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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 | * | |
b9c2fcf0 | 11 | * Redesigned the x86 32-bit VM architecture to deal with |
1da177e4 LT |
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 | ||
1965aae3 PA |
18 | #ifndef _ASM_X86_HIGHMEM_H |
19 | #define _ASM_X86_HIGHMEM_H | |
1da177e4 LT |
20 | |
21 | #ifdef __KERNEL__ | |
22 | ||
1da177e4 LT |
23 | #include <linux/interrupt.h> |
24 | #include <linux/threads.h> | |
25 | #include <asm/kmap_types.h> | |
26 | #include <asm/tlbflush.h> | |
ce6234b5 | 27 | #include <asm/paravirt.h> |
fd940934 | 28 | #include <asm/fixmap.h> |
1da177e4 LT |
29 | |
30 | /* declarations for highmem.c */ | |
31 | extern unsigned long highstart_pfn, highend_pfn; | |
32 | ||
1da177e4 LT |
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 | */ | |
1da177e4 LT |
38 | /* |
39 | * Ordering is: | |
40 | * | |
63e7b6d9 MH |
41 | * high memory on: high_memory off: |
42 | * FIXADDR_TOP FIXADDR_TOP | |
43 | * fixed addresses fixed addresses | |
44 | * FIXADDR_START FIXADDR_START | |
45 | * temp fixed addresses/persistent kmap area VMALLOC_END | |
46 | * PKMAP_BASE temp fixed addresses/vmalloc area | |
47 | * VMALLOC_END VMALLOC_START | |
48 | * vmalloc area high_memory | |
49 | * VMALLOC_START | |
50 | * high_memory | |
51 | * | |
52 | * The temp fixed area is only used during boot for early_ioremap(), and | |
53 | * it is unused when the ioremap() is functional. vmalloc/pkmap area become | |
54 | * available after early boot so the temp fixed area is available for re-use. | |
1da177e4 | 55 | */ |
1da177e4 LT |
56 | #define LAST_PKMAP_MASK (LAST_PKMAP-1) |
57 | #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) | |
58 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) | |
59 | ||
599db4fe HH |
60 | extern void *kmap_high(struct page *page); |
61 | extern void kunmap_high(struct page *page); | |
1da177e4 LT |
62 | |
63 | void *kmap(struct page *page); | |
64 | void kunmap(struct page *page); | |
3e4d3af5 PZ |
65 | |
66 | void *kmap_atomic_prot(struct page *page, pgprot_t prot); | |
a24401bc | 67 | void *kmap_atomic(struct page *page); |
3e4d3af5 PZ |
68 | void __kunmap_atomic(void *kvaddr); |
69 | void *kmap_atomic_pfn(unsigned long pfn); | |
70 | void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot); | |
1da177e4 LT |
71 | |
72 | #define flush_cache_kmaps() do { } while (0) | |
73 | ||
b5bc6c0e | 74 | extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn, |
cc9f7a0c | 75 | unsigned long end_pfn); |
b5bc6c0e | 76 | |
1da177e4 LT |
77 | #endif /* __KERNEL__ */ |
78 | ||
1965aae3 | 79 | #endif /* _ASM_X86_HIGHMEM_H */ |