78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
|
/*
|
||
|
|
* 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, 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 */
|