Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 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 | extern void kmap_init(void); |
||
| 37 | |||
| 38 | /* |
||
| 39 | * Right now we initialize only a single pte table. It can be extended |
||
| 40 | * easily, subsequent pte tables have to be allocated in one physical |
||
| 41 | * chunk of RAM. |
||
| 42 | */ |
||
| 43 | #if NR_CPUS <= 32 |
||
| 44 | #define PKMAP_BASE (0xff800000UL) |
||
| 45 | #else |
||
| 46 | #define PKMAP_BASE (0xff600000UL) |
||
| 47 | #endif |
||
| 48 | #ifdef CONFIG_X86_PAE |
||
| 49 | #define LAST_PKMAP 512 |
||
| 50 | #else |
||
| 51 | #define LAST_PKMAP 1024 |
||
| 52 | #endif |
||
| 53 | #define LAST_PKMAP_MASK (LAST_PKMAP-1) |
||
| 54 | #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) |
||
| 55 | #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) |
||
| 56 | |||
| 57 | extern void * FASTCALL(kmap_high(struct page *page)); |
||
| 58 | extern void FASTCALL(kunmap_high(struct page *page)); |
||
| 59 | |||
| 60 | void *kmap(struct page *page); |
||
| 61 | void kunmap(struct page *page); |
||
| 62 | void *kmap_atomic(struct page *page, enum km_type type); |
||
| 63 | void kunmap_atomic(void *kvaddr, enum km_type type); |
||
| 64 | struct page *kmap_atomic_to_page(void *ptr); |
||
| 65 | |||
| 66 | #define flush_cache_kmaps() do { } while (0) |
||
| 67 | |||
| 68 | #endif /* __KERNEL__ */ |
||
| 69 | |||
| 70 | #endif /* _ASM_HIGHMEM_H */ |