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  * Note: when converting an unknown physical address to a
 102  * struct page, the resulting pointer must be validated
 103  * using VALID_PAGE().  It must return an invalid struct page
 104  * for any physical address not corresponding to a system
 105  * RAM address.
 106  *
 107  *  page_to_pfn(page)   convert a struct page * to a PFN number
 108  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
 109  *
 110  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 111  *  virt_addr_valid(k)  indicates whether a virtual address is valid
 112  */
 113 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
 114
 115 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 116 #define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && \
 117                 (unsigned long)(kaddr) < (unsigned long)high_memory)
 118
 119 #endif
 120
 121 #include <asm-generic/memory_model.h>
 122
 123 #endif