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

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  1 #ifndef _ASM_HIGHMEM_H
  2 #define _ASM_HIGHMEM_H
  3 
  4 #include <asm/cacheflush.h>
  5 #include <asm/kmap_types.h>
  6 #include <asm/fixmap.h>
  7 
  8 /*
  9  * Right now we initialize only a single pte table. It can be extended
 10  * easily, subsequent pte tables have to be allocated in one physical
 11  * chunk of RAM.
 12  */
 13 /*
 14  * Ordering is (from lower to higher memory addresses):
 15  *
 16  * high_memory
 17  *                      Persistent kmap area
 18  * PKMAP_BASE
 19  *                      fixed_addresses
 20  * FIXADDR_START
 21  * FIXADDR_TOP
 22  *                      Vmalloc area
 23  * VMALLOC_START
 24  * VMALLOC_END
 25  */
 26 #define PKMAP_BASE              (FIXADDR_START - PMD_SIZE)
 27 #define LAST_PKMAP              PTRS_PER_PTE
 28 #define LAST_PKMAP_MASK         (LAST_PKMAP - 1)
 29 #define PKMAP_NR(virt)          (((virt) - PKMAP_BASE) >> PAGE_SHIFT)
 30 #define PKMAP_ADDR(nr)          (PKMAP_BASE + ((nr) << PAGE_SHIFT))
 31 
 32 #define kmap_prot               PAGE_KERNEL
 33 
 34 static inline void flush_cache_kmaps(void)
 35 {
 36         flush_cache_all();
 37 }
 38 
 39 /* declarations for highmem.c */
 40 extern unsigned long highstart_pfn, highend_pfn;
 41 
 42 extern pte_t *pkmap_page_table;
 43 
 44 extern void *kmap_high(struct page *page);
 45 extern void kunmap_high(struct page *page);
 46 
 47 extern void kmap_init(void);
 48 
 49 /*
 50  * The following functions are already defined by <linux/highmem.h>
 51  * when CONFIG_HIGHMEM is not set.
 52  */
 53 #ifdef CONFIG_HIGHMEM
 54 extern void *kmap(struct page *page);
 55 extern void kunmap(struct page *page);
 56 extern void *kmap_atomic(struct page *page);
 57 extern void __kunmap_atomic(void *kvaddr);
 58 extern void *kmap_atomic_pfn(unsigned long pfn);
 59 extern struct page *kmap_atomic_to_page(void *ptr);
 60 #endif
 61 
 62 #endif
 63 

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