arch/microblaze/include/asm/page.h

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   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 #if defined(CONFIG_MICROBLAZE_64K_PAGES)
  27 #define PAGE_SHIFT              16
  28 #elif defined(CONFIG_MICROBLAZE_16K_PAGES)
  29 #define PAGE_SHIFT              14
  30 #else
  31 #define PAGE_SHIFT              12
  32 #endif
  33 #define PAGE_SIZE       (ASM_CONST(1) << PAGE_SHIFT)
  34 #define PAGE_MASK       (~(PAGE_SIZE-1))
  35 
  36 #define LOAD_OFFSET     ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
  37 
  38 #define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  39 
  40 #ifndef __ASSEMBLY__
  41 
  42 /* MS be sure that SLAB allocates aligned objects */
  43 #define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
  44 
  45 #define ARCH_SLAB_MINALIGN      L1_CACHE_BYTES
  46 
  47 #define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
  48 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
  49 
  50 #ifndef CONFIG_MMU
  51 /*
  52  * PAGE_OFFSET -- the first address of the first page of memory. When not
  53  * using MMU this corresponds to the first free page in physical memory (aligned
  54  * on a page boundary).
  55  */
  56 extern unsigned int __page_offset;
  57 #define PAGE_OFFSET __page_offset
  58 
  59 #else /* CONFIG_MMU */
  60 
  61 /*
  62  * PAGE_OFFSET -- the first address of the first page of memory. With MMU
  63  * it is set to the kernel start address (aligned on a page boundary).
  64  *
  65  * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
  66  * in arch/microblaze/Makefile.
  67  */
  68 #define PAGE_OFFSET     CONFIG_KERNEL_START
  69 
  70 /*
  71  * The basic type of a PTE - 32 bit physical addressing.
  72  */
  73 typedef unsigned long pte_basic_t;
  74 #define PTE_FMT         "%.8lx"
  75 
  76 #endif /* CONFIG_MMU */
  77 
  78 # define copy_page(to, from)                    memcpy((to), (from), PAGE_SIZE)
  79 # define clear_page(pgaddr)                     memset((pgaddr), 0, PAGE_SIZE)
  80 
  81 # define clear_user_page(pgaddr, vaddr, page)   memset((pgaddr), 0, PAGE_SIZE)
  82 # define copy_user_page(vto, vfrom, vaddr, topg) \
  83                         memcpy((vto), (vfrom), PAGE_SIZE)
  84 
  85 /*
  86  * These are used to make use of C type-checking..
  87  */
  88 typedef struct page *pgtable_t;
  89 typedef struct { unsigned long  pte; }          pte_t;
  90 typedef struct { unsigned long  pgprot; }       pgprot_t;
  91 /* FIXME this can depend on linux kernel version */
  92 #   ifdef CONFIG_MMU
  93 typedef struct { unsigned long pmd; } pmd_t;
  94 typedef struct { unsigned long pgd; } pgd_t;
  95 #   else /* CONFIG_MMU */
  96 typedef struct { unsigned long  ste[64]; }      pmd_t;
  97 typedef struct { pmd_t          pue[1]; }       pud_t;
  98 typedef struct { pud_t          p4e[1]; }       p4d_t;
  99 typedef struct { p4d_t          pge[1]; }       pgd_t;
 100 #   endif /* CONFIG_MMU */
 101 
 102 # define pte_val(x)     ((x).pte)
 103 # define pgprot_val(x)  ((x).pgprot)
 104 
 105 #   ifdef CONFIG_MMU
 106 #   define pmd_val(x)      ((x).pmd)
 107 #   define pgd_val(x)      ((x).pgd)
 108 #   else  /* CONFIG_MMU */
 109 #   define pmd_val(x)   ((x).ste[0])
 110 #   define pud_val(x)   ((x).pue[0])
 111 #   define pgd_val(x)   ((x).pge[0])
 112 #   endif  /* CONFIG_MMU */
 113 
 114 # define __pte(x)       ((pte_t) { (x) })
 115 # define __pmd(x)       ((pmd_t) { (x) })
 116 # define __pgd(x)       ((pgd_t) { (x) })
 117 # define __pgprot(x)    ((pgprot_t) { (x) })
 118 
 119 /**
 120  * Conversions for virtual address, physical address, pfn, and struct
 121  * page are defined in the following files.
 122  *
 123  * virt -+
 124  *       | asm-microblaze/page.h
 125  * phys -+
 126  *       | linux/pfn.h
 127  *  pfn -+
 128  *       | asm-generic/memory_model.h
 129  * page -+
 130  *
 131  */
 132 
 133 extern unsigned long max_low_pfn;
 134 extern unsigned long min_low_pfn;
 135 extern unsigned long max_pfn;
 136 
 137 extern unsigned long memory_start;
 138 extern unsigned long memory_size;
 139 extern unsigned long lowmem_size;
 140 
 141 extern unsigned long kernel_tlb;
 142 
 143 extern int page_is_ram(unsigned long pfn);
 144 
 145 # define phys_to_pfn(phys)      (PFN_DOWN(phys))
 146 # define pfn_to_phys(pfn)       (PFN_PHYS(pfn))
 147 
 148 # define virt_to_pfn(vaddr)     (phys_to_pfn((__pa(vaddr))))
 149 # define pfn_to_virt(pfn)       __va(pfn_to_phys((pfn)))
 150 
 151 #  ifdef CONFIG_MMU
 152 
 153 #  define virt_to_page(kaddr)   (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
 154 #  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
 155 #  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
 156 
 157 #  else /* CONFIG_MMU */
 158 #  define virt_to_page(vaddr)   (pfn_to_page(virt_to_pfn(vaddr)))
 159 #  define page_to_virt(page)    (pfn_to_virt(page_to_pfn(page)))
 160 #  define page_to_phys(page)    (pfn_to_phys(page_to_pfn(page)))
 161 #  define page_to_bus(page)     (page_to_phys(page))
 162 #  define phys_to_page(paddr)   (pfn_to_page(phys_to_pfn(paddr)))
 163 #  endif /* CONFIG_MMU */
 164 
 165 #  ifndef CONFIG_MMU
 166 #  define pfn_valid(pfn)        (((pfn) >= min_low_pfn) && \
 167                                 ((pfn) <= (min_low_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 #  endif /* CONFIG_MMU */
 173 
 174 # endif /* __ASSEMBLY__ */
 175 
 176 #define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 177 
 178 # define __pa(x)        __virt_to_phys((unsigned long)(x))
 179 # define __va(x)        ((void *)__phys_to_virt((unsigned long)(x)))
 180 
 181 /* Convert between virtual and physical address for MMU. */
 182 /* Handle MicroBlaze processor with virtual memory. */
 183 #ifndef CONFIG_MMU
 184 #define __virt_to_phys(addr)    addr
 185 #define __phys_to_virt(addr)    addr
 186 #define tophys(rd, rs)  addik rd, rs, 0
 187 #define tovirt(rd, rs)  addik rd, rs, 0
 188 #else
 189 #define __virt_to_phys(addr) \
 190         ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 191 #define __phys_to_virt(addr) \
 192         ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 193 #define tophys(rd, rs) \
 194         addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 195 #define tovirt(rd, rs) \
 196         addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 197 #endif /* CONFIG_MMU */
 198 
 199 #define TOPHYS(addr)  __virt_to_phys(addr)
 200 
 201 #ifdef CONFIG_MMU
 202 
 203 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 204                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 205 #endif /* CONFIG_MMU */
 206 
 207 #endif /* __KERNEL__ */
 208 
 209 #include <asm-generic/memory_model.h>
 210 #include <asm-generic/getorder.h>
 211 
 212 #endif /* _ASM_MICROBLAZE_PAGE_H */
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