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45890f6d VG |
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 | ||
37 | extern void *kmap(struct page *page); | |
38 | extern void *kmap_high(struct page *page); | |
39 | extern void *kmap_atomic(struct page *page); | |
40 | extern void __kunmap_atomic(void *kvaddr); | |
41 | extern void kunmap_high(struct page *page); | |
42 | ||
43 | extern void kmap_init(void); | |
44 | ||
45 | static inline void flush_cache_kmaps(void) | |
46 | { | |
47 | flush_cache_all(); | |
48 | } | |
49 | ||
50 | static 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 |