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 19 static __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 30 void local_dcache_page_flush(struct page *page) 31 { 32 cache_loop(page, SPR_DCBFR); 33 } 34 EXPORT_SYMBOL(local_dcache_page_flush); 35 36 void local_icache_page_inv(struct page *page) 37 { 38 cache_loop(page, SPR_ICBIR); 39 } 40 EXPORT_SYMBOL(local_icache_page_inv); 41 42 void 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