Add the keyboard mode flags

Cargo.lock

@@ -122,6 +122,7 @@ dependencies = [
 name = "aster-console"
 version = "0.1.0"
 dependencies = [
+ "bitflags 1.3.2",
  "component",
  "font8x8",
  "int-to-c-enum",

kernel/comps/console/Cargo.toml

@@ -6,6 +6,7 @@ edition.workspace = true
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+bitflags.workspace = true
 component.workspace = true
 font8x8.workspace = true
 int-to-c-enum.workspace = true

kernel/comps/console/src/mode.rs

@@ -37,3 +37,25 @@ pub enum KeyboardMode {
     /// The off mode (`K_OFF` in Linux).
     Off = 4,
 }
+
+bitflags::bitflags! {
+    /// The keyboard mode flags.
+    ///
+    // Reference: <https://elixir.bootlin.com/linux/v6.17.4/source/include/linux/kbd_kern.h#L53-L58>.
+    pub struct KeyboardModeFlags: u8 {
+        /// The application key mode (`VC_APPLIC` in Linux).
+        const APPLICATION = 1 << 0;
+        /// The cursor key mode (`VC_CKMODE` in Linux).
+        const CURSOR_KEY = 1 << 1;
+        /// The repeat mode (`VC_REPEAT` in Linux).
+        const REPEAT = 1 << 2;
+        /// The CRLF mode (`VC_CRLF` in Linux).
+        ///
+        /// If set, enter key sends `\r\n`; otherwise, it sends `\r` only.
+        const CRLF   = 1 << 3;
+        /// The meta key mode (`VC_META` in Linux).
+        ///
+        /// If set, every input character has a prefix with `ESC` (0x1B).
+        const META   = 1 << 4;
+    }
+}