LXR linux/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 */
  50extern 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 */
  73typedef 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 */
  84extern 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 */
  96typedef struct page *pgtable_t;
  97typedef struct { unsigned long  pte; }          pte_t;
  98typedef struct { unsigned long  pgprot; }       pgprot_t;
  99/* FIXME this can depend on linux kernel version */
 100#   ifdef CONFIG_MMU
 101typedef struct { unsigned long pmd; } pmd_t;
 102typedef struct { unsigned long pgd; } pgd_t;
 103#   else /* CONFIG_MMU */
 104typedef struct { unsigned long  ste[64]; }      pmd_t;
 105typedef struct { pmd_t          pue[1]; }       pud_t;
 106typedef 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
 140extern unsigned long max_low_pfn;
 141extern unsigned long min_low_pfn;
 142extern unsigned long max_pfn;
 143
 144extern unsigned long memory_start;
 145extern unsigned long memory_end;
 146extern unsigned long memory_size;
 147
 148extern 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 */
 224