LXR linux/arch/tile/include/asm/highmem.h

   1/*
   2 * Copyright (C) 1999 Gerhard Wichert, Siemens AG
   3 *                   Gerhard.Wichert@pdb.siemens.de
   4 * Copyright 2010 Tilera Corporation. All Rights Reserved.
   5 *
   6 *   This program is free software; you can redistribute it and/or
   7 *   modify it under the terms of the GNU General Public License
   8 *   as published by the Free Software Foundation, version 2.
   9 *
  10 *   This program is distributed in the hope that it will be useful, but
  11 *   WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  13 *   NON INFRINGEMENT.  See the GNU General Public License for
  14 *   more details.
  15 *
  16 * Used in CONFIG_HIGHMEM systems for memory pages which
  17 * are not addressable by direct kernel virtual addresses.
  18 *
  19 */
  20
  21#ifndef _ASM_TILE_HIGHMEM_H
  22#define _ASM_TILE_HIGHMEM_H
  23
  24#include <linux/interrupt.h>
  25#include <linux/threads.h>
  26#include <asm/tlbflush.h>
  27#include <asm/homecache.h>
  28
  29/* declarations for highmem.c */
  30extern unsigned long highstart_pfn, highend_pfn;
  31
  32extern pte_t *pkmap_page_table;
  33
  34/*
  35 * Ordering is:
  36 *
  37 * FIXADDR_TOP
  38 *                      fixed_addresses
  39 * FIXADDR_START
  40 *                      temp fixed addresses
  41 * FIXADDR_BOOT_START
  42 *                      Persistent kmap area
  43 * PKMAP_BASE
  44 * VMALLOC_END
  45 *                      Vmalloc area
  46 * VMALLOC_START
  47 * high_memory
  48 */
  49#define LAST_PKMAP_MASK (LAST_PKMAP-1)
  50#define PKMAP_NR(virt)  ((virt-PKMAP_BASE) >> PAGE_SHIFT)
  51#define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
  52
  53void *kmap_high(struct page *page);
  54void kunmap_high(struct page *page);
  55void *kmap(struct page *page);
  56void kunmap(struct page *page);
  57void *kmap_fix_kpte(struct page *page, int finished);
  58
  59/* This macro is used only in map_new_virtual() to map "page". */
  60#define kmap_prot page_to_kpgprot(page)
  61
  62void *__kmap_atomic(struct page *page);
  63void __kunmap_atomic(void *kvaddr);
  64void *kmap_atomic_pfn(unsigned long pfn);
  65void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);
  66struct page *kmap_atomic_to_page(void *ptr);
  67void *kmap_atomic_prot(struct page *page, pgprot_t prot);
  68void kmap_atomic_fix_kpte(struct page *page, int finished);
  69
  70#define flush_cache_kmaps()     do { } while (0)
  71
  72#endif /* _ASM_TILE_HIGHMEM_H */
  73