[linux-2.6-block.git] / arch / x86 / include / asm / highmem.h

/*
 * highmem.h: virtual kernel memory mappings for high memory
 *
 * Used in CONFIG_HIGHMEM systems for memory pages which
 * are not addressable by direct kernel virtual addresses.
 *
 * Copyright (C) 1999 Gerhard Wichert, Siemens AG
 *		      Gerhard.Wichert@pdb.siemens.de
 *
 *
 * Redesigned the x86 32-bit VM architecture to deal with
 * up to 16 Terabyte physical memory. With current x86 CPUs
 * we now support up to 64 Gigabytes physical RAM.
 *
 * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
 */

#ifndef _ASM_X86_HIGHMEM_H
#define _ASM_X86_HIGHMEM_H

#ifdef __KERNEL__

#include <linux/interrupt.h>
#include <linux/threads.h>
#include <asm/kmap_types.h>
#include <asm/tlbflush.h>
#include <asm/paravirt.h>
#include <asm/fixmap.h>

/* declarations for highmem.c */
extern unsigned long highstart_pfn, highend_pfn;

/*
 * Right now we initialize only a single pte table. It can be extended
 * easily, subsequent pte tables have to be allocated in one physical
 * chunk of RAM.
 */
/*
 * Ordering is:
 *
 * high memory on:			              high_memory off:
 *    FIXADDR_TOP                                        FIXADDR_TOP
 *        fixed addresses                                    fixed addresses
 *    FIXADDR_START                                      FIXADDR_START
 *        temp fixed addresses/persistent kmap area      VMALLOC_END
 *    PKMAP_BASE                                             temp fixed addresses/vmalloc area
 *    VMALLOC_END                                        VMALLOC_START
 *        vmalloc area                                   high_memory
 *    VMALLOC_START
 *    high_memory
 *
 * The temp fixed area is only used during boot for early_ioremap(), and
 * it is unused when the ioremap() is functional. vmalloc/pkmap area become
 * available after early boot so the temp fixed area is available for re-use.
 */
#define LAST_PKMAP_MASK (LAST_PKMAP-1)
#define PKMAP_NR(virt)  ((virt-PKMAP_BASE) >> PAGE_SHIFT)
#define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))

extern void *kmap_high(struct page *page);
extern void kunmap_high(struct page *page);

void *kmap(struct page *page);
void kunmap(struct page *page);

void *kmap_atomic_prot(struct page *page, pgprot_t prot);
void *kmap_atomic(struct page *page);
void __kunmap_atomic(void *kvaddr);
void *kmap_atomic_pfn(unsigned long pfn);
void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);

#define flush_cache_kmaps()	do { } while (0)

extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
					unsigned long end_pfn);

#endif /* __KERNEL__ */

#endif /* _ASM_X86_HIGHMEM_H */
Commit	Line	Data
1da177e4 LT	1	/*
	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	*
b9c2fcf0	11	* Redesigned the x86 32-bit VM architecture to deal with
1da177e4 LT	12	* 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
1965aae3 PA	18	#ifndef _ASM_X86_HIGHMEM_H
1965aae3 PA	19	#define _ASM_X86_HIGHMEM_H
1da177e4 LT	20
	21	#ifdef __KERNEL__
	22
1da177e4 LT	23	#include <linux/interrupt.h>
	24	#include <linux/threads.h>
	25	#include <asm/kmap_types.h>
	26	#include <asm/tlbflush.h>
ce6234b5	27	#include <asm/paravirt.h>
fd940934	28	#include <asm/fixmap.h>
1da177e4 LT	29
	30	/* declarations for highmem.c */
	31	extern unsigned long highstart_pfn, highend_pfn;
	32
1da177e4 LT	33	/*
	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	*/
1da177e4 LT	38	/*
	39	* Ordering is:
	40	*
63e7b6d9 MH	41	* 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.
1da177e4	55	*/
1da177e4 LT	56	#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
599db4fe HH	60	extern void kmap_high(struct page page);
599db4fe HH	61	extern void kunmap_high(struct page *page);
1da177e4 LT	62
	63	void kmap(struct page page);
	64	void kunmap(struct page *page);
3e4d3af5 PZ	65
3e4d3af5 PZ	66	void kmap_atomic_prot(struct page page, pgprot_t prot);
a24401bc	67	void kmap_atomic(struct page page);
3e4d3af5 PZ	68	void __kunmap_atomic(void *kvaddr);
	69	void *kmap_atomic_pfn(unsigned long pfn);
	70	void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);
1da177e4 LT	71
	72	#define flush_cache_kmaps() do { } while (0)
	73
b5bc6c0e	74	extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
cc9f7a0c	75	unsigned long end_pfn);
b5bc6c0e	76
1da177e4 LT	77	#endif /* __KERNEL__ */
1da177e4 LT	78
1965aae3	79	#endif /* _ASM_X86_HIGHMEM_H */