arch/nios2/mm/cacheflush.c

Source file repositories/reference/linux-study-clean/arch/nios2/mm/cacheflush.c

File Facts

System
Linux kernel
Corpus path
arch/nios2/mm/cacheflush.c
Extension
.c
Size
7421 bytes
Lines
282
Domain
Architecture Layer
Bucket
arch/nios2
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (mapping) {
			unsigned long start = (unsigned long)folio_address(folio);
			flush_aliases(mapping, folio);
			flush_icache_range(start, start + folio_size(folio));
		}
		set_bit(PG_dcache_clean, &folio->flags.f);
	}
}
EXPORT_SYMBOL(flush_dcache_folio);

void flush_dcache_page(struct page *page)
{
	flush_dcache_folio(page_folio(page));
}
EXPORT_SYMBOL(flush_dcache_page);

void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
		unsigned long address, pte_t *ptep, unsigned int nr)
{
	pte_t pte = *ptep;
	unsigned long pfn = pte_pfn(pte);
	struct folio *folio;
	struct address_space *mapping;

	reload_tlb_page(vma, address, pte);

	if (!pfn_valid(pfn))
		return;

	/*
	* The zero page is never written to, so never has any dirty
	* cache lines, and therefore never needs to be flushed.
	*/
	if (is_zero_pfn(pfn))
		return;

	folio = page_folio(pfn_to_page(pfn));
	if (!test_and_set_bit(PG_dcache_clean, &folio->flags.f))
		__flush_dcache_folio(folio);

	mapping = folio_flush_mapping(folio);
	if (mapping) {
		flush_aliases(mapping, folio);
		if (vma->vm_flags & VM_EXEC)
			flush_icache_pages(vma, &folio->page,
					folio_nr_pages(folio));
	}
}

void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
		    struct page *to)
{
	__flush_dcache(vaddr, vaddr + PAGE_SIZE);
	__flush_icache(vaddr, vaddr + PAGE_SIZE);
	copy_page(vto, vfrom);
	__flush_dcache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
	__flush_icache((unsigned long)vto, (unsigned long)vto + PAGE_SIZE);
}

void clear_user_page(void *addr, unsigned long vaddr, struct page *page)
{
	__flush_dcache(vaddr, vaddr + PAGE_SIZE);
	__flush_icache(vaddr, vaddr + PAGE_SIZE);
	clear_page(addr);
	__flush_dcache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
	__flush_icache((unsigned long)addr, (unsigned long)addr + PAGE_SIZE);
}

void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
			unsigned long user_vaddr,
			void *dst, void *src, int len)
{
	flush_cache_page(vma, user_vaddr, page_to_pfn(page));
	memcpy(dst, src, len);
	__flush_dcache((unsigned long)src, (unsigned long)src + len);
	if (vma->vm_flags & VM_EXEC)
		__flush_icache((unsigned long)src, (unsigned long)src + len);
}

void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
			unsigned long user_vaddr,
			void *dst, void *src, int len)
{
	flush_cache_page(vma, user_vaddr, page_to_pfn(page));
	memcpy(dst, src, len);
	__flush_dcache((unsigned long)dst, (unsigned long)dst + len);
	if (vma->vm_flags & VM_EXEC)
		__flush_icache((unsigned long)dst, (unsigned long)dst + len);
}

Annotation

Implementation Notes