LXR linux/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_page(to, from)             memcpy((to), (from), PAGE_SIZE)
  14
  15struct vm_area_struct;
  16struct page;
  17
  18#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  19
  20void copy_user_highpage(struct page *to, struct page *from,
  21                        unsigned long u_vaddr, struct vm_area_struct *vma);
  22void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
  23
  24#undef STRICT_MM_TYPECHECKS
  25
  26#ifdef STRICT_MM_TYPECHECKS
  27/*
  28 * These are used to make use of C type-checking..
  29 */
  30typedef struct {
  31#ifdef CONFIG_ARC_HAS_PAE40
  32        unsigned long long pte;
  33#else
  34        unsigned long pte;
  35#endif
  36} pte_t;
  37typedef struct {
  38        unsigned long pgd;
  39} pgd_t;
  40typedef struct {
  41        unsigned long pgprot;
  42} pgprot_t;
  43
  44#define pte_val(x)      ((x).pte)
  45#define pgd_val(x)      ((x).pgd)
  46#define pgprot_val(x)   ((x).pgprot)
  47
  48#define __pte(x)        ((pte_t) { (x) })
  49#define __pgd(x)        ((pgd_t) { (x) })
  50#define __pgprot(x)     ((pgprot_t) { (x) })
  51
  52#define pte_pgprot(x) __pgprot(pte_val(x))
  53
  54#else /* !STRICT_MM_TYPECHECKS */
  55
  56#ifdef CONFIG_ARC_HAS_PAE40
  57typedef unsigned long long pte_t;
  58#else
  59typedef unsigned long pte_t;
  60#endif
  61typedef unsigned long pgd_t;
  62typedef unsigned long pgprot_t;
  63
  64#define pte_val(x)      (x)
  65#define pgd_val(x)      (x)
  66#define pgprot_val(x)   (x)
  67#define __pte(x)        (x)
  68#define __pgd(x)        (x)
  69#define __pgprot(x)     (x)
  70#define pte_pgprot(x)   (x)
  71
  72#endif
  73
  74typedef pte_t * pgtable_t;
  75
  76/*
  77 * Use virt_to_pfn with caution:
  78 * If used in pte or paddr related macros, it could cause truncation
  79 * in PAE40 builds
  80 * As a rule of thumb, only use it in helpers starting with virt_
  81 * You have been warned !
  82 */
  83#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  84
  85#define ARCH_PFN_OFFSET         virt_to_pfn(CONFIG_LINUX_RAM_BASE)
  86
  87#ifdef CONFIG_FLATMEM
  88#define pfn_valid(pfn)          (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
  89#endif
  90
  91/*
  92 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
  93 *
  94 * These macros have historically been misnamed
  95 * virt here means link-address/program-address as embedded in object code.
  96 * And for ARC, link-addr = physical address
  97 */
  98#define __pa(vaddr)  ((unsigned long)(vaddr))
  99#define __va(paddr)  ((void *)((unsigned long)(paddr)))
 100
 101#define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
 102#define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
 103
 104/* Default Permissions for stack/heaps pages (Non Executable) */
 105#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 106
 107#define WANT_PAGE_VIRTUAL   1
 108
 109#include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
 110#include <asm-generic/getorder.h>
 111
 112#endif /* !__ASSEMBLY__ */
 113
 114#endif
 115