arch/arc/include/asm/page.h

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #ifndef __ASM_ARC_PAGE_H
   9 #define __ASM_ARC_PAGE_H
  10
  11 #include <uapi/asm/page.h>
  12
  13
  14 #ifndef __ASSEMBLY__
  15
  16 #define get_user_page(vaddr)            __get_free_page(GFP_KERNEL)
  17 #define free_user_page(page, addr)      free_page(addr)
  18
  19 #define clear_page(paddr)               memset((paddr), 0, PAGE_SIZE)
  20 #define copy_page(to, from)             memcpy((to), (from), PAGE_SIZE)
  21
  22 #ifndef CONFIG_ARC_CACHE_VIPT_ALIASING
  23
  24 #define clear_user_page(addr, vaddr, pg)        clear_page(addr)
  25 #define copy_user_page(vto, vfrom, vaddr, pg)   copy_page(vto, vfrom)
  26
  27 #else   /* VIPT aliasing dcache */
  28
  29 struct vm_area_struct;
  30 struct page;
  31
  32 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  33
  34 void copy_user_highpage(struct page *to, struct page *from,
  35                         unsigned long u_vaddr, struct vm_area_struct *vma);
  36 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
  37
  38 #endif  /* CONFIG_ARC_CACHE_VIPT_ALIASING */
  39
  40 #undef STRICT_MM_TYPECHECKS
  41
  42 #ifdef STRICT_MM_TYPECHECKS
  43 /*
  44  * These are used to make use of C type-checking..
  45  */
  46 typedef struct {
  47         unsigned long pte;
  48 } pte_t;
  49 typedef struct {
  50         unsigned long pgd;
  51 } pgd_t;
  52 typedef struct {
  53         unsigned long pgprot;
  54 } pgprot_t;
  55 typedef unsigned long pgtable_t;
  56
  57 #define pte_val(x)      ((x).pte)
  58 #define pgd_val(x)      ((x).pgd)
  59 #define pgprot_val(x)   ((x).pgprot)
  60
  61 #define __pte(x)        ((pte_t) { (x) })
  62 #define __pgd(x)        ((pgd_t) { (x) })
  63 #define __pgprot(x)     ((pgprot_t) { (x) })
  64
  65 #define pte_pgprot(x) __pgprot(pte_val(x))
  66
  67 #else /* !STRICT_MM_TYPECHECKS */
  68
  69 typedef unsigned long pte_t;
  70 typedef unsigned long pgd_t;
  71 typedef unsigned long pgprot_t;
  72 typedef unsigned long pgtable_t;
  73
  74 #define pte_val(x)      (x)
  75 #define pgd_val(x)      (x)
  76 #define pgprot_val(x)   (x)
  77 #define __pte(x)        (x)
  78 #define __pgprot(x)     (x)
  79 #define pte_pgprot(x)   (x)
  80
  81 #endif
  82
  83 #define ARCH_PFN_OFFSET     (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)
  84
  85 #define pfn_valid(pfn)      (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
  86
  87 /*
  88  * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
  89  *
  90  * These macros have historically been misnamed
  91  * virt here means link-address/program-address as embedded in object code.
  92  * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be
  93  * 128th page, and virt_to_page( ) will return the struct page corresp to it.
  94  * mem_map[ ] is an array of struct page for each page frame in the system
  95  *
  96  * Independent of where linux is linked at, link-addr = physical address
  97  * So the old macro  __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE
  98  * would have been wrong in case kernel is not at 0x8zs
  99  */
 100 #define __pa(vaddr)  ((unsigned long)vaddr)
 101 #define __va(paddr)  ((void *)((unsigned long)(paddr)))
 102
 103 #define virt_to_page(kaddr)     \
 104         (mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT))
 105
 106 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 107
 108 /* Default Permissions for page, used in mmap.c */
 109 #ifdef CONFIG_ARC_STACK_NONEXEC
 110 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)
 111 #else
 112 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 113                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 114 #endif
 115
 116 #define WANT_PAGE_VIRTUAL   1
 117
 118 #include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
 119 #include <asm-generic/getorder.h>
 120
 121 #endif /* !__ASSEMBLY__ */
 122
 123 #endif