Primary volume descriptor unserialization

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

src/drivers/atapi/mod.rs

@@ -248,7 +248,7 @@ impl ATABus {
         self.wait_command_end();
     }
 
-    pub async fn read_block(&mut self, lba: u32) {
+    pub async fn read_block(&mut self, lba: u32) -> [u8; CD_SECTOR_SIZE] {
         let mut packet = SCSIPacket::new();
 
         packet.op_code = SCSI_READ_12;
@@ -277,6 +277,8 @@ impl ATABus {
         //(*INTERRUPT_FUTURE).await;
 
         self.wait_command_end();
+
+        self.block
     }
 
     fn wait_busy(&mut self) {

src/fs/iso/iso9660.rs

@@ -27,14 +27,6 @@ struct IsoPathTable {
 }
 
 impl IsoPathTable {
-    pub fn from(mapping: &u8) -> &Self {
-        let ptr: *const u8 = mapping;
-        let path_table_ptr: *const Self = ptr as *const Self;
-        unsafe {
-            &*path_table_ptr
-        }
-    }
-
     #[allow(unaligned_references)]
     pub fn get_idf(&self) -> &[u8] {
         unsafe {
@@ -77,14 +69,6 @@ pub struct IsoDir {
 }
 
 impl IsoDir {
-    pub fn from(mapping: &u8) -> &Self {
-        let ptr: *const u8 = mapping;
-        let path_table_ptr: *const Self = ptr as *const Self;
-        unsafe {
-            &*path_table_ptr
-        }
-    }
-
     #[allow(unaligned_references)]
     pub fn get_idf(&self) -> &[u8] {
         unsafe {
@@ -96,7 +80,7 @@ impl IsoDir {
 
 // Primary volume descriptor structure
 
-const ISO_PRIM_VOLDESC_BLOCK: usize = 16;
+pub const ISO_PRIM_VOLDESC_BLOCK: u32 = 16;
 
 const ISO_SYSIDF_LEN: usize = 32;
 const ISO_VOLIDF_LEN: usize = 32;
@@ -111,47 +95,47 @@ const ISO_LDATE_LEN: usize = 17;
 
 #[repr(C, packed)]
 pub struct IsoPrimVolDesc {
-    vol_desc_type: u8, // Volume descripto type (1)
-    std_identifier: [u8; 5], // standard identifier ("CD001")
-    vol_desc_version: u8, // Volume descriptor version (1)
+    pub vol_desc_type: u8, // Volume descripto type (1)
+    pub std_identifier: [u8; 5], // standard identifier ("CD001")
+    pub vol_desc_version: u8, // Volume descriptor version (1)
 
-    _unused1: u8,
+    pub _unused1: u8,
 
-    sys_idf: [u8; ISO_SYSIDF_LEN], // System identifier
-    vol_idf: [u8; ISO_VOLIDF_LEN], // Volume identifier
+    pub sys_idf: [u8; ISO_SYSIDF_LEN], // System identifier
+    pub vol_idf: [u8; ISO_VOLIDF_LEN], // Volume identifier
 
-    _unused2: [u8; 8],
+    pub _unused2: [u8; 8],
 
-    vol_blk_count: MultiEndian32, // Number of logical blocks in the volume
+    pub vol_blk_count: MultiEndian32, // Number of logical blocks in the volume
 
-    _unused3: [u8; 32],
+    pub _unused3: [u8; 32],
 
-    vol_set_size: MultiEndian16, // The Volume Set size of the volume
-    vol_seq_num: MultiEndian16, // The number of the volume in the set
-    vol_blk_size: MultiEndian16, // The size in bytes of a logical block
+    pub vol_set_size: MultiEndian16, // The Volume Set size of the volume
+    pub vol_seq_num: MultiEndian16, // The number of the volume in the set
+    pub vol_blk_size: MultiEndian16, // The size in bytes of a logical block
 
-    path_table_size: MultiEndian32, // Length in bytes of the path table
-    le_path_table_blk: u32, // Path table block index little endian
-    le_opt_path_table_blk: u32, // Optionnal path table block index little endian
-    be_path_table_blk: u32,
-    be_opt_path_table_blk: u32,
+    pub path_table_size: MultiEndian32, // Length in bytes of the path table
+    pub le_path_table_blk: u32, // Path table block index little endian
+    pub le_opt_path_table_blk: u32, // Optionnal path table block index little endian
+    pub be_path_table_blk: u32,
+    pub be_opt_path_table_blk: u32,
 
-    root_dir: IsoDir, // Root directory entry
+    pub root_dir: IsoDir, // Root directory entry
 
-    _unused4: [u8; 34 - core::mem::size_of::<IsoDir>()], // Padding
+    pub _unused4: [u8; 34 - core::mem::size_of::<IsoDir>()], // Padding
 
-    volset_idf: [u8; ISO_VOLSET_LEN], // name of the multiple volume set
-    pub_idf: [u8; ISO_PUBIDF_LEN], // Publisher name
-    dprep_idf: [u8; ISO_DPREP_LEN], // Data preparer name
-    app_idf: [u8; ISO_APP_LEN], // Application name
+    pub volset_idf: [u8; ISO_VOLSET_LEN], // name of the multiple volume set
+    pub pub_idf: [u8; ISO_PUBIDF_LEN], // Publisher name
+    pub dprep_idf: [u8; ISO_DPREP_LEN], // Data preparer name
+    pub app_idf: [u8; ISO_APP_LEN], // Application name
 
-    copyright_file: [u8; ISO_CPRFIL_LEN], // Copyright file name in root dir
-    abstract_file: [u8; ISO_ABSFIL_LEN], // Abstract file name in root dir
-    bibli_file: [u8; ISO_BIBFIL_LEN], // Bibliograpgic file name in root dir
-    date_creat: [u8; ISO_LDATE_LEN], // Creation date
-    date_modif: [u8; ISO_LDATE_LEN], // Modification date
-    date_expir: [u8; ISO_LDATE_LEN], // Expiration date
-    date_effect: [u8; ISO_LDATE_LEN], // Effective date
+    pub copyright_file: [u8; ISO_CPRFIL_LEN], // Copyright file name in root dir
+    pub abstract_file: [u8; ISO_ABSFIL_LEN], // Abstract file name in root dir
+    pub bibli_file: [u8; ISO_BIBFIL_LEN], // Bibliograpgic file name in root dir
+    pub date_creat: [u8; ISO_LDATE_LEN], // Creation date
+    pub date_modif: [u8; ISO_LDATE_LEN], // Modification date
+    pub date_expir: [u8; ISO_LDATE_LEN], // Expiration date
+    pub date_effect: [u8; ISO_LDATE_LEN], // Effective date
 
-    file_struct_version: u8, // File structure version (1)
+    pub file_struct_version: u8, // File structure version (1)
 }

src/fs/iso/mod.rs

@@ -1 +1,18 @@
 pub mod iso9660;
+
+use crate::serial_println;
+use crate::drivers::atapi::{DRIVE};
+use crate::utils::unserialize;
+use iso9660::{IsoPrimVolDesc};
+
+pub async fn init_prim_vol_desc() {
+    let desc_block = DRIVE
+        .lock()
+        .as_mut()
+        .unwrap()
+        .read_block(iso9660::ISO_PRIM_VOLDESC_BLOCK)
+        .await;
+    let prim_vol_desc: &IsoPrimVolDesc = unserialize::<IsoPrimVolDesc>(desc_block.as_ptr());
+
+    serial_println!("{:?}", prim_vol_desc.std_identifier);
+}

src/lib.rs

@@ -8,6 +8,7 @@ mod interrupts;
 mod memory;
 mod task;
 mod fs;
+mod utils;
 
 //#[macro_use]
 extern crate alloc;
@@ -56,11 +57,8 @@ pub extern "C" fn julios_main(multiboot_info_addr: usize) -> ! {
     println!("***JuliOS V0.1.0***");
     serial_println!("Hello serial");
 
-    serial_println!("{}", core::mem::size_of::<IsoPrimVolDesc>());
-    serial_println!("{}", core::mem::size_of::<IsoDir>());
-    serial_println!("{}", core::mem::size_of::<MultiEndian32>());
-
     let mut executor = Executor::new();
     executor.spawn(Task::new(keyboard::print_keypresses()));
+    executor.spawn(Task::new(fs::iso::init_prim_vol_desc()));
     executor.run();
 }

src/utils/mod.rs

@@ -0,0 +1,3 @@
+pub mod serialize;
+
+pub use serialize::unserialize;

src/utils/serialize.rs

@@ -0,0 +1,6 @@
+pub fn unserialize<T>(ptr: *const u8) -> &'static T {
+    let path_table_ptr: *const T = ptr as *const T;
+    unsafe {
+        &*path_table_ptr
+    }
+}