tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * Copyright (C) 1999 Gerhard Wichert, Siemens AG
3 * Gerhard.Wichert@pdb.siemens.de
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/kmap_types.h>
27#include <asm/tlbflush.h>
28#include <asm/homecache.h>
29
30/* declarations for highmem.c */
31extern unsigned long highstart_pfn, highend_pfn;
32
33extern pte_t *pkmap_page_table;
34
35/*
36 * Ordering is:
37 *
38 * FIXADDR_TOP
39 * fixed_addresses
40 * FIXADDR_START
41 * temp fixed addresses
42 * FIXADDR_BOOT_START
43 * Persistent kmap area
44 * PKMAP_BASE
45 * VMALLOC_END
46 * Vmalloc area
47 * VMALLOC_START
48 * high_memory
49 */
50#define LAST_PKMAP_MASK (LAST_PKMAP-1)
51#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
52#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
53
54void *kmap_high(struct page *page);
55void kunmap_high(struct page *page);
56void *kmap(struct page *page);
57void kunmap(struct page *page);
58void *kmap_fix_kpte(struct page *page, int finished);
59
60/* This macro is used only in map_new_virtual() to map "page". */
61#define kmap_prot page_to_kpgprot(page)
62
63void kunmap_atomic_notypecheck(void *kvaddr, enum km_type type);
64void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);
65void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot);
66struct page *kmap_atomic_to_page(void *ptr);
67void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot);
68void *kmap_atomic(struct page *page, enum km_type type);
69void kmap_atomic_fix_kpte(struct page *page, int finished);
70
71#define flush_cache_kmaps() do { } while (0)
72
73#endif /* _ASM_TILE_HIGHMEM_H */