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, 0 insertions, 55 deletions

diff --git a/na/arch/riscv/include/asm/pgtable.h b/na/arch/riscv/include/asm/pgtable.h
deleted file mode 100644
index 28fc4c5..0000000
--- a/na/arch/riscv/include/asm/pgtable.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/* Copyright (C) 2026 Richard Qin */
-
-#ifndef _ASM_RISCV_PGTABLE_H
-#define _ASM_RISCV_PGTABLE_H
-
-/*
- * Early page-table construction API used by arch/riscv/mm/init.cc::setup_vm.
- *
- * Mirrors the create_pgd_mapping interface from Linux's
- * arch/riscv/mm/init.c — same name, same semantics:
- *
- *   create_pgd_mapping(pgdir, va, pa, sz, prot)
- *
- *     pgdir : root of the page table to populate
- *     va    : virtual address to map
- *     pa    : physical address to map to
- *     sz    : mapping size — must be a supported leaf size (PAGE_SIZE,
- *             2 MiB megapage, or 1 GiB gigapage)
- *     prot  : PTE flag bits (PAGE_KERNEL_EXEC etc., from <asm/page.h>)
- *
- * The boot-time variant in this file only supports gigapage (1 GiB)
- * mappings — that is all setup_vm needs for the early_pg_dir / trampoline_pg_dir
- * built before the slab allocator exists.  Finer-grained mappings come
- * later via vmm_init().
- */
-
-#include <lume/types.h>
-#include <asm/page.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef struct { unsigned long pgd; } pgd_t;
-
-/* Linker-provided early page-table storage (defined in lumeos.lds.S
- * ARCH_BSS_EXTRA, lives in .bss so it's zero-initialized).  Allocating
- * them in the linker script — not in C — mirrors Linux and keeps the
- * symbols visible from head.S without a forward C decl mismatch. */
-extern pgd_t early_pg_dir[PTRS_PER_PGD];
-extern pgd_t trampoline_pg_dir[PTRS_PER_PGD];
-extern pgd_t fixmap_pg_dir[PTRS_PER_PGD];
-
-/* Install a single PGD entry mapping `va` → `pa` with size `sz` and PTE
- * flags `prot`.  Only sz == PGDIR_SIZE (1 GiB) is supported in this early
- * variant — vmm_init() takes over with create_pgd_mapping_pmd later. */
-void create_pgd_mapping(pgd_t *pgdir, unsigned long va, unsigned long pa,
-                        unsigned long sz, unsigned long prot);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _ASM_RISCV_PGTABLE_H */