/* RISC-V instruction cache flushing VDSO calls

   Copyright (C) 2017-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public License as

   published by the Free Software Foundation; either version 2.1 of the

   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <dl-vdso.h>

#include <stdlib.h>

#include <atomic.h>

#include <sys/cachectl.h>

#include <asm/syscalls.h>

typedef int (*func_type) (void *, void *, unsigned long int);

static int

__riscv_flush_icache_syscall (void *start, void *end, unsigned long int flags)

{

  return INLINE_SYSCALL (riscv_flush_icache, 3, start, end, flags);

}

static func_type

__lookup_riscv_flush_icache (void)

{

  PREPARE_VERSION_KNOWN (linux_version, LINUX_4_15);

  func_type func = _dl_vdso_vsym ("__vdso_flush_icache", &linux_version);

  /* If there is no vDSO entry then call the system call directly.  All Linux

     versions provide the vDSO entry, but QEMU's user-mode emulation doesn't

     provide a vDSO.  */

  if (!func)

    func = &__riscv_flush_icache_syscall;

  return func;

}

#ifdef SHARED

# define INIT_ARCH()

libc_ifunc (__riscv_flush_icache, __lookup_riscv_flush_icache ())

#else

int

__riscv_flush_icache (void *start, void *end, unsigned long int flags)

{

  static volatile func_type cached_func;

  func_type func = atomic_load_relaxed (&cached_func);

  if (!func)

    {

      func = __lookup_riscv_flush_icache ();

      atomic_store_relaxed (&cached_func, func);

    }

  return func (start, end, flags);

}

#endif