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Linux/arch/microblaze/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/fixmap.h>
 26 
 27 extern pte_t *kmap_pte;
 28 extern pgprot_t kmap_prot;
 29 extern pte_t *pkmap_page_table;
 30 
 31 /*
 32  * Right now we initialize only a single pte table. It can be extended
 33  * easily, subsequent pte tables have to be allocated in one physical
 34  * chunk of RAM.
 35  */
 36 /*
 37  * We use one full pte table with 4K pages. And with 16K/64K/256K pages pte
 38  * table covers enough memory (32MB/512MB/2GB resp.), so that both FIXMAP
 39  * and PKMAP can be placed in a single pte table. We use 512 pages for PKMAP
 40  * in case of 16K/64K/256K page sizes.
 41  */
 42 
 43 #define PKMAP_ORDER     PTE_SHIFT
 44 #define LAST_PKMAP      (1 << PKMAP_ORDER)
 45 
 46 #define PKMAP_BASE      ((FIXADDR_START - PAGE_SIZE * (LAST_PKMAP + 1)) \
 47                                                                 & PMD_MASK)
 48 
 49 #define LAST_PKMAP_MASK (LAST_PKMAP - 1)
 50 #define PKMAP_NR(virt)  ((virt - PKMAP_BASE) >> PAGE_SHIFT)
 51 #define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
 52 
 53 extern void *kmap_high(struct page *page);
 54 extern void kunmap_high(struct page *page);
 55 extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
 56 extern void __kunmap_atomic(void *kvaddr);
 57 
 58 static inline void *kmap(struct page *page)
 59 {
 60         might_sleep();
 61         if (!PageHighMem(page))
 62                 return page_address(page);
 63         return kmap_high(page);
 64 }
 65 
 66 static inline void kunmap(struct page *page)
 67 {
 68         BUG_ON(in_interrupt());
 69         if (!PageHighMem(page))
 70                 return;
 71         kunmap_high(page);
 72 }
 73 
 74 static inline void *kmap_atomic(struct page *page)
 75 {
 76         return kmap_atomic_prot(page, kmap_prot);
 77 }
 78 
 79 static inline struct page *kmap_atomic_to_page(void *ptr)
 80 {
 81         unsigned long idx, vaddr = (unsigned long) ptr;
 82         pte_t *pte;
 83 
 84         if (vaddr < FIXADDR_START)
 85                 return virt_to_page(ptr);
 86 
 87         idx = virt_to_fix(vaddr);
 88         pte = kmap_pte - (idx - FIX_KMAP_BEGIN);
 89         return pte_page(*pte);
 90 }
 91 
 92 #define flush_cache_kmaps()     { flush_icache(); flush_dcache(); }
 93 
 94 #endif /* __KERNEL__ */
 95 
 96 #endif /* _ASM_HIGHMEM_H */
 97 

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