Initialize RngManager

src/kernel/src/fs/dev/cdev.rs

@@ -195,6 +195,7 @@ bitflags! {
     #[derive(Debug, Clone, Copy)]
     pub struct DriverFlags: u32 {
         const D_NEEDMINOR = 0x00800000;
+        const D_INIT = 0x80000000;
     }
 }
 

src/kernel/src/main.rs

@@ -12,6 +12,7 @@ use crate::net::NetManager;
 use crate::osem::OsemManager;
 use crate::process::{VProc, VProcInitError, VThread};
 use crate::regmgr::RegMgr;
+use crate::rng::RngManager;
 use crate::rtld::{LoadFlags, ModuleFlags, RuntimeLinker};
 use crate::shm::SharedMemoryManager;
 use crate::syscalls::Syscalls;
@@ -51,6 +52,7 @@ mod net;
 mod osem;
 mod process;
 mod regmgr;
+mod rng;
 mod rtld;
 mod shm;
 mod signal;
@@ -276,6 +278,7 @@ fn run<E: crate::ee::ExecutionEngine>(
     TimeManager::new(&mut syscalls);
     KernelQueueManager::new(&mut syscalls);
     NetManager::new(&mut syscalls);
+    RngManager::new();
 
     // TODO: Get correct budget name from the PS4.
     let budget_id = budget.create(Budget::new("big app", ProcType::BigApp));

src/kernel/src/rng/mod.rs

@@ -0,0 +1,37 @@
+use std::sync::Arc;
+
+use crate::{
+    errno::Errno,
+    fs::{make_dev, Cdev, CdevSw, DriverFlags, MakeDev, Mode, OpenFlags},
+    process::VThread,
+    ucred::{Gid, Uid},
+};
+
+pub struct RngManager {}
+
+impl RngManager {
+    pub fn new() -> () {
+        let rng_cdevsw = Arc::new(CdevSw::new(DriverFlags::D_INIT, Some(Self::rng_open), None));
+
+        let _rng = make_dev(
+            &rng_cdevsw,
+            0,
+            "rng",
+            Uid::ROOT,
+            Gid::ROOT,
+            Mode::new(0o444).unwrap(),
+            None,
+            MakeDev::MAKEDEV_ETERNAL,
+        );
+    }
+
+    fn rng_open(
+        _rng: &Arc<Cdev>,
+        _flags: OpenFlags,
+        _mode: i32,
+        _td: Option<&VThread>,
+    ) -> Result<(), Box<dyn Errno>> {
+        // true to PS4
+        Ok(())
+    }
+}