diff --git a/src/lib/dde_rump_backport/riscv/include/cpu.h b/src/lib/dde_rump_backport/riscv/include/cpu.h
deleted file mode 100644
index 2b6f036..0000000
--- src/lib/dde_rump_backport/riscv/include/cpu.h
+++ /dev/null
@@ -1,151 +0,0 @@
-/* $NetBSD: cpu.h,v 1.4 2015/04/01 21:55:03 matt Exp $ */
-
-/*-
- * Copyright (c) 2014 The NetBSD Foundation, Inc.
- * All rights reserved.
- *
- * This code is derived from software contributed to The NetBSD Foundation
- * by Matt Thomas of 3am Software Foundry.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
- * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef _RISCV_CPU_H_
-#define _RISCV_CPU_H_
-
-#if defined(_KERNEL) || defined(_KMEMUSER)
-
-struct clockframe {
-	uintptr_t cf_pc;
-	uint32_t cf_sr;
-	int cf_intr_depth;
-};
-
-#define CLKF_USERMODE(cf)	(((cf)->cf_sr & 1) == 0)
-#define CLKF_PC(cf)		((cf)->cf_pc)
-#define CLKF_INTR(cf)		((cf)->cf_intr_depth > 0)
-
-#include <sys/cpu_data.h>
-#include <sys/device_if.h>
-#include <sys/evcnt.h>
-#include <sys/intr.h>
-
-struct cpu_info {
-	struct cpu_data ci_data;
-	device_t ci_dev;
-	cpuid_t ci_cpuid;
-	struct lwp *ci_curlwp;
-	struct lwp *ci_softlwps[SOFTINT_COUNT];
-	struct trapframe *ci_ddb_regs;
-
-	uint64_t ci_lastintr;
-
-	int ci_mtx_oldspl;
-	int ci_mtx_count;
-
-	int ci_want_resched;
-	int ci_cpl;
-	u_int ci_softints;
-	volatile u_int ci_intr_depth;
-
-	tlb_asid_t ci_pmap_asid_cur;
-#if 0
-	union pmap_pdetab *ci_pmap_user_pdetab;
-#ifdef _LP64
-	union pmap_pdetab *ci_pmap_user_pde0tab;
-#endif
-#endif
-
-	struct evcnt ci_ev_fpu_saves;
-	struct evcnt ci_ev_fpu_loads;
-	struct evcnt ci_ev_fpu_reenables;
-};
-
-#endif /* _KERNEL || _KMEMUSER */
-
-#ifdef _KERNEL
-
-extern struct cpu_info cpu_info_store;
-
-// This is also in <sys/lwp.h>
-struct lwp;
-static inline struct cpu_info *lwp_getcpu(struct lwp *);
-
-register struct lwp *riscv_curlwp __asm("tp");
-#define	curlwp		riscv_curlwp
-#define	curcpu()	lwp_getcpu(curlwp)
-
-static inline cpuid_t
-cpu_number(void)
-{
-#ifdef MULTIPROCESSOR
-	return curcpu()->ci_cpuid;
-#else
-	return 0;
-#endif
-}
-
-void	cpu_set_curpri(int);
-void	cpu_proc_fork(struct proc *, struct proc *);
-void	cpu_signotify(struct lwp *);
-void	cpu_need_proftick(struct lwp *l);
-void	cpu_boot_secondary_processors(void);
-
-#define CPU_INFO_ITERATOR	cpuid_t
-#ifdef MULTIPROCESSOR
-#define CPU_INFO_FOREACH(cii, ci) \
-	(cii) = 0; ((ci) = cpu_infos[cii]) != NULL; (cii)++
-#else
-#define CPU_INFO_FOREACH(cii, ci) \
-	(cii) = 0, (ci) = curcpu(); (cii) == 0; (cii)++
-#endif
-
-#define CPU_INFO_CURPMAP(ci)	(curlwp->l_proc->p_vmspace->vm_map.pmap)
-
-static inline void
-cpu_dosoftints(void)
-{
-	extern void dosoftints(void);
-        struct cpu_info * const ci = curcpu();
-        if (ci->ci_intr_depth == 0
-	    && (ci->ci_data.cpu_softints >> ci->ci_cpl) > 0)
-                dosoftints();
-}
-
-static inline bool
-cpu_intr_p(void)
-{
-	return curcpu()->ci_intr_depth > 0;
-}
-
-#define LWP_PC(l)	cpu_lwp_pc(l)
-
-vaddr_t	cpu_lwp_pc(struct lwp *);
-
-static inline void
-cpu_idle(void)
-{
-}
-
-#endif /* _KERNEL */
-
-#endif /* _RISCV_CPU_H_ */