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 | ||
| 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> | |
| 27 | ||
| 28 | /* declarations for highmem.c */ | |
| 29 | extern unsigned long highstart_pfn, highend_pfn; | |
| 30 | ||
| 31 | extern pte_t *kmap_pte; | |
| 32 | extern pgprot_t kmap_prot; | |
| 33 | extern pte_t *pkmap_page_table; | |
| 34 | ||
| 35 | /* | |
| 36 | * Right now we initialize only a single pte table. It can be extended | |
| 37 | * easily, subsequent pte tables have to be allocated in one physical | |
| 38 | * chunk of RAM. | |
| 39 | */ | |
| 40 | #ifdef CONFIG_X86_PAE | |
| 41 | #define LAST_PKMAP 512 | |
| 42 | #else | |
| 43 | #define LAST_PKMAP 1024 | |
| 44 | #endif | |
| 45 | /* | |
| 46 | * Ordering is: | |
| 47 | * | |
| 48 | * FIXADDR_TOP | |
| 49 | * fixed_addresses | |
| 50 | * FIXADDR_START | |
| 51 | * temp fixed addresses | |
| 52 | * FIXADDR_BOOT_START | |
| 53 | * Persistent kmap area | |
| 54 | * PKMAP_BASE | |
| 55 | * VMALLOC_END | |
| 56 | * Vmalloc area | |
| 57 | * VMALLOC_START | |
| 58 | * high_memory | |
| 59 | */ | |
| 60 | #define PKMAP_BASE ( (FIXADDR_BOOT_START - PAGE_SIZE*(LAST_PKMAP + 1)) & PMD_MASK ) | |
| 61 | #define LAST_PKMAP_MASK (LAST_PKMAP-1) | |
| 62 | #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) | |
| 63 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) | |
| 64 | ||
| 65 | extern void * FASTCALL(kmap_high(struct page *page)); | |
| 66 | extern void FASTCALL(kunmap_high(struct page *page)); | |
| 67 | ||
| 68 | void *kmap(struct page *page); | |
| 69 | void kunmap(struct page *page); | |
| 70 | void *kmap_atomic(struct page *page, enum km_type type); | |
| 71 | void kunmap_atomic(void *kvaddr, enum km_type type); | |
| 60e64d46 | 72 | void *kmap_atomic_pfn(unsigned long pfn, enum km_type type); |
| 1da177e4 LT |
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 */ |