LXR linux/arch/arm64/mm/flush.c

   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);
 101