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highmem.h
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1 /*
2  * Copyright (C) 1999 Gerhard Wichert, Siemens AG
4  * Copyright 2010 Tilera Corporation. All Rights Reserved.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation, version 2.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
13  * NON INFRINGEMENT. See the GNU General Public License for
14  * more details.
15  *
16  * Used in CONFIG_HIGHMEM systems for memory pages which
17  * are not addressable by direct kernel virtual addresses.
18  *
19  */
20 
21 #ifndef _ASM_TILE_HIGHMEM_H
22 #define _ASM_TILE_HIGHMEM_H
23 
24 #include <linux/interrupt.h>
25 #include <linux/threads.h>
26 #include <asm/tlbflush.h>
27 #include <asm/homecache.h>
28 
29 /* declarations for highmem.c */
30 extern unsigned long highstart_pfn, highend_pfn;
31 
32 extern pte_t *pkmap_page_table;
33 
34 /*
35  * Ordering is:
36  *
37  * FIXADDR_TOP
38  * fixed_addresses
39  * FIXADDR_START
40  * temp fixed addresses
41  * FIXADDR_BOOT_START
42  * Persistent kmap area
43  * PKMAP_BASE
44  * VMALLOC_END
45  * Vmalloc area
46  * VMALLOC_START
47  * high_memory
48  */
49 #define LAST_PKMAP_MASK (LAST_PKMAP-1)
50 #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
51 #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
52 
53 void *kmap_high(struct page *page);
54 void kunmap_high(struct page *page);
55 void *kmap(struct page *page);
56 void kunmap(struct page *page);
57 void *kmap_fix_kpte(struct page *page, int finished);
58 
59 /* This macro is used only in map_new_virtual() to map "page". */
60 #define kmap_prot page_to_kpgprot(page)
61 
62 void *kmap_atomic(struct page *page);
63 void __kunmap_atomic(void *kvaddr);
64 void *kmap_atomic_pfn(unsigned long pfn);
65 void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);
66 struct page *kmap_atomic_to_page(void *ptr);
67 void *kmap_atomic_prot(struct page *page, pgprot_t prot);
68 void kmap_atomic_fix_kpte(struct page *page, int finished);
69 
70 #define flush_cache_kmaps() do { } while (0)
71 
72 #endif /* _ASM_TILE_HIGHMEM_H */