LXR linux/arch/arc/include/asm/highmem.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com)
   4 */
   5
   6#ifndef _ASM_HIGHMEM_H
   7#define _ASM_HIGHMEM_H
   8
   9#ifdef CONFIG_HIGHMEM
  10
  11#include <uapi/asm/page.h>
  12#include <asm/kmap_types.h>
  13
  14/* start after vmalloc area */
  15#define FIXMAP_BASE             (PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE)
  16#define FIXMAP_SIZE             PGDIR_SIZE      /* only 1 PGD worth */
  17#define KM_TYPE_NR              ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS)
  18#define FIXMAP_ADDR(nr)         (FIXMAP_BASE + ((nr) << PAGE_SHIFT))
  19
  20/* start after fixmap area */
  21#define PKMAP_BASE              (FIXMAP_BASE + FIXMAP_SIZE)
  22#define PKMAP_SIZE              PGDIR_SIZE
  23#define LAST_PKMAP              (PKMAP_SIZE >> PAGE_SHIFT)
  24#define LAST_PKMAP_MASK         (LAST_PKMAP - 1)
  25#define PKMAP_ADDR(nr)          (PKMAP_BASE + ((nr) << PAGE_SHIFT))
  26#define PKMAP_NR(virt)          (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
  27
  28#define kmap_prot               PAGE_KERNEL
  29
  30
  31#include <asm/cacheflush.h>
  32
  33extern void *kmap(struct page *page);
  34extern void *kmap_high(struct page *page);
  35extern void *kmap_atomic(struct page *page);
  36extern void __kunmap_atomic(void *kvaddr);
  37extern void kunmap_high(struct page *page);
  38
  39extern void kmap_init(void);
  40
  41static inline void flush_cache_kmaps(void)
  42{
  43        flush_cache_all();
  44}
  45
  46static inline void kunmap(struct page *page)
  47{
  48        BUG_ON(in_interrupt());
  49        if (!PageHighMem(page))
  50                return;
  51        kunmap_high(page);
  52}
  53
  54
  55#endif
  56
  57#endif
  58