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, 79 insertions, 0 deletions

diff --git a/lume-legacy/src/kernel/main.cc b/lume-legacy/src/kernel/main.cc
new file mode 100644
index 0000000..6a19915
--- /dev/null
+++ b/lume-legacy/src/kernel/main.cc
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2026 Richard QIn
+ */
+#include "common/types.h"
+#include "kernel/riscv.h"
+#include "drivers/uart.h"
+#include "drivers/plic.h"
+#include "drivers/virtio.h"
+#include "kernel/pmm.h"
+#include "kernel/mm.h"
+#include "kernel/slab.h"
+#include "kernel/proc.h"
+#include "kernel/trap.h"
+#include "kernel/timer.h"
+#include "kernel/cpu.h"
+#include "kernel/buf.h"
+#include "fs/fs.h"
+#include "fs/file.h"
+#include "fs/fat32.h"
+#include "lib/string.h"
+
+#include "kernel/fdt.h" // fdt_parse
+
+extern uint64 g_dtb_addr;
+
+// Placement new support (referenced from cxx.cc)
+void *operator new(unsigned long size, void *ptr);
+
+volatile static int started = 0;
+
+extern "C" void kernel_main(uint64 hartid, uint64 dtb)
+{
+    if (hartid == 0)
+    {
+        fdt_parse(dtb);
+
+        Drivers::uart_init();
+        Drivers::uart_puts("\n[Lume OS] Booting...\n");
+
+        Drivers::uart_puts("[Boot] PMP configured.\n");
+
+        PMM::init();              // Physical Memory Management
+        VM::kvminit();            // Kernel Pagetable
+        VM::kvminithart();        // Enable MMU
+        Slab::init();
+        Trap::init();             // Trap Management
+        Trap::inithart();
+        PLIC::init();
+        PLIC::inithart();
+        VirtIO::init();
+        BufferCache::init();
+        VFS::init();
+        // Initialize global FAT32 object manually (global constructors not supported yet)
+        new (&fat32_fs) FAT32FileSystem();
+        VFS::register_fs(&fat32_fs);
+        FileTable::init();
+        Timer::init();
+        ProcManager::init();      // Process Management
+        ProcManager::user_init(); // Initialize first user process
+
+        __atomic_store_n(&started, 1, __ATOMIC_RELEASE);
+
+        Drivers::uart_puts("[Boot] System initialized. Entering scheduler...\n");
+    }
+    else
+    {
+        while (__atomic_load_n(&started, __ATOMIC_ACQUIRE) == 0)
+            ;
+
+        VM::kvminithart();
+        Trap::inithart();
+        PLIC::inithart();
+        Timer::init();
+        Drivers::uart_puts("[Boot] Hart started.\n");
+    }
+
+    ProcManager::scheduler(); // Enable Scheduler
+}
\ No newline at end of file