blob: 04e9d023168f9d098d6f6d90a2c4b8cbae4dc209 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Joe Perchesb9c2fcf2008-03-23 01:02:15 -070011 * Redesigned the x86 32-bit VM architecture to deal with
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * 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
H. Peter Anvin1965aae2008-10-22 22:26:29 -070018#ifndef _ASM_X86_HIGHMEM_H
19#define _ASM_X86_HIGHMEM_H
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21#ifdef __KERNEL__
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/interrupt.h>
24#include <linux/threads.h>
25#include <asm/kmap_types.h>
26#include <asm/tlbflush.h>
Jeremy Fitzhardingece6234b2007-05-02 19:27:15 +020027#include <asm/paravirt.h>
Keith Packardfd940932008-10-30 19:37:09 -070028#include <asm/fixmap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30/* declarations for highmem.c */
31extern unsigned long highstart_pfn, highend_pfn;
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033/*
34 * Right now we initialize only a single pte table. It can be extended
35 * easily, subsequent pte tables have to be allocated in one physical
36 * chunk of RAM.
37 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038/*
39 * Ordering is:
40 *
Minfei Huang63e7b6d2014-10-29 19:38:37 +080041 * high memory on: high_memory off:
42 * FIXADDR_TOP FIXADDR_TOP
43 * fixed addresses fixed addresses
44 * FIXADDR_START FIXADDR_START
45 * temp fixed addresses/persistent kmap area VMALLOC_END
46 * PKMAP_BASE temp fixed addresses/vmalloc area
47 * VMALLOC_END VMALLOC_START
48 * vmalloc area high_memory
49 * VMALLOC_START
50 * high_memory
51 *
52 * The temp fixed area is only used during boot for early_ioremap(), and
53 * it is unused when the ioremap() is functional. vmalloc/pkmap area become
54 * available after early boot so the temp fixed area is available for re-use.
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#define LAST_PKMAP_MASK (LAST_PKMAP-1)
57#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
58#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
59
Harvey Harrison599db4f2008-02-04 16:48:03 +010060extern void *kmap_high(struct page *page);
61extern void kunmap_high(struct page *page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63void *kmap(struct page *page);
64void kunmap(struct page *page);
Peter Zijlstra3e4d3af2010-10-26 14:21:51 -070065
66void *kmap_atomic_prot(struct page *page, pgprot_t prot);
Cong Wanga24401b2011-11-26 10:53:39 +080067void *kmap_atomic(struct page *page);
Peter Zijlstra3e4d3af2010-10-26 14:21:51 -070068void __kunmap_atomic(void *kvaddr);
69void *kmap_atomic_pfn(unsigned long pfn);
70void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071struct page *kmap_atomic_to_page(void *ptr);
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073#define flush_cache_kmaps() do { } while (0)
74
Yinghai Lub5bc6c02008-06-14 18:32:52 -070075extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
Yinghai Lucc9f7a02008-06-16 16:11:08 -070076 unsigned long end_pfn);
Yinghai Lub5bc6c02008-06-14 18:32:52 -070077
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#endif /* __KERNEL__ */
79
H. Peter Anvin1965aae2008-10-22 22:26:29 -070080#endif /* _ASM_X86_HIGHMEM_H */