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/tlbflush.h>
27#include <asm/homecache.h>
28
29/* declarations for highmem.c */
30extern unsigned long highstart_pfn, highend_pfn;
31
32extern 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
53void *kmap_high(struct page *page);
54void kunmap_high(struct page *page);
55void *kmap(struct page *page);
56void kunmap(struct page *page);
57void *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
62void *kmap_atomic(struct page *page);
63void __kunmap_atomic(void *kvaddr);
64void *kmap_atomic_pfn(unsigned long pfn);
65void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);
66struct page *kmap_atomic_to_page(void *ptr);
67void *kmap_atomic_prot(struct page *page, pgprot_t prot);
68void 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 */
73