LXR linux/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
  32static inline int get_pkmap_color(struct page *page)
  33{
  34        return DCACHE_ALIAS(page_to_phys(page));
  35}
  36
  37extern unsigned int last_pkmap_nr_arr[];
  38
  39static 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
  46static inline int no_more_pkmaps(unsigned int pkmap_nr, unsigned int color)
  47{
  48        return pkmap_nr < DCACHE_N_COLORS;
  49}
  50
  51static inline int get_pkmap_entries_count(unsigned int color)
  52{
  53        return LAST_PKMAP / DCACHE_N_COLORS;
  54}
  55
  56extern wait_queue_head_t pkmap_map_wait_arr[];
  57
  58static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
  59{
  60        return pkmap_map_wait_arr + color;
  61}
  62
  63enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn);
  64#define arch_kmap_local_map_idx         kmap_local_map_idx
  65
  66enum 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
  71extern pte_t *pkmap_page_table;
  72
  73static 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
  81void kmap_init(void);
  82
  83#endif /* CONFIG_HIGHMEM */
  84#endif
  85