arch/arm/include/asm/highmem.h

   1 #ifndef _ASM_HIGHMEM_H
   2 #define _ASM_HIGHMEM_H
   3
   4 #include <asm/kmap_types.h>
   5
   6 #define PKMAP_BASE              (PAGE_OFFSET - PMD_SIZE)
   7 #define LAST_PKMAP              PTRS_PER_PTE
   8 #define LAST_PKMAP_MASK         (LAST_PKMAP - 1)
   9 #define PKMAP_NR(virt)          (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
  10 #define PKMAP_ADDR(nr)          (PKMAP_BASE + ((nr) << PAGE_SHIFT))
  11
  12 #define kmap_prot               PAGE_KERNEL
  13
  14 #define flush_cache_kmaps() \
  15         do { \
  16                 if (cache_is_vivt()) \
  17                         flush_cache_all(); \
  18         } while (0)
  19
  20 extern pte_t *pkmap_page_table;
  21
  22 #define ARCH_NEEDS_KMAP_HIGH_GET
  23
  24 extern void *kmap_high(struct page *page);
  25 extern void *kmap_high_get(struct page *page);
  26 extern void kunmap_high(struct page *page);
  27
  28 extern void *kmap_high_l1_vipt(struct page *page, pte_t *saved_pte);
  29 extern void kunmap_high_l1_vipt(struct page *page, pte_t saved_pte);
  30
  31 /*
  32  * The following functions are already defined by <linux/highmem.h>
  33  * when CONFIG_HIGHMEM is not set.
  34  */
  35 #ifdef CONFIG_HIGHMEM
  36 extern void *kmap(struct page *page);
  37 extern void kunmap(struct page *page);
  38 extern void *kmap_atomic(struct page *page, enum km_type type);
  39 extern void kunmap_atomic(void *kvaddr, enum km_type type);
  40 extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);
  41 extern struct page *kmap_atomic_to_page(const void *ptr);
  42 #endif
  43
  44 #endif