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 */
  30 extern unsigned long highstart_pfn, highend_pfn;
  31
  32 extern 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
  53 void *kmap_high(struct page *page);
  54 void kunmap_high(struct page *page);
  55 void *kmap(struct page *page);
  56 void kunmap(struct page *page);
  57 void *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
  62 void *__kmap_atomic(struct page *page);
  63 void __kunmap_atomic(void *kvaddr);
  64 void *kmap_atomic_pfn(unsigned long pfn);
  65 void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);
  66 struct page *kmap_atomic_to_page(void *ptr);
  67 void *kmap_atomic_prot(struct page *page, pgprot_t prot);
  68 void 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 */