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 #include <asm/setup.h>
  23 #ifndef __ASSEMBLY__
  24
  25 static inline void clear_page(void *page)
  26 {
  27         register unsigned long reg1 asm ("1") = 0;
  28         register void *reg2 asm ("2") = page;
  29         register unsigned long reg3 asm ("3") = 4096;
  30         asm volatile(
  31                 "       mvcl    2,0"
  32                 : "+d" (reg2), "+d" (reg3) : "d" (reg1) : "memory", "cc");
  33 }
  34
  35 static inline void copy_page(void *to, void *from)
  36 {
  37         if (MACHINE_HAS_MVPG) {
  38                 register unsigned long reg0 asm ("0") = 0;
  39                 asm volatile(
  40                         "       mvpg    %0,%1"
  41                         : : "a" (to), "a" (from), "d" (reg0)
  42                         : "memory", "cc");
  43         } else
  44                 asm volatile(
  45                         "       mvc     0(256,%0),0(%1)\n"
  46                         "       mvc     256(256,%0),256(%1)\n"
  47                         "       mvc     512(256,%0),512(%1)\n"
  48                         "       mvc     768(256,%0),768(%1)\n"
  49                         "       mvc     1024(256,%0),1024(%1)\n"
  50                         "       mvc     1280(256,%0),1280(%1)\n"
  51                         "       mvc     1536(256,%0),1536(%1)\n"
  52                         "       mvc     1792(256,%0),1792(%1)\n"
  53                         "       mvc     2048(256,%0),2048(%1)\n"
  54                         "       mvc     2304(256,%0),2304(%1)\n"
  55                         "       mvc     2560(256,%0),2560(%1)\n"
  56                         "       mvc     2816(256,%0),2816(%1)\n"
  57                         "       mvc     3072(256,%0),3072(%1)\n"
  58                         "       mvc     3328(256,%0),3328(%1)\n"
  59                         "       mvc     3584(256,%0),3584(%1)\n"
  60                         "       mvc     3840(256,%0),3840(%1)\n"
  61                         : : "a" (to), "a" (from) : "memory");
  62 }
  63
  64 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  65 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  66
  67 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  68         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  69 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  70
  71 /*
  72  * These are used to make use of C type-checking..
  73  */
  74
  75 typedef struct { unsigned long pgprot; } pgprot_t;
  76 typedef struct { unsigned long pte; } pte_t;
  77 typedef struct { unsigned long pmd; } pmd_t;
  78 typedef struct { unsigned long pud; } pud_t;
  79 typedef struct { unsigned long pgd; } pgd_t;
  80 typedef pte_t *pgtable_t;
  81
  82 #define pgprot_val(x)   ((x).pgprot)
  83 #define pte_val(x)      ((x).pte)
  84 #define pmd_val(x)      ((x).pmd)
  85 #define pud_val(x)      ((x).pud)
  86 #define pgd_val(x)      ((x).pgd)
  87
  88 #define __pte(x)        ((pte_t) { (x) } )
  89 #define __pmd(x)        ((pmd_t) { (x) } )
  90 #define __pgd(x)        ((pgd_t) { (x) } )
  91 #define __pgprot(x)     ((pgprot_t) { (x) } )
  92
  93 /* default storage key used for all pages */
  94 extern unsigned int default_storage_key;
  95
  96 static inline void
  97 page_set_storage_key(unsigned long addr, unsigned int skey)
  98 {
  99         asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 100 }
 101
 102 static inline unsigned int
 103 page_get_storage_key(unsigned long addr)
 104 {
 105         unsigned int skey;
 106
 107         asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr), "0" (0));
 108         return skey;
 109 }
 110
 111 extern unsigned long max_pfn;
 112
 113 static inline int pfn_valid(unsigned long pfn)
 114 {
 115         unsigned long dummy;
 116         int ccode;
 117
 118         if (pfn >= max_pfn)
 119                 return 0;
 120
 121         asm volatile(
 122                 "       lra     %0,0(%2)\n"
 123                 "       ipm     %1\n"
 124                 "       srl     %1,28\n"
 125                 : "=d" (dummy), "=d" (ccode)
 126                 : "a" (pfn << PAGE_SHIFT)
 127                 : "cc");
 128         return !ccode;
 129 }
 130
 131 #endif /* !__ASSEMBLY__ */
 132
 133 /* to align the pointer to the (next) page boundary */
 134 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 135
 136 #define __PAGE_OFFSET           0x0UL
 137 #define PAGE_OFFSET             0x0UL
 138 #define __pa(x)                 (unsigned long)(x)
 139 #define __va(x)                 (void *)(unsigned long)(x)
 140 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 141 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 142 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 143
 144 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 145                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 146
 147 #include <asm-generic/memory_model.h>
 148 #include <asm-generic/page.h>
 149
 150 #endif /* _S390_PAGE_H */