1/*
 2 * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com)
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 *
 8 */
 9
10#ifndef _ASM_HIGHMEM_H
11#define _ASM_HIGHMEM_H
12
13#ifdef CONFIG_HIGHMEM
14
15#include <uapi/asm/page.h>
16#include <asm/kmap_types.h>
17
18/* start after vmalloc area */
19#define FIXMAP_BASE		(PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE)
20#define FIXMAP_SIZE		PGDIR_SIZE	/* only 1 PGD worth */
21#define KM_TYPE_NR		((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS)
22#define FIXMAP_ADDR(nr)		(FIXMAP_BASE + ((nr) << PAGE_SHIFT))
23
24/* start after fixmap area */
25#define PKMAP_BASE		(FIXMAP_BASE + FIXMAP_SIZE)
26#define PKMAP_SIZE		PGDIR_SIZE
27#define LAST_PKMAP		(PKMAP_SIZE >> PAGE_SHIFT)
28#define LAST_PKMAP_MASK		(LAST_PKMAP - 1)
29#define PKMAP_ADDR(nr)		(PKMAP_BASE + ((nr) << PAGE_SHIFT))
30#define PKMAP_NR(virt)		(((virt) - PKMAP_BASE) >> PAGE_SHIFT)
31
32#define kmap_prot		PAGE_KERNEL
33
34
35#include <asm/cacheflush.h>
36
37extern void *kmap(struct page *page);
38extern void *kmap_high(struct page *page);
39extern void *kmap_atomic(struct page *page);
40extern void __kunmap_atomic(void *kvaddr);
41extern void kunmap_high(struct page *page);
42
43extern void kmap_init(void);
44
45static inline void flush_cache_kmaps(void)
46{
47	flush_cache_all();
48}
49
50static inline void kunmap(struct page *page)
51{
52	BUG_ON(in_interrupt());
53	if (!PageHighMem(page))
54		return;
55	kunmap_high(page);
56}
57
58
59#endif
60
61#endif

 1/*
 2 * Copyright (C) 2015 Synopsys, Inc. (www.synopsys.com)
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 *
 8 */
 9
10#ifndef _ASM_HIGHMEM_H
11#define _ASM_HIGHMEM_H
12
13#ifdef CONFIG_HIGHMEM
14
15#include <uapi/asm/page.h>
16#include <asm/kmap_types.h>
17
18/* start after vmalloc area */
19#define FIXMAP_BASE		(PAGE_OFFSET - FIXMAP_SIZE - PKMAP_SIZE)
20#define FIXMAP_SIZE		PGDIR_SIZE	/* only 1 PGD worth */
21#define KM_TYPE_NR		((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS)
22#define FIXMAP_ADDR(nr)		(FIXMAP_BASE + ((nr) << PAGE_SHIFT))
23
24/* start after fixmap area */
25#define PKMAP_BASE		(FIXMAP_BASE + FIXMAP_SIZE)
26#define PKMAP_SIZE		PGDIR_SIZE
27#define LAST_PKMAP		(PKMAP_SIZE >> PAGE_SHIFT)
28#define LAST_PKMAP_MASK		(LAST_PKMAP - 1)
29#define PKMAP_ADDR(nr)		(PKMAP_BASE + ((nr) << PAGE_SHIFT))
30#define PKMAP_NR(virt)		(((virt) - PKMAP_BASE) >> PAGE_SHIFT)
31
32#define kmap_prot		PAGE_KERNEL
33
34
35#include <asm/cacheflush.h>
36
37extern void *kmap(struct page *page);
38extern void *kmap_high(struct page *page);
39extern void *kmap_atomic(struct page *page);
40extern void __kunmap_atomic(void *kvaddr);
41extern void kunmap_high(struct page *page);
42
43extern void kmap_init(void);
44
45static inline void flush_cache_kmaps(void)
46{
47	flush_cache_all();
48}
49
50static inline void kunmap(struct page *page)
51{
52	BUG_ON(in_interrupt());
53	if (!PageHighMem(page))
54		return;
55	kunmap_high(page);
56}
57
58
59#endif
60
61#endif