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