LXR linux/arch/riscv/include/asm/page.h

   1/*
   2 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
   3 * Copyright (C) 2012 Regents of the University of California
   4 * Copyright (C) 2017 SiFive
   5 * Copyright (C) 2017 XiaojingZhu <zhuxiaoj@ict.ac.cn>
   6 *
   7 *   This program is free software; you can redistribute it and/or
   8 *   modify it under the terms of the GNU General Public License
   9 *   as published by the Free Software Foundation, version 2.
  10 *
  11 *   This program is distributed in the hope that it will be useful,
  12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *   GNU General Public License for more details.
  15 */
  16
  17#ifndef _ASM_RISCV_PAGE_H
  18#define _ASM_RISCV_PAGE_H
  19
  20#include <linux/pfn.h>
  21#include <linux/const.h>
  22
  23#define PAGE_SHIFT      (12)
  24#define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  25#define PAGE_MASK       (~(PAGE_SIZE - 1))
  26
  27/*
  28 * PAGE_OFFSET -- the first address of the first page of memory.
  29 * When not using MMU this corresponds to the first free page in
  30 * physical memory (aligned on a page boundary).
  31 */
  32#define PAGE_OFFSET             _AC(CONFIG_PAGE_OFFSET, UL)
  33
  34#define KERN_VIRT_SIZE (-PAGE_OFFSET)
  35
  36#ifndef __ASSEMBLY__
  37
  38#define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
  39#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
  40
  41/* align addr on a size boundary - adjust address up/down if needed */
  42#define _ALIGN_UP(addr, size)   (((addr)+((size)-1))&(~((size)-1)))
  43#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
  44
  45/* align addr on a size boundary - adjust address up if needed */
  46#define _ALIGN(addr, size)      _ALIGN_UP(addr, size)
  47
  48#define clear_page(pgaddr)                      memset((pgaddr), 0, PAGE_SIZE)
  49#define copy_page(to, from)                     memcpy((to), (from), PAGE_SIZE)
  50
  51#define clear_user_page(pgaddr, vaddr, page)    memset((pgaddr), 0, PAGE_SIZE)
  52#define copy_user_page(vto, vfrom, vaddr, topg) \
  53                        memcpy((vto), (vfrom), PAGE_SIZE)
  54
  55/*
  56 * Use struct definitions to apply C type checking
  57 */
  58
  59/* Page Global Directory entry */
  60typedef struct {
  61        unsigned long pgd;
  62} pgd_t;
  63
  64/* Page Table entry */
  65typedef struct {
  66        unsigned long pte;
  67} pte_t;
  68
  69typedef struct {
  70        unsigned long pgprot;
  71} pgprot_t;
  72
  73typedef struct page *pgtable_t;
  74
  75#define pte_val(x)      ((x).pte)
  76#define pgd_val(x)      ((x).pgd)
  77#define pgprot_val(x)   ((x).pgprot)
  78
  79#define __pte(x)        ((pte_t) { (x) })
  80#define __pgd(x)        ((pgd_t) { (x) })
  81#define __pgprot(x)     ((pgprot_t) { (x) })
  82
  83#ifdef CONFIG_64BIT
  84#define PTE_FMT "%016lx"
  85#else
  86#define PTE_FMT "%08lx"
  87#endif
  88
  89extern unsigned long va_pa_offset;
  90extern unsigned long pfn_base;
  91
  92extern unsigned long max_low_pfn;
  93extern unsigned long min_low_pfn;
  94
  95#define __pa(x)         ((unsigned long)(x) - va_pa_offset)
  96#define __va(x)         ((void *)((unsigned long) (x) + va_pa_offset))
  97
  98#define phys_to_pfn(phys)       (PFN_DOWN(phys))
  99#define pfn_to_phys(pfn)        (PFN_PHYS(pfn))
 100
 101#define virt_to_pfn(vaddr)      (phys_to_pfn(__pa(vaddr)))
 102#define pfn_to_virt(pfn)        (__va(pfn_to_phys(pfn)))
 103
 104#define virt_to_page(vaddr)     (pfn_to_page(virt_to_pfn(vaddr)))
 105#define page_to_virt(page)      (pfn_to_virt(page_to_pfn(page)))
 106
 107#define page_to_phys(page)      (pfn_to_phys(page_to_pfn(page)))
 108#define page_to_bus(page)       (page_to_phys(page))
 109#define phys_to_page(paddr)     (pfn_to_page(phys_to_pfn(paddr)))
 110
 111#define pfn_valid(pfn) \
 112        (((pfn) >= pfn_base) && (((pfn)-pfn_base) < max_mapnr))
 113
 114#define ARCH_PFN_OFFSET         (pfn_base)
 115
 116#endif /* __ASSEMBLY__ */
 117
 118#define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 119
 120#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 121                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 122
 123#include <asm-generic/memory_model.h>
 124#include <asm-generic/getorder.h>
 125
 126/* vDSO support */
 127/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
 128#define __HAVE_ARCH_GATE_AREA
 129
 130#endif /* _ASM_RISCV_PAGE_H */
 131