release/src-rt-6.x/linux/linux-2.6/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/types.h>
  13
  14 /* PAGE_SHIFT determines the page size */
  15 #define PAGE_SHIFT      12
  16 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
  17 #define PAGE_MASK       (~(PAGE_SIZE-1))
  18 #define PAGE_DEFAULT_ACC        0
  19 #define PAGE_DEFAULT_KEY        (PAGE_DEFAULT_ACC << 4)
  20
  21 #ifdef __KERNEL__
  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
  78 #define pte_val(x)      ((x).pte)
  79 #define pgprot_val(x)   ((x).pgprot)
  80
  81 #ifndef __s390x__
  82
  83 typedef struct { unsigned long pmd; } pmd_t;
  84 typedef struct {
  85         unsigned long pgd0;
  86         unsigned long pgd1;
  87         unsigned long pgd2;
  88         unsigned long pgd3;
  89         } pgd_t;
  90
  91 #define pmd_val(x)      ((x).pmd)
  92 #define pgd_val(x)      ((x).pgd0)
  93
  94 #else /* __s390x__ */
  95
  96 typedef struct {
  97         unsigned long pmd0;
  98         unsigned long pmd1;
  99         } pmd_t;
 100 typedef struct { unsigned long pgd; } pgd_t;
 101
 102 #define pmd_val(x)      ((x).pmd0)
 103 #define pmd_val1(x)     ((x).pmd1)
 104 #define pgd_val(x)      ((x).pgd)
 105
 106 #endif /* __s390x__ */
 107
 108 #define __pte(x)        ((pte_t) { (x) } )
 109 #define __pmd(x)        ((pmd_t) { (x) } )
 110 #define __pgd(x)        ((pgd_t) { (x) } )
 111 #define __pgprot(x)     ((pgprot_t) { (x) } )
 112
 113 /* default storage key used for all pages */
 114 extern unsigned int default_storage_key;
 115
 116 static inline void
 117 page_set_storage_key(unsigned long addr, unsigned int skey)
 118 {
 119         asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 120 }
 121
 122 static inline unsigned int
 123 page_get_storage_key(unsigned long addr)
 124 {
 125         unsigned int skey;
 126
 127         asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr), "0" (0));
 128         return skey;
 129 }
 130
 131 extern unsigned long max_pfn;
 132
 133 static inline int pfn_valid(unsigned long pfn)
 134 {
 135         unsigned long dummy;
 136         int ccode;
 137
 138         if (pfn >= max_pfn)
 139                 return 0;
 140
 141         asm volatile(
 142                 "       lra     %0,0(%2)\n"
 143                 "       ipm     %1\n"
 144                 "       srl     %1,28\n"
 145                 : "=d" (dummy), "=d" (ccode)
 146                 : "a" (pfn << PAGE_SHIFT)
 147                 : "cc");
 148         return !ccode;
 149 }
 150
 151 #endif /* !__ASSEMBLY__ */
 152
 153 /* to align the pointer to the (next) page boundary */
 154 #define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 155
 156 #define __PAGE_OFFSET           0x0UL
 157 #define PAGE_OFFSET             0x0UL
 158 #define __pa(x)                 (unsigned long)(x)
 159 #define __va(x)                 (void *)(unsigned long)(x)
 160 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 161 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 162 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 163
 164 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 165                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 166
 167 #include <asm-generic/memory_model.h>
 168 #include <asm-generic/page.h>
 169
 170 #endif /* __KERNEL__ */
 171
 172 #endif /* _S390_PAGE_H */