Initial rcore router device support

kernel/src/arch/riscv32/board/rocket_chip/device.dts

@@ -100,6 +100,13 @@
                                 compatible = "xlnx,xps-intc-1.00.a";
                                 reg = <0x61200000 0x1000>;
                                 interrupt-parent = <&L10>;
+                                interrupts = <0>;
+                        };
+
+                        router: router@64A00000 {
+                                compatible = "rcore,router";
+                                reg = <0x64A00000 0x1000>;
+                                interrupt-parent = <&L10>;
                                 interrupts = <1>;
                         };
                 };

kernel/src/arch/riscv32/board/rocket_chip/mod.rs

@@ -1,19 +1,22 @@
 use super::consts::KERNEL_OFFSET;
+use crate::memory::active_table;
+use rcore_memory::paging::PageTable;
 
 /// Mask all external interrupt except serial.
 pub unsafe fn init_external_interrupt() {
     const HART0_S_MODE_INTERRUPT_ENABLES: *mut u64 = (KERNEL_OFFSET + 0x0C00_2080) as *mut u64;
+    // enable all external interrupts
     HART0_S_MODE_INTERRUPT_ENABLES.write_volatile(0xf);
 
     // mask interrupts first
-    const AXI_INTC_IER: *mut u32 = (KERNEL_OFFSET + 0x1900_0008) as *mut u32;
+    const AXI_INTC_IER: *mut u32 = (KERNEL_OFFSET + 0x1810_0008) as *mut u32;
     AXI_INTC_IER.write_volatile(0x0);
 
     // acknowledge all interrupts
-    const AXI_INTC_IAR: *mut u32 = (KERNEL_OFFSET + 0x1900_000C) as *mut u32;
+    const AXI_INTC_IAR: *mut u32 = (KERNEL_OFFSET + 0x1810_000C) as *mut u32;
     AXI_INTC_IAR.write_volatile(0xffffffff);
 
-    const AXI_INTC_MER: *mut u32 = (KERNEL_OFFSET + 0x1900_001C) as *mut u32;
+    const AXI_INTC_MER: *mut u32 = (KERNEL_OFFSET + 0x1810_001C) as *mut u32;
     // Hardware Interrupt enable | Enable irq output
     AXI_INTC_MER.write_volatile(0b11);
 
@@ -32,7 +35,7 @@ pub unsafe fn handle_external_interrupt() {
     HART0_S_MODE_INTERRUPT_CLAIM_COMPLETE.write_volatile(source);
 
     // acknowledge all interrupts
-    const AXI_INTC_IAR: *mut u32 = (KERNEL_OFFSET + 0x1900_000C) as *mut u32;
+    const AXI_INTC_IAR: *mut u32 = (KERNEL_OFFSET + 0x1810_000C) as *mut u32;
     AXI_INTC_IAR.write_volatile(0xffffffff);
 }
 

kernel/src/arch/riscv32/memory.rs

@@ -154,12 +154,21 @@ fn remap_the_kernel(dtb: usize) {
     // map AXI INTC for Rocket Chip
     #[cfg(feature = "board_rocket_chip")]
     ms.push(
-        KERNEL_OFFSET + 0x19000000,
+        KERNEL_OFFSET + 0x18100000,
-        KERNEL_OFFSET + 0x19000000 + PAGE_SIZE,
+        KERNEL_OFFSET + 0x18100000 + PAGE_SIZE,
         MemoryAttr::default(),
-        Linear::new(-(KERNEL_OFFSET as isize + 0x19000000 - 0x61200000)),
+        Linear::new(-(KERNEL_OFFSET as isize + 0x18100000 - 0x61200000)),
         "axi_intc",
     );
+    // map AXI4-Stream Data FIFO for Rocket Chip
+    #[cfg(feature = "board_rocket_chip")]
+    ms.push(
+        KERNEL_OFFSET + 0x18200000,
+        KERNEL_OFFSET + 0x18200000 + PAGE_SIZE,
+        MemoryAttr::default(),
+        Linear::new(-(KERNEL_OFFSET as isize + 0x18200000 - 0x64A00000)),
+        "router",
+    );
     unsafe {
         ms.activate();
     }

kernel/src/drivers/device_tree.rs

@@ -4,6 +4,7 @@ use core::slice;
 use device_tree::{DeviceTree, Node};
 
 use super::bus::virtio_mmio::virtio_probe;
+use super::net::router::router_init;
 use super::CMDLINE;
 
 const DEVICE_TREE_MAGIC: u32 = 0xd00dfeed;
@@ -14,6 +15,9 @@ fn walk_dt_node(dt: &Node) {
         if compatible == "virtio,mmio" {
             virtio_probe(dt);
         }
+        if compatible == "rcore,router" {
+            router_init();
+        }
         // TODO: initial other devices (16650, etc.)
     }
     if let Ok(bootargs) = dt.prop_str("bootargs") {

kernel/src/drivers/net/mod.rs

@@ -1,3 +1,4 @@
 pub mod e1000;
 pub mod ixgbe;
 pub mod virtio_net;
+pub mod router;

kernel/src/drivers/net/router.rs

@@ -0,0 +1,198 @@
+//! rCore Router Driver
+
+use alloc::collections::BTreeMap;
+use alloc::string::String;
+use alloc::sync::Arc;
+use alloc::vec::Vec;
+
+use smoltcp::iface::*;
+use smoltcp::phy::{self, DeviceCapabilities};
+use smoltcp::time::Instant;
+use smoltcp::wire::*;
+use smoltcp::Result;
+
+use rcore_memory::PAGE_SIZE;
+
+use crate::drivers::provider::Provider;
+use crate::net::SOCKETS;
+use crate::sync::SpinNoIrqLock as Mutex;
+
+use super::super::{DeviceType, Driver, DRIVERS, NET_DRIVERS, SOCKET_ACTIVITY};
+use crate::consts::{KERNEL_OFFSET, MEMORY_END, MEMORY_OFFSET};
+
+const AXI_STREAM_FIFO_ISR: *mut u32 = (KERNEL_OFFSET + 0x1820_0000) as *mut u32;
+const AXI_STREAM_FIFO_IER: *mut u32 = (KERNEL_OFFSET + 0x1820_0004) as *mut u32;
+const AXI_STREAM_FIFO_RDFR: *mut u32 = (KERNEL_OFFSET + 0x1820_0018) as *mut u32;
+const AXI_STREAM_FIFO_RDFO: *mut u32 = (KERNEL_OFFSET + 0x1820_001C) as *mut u32;
+const AXI_STREAM_FIFO_RDFD: *mut u32 = (KERNEL_OFFSET + 0x1820_0020) as *mut u32;
+const AXI_STREAM_FIFO_RLR: *mut u32 = (KERNEL_OFFSET + 0x1820_0024) as *mut u32;
+const AXI_STREAM_FIFO_RDR: *mut u32 = (KERNEL_OFFSET + 0x1820_0030) as *mut u32;
+
+pub struct Router {
+    buffer: Vec<Vec<u8>>
+}
+
+impl Router {
+    fn transmit_available(&self) -> bool {
+        false
+    }
+
+    fn receive_available(&self) -> bool {
+        false
+    }
+}
+
+#[derive(Clone)]
+pub struct RouterDriver(Arc<Mutex<Router>>);
+
+pub struct RouterRxToken(RouterDriver);
+pub struct RouterTxToken(RouterDriver);
+
+impl<'a> phy::Device<'a> for RouterDriver {
+    type RxToken = RouterRxToken;
+    type TxToken = RouterTxToken;
+
+    fn receive(&'a mut self) -> Option<(Self::RxToken, Self::TxToken)> {
+        let driver = self.0.lock();
+        if driver.transmit_available() && driver.receive_available() {
+            // potential racing
+            Some((
+                RouterRxToken(self.clone()),
+                RouterTxToken(self.clone()),
+            ))
+        } else {
+            None
+        }
+    }
+
+    fn transmit(&'a mut self) -> Option<Self::TxToken> {
+        let driver = self.0.lock();
+        if driver.transmit_available() {
+            Some(RouterTxToken(self.clone()))
+        } else {
+            None
+        }
+    }
+
+    fn capabilities(&self) -> DeviceCapabilities {
+        let mut caps = DeviceCapabilities::default();
+        caps.max_transmission_unit = 1536;
+        caps.max_burst_size = Some(1);
+        caps
+    }
+}
+
+impl phy::RxToken for RouterRxToken {
+    fn consume<R, F>(self, _timestamp: Instant, f: F) -> Result<R>
+    where
+        F: FnOnce(&[u8]) -> Result<R>,
+    {
+        unimplemented!()
+    }
+}
+
+impl phy::TxToken for RouterTxToken {
+    fn consume<R, F>(self, _timestamp: Instant, len: usize, f: F) -> Result<R>
+    where
+        F: FnOnce(&mut [u8]) -> Result<R>,
+    {
+        unimplemented!()
+    }
+}
+
+pub struct RouterInterface {
+    iface: Mutex<EthernetInterface<'static, 'static, 'static, RouterDriver>>,
+    driver: RouterDriver,
+}
+
+impl Driver for RouterInterface {
+    fn try_handle_interrupt(&self, _irq: Option<u32>) -> bool {
+        let mut driver = self.driver.0.lock();
+
+        let isr = unsafe {
+            AXI_STREAM_FIFO_ISR.read_volatile()
+        };
+
+        if isr > 0 {
+            info!("handle router interrupt {:b}", isr);
+            unsafe {
+                AXI_STREAM_FIFO_ISR.write(isr);
+                let rdfo = AXI_STREAM_FIFO_RDFO.read_volatile();
+                if rdfo > 0 {
+                    let mut buffer = Vec::new();
+                    let rlr = AXI_STREAM_FIFO_RLR.read_volatile();
+                    let rdr = AXI_STREAM_FIFO_RDR.read_volatile();
+                    for i in 0..rdfo {
+                        buffer.push(AXI_STREAM_FIFO_RDFD.read_volatile() as u8);
+                    }
+                    info!("got packet of length {}", rdfo);
+                    driver.buffer.push(buffer);
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+
+    fn device_type(&self) -> DeviceType {
+        DeviceType::Net
+    }
+
+    fn get_id(&self) -> String {
+        format!("router")
+    }
+
+    fn get_mac(&self) -> EthernetAddress {
+        unimplemented!()
+    }
+
+    fn get_ifname(&self) -> String {
+        format!("router")
+    }
+
+    fn ipv4_address(&self) -> Option<Ipv4Address> {
+        unimplemented!()
+    }
+
+    fn poll(&self) {
+        unimplemented!()
+    }
+}
+
+pub fn router_init(
+) -> Arc<RouterInterface> {
+    let ethernet_addr = EthernetAddress::from_bytes(&[2, 2, 3, 3, 0, 0]);
+
+    let net_driver = RouterDriver(Arc::new(Mutex::new(Router {
+        buffer: Vec::new()
+    })));
+
+    let ip_addrs = [IpCidr::new(IpAddress::v4(10, 0, 0, 1), 24), IpCidr::new(IpAddress::v4(10, 0, 1, 1), 24)];
+    let neighbor_cache = NeighborCache::new(BTreeMap::new());
+    let routes = Routes::new(BTreeMap::new());
+    let iface = EthernetInterfaceBuilder::new(net_driver.clone())
+        .ethernet_addr(ethernet_addr)
+        .ip_addrs(ip_addrs)
+        .neighbor_cache(neighbor_cache)
+        .routes(routes)
+        .finalize();
+
+    info!("router interface up");
+
+    let router_iface = RouterInterface {
+        iface: Mutex::new(iface),
+        driver: net_driver
+    };
+
+    let driver = Arc::new(router_iface);
+    DRIVERS.write().push(driver.clone());
+    NET_DRIVERS.write().push(driver.clone());
+
+    const AXI_STREAM_FIFO_IER: *mut u32 = (KERNEL_OFFSET + 0x1820_0004) as *mut u32;
+    // Enable Receive Complete Interrupt
+    unsafe {
+        AXI_STREAM_FIFO_IER.write_volatile(1 << 26);
+    }
+
+    driver
+}