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/* MS be sure that SLAB allocates aligned objects */
  35#define ARCH_KMALLOC_MINALIGN   L1_CACHE_BYTES
  36
  37#define ARCH_SLAB_MINALIGN      L1_CACHE_BYTES
  38
  39#define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
  40#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
  41
  42/* align addr on a size boundary - adjust address up/down if needed */
  43#define _ALIGN_UP(addr, size)   (((addr)+((size)-1))&(~((size)-1)))
  44#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
  45
  46/* align addr on a size boundary - adjust address up if needed */
  47#define _ALIGN(addr, size)      _ALIGN_UP(addr, size)
  48
  49#ifndef CONFIG_MMU
  50/*
  51 * PAGE_OFFSET -- the first address of the first page of memory. When not
  52 * using MMU this corresponds to the first free page in physical memory (aligned
  53 * on a page boundary).
  54 */
  55extern unsigned int __page_offset;
  56#define PAGE_OFFSET __page_offset
  57
  58#else /* CONFIG_MMU */
  59
  60/*
  61 * PAGE_OFFSET -- the first address of the first page of memory. With MMU
  62 * it is set to the kernel start address (aligned on a page boundary).
  63 *
  64 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
  65 * in arch/microblaze/Makefile.
  66 */
  67#define PAGE_OFFSET     CONFIG_KERNEL_START
  68
  69/*
  70 * The basic type of a PTE - 32 bit physical addressing.
  71 */
  72typedef unsigned long pte_basic_t;
  73#define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  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 */
  88typedef struct page *pgtable_t;
  89typedef struct { unsigned long  pte; }          pte_t;
  90typedef struct { unsigned long  pgprot; }       pgprot_t;
  91/* FIXME this can depend on linux kernel version */
  92#   ifdef CONFIG_MMU
  93typedef struct { unsigned long pmd; } pmd_t;
  94typedef struct { unsigned long pgd; } pgd_t;
  95#   else /* CONFIG_MMU */
  96typedef struct { unsigned long  ste[64]; }      pmd_t;
  97typedef struct { pmd_t          pue[1]; }       pud_t;
  98typedef struct { pud_t          pge[1]; }       pgd_t;
  99#   endif /* CONFIG_MMU */
 100
 101# define pte_val(x)     ((x).pte)
 102# define pgprot_val(x)  ((x).pgprot)
 103
 104#   ifdef CONFIG_MMU
 105#   define pmd_val(x)      ((x).pmd)
 106#   define pgd_val(x)      ((x).pgd)
 107#   else  /* CONFIG_MMU */
 108#   define pmd_val(x)   ((x).ste[0])
 109#   define pud_val(x)   ((x).pue[0])
 110#   define pgd_val(x)   ((x).pge[0])
 111#   endif  /* CONFIG_MMU */
 112
 113# define __pte(x)       ((pte_t) { (x) })
 114# define __pmd(x)       ((pmd_t) { (x) })
 115# define __pgd(x)       ((pgd_t) { (x) })
 116# define __pgprot(x)    ((pgprot_t) { (x) })
 117
 118/**
 119 * Conversions for virtual address, physical address, pfn, and struct
 120 * page are defined in the following files.
 121 *
 122 * virt -+
 123 *       | asm-microblaze/page.h
 124 * phys -+
 125 *       | linux/pfn.h
 126 *  pfn -+
 127 *       | asm-generic/memory_model.h
 128 * page -+
 129 *
 130 */
 131
 132extern unsigned long max_low_pfn;
 133extern unsigned long min_low_pfn;
 134extern unsigned long max_pfn;
 135
 136extern unsigned long memory_start;
 137extern unsigned long memory_end;
 138extern unsigned long memory_size;
 139
 140extern int page_is_ram(unsigned long pfn);
 141
 142# define phys_to_pfn(phys)      (PFN_DOWN(phys))
 143# define pfn_to_phys(pfn)       (PFN_PHYS(pfn))
 144
 145# define virt_to_pfn(vaddr)     (phys_to_pfn((__pa(vaddr))))
 146# define pfn_to_virt(pfn)       __va(pfn_to_phys((pfn)))
 147
 148#  ifdef CONFIG_MMU
 149
 150#  define virt_to_page(kaddr)   (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
 151#  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
 152#  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
 153
 154#  else /* CONFIG_MMU */
 155#  define virt_to_page(vaddr)   (pfn_to_page(virt_to_pfn(vaddr)))
 156#  define page_to_virt(page)    (pfn_to_virt(page_to_pfn(page)))
 157#  define page_to_phys(page)    (pfn_to_phys(page_to_pfn(page)))
 158#  define page_to_bus(page)     (page_to_phys(page))
 159#  define phys_to_page(paddr)   (pfn_to_page(phys_to_pfn(paddr)))
 160#  endif /* CONFIG_MMU */
 161
 162#  ifndef CONFIG_MMU
 163#  define pfn_valid(pfn)        (((pfn) >= min_low_pfn) && \
 164                                ((pfn) <= (min_low_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 */
 221