arch/arc/include/asm/highmem.h

   1 /*
   2  * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  */
   9
  10 #ifndef _ASM_HIGHMEM_H
  11 #define _ASM_HIGHMEM_H
  12
  13 #ifdef CONFIG_HIGHMEM
  14
  15 #include <uapi/asm/page.h>
  16 #include <asm/kmap_types.h>
  17
  18 /* start after vmalloc area */
  19 #define FIXMAP_BASE             (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE)
  20 #define FIXMAP_SIZE             PGDIR_SIZE      /* only 1 PGD worth */
  21 #define KM_TYPE_NR              ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS)
  22 #define FIXMAP_ADDR(nr)         (FIXMAP_BASE + ((nr) << PAGE_SHIFT))
  23
  24 /* start after fixmap area */
  25 #define PKMAP_BASE              (FIXMAP_BASE + FIXMAP_SIZE)
  26 #define PKMAP_SIZE              PGDIR_SIZE
  27 #define LAST_PKMAP              (PKMAP_SIZE >> PAGE_SHIFT)
  28 #define LAST_PKMAP_MASK         (LAST_PKMAP - 1)
  29 #define PKMAP_ADDR(nr)          (PKMAP_BASE + ((nr) << PAGE_SHIFT))
  30 #define PKMAP_NR(virt)          (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
  31
  32 #define kmap_prot               PAGE_KERNEL
  33
  34
  35 #include <asm/cacheflush.h>
  36
  37 extern void *kmap(struct page *page);
  38 extern void *kmap_high(struct page *page);
  39 extern void *kmap_atomic(struct page *page);
  40 extern void __kunmap_atomic(void *kvaddr);
  41 extern void kunmap_high(struct page *page);
  42
  43 extern void kmap_init(void);
  44
  45 static inline void flush_cache_kmaps(void)
  46 {
  47         flush_cache_all();
  48 }
  49
  50 static inline void kunmap(struct page *page)
  51 {
  52         BUG_ON(in_interrupt());
  53         if (!PageHighMem(page))
  54                 return;
  55         kunmap_high(page);
  56 }
  57
  58
  59 #endif
  60
  61 #endif