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#include <linux/wait.h>
  16#include <asm/cacheflush.h>
  17#include <asm/fixmap.h>
  18#include <asm/kmap_types.h>
  19#include <asm/pgtable.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#endif
  63
  64extern pte_t *pkmap_page_table;
  65
  66void *kmap_high(struct page *page);
  67void kunmap_high(struct page *page);
  68
  69static inline void *kmap(struct page *page)
  70{
  71        BUG_ON(in_interrupt());
  72        if (!PageHighMem(page))
  73                return page_address(page);
  74        return kmap_high(page);
  75}
  76
  77static inline void kunmap(struct page *page)
  78{
  79        BUG_ON(in_interrupt());
  80        if (!PageHighMem(page))
  81                return;
  82        kunmap_high(page);
  83}
  84
  85static inline void flush_cache_kmaps(void)
  86{
  87        flush_cache_all();
  88}
  89
  90void *kmap_atomic(struct page *page);
  91void __kunmap_atomic(void *kvaddr);
  92
  93void kmap_init(void);
  94
  95#endif
  96