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 <asm/asm-compat.h>
  21 #include <linux/const.h>
  22
  23 #ifdef __KERNEL__
  24
  25 /* PAGE_SHIFT determines the page size */
  26 #define PAGE_SHIFT      (12)
  27 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  28 #define PAGE_MASK       (~(PAGE_SIZE-1))
  29
  30 #define LOAD_OFFSET     ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
  31
  32 #ifndef __ASSEMBLY__
  33
  34 #define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
  35 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
  36
  37 /* align addr on a size boundary - adjust address up/down if needed */
  38 #define _ALIGN_UP(addr, size)   (((addr)+((size)-1))&(~((size)-1)))
  39 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
  40
  41 /* align addr on a size boundary - adjust address up if needed */
  42 #define _ALIGN(addr, size)      _ALIGN_UP(addr, size)
  43
  44 #ifndef CONFIG_MMU
  45 /*
  46  * PAGE_OFFSET -- the first address of the first page of memory. When not
  47  * using MMU this corresponds to the first free page in physical memory (aligned
  48  * on a page boundary).
  49  */
  50 extern unsigned int __page_offset;
  51 #define PAGE_OFFSET __page_offset
  52
  53 #else /* CONFIG_MMU */
  54
  55 /*
  56  * PAGE_OFFSET -- the first address of the first page of memory. With MMU
  57  * it is set to the kernel start address (aligned on a page boundary).
  58  *
  59  * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
  60  * in arch/microblaze/Makefile.
  61  */
  62 #define PAGE_OFFSET     CONFIG_KERNEL_START
  63
  64 /*
  65  * MAP_NR -- given an address, calculate the index of the page struct which
  66  * points to the address's page.
  67  */
  68 #define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
  69
  70 /*
  71  * The basic type of a PTE - 32 bit physical addressing.
  72  */
  73 typedef unsigned long pte_basic_t;
  74 #define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  75 #define PTE_FMT         "%.8lx"
  76
  77 #endif /* CONFIG_MMU */
  78
  79 #  ifndef CONFIG_MMU
  80 #  define copy_page(to, from)                   memcpy((to), (from), PAGE_SIZE)
  81 #  define get_user_page(vaddr)                  __get_free_page(GFP_KERNEL)
  82 #  define free_user_page(page, addr)            free_page(addr)
  83 #  else /* CONFIG_MMU */
  84 extern void copy_page(void *to, void *from);
  85 #  endif /* CONFIG_MMU */
  86
  87 # define clear_page(pgaddr)                     memset((pgaddr), 0, PAGE_SIZE)
  88
  89 # define clear_user_page(pgaddr, vaddr, page)   memset((pgaddr), 0, PAGE_SIZE)
  90 # define copy_user_page(vto, vfrom, vaddr, topg) \
  91                         memcpy((vto), (vfrom), PAGE_SIZE)
  92
  93 /*
  94  * These are used to make use of C type-checking..
  95  */
  96 typedef struct page *pgtable_t;
  97 typedef struct { unsigned long  pte; }          pte_t;
  98 typedef struct { unsigned long  pgprot; }       pgprot_t;
  99 /* FIXME this can depend on linux kernel version */
 100 #   ifdef CONFIG_MMU
 101 typedef struct { unsigned long pmd; } pmd_t;
 102 typedef struct { unsigned long pgd; } pgd_t;
 103 #   else /* CONFIG_MMU */
 104 typedef struct { unsigned long  ste[64]; }      pmd_t;
 105 typedef struct { pmd_t          pue[1]; }       pud_t;
 106 typedef struct { pud_t          pge[1]; }       pgd_t;
 107 #   endif /* CONFIG_MMU */
 108
 109 # define pte_val(x)     ((x).pte)
 110 # define pgprot_val(x)  ((x).pgprot)
 111
 112 #   ifdef CONFIG_MMU
 113 #   define pmd_val(x)      ((x).pmd)
 114 #   define pgd_val(x)      ((x).pgd)
 115 #   else  /* CONFIG_MMU */
 116 #   define pmd_val(x)   ((x).ste[0])
 117 #   define pud_val(x)   ((x).pue[0])
 118 #   define pgd_val(x)   ((x).pge[0])
 119 #   endif  /* CONFIG_MMU */
 120
 121 # define __pte(x)       ((pte_t) { (x) })
 122 # define __pmd(x)       ((pmd_t) { (x) })
 123 # define __pgd(x)       ((pgd_t) { (x) })
 124 # define __pgprot(x)    ((pgprot_t) { (x) })
 125
 126 /**
 127  * Conversions for virtual address, physical address, pfn, and struct
 128  * page are defined in the following files.
 129  *
 130  * virt -+
 131  *       | asm-microblaze/page.h
 132  * phys -+
 133  *       | linux/pfn.h
 134  *  pfn -+
 135  *       | asm-generic/memory_model.h
 136  * page -+
 137  *
 138  */
 139
 140 extern unsigned long max_low_pfn;
 141 extern unsigned long min_low_pfn;
 142 extern unsigned long max_pfn;
 143
 144 extern unsigned long memory_start;
 145 extern unsigned long memory_end;
 146 extern unsigned long memory_size;
 147
 148 extern int page_is_ram(unsigned long pfn);
 149
 150 # define phys_to_pfn(phys)      (PFN_DOWN(phys))
 151 # define pfn_to_phys(pfn)       (PFN_PHYS(pfn))
 152
 153 # define virt_to_pfn(vaddr)     (phys_to_pfn((__pa(vaddr))))
 154 # define pfn_to_virt(pfn)       __va(pfn_to_phys((pfn)))
 155
 156 #  ifdef CONFIG_MMU
 157 #  define virt_to_page(kaddr)   (mem_map +  MAP_NR(kaddr))
 158 #  else /* CONFIG_MMU */
 159 #  define virt_to_page(vaddr)   (pfn_to_page(virt_to_pfn(vaddr)))
 160 #  define page_to_virt(page)    (pfn_to_virt(page_to_pfn(page)))
 161 #  define page_to_phys(page)    (pfn_to_phys(page_to_pfn(page)))
 162 #  define page_to_bus(page)     (page_to_phys(page))
 163 #  define phys_to_page(paddr)   (pfn_to_page(phys_to_pfn(paddr)))
 164 #  endif /* CONFIG_MMU */
 165
 166 #  ifndef CONFIG_MMU
 167 #  define pfn_valid(pfn)        ((pfn) >= min_low_pfn && (pfn) <= max_mapnr)
 168 #  define ARCH_PFN_OFFSET       (PAGE_OFFSET >> PAGE_SHIFT)
 169 #  else /* CONFIG_MMU */
 170 #  define ARCH_PFN_OFFSET       (memory_start >> PAGE_SHIFT)
 171 #  define pfn_valid(pfn)        ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
 172 #  define VALID_PAGE(page)      ((page - mem_map) < max_mapnr)
 173 #  endif /* CONFIG_MMU */
 174
 175 # endif /* __ASSEMBLY__ */
 176
 177 #define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 178
 179
 180 #  ifndef CONFIG_MMU
 181 #  define __pa(vaddr)   ((unsigned long) (vaddr))
 182 #  define __va(paddr)   ((void *) (paddr))
 183 #  else /* CONFIG_MMU */
 184 #  define __pa(x)       __virt_to_phys((unsigned long)(x))
 185 #  define __va(x)       ((void *)__phys_to_virt((unsigned long)(x)))
 186 #  endif /* CONFIG_MMU */
 187
 188
 189 /* Convert between virtual and physical address for MMU. */
 190 /* Handle MicroBlaze processor with virtual memory. */
 191 #ifndef CONFIG_MMU
 192 #define __virt_to_phys(addr)    addr
 193 #define __phys_to_virt(addr)    addr
 194 #define tophys(rd, rs)  addik rd, rs, 0
 195 #define tovirt(rd, rs)  addik rd, rs, 0
 196 #else
 197 #define __virt_to_phys(addr) \
 198         ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 199 #define __phys_to_virt(addr) \
 200         ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 201 #define tophys(rd, rs) \
 202         addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 203 #define tovirt(rd, rs) \
 204         addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 205 #endif /* CONFIG_MMU */
 206
 207 #define TOPHYS(addr)  __virt_to_phys(addr)
 208
 209 #ifdef CONFIG_MMU
 210 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
 211 #define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */
 212 #endif
 213
 214 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 215                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 216 #endif /* CONFIG_MMU */
 217
 218 #endif /* __KERNEL__ */
 219
 220 #include <asm-generic/memory_model.h>
 221 #include <asm-generic/getorder.h>
 222
 223 #endif /* _ASM_MICROBLAZE_PAGE_H */