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  * The basic type of a PTE - 32 bit physical addressing.
  66  */
  67 typedef unsigned long pte_basic_t;
  68 #define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  69 #define PTE_FMT         "%.8lx"
  70
  71 #endif /* CONFIG_MMU */
  72
  73 #  ifndef CONFIG_MMU
  74 #  define copy_page(to, from)                   memcpy((to), (from), PAGE_SIZE)
  75 #  define get_user_page(vaddr)                  __get_free_page(GFP_KERNEL)
  76 #  define free_user_page(page, addr)            free_page(addr)
  77 #  else /* CONFIG_MMU */
  78 extern void copy_page(void *to, void *from);
  79 #  endif /* CONFIG_MMU */
  80
  81 # define clear_page(pgaddr)                     memset((pgaddr), 0, PAGE_SIZE)
  82
  83 # define clear_user_page(pgaddr, vaddr, page)   memset((pgaddr), 0, PAGE_SIZE)
  84 # define copy_user_page(vto, vfrom, vaddr, topg) \
  85                         memcpy((vto), (vfrom), PAGE_SIZE)
  86
  87 /*
  88  * These are used to make use of C type-checking..
  89  */
  90 typedef struct page *pgtable_t;
  91 typedef struct { unsigned long  pte; }          pte_t;
  92 typedef struct { unsigned long  pgprot; }       pgprot_t;
  93 /* FIXME this can depend on linux kernel version */
  94 #   ifdef CONFIG_MMU
  95 typedef struct { unsigned long pmd; } pmd_t;
  96 typedef struct { unsigned long pgd; } pgd_t;
  97 #   else /* CONFIG_MMU */
  98 typedef struct { unsigned long  ste[64]; }      pmd_t;
  99 typedef struct { pmd_t          pue[1]; }       pud_t;
 100 typedef struct { pud_t          pge[1]; }       pgd_t;
 101 #   endif /* CONFIG_MMU */
 102
 103 # define pte_val(x)     ((x).pte)
 104 # define pgprot_val(x)  ((x).pgprot)
 105
 106 #   ifdef CONFIG_MMU
 107 #   define pmd_val(x)      ((x).pmd)
 108 #   define pgd_val(x)      ((x).pgd)
 109 #   else  /* CONFIG_MMU */
 110 #   define pmd_val(x)   ((x).ste[0])
 111 #   define pud_val(x)   ((x).pue[0])
 112 #   define pgd_val(x)   ((x).pge[0])
 113 #   endif  /* CONFIG_MMU */
 114
 115 # define __pte(x)       ((pte_t) { (x) })
 116 # define __pmd(x)       ((pmd_t) { (x) })
 117 # define __pgd(x)       ((pgd_t) { (x) })
 118 # define __pgprot(x)    ((pgprot_t) { (x) })
 119
 120 /**
 121  * Conversions for virtual address, physical address, pfn, and struct
 122  * page are defined in the following files.
 123  *
 124  * virt -+
 125  *       | asm-microblaze/page.h
 126  * phys -+
 127  *       | linux/pfn.h
 128  *  pfn -+
 129  *       | asm-generic/memory_model.h
 130  * page -+
 131  *
 132  */
 133
 134 extern unsigned long max_low_pfn;
 135 extern unsigned long min_low_pfn;
 136 extern unsigned long max_pfn;
 137
 138 extern unsigned long memory_start;
 139 extern unsigned long memory_end;
 140 extern unsigned long memory_size;
 141
 142 extern int page_is_ram(unsigned long pfn);
 143
 144 # define phys_to_pfn(phys)      (PFN_DOWN(phys))
 145 # define pfn_to_phys(pfn)       (PFN_PHYS(pfn))
 146
 147 # define virt_to_pfn(vaddr)     (phys_to_pfn((__pa(vaddr))))
 148 # define pfn_to_virt(pfn)       __va(pfn_to_phys((pfn)))
 149
 150 #  ifdef CONFIG_MMU
 151
 152 #  define virt_to_page(kaddr)   (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
 153 #  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
 154 #  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
 155
 156 #  else /* CONFIG_MMU */
 157 #  define virt_to_page(vaddr)   (pfn_to_page(virt_to_pfn(vaddr)))
 158 #  define page_to_virt(page)    (pfn_to_virt(page_to_pfn(page)))
 159 #  define page_to_phys(page)    (pfn_to_phys(page_to_pfn(page)))
 160 #  define page_to_bus(page)     (page_to_phys(page))
 161 #  define phys_to_page(paddr)   (pfn_to_page(phys_to_pfn(paddr)))
 162 #  endif /* CONFIG_MMU */
 163
 164 #  ifndef CONFIG_MMU
 165 #  define pfn_valid(pfn)        (((pfn) >= min_low_pfn) && \
 166                                 ((pfn) <= (min_low_pfn + max_mapnr)))
 167 #  define ARCH_PFN_OFFSET       (PAGE_OFFSET >> PAGE_SHIFT)
 168 #  else /* CONFIG_MMU */
 169 #  define ARCH_PFN_OFFSET       (memory_start >> PAGE_SHIFT)
 170 #  define pfn_valid(pfn)        ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
 171 #  define VALID_PAGE(page)      ((page - mem_map) < max_mapnr)
 172 #  endif /* CONFIG_MMU */
 173
 174 # endif /* __ASSEMBLY__ */
 175
 176 #define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 177
 178
 179 #  ifndef CONFIG_MMU
 180 #  define __pa(vaddr)   ((unsigned long) (vaddr))
 181 #  define __va(paddr)   ((void *) (paddr))
 182 #  else /* CONFIG_MMU */
 183 #  define __pa(x)       __virt_to_phys((unsigned long)(x))
 184 #  define __va(x)       ((void *)__phys_to_virt((unsigned long)(x)))
 185 #  endif /* CONFIG_MMU */
 186
 187
 188 /* Convert between virtual and physical address for MMU. */
 189 /* Handle MicroBlaze processor with virtual memory. */
 190 #ifndef CONFIG_MMU
 191 #define __virt_to_phys(addr)    addr
 192 #define __phys_to_virt(addr)    addr
 193 #define tophys(rd, rs)  addik rd, rs, 0
 194 #define tovirt(rd, rs)  addik rd, rs, 0
 195 #else
 196 #define __virt_to_phys(addr) \
 197         ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 198 #define __phys_to_virt(addr) \
 199         ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 200 #define tophys(rd, rs) \
 201         addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 202 #define tovirt(rd, rs) \
 203         addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 204 #endif /* CONFIG_MMU */
 205
 206 #define TOPHYS(addr)  __virt_to_phys(addr)
 207
 208 #ifdef CONFIG_MMU
 209 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC
 210 #define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */
 211 #endif
 212
 213 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 214                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 215 #endif /* CONFIG_MMU */
 216
 217 #endif /* __KERNEL__ */
 218
 219 #include <asm-generic/memory_model.h>
 220 #include <asm-generic/getorder.h>
 221
 222 #endif /* _ASM_MICROBLAZE_PAGE_H */