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Linux/arch/mips/include/asm/highmem.h

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  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  *
 11  * Redesigned the x86 32-bit VM architecture to deal with
 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 #ifndef _ASM_HIGHMEM_H
 18 #define _ASM_HIGHMEM_H
 19 
 20 #ifdef __KERNEL__
 21 
 22 #include <linux/init.h>
 23 #include <linux/interrupt.h>
 24 #include <linux/uaccess.h>
 25 #include <asm/kmap_types.h>
 26 
 27 /* undef for production */
 28 #define HIGHMEM_DEBUG 1
 29 
 30 /* declarations for highmem.c */
 31 extern unsigned long highstart_pfn, highend_pfn;
 32 
 33 extern pte_t *pkmap_page_table;
 34 
 35 /*
 36  * Right now we initialize only a single pte table. It can be extended
 37  * easily, subsequent pte tables have to be allocated in one physical
 38  * chunk of RAM.
 39  */
 40 #define LAST_PKMAP 1024
 41 #define LAST_PKMAP_MASK (LAST_PKMAP-1)
 42 #define PKMAP_NR(virt)  ((virt-PKMAP_BASE) >> PAGE_SHIFT)
 43 #define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
 44 
 45 extern void * kmap_high(struct page *page);
 46 extern void kunmap_high(struct page *page);
 47 
 48 extern void *kmap(struct page *page);
 49 extern void kunmap(struct page *page);
 50 extern void *kmap_atomic(struct page *page);
 51 extern void __kunmap_atomic(void *kvaddr);
 52 extern void *kmap_atomic_pfn(unsigned long pfn);
 53 extern struct page *kmap_atomic_to_page(void *ptr);
 54 
 55 #define flush_cache_kmaps()     flush_cache_all()
 56 
 57 extern void kmap_init(void);
 58 
 59 #define kmap_prot PAGE_KERNEL
 60 
 61 #endif /* __KERNEL__ */
 62 
 63 #endif /* _ASM_HIGHMEM_H */
 64 

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