refactor: promote new architecture to repository root

Archive the deprecated implementation under lume-legacy, make the new kernel the default root-level build, and update repository entry points without changing kernel behavior.

1 files changed, 38 insertions, 0 deletions

diff --git a/lume-legacy/include/drivers/uart.h b/lume-legacy/include/drivers/uart.h
new file mode 100644
index 0000000..a56624c
--- /dev/null
+++ b/lume-legacy/include/drivers/uart.h
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard Qin
+ */
+
+#pragma once
+#include "common/types.h"
+#include "drivers/uart_color.h"
+#include "kernel/fdt.h"
+
+// UART register offsets (NS16550A)
+#define RHR 0 // Receive Holding Register (read mode)
+#define THR 0 // Transmit Holding Register (write mode)
+#define IER 1 // Interrupt Enable Register
+#define FCR 2 // FIFO Control Register
+#define ISR 2 // Interrupt Status Register
+#define LCR 3 // Line Control Register
+#define LSR 5 // Line Status Register
+
+#define LSR_RX_READY 0x01 // input is waiting to be read from RHR
+#define LSR_TX_IDLE 0x20  // THR can accept another character to send
+
+#define UART_RX_BUF_SIZE 128
+
+// UART base address from FDT (use inline function to avoid macro issues)
+static inline uint64 uart_base() { return g_devices.uart.base_addr; }
+
+namespace Drivers
+{
+    void uart_init();
+    void uart_intr();
+    int console_read(uint64 target, int len);
+
+    void uart_putc(char c);
+    void uart_puts(const char *s);
+    void uart_put_int(int value);
+    void print_hex(uint64 value);
+}
\ No newline at end of file