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1da177e4 LT |
1 | /* |
2 | * highmem.h: virtual kernel memory mappings for high memory | |
3 | * | |
4 | * Used in CONFIG_HIGHMEM systems for memory pages which | |
5 | * are not addressable by direct kernel virtual addresses. | |
6 | * | |
7 | * Copyright (C) 1999 Gerhard Wichert, Siemens AG | |
8 | * Gerhard.Wichert@pdb.siemens.de | |
9 | * | |
10 | * | |
11 | * Redesigned the x86 32-bit VM architecture to deal with | |
12 | * up to 16 Terabyte physical memory. With current x86 CPUs | |
13 | * we now support up to 64 Gigabytes physical RAM. | |
14 | * | |
15 | * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com> | |
16 | */ | |
17 | #ifndef _ASM_HIGHMEM_H | |
18 | #define _ASM_HIGHMEM_H | |
19 | ||
20 | #ifdef __KERNEL__ | |
21 | ||
1da177e4 LT |
22 | #include <linux/init.h> |
23 | #include <linux/interrupt.h> | |
ad76fb6b | 24 | #include <linux/uaccess.h> |
1da177e4 LT |
25 | #include <asm/kmap_types.h> |
26 | ||
27 | /* undef for production */ | |
28 | #define HIGHMEM_DEBUG 1 | |
29 | ||
30 | /* declarations for highmem.c */ | |
31 | extern unsigned long highstart_pfn, highend_pfn; | |
32 | ||
33 | extern pte_t *kmap_pte; | |
34 | extern pgprot_t kmap_prot; | |
35 | extern pte_t *pkmap_page_table; | |
36 | ||
37 | /* | |
38 | * Right now we initialize only a single pte table. It can be extended | |
39 | * easily, subsequent pte tables have to be allocated in one physical | |
40 | * chunk of RAM. | |
41 | */ | |
1da177e4 LT |
42 | #define LAST_PKMAP 1024 |
43 | #define LAST_PKMAP_MASK (LAST_PKMAP-1) | |
44 | #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) | |
45 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) | |
46 | ||
47 | extern void * kmap_high(struct page *page); | |
48 | extern void kunmap_high(struct page *page); | |
49 | ||
1da177e4 LT |
50 | extern void *__kmap(struct page *page); |
51 | extern void __kunmap(struct page *page); | |
52 | extern void *__kmap_atomic(struct page *page, enum km_type type); | |
53 | extern void __kunmap_atomic(void *kvaddr, enum km_type type); | |
60080265 | 54 | extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type); |
1da177e4 LT |
55 | extern struct page *__kmap_atomic_to_page(void *ptr); |
56 | ||
57 | #define kmap __kmap | |
58 | #define kunmap __kunmap | |
59 | #define kmap_atomic __kmap_atomic | |
60 | #define kunmap_atomic __kunmap_atomic | |
61 | #define kmap_atomic_to_page __kmap_atomic_to_page | |
62 | ||
63 | #define flush_cache_kmaps() flush_cache_all() | |
64 | ||
1da177e4 LT |
65 | #endif /* __KERNEL__ */ |
66 | ||
67 | #endif /* _ASM_HIGHMEM_H */ |