target/linux/ubicom32/files/arch/ubicom32/include/asm/page.h

   1 /*
   2  * arch/ubicom32/include/asm/page.h
   3  *   Memory page related operations and definitions.
   4  *
   5  * (C) Copyright 2009, Ubicom, Inc.
   6  *
   7  * This file is part of the Ubicom32 Linux Kernel Port.
   8  *
   9  * The Ubicom32 Linux Kernel Port is free software: you can redistribute
  10  * it and/or modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation, either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * The Ubicom32 Linux Kernel Port is distributed in the hope that it
  15  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  16  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  * the GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with the Ubicom32 Linux Kernel Port.  If not,
  21  * see <http://www.gnu.org/licenses/>.
  22  *
  23  * Ubicom32 implementation derived from (with many thanks):
  24  *   arch/m68knommu
  25  *   arch/blackfin
  26  *   arch/parisc
  27  */
  28 #ifndef _ASM_UBICOM32_PAGE_H
  29 #define _ASM_UBICOM32_PAGE_H
  30
  31 /* PAGE_SHIFT determines the page size */
  32
  33 #define PAGE_SHIFT      12
  34 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  35 #define PAGE_MASK       (~(PAGE_SIZE-1))
  36
  37 #include <asm/setup.h>
  38
  39 #ifndef __ASSEMBLY__
  40
  41 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  42 #define free_user_page(page, addr)      free_page(addr)
  43
  44 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  45 #define copy_page(to,from)      memcpy((to), (from), PAGE_SIZE)
  46
  47 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  48 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  49
  50 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  51         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  52 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  53
  54 /*
  55  * These are used to make use of C type-checking..
  56  */
  57 typedef struct { unsigned long pte; } pte_t;
  58 typedef struct { unsigned long pmd[16]; } pmd_t;
  59 typedef struct { unsigned long pgd; } pgd_t;
  60 typedef struct { unsigned long pgprot; } pgprot_t;
  61 typedef struct page *pgtable_t;
  62
  63 #define pte_val(x)      ((x).pte)
  64 #define pmd_val(x)      ((&x)->pmd[0])
  65 #define pgd_val(x)      ((x).pgd)
  66 #define pgprot_val(x)   ((x).pgprot)
  67
  68 #define __pte(x)        ((pte_t) { (x) } )
  69 #define __pmd(x)        ((pmd_t) { (x) } )
  70 #define __pgd(x)        ((pgd_t) { (x) } )
  71 #define __pgprot(x)     ((pgprot_t) { (x) } )
  72
  73 extern unsigned long memory_start;
  74 extern unsigned long memory_end;
  75
  76 #endif /* !__ASSEMBLY__ */
  77
  78 #include <asm/page_offset.h>
  79
  80 #define PAGE_OFFSET             (PAGE_OFFSET_RAW)
  81
  82 #ifndef __ASSEMBLY__
  83
  84 #define __pa(vaddr)             virt_to_phys((void *)(vaddr))
  85 #define __va(paddr)             phys_to_virt((unsigned long)(paddr))
  86
  87 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  88 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
  89
  90 #define virt_to_page(addr)      (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
  91 #define page_to_virt(page)      ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  92
  93 #define pfn_to_page(pfn)        virt_to_page(pfn_to_virt(pfn))
  94 #define page_to_pfn(page)       virt_to_pfn(page_to_virt(page))
  95 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
  96
  97 #define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
  98                                 ((void *)(kaddr) < (void *)memory_end))
  99
 100 #endif /* __ASSEMBLY__ */
 101
 102 #ifdef __KERNEL__
 103 #include <asm-generic/page.h>
 104 #endif
 105
 106 #endif /* _ASM_UBICOM32_PAGE_H */