LXR linux/arch/unicore32/include/asm/memory.h

   1/*
   2 * linux/arch/unicore32/include/asm/memory.h
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 * Copyright (C) 2001-2010 GUAN Xue-tao
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 *
  12 *  Note: this file should not be included by non-asm/.h files
  13 */
  14#ifndef __UNICORE_MEMORY_H__
  15#define __UNICORE_MEMORY_H__
  16
  17#include <linux/compiler.h>
  18#include <linux/const.h>
  19#include <asm/sizes.h>
  20#include <mach/memory.h>
  21
  22/*
  23 * Allow for constants defined here to be used from assembly code
  24 * by prepending the UL suffix only with actual C code compilation.
  25 */
  26#define UL(x) _AC(x, UL)
  27
  28/*
  29 * PAGE_OFFSET - the virtual address of the start of the kernel image
  30 * TASK_SIZE - the maximum size of a user space task.
  31 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  32 */
  33#define PAGE_OFFSET             UL(0xC0000000)
  34#define TASK_SIZE               (PAGE_OFFSET - UL(0x41000000))
  35#define TASK_UNMAPPED_BASE      (PAGE_OFFSET / 3)
  36
  37/*
  38 * The module space lives between the addresses given by TASK_SIZE
  39 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  40 */
  41#define MODULES_VADDR           (PAGE_OFFSET - 16*1024*1024)
  42#if TASK_SIZE > MODULES_VADDR
  43#error Top of user space clashes with start of module space
  44#endif
  45
  46#define MODULES_END             (PAGE_OFFSET)
  47
  48/*
  49 * Allow 16MB-aligned ioremap pages
  50 */
  51#define IOREMAP_MAX_ORDER       24
  52
  53/*
  54 * Physical vs virtual RAM address space conversion.  These are
  55 * private definitions which should NOT be used outside memory.h
  56 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
  57 */
  58#ifndef __virt_to_phys
  59#define __virt_to_phys(x)       ((x) - PAGE_OFFSET + PHYS_OFFSET)
  60#define __phys_to_virt(x)       ((x) - PHYS_OFFSET + PAGE_OFFSET)
  61#endif
  62
  63/*
  64 * Convert a physical address to a Page Frame Number and back
  65 */
  66#define __phys_to_pfn(paddr)    ((paddr) >> PAGE_SHIFT)
  67#define __pfn_to_phys(pfn)      ((pfn) << PAGE_SHIFT)
  68
  69/*
  70 * Convert a page to/from a physical address
  71 */
  72#define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
  73#define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
  74
  75#ifndef __ASSEMBLY__
  76
  77#ifndef arch_adjust_zones
  78#define arch_adjust_zones(size, holes) do { } while (0)
  79#endif
  80
  81/*
  82 * PFNs are used to describe any physical page; this means
  83 * PFN 0 == physical address 0.
  84 *
  85 * This is the PFN of the first RAM page in the kernel
  86 * direct-mapped view.  We assume this is the first page
  87 * of RAM in the mem_map as well.
  88 */
  89#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
  90
  91/*
  92 * Drivers should NOT use these either.
  93 */
  94#define __pa(x)                 __virt_to_phys((unsigned long)(x))
  95#define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))
  96#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
  97
  98/*
  99 * Conversion between a struct page and a physical address.
 100 *
 101 *  page_to_pfn(page)   convert a struct page * to a PFN number
 102 *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
 103 *
 104 *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 105 *  virt_addr_valid(k)  indicates whether a virtual address is valid
 106 */
 107#define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
 108
 109#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 110#define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && \
 111                (unsigned long)(kaddr) < (unsigned long)high_memory)
 112
 113#endif
 114
 115#include <asm-generic/memory_model.h>
 116
 117#endif
 118