arch/riscv/include/asm/page.h

   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 /*
  20  * PAGE_OFFSET -- the first address of the first page of memory.
  21  * When not using MMU this corresponds to the first free page in
  22  * physical memory (aligned on a page boundary).
  23  */
  24 #define PAGE_OFFSET             _AC(CONFIG_PAGE_OFFSET, UL)
  25
  26 #define KERN_VIRT_SIZE (-PAGE_OFFSET)
  27
  28 #ifndef __ASSEMBLY__
  29
  30 #define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
  31 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
  32
  33 /* align addr on a size boundary - adjust address up/down if needed */
  34 #define _ALIGN_UP(addr, size)   (((addr)+((size)-1))&(~((size)-1)))
  35 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
  36
  37 /* align addr on a size boundary - adjust address up if needed */
  38 #define _ALIGN(addr, size)      _ALIGN_UP(addr, size)
  39
  40 #define clear_page(pgaddr)                      memset((pgaddr), 0, PAGE_SIZE)
  41 #define copy_page(to, from)                     memcpy((to), (from), PAGE_SIZE)
  42
  43 #define clear_user_page(pgaddr, vaddr, page)    memset((pgaddr), 0, PAGE_SIZE)
  44 #define copy_user_page(vto, vfrom, vaddr, topg) \
  45                         memcpy((vto), (vfrom), PAGE_SIZE)
  46
  47 /*
  48  * Use struct definitions to apply C type checking
  49  */
  50
  51 /* Page Global Directory entry */
  52 typedef struct {
  53         unsigned long pgd;
  54 } pgd_t;
  55
  56 /* Page Table entry */
  57 typedef struct {
  58         unsigned long pte;
  59 } pte_t;
  60
  61 typedef struct {
  62         unsigned long pgprot;
  63 } pgprot_t;
  64
  65 typedef struct page *pgtable_t;
  66
  67 #define pte_val(x)      ((x).pte)
  68 #define pgd_val(x)      ((x).pgd)
  69 #define pgprot_val(x)   ((x).pgprot)
  70
  71 #define __pte(x)        ((pte_t) { (x) })
  72 #define __pgd(x)        ((pgd_t) { (x) })
  73 #define __pgprot(x)     ((pgprot_t) { (x) })
  74
  75 #ifdef CONFIG_64BIT
  76 #define PTE_FMT "%016lx"
  77 #else
  78 #define PTE_FMT "%08lx"
  79 #endif
  80
  81 extern unsigned long va_pa_offset;
  82 extern unsigned long pfn_base;
  83
  84 extern unsigned long max_low_pfn;
  85 extern unsigned long min_low_pfn;
  86
  87 #define __pa(x)         ((unsigned long)(x) - va_pa_offset)
  88 #define __va(x)         ((void *)((unsigned long) (x) + va_pa_offset))
  89
  90 #define phys_to_pfn(phys)       (PFN_DOWN(phys))
  91 #define pfn_to_phys(pfn)        (PFN_PHYS(pfn))
  92
  93 #define virt_to_pfn(vaddr)      (phys_to_pfn(__pa(vaddr)))
  94 #define pfn_to_virt(pfn)        (__va(pfn_to_phys(pfn)))
  95
  96 #define virt_to_page(vaddr)     (pfn_to_page(virt_to_pfn(vaddr)))
  97 #define page_to_virt(page)      (pfn_to_virt(page_to_pfn(page)))
  98
  99 #define page_to_phys(page)      (pfn_to_phys(page_to_pfn(page)))
 100 #define page_to_bus(page)       (page_to_phys(page))
 101 #define phys_to_page(paddr)     (pfn_to_page(phys_to_pfn(paddr)))
 102
 103 #define pfn_valid(pfn) \
 104         (((pfn) >= pfn_base) && (((pfn)-pfn_base) < max_mapnr))
 105
 106 #define ARCH_PFN_OFFSET         (pfn_base)
 107
 108 #endif /* __ASSEMBLY__ */
 109
 110 #define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 111
 112 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 113                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 114
 115 #include <asm-generic/memory_model.h>
 116 #include <asm-generic/getorder.h>
 117
 118 /* vDSO support */
 119 /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
 120 #define __HAVE_ARCH_GATE_AREA
 121
 122 #endif /* _ASM_RISCV_PAGE_H */