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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 | ||
34ae8e36 | 22 | #include <linux/bug.h> |
1da177e4 | 23 | #include <linux/interrupt.h> |
ad76fb6b | 24 | #include <linux/uaccess.h> |
34ae8e36 | 25 | #include <asm/cpu-features.h> |
1da177e4 LT |
26 | #include <asm/kmap_types.h> |
27 | ||
1da177e4 LT |
28 | /* declarations for highmem.c */ |
29 | extern unsigned long highstart_pfn, highend_pfn; | |
30 | ||
1da177e4 LT |
31 | extern pte_t *pkmap_page_table; |
32 | ||
33 | /* | |
34 | * Right now we initialize only a single pte table. It can be extended | |
35 | * easily, subsequent pte tables have to be allocated in one physical | |
36 | * chunk of RAM. | |
37 | */ | |
725a269b MN |
38 | #ifdef CONFIG_PHYS_ADDR_T_64BIT |
39 | #define LAST_PKMAP 512 | |
40 | #else | |
1da177e4 | 41 | #define LAST_PKMAP 1024 |
725a269b MN |
42 | #endif |
43 | ||
1da177e4 | 44 | #define LAST_PKMAP_MASK (LAST_PKMAP-1) |
70342287 RB |
45 | #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) |
46 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) | |
1da177e4 LT |
47 | |
48 | extern void * kmap_high(struct page *page); | |
49 | extern void kunmap_high(struct page *page); | |
50 | ||
3e4d3af5 PZ |
51 | extern void *kmap(struct page *page); |
52 | extern void kunmap(struct page *page); | |
a24401bc | 53 | extern void *kmap_atomic(struct page *page); |
3e4d3af5 PZ |
54 | extern void __kunmap_atomic(void *kvaddr); |
55 | extern void *kmap_atomic_pfn(unsigned long pfn); | |
1da177e4 | 56 | |
34ae8e36 | 57 | #define flush_cache_kmaps() BUG_ON(cpu_has_dc_aliases) |
1da177e4 | 58 | |
bb86bf28 RB |
59 | extern void kmap_init(void); |
60 | ||
61 | #define kmap_prot PAGE_KERNEL | |
62 | ||
1da177e4 LT |
63 | #endif /* __KERNEL__ */ |
64 | ||
65 | #endif /* _ASM_HIGHMEM_H */ |