arch/microblaze/include/asm/page.h

   1 /*
   2  * VM ops
   3  *
   4  * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
   5  * Copyright (C) 2008-2009 PetaLogix
   6  * Copyright (C) 2006 Atmark Techno, Inc.
   7  * Changes for MMU support:
   8  *    Copyright (C) 2007 Xilinx, Inc.  All rights reserved.
   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_MICROBLAZE_PAGE_H
  16 #define _ASM_MICROBLAZE_PAGE_H
  17
  18 #include <linux/pfn.h>
  19 #include <asm/setup.h>
  20 #include <linux/const.h>
  21
  22 #ifdef __KERNEL__
  23
  24 /* PAGE_SHIFT determines the page size */
  25 #define PAGE_SHIFT      (12)
  26 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  27 #define PAGE_MASK       (~(PAGE_SIZE-1))
  28
  29 #ifndef __ASSEMBLY__
  30
  31 #define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
  32 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
  33
  34 /* align addr on a size boundary - adjust address up/down if needed */
  35 #define _ALIGN_UP(addr, size)   (((addr)+((size)-1))&(~((size)-1)))
  36 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
  37
  38 /* align addr on a size boundary - adjust address up if needed */
  39 #define _ALIGN(addr, size)      _ALIGN_UP(addr, size)
  40
  41 #ifndef CONFIG_MMU
  42 /*
  43  * PAGE_OFFSET -- the first address of the first page of memory. When not
  44  * using MMU this corresponds to the first free page in physical memory (aligned
  45  * on a page boundary).
  46  */
  47 extern unsigned int __page_offset;
  48 #define PAGE_OFFSET __page_offset
  49
  50 #else /* CONFIG_MMU */
  51
  52 /*
  53  * PAGE_OFFSET -- the first address of the first page of memory. With MMU
  54  * it is set to the kernel start address (aligned on a page boundary).
  55  *
  56  * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
  57  * in arch/microblaze/Makefile.
  58  */
  59 #define PAGE_OFFSET     CONFIG_KERNEL_START
  60
  61 /*
  62  * MAP_NR -- given an address, calculate the index of the page struct which
  63  * points to the address's page.
  64  */
  65 #define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
  66
  67 /*
  68  * The basic type of a PTE - 32 bit physical addressing.
  69  */
  70 typedef unsigned long pte_basic_t;
  71 #define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  72 #define PTE_FMT         "%.8lx"
  73
  74 #endif /* CONFIG_MMU */
  75
  76 #  ifndef CONFIG_MMU
  77 #  define copy_page(to, from)                   memcpy((to), (from), PAGE_SIZE)
  78 #  define get_user_page(vaddr)                  __get_free_page(GFP_KERNEL)
  79 #  define free_user_page(page, addr)            free_page(addr)
  80 #  else /* CONFIG_MMU */
  81 extern void copy_page(void *to, void *from);
  82 #  endif /* CONFIG_MMU */
  83
  84 # define clear_page(pgaddr)                     memset((pgaddr), 0, PAGE_SIZE)
  85
  86 # define clear_user_page(pgaddr, vaddr, page)   memset((pgaddr), 0, PAGE_SIZE)
  87 # define copy_user_page(vto, vfrom, vaddr, topg) \
  88                         memcpy((vto), (vfrom), PAGE_SIZE)
  89
  90 /*
  91  * These are used to make use of C type-checking..
  92  */
  93 typedef struct page *pgtable_t;
  94 typedef struct { unsigned long  pte; }          pte_t;
  95 typedef struct { unsigned long  pgprot; }       pgprot_t;
  96 /* FIXME this can depend on linux kernel version */
  97 #   ifdef CONFIG_MMU
  98 typedef struct { unsigned long pmd; } pmd_t;
  99 typedef struct { unsigned long pgd; } pgd_t;
 100 #   else /* CONFIG_MMU */
 101 typedef struct { unsigned long  ste[64]; }      pmd_t;
 102 typedef struct { pmd_t          pue[1]; }       pud_t;
 103 typedef struct { pud_t          pge[1]; }       pgd_t;
 104 #   endif /* CONFIG_MMU */
 105
 106 # define pte_val(x)     ((x).pte)
 107 # define pgprot_val(x)  ((x).pgprot)
 108
 109 #   ifdef CONFIG_MMU
 110 #   define pmd_val(x)      ((x).pmd)
 111 #   define pgd_val(x)      ((x).pgd)
 112 #   else  /* CONFIG_MMU */
 113 #   define pmd_val(x)   ((x).ste[0])
 114 #   define pud_val(x)   ((x).pue[0])
 115 #   define pgd_val(x)   ((x).pge[0])
 116 #   endif  /* CONFIG_MMU */
 117
 118 # define __pte(x)       ((pte_t) { (x) })
 119 # define __pmd(x)       ((pmd_t) { (x) })
 120 # define __pgd(x)       ((pgd_t) { (x) })
 121 # define __pgprot(x)    ((pgprot_t) { (x) })
 122
 123 /**
 124  * Conversions for virtual address, physical address, pfn, and struct
 125  * page are defined in the following files.
 126  *
 127  * virt -+
 128  *       | asm-microblaze/page.h
 129  * phys -+
 130  *       | linux/pfn.h
 131  *  pfn -+
 132  *       | asm-generic/memory_model.h
 133  * page -+
 134  *
 135  */
 136
 137 extern unsigned long max_low_pfn;
 138 extern unsigned long min_low_pfn;
 139 extern unsigned long max_pfn;
 140
 141 extern unsigned long memory_start;
 142 extern unsigned long memory_end;
 143 extern unsigned long memory_size;
 144
 145 extern int page_is_ram(unsigned long pfn);
 146
 147 # define phys_to_pfn(phys)      (PFN_DOWN(phys))
 148 # define pfn_to_phys(pfn)       (PFN_PHYS(pfn))
 149
 150 # define virt_to_pfn(vaddr)     (phys_to_pfn((__pa(vaddr))))
 151 # define pfn_to_virt(pfn)       __va(pfn_to_phys((pfn)))
 152
 153 #  ifdef CONFIG_MMU
 154 #  define virt_to_page(kaddr)   (mem_map +  MAP_NR(kaddr))
 155 #  else /* CONFIG_MMU */
 156 #  define virt_to_page(vaddr)   (pfn_to_page(virt_to_pfn(vaddr)))
 157 #  define page_to_virt(page)    (pfn_to_virt(page_to_pfn(page)))
 158 #  define page_to_phys(page)    (pfn_to_phys(page_to_pfn(page)))
 159 #  define page_to_bus(page)     (page_to_phys(page))
 160 #  define phys_to_page(paddr)   (pfn_to_page(phys_to_pfn(paddr)))
 161 #  endif /* CONFIG_MMU */
 162
 163 #  ifndef CONFIG_MMU
 164 #  define pfn_valid(pfn)        ((pfn) >= min_low_pfn && (pfn) <= max_mapnr)
 165 #  define ARCH_PFN_OFFSET       (PAGE_OFFSET >> PAGE_SHIFT)
 166 #  else /* CONFIG_MMU */
 167 #  define ARCH_PFN_OFFSET       (memory_start >> PAGE_SHIFT)
 168 #  define pfn_valid(pfn)        ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
 169 #  define VALID_PAGE(page)      ((page - mem_map) < max_mapnr)
 170 #  endif /* CONFIG_MMU */
 171
 172 # endif /* __ASSEMBLY__ */
 173
 174 #define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 175
 176
 177 #  ifndef CONFIG_MMU
 178 #  define __pa(vaddr)   ((unsigned long) (vaddr))
 179 #  define __va(paddr)   ((void *) (paddr))
 180 #  else /* CONFIG_MMU */
 181 #  define __pa(x)       __virt_to_phys((unsigned long)(x))
 182 #  define __va(x)       ((void *)__phys_to_virt((unsigned long)(x)))
 183 #  endif /* CONFIG_MMU */
 184
 185
 186 /* Convert between virtual and physical address for MMU. */
 187 /* Handle MicroBlaze processor with virtual memory. */
 188 #ifndef CONFIG_MMU
 189 #define __virt_to_phys(addr)    addr
 190 #define __phys_to_virt(addr)    addr
 191 #define tophys(rd, rs)  addik rd, rs, 0
 192 #define tovirt(rd, rs)  addik rd, rs, 0
 193 #else
 194 #define __virt_to_phys(addr) \
 195         ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 196 #define __phys_to_virt(addr) \
 197         ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 198 #define tophys(rd, rs) \
 199         addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 200 #define tovirt(rd, rs) \
 201         addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 202 #endif /* CONFIG_MMU */
 203
 204 #define TOPHYS(addr)  __virt_to_phys(addr)
 205
 206 #ifdef CONFIG_MMU
 207 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
 208 #define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */
 209 #endif
 210
 211 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 212                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 213 #endif /* CONFIG_MMU */
 214
 215 #endif /* __KERNEL__ */
 216
 217 #include <asm-generic/memory_model.h>
 218 #include <asm-generic/getorder.h>
 219
 220 #endif /* _ASM_MICROBLAZE_PAGE_H */