linux/arch/riscv/include/asm/page.h
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   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 */
  52typedef struct {
  53        unsigned long pgd;
  54} pgd_t;
  55
  56/* Page Table entry */
  57typedef struct {
  58        unsigned long pte;
  59} pte_t;
  60
  61typedef struct {
  62        unsigned long pgprot;
  63} pgprot_t;
  64
  65typedef 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
  82extern 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
  88struct 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
 105extern struct kernel_mapping kernel_map;
 106extern 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
 147extern phys_addr_t __virt_to_phys(unsigned long x);
 148extern 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 */
 189
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