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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/asm-mips/highmem.h
2 * highmem.h: virtual kernel memory mappings for high memory
4 * Used in CONFIG_HIGHMEM systems for memory pages which
5 * are not addressable by direct kernel virtual addresses.
7 * Copyright (C) 1999 Gerhard Wichert, Siemens AG
8 * Gerhard.Wichert@pdb.siemens.de
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.
15 * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
17 #ifndef _ASM_HIGHMEM_H
18 #define _ASM_HIGHMEM_H
22 #include <linux/init.h>
23 #include <linux/interrupt.h>
24 #include <linux/uaccess.h>
25 #include <asm/kmap_types.h>
27 /* undef for production */
28 #define HIGHMEM_DEBUG 1
30 /* declarations for highmem.c */
31 extern unsigned long highstart_pfn
, highend_pfn
;
33 extern pte_t
*kmap_pte
;
34 extern pgprot_t kmap_prot
;
35 extern pte_t
*pkmap_page_table
;
38 * Right now we initialize only a single pte table. It can be extended
39 * easily, subsequent pte tables have to be allocated in one physical
42 #define PKMAP_BASE (0xfe000000UL)
43 #define LAST_PKMAP 1024
44 #define LAST_PKMAP_MASK (LAST_PKMAP-1)
45 #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
46 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
48 extern void * kmap_high(struct page
*page
);
49 extern void kunmap_high(struct page
*page
);
51 extern void *__kmap(struct page
*page
);
52 extern void __kunmap(struct page
*page
);
53 extern void *__kmap_atomic(struct page
*page
, enum km_type type
);
54 extern void __kunmap_atomic(void *kvaddr
, enum km_type type
);
55 extern void *kmap_atomic_pfn(unsigned long pfn
, enum km_type type
);
56 extern struct page
*__kmap_atomic_to_page(void *ptr
);
59 #define kunmap __kunmap
60 #define kmap_atomic __kmap_atomic
61 #define kunmap_atomic __kunmap_atomic
62 #define kmap_atomic_to_page __kmap_atomic_to_page
64 #define flush_cache_kmaps() flush_cache_all()
66 #endif /* __KERNEL__ */
68 #endif /* _ASM_HIGHMEM_H */