linux/arch/riscv/include/asm/page.h
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   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
   4 * Copyright (C) 2012 Regents of the University of California
   5 * Copyright (C) 2017 SiFive
   6 * Copyright (C) 2017 XiaojingZhu <zhuxiaoj@ict.ac.cn>
   7 */
   8
   9#ifndef _ASM_RISCV_PAGE_H
  10#define _ASM_RISCV_PAGE_H
  11
  12#include <linux/pfn.h>
  13#include <linux/const.h>
  14
  15#define PAGE_SHIFT      (12)
  16#define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  17#define PAGE_MASK       (~(PAGE_SIZE - 1))
  18
  19#ifdef CONFIG_64BIT
  20#define HUGE_MAX_HSTATE         2
  21#else
  22#define HUGE_MAX_HSTATE         1
  23#endif
  24#define HPAGE_SHIFT             PMD_SHIFT
  25#define HPAGE_SIZE              (_AC(1, UL) << HPAGE_SHIFT)
  26#define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  27#define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  28
  29/*
  30 * PAGE_OFFSET -- the first address of the first page of memory.
  31 * When not using MMU this corresponds to the first free page in
  32 * physical memory (aligned on a page boundary).
  33 */
  34#define PAGE_OFFSET             _AC(CONFIG_PAGE_OFFSET, UL)
  35
  36#define KERN_VIRT_SIZE (-PAGE_OFFSET)
  37
  38#ifndef __ASSEMBLY__
  39
  40#define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
  41#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
  42
  43/* align addr on a size boundary - adjust address up/down if needed */
  44#define _ALIGN_UP(addr, size)   (((addr)+((size)-1))&(~((size)-1)))
  45#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
  46
  47/* align addr on a size boundary - adjust address up if needed */
  48#define _ALIGN(addr, size)      _ALIGN_UP(addr, size)
  49
  50#define clear_page(pgaddr)                      memset((pgaddr), 0, PAGE_SIZE)
  51#define copy_page(to, from)                     memcpy((to), (from), PAGE_SIZE)
  52
  53#define clear_user_page(pgaddr, vaddr, page)    memset((pgaddr), 0, PAGE_SIZE)
  54#define copy_user_page(vto, vfrom, vaddr, topg) \
  55                        memcpy((vto), (vfrom), PAGE_SIZE)
  56
  57/*
  58 * Use struct definitions to apply C type checking
  59 */
  60
  61/* Page Global Directory entry */
  62typedef struct {
  63        unsigned long pgd;
  64} pgd_t;
  65
  66/* Page Table entry */
  67typedef struct {
  68        unsigned long pte;
  69} pte_t;
  70
  71typedef struct {
  72        unsigned long pgprot;
  73} pgprot_t;
  74
  75typedef struct page *pgtable_t;
  76
  77#define pte_val(x)      ((x).pte)
  78#define pgd_val(x)      ((x).pgd)
  79#define pgprot_val(x)   ((x).pgprot)
  80
  81#define __pte(x)        ((pte_t) { (x) })
  82#define __pgd(x)        ((pgd_t) { (x) })
  83#define __pgprot(x)     ((pgprot_t) { (x) })
  84
  85#ifdef CONFIG_64BIT
  86#define PTE_FMT "%016lx"
  87#else
  88#define PTE_FMT "%08lx"
  89#endif
  90
  91extern unsigned long va_pa_offset;
  92extern unsigned long pfn_base;
  93
  94extern unsigned long max_low_pfn;
  95extern unsigned long min_low_pfn;
  96
  97#define __pa(x)         ((unsigned long)(x) - va_pa_offset)
  98#define __va(x)         ((void *)((unsigned long) (x) + va_pa_offset))
  99
 100#define phys_to_pfn(phys)       (PFN_DOWN(phys))
 101#define pfn_to_phys(pfn)        (PFN_PHYS(pfn))
 102
 103#define virt_to_pfn(vaddr)      (phys_to_pfn(__pa(vaddr)))
 104#define pfn_to_virt(pfn)        (__va(pfn_to_phys(pfn)))
 105
 106#define virt_to_page(vaddr)     (pfn_to_page(virt_to_pfn(vaddr)))
 107#define page_to_virt(page)      (pfn_to_virt(page_to_pfn(page)))
 108
 109#define page_to_phys(page)      (pfn_to_phys(page_to_pfn(page)))
 110#define page_to_bus(page)       (page_to_phys(page))
 111#define phys_to_page(paddr)     (pfn_to_page(phys_to_pfn(paddr)))
 112
 113#ifdef CONFIG_FLATMEM
 114#define pfn_valid(pfn) \
 115        (((pfn) >= pfn_base) && (((pfn)-pfn_base) < max_mapnr))
 116#endif
 117
 118#define ARCH_PFN_OFFSET         (pfn_base)
 119
 120#endif /* __ASSEMBLY__ */
 121
 122#define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 123
 124#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 125                                 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 126
 127#include <asm-generic/memory_model.h>
 128#include <asm-generic/getorder.h>
 129
 130#endif /* _ASM_RISCV_PAGE_H */
 131