create virtual vga file, now can draw fb on user state

kernel/src/arch/x86_64/io.rs

@@ -24,9 +24,9 @@ pub fn putfmt(fmt: Arguments) {
             COM1.force_unlock();
         }
         COM1.lock().write_fmt(fmt).unwrap();
-        unsafe { CONSOLE.force_unlock() }
-        if let Some(console) = CONSOLE.lock().as_mut() {
-            console.write_fmt(fmt).unwrap();
-        }
+        //unsafe { CONSOLE.force_unlock() }
+        //if let Some(console) = CONSOLE.lock().as_mut() {
+            //console.write_fmt(fmt).unwrap();
+        //}
     }
 }

kernel/src/fs/mod.rs

@@ -11,6 +11,7 @@ pub use self::file_like::*;
 pub use self::pipe::Pipe;
 pub use self::pseudo::*;
 pub use self::stdio::{STDIN, STDOUT};
+pub use self::vga::*;
 
 mod device;
 mod file;
@@ -19,6 +20,7 @@ mod ioctl;
 mod pipe;
 mod pseudo;
 mod stdio;
+mod vga;
 
 /// Hard link user programs
 #[cfg(feature = "link_user")]

kernel/src/fs/vga.rs

@@ -0,0 +1,74 @@
+use rcore_fs::vfs::*;
+
+use alloc::{string::String, sync::Arc, vec::Vec};
+use core::any::Any;
+use crate::arch::board::fb::FRAME_BUFFER;
+
+#[derive(Default)]
+pub struct Vga;
+
+macro_rules! impl_inode {
+    () => {
+        fn set_metadata(&self, _metadata: &Metadata) -> Result<()> { Ok(()) }
+        fn sync_all(&self) -> Result<()> { Ok(()) }
+        fn sync_data(&self) -> Result<()> { Ok(()) }
+        fn resize(&self, _len: usize) -> Result<()> { Err(FsError::NotSupported) }
+        fn create(&self, _name: &str, _type_: FileType, _mode: u32) -> Result<Arc<INode>> { Err(FsError::NotDir) }
+        fn unlink(&self, _name: &str) -> Result<()> { Err(FsError::NotDir) }
+        fn link(&self, _name: &str, _other: &Arc<INode>) -> Result<()> { Err(FsError::NotDir) }
+        fn move_(&self, _old_name: &str, _target: &Arc<INode>, _new_name: &str) -> Result<()> { Err(FsError::NotDir) }
+        fn find(&self, _name: &str) -> Result<Arc<INode>> { Err(FsError::NotDir) }
+        fn get_entry(&self, _id: usize) -> Result<String> { Err(FsError::NotDir) }
+        fn io_control(&self, cmd: u32, data: usize) -> Result<()> { Err(FsError::NotSupported) }
+        fn fs(&self) -> Arc<FileSystem> { unimplemented!() }
+        fn as_any_ref(&self) -> &Any { self }
+    };
+}
+
+impl INode for Vga {
+    fn read_at(&self, offset: usize, buf: &mut [u8]) -> Result<usize> {
+        Err(FsError::NotSupported)
+    }
+    fn write_at(&self, _offset: usize, _buf: &[u8]) -> Result<usize> {
+        info!("the _offset is {} {}", _offset, _buf[0]);
+        let mut result : usize = 0;
+        if let Some(fb) = FRAME_BUFFER.lock().as_mut() {
+            for x in 0..1024 {  // TODO, should not use CONSTS
+                for y in 0..768 {
+                    let blue = _buf[3 * (x * 768 + y)];
+                    let green = _buf[3 * (x * 768 + y) + 1];
+                    let red = _buf[3 * (x * 768 + y) + 2];
+                    let pixel : u32 = ((blue as u32) << 16) | ((green as u32) << 8) | (red as u32);
+                    fb.write(x as u32, y as u32, pixel);
+                    result += 3;
+                }
+            }
+        }
+        return Ok(result);
+    }
+    fn poll(&self) -> Result<PollStatus> {
+        Ok(PollStatus { // TOKNOW and TODO
+            read: true,
+            write: false,
+            error: false,
+        })
+    }
+    fn metadata(&self) -> Result<Metadata> {
+        Ok(Metadata {
+            dev: 0,
+            inode: 0,
+            size: 0x24000,
+            blk_size: 0,
+            blocks: 0,
+            atime: Timespec { sec: 0, nsec: 0 },
+            mtime: Timespec { sec: 0, nsec: 0 },
+            ctime: Timespec { sec: 0, nsec: 0 },
+            type_: FileType::SymLink,
+            mode: 0,
+            nlinks: 0,
+            uid: 0,
+            gid: 0,
+        })
+    }
+    impl_inode!();
+}

kernel/src/syscall/fs.rs

@@ -871,7 +871,11 @@ impl Process {
         match path {
             "/proc/self/exe" => {
                 return Ok(Arc::new(Pseudo::new(&self.exec_path, FileType::SymLink)));
-            }
+            },
+            "/dev/fb0" => {
+                info!("/dev/fb0 will be opened");
+                return Ok(Arc::new(Vga::default()));
+            },
             _ => {}
         }
         let (fd_dir_path, fd_name) = split_path(&path);