoxelShapeUtils;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.world.item.context.BlockPlaceContext;
+import net.minecraft.world.level.BlockGetter;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.EntityBlock;
+import net.minecraft.world.level.block.HorizontalDirectionalBlock;
+import net.minecraft.world.level.block.SoundType;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.entity.BlockEntityTicker;
+import net.minecraft.world.level.block.entity.BlockEntityType;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.StateDefinition;
+import net.minecraft.world.level.block.state.properties.BlockStateProperties;
+import net.minecraft.world.level.block.state.properties.BooleanProperty;
+import net.minecraft.world.level.material.Material;
+import net.minecraft.world.phys.shapes.CollisionContext;
+import net.minecraft.world.phys.shapes.Shapes;
+import net.minecraft.world.phys.shapes.VoxelShape;
+
+import javax.annotation.Nullable;
+
+public final class PciCardCageBlock extends HorizontalDirectionalBlock implements EntityBlock, EnergyConsumingBlock {
+    public static final BooleanProperty LIT = BlockStateProperties.LIT;
+
+    // We bake the visual indents on the front and sides into the collision shape, to prevent stuff being
+    // placeable on those sides, such as network connectors, torches, etc.
+    private static final VoxelShape NEG_Z_SHAPE = Shapes.join(Shapes.block(), Shapes.or(
+        Shapes.box(0 / 16f, 2 / 16f, 2 / 16f, 1 / 16f, 6 / 16f, 14 / 16f),
+        Shapes.box(15 / 16f, 2 / 16f, 2 / 16f, 16 / 16f, 6 / 16f, 14 / 16f),
+        Shapes.box(4 / 16f, 4 / 16f, 0 / 16f, 12 / 16f, 12 / 16f, 2 / 16f)
+    ), (a, b) -> a && !b);
+    private static final VoxelShape NEG_X_SHAPE = VoxelShapeUtils.rotateHorizontalClockwise(NEG_Z_SHAPE);
+    private static final VoxelShape POS_Z_SHAPE = VoxelShapeUtils.rotateHorizontalClockwise(NEG_X_SHAPE);
+    private static final VoxelShape POS_X_SHAPE = VoxelShapeUtils.rotateHorizontalClockwise(POS_Z_SHAPE);
+
+    public PciCardCageBlock() {
+        super(Properties
+            .of(Material.METAL)
+            .sound(SoundType.METAL)
+            .lightLevel(state -> state.getValue(LIT) ? 8 : 0)
+            .strength(1.5f, 6.0f));
+        registerDefaultState(getStateDefinition().any()
+            .setValue(FACING, Direction.NORTH)
+            .setValue(LIT, false));
+    }
+
+    ///////////////////////////////////////////////////////////////////
+
+    @Override
+    public int getEnergyConsumption() {
+        if (Config.cardCagesUseEnergy()) {
+            return Config.cardCageEnergyPerTick;
+        } else {
+            return 0;
+        }
+    }
+
+    @Override
+    public BlockEntity newBlockEntity(final BlockPos pos, final BlockState state) {
+        return BlockEntities.PCI_CARD_CAGE.get().create(pos, state);
+    }
+
+    @Nullable
+    @Override
+    public <T extends BlockEntity> BlockEntityTicker<T> getTicker(final Level level, final BlockState state, final BlockEntityType<T> type) {
+        return TickableBlockEntity.createServerTicker(level, type, BlockEntities.PROJECTOR.get());
+    }
+
+    @SuppressWarnings("deprecation")
+    @Override
+    public VoxelShape getShape(final BlockState state, final BlockGetter level, final BlockPos blockPos, final CollisionContext context) {
+        return switch (state.getValue(FACING)) {
+            case NORTH -> NEG_Z_SHAPE;
+            case SOUTH -> POS_Z_SHAPE;
+            case WEST -> NEG_X_SHAPE;
+            default -> POS_X_SHAPE;
+        };
+    }
+
+    @Override
+    public BlockState getStateForPlacement(final BlockPlaceContext context) {
+        return super.defaultBlockState().setValue(FACING, context.getHorizontalDirection().getOpposite());
+    }
+
+    ///////////////////////////////////////////////////////////////////
+
+    protected void createBlockStateDefinition(final StateDefinition.Builder<Block, BlockState> builder) {
+        builder.add(FACING, LIT);
+    }
+}
diff --git a/src/main/java/li/cil/oc2/common/blockentity/BlockEntities.java b/src/main/java/li/cil/oc2/common/blockentity/BlockEntities.java
index b5aa6cbf..0ba86e6c 100644
--- a/src/main/java/li/cil/oc2/common/blockentity/BlockEntities.java
+++ b/src/main/java/li/cil/oc2/common/blockentity/BlockEntities.java
@@ -28,6 +28,8 @@ public final class BlockEntities {
     public static final RegistryObject<BlockEntityType<ProjectorBlockEntity>> PROJECTOR = register(Blocks.PROJECTOR, ProjectorBlockEntity::new);
     public static final RegistryObject<BlockEntityType<RedstoneInterfaceBlockEntity>> REDSTONE_INTERFACE = register(Blocks.REDSTONE_INTERFACE, RedstoneInterfaceBlockEntity::new);
     public static final RegistryObject<BlockEntityType<VxlanBlockEntity>> VXLAN_HUB = register(Blocks.VXLAN_HUB, VxlanBlockEntity::new);
+    public static final RegistryObject<BlockEntityType<PciCardCageBlockEntity>> PCI_CARD_CAGE = register(Blocks.PCI_CARD_CAGE, PciCardCageBlockEntity::new);
+
 
     ///////////////////////////////////////////////////////////////////
 
diff --git a/src/main/java/li/cil/oc2/common/blockentity/PciCardCageBlockEntity.java b/src/main/java/li/cil/oc2/common/blockentity/PciCardCageBlockEntity.java
new file mode 100644
index 00000000..3d9d8dbf
--- /dev/null
+++ b/src/main/java/li/cil/oc2/common/blockentity/PciCardCageBlockEntity.java
@@ -0,0 +1,122 @@
+/* SPDX-License-Identifier: MIT */
+
+package li.cil.oc2.common.blockentity;
+
+import li.cil.oc2.common.Config;
+import li.cil.oc2.common.block.PciCardCageBlock;
+import li.cil.oc2.common.bus.device.vm.block.PciCardCageDevice;
+import li.cil.oc2.common.capabilities.Capabilities;
+import li.cil.oc2.common.energy.FixedEnergyStorage;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Direction;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.level.block.state.BlockState;
+
+import javax.annotation.Nullable;
+
+
+public final class PciCardCageBlockEntity extends ModBlockEntity implements TickableBlockEntity {
+
+    private static final String ENERGY_TAG_NAME = "energy";
+    private static final String HAS_ENERGY_TAG_NAME = "has_energy";
+
+    ///////////////////////////////////////////////////////////////
+
+    private final PciCardCageDevice cardCageDevice = new PciCardCageDevice(this, this::handleMountedChanged);
+    private boolean isMounted, hasEnergy;
+    private final FixedEnergyStorage energy = new FixedEnergyStorage(Config.cardCageEnergyStorage);
+
+
+    ///////////////////////////////////////////////////////////////
+
+    public PciCardCageBlockEntity(final BlockPos pos, final BlockState state) {
+        super(BlockEntities.PCI_CARD_CAGE.get(), pos, state);
+    }
+
+    ///////////////////////////////////////////////////////////////
+
+    private void handleMountedChanged(final boolean value) {
+
+    }
+
+
+    public boolean hasEnergy() {
+        return hasEnergy;
+    }
+
+    @Override
+    public void serverTick() {
+        if (!isMounted) {
+            return;
+        }
+
+        final boolean isPowered;
+        if (Config.cardCagesUseEnergy()) {
+            isPowered = energy.extractEnergy(Config.cardCageEnergyPerTick, true) >= Config.cardCageEnergyPerTick;
+            if (isPowered) {
+                energy.extractEnergy(Config.cardCageEnergyPerTick, false);
+            }
+        } else {
+            isPowered = true;
+        }
+
+
+    }
+
+    @Override
+    public CompoundTag getUpdateTag() {
+        final CompoundTag tag = super.getUpdateTag();
+
+        tag.putBoolean(HAS_ENERGY_TAG_NAME, hasEnergy);
+
+        return tag;
+    }
+
+    @Override
+    public void handleUpdateTag(final CompoundTag tag) {
+        super.handleUpdateTag(tag);
+
+        hasEnergy = tag.getBoolean(HAS_ENERGY_TAG_NAME);
+    }
+
+    @Override
+    protected void saveAdditional(final CompoundTag tag) {
+        super.saveAdditional(tag);
+
+        tag.put(ENERGY_TAG_NAME, energy.serializeNBT());
+    }
+
+    @Override
+    public void load(final CompoundTag tag) {
+        super.load(tag);
+
+        energy.deserializeNBT(tag.getCompound(ENERGY_TAG_NAME));
+    }
+
+
+    @SuppressWarnings("deprecation")
+    @Override
+    public void setBlockState(final BlockState state) {
+        super.setBlockState(state);
+
+    }
+
+    ///////////////////////////////////////////////////////////////
+
+    @Override
+    protected void collectCapabilities(final CapabilityCollector collector, @Nullable final Direction direction) {
+        if (Config.cardCagesUseEnergy()) {
+            collector.offer(Capabilities.energyStorage(), energy);
+        }
+
+        if (direction == getBlockState().getValue(PciCardCageBlock.FACING).getOpposite()) {
+            collector.offer(Capabilities.device(), cardCageDevice);
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////
+
+
+
+
+}
diff --git a/src/main/java/li/cil/oc2/common/bus/device/vm/block/PciCardCageDevice.java b/src/main/java/li/cil/oc2/common/bus/device/vm/block/PciCardCageDevice.java
new file mode 100644
index 00000000..2bfb8050
--- /dev/null
+++ b/src/main/java/li/cil/oc2/common/bus/device/vm/block/PciCardCageDevice.java
@@ -0,0 +1,139 @@
+/* SPDX-License-Identifier: MIT */
+
+package li.cil.oc2.common.bus.device.vm.block;
+
+import it.unimi.dsi.fastutil.booleans.BooleanConsumer;
+import li.cil.oc2.api.bus.device.vm.VMDevice;
+import li.cil.oc2.api.bus.device.vm.VMDeviceLoadResult;
+import li.cil.oc2.api.bus.device.vm.context.VMContext;
+import li.cil.oc2.common.Constants;
+import li.cil.oc2.common.bus.device.util.IdentityProxy;
+import li.cil.oc2.common.bus.device.util.OptionalAddress;
+import li.cil.oc2.common.serialization.BlobStorage;
+import li.cil.oc2.common.util.NBTTagIds;
+import li.cil.oc2.common.vm.device.PciRootPortDevice;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.level.block.entity.BlockEntity;
+
+import javax.annotation.Nullable;
+import java.io.IOException;
+import java.nio.MappedByteBuffer;
+import java.nio.channels.FileChannel;
+import java.util.UUID;
+
+public final class PciCardCageDevice extends IdentityProxy<BlockEntity> implements VMDevice {
+    private static final String ADDRESS_TAG_NAME = "address";
+    private static final String BLOB_HANDLE_TAG_NAME = "blob";
+
+    public static final int BUS_COUNT = 16;
+    public static final int WINDOW_SIZE = 16 * 1024 * 1024;
+
+
+    ///////////////////////////////////////////////////////////////
+
+    private final BooleanConsumer onMountedChanged;
+
+    @Nullable private PciRootPortDevice device;
+
+    ///////////////////////////////////////////////////////////////
+
+    private final OptionalAddress address = new OptionalAddress();
+    @Nullable private UUID blobHandle;
+
+    ///////////////////////////////////////////////////////////////
+
+    public PciCardCageDevice(final BlockEntity identity, final BooleanConsumer onMountedChanged) {
+        super(identity);
+        this.onMountedChanged = onMountedChanged;
+    }
+
+    ///////////////////////////////////////////////////////////////
+
+    @Override
+    public VMDeviceLoadResult mount(final VMContext context) {
+        if (!allocateDevice(context)) {
+            return VMDeviceLoadResult.fail();
+        }
+
+        assert device != null;
+        if (!address.claim(context, device)) {
+            return VMDeviceLoadResult.fail();
+        }
+
+        onMountedChanged.accept(true);
+
+        return VMDeviceLoadResult.success();
+    }
+
+    @Override
+    public void unmount() {
+        final PciRootPortDevice pciRootPortDevice = device;
+        device = null;
+        if (pciRootPortDevice != null) {
+            pciRootPortDevice.close();
+        }
+
+        if (blobHandle != null) {
+            BlobStorage.close(blobHandle);
+        }
+
+        onMountedChanged.accept(false);
+    }
+
+    @Override
+    public void dispose() {
+        if (blobHandle != null) {
+            BlobStorage.delete(blobHandle);
+            blobHandle = null;
+        }
+
+        address.clear();
+    }
+
+    @Override
+    public CompoundTag serializeNBT() {
+        final CompoundTag tag = new CompoundTag();
+
+        if (blobHandle != null) {
+            tag.putUUID(BLOB_HANDLE_TAG_NAME, blobHandle);
+        }
+        if (address.isPresent()) {
+            tag.putLong(ADDRESS_TAG_NAME, address.getAsLong());
+        }
+
+        return tag;
+    }
+
+    @Override
+    public void deserializeNBT(final CompoundTag tag) {
+        if (tag.hasUUID(BLOB_HANDLE_TAG_NAME)) {
+            blobHandle = tag.getUUID(BLOB_HANDLE_TAG_NAME);
+        }
+        if (tag.contains(ADDRESS_TAG_NAME, NBTTagIds.TAG_LONG)) {
+            address.set(tag.getLong(ADDRESS_TAG_NAME));
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////
+
+    private boolean allocateDevice(final VMContext context) {
+        if (!context.getMemoryAllocator().claimMemory(Constants.PAGE_SIZE)) {
+            return false;
+        }
+
+        try {
+            device = createPciRootPortDevice();
+        } catch (final IOException e) {
+            return false;
+        }
+
+        return true;
+    }
+
+    private PciRootPortDevice createPciRootPortDevice() throws IOException {
+        blobHandle = BlobStorage.validateHandle(blobHandle);
+        final FileChannel channel = BlobStorage.getOrOpen(blobHandle);
+        final MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_WRITE, 0, WINDOW_SIZE * 2);
+        return new PciRootPortDevice(BUS_COUNT, WINDOW_SIZE, buffer);
+    }
+}
diff --git a/src/main/java/li/cil/oc2/common/item/Items.java b/src/main/java/li/cil/oc2/common/item/Items.java
index 451c6b89..9f1a275e 100644
--- a/src/main/java/li/cil/oc2/common/item/Items.java
+++ b/src/main/java/li/cil/oc2/common/item/Items.java
@@ -35,6 +35,7 @@ public final class Items {
     public static final RegistryObject<Item> PROJECTOR = register(Blocks.PROJECTOR);
     public static final RegistryObject<Item> REDSTONE_INTERFACE = register(Blocks.REDSTONE_INTERFACE);
     public static final RegistryObject<Item> VXLAN_HUB = register(Blocks.VXLAN_HUB);
+    public static final RegistryObject<Item> PCI_CARD_CAGE = register(Blocks.PCI_CARD_CAGE);
 
     ///////////////////////////////////////////////////////////////////
 
diff --git a/src/main/java/li/cil/oc2/common/vm/AbstractVirtualMachine.java b/src/main/java/li/cil/oc2/common/vm/AbstractVirtualMachine.java
index fc649a81..5defa289 100644
--- a/src/main/java/li/cil/oc2/common/vm/AbstractVirtualMachine.java
+++ b/src/main/java/li/cil/oc2/common/vm/AbstractVirtualMachine.java
@@ -79,6 +79,7 @@ public abstract class AbstractVirtualMachine implements VirtualMachine {
         state.board.getCpu().setFrequency(Constants.CPU_FREQUENCY);
         state.board.setBootArguments("root=/dev/vda rw");
         state.board.setStandardOutputDevice(state.builtinDevices.uart);
+
     }
 
     ///////////////////////////////////////////////////////////////////
diff --git a/src/main/java/li/cil/oc2/common/vm/device/PciRootPortDevice.java b/src/main/java/li/cil/oc2/common/vm/device/PciRootPortDevice.java
new file mode 100644
index 00000000..d75d1ed1
--- /dev/null
+++ b/src/main/java/li/cil/oc2/common/vm/device/PciRootPortDevice.java
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: MIT */
+
+package li.cil.oc2.common.vm.device;
+
+import li.cil.sedna.api.device.MemoryMappedDevice;
+import li.cil.sedna.api.memory.MemoryAccessException;
+import li.cil.sedna.utils.DirectByteBufferUtils;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+
+public final class PciRootPortDevice implements MemoryMappedDevice {
+
+
+    ///////////////////////////////////////////////////////////////
+
+    private final ByteBuffer buffer;
+    private int length;
+
+    ///////////////////////////////////////////////////////////////
+
+    public PciRootPortDevice(final int bus_count, final int window_size, final ByteBuffer buffer) {
+
+        length = window_size * 2;
+        if (buffer.capacity() < length) {
+            throw new IllegalArgumentException("Buffer too small.");
+        }
+
+        this.buffer = buffer.order(ByteOrder.LITTLE_ENDIAN);
+
+        this.buffer.putInt(0, 0x12345678);
+        this.buffer.putInt(4, 0);
+        this.buffer.putInt(8, 0xFF000000);
+        this.buffer.putInt(12, 0x00000101);
+        this.buffer.putInt(16, 0x40000000);
+        this.buffer.putInt(0x2C, 0x12345678);
+
+
+    }
+
+    ///////////////////////////////////////////////////////////////
+
+    public void close() {
+        synchronized (buffer) {
+            length = 0;
+            DirectByteBufferUtils.release(buffer);
+        }
+    }
+
+
+    public boolean hasChanges() {
+        return false;
+    }
+
+
+    @Override
+    public int getLength() {
+        return length;
+    }
+
+    @Override
+    public long load(final int offset, final int sizeLog2) throws MemoryAccessException {
+        if (offset >= 0 && offset <= length - (1 << sizeLog2)) {
+            System.out.println(String.format("PCI config read: %x", offset));
+            return switch (sizeLog2) {
+                case 0 -> buffer.get(offset);
+                case 1 -> buffer.getShort(offset);
+                case 2 -> buffer.getInt(offset);
+                case 3 -> buffer.getLong(offset);
+                default -> throw new IllegalArgumentException();
+            };
+        } else {
+            return 0;
+        }
+    }
+
+    @Override
+    public void store(final int offset, final long value, final int sizeLog2) throws MemoryAccessException {
+        if (offset >= 0 && offset <= length - (1 << sizeLog2)) {
+            System.out.println(String.format("PCI config write: %x %x %x", offset, value, sizeLog2));
+            switch (sizeLog2) {
+                case 0 -> buffer.put(offset, (byte) value);
+                case 1 -> buffer.putShort(offset, (short) value);
+                case 2 -> buffer.putInt(offset, (int) value);
+                case 3 -> buffer.putLong(offset, value);
+                default -> throw new IllegalArgumentException();
+            }
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////
+
+}
diff --git a/src/main/java/li/cil/oc2/common/vm/provider/DeviceTreeProviders.java b/src/main/java/li/cil/oc2/common/vm/provider/DeviceTreeProviders.java
index 5ee7bd4b..912a47f6 100644
--- a/src/main/java/li/cil/oc2/common/vm/provider/DeviceTreeProviders.java
+++ b/src/main/java/li/cil/oc2/common/vm/provider/DeviceTreeProviders.java
@@ -2,11 +2,13 @@
 
 package li.cil.oc2.common.vm.provider;
 
+import li.cil.oc2.common.vm.device.PciRootPortDevice;
 import li.cil.oc2.common.vm.device.SimpleFramebufferDevice;
 import li.cil.sedna.devicetree.DeviceTreeRegistry;
 
 public final class DeviceTreeProviders {
     public static void initialize() {
         DeviceTreeRegistry.putProvider(SimpleFramebufferDevice.class, new SimpleFramebufferDeviceProvider());
+        DeviceTreeRegistry.putProvider(PciRootPortDevice.class, new PciRootPortDeviceProvider());
     }
 }
diff --git a/src/main/java/li/cil/oc2/common/vm/provider/PciRootPortDeviceProvider.java b/src/main/java/li/cil/oc2/common/vm/provider/PciRootPortDeviceProvider.java
new file mode 100644
index 00000000..162323ca
--- /dev/null
+++ b/src/main/java/li/cil/oc2/common/vm/provider/PciRootPortDeviceProvider.java
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: MIT */
+
+package li.cil.oc2.common.vm.provider;
+
+import li.cil.oc2.common.vm.device.PciRootPortDevice;
+import li.cil.sedna.api.device.Device;
+import li.cil.sedna.api.device.MemoryMappedDevice;
+import li.cil.sedna.api.devicetree.DeviceNames;
+import li.cil.sedna.api.devicetree.DevicePropertyNames;
+import li.cil.sedna.api.devicetree.DeviceTree;
+import li.cil.sedna.api.devicetree.DeviceTreeProvider;
+import li.cil.sedna.api.memory.MappedMemoryRange;
+import li.cil.sedna.api.memory.MemoryMap;
+
+import java.util.Optional;
+
+public final class PciRootPortDeviceProvider implements DeviceTreeProvider {
+    @Override
+    public Optional<String> getName(final Device device) {
+        return Optional.of("pci");
+    }
+
+    @Override
+    public Optional<DeviceTree> createNode(final DeviceTree root, final MemoryMap memoryMap, final Device device, final String deviceName) {
+        final Optional<MappedMemoryRange> range = memoryMap.getMemoryRange((MemoryMappedDevice) device);
+        return range.map(r -> {
+            final DeviceTree chosen = root.find("/soc");
+            //chosen.addProp(DevicePropertyNames.RANGES);
+
+            return chosen.getChild(deviceName, r.address());
+        });
+    }
+
+    @Override
+    public void visit(final DeviceTree node, final MemoryMap memoryMap, final Device device) {
+        final PciRootPortDevice pr = (PciRootPortDevice) device;
+        final Optional<MappedMemoryRange> range = memoryMap.getMemoryRange((MemoryMappedDevice) device);
+        node
+            .addProp(DevicePropertyNames.COMPATIBLE, "pci-host-cam-generic")
+            .addProp(DevicePropertyNames.DEVICE_TYPE, DeviceNames.PCI)
+            .addProp(DevicePropertyNames.NUM_ADDRESS_CELLS,3)
+            .addProp(DevicePropertyNames.NUM_SIZE_CELLS, 2)
+            .addProp("bus-range", 0, 1)
+            .addProp("linux,pci-probe-only", 1)
+            .addProp(DevicePropertyNames.RANGES, 0x02000000, 0, 0x40000000, 0x40000000, 0, 0x20000000);
+    }
+}
+
diff --git a/src/main/java/li/cil/oc2/common/vm/provider/SimpleFramebufferDeviceProvider.java b/src/main/java/li/cil/oc2/common/vm/provider/SimpleFramebufferDeviceProvider.java
index ac165c3c..1482009c 100644
--- a/src/main/java/li/cil/oc2/common/vm/provider/SimpleFramebufferDeviceProvider.java
+++ b/src/main/java/li/cil/oc2/common/vm/provider/SimpleFramebufferDeviceProvider.java
@@ -24,7 +24,7 @@ public final class SimpleFramebufferDeviceProvider implements DeviceTreeProvider
         final Optional<MappedMemoryRange> range = memoryMap.getMemoryRange((MemoryMappedDevice) device);
         return range.map(r -> {
             final DeviceTree chosen = root.find("/chosen");
-            chosen.addProp(DevicePropertyNames.RANGES);
+            //chosen.addProp(DevicePropertyNames.RANGES);
 
             return chosen.getChild(deviceName, r.address());
         });
diff --git a/src/main/java/li/cil/oc2/data/ModBlockStateProvider.java b/src/main/java/li/cil/oc2/data/ModBlockStateProvider.java
index 30d6964f..d67dcb1c 100644
--- a/src/main/java/li/cil/oc2/data/ModBlockStateProvider.java
+++ b/src/main/java/li/cil/oc2/data/ModBlockStateProvider.java
@@ -28,6 +28,8 @@ public final class ModBlockStateProvider extends BlockStateProvider {
     private static final ResourceLocation NETWORK_HUB_MODEL = new ResourceLocation(API.MOD_ID, "block/network_hub");
     private static final ResourceLocation PROJECTOR_MODEL = new ResourceLocation(API.MOD_ID, "block/projector");
     private static final ResourceLocation REDSTONE_INTERFACE_MODEL = new ResourceLocation(API.MOD_ID, "block/redstone_interface");
+    private static final ResourceLocation PCI_CARD_CAGE_MODEL = new ResourceLocation(API.MOD_ID, "block/pci_card_cage");
+
 
     public ModBlockStateProvider(final DataGenerator generator, final ExistingFileHelper existingFileHelper) {
         super(generator, API.MOD_ID, existingFileHelper);
@@ -57,6 +59,7 @@ public final class ModBlockStateProvider extends BlockStateProvider {
         horizontalBlock(Blocks.NETWORK_SWITCH, Items.NETWORK_SWITCH, NETWORK_HUB_MODEL);
         horizontalBlock(Blocks.PROJECTOR, Items.PROJECTOR, PROJECTOR_MODEL);
         horizontalBlock(Blocks.REDSTONE_INTERFACE, Items.REDSTONE_INTERFACE, REDSTONE_INTERFACE_MODEL);
+        horizontalBlock(Blocks.PCI_CARD_CAGE, Items.PCI_CARD_CAGE, PCI_CARD_CAGE_MODEL);
 
         registerCableStates();
     }
diff --git a/src/main/resources/assets/oc2/blockstates/pci_card_cage.json b/src/main/resources/assets/oc2/blockstates/pci_card_cage.json
new file mode 100644
index 00000000..769b106f
--- /dev/null
+++ b/src/main/resources/assets/oc2/blockstates/pci_card_cage.json
@@ -0,0 +1,34 @@
+{
+  "variants": {
+    "facing=north,lit=false": {
+      "model": "oc2:block/pci_card_cage"
+    },
+    "facing=south,lit=false": {
+      "model": "oc2:block/pci_card_cage",
+      "y": 180
+    },
+    "facing=west,lit=false": {
+      "model": "oc2:block/pci_card_cage",
+      "y": 270
+    },
+    "facing=east,lit=false": {
+      "model": "oc2:block/pci_card_cage",
+      "y": 90
+    },
+    "facing=north,lit=true": {
+      "model": "oc2:block/pci_card_cage"
+    },
+    "facing=south,lit=true": {
+      "model": "oc2:block/pci_card_cage",
+      "y": 180
+    },
+    "facing=west,lit=true": {
+      "model": "oc2:block/pci_card_cage",
+      "y": 270
+    },
+    "facing=east,lit=true": {
+      "model": "oc2:block/pci_card_cage",
+      "y": 90
+    }
+  }
+}
diff --git a/src/main/resources/assets/oc2/models/block/pci_card_cage.json b/src/main/resources/assets/oc2/models/block/pci_card_cage.json
new file mode 100644
index 00000000..1267853b
--- /dev/null
+++ b/src/main/resources/assets/oc2/models/block/pci_card_cage.json
@@ -0,0 +1 @@
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diff --git a/src/main/resources/assets/oc2/models/item/pci_card_cage.json b/src/main/resources/assets/oc2/models/item/pci_card_cage.json
new file mode 100644
index 00000000..b01fc003
--- /dev/null
+++ b/src/main/resources/assets/oc2/models/item/pci_card_cage.json
@@ -0,0 +1,3 @@
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+}
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diff --git a/src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas1.png b/src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas1.png
new file mode 100644
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diff --git a/src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas3.png b/src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas3.png
new file mode 100644
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new file mode 100644
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diff --git a/src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas5.png b/src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas5.png
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diff --git a/src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas6.png b/src/main/resources/assets/oc2/textures/block/pci_card_cage/pci_card_cage_atlas6.png
new file mode 100644
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