// SPDX-License-Identifier: GPL-2.0-or-later /* * OpenRISC cache.c * * Linux architectural port borrowing liberally from similar works of * others. All original copyrights apply as per the original source * declaration. * * Modifications for the OpenRISC architecture: * Copyright (C) 2015 Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de> */ #include <asm/spr.h> #include <asm/spr_defs.h> #include <asm/cache.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> static __always_inline void cache_loop(struct page *page, const unsigned int reg) { unsigned long paddr = page_to_pfn(page) << PAGE_SHIFT; unsigned long line = paddr & ~(L1_CACHE_BYTES - 1); while (line < paddr + PAGE_SIZE) { mtspr(reg, line); line += L1_CACHE_BYTES; } } void local_dcache_page_flush(struct page *page) { cache_loop(page, SPR_DCBFR); } EXPORT_SYMBOL(local_dcache_page_flush); void local_icache_page_inv(struct page *page) { cache_loop(page, SPR_ICBIR); } EXPORT_SYMBOL(local_icache_page_inv); void update_cache(struct vm_area_struct *vma, unsigned long address, pte_t *pte) { unsigned long pfn = pte_val(*pte) >> PAGE_SHIFT; struct page *page = pfn_to_page(pfn); int dirty = !test_and_set_bit(PG_dc_clean, &page->flags); /* * Since icaches do not snoop for updated data on OpenRISC, we * must write back and invalidate any dirty pages manually. We * can skip data pages, since they will not end up in icaches. */ if ((vma->vm_flags & VM_EXEC) && dirty) sync_icache_dcache(page); }