projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| bbc17704 JH |
1 | #ifndef _ASM_HIGHMEM_H |
| 2 | #define _ASM_HIGHMEM_H | |
| 3 | ||
| 4 | #include <asm/cacheflush.h> | |
| 5 | #include <asm/kmap_types.h> | |
| 6 | #include <asm/fixmap.h> | |
| 7 | ||
| 8 | /* | |
| 9 | * Right now we initialize only a single pte table. It can be extended | |
| 10 | * easily, subsequent pte tables have to be allocated in one physical | |
| 11 | * chunk of RAM. | |
| 12 | */ | |
| 13 | /* | |
| 14 | * Ordering is (from lower to higher memory addresses): | |
| 15 | * | |
| 16 | * high_memory | |
| 17 | * Persistent kmap area | |
| 18 | * PKMAP_BASE | |
| 19 | * fixed_addresses | |
| 20 | * FIXADDR_START | |
| 21 | * FIXADDR_TOP | |
| 22 | * Vmalloc area | |
| 23 | * VMALLOC_START | |
| 24 | * VMALLOC_END | |
| 25 | */ | |
| 26 | #define PKMAP_BASE (FIXADDR_START - PMD_SIZE) | |
| 27 | #define LAST_PKMAP PTRS_PER_PTE | |
| 28 | #define LAST_PKMAP_MASK (LAST_PKMAP - 1) | |
| 29 | #define PKMAP_NR(virt) (((virt) - PKMAP_BASE) >> PAGE_SHIFT) | |
| 30 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) | |
| 31 | ||
| 32 | #define kmap_prot PAGE_KERNEL | |
| 33 | ||
| 34 | static inline void flush_cache_kmaps(void) | |
| 35 | { | |
| 36 | flush_cache_all(); | |
| 37 | } | |
| 38 | ||
| 39 | /* declarations for highmem.c */ | |
| 40 | extern unsigned long highstart_pfn, highend_pfn; | |
| 41 | ||
| 42 | extern pte_t *pkmap_page_table; | |
| 43 | ||
| 44 | extern void *kmap_high(struct page *page); | |
| 45 | extern void kunmap_high(struct page *page); | |
| 46 | ||
| 47 | extern void kmap_init(void); | |
| 48 | ||
| 49 | /* | |
| 50 | * The following functions are already defined by <linux/highmem.h> | |
| 51 | * when CONFIG_HIGHMEM is not set. | |
| 52 | */ | |
| 53 | #ifdef CONFIG_HIGHMEM | |
| 54 | extern void *kmap(struct page *page); | |
| 55 | extern void kunmap(struct page *page); | |
| 56 | extern void *kmap_atomic(struct page *page); | |
| 57 | extern void __kunmap_atomic(void *kvaddr); | |
| 58 | extern void *kmap_atomic_pfn(unsigned long pfn); | |
| bbc17704 JH |
59 | #endif |
| 60 | ||
| 61 | #endif |