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/* RISC-V instruction cache flushing VDSO calls
Copyright (C) 2017-2020 Free Software Foundation, Inc.
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
<https://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <atomic.h>
#include <sys/syscall.h>
#ifndef __NR_riscv_flush_icache
#define __NR_riscv_flush_icache 259
#endif
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)
{
/* always call the system call directly.*/
return &__riscv_flush_icache_syscall;
}
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);
}
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