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Linux/arch/x86/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 
 18 #ifndef _ASM_X86_HIGHMEM_H
 19 #define _ASM_X86_HIGHMEM_H
 20 
 21 #ifdef __KERNEL__
 22 
 23 #include <linux/interrupt.h>
 24 #include <linux/threads.h>
 25 #include <asm/kmap_types.h>
 26 #include <asm/tlbflush.h>
 27 #include <asm/paravirt.h>
 28 #include <asm/fixmap.h>
 29 
 30 /* declarations for highmem.c */
 31 extern unsigned long highstart_pfn, highend_pfn;
 32 
 33 /*
 34  * Right now we initialize only a single pte table. It can be extended
 35  * easily, subsequent pte tables have to be allocated in one physical
 36  * chunk of RAM.
 37  */
 38 /*
 39  * Ordering is:
 40  *
 41  * FIXADDR_TOP
 42  *                      fixed_addresses
 43  * FIXADDR_START
 44  *                      temp fixed addresses
 45  * FIXADDR_BOOT_START
 46  *                      Persistent kmap area
 47  * PKMAP_BASE
 48  * VMALLOC_END
 49  *                      Vmalloc area
 50  * VMALLOC_START
 51  * high_memory
 52  */
 53 #define LAST_PKMAP_MASK (LAST_PKMAP-1)
 54 #define PKMAP_NR(virt)  ((virt-PKMAP_BASE) >> PAGE_SHIFT)
 55 #define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
 56 
 57 extern void *kmap_high(struct page *page);
 58 extern void kunmap_high(struct page *page);
 59 
 60 void *kmap(struct page *page);
 61 void kunmap(struct page *page);
 62 
 63 void *kmap_atomic_prot(struct page *page, pgprot_t prot);
 64 void *kmap_atomic(struct page *page);
 65 void __kunmap_atomic(void *kvaddr);
 66 void *kmap_atomic_pfn(unsigned long pfn);
 67 void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);
 68 struct page *kmap_atomic_to_page(void *ptr);
 69 
 70 #define flush_cache_kmaps()     do { } while (0)
 71 
 72 extern void add_highpages_with_active_regions(int nid, unsigned long start_pfn,
 73                                         unsigned long end_pfn);
 74 
 75 #endif /* __KERNEL__ */
 76 
 77 #endif /* _ASM_X86_HIGHMEM_H */
 78 

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