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