feat: add constants related to filesystem

share/src/file.rs

+bitflags! {
+    pub struct OpenFlag: u32 {
+        const RDONLY = 0x0;
+        const WRONLY = 0x1;
+        const RDWR = 0x2;
+        const CREAT = 0x40;
+        const EXCL = 0x80;
+        const TRUNC = 0x200;
+        const APPEND = 0x400;
+        const DIRECTORY = 0x10000;
+    }
+}
\ No newline at end of file

share/src/ipc.rs

@@ -9,6 +9,9 @@ pub const WRITE: usize = 4;
 pub const IOCTL: usize = 5;
 pub const CLOSE: usize = 6;
 pub const REPLY: usize = 7;
+pub const FORK: usize = 8;  // process to filesystem
+pub const EXIT: usize = 9; // process to filesystem
+pub const FSYSCALL: usize = 10; // process to filesystem, when process inovke filesystem syscall like 'open'
 
 /* Args position constant */
 pub const MSG_ARGS_0: usize = 0;

share/src/lib.rs

@@ -5,6 +5,7 @@ pub mod syscall;
 pub mod util;
 pub mod ffi;
 pub mod terminal;
+pub mod file;
 
 extern crate alloc;
 #[macro_use]

share/src/syscall/sys_const.rs

+// filesystem syscall.
+pub const SYSCALL_GETCWD: usize = 17;
+pub const SYSCALL_DUP: usize = 23;
+pub const SYSCALL_DUP3: usize = 24;
+pub const SYSCALL_MKDIRAT: usize = 34;
+pub const SYSCALL_UNMOUNT: usize = 39;
+pub const SYSCALL_MOUNT: usize = 40;
+pub const SYSCALL_CHDIR: usize = 49;
+pub const SYSCALL_OPEN: usize = 56;
+pub const SYSCALL_CLOSE: usize = 57;
 pub const SYSCALL_READ: usize = 63;
 pub const _SYSCALL_READ: usize = KCALL_MASK | SYSCALL_READ;
 pub const SYSCALL_WRITE: usize = 64;
 pub const _SYSCALL_WRITE: usize = KCALL_MASK | SYSCALL_WRITE;
+
 pub const SYSCALL_EXIT: usize = 93;
 pub const SYSCALL_YIELD: usize = 124;
 pub const SYSCALL_GET_PRIORITY: usize = 140;