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