1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/console.cc b/drivers/console.cc
new file mode 100644
index 0000000..f741dd2
--- /dev/null
+++ b/drivers/console.cc
@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2026 Richard Qin */
+
+/*
+ * console.cc — Console character device (/dev/console)
+ *
+ * Wraps the existing early_putc() UART driver as a file_operations
+ * chardev.  read() is a stub for now (returns 0 = EOF).
+ * write() sends each byte through early_putc().
+ */
+
+#include <lume/file.h>
+#include <lume/chardev.h>
+#include <lume/types.h>
+
+extern "C" void early_putc(char c);
+
+/* ================================================================== */
+/*  console_write                                                     */
+/* ================================================================== */
+
+static int64 console_write(file* fp, const char* buf, uint64 count, int64* pos)
+{
+    (void)fp;
+    (void)pos;
+
+    for (uint64 i = 0; i < count; i++) {
+        early_putc(buf[i]);
+    }
+
+    return static_cast<int64>(count);
+}
+
+/* ================================================================== */
+/*  console_read — stub (returns 0 = EOF for now)                     */
+/* ================================================================== */
+
+static int64 console_read(file* fp, char* buf, uint64 count, int64* pos)
+{
+    (void)fp;
+    (void)buf;
+    (void)count;
+    (void)pos;
+    /* TODO: implement UART RX polling/IRQ-based blocking read */
+    return 0;
+}
+
+/* ================================================================== */
+/*  null device — /dev/null                                           */
+/* ================================================================== */
+
+static int64 null_read(file* /*fp*/, char* /*buf*/, uint64 /*count*/, int64* /*pos*/)
+{
+    return 0;  /* EOF */
+}
+
+static int64 null_write(file* /*fp*/, const char* /*buf*/, uint64 count, int64* /*pos*/)
+{
+    return static_cast<int64>(count);  /* discard */
+}
+
+/* ================================================================== */
+/*  zero device — /dev/zero                                           */
+/* ================================================================== */
+
+static int64 zero_read(file* /*fp*/, char* buf, uint64 count, int64* /*pos*/)
+{
+    for (uint64 i = 0; i < count; i++) {
+        buf[i] = 0;
+    }
+    return static_cast<int64>(count);
+}
+
+static int64 zero_write(file* /*fp*/, const char* /*buf*/, uint64 count, int64* /*pos*/)
+{
+    return static_cast<int64>(count);  /* discard */
+}
+
+/* ================================================================== */
+/*  Registration — runtime init (no static initializers!)             */
+/* ================================================================== */
+
+static file_operations console_fops;
+static file_operations null_fops;
+static file_operations zero_fops;
+
+static cdev console_cdev;
+static cdev null_cdev;
+static cdev zero_cdev;
+
+void console_cdev_init()
+{
+    /* Console: major=5, minor=1 */
+    console_fops.read  = console_read;
+    console_fops.write = console_write;
+
+    console_cdev.name = "console";
+    console_cdev.dev  = MKDEV(5, 1);
+    console_cdev.fops = &console_fops;
+    cdev_register(&console_cdev);
+
+    /* /dev/null: major=1, minor=3 */
+    null_fops.read  = null_read;
+    null_fops.write = null_write;
+
+    null_cdev.name = "null";
+    null_cdev.dev  = MKDEV(1, 3);
+    null_cdev.fops = &null_fops;
+    cdev_register(&null_cdev);
+
+    /* /dev/zero: major=1, minor=5 */
+    zero_fops.read  = zero_read;
+    zero_fops.write = zero_write;
+
+    zero_cdev.name = "zero";
+    zero_cdev.dev  = MKDEV(1, 5);
+    zero_cdev.fops = &zero_fops;
+    cdev_register(&zero_cdev);
+}