Commit | Line | Data |
---|---|---|
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 | ||
18 | #ifndef _ASM_HIGHMEM_H | |
19 | #define _ASM_HIGHMEM_H | |
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> |
1da177e4 LT |
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); | |
ce6234b5 | 71 | void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot); |
1da177e4 LT |
72 | void *kmap_atomic(struct page *page, enum km_type type); |
73 | void kunmap_atomic(void *kvaddr, enum km_type type); | |
60e64d46 | 74 | void *kmap_atomic_pfn(unsigned long pfn, enum km_type type); |
1da177e4 LT |
75 | struct page *kmap_atomic_to_page(void *ptr); |
76 | ||
ce6234b5 JF |
77 | #ifndef CONFIG_PARAVIRT |
78 | #define kmap_atomic_pte(page, type) kmap_atomic(page, type) | |
79 | #endif | |
80 | ||
1da177e4 LT |
81 | #define flush_cache_kmaps() do { } while (0) |
82 | ||
83 | #endif /* __KERNEL__ */ | |
84 | ||
85 | #endif /* _ASM_HIGHMEM_H */ |