1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OpenRISC cache.c
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others.  All original copyrights apply as per the original source
7 * declaration.
8 *
9 * Modifications for the OpenRISC architecture:
10 * Copyright (C) 2015 Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de>
11 */
12
13#include <asm/spr.h>
14#include <asm/spr_defs.h>
15#include <asm/cache.h>
16#include <asm/cacheflush.h>
17#include <asm/tlbflush.h>
18
19static __always_inline void cache_loop(struct page *page, const unsigned int reg)
20{
21	unsigned long paddr = page_to_pfn(page) << PAGE_SHIFT;
22	unsigned long line = paddr & ~(L1_CACHE_BYTES - 1);
23
24	while (line < paddr + PAGE_SIZE) {
25		mtspr(reg, line);
26		line += L1_CACHE_BYTES;
27	}
28}
29
30void local_dcache_page_flush(struct page *page)
31{
32	cache_loop(page, SPR_DCBFR);
33}
34EXPORT_SYMBOL(local_dcache_page_flush);
35
36void local_icache_page_inv(struct page *page)
37{
38	cache_loop(page, SPR_ICBIR);
39}
40EXPORT_SYMBOL(local_icache_page_inv);
41
42void update_cache(struct vm_area_struct *vma, unsigned long address,
43	pte_t *pte)
44{
45	unsigned long pfn = pte_val(*pte) >> PAGE_SHIFT;
46	struct folio *folio = page_folio(pfn_to_page(pfn));
47	int dirty = !test_and_set_bit(PG_dc_clean, &folio->flags);
48
49	/*
50	 * Since icaches do not snoop for updated data on OpenRISC, we
51	 * must write back and invalidate any dirty pages manually. We
52	 * can skip data pages, since they will not end up in icaches.
53	 */
54	if ((vma->vm_flags & VM_EXEC) && dirty) {
55		unsigned int nr = folio_nr_pages(folio);
56
57		while (nr--)
58			sync_icache_dcache(folio_page(folio, nr));
59	}
60}
61
62