Better virtual file system, keyboard through MMIO&VirtIO

Cargo.toml

@@ -1,6 +1,6 @@
 [workspace]
 resolver = "3"
-members = ["crates/os-std", "crates/shared", "user/*"]
+members = ["crates/io","crates/os-std", "crates/shared", "user/*"]
 
 [package]
 name = "kernel-rust"
@@ -13,6 +13,7 @@ kernel-macros = { path = "crates/kernel-macros" }
 log = "0.4"
 critical-section = { version = "1", features = ["restore-state-bool"] }
 bffs = { path = "crates/bffs", features = ["alloc"] }
+io = { path = "crates/io", features = ["alloc"] }
 shared = { path = "crates/shared", features = ["kernel"] }
 # ELF parsing helper
 goblin = { version = "0.7", default-features = false, features = ["elf32", "elf64", "endian_fd"] }