include/asm-s390/page.h

   1 /*
   2  *  include/asm-s390/page.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Hartmut Penner (hp@de.ibm.com)
   7  */
   8
   9 #ifndef _S390_PAGE_H
  10 #define _S390_PAGE_H
  11
  12 #include <asm/setup.h>
  13 #include <asm/types.h>
  14
  15 /* PAGE_SHIFT determines the page size */
  16 #define PAGE_SHIFT      12
  17 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  18 #define PAGE_MASK       (~(PAGE_SIZE-1))
  19
  20 #ifdef __KERNEL__
  21 #ifndef __ASSEMBLY__
  22
  23 #ifndef __s390x__
  24
  25 static inline void clear_page(void *page)
  26 {
  27         register_pair rp;
  28
  29         rp.subreg.even = (unsigned long) page;
  30         rp.subreg.odd = (unsigned long) 4096;
  31         asm volatile ("   slr  1,1\n"
  32                       "   mvcl %0,0"
  33                       : "+&a" (rp) : : "memory", "cc", "1" );
  34 }
  35
  36 static inline void copy_page(void *to, void *from)
  37 {
  38         if (MACHINE_HAS_MVPG)
  39                 asm volatile ("   sr   0,0\n"
  40                               "   mvpg %0,%1"
  41                               : : "a" ((void *)(to)), "a" ((void *)(from))
  42                               : "memory", "cc", "0" );
  43         else
  44                 asm volatile ("   mvc  0(256,%0),0(%1)\n"
  45                               "   mvc  256(256,%0),256(%1)\n"
  46                               "   mvc  512(256,%0),512(%1)\n"
  47                               "   mvc  768(256,%0),768(%1)\n"
  48                               "   mvc  1024(256,%0),1024(%1)\n"
  49                               "   mvc  1280(256,%0),1280(%1)\n"
  50                               "   mvc  1536(256,%0),1536(%1)\n"
  51                               "   mvc  1792(256,%0),1792(%1)\n"
  52                               "   mvc  2048(256,%0),2048(%1)\n"
  53                               "   mvc  2304(256,%0),2304(%1)\n"
  54                               "   mvc  2560(256,%0),2560(%1)\n"
  55                               "   mvc  2816(256,%0),2816(%1)\n"
  56                               "   mvc  3072(256,%0),3072(%1)\n"
  57                               "   mvc  3328(256,%0),3328(%1)\n"
  58                               "   mvc  3584(256,%0),3584(%1)\n"
  59                               "   mvc  3840(256,%0),3840(%1)\n"
  60                               : : "a"((void *)(to)),"a"((void *)(from))
  61                               : "memory" );
  62 }
  63
  64 #else /* __s390x__ */
  65
  66 static inline void clear_page(void *page)
  67 {
  68         asm volatile ("   lgr  2,%0\n"
  69                       "   lghi 3,4096\n"
  70                       "   slgr 1,1\n"
  71                       "   mvcl 2,0"
  72                       : : "a" ((void *) (page))
  73                       : "memory", "cc", "1", "2", "3" );
  74 }
  75
  76 static inline void copy_page(void *to, void *from)
  77 {
  78         if (MACHINE_HAS_MVPG)
  79                 asm volatile ("   sgr  0,0\n"
  80                               "   mvpg %0,%1"
  81                               : : "a" ((void *)(to)), "a" ((void *)(from))
  82                               : "memory", "cc", "0" );
  83         else
  84                 asm volatile ("   mvc  0(256,%0),0(%1)\n"
  85                               "   mvc  256(256,%0),256(%1)\n"
  86                               "   mvc  512(256,%0),512(%1)\n"
  87                               "   mvc  768(256,%0),768(%1)\n"
  88                               "   mvc  1024(256,%0),1024(%1)\n"
  89                               "   mvc  1280(256,%0),1280(%1)\n"
  90                               "   mvc  1536(256,%0),1536(%1)\n"
  91                               "   mvc  1792(256,%0),1792(%1)\n"
  92                               "   mvc  2048(256,%0),2048(%1)\n"
  93                               "   mvc  2304(256,%0),2304(%1)\n"
  94                               "   mvc  2560(256,%0),2560(%1)\n"
  95                               "   mvc  2816(256,%0),2816(%1)\n"
  96                               "   mvc  3072(256,%0),3072(%1)\n"
  97                               "   mvc  3328(256,%0),3328(%1)\n"
  98                               "   mvc  3584(256,%0),3584(%1)\n"
  99                               "   mvc  3840(256,%0),3840(%1)\n"
 100                               : : "a"((void *)(to)),"a"((void *)(from))
 101                               : "memory" );
 102 }
 103
 104 #endif /* __s390x__ */
 105
 106 #define clear_user_page(page, vaddr, pg)        clear_page(page)
 107 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
 108
 109 /* Pure 2^n version of get_order */
 110 extern __inline__ int get_order(unsigned long size)
 111 {
 112         int order;
 113
 114         size = (size-1) >> (PAGE_SHIFT-1);
 115         order = -1;
 116         do {
 117                 size >>= 1;
 118                 order++;
 119         } while (size);
 120         return order;
 121 }
 122
 123 /*
 124  * These are used to make use of C type-checking..
 125  */
 126
 127 typedef struct { unsigned long pgprot; } pgprot_t;
 128 typedef struct { unsigned long pte; } pte_t;
 129
 130 #define pte_val(x)      ((x).pte)
 131 #define pgprot_val(x)   ((x).pgprot)
 132
 133 #ifndef __s390x__
 134
 135 typedef struct { unsigned long pmd; } pmd_t;
 136 typedef struct {
 137         unsigned long pgd0;
 138         unsigned long pgd1;
 139         unsigned long pgd2;
 140         unsigned long pgd3;
 141         } pgd_t;
 142
 143 #define pmd_val(x)      ((x).pmd)
 144 #define pgd_val(x)      ((x).pgd0)
 145
 146 #else /* __s390x__ */
 147
 148 typedef struct {
 149         unsigned long pmd0;
 150         unsigned long pmd1;
 151         } pmd_t;
 152 typedef struct { unsigned long pgd; } pgd_t;
 153
 154 #define pmd_val(x)      ((x).pmd0)
 155 #define pmd_val1(x)     ((x).pmd1)
 156 #define pgd_val(x)      ((x).pgd)
 157
 158 #endif /* __s390x__ */
 159
 160 #define __pte(x)        ((pte_t) { (x) } )
 161 #define __pmd(x)        ((pmd_t) { (x) } )
 162 #define __pgd(x)        ((pgd_t) { (x) } )
 163 #define __pgprot(x)     ((pgprot_t) { (x) } )
 164
 165 /* default storage key used for all pages */
 166 extern unsigned int default_storage_key;
 167
 168 static inline void
 169 page_set_storage_key(unsigned long addr, unsigned int skey)
 170 {
 171         asm volatile ( "sske %0,%1" : : "d" (skey), "a" (addr) );
 172 }
 173
 174 static inline unsigned int
 175 page_get_storage_key(unsigned long addr)
 176 {
 177         unsigned int skey;
 178
 179         asm volatile ( "iske %0,%1" : "=d" (skey) : "a" (addr), "0" (0) );
 180
 181         return skey;
 182 }
 183
 184 #endif /* !__ASSEMBLY__ */
 185
 186 /* to align the pointer to the (next) page boundary */
 187 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 188
 189 #define __PAGE_OFFSET           0x0UL
 190 #define PAGE_OFFSET             0x0UL
 191 #define __pa(x)                 (unsigned long)(x)
 192 #define __va(x)                 (void *)(unsigned long)(x)
 193 #define pfn_to_page(pfn)        (mem_map + (pfn))
 194 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 195 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 196
 197 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 198 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 199
 200 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 201                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 202
 203 #endif /* __KERNEL__ */
 204
 205 #endif /* _S390_PAGE_H */