linux_kernel/arch/csky/abiv1/cacheflush.c

// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/syscalls.h>
#include <linux/spinlock.h>
#include <asm/page.h>
#include <asm/cache.h>
#include <asm/cacheflush.h>
#include <asm/cachectl.h>

void flush_dcache_page(struct page *page)
{
	struct address_space *mapping = page_mapping(page);
	unsigned long addr;

	if (mapping && !mapping_mapped(mapping)) {
		set_bit(PG_arch_1, &(page)->flags);
		return;
	}

	/*
	 * We could delay the flush for the !page_mapping case too.  But that
	 * case is for exec env/arg pages and those are %99 certainly going to
	 * get faulted into the tlb (and thus flushed) anyways.
	 */
	addr = (unsigned long) page_address(page);
	dcache_wb_range(addr, addr + PAGE_SIZE);
}

void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
		      pte_t *pte)
{
	unsigned long addr;
	struct page *page;
	unsigned long pfn;

	pfn = pte_pfn(*pte);
	if (unlikely(!pfn_valid(pfn)))
		return;

	page = pfn_to_page(pfn);
	addr = (unsigned long) page_address(page);

	if (vma->vm_flags & VM_EXEC ||
	    pages_do_alias(addr, address & PAGE_MASK))
		cache_wbinv_all();

	clear_bit(PG_arch_1, &(page)->flags);
}