linux_kernel/arch/riscv/include/asm/cacheflush.h

/*
 * Copyright (C) 2015 Regents of the University of California
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program 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 General Public License for more details.
 */

#ifndef _ASM_RISCV_CACHEFLUSH_H
#define _ASM_RISCV_CACHEFLUSH_H

#include <asm-generic/cacheflush.h>

#undef flush_icache_range
#undef flush_icache_user_range
#undef flush_dcache_page

static inline void local_flush_icache_all(void)
{
	asm volatile ("fence.i" ::: "memory");
}

#define PG_dcache_clean PG_arch_1

static inline void flush_dcache_page(struct page *page)
{
	if (test_bit(PG_dcache_clean, &page->flags))
		clear_bit(PG_dcache_clean, &page->flags);
}

/*
 * RISC-V doesn't have an instruction to flush parts of the instruction cache,
 * so instead we just flush the whole thing.
 */
#define flush_icache_range(start, end) flush_icache_all()
#define flush_icache_user_range(vma, pg, addr, len) flush_icache_all()

#ifndef CONFIG_SMP

#define flush_icache_all() local_flush_icache_all()
#define flush_icache_mm(mm, local) flush_icache_all()

#else /* CONFIG_SMP */

#define flush_icache_all() sbi_remote_fence_i(0)
void flush_icache_mm(struct mm_struct *mm, bool local);

#endif /* CONFIG_SMP */

#endif /* _ASM_RISCV_CACHEFLUSH_H */