feat: establish bootable new architecture checkpoint

Replace the compressed boot path with a relocatable higher-half RISC-V entry, expand memory and SMP support, and add the driver, TTY, VFS, exec, signal, syscall, initramfs, and self-test infrastructure needed for a bootable kernel checkpoint.

1 files changed, 95 insertions, 0 deletions

diff --git a/na/fs/super.cc b/na/fs/super.cc
new file mode 100644
index 0000000..231b57c
--- /dev/null
+++ b/na/fs/super.cc
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2026 Richard Qin */
+
+/*
+ * super.cc — Superblock lifecycle + filesystem type registry
+ */
+
+#include <lume/fs.h>
+#include <lume/dcache.h>
+#include <lume/mount.h>
+#include <lume/klog.h>
+#include <lume/slab.h>
+#include <lume/errno.h>
+
+/* Global root filesystem entry points */
+vfsmount* g_root_mnt    = nullptr;
+dentry*   g_root_dentry = nullptr;
+
+/* ================================================================== */
+/*  Filesystem type registry                                          */
+/* ================================================================== */
+
+namespace {
+
+list_head g_fs_types;
+Spinlock  g_fs_type_lock;
+
+} // namespace
+
+int register_filesystem(file_system_type* fs)
+{
+    LockGuard guard(g_fs_type_lock);
+    list_add_tail(&fs->fs_list, &g_fs_types);
+    printk("[vfs] registered filesystem: %s\n", fs->name);
+    return 0;
+}
+
+file_system_type* get_fs_type(const char* name)
+{
+    LockGuard guard(g_fs_type_lock);
+    list_node* pos;
+    list_for_each(pos, &g_fs_types) {
+        auto* fs = list_entry(pos, file_system_type, fs_list);
+        /* Simple strcmp */
+        const char* a = fs->name;
+        const char* b = name;
+        while (*a && *a == *b) { a++; b++; }
+        if (*a == '\0' && *b == '\0')
+            return fs;
+    }
+    return nullptr;
+}
+
+/* ================================================================== */
+/*  Superblock allocation                                             */
+/* ================================================================== */
+
+super_block* alloc_super(file_system_type* type)
+{
+    auto* sb = new super_block{};
+    if (!sb) return nullptr;
+
+    list_init(&sb->s_list);
+    list_init(&sb->s_inodes);
+    sb->s_type = type;
+    sb->s_op = nullptr;
+    sb->s_root = nullptr;
+    sb->s_fs_info = nullptr;
+    sb->s_blocksize = 4096;
+    sb->s_blocksize_bits = 12;
+    sb->s_maxbytes = 0x7FFFFFFFFFFFFFFFLL;
+    sb->s_time_gran = 1;
+    sb->s_time_min = 0;
+    sb->s_time_max = 0x7FFFFFFFFFFFFFFFLL;
+    sb->s_flags = 0;
+    sb->s_magic = 0;
+    sb->s_active.store(1);
+    sb->s_count = 1;
+    sb->s_max_links = 0;
+    sb->s_d_op = nullptr;
+    sb->s_mounts = nullptr;
+    sb->s_dev = 0;
+    for (int i = 0; i < 32; i++) sb->s_id[i] = 0;
+
+    return sb;
+}
+
+/* ================================================================== */
+/*  Init                                                              */
+/* ================================================================== */
+
+void super_init()
+{
+    list_init(&g_fs_types);
+}