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