vfs: everything is a file — dirs, ramfs, character devices

- fs.rs: node-table VFS (root /dev /tmp /etc).  Regular files are
  in-memory ramfs; char devices regenerate content on every read so
  'cat /dev/rtc' shows the live time.  Nodes are stable handles with
  tombstone removal; . and .. path resolution.
- /dev devices: mem (raw physical RAM, offset = address), rtc, pci,
  version, meminfo, null, zero, console (write prints to screen+serial),
  serial.  /etc/motd static file.
- shell: ls, cat, hexdump (hexdump -C style), mkdir, touch, rm; echo
  gains '>' overwrite and '>>' append redirection (append bug fixed:
  first '>' in '>>' was parsed as overwrite)
- boot: fs init + self-test (create/read/write/remove) before the shell
- QEMU verified: file lifecycle, redirection, console/null writes,
  mkdir/touch/rm, hexdump /dev/mem and /tmp/x byte-exact

1 files changed, 8 insertions, 0 deletions

diff --git a/rsdos/src/main.rs b/rsdos/src/main.rs
index c35d88f..8e49937 100644
--- a/rsdos/src/main.rs
+++ b/rsdos/src/main.rs
@@ -154,6 +154,14 @@ pub extern "efiapi" fn efi_main(image_handle: Handle, system_table: *mut SystemT
     let devices = rsnix::pci::probe();
     rsnix::serial_println!("pci: {} device(s) on all buses", devices.len());
 
+    let (dirs, files) = rsnix::fs::init();
+    rsnix::serial_println!("fs: vfs ready — {} dirs, {} files", dirs, files);
+    if rsnix::fs::self_test() {
+        rsnix::serial_println!("fs: self-test OK (create/read/write/remove)");
+    } else {
+        rsnix::serial_println!("fs: self-test FAILED");
+    }
+
     rsnix::serial_println!("boot: entering shell");
     shell::run();
 }