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57 lines
1.5 KiB
57 lines
1.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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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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