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, 47 insertions, 0 deletions

diff --git a/lume-legacy/src/boot/entry.S b/lume-legacy/src/boot/entry.S
new file mode 100644
index 0000000..8910ddc
--- /dev/null
+++ b/lume-legacy/src/boot/entry.S
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2026 Richard Qin
+
+.section .text.entry
+.global _start
+
+_start:
+    mv tp, a0
+
+    la t0, stack_base
+    li t1, 4096
+    addi t2, a0, 1
+    mul t1, t1, t2
+    add sp, t0, t1
+
+    bnez a0, .L_jump_main
+
+    la t0, sbss
+    la t1, ebss
+.L_clear_bss:
+    bge t0, t1, .L_save_dtb
+    sd zero, 0(t0)
+    addi t0, t0, 8
+    j .L_clear_bss
+
+.L_save_dtb:
+    la t0, g_dtb_addr
+    sd a1, 0(t0)
+
+.L_jump_main:
+    call kernel_main
+
+.L_park:
+    wfi
+    j .L_park
+
+.section .bss
+.align 4
+.global stack_top
+stack_base:
+    .space 4096 * 8
+stack_top:
+
+.align 8
+.global g_dtb_addr
+g_dtb_addr:
+    .space 8
\ No newline at end of file