arch/parisc/include/asm/page.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _PARISC_PAGE_H
   3 #define _PARISC_PAGE_H
   4
   5 #include <linux/const.h>
   6
   7 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
   8 # define PAGE_SHIFT     12
   9 #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
  10 # define PAGE_SHIFT     14
  11 #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
  12 # define PAGE_SHIFT     16
  13 #else
  14 # error "unknown default kernel page size"
  15 #endif
  16 #define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  17 #define PAGE_MASK       (~(PAGE_SIZE-1))
  18
  19
  20 #ifndef __ASSEMBLY__
  21
  22 #include <asm/types.h>
  23 #include <asm/cache.h>
  24
  25 #define clear_page(page)        clear_page_asm((void *)(page))
  26 #define copy_page(to, from)     copy_page_asm((void *)(to), (void *)(from))
  27
  28 struct page;
  29
  30 void clear_page_asm(void *page);
  31 void copy_page_asm(void *to, void *from);
  32 #define clear_user_page(vto, vaddr, page) clear_page_asm(vto)
  33 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
  34                         struct page *pg);
  35
  36 /*
  37  * These are used to make use of C type-checking..
  38  */
  39 #define STRICT_MM_TYPECHECKS
  40 #ifdef STRICT_MM_TYPECHECKS
  41 typedef struct { unsigned long pte; } pte_t; /* either 32 or 64bit */
  42
  43 /* NOTE: even on 64 bits, these entries are __u32 because we allocate
  44  * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
  45 typedef struct { __u32 pgd; } pgd_t;
  46 typedef struct { unsigned long pgprot; } pgprot_t;
  47
  48 #if CONFIG_PGTABLE_LEVELS == 3
  49 typedef struct { __u32 pmd; } pmd_t;
  50 #define __pmd(x)        ((pmd_t) { (x) } )
  51 /* pXd_val() do not work as lvalues, so make sure we don't use them as such. */
  52 #define pmd_val(x)      ((x).pmd + 0)
  53 #endif
  54
  55 #define pte_val(x)      ((x).pte)
  56 #define pgd_val(x)      ((x).pgd + 0)
  57 #define pgprot_val(x)   ((x).pgprot)
  58
  59 #define __pte(x)        ((pte_t) { (x) } )
  60 #define __pgd(x)        ((pgd_t) { (x) } )
  61 #define __pgprot(x)     ((pgprot_t) { (x) } )
  62
  63 #else
  64 /*
  65  * .. while these make it easier on the compiler
  66  */
  67 typedef unsigned long pte_t;
  68
  69 #if CONFIG_PGTABLE_LEVELS == 3
  70 typedef         __u32 pmd_t;
  71 #define pmd_val(x)      (x)
  72 #define __pmd(x)        (x)
  73 #endif
  74
  75 typedef         __u32 pgd_t;
  76 typedef unsigned long pgprot_t;
  77
  78 #define pte_val(x)      (x)
  79 #define pgd_val(x)      (x)
  80 #define pgprot_val(x)   (x)
  81
  82 #define __pte(x)        (x)
  83 #define __pgd(x)        (x)
  84 #define __pgprot(x)     (x)
  85
  86 #endif /* STRICT_MM_TYPECHECKS */
  87
  88 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
  89 #if CONFIG_PGTABLE_LEVELS == 3
  90 #define set_pud(pudptr, pudval) (*(pudptr) = (pudval))
  91 #endif
  92
  93 typedef struct page *pgtable_t;
  94
  95 typedef struct __physmem_range {
  96         unsigned long start_pfn;
  97         unsigned long pages;       /* PAGE_SIZE pages */
  98 } physmem_range_t;
  99
 100 extern physmem_range_t pmem_ranges[];
 101 extern int npmem_ranges;
 102
 103 #endif /* !__ASSEMBLY__ */
 104
 105 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
 106  * etc
 107  */
 108 #ifdef CONFIG_64BIT
 109 #define BITS_PER_PTE_ENTRY      3
 110 #define BITS_PER_PMD_ENTRY      2
 111 #define BITS_PER_PGD_ENTRY      2
 112 #else
 113 #define BITS_PER_PTE_ENTRY      2
 114 #define BITS_PER_PMD_ENTRY      2
 115 #define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 116 #endif
 117 #define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 118 #define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 119 #define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 120
 121 #define LINUX_GATEWAY_SPACE     0
 122
 123 /* This governs the relationship between virtual and physical addresses.
 124  * If you alter it, make sure to take care of our various fixed mapping
 125  * segments in fixmap.h */
 126 #ifdef CONFIG_64BIT
 127 #define __PAGE_OFFSET_DEFAULT   (0x40000000)    /* 1GB */
 128 #else
 129 #define __PAGE_OFFSET_DEFAULT   (0x10000000)    /* 256MB */
 130 #endif
 131
 132 #if defined(BOOTLOADER)
 133 #define __PAGE_OFFSET   (0)     /* bootloader uses physical addresses */
 134 #else
 135 #define __PAGE_OFFSET   __PAGE_OFFSET_DEFAULT
 136 #endif /* BOOTLOADER */
 137
 138 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 139
 140 /* The size of the gateway page (we leave lots of room for expansion) */
 141 #define GATEWAY_PAGE_SIZE       0x4000
 142
 143 /* The start of the actual kernel binary---used in vmlinux.lds.S
 144  * Leave some space after __PAGE_OFFSET for detecting kernel null
 145  * ptr derefs */
 146 #define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 147
 148 /* These macros don't work for 64-bit C code -- don't allow in C at all */
 149 #ifdef __ASSEMBLY__
 150 #   define PA(x)        ((x)-__PAGE_OFFSET)
 151 #   define VA(x)        ((x)+__PAGE_OFFSET)
 152 #endif
 153 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 154 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 155
 156 #ifndef CONFIG_SPARSEMEM
 157 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 158 #endif
 159
 160 #ifdef CONFIG_HUGETLB_PAGE
 161 #define HPAGE_SHIFT             PMD_SHIFT /* fixed for transparent huge pages */
 162 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 163 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 164 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 165
 166 #if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 167 # define REAL_HPAGE_SHIFT       20 /* 20 = 1MB */
 168 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
 169 #elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 170 # define REAL_HPAGE_SHIFT       22 /* 22 = 4MB */
 171 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
 172 #else
 173 # define REAL_HPAGE_SHIFT       24 /* 24 = 16MB */
 174 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
 175 #endif
 176 #endif /* CONFIG_HUGETLB_PAGE */
 177
 178 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 179
 180 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 181 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 182
 183 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 184                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 185
 186 #include <asm-generic/memory_model.h>
 187 #include <asm-generic/getorder.h>
 188 #include <asm/pdc.h>
 189
 190 #define PAGE0   ((struct zeropage *)__PAGE_OFFSET)
 191
 192 /* DEFINITION OF THE ZERO-PAGE (PAG0) */
 193 /* based on work by Jason Eckhardt (jason@equator.com) */
 194
 195 #endif /* _PARISC_PAGE_H */