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#ifdef CONFIG_ARC_HAS_PAE40
  11
  12#define MAX_POSSIBLE_PHYSMEM_BITS       40
  13#define PAGE_MASK_PHYS                  (0xff00000000ull | PAGE_MASK)
  14
  15#else /* CONFIG_ARC_HAS_PAE40 */
  16
  17#define MAX_POSSIBLE_PHYSMEM_BITS       32
  18#define PAGE_MASK_PHYS                  PAGE_MASK
  19
  20#endif /* CONFIG_ARC_HAS_PAE40 */
  21
  22#ifndef __ASSEMBLY__
  23
  24#define clear_page(paddr)               memset((paddr), 0, PAGE_SIZE)
  25#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  26#define copy_page(to, from)             memcpy((to), (from), PAGE_SIZE)
  27
  28struct vm_area_struct;
  29struct page;
  30
  31#define __HAVE_ARCH_COPY_USER_HIGHPAGE
  32
  33void copy_user_highpage(struct page *to, struct page *from,
  34                        unsigned long u_vaddr, struct vm_area_struct *vma);
  35void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
  36
  37typedef struct {
  38        unsigned long pgd;
  39} pgd_t;
  40
  41#define pgd_val(x)      ((x).pgd)
  42#define __pgd(x)        ((pgd_t) { (x) })
  43
  44#if CONFIG_PGTABLE_LEVELS > 3
  45
  46typedef struct {
  47        unsigned long pud;
  48} pud_t;
  49
  50#define pud_val(x)              ((x).pud)
  51#define __pud(x)                ((pud_t) { (x) })
  52
  53#endif
  54
  55#if CONFIG_PGTABLE_LEVELS > 2
  56
  57typedef struct {
  58        unsigned long pmd;
  59} pmd_t;
  60
  61#define pmd_val(x)      ((x).pmd)
  62#define __pmd(x)        ((pmd_t) { (x) })
  63
  64#endif
  65
  66typedef struct {
  67#ifdef CONFIG_ARC_HAS_PAE40
  68        unsigned long long pte;
  69#else
  70        unsigned long pte;
  71#endif
  72} pte_t;
  73
  74#define pte_val(x)      ((x).pte)
  75#define __pte(x)        ((pte_t) { (x) })
  76
  77typedef struct {
  78        unsigned long pgprot;
  79} pgprot_t;
  80
  81#define pgprot_val(x)   ((x).pgprot)
  82#define __pgprot(x)     ((pgprot_t) { (x) })
  83#define pte_pgprot(x)   __pgprot(pte_val(x))
  84
  85typedef struct page *pgtable_t;
  86
  87/*
  88 * Use virt_to_pfn with caution:
  89 * If used in pte or paddr related macros, it could cause truncation
  90 * in PAE40 builds
  91 * As a rule of thumb, only use it in helpers starting with virt_
  92 * You have been warned !
  93 */
  94#define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
  95
  96/*
  97 * When HIGHMEM is enabled we have holes in the memory map so we need
  98 * pfn_valid() that takes into account the actual extents of the physical
  99 * memory
 100 */
 101#ifdef CONFIG_HIGHMEM
 102
 103extern unsigned long arch_pfn_offset;
 104#define ARCH_PFN_OFFSET         arch_pfn_offset
 105
 106extern int pfn_valid(unsigned long pfn);
 107#define pfn_valid               pfn_valid
 108
 109#else /* CONFIG_HIGHMEM */
 110
 111#define ARCH_PFN_OFFSET         virt_to_pfn(CONFIG_LINUX_RAM_BASE)
 112#define pfn_valid(pfn)          (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
 113
 114#endif /* CONFIG_HIGHMEM */
 115
 116/*
 117 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
 118 *
 119 * These macros have historically been misnamed
 120 * virt here means link-address/program-address as embedded in object code.
 121 * And for ARC, link-addr = physical address
 122 */
 123#define __pa(vaddr)             ((unsigned long)(vaddr))
 124#define __va(paddr)             ((void *)((unsigned long)(paddr)))
 125
 126#define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
 127#define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
 128
 129/* Default Permissions for stack/heaps pages (Non Executable) */
 130#define VM_DATA_DEFAULT_FLAGS   VM_DATA_FLAGS_NON_EXEC
 131
 132#define WANT_PAGE_VIRTUAL   1
 133
 134#include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
 135#include <asm-generic/getorder.h>
 136
 137#endif /* !__ASSEMBLY__ */
 138
 139#endif
 140