arch/nios2/include/asm/page.h

   1 /*
   2  * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
   3  * Copyright (C) 2004 Microtronix Datacom Ltd.
   4  *
   5  * MMU support based on asm/page.h from mips which is:
   6  *
   7  * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
   8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file "COPYING" in the main directory of this archive
  12  * for more details.
  13  */
  14
  15 #ifndef _ASM_NIOS2_PAGE_H
  16 #define _ASM_NIOS2_PAGE_H
  17
  18 #include <linux/pfn.h>
  19 #include <linux/const.h>
  20
  21 #include <vdso/page.h>
  22
  23 /*
  24  * PAGE_OFFSET -- the first address of the first page of memory.
  25  */
  26 #define PAGE_OFFSET     \
  27         (CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE)
  28
  29 #ifndef __ASSEMBLY__
  30
  31 /*
  32  * This gives the physical RAM offset.
  33  */
  34 #define PHYS_OFFSET             CONFIG_NIOS2_MEM_BASE
  35
  36 /*
  37  * It's normally defined only for FLATMEM config but it's
  38  * used in our early mem init code for all memory models.
  39  * So always define it.
  40  */
  41 #define ARCH_PFN_OFFSET         PFN_UP(PHYS_OFFSET)
  42
  43 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  44 #define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
  45
  46 struct page;
  47
  48 extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
  49 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  50                                 struct page *to);
  51
  52 /*
  53  * These are used to make use of C type-checking.
  54  */
  55 typedef struct page *pgtable_t;
  56 typedef struct { unsigned long pte; } pte_t;
  57 typedef struct { unsigned long pgd; } pgd_t;
  58 typedef struct { unsigned long pgprot; } pgprot_t;
  59
  60 #define pte_val(x)      ((x).pte)
  61 #define pgd_val(x)      ((x).pgd)
  62 #define pgprot_val(x)   ((x).pgprot)
  63
  64 #define __pte(x)        ((pte_t) { (x) })
  65 #define __pgd(x)        ((pgd_t) { (x) })
  66 #define __pgprot(x)     ((pgprot_t) { (x) })
  67
  68 extern unsigned long memory_start;
  69 extern unsigned long memory_end;
  70 extern unsigned long memory_size;
  71
  72 extern struct page *mem_map;
  73
  74 # define __pa(x)                \
  75         ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
  76 # define __va(x)                \
  77         ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
  78
  79 #define page_to_virt(page)      \
  80         ((void *)(((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
  81
  82 # define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
  83
  84 # define virt_to_page(vaddr)    pfn_to_page(PFN_DOWN(virt_to_phys(vaddr)))
  85 # define virt_addr_valid(vaddr) pfn_valid(PFN_DOWN(virt_to_phys(vaddr)))
  86
  87 # define VM_DATA_DEFAULT_FLAGS  VM_DATA_FLAGS_NON_EXEC
  88
  89 #include <asm-generic/memory_model.h>
  90
  91 #include <asm-generic/getorder.h>
  92
  93 #endif /* !__ASSEMBLY__ */
  94
  95 #endif /* _ASM_NIOS2_PAGE_H */