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 #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 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 #ifdef CONFIG_MMU
  82 extern unsigned long pfn_base;
  83 #define ARCH_PFN_OFFSET         (pfn_base)
  84 #else
  85 #define ARCH_PFN_OFFSET         (PAGE_OFFSET >> PAGE_SHIFT)
  86 #endif /* CONFIG_MMU */
  87
  88 struct kernel_mapping {
  89         unsigned long virt_addr;
  90         uintptr_t phys_addr;
  91         uintptr_t size;
  92         /* Offset between linear mapping virtual address and kernel load address */
  93         unsigned long va_pa_offset;
  94 #ifdef CONFIG_64BIT
  95         /* Offset between kernel mapping virtual address and kernel load address */
  96         unsigned long va_kernel_pa_offset;
  97 #endif
  98         unsigned long va_kernel_xip_pa_offset;
  99 #ifdef CONFIG_XIP_KERNEL
 100         uintptr_t xiprom;
 101         uintptr_t xiprom_sz;
 102 #endif
 103 };
 104
 105 extern struct kernel_mapping kernel_map;
 106 extern phys_addr_t phys_ram_base;
 107
 108 #ifdef CONFIG_64BIT
 109 #define is_kernel_mapping(x)    \
 110         ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
 111 #define is_linear_mapping(x)    \
 112         ((x) >= PAGE_OFFSET && (x) < kernel_map.virt_addr)
 113
 114 #define linear_mapping_pa_to_va(x)      ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
 115 #define kernel_mapping_pa_to_va(y)      ({                                              \
 116         unsigned long _y = y;                                                           \
 117         (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < phys_ram_base) ?                                 \
 118                 (void *)((unsigned long)(_y) + kernel_map.va_kernel_xip_pa_offset) :            \
 119                 (void *)((unsigned long)(_y) + kernel_map.va_kernel_pa_offset + XIP_OFFSET);    \
 120         })
 121 #define __pa_to_va_nodebug(x)           linear_mapping_pa_to_va(x)
 122
 123 #define linear_mapping_va_to_pa(x)      ((unsigned long)(x) - kernel_map.va_pa_offset)
 124 #define kernel_mapping_va_to_pa(y) ({                                           \
 125         unsigned long _y = y;                                                   \
 126         (_y < kernel_map.virt_addr + XIP_OFFSET) ?                                      \
 127                 ((unsigned long)(_y) - kernel_map.va_kernel_xip_pa_offset) :            \
 128                 ((unsigned long)(_y) - kernel_map.va_kernel_pa_offset - XIP_OFFSET);    \
 129         })
 130
 131 #define __va_to_pa_nodebug(x)   ({                                              \
 132         unsigned long _x = x;                                                   \
 133         is_linear_mapping(_x) ?                                                 \
 134                 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x);      \
 135         })
 136 #else
 137 #define is_kernel_mapping(x)    \
 138         ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
 139 #define is_linear_mapping(x)    \
 140         ((x) >= PAGE_OFFSET)
 141
 142 #define __pa_to_va_nodebug(x)  ((void *)((unsigned long) (x) + kernel_map.va_pa_offset))
 143 #define __va_to_pa_nodebug(x)  ((unsigned long)(x) - kernel_map.va_pa_offset)
 144 #endif /* CONFIG_64BIT */
 145
 146 #ifdef CONFIG_DEBUG_VIRTUAL
 147 extern phys_addr_t __virt_to_phys(unsigned long x);
 148 extern phys_addr_t __phys_addr_symbol(unsigned long x);
 149 #else
 150 #define __virt_to_phys(x)       __va_to_pa_nodebug(x)
 151 #define __phys_addr_symbol(x)   __va_to_pa_nodebug(x)
 152 #endif /* CONFIG_DEBUG_VIRTUAL */
 153
 154 #define __pa_symbol(x)  __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
 155 #define __pa(x)         __virt_to_phys((unsigned long)(x))
 156 #define __va(x)         ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
 157
 158 #define phys_to_pfn(phys)       (PFN_DOWN(phys))
 159 #define pfn_to_phys(pfn)        (PFN_PHYS(pfn))
 160
 161 #define virt_to_pfn(vaddr)      (phys_to_pfn(__pa(vaddr)))
 162 #define pfn_to_virt(pfn)        (__va(pfn_to_phys(pfn)))
 163
 164 #define virt_to_page(vaddr)     (pfn_to_page(virt_to_pfn(vaddr)))
 165 #define page_to_virt(page)      (pfn_to_virt(page_to_pfn(page)))
 166
 167 #define page_to_phys(page)      (pfn_to_phys(page_to_pfn(page)))
 168 #define page_to_bus(page)       (page_to_phys(page))
 169 #define phys_to_page(paddr)     (pfn_to_page(phys_to_pfn(paddr)))
 170
 171 #ifdef CONFIG_FLATMEM
 172 #define pfn_valid(pfn) \
 173         (((pfn) >= ARCH_PFN_OFFSET) && (((pfn) - ARCH_PFN_OFFSET) < max_mapnr))
 174 #endif
 175
 176 #endif /* __ASSEMBLY__ */
 177
 178 #define virt_addr_valid(vaddr)  ({                                              \
 179         unsigned long _addr = (unsigned long)vaddr;                             \
 180         (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
 181 })
 182
 183 #define VM_DATA_DEFAULT_FLAGS   VM_DATA_FLAGS_NON_EXEC
 184
 185 #include <asm-generic/memory_model.h>
 186 #include <asm-generic/getorder.h>
 187
 188 #endif /* _ASM_RISCV_PAGE_H */