Sync computers

src/fs.rs

@@ -2,12 +2,17 @@
 //!
 //! Implements a minimal disk backend and exposes a global FILE_SYSTEM used by
 //! the kernel to load user binaries.
-use core::{cell::UnsafeCell, ops::Deref};
+use core::{
+    cell::{LazyCell, UnsafeCell},
+    ops::Deref,
+};
 
 use bffs::{
     io::{IoBase, Read, Seek},
+    path::Path,
     Fat32FileSystem,
 };
+use hashbrown::HashMap;
 
 const DISK_ADDR: *const u8 = 0x9000_0000 as *const _;
 
@@ -79,10 +84,20 @@ impl Read for Disk {
             return Ok(0);
         }
         let size = usize::min(buf.len(), (self.size - self.pos) as usize);
-        (0..size).for_each(|i| {
-            buf[i] = unsafe { *DISK_ADDR.byte_add(i + self.pos as usize) };
-        });
+        unsafe {
+            core::ptr::copy_nonoverlapping(
+                DISK_ADDR.byte_add(self.pos as usize),
+                buf.as_mut_ptr(),
+                size,
+            );
+        }
         self.pos += size as u64;
         Ok(size)
     }
 }
+
+pub struct KernelFDTable(LazyCell<HashMap<u64, Path<'static>>>);
+
+unsafe impl Sync for KernelFDTable {}
+
+pub static KERNEL_FILE_DESCRIPTOR_TABLE: KernelFDTable = KernelFDTable(LazyCell::new(HashMap::new));