/*

 * 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:

 *

 * FIXADDR_TOP

 * 			fixed_addresses

 * FIXADDR_START

 * 			temp fixed addresses

 * FIXADDR_BOOT_START

 * 			Persistent kmap area

 * PKMAP_BASE

 * VMALLOC_END

 * 			Vmalloc area

 * VMALLOC_START

 * high_memory

 */

#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, enum km_type type, pgprot_t prot);

void *kmap_atomic(struct page *page, enum km_type type);

void kunmap_atomic(void *kvaddr, enum km_type type);

void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);

struct page *kmap_atomic_to_page(void *ptr);

#ifndef CONFIG_PARAVIRT

#define kmap_atomic_pte(page, type)	kmap_atomic(page, type)

#endif

#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 */