2005-04-17 02:20:36 +04:00
/*
* 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
*
*
2008-03-23 11:02:15 +03:00
* Redesigned the x86 32 - bit VM architecture to deal with
2005-04-17 02:20:36 +04:00
* 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 >
*/
2008-10-23 09:26:29 +04:00
# ifndef _ASM_X86_HIGHMEM_H
# define _ASM_X86_HIGHMEM_H
2005-04-17 02:20:36 +04:00
# ifdef __KERNEL__
# include <linux/interrupt.h>
# include <linux/threads.h>
# include <asm/kmap_types.h>
# include <asm/tlbflush.h>
2007-05-02 21:27:15 +04:00
# include <asm/paravirt.h>
2008-10-31 05:37:09 +03:00
# include <asm/fixmap.h>
2005-04-17 02:20:36 +04:00
/* 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 :
*
2014-10-29 14:38:37 +03:00
* 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 .
2005-04-17 02:20:36 +04:00
*/
# 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))
2008-02-04 18:48:03 +03:00
extern void * kmap_high ( struct page * page ) ;
extern void kunmap_high ( struct page * page ) ;
2005-04-17 02:20:36 +04:00
void * kmap ( struct page * page ) ;
void kunmap ( struct page * page ) ;
2010-10-27 01:21:51 +04:00
void * kmap_atomic_prot ( struct page * page , pgprot_t prot ) ;
2011-11-26 06:53:39 +04:00
void * kmap_atomic ( struct page * page ) ;
2010-10-27 01:21:51 +04:00
void __kunmap_atomic ( void * kvaddr ) ;
void * kmap_atomic_pfn ( unsigned long pfn ) ;
void * kmap_atomic_prot_pfn ( unsigned long pfn , pgprot_t prot ) ;
2005-04-17 02:20:36 +04:00
# define flush_cache_kmaps() do { } while (0)
2008-06-15 05:32:52 +04:00
extern void add_highpages_with_active_regions ( int nid , unsigned long start_pfn ,
2008-06-17 03:11:08 +04:00
unsigned long end_pfn ) ;
2008-06-15 05:32:52 +04:00
2005-04-17 02:20:36 +04:00
# endif /* __KERNEL__ */
2008-10-23 09:26:29 +04:00
# endif /* _ASM_X86_HIGHMEM_H */