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#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 */
  56extern 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 */
  73typedef 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 */
  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_size;
 138extern unsigned long lowmem_size;
 139
 140extern unsigned long kernel_tlb;
 141
 142extern 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#  endif /* CONFIG_MMU */
 172
 173# endif /* __ASSEMBLY__ */
 174
 175#define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 176
 177# define __pa(x)        __virt_to_phys((unsigned long)(x))
 178# define __va(x)        ((void *)__phys_to_virt((unsigned long)(x)))
 179
 180/* Convert between virtual and physical address for MMU. */
 181/* Handle MicroBlaze processor with virtual memory. */
 182#ifndef CONFIG_MMU
 183#define __virt_to_phys(addr)    addr
 184#define __phys_to_virt(addr)    addr
 185#define tophys(rd, rs)  addik rd, rs, 0
 186#define tovirt(rd, rs)  addik rd, rs, 0
 187#else
 188#define __virt_to_phys(addr) \
 189        ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 190#define __phys_to_virt(addr) \
 191        ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 192#define tophys(rd, rs) \
 193        addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 194#define tovirt(rd, rs) \
 195        addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 196#endif /* CONFIG_MMU */
 197
 198#define TOPHYS(addr)  __virt_to_phys(addr)
 199
 200#ifdef CONFIG_MMU
 201
 202#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 203                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 204#endif /* CONFIG_MMU */
 205
 206#endif /* __KERNEL__ */
 207
 208#include <asm-generic/memory_model.h>
 209#include <asm-generic/getorder.h>
 210
 211#endif /* _ASM_MICROBLAZE_PAGE_H */
 212