arch/arc/include/asm/page.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   4  */
   5 #ifndef __ASM_ARC_PAGE_H
   6 #define __ASM_ARC_PAGE_H
   7
   8 #include <uapi/asm/page.h>
   9
  10 #ifndef __ASSEMBLY__
  11
  12 #define clear_page(paddr)               memset((paddr), 0, PAGE_SIZE)
  13 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  14 #define copy_page(to, from)             memcpy((to), (from), PAGE_SIZE)
  15
  16 struct vm_area_struct;
  17 struct page;
  18
  19 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  20
  21 void copy_user_highpage(struct page *to, struct page *from,
  22                         unsigned long u_vaddr, struct vm_area_struct *vma);
  23 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
  24
  25 #undef STRICT_MM_TYPECHECKS
  26
  27 #ifdef STRICT_MM_TYPECHECKS
  28 /*
  29  * These are used to make use of C type-checking..
  30  */
  31 typedef struct {
  32 #ifdef CONFIG_ARC_HAS_PAE40
  33         unsigned long long pte;
  34 #else
  35         unsigned long pte;
  36 #endif
  37 } pte_t;
  38 typedef struct {
  39         unsigned long pgd;
  40 } pgd_t;
  41 typedef struct {
  42         unsigned long pgprot;
  43 } pgprot_t;
  44
  45 #define pte_val(x)      ((x).pte)
  46 #define pgd_val(x)      ((x).pgd)
  47 #define pgprot_val(x)   ((x).pgprot)
  48
  49 #define __pte(x)        ((pte_t) { (x) })
  50 #define __pgd(x)        ((pgd_t) { (x) })
  51 #define __pgprot(x)     ((pgprot_t) { (x) })
  52
  53 #define pte_pgprot(x) __pgprot(pte_val(x))
  54
  55 #else /* !STRICT_MM_TYPECHECKS */
  56
  57 #ifdef CONFIG_ARC_HAS_PAE40
  58 typedef unsigned long long pte_t;
  59 #else
  60 typedef unsigned long pte_t;
  61 #endif
  62 typedef unsigned long pgd_t;
  63 typedef unsigned long pgprot_t;
  64
  65 #define pte_val(x)      (x)
  66 #define pgd_val(x)      (x)
  67 #define pgprot_val(x)   (x)
  68 #define __pte(x)        (x)
  69 #define __pgd(x)        (x)
  70 #define __pgprot(x)     (x)
  71 #define pte_pgprot(x)   (x)
  72
  73 #endif
  74
  75 typedef pte_t * pgtable_t;
  76
  77 /*
  78  * Use virt_to_pfn with caution:
  79  * If used in pte or paddr related macros, it could cause truncation
  80  * in PAE40 builds
  81  * As a rule of thumb, only use it in helpers starting with virt_
  82  * You have been warned !
  83  */
  84 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  85
  86 /*
  87  * When HIGHMEM is enabled we have holes in the memory map so we need
  88  * pfn_valid() that takes into account the actual extents of the physical
  89  * memory
  90  */
  91 #ifdef CONFIG_HIGHMEM
  92
  93 extern unsigned long arch_pfn_offset;
  94 #define ARCH_PFN_OFFSET         arch_pfn_offset
  95
  96 extern int pfn_valid(unsigned long pfn);
  97 #define pfn_valid               pfn_valid
  98
  99 #else /* CONFIG_HIGHMEM */
 100
 101 #define ARCH_PFN_OFFSET         virt_to_pfn(CONFIG_LINUX_RAM_BASE)
 102 #define pfn_valid(pfn)          (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
 103
 104 #endif /* CONFIG_HIGHMEM */
 105
 106 /*
 107  * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
 108  *
 109  * These macros have historically been misnamed
 110  * virt here means link-address/program-address as embedded in object code.
 111  * And for ARC, link-addr = physical address
 112  */
 113 #define __pa(vaddr)  ((unsigned long)(vaddr))
 114 #define __va(paddr)  ((void *)((unsigned long)(paddr)))
 115
 116 #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
 117 #define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
 118
 119 /* Default Permissions for stack/heaps pages (Non Executable) */
 120 #define VM_DATA_DEFAULT_FLAGS   VM_DATA_FLAGS_NON_EXEC
 121
 122 #define WANT_PAGE_VIRTUAL   1
 123
 124 #include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
 125 #include <asm-generic/getorder.h>
 126
 127 #endif /* !__ASSEMBLY__ */
 128
 129 #endif