root/arch/riscv/include/asm/page.h

INCLUDED FROM

   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 */
  62 typedef struct {
  63         unsigned long pgd;
  64 } pgd_t;
  65 
  66 /* Page Table entry */
  67 typedef struct {
  68         unsigned long pte;
  69 } pte_t;
  70 
  71 typedef struct {
  72         unsigned long pgprot;
  73 } pgprot_t;
  74 
  75 typedef 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 
  91 extern unsigned long va_pa_offset;
  92 extern unsigned long pfn_base;
  93 
  94 extern unsigned long max_low_pfn;
  95 extern 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 */