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Diffstat (limited to 'include/asm-i386/highmem.h')
-rw-r--r-- | include/asm-i386/highmem.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/include/asm-i386/highmem.h b/include/asm-i386/highmem.h new file mode 100644 index 000000000000..1df42bf347df --- /dev/null +++ b/include/asm-i386/highmem.h | |||
@@ -0,0 +1,79 @@ | |||
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 | |||
18 | #ifndef _ASM_HIGHMEM_H | ||
19 | #define _ASM_HIGHMEM_H | ||
20 | |||
21 | #ifdef __KERNEL__ | ||
22 | |||
23 | #include <linux/config.h> | ||
24 | #include <linux/interrupt.h> | ||
25 | #include <linux/threads.h> | ||
26 | #include <asm/kmap_types.h> | ||
27 | #include <asm/tlbflush.h> | ||
28 | |||
29 | /* declarations for highmem.c */ | ||
30 | extern unsigned long highstart_pfn, highend_pfn; | ||
31 | |||
32 | extern pte_t *kmap_pte; | ||
33 | extern pgprot_t kmap_prot; | ||
34 | extern pte_t *pkmap_page_table; | ||
35 | |||
36 | /* | ||
37 | * Right now we initialize only a single pte table. It can be extended | ||
38 | * easily, subsequent pte tables have to be allocated in one physical | ||
39 | * chunk of RAM. | ||
40 | */ | ||
41 | #ifdef CONFIG_X86_PAE | ||
42 | #define LAST_PKMAP 512 | ||
43 | #else | ||
44 | #define LAST_PKMAP 1024 | ||
45 | #endif | ||
46 | /* | ||
47 | * Ordering is: | ||
48 | * | ||
49 | * FIXADDR_TOP | ||
50 | * fixed_addresses | ||
51 | * FIXADDR_START | ||
52 | * temp fixed addresses | ||
53 | * FIXADDR_BOOT_START | ||
54 | * Persistent kmap area | ||
55 | * PKMAP_BASE | ||
56 | * VMALLOC_END | ||
57 | * Vmalloc area | ||
58 | * VMALLOC_START | ||
59 | * high_memory | ||
60 | */ | ||
61 | #define PKMAP_BASE ( (FIXADDR_BOOT_START - PAGE_SIZE*(LAST_PKMAP + 1)) & PMD_MASK ) | ||
62 | #define LAST_PKMAP_MASK (LAST_PKMAP-1) | ||
63 | #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) | ||
64 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) | ||
65 | |||
66 | extern void * FASTCALL(kmap_high(struct page *page)); | ||
67 | extern void FASTCALL(kunmap_high(struct page *page)); | ||
68 | |||
69 | void *kmap(struct page *page); | ||
70 | void kunmap(struct page *page); | ||
71 | void *kmap_atomic(struct page *page, enum km_type type); | ||
72 | void kunmap_atomic(void *kvaddr, enum km_type type); | ||
73 | struct page *kmap_atomic_to_page(void *ptr); | ||
74 | |||
75 | #define flush_cache_kmaps() do { } while (0) | ||
76 | |||
77 | #endif /* __KERNEL__ */ | ||
78 | |||
79 | #endif /* _ASM_HIGHMEM_H */ | ||