add basic file descriptor trait architecture

Signed-off-by: Julien CLEMENT <julien.clement@epita.fr>

src/drivers/atapi/mod.rs

@@ -8,7 +8,6 @@ use interrupt::{INTERRUPT_FUTURE};
 use core::convert::TryInto;
 
 use lazy_static::lazy_static;
-use spin::Mutex;
 use crate::utils::AsyncMutex;
 use x86_64::instructions::port::Port;
 

src/fd/mod.rs

@@ -0,0 +1,41 @@
+use crate::utils::AsyncMutex;
+
+use alloc::{collections::BTreeMap, sync::Arc};
+use core::cell::RefCell;
+use lazy_static::lazy_static;
+
+pub type FDt = Arc<RefCell<dyn FileDescriptor>>;
+
+lazy_static! {
+    pub static ref FD_TABLE: AsyncMutex<FDTable> = {
+        AsyncMutex::new(FDTable::new())
+    };
+}
+
+pub struct FDId(u64);
+
+impl FDId {
+    pub fn new() -> Self {
+        // TODO: search for first available fd
+        FDId(1)
+    }
+}
+
+pub struct FDTable {
+    table: BTreeMap<FDId, FDt>,
+}
+
+impl FDTable {
+    pub fn new() -> Self {
+        FDTable { table: BTreeMap::new() }
+    }
+
+    pub fn register_fd(&mut self, fd: FDt) {
+        // TODO
+    }
+}
+
+pub trait FileDescriptor {
+    fn write(&mut self, buf: *const u8, count: usize) -> isize;
+    fn read(&mut self, buf: *mut u8, count: usize) -> isize;
+}

src/fs/iso/fd.rs

@@ -0,0 +1,28 @@
+use crate::println;
+use crate::fd::{FDId, FileDescriptor, FDt};
+
+use alloc::sync::Arc;
+use core::cell::RefCell;
+
+pub struct IsoFD {
+    pub fd: FDId,
+}
+
+impl IsoFD {
+    pub fn new() -> FDt {
+        Arc::new(RefCell::new(IsoFD {
+            fd: FDId::new(),
+        }))
+    }
+}
+
+impl FileDescriptor for IsoFD {
+    fn write(&mut self, buf: *const u8, count: usize) -> isize {
+        0
+    }
+
+    fn read(&mut self, buf: *mut u8, count: usize) -> isize {
+        println!("Read from fd");
+        0
+    }
+}

src/fs/iso/iso9660.rs

@@ -3,12 +3,14 @@ const ISO_BLOCK_SIZE: usize = 2048;
 // Twin values structs
 
 #[repr(C, packed)]
+#[derive(Copy, Clone)]
 pub struct MultiEndian32 {
     le: u32, // Little endian value
     be: u32, // Big endian value
 }
 
 #[repr(C, packed)]
+#[derive(Copy, Clone)]
 pub struct MultiEndian16 {
     le: u16, // Little endian value
     be: u16, // Big endian value
@@ -18,6 +20,7 @@ pub struct MultiEndian16 {
 // Path table structure
 
 #[repr(C, packed)]
+#[derive(Copy, Clone)]
 struct IsoPathTable {
     idf_len: u8, // Identifier name length
     ext_size: u8, // Extended attribute record length
@@ -41,6 +44,7 @@ impl IsoPathTable {
 const ISO_DATE_LEN: usize = 7;
 
 #[repr(u8)]
+#[derive(Copy, Clone)]
 enum IsoFileType {
     HIDDEN = 0x1, // Hidden file
     ISDIR = 0x2, // Directory
@@ -51,6 +55,7 @@ enum IsoFileType {
 }
 
 #[repr(C, packed)]
+#[derive(Copy, Clone)]
 pub struct IsoDir {
     dir_size: u8, // Length of directory record
     ext_size: u8, // Length of extended attribute record
@@ -94,6 +99,7 @@ const ISO_BIBFIL_LEN: usize = 37;
 const ISO_LDATE_LEN: usize = 17;
 
 #[repr(C, packed)]
+#[derive(Copy, Clone)]
 pub struct IsoPrimVolDesc {
     pub vol_desc_type: u8, // Volume descripto type (1)
     pub std_identifier: [u8; 5], // standard identifier ("CD001")

src/fs/iso/mod.rs

@@ -1,11 +1,17 @@
 pub mod iso9660;
+mod fd;
 
 use crate::println;
 use crate::drivers::atapi::{DRIVE};
+use crate::fd::{FDId, FD_TABLE, FDt};
 use crate::utils::unserialize;
-use iso9660::{IsoPrimVolDesc};
 
-pub async fn init_prim_vol_desc() {
+use iso9660::{IsoPrimVolDesc};
+use fd::IsoFD;
+
+use alloc::sync::Arc;
+
+pub async fn get_prim_vol_desc() -> IsoPrimVolDesc {
     let desc_block = DRIVE
         .lock()
         .await
@@ -13,7 +19,11 @@ pub async fn init_prim_vol_desc() {
         .unwrap()
         .read_block(iso9660::ISO_PRIM_VOLDESC_BLOCK)
         .await;
-    let prim_vol_desc: &IsoPrimVolDesc = unserialize::<IsoPrimVolDesc>(desc_block.as_ptr());
+    *unserialize::<IsoPrimVolDesc>(desc_block.as_ptr())
+}
 
-    println!("{:?}", alloc::string::String::from_utf8_lossy(&prim_vol_desc.std_identifier));
+pub async fn open() -> FDt {
+    let fd = IsoFD::new();
+    FD_TABLE.lock().await.register_fd(fd.clone());
+    fd
 }

src/lib.rs

@@ -9,6 +9,7 @@ mod memory;
 mod task;
 mod fs;
 mod utils;
+mod fd;
 
 //#[macro_use]
 extern crate alloc;
@@ -57,6 +58,12 @@ pub extern "C" fn julios_main(multiboot_info_addr: usize) -> ! {
     let mut executor = Executor::new();
     executor.spawn(Task::new(drivers::atapi::init()));
     executor.spawn(Task::new(keyboard::print_keypresses()));
-    executor.spawn(Task::new(fs::iso::init_prim_vol_desc()));
+    executor.spawn(Task::new(get_file()));
     executor.run();
 }
+
+
+async fn get_file() {
+    let fd = fs::iso::open().await;
+    fd.borrow_mut().read(0 as *mut u8, 0);
+}