1/*
  2 * Based on arch/arm/mm/flush.c
  3 *
  4 * Copyright (C) 1995-2002 Russell King
  5 * Copyright (C) 2012 ARM Ltd.
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10 *
 11 * This program is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 * GNU General Public License for more details.
 15 *
 16 * You should have received a copy of the GNU General Public License
 17 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 18 */
 19
 20#include <linux/export.h>
 21#include <linux/mm.h>
 22#include <linux/pagemap.h>
 23
 24#include <asm/cacheflush.h>
 25#include <asm/cachetype.h>
 26#include <asm/tlbflush.h>
 27
 28#include "mm.h"
 29
 30void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
 31		       unsigned long end)
 32{
 33	if (vma->vm_flags & VM_EXEC)
 34		__flush_icache_all();
 35}
 36
 37static void sync_icache_aliases(void *kaddr, unsigned long len)
 38{
 39	unsigned long addr = (unsigned long)kaddr;
 40
 41	if (icache_is_aliasing()) {
 42		__clean_dcache_area_pou(kaddr, len);
 43		__flush_icache_all();
 44	} else {
 45		flush_icache_range(addr, addr + len);
 46	}
 47}
 48
 49static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
 50				unsigned long uaddr, void *kaddr,
 51				unsigned long len)
 52{
 53	if (vma->vm_flags & VM_EXEC)
 54		sync_icache_aliases(kaddr, len);
 55}
 56
 57/*
 58 * Copy user data from/to a page which is mapped into a different processes
 59 * address space.  Really, we want to allow our "user space" model to handle
 60 * this.
 61 */
 62void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
 63		       unsigned long uaddr, void *dst, const void *src,
 64		       unsigned long len)
 65{
 66	memcpy(dst, src, len);
 67	flush_ptrace_access(vma, page, uaddr, dst, len);
 68}
 69
 70void __sync_icache_dcache(pte_t pte, unsigned long addr)
 71{
 72	struct page *page = pte_page(pte);
 73
 74	/* no flushing needed for anonymous pages */
 75	if (!page_mapping(page))
 76		return;
 77
 78	if (!test_and_set_bit(PG_dcache_clean, &page->flags))
 79		sync_icache_aliases(page_address(page),
 80				    PAGE_SIZE << compound_order(page));
 81	else if (icache_is_aivivt())
 82		__flush_icache_all();
 83}
 84
 85/*
 86 * This function is called when a page has been modified by the kernel. Mark
 87 * it as dirty for later flushing when mapped in user space (if executable,
 88 * see __sync_icache_dcache).
 89 */
 90void flush_dcache_page(struct page *page)
 91{
 92	if (test_bit(PG_dcache_clean, &page->flags))
 93		clear_bit(PG_dcache_clean, &page->flags);
 94}
 95EXPORT_SYMBOL(flush_dcache_page);
 96
 97/*
 98 * Additional functions defined in assembly.
 99 */
100EXPORT_SYMBOL(flush_icache_range);