[deliverable/linux.git] / include / asm-x86 / 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>

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

extern pte_t *kmap_pte;
extern pgprot_t kmap_prot;
extern pte_t *pkmap_page_table;

/*
 * 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 */
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
77ef50a5 VN	18	#ifndef ASM_X86__HIGHMEM_H
77ef50a5 VN	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>
1da177e4 LT	28
	29	/* declarations for highmem.c */
	30	extern unsigned long highstart_pfn, highend_pfn;
	31
	32	extern pte_t *kmap_pte;
	33	extern pgprot_t kmap_prot;
	34	extern pte_t *pkmap_page_table;
	35
	36	/*
	37	* Right now we initialize only a single pte table. It can be extended
	38	* easily, subsequent pte tables have to be allocated in one physical
	39	* chunk of RAM.
	40	*/
1da177e4 LT	41	/*
	42	* Ordering is:
	43	*
	44	* FIXADDR_TOP
	45	* fixed_addresses
	46	* FIXADDR_START
	47	* temp fixed addresses
	48	* FIXADDR_BOOT_START
	49	* Persistent kmap area
	50	* PKMAP_BASE
	51	* VMALLOC_END
	52	* Vmalloc area
	53	* VMALLOC_START
	54	* high_memory
	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);
ce6234b5	65	void kmap_atomic_prot(struct page page, enum km_type type, pgprot_t prot);
1da177e4 LT	66	void kmap_atomic(struct page page, enum km_type type);
1da177e4 LT	67	void kunmap_atomic(void *kvaddr, enum km_type type);
60e64d46	68	void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);
1da177e4 LT	69	struct page kmap_atomic_to_page(void ptr);
1da177e4 LT	70
ce6234b5 JF	71	#ifndef CONFIG_PARAVIRT
	72	#define kmap_atomic_pte(page, type) kmap_atomic(page, type)
	73	#endif
	74
1da177e4 LT	75	#define flush_cache_kmaps() do { } while (0)
1da177e4 LT	76
b5bc6c0e	77	extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
cc9f7a0c	78	unsigned long end_pfn);
b5bc6c0e	79
1da177e4 LT	80	#endif /* __KERNEL__ */
1da177e4 LT	81
77ef50a5	82	#endif /* ASM_X86__HIGHMEM_H */