text: /*
   * High memory support for Xtensa architecture
   *
   * This file is subject to the terms and conditions of the GNU General
   * Public License.  See the file "COPYING" in the main directory of
   * this archive for more details.
   *
   * Copyright (C) 2014 Cadence Design Systems Inc.
   */
  
  #include <linux/export.h>
  #include <linux/highmem.h>
  #include <asm/tlbflush.h>
  
  #if DCACHE_WAY_SIZE > PAGE_SIZE
  unsigned int last_pkmap_nr_arr[DCACHE_N_COLORS];
  wait_queue_head_t pkmap_map_wait_arr[DCACHE_N_COLORS];
  
  static void __init kmap_waitqueues_init(void)
  {
  	unsigned int i;
  
  	for (i = 0; i < ARRAY_SIZE(pkmap_map_wait_arr); ++i)
  		init_waitqueue_head(pkmap_map_wait_arr + i);
  }
  
  static inline enum fixed_addresses kmap_idx(int type, unsigned long color)
  {
  	int idx = (type + KM_MAX_IDX * smp_processor_id()) * DCACHE_N_COLORS;
  
  	/*
  	 * The fixmap operates top down, so the color offset needs to be
  	 * reverse as well.
  	 */
  	return idx + DCACHE_N_COLORS - 1 - color;
  }
  
  enum fixed_addresses kmap_local_map_idx(int type, unsigned long pfn)
  {
  	return kmap_idx(type, DCACHE_ALIAS(pfn << PAGE_SHIFT));
  }
  
  enum fixed_addresses kmap_local_unmap_idx(int type, unsigned long addr)
  {
  	return kmap_idx(type, DCACHE_ALIAS(addr));
  }
  
  #else
  static inline void kmap_waitqueues_init(void) { }
  #endif
  
  void __init kmap_init(void)
  {
  	/* Check if this memory layout is broken because PKMAP overlaps
  	 * page table.
  	 */
  	BUILD_BUG_ON(PKMAP_BASE < TLBTEMP_BASE_1 + TLBTEMP_SIZE);
  	kmap_waitqueues_init();
  }
  