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 #define PAGE_DEFAULT_ACC        0
  20 #define PAGE_DEFAULT_KEY        (PAGE_DEFAULT_ACC << 4)
  21
  22 #ifdef __KERNEL__
  23 #ifndef __ASSEMBLY__
  24
  25 #ifndef __s390x__
  26
  27 static inline void clear_page(void *page)
  28 {
  29         register_pair rp;
  30
  31         rp.subreg.even = (unsigned long) page;
  32         rp.subreg.odd = (unsigned long) 4096;
  33         asm volatile ("   slr  1,1\n"
  34                       "   mvcl %0,0"
  35                       : "+&a" (rp) : : "memory", "cc", "1" );
  36 }
  37
  38 static inline void copy_page(void *to, void *from)
  39 {
  40         if (MACHINE_HAS_MVPG)
  41                 asm volatile ("   sr   0,0\n"
  42                               "   mvpg %0,%1"
  43                               : : "a" ((void *)(to)), "a" ((void *)(from))
  44                               : "memory", "cc", "0" );
  45         else
  46                 asm volatile ("   mvc  0(256,%0),0(%1)\n"
  47                               "   mvc  256(256,%0),256(%1)\n"
  48                               "   mvc  512(256,%0),512(%1)\n"
  49                               "   mvc  768(256,%0),768(%1)\n"
  50                               "   mvc  1024(256,%0),1024(%1)\n"
  51                               "   mvc  1280(256,%0),1280(%1)\n"
  52                               "   mvc  1536(256,%0),1536(%1)\n"
  53                               "   mvc  1792(256,%0),1792(%1)\n"
  54                               "   mvc  2048(256,%0),2048(%1)\n"
  55                               "   mvc  2304(256,%0),2304(%1)\n"
  56                               "   mvc  2560(256,%0),2560(%1)\n"
  57                               "   mvc  2816(256,%0),2816(%1)\n"
  58                               "   mvc  3072(256,%0),3072(%1)\n"
  59                               "   mvc  3328(256,%0),3328(%1)\n"
  60                               "   mvc  3584(256,%0),3584(%1)\n"
  61                               "   mvc  3840(256,%0),3840(%1)\n"
  62                               : : "a"((void *)(to)),"a"((void *)(from))
  63                               : "memory" );
  64 }
  65
  66 #else /* __s390x__ */
  67
  68 static inline void clear_page(void *page)
  69 {
  70         asm volatile ("   lgr  2,%0\n"
  71                       "   lghi 3,4096\n"
  72                       "   slgr 1,1\n"
  73                       "   mvcl 2,0"
  74                       : : "a" ((void *) (page))
  75                       : "memory", "cc", "1", "2", "3" );
  76 }
  77
  78 static inline void copy_page(void *to, void *from)
  79 {
  80         if (MACHINE_HAS_MVPG)
  81                 asm volatile ("   sgr  0,0\n"
  82                               "   mvpg %0,%1"
  83                               : : "a" ((void *)(to)), "a" ((void *)(from))
  84                               : "memory", "cc", "0" );
  85         else
  86                 asm volatile ("   mvc  0(256,%0),0(%1)\n"
  87                               "   mvc  256(256,%0),256(%1)\n"
  88                               "   mvc  512(256,%0),512(%1)\n"
  89                               "   mvc  768(256,%0),768(%1)\n"
  90                               "   mvc  1024(256,%0),1024(%1)\n"
  91                               "   mvc  1280(256,%0),1280(%1)\n"
  92                               "   mvc  1536(256,%0),1536(%1)\n"
  93                               "   mvc  1792(256,%0),1792(%1)\n"
  94                               "   mvc  2048(256,%0),2048(%1)\n"
  95                               "   mvc  2304(256,%0),2304(%1)\n"
  96                               "   mvc  2560(256,%0),2560(%1)\n"
  97                               "   mvc  2816(256,%0),2816(%1)\n"
  98                               "   mvc  3072(256,%0),3072(%1)\n"
  99                               "   mvc  3328(256,%0),3328(%1)\n"
 100                               "   mvc  3584(256,%0),3584(%1)\n"
 101                               "   mvc  3840(256,%0),3840(%1)\n"
 102                               : : "a"((void *)(to)),"a"((void *)(from))
 103                               : "memory" );
 104 }
 105
 106 #endif /* __s390x__ */
 107
 108 #define clear_user_page(page, vaddr, pg)        clear_page(page)
 109 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
 110
 111 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
 112 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
 113
 114 /* Pure 2^n version of get_order */
 115 extern __inline__ int get_order(unsigned long size)
 116 {
 117         int order;
 118
 119         size = (size-1) >> (PAGE_SHIFT-1);
 120         order = -1;
 121         do {
 122                 size >>= 1;
 123                 order++;
 124         } while (size);
 125         return order;
 126 }
 127
 128 /*
 129  * These are used to make use of C type-checking..
 130  */
 131
 132 typedef struct { unsigned long pgprot; } pgprot_t;
 133 typedef struct { unsigned long pte; } pte_t;
 134
 135 #define pte_val(x)      ((x).pte)
 136 #define pgprot_val(x)   ((x).pgprot)
 137
 138 #ifndef __s390x__
 139
 140 typedef struct { unsigned long pmd; } pmd_t;
 141 typedef struct {
 142         unsigned long pgd0;
 143         unsigned long pgd1;
 144         unsigned long pgd2;
 145         unsigned long pgd3;
 146         } pgd_t;
 147
 148 #define pmd_val(x)      ((x).pmd)
 149 #define pgd_val(x)      ((x).pgd0)
 150
 151 #else /* __s390x__ */
 152
 153 typedef struct {
 154         unsigned long pmd0;
 155         unsigned long pmd1;
 156         } pmd_t;
 157 typedef struct { unsigned long pgd; } pgd_t;
 158
 159 #define pmd_val(x)      ((x).pmd0)
 160 #define pmd_val1(x)     ((x).pmd1)
 161 #define pgd_val(x)      ((x).pgd)
 162
 163 #endif /* __s390x__ */
 164
 165 #define __pte(x)        ((pte_t) { (x) } )
 166 #define __pmd(x)        ((pmd_t) { (x) } )
 167 #define __pgd(x)        ((pgd_t) { (x) } )
 168 #define __pgprot(x)     ((pgprot_t) { (x) } )
 169
 170 /* default storage key used for all pages */
 171 extern unsigned int default_storage_key;
 172
 173 static inline void
 174 page_set_storage_key(unsigned long addr, unsigned int skey)
 175 {
 176         asm volatile ( "sske %0,%1" : : "d" (skey), "a" (addr) );
 177 }
 178
 179 static inline unsigned int
 180 page_get_storage_key(unsigned long addr)
 181 {
 182         unsigned int skey;
 183
 184         asm volatile ( "iske %0,%1" : "=d" (skey) : "a" (addr), "0" (0) );
 185
 186         return skey;
 187 }
 188
 189 #endif /* !__ASSEMBLY__ */
 190
 191 /* to align the pointer to the (next) page boundary */
 192 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 193
 194 #define __PAGE_OFFSET           0x0UL
 195 #define PAGE_OFFSET             0x0UL
 196 #define __pa(x)                 (unsigned long)(x)
 197 #define __va(x)                 (void *)(unsigned long)(x)
 198 #define pfn_to_page(pfn)        (mem_map + (pfn))
 199 #define page_to_pfn(page)       ((unsigned long)((page) - mem_map))
 200 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 201
 202 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 203 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 204
 205 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 206                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 207
 208 #endif /* __KERNEL__ */
 209
 210 #endif /* _S390_PAGE_H */