arch/s390/include/asm/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 #define HPAGE_SHIFT     20
  23 #define HPAGE_SIZE      (1UL << HPAGE_SHIFT)
  24 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  25 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  26
  27 #define ARCH_HAS_SETCLEAR_HUGE_PTE
  28 #define ARCH_HAS_HUGE_PTE_TYPE
  29 #define ARCH_HAS_PREPARE_HUGEPAGE
  30 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
  31
  32 #include <asm/setup.h>
  33 #ifndef __ASSEMBLY__
  34
  35 static inline void clear_page(void *page)
  36 {
  37         if (MACHINE_HAS_PFMF) {
  38                 asm volatile(
  39                         "       .insn   rre,0xb9af0000,%0,%1"
  40                         : : "d" (0x10000), "a" (page) : "memory", "cc");
  41         } else {
  42                 register unsigned long reg1 asm ("1") = 0;
  43                 register void *reg2 asm ("2") = page;
  44                 register unsigned long reg3 asm ("3") = 4096;
  45                 asm volatile(
  46                         "       mvcl    2,0"
  47                         : "+d" (reg2), "+d" (reg3) : "d" (reg1)
  48                         : "memory", "cc");
  49         }
  50 }
  51
  52 static inline void copy_page(void *to, void *from)
  53 {
  54         if (MACHINE_HAS_MVPG) {
  55                 register unsigned long reg0 asm ("0") = 0;
  56                 asm volatile(
  57                         "       mvpg    %0,%1"
  58                         : : "a" (to), "a" (from), "d" (reg0)
  59                         : "memory", "cc");
  60         } else
  61                 asm volatile(
  62                         "       mvc     0(256,%0),0(%1)\n"
  63                         "       mvc     256(256,%0),256(%1)\n"
  64                         "       mvc     512(256,%0),512(%1)\n"
  65                         "       mvc     768(256,%0),768(%1)\n"
  66                         "       mvc     1024(256,%0),1024(%1)\n"
  67                         "       mvc     1280(256,%0),1280(%1)\n"
  68                         "       mvc     1536(256,%0),1536(%1)\n"
  69                         "       mvc     1792(256,%0),1792(%1)\n"
  70                         "       mvc     2048(256,%0),2048(%1)\n"
  71                         "       mvc     2304(256,%0),2304(%1)\n"
  72                         "       mvc     2560(256,%0),2560(%1)\n"
  73                         "       mvc     2816(256,%0),2816(%1)\n"
  74                         "       mvc     3072(256,%0),3072(%1)\n"
  75                         "       mvc     3328(256,%0),3328(%1)\n"
  76                         "       mvc     3584(256,%0),3584(%1)\n"
  77                         "       mvc     3840(256,%0),3840(%1)\n"
  78                         : : "a" (to), "a" (from) : "memory");
  79 }
  80
  81 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  82 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  83
  84 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  85         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  86 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  87
  88 /*
  89  * These are used to make use of C type-checking..
  90  */
  91
  92 typedef struct { unsigned long pgprot; } pgprot_t;
  93 typedef struct { unsigned long pgste; } pgste_t;
  94 typedef struct { unsigned long pte; } pte_t;
  95 typedef struct { unsigned long pmd; } pmd_t;
  96 typedef struct { unsigned long pud; } pud_t;
  97 typedef struct { unsigned long pgd; } pgd_t;
  98 typedef pte_t *pgtable_t;
  99
 100 #define pgprot_val(x)   ((x).pgprot)
 101 #define pgste_val(x)    ((x).pgste)
 102 #define pte_val(x)      ((x).pte)
 103 #define pmd_val(x)      ((x).pmd)
 104 #define pud_val(x)      ((x).pud)
 105 #define pgd_val(x)      ((x).pgd)
 106
 107 #define __pgste(x)      ((pgste_t) { (x) } )
 108 #define __pte(x)        ((pte_t) { (x) } )
 109 #define __pmd(x)        ((pmd_t) { (x) } )
 110 #define __pud(x)        ((pud_t) { (x) } )
 111 #define __pgd(x)        ((pgd_t) { (x) } )
 112 #define __pgprot(x)     ((pgprot_t) { (x) } )
 113
 114 static inline void page_set_storage_key(unsigned long addr,
 115                                         unsigned char skey, int mapped)
 116 {
 117         if (!mapped)
 118                 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
 119                              : : "d" (skey), "a" (addr));
 120         else
 121                 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 122 }
 123
 124 static inline unsigned char page_get_storage_key(unsigned long addr)
 125 {
 126         unsigned char skey;
 127
 128         asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
 129         return skey;
 130 }
 131
 132 static inline int page_reset_referenced(unsigned long addr)
 133 {
 134         unsigned int ipm;
 135
 136         asm volatile(
 137                 "       rrbe    0,%1\n"
 138                 "       ipm     %0\n"
 139                 : "=d" (ipm) : "a" (addr) : "cc");
 140         return !!(ipm & 0x20000000);
 141 }
 142
 143 /* Bits int the storage key */
 144 #define _PAGE_CHANGED           0x02    /* HW changed bit               */
 145 #define _PAGE_REFERENCED        0x04    /* HW referenced bit            */
 146 #define _PAGE_FP_BIT            0x08    /* HW fetch protection bit      */
 147 #define _PAGE_ACC_BITS          0xf0    /* HW access control bits       */
 148
 149 /*
 150  * Test and clear dirty bit in storage key.
 151  * We can't clear the changed bit atomically. This is a potential
 152  * race against modification of the referenced bit. This function
 153  * should therefore only be called if it is not mapped in any
 154  * address space.
 155  */
 156 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
 157 static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped)
 158 {
 159         unsigned char skey;
 160
 161         skey = page_get_storage_key(pfn << PAGE_SHIFT);
 162         if (!(skey & _PAGE_CHANGED))
 163                 return 0;
 164         page_set_storage_key(pfn << PAGE_SHIFT, skey & ~_PAGE_CHANGED, mapped);
 165         return 1;
 166 }
 167
 168 /*
 169  * Test and clear referenced bit in storage key.
 170  */
 171 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
 172 static inline int page_test_and_clear_young(unsigned long pfn)
 173 {
 174         return page_reset_referenced(pfn << PAGE_SHIFT);
 175 }
 176
 177 struct page;
 178 void arch_free_page(struct page *page, int order);
 179 void arch_alloc_page(struct page *page, int order);
 180
 181 static inline int devmem_is_allowed(unsigned long pfn)
 182 {
 183         return 0;
 184 }
 185
 186 #define HAVE_ARCH_FREE_PAGE
 187 #define HAVE_ARCH_ALLOC_PAGE
 188
 189 #endif /* !__ASSEMBLY__ */
 190
 191 #define __PAGE_OFFSET           0x0UL
 192 #define PAGE_OFFSET             0x0UL
 193 #define __pa(x)                 (unsigned long)(x)
 194 #define __va(x)                 (void *)(unsigned long)(x)
 195 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 196 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 197 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 198
 199 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 200                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 201
 202 #include <asm-generic/memory_model.h>
 203 #include <asm-generic/getorder.h>
 204
 205 #define __HAVE_ARCH_GATE_AREA 1
 206
 207 #endif /* _S390_PAGE_H */