projects / deliverable / linux.git / blame
| 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 | #ifndef _ASM_HIGHMEM_H | |
| 18 | #define _ASM_HIGHMEM_H | |
| 19 | ||
| 20 | #ifdef __KERNEL__ | |
| 21 | ||
| 1da177e4 | 22 | #include <linux/interrupt.h> |
| ad76fb6b | 23 | #include <linux/uaccess.h> |
| 1da177e4 LT |
24 | #include <asm/kmap_types.h> |
| 25 | ||
| 26 | /* undef for production */ | |
| 27 | #define HIGHMEM_DEBUG 1 | |
| 28 | ||
| 29 | /* declarations for highmem.c */ | |
| 30 | extern unsigned long highstart_pfn, highend_pfn; | |
| 31 | ||
| 1da177e4 LT |
32 | extern pte_t *pkmap_page_table; |
| 33 | ||
| 34 | /* | |
| 35 | * Right now we initialize only a single pte table. It can be extended | |
| 36 | * easily, subsequent pte tables have to be allocated in one physical | |
| 37 | * chunk of RAM. | |
| 38 | */ | |
| 1da177e4 LT |
39 | #define LAST_PKMAP 1024 |
| 40 | #define LAST_PKMAP_MASK (LAST_PKMAP-1) | |
| 70342287 RB |
41 | #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) |
| 42 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) | |
| 1da177e4 LT |
43 | |
| 44 | extern void * kmap_high(struct page *page); | |
| 45 | extern void kunmap_high(struct page *page); | |
| 46 | ||
| 3e4d3af5 PZ |
47 | extern void *kmap(struct page *page); |
| 48 | extern void kunmap(struct page *page); | |
| a24401bc | 49 | extern void *kmap_atomic(struct page *page); |
| 3e4d3af5 PZ |
50 | extern void __kunmap_atomic(void *kvaddr); |
| 51 | extern void *kmap_atomic_pfn(unsigned long pfn); | |
| 52 | extern struct page *kmap_atomic_to_page(void *ptr); | |
| 1da177e4 LT |
53 | |
| 54 | #define flush_cache_kmaps() flush_cache_all() | |
| 55 | ||
| bb86bf28 RB |
56 | extern void kmap_init(void); |
| 57 | ||
| 58 | #define kmap_prot PAGE_KERNEL | |
| 59 | ||
| 1da177e4 LT |
60 | #endif /* __KERNEL__ */ |
| 61 | ||
| 62 | #endif /* _ASM_HIGHMEM_H */ |