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 pmd; } pmd_t;
  46 typedef struct { __u32 pgd; } pgd_t;
  47 typedef struct { unsigned long pgprot; } pgprot_t;
  48
  49 #define pte_val(x)      ((x).pte)
  50 /* These do not work lvalues, so make sure we don't use them as such. */
  51 #define pmd_val(x)      ((x).pmd + 0)
  52 #define pgd_val(x)      ((x).pgd + 0)
  53 #define pgprot_val(x)   ((x).pgprot)
  54
  55 #define __pte(x)        ((pte_t) { (x) } )
  56 #define __pmd(x)        ((pmd_t) { (x) } )
  57 #define __pgd(x)        ((pgd_t) { (x) } )
  58 #define __pgprot(x)     ((pgprot_t) { (x) } )
  59
  60 #define __pmd_val_set(x,n) (x).pmd = (n)
  61 #define __pgd_val_set(x,n) (x).pgd = (n)
  62
  63 #else
  64 /*
  65  * .. while these make it easier on the compiler
  66  */
  67 typedef unsigned long pte_t;
  68 typedef         __u32 pmd_t;
  69 typedef         __u32 pgd_t;
  70 typedef unsigned long pgprot_t;
  71
  72 #define pte_val(x)      (x)
  73 #define pmd_val(x)      (x)
  74 #define pgd_val(x)      (x)
  75 #define pgprot_val(x)   (x)
  76
  77 #define __pte(x)        (x)
  78 #define __pmd(x)        (x)
  79 #define __pgd(x)        (x)
  80 #define __pgprot(x)     (x)
  81
  82 #define __pmd_val_set(x,n) (x) = (n)
  83 #define __pgd_val_set(x,n) (x) = (n)
  84
  85 #endif /* STRICT_MM_TYPECHECKS */
  86
  87 typedef struct page *pgtable_t;
  88
  89 typedef struct __physmem_range {
  90         unsigned long start_pfn;
  91         unsigned long pages;       /* PAGE_SIZE pages */
  92 } physmem_range_t;
  93
  94 extern physmem_range_t pmem_ranges[];
  95 extern int npmem_ranges;
  96
  97 #endif /* !__ASSEMBLY__ */
  98
  99 /* WARNING: The definitions below must match exactly to sizeof(pte_t)
 100  * etc
 101  */
 102 #ifdef CONFIG_64BIT
 103 #define BITS_PER_PTE_ENTRY      3
 104 #define BITS_PER_PMD_ENTRY      2
 105 #define BITS_PER_PGD_ENTRY      2
 106 #else
 107 #define BITS_PER_PTE_ENTRY      2
 108 #define BITS_PER_PMD_ENTRY      2
 109 #define BITS_PER_PGD_ENTRY      BITS_PER_PMD_ENTRY
 110 #endif
 111 #define PGD_ENTRY_SIZE  (1UL << BITS_PER_PGD_ENTRY)
 112 #define PMD_ENTRY_SIZE  (1UL << BITS_PER_PMD_ENTRY)
 113 #define PTE_ENTRY_SIZE  (1UL << BITS_PER_PTE_ENTRY)
 114
 115 #define LINUX_GATEWAY_SPACE     0
 116
 117 /* This governs the relationship between virtual and physical addresses.
 118  * If you alter it, make sure to take care of our various fixed mapping
 119  * segments in fixmap.h */
 120 #ifdef CONFIG_64BIT
 121 #define __PAGE_OFFSET_DEFAULT   (0x40000000)    /* 1GB */
 122 #else
 123 #define __PAGE_OFFSET_DEFAULT   (0x10000000)    /* 256MB */
 124 #endif
 125
 126 #if defined(BOOTLOADER)
 127 #define __PAGE_OFFSET   (0)     /* bootloader uses physical addresses */
 128 #else
 129 #define __PAGE_OFFSET   __PAGE_OFFSET_DEFAULT
 130 #endif /* BOOTLOADER */
 131
 132 #define PAGE_OFFSET             ((unsigned long)__PAGE_OFFSET)
 133
 134 /* The size of the gateway page (we leave lots of room for expansion) */
 135 #define GATEWAY_PAGE_SIZE       0x4000
 136
 137 /* The start of the actual kernel binary---used in vmlinux.lds.S
 138  * Leave some space after __PAGE_OFFSET for detecting kernel null
 139  * ptr derefs */
 140 #define KERNEL_BINARY_TEXT_START        (__PAGE_OFFSET + 0x100000)
 141
 142 /* These macros don't work for 64-bit C code -- don't allow in C at all */
 143 #ifdef __ASSEMBLY__
 144 #   define PA(x)        ((x)-__PAGE_OFFSET)
 145 #   define VA(x)        ((x)+__PAGE_OFFSET)
 146 #endif
 147 #define __pa(x)                 ((unsigned long)(x)-PAGE_OFFSET)
 148 #define __va(x)                 ((void *)((unsigned long)(x)+PAGE_OFFSET))
 149
 150 #ifndef CONFIG_DISCONTIGMEM
 151 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 152 #endif /* CONFIG_DISCONTIGMEM */
 153
 154 #ifdef CONFIG_HUGETLB_PAGE
 155 #define HPAGE_SHIFT             PMD_SHIFT /* fixed for transparent huge pages */
 156 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
 157 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
 158 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
 159
 160 #if defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 161 # define REAL_HPAGE_SHIFT       20 /* 20 = 1MB */
 162 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_1M
 163 #elif !defined(CONFIG_64BIT) && defined(CONFIG_PARISC_PAGE_SIZE_4KB)
 164 # define REAL_HPAGE_SHIFT       22 /* 22 = 4MB */
 165 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4M
 166 #else
 167 # define REAL_HPAGE_SHIFT       24 /* 24 = 16MB */
 168 # define _HUGE_PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16M
 169 #endif
 170 #endif /* CONFIG_HUGETLB_PAGE */
 171
 172 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 173
 174 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 175 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 176
 177 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 178                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 179
 180 #include <asm-generic/memory_model.h>
 181 #include <asm-generic/getorder.h>
 182 #include <asm/pdc.h>
 183
 184 #define PAGE0   ((struct zeropage *)__PAGE_OFFSET)
 185
 186 /* DEFINITION OF THE ZERO-PAGE (PAG0) */
 187 /* based on work by Jason Eckhardt (jason@equator.com) */
 188
 189 #endif /* _PARISC_PAGE_H */