arch/xtensa/include/asm/highmem.h

   1 /*
   2  * include/asm-xtensa/highmem.h
   3  *
   4  * This file is subject to the terms and conditions of the GNU General
   5  * Public License.  See the file "COPYING" in the main directory of
   6  * this archive for more details.
   7  *
   8  * Copyright (C) 2003 - 2005 Tensilica Inc.
   9  * Copyright (C) 2014 Cadence Design Systems Inc.
  10  */
  11
  12 #ifndef _XTENSA_HIGHMEM_H
  13 #define _XTENSA_HIGHMEM_H
  14
  15 #ifdef CONFIG_HIGHMEM
  16 #include <linux/wait.h>
  17 #include <linux/pgtable.h>
  18 #include <asm/cacheflush.h>
  19 #include <asm/fixmap.h>
  20
  21 #define PKMAP_BASE              ((FIXADDR_START -                       \
  22                                   (LAST_PKMAP + 1) * PAGE_SIZE) & PMD_MASK)
  23 #define LAST_PKMAP              (PTRS_PER_PTE * DCACHE_N_COLORS)
  24 #define LAST_PKMAP_MASK         (LAST_PKMAP - 1)
  25 #define PKMAP_NR(virt)          (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
  26 #define PKMAP_ADDR(nr)          (PKMAP_BASE + ((nr) << PAGE_SHIFT))
  27
  28 #define kmap_prot               PAGE_KERNEL_EXEC
  29
  30 #if DCACHE_WAY_SIZE > PAGE_SIZE
  31 #define get_pkmap_color get_pkmap_color
  32 static inline int get_pkmap_color(struct page *page)
  33 {
  34         return DCACHE_ALIAS(page_to_phys(page));
  35 }
  36
  37 extern unsigned int last_pkmap_nr_arr[];
  38
  39 static inline unsigned int get_next_pkmap_nr(unsigned int color)
  40 {
  41         last_pkmap_nr_arr[color] =
  42                 (last_pkmap_nr_arr[color] + DCACHE_N_COLORS) & LAST_PKMAP_MASK;
  43         return last_pkmap_nr_arr[color] + color;
  44 }
  45
  46 static inline int no_more_pkmaps(unsigned int pkmap_nr, unsigned int color)
  47 {
  48         return pkmap_nr < DCACHE_N_COLORS;
  49 }
  50
  51 static inline int get_pkmap_entries_count(unsigned int color)
  52 {
  53         return LAST_PKMAP / DCACHE_N_COLORS;
  54 }
  55
  56 extern wait_queue_head_t pkmap_map_wait_arr[];
  57
  58 static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
  59 {
  60         return pkmap_map_wait_arr + color;
  61 }
  62
  63 enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn);
  64 #define arch_kmap_local_map_idx         kmap_local_map_idx
  65
  66 enum fixed_addresses kmap_local_unmap_idx(int type, unsigned long addr);
  67 #define arch_kmap_local_unmap_idx       kmap_local_unmap_idx
  68
  69 #endif
  70
  71 extern pte_t *pkmap_page_table;
  72
  73 static inline void flush_cache_kmaps(void)
  74 {
  75         flush_cache_all();
  76 }
  77
  78 #define arch_kmap_local_post_unmap(vaddr)       \
  79         local_flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE)
  80
  81 void kmap_init(void);
  82
  83 #endif /* CONFIG_HIGHMEM */
  84 #endif