arch/microblaze/include/asm/page.h

   1 /*
   2  * Copyright (C) 2008 Michal Simek
   3  * Copyright (C) 2008 PetaLogix
   4  * Copyright (C) 2006 Atmark Techno, Inc.
   5  * Changes for MMU support:
   6  *    Copyright (C) 2007 Xilinx, Inc.  All rights reserved.
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License. See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  */
  12
  13 #ifndef _ASM_MICROBLAZE_PAGE_H
  14 #define _ASM_MICROBLAZE_PAGE_H
  15
  16 #include <linux/pfn.h>
  17 #include <asm/setup.h>
  18
  19 /* PAGE_SHIFT determines the page size */
  20 #define PAGE_SHIFT      (12)
  21 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  22 #define PAGE_MASK       (~(PAGE_SIZE-1))
  23
  24 #ifdef __KERNEL__
  25
  26 #ifndef __ASSEMBLY__
  27
  28 #define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
  29 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
  30
  31 /* align addr on a size boundary - adjust address up/down if needed */
  32 #define _ALIGN_UP(addr, size)   (((addr)+((size)-1))&(~((size)-1)))
  33 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
  34
  35 /* align addr on a size boundary - adjust address up if needed */
  36 #define _ALIGN(addr, size)      _ALIGN_UP(addr, size)
  37
  38 /*
  39  * PAGE_OFFSET -- the first address of the first page of memory. When not
  40  * using MMU this corresponds to the first free page in physical memory (aligned
  41  * on a page boundary).
  42  */
  43 extern unsigned int __page_offset;
  44 #define PAGE_OFFSET __page_offset
  45
  46 #define copy_page(to, from)                     memcpy((to), (from), PAGE_SIZE)
  47 #define get_user_page(vaddr)                    __get_free_page(GFP_KERNEL)
  48 #define free_user_page(page, addr)              free_page(addr)
  49
  50 #define clear_page(pgaddr)                      memset((pgaddr), 0, PAGE_SIZE)
  51
  52
  53 #define clear_user_page(pgaddr, vaddr, page)    memset((pgaddr), 0, PAGE_SIZE)
  54 #define copy_user_page(vto, vfrom, vaddr, topg) \
  55                         memcpy((vto), (vfrom), PAGE_SIZE)
  56
  57 /*
  58  * These are used to make use of C type-checking..
  59  */
  60 typedef struct page *pgtable_t;
  61 typedef struct { unsigned long  pte; }          pte_t;
  62 typedef struct { unsigned long  pgprot; }       pgprot_t;
  63 typedef struct { unsigned long  ste[64]; }      pmd_t;
  64 typedef struct { pmd_t          pue[1]; }       pud_t;
  65 typedef struct { pud_t          pge[1]; }       pgd_t;
  66
  67
  68 #define pte_val(x)      ((x).pte)
  69 #define pgprot_val(x)   ((x).pgprot)
  70 #define pmd_val(x)      ((x).ste[0])
  71 #define pud_val(x)      ((x).pue[0])
  72 #define pgd_val(x)      ((x).pge[0])
  73
  74 #define __pte(x)        ((pte_t) { (x) })
  75 #define __pmd(x)        ((pmd_t) { (x) })
  76 #define __pgd(x)        ((pgd_t) { (x) })
  77 #define __pgprot(x)     ((pgprot_t) { (x) })
  78
  79 /**
  80  * Conversions for virtual address, physical address, pfn, and struct
  81  * page are defined in the following files.
  82  *
  83  * virt -+
  84  *       | asm-microblaze/page.h
  85  * phys -+
  86  *       | linux/pfn.h
  87  *  pfn -+
  88  *       | asm-generic/memory_model.h
  89  * page -+
  90  *
  91  */
  92
  93 extern unsigned long max_low_pfn;
  94 extern unsigned long min_low_pfn;
  95 extern unsigned long max_pfn;
  96
  97 #define __pa(vaddr)             ((unsigned long) (vaddr))
  98 #define __va(paddr)             ((void *) (paddr))
  99
 100 #define phys_to_pfn(phys)       (PFN_DOWN(phys))
 101 #define pfn_to_phys(pfn)        (PFN_PHYS(pfn))
 102
 103 #define virt_to_pfn(vaddr)      (phys_to_pfn((__pa(vaddr))))
 104 #define pfn_to_virt(pfn)        __va(pfn_to_phys((pfn)))
 105
 106 #define virt_to_page(vaddr)     (pfn_to_page(virt_to_pfn(vaddr)))
 107 #define page_to_virt(page)      (pfn_to_virt(page_to_pfn(page)))
 108
 109 #define page_to_phys(page)      (pfn_to_phys(page_to_pfn(page)))
 110 #define page_to_bus(page)       (page_to_phys(page))
 111 #define phys_to_page(paddr)     (pfn_to_page(phys_to_pfn(paddr)))
 112
 113 extern unsigned int memory_start;
 114 extern unsigned int memory_end;
 115 extern unsigned int memory_size;
 116
 117 #define pfn_valid(pfn)          ((pfn) >= min_low_pfn && (pfn) < max_mapnr)
 118
 119 #define ARCH_PFN_OFFSET         (PAGE_OFFSET >> PAGE_SHIFT)
 120
 121 #else
 122 #define tophys(rd, rs)  (addik rd, rs, 0)
 123 #define tovirt(rd, rs)  (addik rd, rs, 0)
 124 #endif /* __ASSEMBLY__ */
 125
 126 #define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 127
 128 /* Convert between virtual and physical address for MMU.  */
 129 /* Handle MicroBlaze processor with virtual memory.  */
 130 #define __virt_to_phys(addr)    addr
 131 #define __phys_to_virt(addr)    addr
 132
 133 #define TOPHYS(addr)  __virt_to_phys(addr)
 134
 135 #endif /* __KERNEL__ */
 136
 137 #include <asm-generic/memory_model.h>
 138 #include <asm-generic/getorder.h>
 139
 140 #endif /* _ASM_MICROBLAZE_PAGE_H */