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 <linux/const.h>
  13 #include <asm/types.h>
  14
  15 /* PAGE_SHIFT determines the page size */
  16 #define PAGE_SHIFT      12
  17 #define PAGE_SIZE       (_AC(1,UL) << 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 #include <asm/setup.h>
  24 #ifndef __ASSEMBLY__
  25
  26 static inline void clear_page(void *page)
  27 {
  28         register unsigned long reg1 asm ("1") = 0;
  29         register void *reg2 asm ("2") = page;
  30         register unsigned long reg3 asm ("3") = 4096;
  31         asm volatile(
  32                 "       mvcl    2,0"
  33                 : "+d" (reg2), "+d" (reg3) : "d" (reg1) : "memory", "cc");
  34 }
  35
  36 static inline void copy_page(void *to, void *from)
  37 {
  38         if (MACHINE_HAS_MVPG) {
  39                 register unsigned long reg0 asm ("0") = 0;
  40                 asm volatile(
  41                         "       mvpg    %0,%1"
  42                         : : "a" (to), "a" (from), "d" (reg0)
  43                         : "memory", "cc");
  44         } else
  45                 asm volatile(
  46                         "       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" (to), "a" (from) : "memory");
  63 }
  64
  65 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  66 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  67
  68 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  69         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  70 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  71
  72 /*
  73  * These are used to make use of C type-checking..
  74  */
  75
  76 typedef struct { unsigned long pgprot; } pgprot_t;
  77 typedef struct { unsigned long pte; } pte_t;
  78
  79 #define pte_val(x)      ((x).pte)
  80 #define pgprot_val(x)   ((x).pgprot)
  81
  82 #ifndef __s390x__
  83
  84 typedef struct { unsigned long pmd; } pmd_t;
  85 typedef struct {
  86         unsigned long pgd0;
  87         unsigned long pgd1;
  88         unsigned long pgd2;
  89         unsigned long pgd3;
  90         } pgd_t;
  91
  92 #define pmd_val(x)      ((x).pmd)
  93 #define pgd_val(x)      ((x).pgd0)
  94
  95 #else /* __s390x__ */
  96
  97 typedef struct {
  98         unsigned long pmd0;
  99         unsigned long pmd1;
 100         } pmd_t;
 101 typedef struct { unsigned long pgd; } pgd_t;
 102
 103 #define pmd_val(x)      ((x).pmd0)
 104 #define pmd_val1(x)     ((x).pmd1)
 105 #define pgd_val(x)      ((x).pgd)
 106
 107 #endif /* __s390x__ */
 108
 109 #define __pte(x)        ((pte_t) { (x) } )
 110 #define __pmd(x)        ((pmd_t) { (x) } )
 111 #define __pgd(x)        ((pgd_t) { (x) } )
 112 #define __pgprot(x)     ((pgprot_t) { (x) } )
 113
 114 /* default storage key used for all pages */
 115 extern unsigned int default_storage_key;
 116
 117 static inline void
 118 page_set_storage_key(unsigned long addr, unsigned int skey)
 119 {
 120         asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 121 }
 122
 123 static inline unsigned int
 124 page_get_storage_key(unsigned long addr)
 125 {
 126         unsigned int skey;
 127
 128         asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr), "0" (0));
 129         return skey;
 130 }
 131
 132 extern unsigned long max_pfn;
 133
 134 static inline int pfn_valid(unsigned long pfn)
 135 {
 136         unsigned long dummy;
 137         int ccode;
 138
 139         if (pfn >= max_pfn)
 140                 return 0;
 141
 142         asm volatile(
 143                 "       lra     %0,0(%2)\n"
 144                 "       ipm     %1\n"
 145                 "       srl     %1,28\n"
 146                 : "=d" (dummy), "=d" (ccode)
 147                 : "a" (pfn << PAGE_SHIFT)
 148                 : "cc");
 149         return !ccode;
 150 }
 151
 152 #endif /* !__ASSEMBLY__ */
 153
 154 /* to align the pointer to the (next) page boundary */
 155 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 156
 157 #define __PAGE_OFFSET           0x0UL
 158 #define PAGE_OFFSET             0x0UL
 159 #define __pa(x)                 (unsigned long)(x)
 160 #define __va(x)                 (void *)(unsigned long)(x)
 161 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 162 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 163 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 164
 165 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 166                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 167
 168 #include <asm-generic/memory_model.h>
 169 #include <asm-generic/page.h>
 170
 171 #endif /* __KERNEL__ */
 172
 173 #endif /* _S390_PAGE_H */