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 /* TBD: for now don't worry about VIPT D$ aliasing */
  20 #define clear_page(paddr)               memset((paddr), 0, PAGE_SIZE)
  21 #define copy_page(to, from)             memcpy((to), (from), PAGE_SIZE)
  22
  23 #define clear_user_page(addr, vaddr, pg)        clear_page(addr)
  24 #define copy_user_page(vto, vfrom, vaddr, pg)   copy_page(vto, vfrom)
  25
  26 #undef STRICT_MM_TYPECHECKS
  27
  28 #ifdef STRICT_MM_TYPECHECKS
  29 /*
  30  * These are used to make use of C type-checking..
  31  */
  32 typedef struct {
  33         unsigned long pte;
  34 } pte_t;
  35 typedef struct {
  36         unsigned long pgd;
  37 } pgd_t;
  38 typedef struct {
  39         unsigned long pgprot;
  40 } pgprot_t;
  41 typedef unsigned long pgtable_t;
  42
  43 #define pte_val(x)      ((x).pte)
  44 #define pgd_val(x)      ((x).pgd)
  45 #define pgprot_val(x)   ((x).pgprot)
  46
  47 #define __pte(x)        ((pte_t) { (x) })
  48 #define __pgd(x)        ((pgd_t) { (x) })
  49 #define __pgprot(x)     ((pgprot_t) { (x) })
  50
  51 #define pte_pgprot(x) __pgprot(pte_val(x))
  52
  53 #else /* !STRICT_MM_TYPECHECKS */
  54
  55 typedef unsigned long pte_t;
  56 typedef unsigned long pgd_t;
  57 typedef unsigned long pgprot_t;
  58 typedef unsigned long pgtable_t;
  59
  60 #define pte_val(x)      (x)
  61 #define pgd_val(x)      (x)
  62 #define pgprot_val(x)   (x)
  63 #define __pte(x)        (x)
  64 #define __pgprot(x)     (x)
  65 #define pte_pgprot(x)   (x)
  66
  67 #endif
  68
  69 #define ARCH_PFN_OFFSET     (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)
  70
  71 #define pfn_valid(pfn)      (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
  72
  73 /*
  74  * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
  75  *
  76  * These macros have historically been misnamed
  77  * virt here means link-address/program-address as embedded in object code.
  78  * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be
  79  * 128th page, and virt_to_page( ) will return the struct page corresp to it.
  80  * mem_map[ ] is an array of struct page for each page frame in the system
  81  *
  82  * Independent of where linux is linked at, link-addr = physical address
  83  * So the old macro  __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE
  84  * would have been wrong in case kernel is not at 0x8zs
  85  */
  86 #define __pa(vaddr)  ((unsigned long)vaddr)
  87 #define __va(paddr)  ((void *)((unsigned long)(paddr)))
  88
  89 #define virt_to_page(kaddr)     \
  90         (mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT))
  91
  92 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  93
  94 /* Default Permissions for page, used in mmap.c */
  95 #ifdef CONFIG_ARC_STACK_NONEXEC
  96 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)
  97 #else
  98 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
  99                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 100 #endif
 101
 102 #define WANT_PAGE_VIRTUAL   1
 103
 104 #include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
 105 #include <asm-generic/getorder.h>
 106
 107 #endif /* !__ASSEMBLY__ */
 108
 109 #endif