/*
* 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
* [email protected]
*
*
* 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 <[email protected]>
*/

#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, 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);
struct page *kmap_atomic_to_page(void *ptr);

#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 */