arch/ia64/include/asm/page.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_IA64_PAGE_H
   3 #define _ASM_IA64_PAGE_H
   4 /*
   5  * Pagetable related stuff.
   6  *
   7  * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
   8  *      David Mosberger-Tang <davidm@hpl.hp.com>
   9  */
  10
  11 #include <asm/intrinsics.h>
  12 #include <asm/types.h>
  13
  14 /*
  15  * The top three bits of an IA64 address are its Region Number.
  16  * Different regions are assigned to different purposes.
  17  */
  18 #define RGN_SHIFT       (61)
  19 #define RGN_BASE(r)     (__IA64_UL_CONST(r)<<RGN_SHIFT)
  20 #define RGN_BITS        (RGN_BASE(-1))
  21
  22 #define RGN_KERNEL      7       /* Identity mapped region */
  23 #define RGN_UNCACHED    6       /* Identity mapped I/O region */
  24 #define RGN_GATE        5       /* Gate page, Kernel text, etc */
  25 #define RGN_HPAGE       4       /* For Huge TLB pages */
  26
  27 /*
  28  * PAGE_SHIFT determines the actual kernel page size.
  29  */
  30 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
  31 # define PAGE_SHIFT     12
  32 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
  33 # define PAGE_SHIFT     13
  34 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
  35 # define PAGE_SHIFT     14
  36 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
  37 # define PAGE_SHIFT     16
  38 #else
  39 # error Unsupported page size!
  40 #endif
  41
  42 #define PAGE_SIZE               (__IA64_UL_CONST(1) << PAGE_SHIFT)
  43 #define PAGE_MASK               (~(PAGE_SIZE - 1))
  44
  45 #define PERCPU_PAGE_SHIFT       18      /* log2() of max. size of per-CPU area */
  46 #define PERCPU_PAGE_SIZE        (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
  47
  48
  49 #ifdef CONFIG_HUGETLB_PAGE
  50 # define HPAGE_REGION_BASE      RGN_BASE(RGN_HPAGE)
  51 # define HPAGE_SHIFT            hpage_shift
  52 # define HPAGE_SHIFT_DEFAULT    28      /* check ia64 SDM for architecture supported size */
  53 # define HPAGE_SIZE             (__IA64_UL_CONST(1) << HPAGE_SHIFT)
  54 # define HPAGE_MASK             (~(HPAGE_SIZE - 1))
  55
  56 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
  57 #endif /* CONFIG_HUGETLB_PAGE */
  58
  59 #ifdef __ASSEMBLY__
  60 # define __pa(x)                ((x) - PAGE_OFFSET)
  61 # define __va(x)                ((x) + PAGE_OFFSET)
  62 #else /* !__ASSEMBLY */
  63 #  define STRICT_MM_TYPECHECKS
  64
  65 extern void clear_page (void *page);
  66 extern void copy_page (void *to, void *from);
  67
  68 /*
  69  * clear_user_page() and copy_user_page() can't be inline functions because
  70  * flush_dcache_page() can't be defined until later...
  71  */
  72 #define clear_user_page(addr, vaddr, page)      \
  73 do {                                            \
  74         clear_page(addr);                       \
  75         flush_dcache_page(page);                \
  76 } while (0)
  77
  78 #define copy_user_page(to, from, vaddr, page)   \
  79 do {                                            \
  80         copy_page((to), (from));                \
  81         flush_dcache_page(page);                \
  82 } while (0)
  83
  84
  85 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr)          \
  86 ({                                                                      \
  87         struct page *page = alloc_page_vma(                             \
  88                 GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr);  \
  89         if (page)                                                       \
  90                 flush_dcache_page(page);                                \
  91         page;                                                           \
  92 })
  93
  94 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  95
  96 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
  97
  98 #ifdef CONFIG_VIRTUAL_MEM_MAP
  99 extern int ia64_pfn_valid (unsigned long pfn);
 100 #else
 101 # define ia64_pfn_valid(pfn) 1
 102 #endif
 103
 104 #ifdef CONFIG_VIRTUAL_MEM_MAP
 105 extern struct page *vmem_map;
 106 #ifdef CONFIG_DISCONTIGMEM
 107 # define page_to_pfn(page)      ((unsigned long) (page - vmem_map))
 108 # define pfn_to_page(pfn)       (vmem_map + (pfn))
 109 # define __pfn_to_phys(pfn)     PFN_PHYS(pfn)
 110 #else
 111 # include <asm-generic/memory_model.h>
 112 #endif
 113 #else
 114 # include <asm-generic/memory_model.h>
 115 #endif
 116
 117 #ifdef CONFIG_FLATMEM
 118 # define pfn_valid(pfn)         (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
 119 #elif defined(CONFIG_DISCONTIGMEM)
 120 extern unsigned long min_low_pfn;
 121 extern unsigned long max_low_pfn;
 122 # define pfn_valid(pfn)         (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
 123 #endif
 124
 125 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 126 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 127 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 128
 129 typedef union ia64_va {
 130         struct {
 131                 unsigned long off : 61;         /* intra-region offset */
 132                 unsigned long reg :  3;         /* region number */
 133         } f;
 134         unsigned long l;
 135         void *p;
 136 } ia64_va;
 137
 138 /*
 139  * Note: These macros depend on the fact that PAGE_OFFSET has all
 140  * region bits set to 1 and all other bits set to zero.  They are
 141  * expressed in this way to ensure they result in a single "dep"
 142  * instruction.
 143  */
 144 #define __pa(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
 145 #define __va(x)         ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
 146
 147 #define REGION_NUMBER(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
 148 #define REGION_OFFSET(x)        ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
 149
 150 #ifdef CONFIG_HUGETLB_PAGE
 151 # define htlbpage_to_page(x)    (((unsigned long) REGION_NUMBER(x) << 61)                       \
 152                                  | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
 153 # define HUGETLB_PAGE_ORDER     (HPAGE_SHIFT - PAGE_SHIFT)
 154 extern unsigned int hpage_shift;
 155 #endif
 156
 157 static __inline__ int
 158 get_order (unsigned long size)
 159 {
 160         long double d = size - 1;
 161         long order;
 162
 163         order = ia64_getf_exp(d);
 164         order = order - PAGE_SHIFT - 0xffff + 1;
 165         if (order < 0)
 166                 order = 0;
 167         return order;
 168 }
 169
 170 #endif /* !__ASSEMBLY__ */
 171
 172 #ifdef STRICT_MM_TYPECHECKS
 173   /*
 174    * These are used to make use of C type-checking..
 175    */
 176   typedef struct { unsigned long pte; } pte_t;
 177   typedef struct { unsigned long pmd; } pmd_t;
 178 #if CONFIG_PGTABLE_LEVELS == 4
 179   typedef struct { unsigned long pud; } pud_t;
 180 #endif
 181   typedef struct { unsigned long pgd; } pgd_t;
 182   typedef struct { unsigned long pgprot; } pgprot_t;
 183   typedef struct page *pgtable_t;
 184
 185 # define pte_val(x)     ((x).pte)
 186 # define pmd_val(x)     ((x).pmd)
 187 #if CONFIG_PGTABLE_LEVELS == 4
 188 # define pud_val(x)     ((x).pud)
 189 #endif
 190 # define pgd_val(x)     ((x).pgd)
 191 # define pgprot_val(x)  ((x).pgprot)
 192
 193 # define __pte(x)       ((pte_t) { (x) } )
 194 # define __pmd(x)       ((pmd_t) { (x) } )
 195 # define __pgprot(x)    ((pgprot_t) { (x) } )
 196
 197 #else /* !STRICT_MM_TYPECHECKS */
 198   /*
 199    * .. while these make it easier on the compiler
 200    */
 201 # ifndef __ASSEMBLY__
 202     typedef unsigned long pte_t;
 203     typedef unsigned long pmd_t;
 204     typedef unsigned long pgd_t;
 205     typedef unsigned long pgprot_t;
 206     typedef struct page *pgtable_t;
 207 # endif
 208
 209 # define pte_val(x)     (x)
 210 # define pmd_val(x)     (x)
 211 # define pgd_val(x)     (x)
 212 # define pgprot_val(x)  (x)
 213
 214 # define __pte(x)       (x)
 215 # define __pgd(x)       (x)
 216 # define __pgprot(x)    (x)
 217 #endif /* !STRICT_MM_TYPECHECKS */
 218
 219 #define PAGE_OFFSET                     RGN_BASE(RGN_KERNEL)
 220
 221 #define VM_DATA_DEFAULT_FLAGS   VM_DATA_FLAGS_TSK_EXEC
 222
 223 #define GATE_ADDR               RGN_BASE(RGN_GATE)
 224
 225 /*
 226  * 0xa000000000000000+2*PERCPU_PAGE_SIZE
 227  * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page)
 228  */
 229 #define KERNEL_START             (GATE_ADDR+__IA64_UL_CONST(0x100000000))
 230 #define PERCPU_ADDR             (-PERCPU_PAGE_SIZE)
 231 #define LOAD_OFFSET             (KERNEL_START - KERNEL_TR_PAGE_SIZE)
 232
 233 #define __HAVE_ARCH_GATE_AREA   1
 234
 235 #endif /* _ASM_IA64_PAGE_H */