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