mirror of https://gitee.com/openkylin/linux.git
140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/* MN10300 Cache flushing routines
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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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 Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/threads.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/cacheflush.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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EXPORT_SYMBOL(mn10300_icache_inv);
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EXPORT_SYMBOL(mn10300_dcache_inv);
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EXPORT_SYMBOL(mn10300_dcache_inv_range);
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EXPORT_SYMBOL(mn10300_dcache_inv_range2);
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EXPORT_SYMBOL(mn10300_dcache_inv_page);
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#ifdef CONFIG_MN10300_CACHE_WBACK
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EXPORT_SYMBOL(mn10300_dcache_flush);
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EXPORT_SYMBOL(mn10300_dcache_flush_inv);
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EXPORT_SYMBOL(mn10300_dcache_flush_inv_range);
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EXPORT_SYMBOL(mn10300_dcache_flush_inv_range2);
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EXPORT_SYMBOL(mn10300_dcache_flush_inv_page);
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EXPORT_SYMBOL(mn10300_dcache_flush_range);
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EXPORT_SYMBOL(mn10300_dcache_flush_range2);
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EXPORT_SYMBOL(mn10300_dcache_flush_page);
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#endif
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/*
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* write a page back from the dcache and invalidate the icache so that we can
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* run code from it that we've just written into it
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*/
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void flush_icache_page(struct vm_area_struct *vma, struct page *page)
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{
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mn10300_dcache_flush_page(page_to_phys(page));
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mn10300_icache_inv();
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}
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EXPORT_SYMBOL(flush_icache_page);
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/*
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* write some code we've just written back from the dcache and invalidate the
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* icache so that we can run that code
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*/
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void flush_icache_range(unsigned long start, unsigned long end)
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{
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#ifdef CONFIG_MN10300_CACHE_WBACK
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unsigned long addr, size, base, off;
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struct page *page;
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *ppte, pte;
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if (end > 0x80000000UL) {
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/* addresses above 0xa0000000 do not go through the cache */
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if (end > 0xa0000000UL) {
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end = 0xa0000000UL;
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if (start >= end)
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return;
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}
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/* kernel addresses between 0x80000000 and 0x9fffffff do not
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* require page tables, so we just map such addresses directly */
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base = (start >= 0x80000000UL) ? start : 0x80000000UL;
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mn10300_dcache_flush_range(base, end);
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if (base == start)
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goto invalidate;
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end = base;
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}
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for (; start < end; start += size) {
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/* work out how much of the page to flush */
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off = start & (PAGE_SIZE - 1);
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size = end - start;
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if (size > PAGE_SIZE - off)
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size = PAGE_SIZE - off;
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/* get the physical address the page is mapped to from the page
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* tables */
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pgd = pgd_offset(current->mm, start);
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if (!pgd || !pgd_val(*pgd))
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continue;
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pud = pud_offset(pgd, start);
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if (!pud || !pud_val(*pud))
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continue;
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pmd = pmd_offset(pud, start);
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if (!pmd || !pmd_val(*pmd))
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continue;
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ppte = pte_offset_map(pmd, start);
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if (!ppte)
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continue;
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pte = *ppte;
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pte_unmap(ppte);
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if (pte_none(pte))
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continue;
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page = pte_page(pte);
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if (!page)
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continue;
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addr = page_to_phys(page);
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/* flush the dcache and invalidate the icache coverage on that
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* region */
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mn10300_dcache_flush_range2(addr + off, size);
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}
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#endif
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invalidate:
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mn10300_icache_inv();
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}
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EXPORT_SYMBOL(flush_icache_range);
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/*
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* allow userspace to flush the instruction cache
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*/
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asmlinkage long sys_cacheflush(unsigned long start, unsigned long end)
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{
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if (end < start)
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return -EINVAL;
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flush_icache_range(start, end);
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return 0;
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}
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