arch/sh/include/asm/page.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_PAGE_H
   3 #define __ASM_SH_PAGE_H
   4
   5 /*
   6  * Copyright (C) 1999  Niibe Yutaka
   7  */
   8
   9 #include <linux/const.h>
  10
  11 #include <vdso/page.h>
  12
  13 #define PTE_MASK        PAGE_MASK
  14
  15 #if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
  16 #define HPAGE_SHIFT     16
  17 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
  18 #define HPAGE_SHIFT     18
  19 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
  20 #define HPAGE_SHIFT     20
  21 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
  22 #define HPAGE_SHIFT     22
  23 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
  24 #define HPAGE_SHIFT     26
  25 #endif
  26
  27 #ifdef CONFIG_HUGETLB_PAGE
  28 #define HPAGE_SIZE              (1UL << HPAGE_SHIFT)
  29 #define HPAGE_MASK              (~(HPAGE_SIZE-1))
  30 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT-PAGE_SHIFT)
  31 #endif
  32
  33 #ifndef __ASSEMBLY__
  34 #include <asm/uncached.h>
  35
  36 extern unsigned long shm_align_mask;
  37 extern unsigned long max_low_pfn, min_low_pfn;
  38 extern unsigned long memory_start, memory_end, memory_limit;
  39
  40 static inline unsigned long
  41 pages_do_alias(unsigned long addr1, unsigned long addr2)
  42 {
  43         return (addr1 ^ addr2) & shm_align_mask;
  44 }
  45
  46 #define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
  47 extern void copy_page(void *to, void *from);
  48 #define copy_user_page(to, from, vaddr, pg)  __copy_user(to, from, PAGE_SIZE)
  49
  50 struct page;
  51 struct vm_area_struct;
  52
  53 extern void copy_user_highpage(struct page *to, struct page *from,
  54                                unsigned long vaddr, struct vm_area_struct *vma);
  55 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
  56 extern void clear_user_highpage(struct page *page, unsigned long vaddr);
  57 #define clear_user_highpage     clear_user_highpage
  58
  59 /*
  60  * These are used to make use of C type-checking..
  61  */
  62 #ifdef CONFIG_X2TLB
  63 typedef struct { unsigned long pte_low, pte_high; } pte_t;
  64 typedef struct { unsigned long long pgprot; } pgprot_t;
  65 typedef struct { unsigned long long pgd; } pgd_t;
  66 #define pte_val(x) \
  67         ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  68 #define __pte(x) \
  69         ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
  70 #else
  71 typedef struct { unsigned long pte_low; } pte_t;
  72 typedef struct { unsigned long pgprot; } pgprot_t;
  73 typedef struct { unsigned long pgd; } pgd_t;
  74 #define pte_val(x)      ((x).pte_low)
  75 #define __pte(x)        ((pte_t) { (x) } )
  76 #endif
  77
  78 #define pgd_val(x)      ((x).pgd)
  79 #define pgprot_val(x)   ((x).pgprot)
  80
  81 #define __pgd(x) ((pgd_t) { (x) } )
  82 #define __pgprot(x)     ((pgprot_t) { (x) } )
  83
  84 typedef struct page *pgtable_t;
  85
  86 #define pte_pgprot(x) __pgprot(pte_val(x) & PTE_FLAGS_MASK)
  87
  88 #endif /* !__ASSEMBLY__ */
  89
  90 /*
  91  * __MEMORY_START and SIZE are the physical addresses and size of RAM.
  92  */
  93 #define __MEMORY_START          CONFIG_MEMORY_START
  94 #define __MEMORY_SIZE           CONFIG_MEMORY_SIZE
  95
  96 /*
  97  * PHYSICAL_OFFSET is the offset in physical memory where the base
  98  * of the kernel is loaded.
  99  */
 100 #ifdef CONFIG_PHYSICAL_START
 101 #define PHYSICAL_OFFSET (CONFIG_PHYSICAL_START - __MEMORY_START)
 102 #else
 103 #define PHYSICAL_OFFSET 0
 104 #endif
 105
 106 /*
 107  * PAGE_OFFSET is the virtual address of the start of kernel address
 108  * space.
 109  */
 110 #define PAGE_OFFSET             CONFIG_PAGE_OFFSET
 111
 112 /*
 113  * Virtual to physical RAM address translation.
 114  *
 115  * In 29 bit mode, the physical offset of RAM from address 0 is visible in
 116  * the kernel virtual address space, and thus we don't have to take
 117  * this into account when translating. However in 32 bit mode this offset
 118  * is not visible (it is part of the PMB mapping) and so needs to be
 119  * added or subtracted as required.
 120  */
 121 #ifdef CONFIG_PMB
 122 #define ___pa(x)        ((x)-PAGE_OFFSET+__MEMORY_START)
 123 #define ___va(x)        ((x)+PAGE_OFFSET-__MEMORY_START)
 124 #else
 125 #define ___pa(x)        ((x)-PAGE_OFFSET)
 126 #define ___va(x)        ((x)+PAGE_OFFSET)
 127 #endif
 128
 129 #ifndef __ASSEMBLY__
 130 #define __pa(x)         ___pa((unsigned long)x)
 131 #define __va(x)         (void *)___va((unsigned long)x)
 132 #endif /* !__ASSEMBLY__ */
 133
 134 #ifdef CONFIG_UNCACHED_MAPPING
 135 #if defined(CONFIG_29BIT)
 136 #define UNCAC_ADDR(addr)        P2SEGADDR(addr)
 137 #define CAC_ADDR(addr)          P1SEGADDR(addr)
 138 #else
 139 #define UNCAC_ADDR(addr)        ((addr) - PAGE_OFFSET + uncached_start)
 140 #define CAC_ADDR(addr)          ((addr) - uncached_start + PAGE_OFFSET)
 141 #endif
 142 #else
 143 #define UNCAC_ADDR(addr)        ((addr))
 144 #define CAC_ADDR(addr)          ((addr))
 145 #endif
 146
 147 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 148
 149 /*
 150  * PFN = physical frame number (ie PFN 0 == physical address 0)
 151  * PFN_START is the PFN of the first page of RAM. By defining this we
 152  * don't have struct page entries for the portion of address space
 153  * between physical address 0 and the start of RAM.
 154  */
 155 #define PFN_START               (__MEMORY_START >> PAGE_SHIFT)
 156 #define ARCH_PFN_OFFSET         (PFN_START)
 157 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 158 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 159
 160 #include <asm-generic/memory_model.h>
 161 #include <asm-generic/getorder.h>
 162
 163 #endif /* __ASM_SH_PAGE_H */