72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
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/* cache-page.c: whole-page cache wrangling functions for MMU linux
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*
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* Copyright (C) 2004 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 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 <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/highmem.h>
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#include <linux/module.h>
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#include <asm/pgalloc.h>
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/*****************************************************************************/
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/*
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* DCF takes a virtual address and the page may not currently have one
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* - temporarily hijack a kmap_atomic() slot and attach the page to it
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*/
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void flush_dcache_page(struct page *page)
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{
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unsigned long dampr2;
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void *vaddr;
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dampr2 = __get_DAMPR(2);
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vaddr = kmap_atomic(page, __KM_CACHE);
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frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE);
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kunmap_atomic(vaddr, __KM_CACHE);
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if (dampr2) {
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__set_DAMPR(2, dampr2);
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__set_IAMPR(2, dampr2);
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}
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} /* end flush_dcache_page() */
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EXPORT_SYMBOL(flush_dcache_page);
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/*****************************************************************************/
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/*
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* ICI takes a virtual address and the page may not currently have one
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* - so we temporarily attach the page to a bit of virtual space so that is can be flushed
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*/
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void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
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unsigned long start, unsigned long len)
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{
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unsigned long dampr2;
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void *vaddr;
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dampr2 = __get_DAMPR(2);
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vaddr = kmap_atomic(page, __KM_CACHE);
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start = (start & ~PAGE_MASK) | (unsigned long) vaddr;
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frv_cache_wback_inv(start, start + len);
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kunmap_atomic(vaddr, __KM_CACHE);
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if (dampr2) {
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__set_DAMPR(2, dampr2);
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__set_IAMPR(2, dampr2);
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}
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} /* end flush_icache_user_range() */
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EXPORT_SYMBOL(flush_icache_user_range);
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