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      CONFIG_PAGE_SHIFT
  16 #define PAGE_SIZE       (_AC(1, UL) << PAGE_SHIFT)
  17 #define PAGE_MASK       (~(PAGE_SIZE - 1))
  18
  19 #define HPAGE_SHIFT             PMD_SHIFT
  20 #define HPAGE_SIZE              (_AC(1, UL) << HPAGE_SHIFT)
  21 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
  22 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  23
  24 /*
  25  * PAGE_OFFSET -- the first address of the first page of memory.
  26  * When not using MMU this corresponds to the first free page in
  27  * physical memory (aligned on a page boundary).
  28  */
  29 #ifdef CONFIG_64BIT
  30 #ifdef CONFIG_MMU
  31 #define PAGE_OFFSET             kernel_map.page_offset
  32 #else
  33 #define PAGE_OFFSET             _AC(CONFIG_PAGE_OFFSET, UL)
  34 #endif
  35 /*
  36  * By default, CONFIG_PAGE_OFFSET value corresponds to SV57 address space so
  37  * define the PAGE_OFFSET value for SV48 and SV39.
  38  */
  39 #define PAGE_OFFSET_L4          _AC(0xffffaf8000000000, UL)
  40 #define PAGE_OFFSET_L3          _AC(0xffffffd600000000, UL)
  41 #else
  42 #define PAGE_OFFSET             _AC(CONFIG_PAGE_OFFSET, UL)
  43 #endif /* CONFIG_64BIT */
  44
  45 #ifndef __ASSEMBLY__
  46
  47 #ifdef CONFIG_RISCV_ISA_ZICBOZ
  48 void clear_page(void *page);
  49 #else
  50 #define clear_page(pgaddr)                      memset((pgaddr), 0, PAGE_SIZE)
  51 #endif
  52 #define copy_page(to, from)                     memcpy((to), (from), PAGE_SIZE)
  53
  54 #define clear_user_page(pgaddr, vaddr, page)    clear_page(pgaddr)
  55 #define copy_user_page(vto, vfrom, vaddr, topg) \
  56                         memcpy((vto), (vfrom), PAGE_SIZE)
  57
  58 /*
  59  * Use struct definitions to apply C type checking
  60  */
  61
  62 /* Page Global Directory entry */
  63 typedef struct {
  64         unsigned long pgd;
  65 } pgd_t;
  66
  67 /* Page Table entry */
  68 typedef struct {
  69         unsigned long pte;
  70 } pte_t;
  71
  72 typedef struct {
  73         unsigned long pgprot;
  74 } pgprot_t;
  75
  76 typedef struct page *pgtable_t;
  77
  78 #define pte_val(x)      ((x).pte)
  79 #define pgd_val(x)      ((x).pgd)
  80 #define pgprot_val(x)   ((x).pgprot)
  81
  82 #define __pte(x)        ((pte_t) { (x) })
  83 #define __pgd(x)        ((pgd_t) { (x) })
  84 #define __pgprot(x)     ((pgprot_t) { (x) })
  85
  86 #ifdef CONFIG_64BIT
  87 #define PTE_FMT "%016lx"
  88 #else
  89 #define PTE_FMT "%08lx"
  90 #endif
  91
  92 #if defined(CONFIG_64BIT) && defined(CONFIG_MMU)
  93 /*
  94  * We override this value as its generic definition uses __pa too early in
  95  * the boot process (before kernel_map.va_pa_offset is set).
  96  */
  97 #define MIN_MEMBLOCK_ADDR      0
  98 #endif
  99
 100 #ifdef CONFIG_MMU
 101 #define ARCH_PFN_OFFSET         (PFN_DOWN((unsigned long)phys_ram_base))
 102 #else
 103 #define ARCH_PFN_OFFSET         (PAGE_OFFSET >> PAGE_SHIFT)
 104 #endif /* CONFIG_MMU */
 105
 106 struct kernel_mapping {
 107         unsigned long page_offset;
 108         unsigned long virt_addr;
 109         unsigned long virt_offset;
 110         uintptr_t phys_addr;
 111         uintptr_t size;
 112         /* Offset between linear mapping virtual address and kernel load address */
 113         unsigned long va_pa_offset;
 114         /* Offset between kernel mapping virtual address and kernel load address */
 115 #ifdef CONFIG_XIP_KERNEL
 116         unsigned long va_kernel_xip_text_pa_offset;
 117         unsigned long va_kernel_xip_data_pa_offset;
 118         uintptr_t xiprom;
 119         uintptr_t xiprom_sz;
 120 #else
 121         unsigned long va_kernel_pa_offset;
 122 #endif
 123 };
 124
 125 extern struct kernel_mapping kernel_map;
 126 extern phys_addr_t phys_ram_base;
 127
 128 #define is_kernel_mapping(x)    \
 129         ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
 130
 131 #define is_linear_mapping(x)    \
 132         ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
 133
 134 #ifndef CONFIG_DEBUG_VIRTUAL
 135 #define linear_mapping_pa_to_va(x)      ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
 136 #else
 137 void *linear_mapping_pa_to_va(unsigned long x);
 138 #endif
 139
 140 #ifdef CONFIG_XIP_KERNEL
 141 #define kernel_mapping_pa_to_va(y)      ({                                      \
 142         unsigned long _y = (unsigned long)(y);                                  \
 143         (_y < phys_ram_base) ?                                                  \
 144                 (void *)(_y + kernel_map.va_kernel_xip_text_pa_offset) :        \
 145                 (void *)(_y + kernel_map.va_kernel_xip_data_pa_offset);         \
 146         })
 147 #else
 148 #define kernel_mapping_pa_to_va(y) ((void *)((unsigned long)(y) + kernel_map.va_kernel_pa_offset))
 149 #endif
 150
 151 #define __pa_to_va_nodebug(x)           linear_mapping_pa_to_va(x)
 152
 153 #ifndef CONFIG_DEBUG_VIRTUAL
 154 #define linear_mapping_va_to_pa(x)      ((unsigned long)(x) - kernel_map.va_pa_offset)
 155 #else
 156 phys_addr_t linear_mapping_va_to_pa(unsigned long x);
 157 #endif
 158
 159 #ifdef CONFIG_XIP_KERNEL
 160 #define kernel_mapping_va_to_pa(y) ({                                           \
 161         unsigned long _y = (unsigned long)(y);                                  \
 162         (_y < kernel_map.virt_addr + kernel_map.xiprom_sz) ?                    \
 163                 (_y - kernel_map.va_kernel_xip_text_pa_offset) :                \
 164                 (_y - kernel_map.va_kernel_xip_data_pa_offset);                 \
 165         })
 166 #else
 167 #define kernel_mapping_va_to_pa(y) ((unsigned long)(y) - kernel_map.va_kernel_pa_offset)
 168 #endif
 169
 170 #define __va_to_pa_nodebug(x)   ({                                              \
 171         unsigned long _x = x;                                                   \
 172         is_linear_mapping(_x) ?                                                 \
 173                 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x);      \
 174         })
 175
 176 #ifdef CONFIG_DEBUG_VIRTUAL
 177 extern phys_addr_t __virt_to_phys(unsigned long x);
 178 extern phys_addr_t __phys_addr_symbol(unsigned long x);
 179 #else
 180 #define __virt_to_phys(x)       __va_to_pa_nodebug(x)
 181 #define __phys_addr_symbol(x)   __va_to_pa_nodebug(x)
 182 #endif /* CONFIG_DEBUG_VIRTUAL */
 183
 184 #define __pa_symbol(x)  __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
 185 #define __pa(x)         __virt_to_phys((unsigned long)(x))
 186 #define __va(x)         ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
 187
 188 #define phys_to_pfn(phys)       (PFN_DOWN(phys))
 189 #define pfn_to_phys(pfn)        (PFN_PHYS(pfn))
 190
 191 #define virt_to_pfn(vaddr)      (phys_to_pfn(__pa(vaddr)))
 192 #define pfn_to_virt(pfn)        (__va(pfn_to_phys(pfn)))
 193
 194 #define virt_to_page(vaddr)     (pfn_to_page(virt_to_pfn(vaddr)))
 195 #define page_to_virt(page)      (pfn_to_virt(page_to_pfn(page)))
 196
 197 #define page_to_phys(page)      (pfn_to_phys(page_to_pfn(page)))
 198 #define phys_to_page(paddr)     (pfn_to_page(phys_to_pfn(paddr)))
 199
 200 #define sym_to_pfn(x)           __phys_to_pfn(__pa_symbol(x))
 201
 202 unsigned long kaslr_offset(void);
 203
 204 static __always_inline void *pfn_to_kaddr(unsigned long pfn)
 205 {
 206         return __va(pfn << PAGE_SHIFT);
 207 }
 208
 209 #endif /* __ASSEMBLY__ */
 210
 211 #define virt_addr_valid(vaddr)  ({                                              \
 212         unsigned long _addr = (unsigned long)vaddr;                             \
 213         (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
 214 })
 215
 216 #define VM_DATA_DEFAULT_FLAGS   VM_DATA_FLAGS_NON_EXEC
 217
 218 #include <asm-generic/memory_model.h>
 219 #include <asm-generic/getorder.h>
 220
 221 #endif /* _ASM_RISCV_PAGE_H */