arch/s390/include/asm/page.h

   1 /*
   2  *  S390 version
   3  *    Copyright IBM Corp. 1999, 2000
   4  *    Author(s): Hartmut Penner (hp@de.ibm.com)
   5  */
   6
   7 #ifndef _S390_PAGE_H
   8 #define _S390_PAGE_H
   9
  10 #include <linux/const.h>
  11 #include <asm/types.h>
  12
  13 /* PAGE_SHIFT determines the page size */
  14 #define PAGE_SHIFT      12
  15 #define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
  16 #define PAGE_MASK       (~(PAGE_SIZE-1))
  17 #define PAGE_DEFAULT_ACC        0
  18 #define PAGE_DEFAULT_KEY        (PAGE_DEFAULT_ACC << 4)
  19
  20 #define HPAGE_SHIFT     20
  21 #define HPAGE_SIZE      (1UL << HPAGE_SHIFT)
  22 #define HPAGE_MASK      (~(HPAGE_SIZE - 1))
  23 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
  24
  25 #define ARCH_HAS_SETCLEAR_HUGE_PTE
  26 #define ARCH_HAS_HUGE_PTE_TYPE
  27 #define ARCH_HAS_PREPARE_HUGEPAGE
  28 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
  29
  30 #include <asm/setup.h>
  31 #ifndef __ASSEMBLY__
  32
  33 static inline void clear_page(void *page)
  34 {
  35         if (MACHINE_HAS_PFMF) {
  36                 asm volatile(
  37                         "       .insn   rre,0xb9af0000,%0,%1"
  38                         : : "d" (0x10000), "a" (page) : "memory", "cc");
  39         } else {
  40                 register unsigned long reg1 asm ("1") = 0;
  41                 register void *reg2 asm ("2") = page;
  42                 register unsigned long reg3 asm ("3") = 4096;
  43                 asm volatile(
  44                         "       mvcl    2,0"
  45                         : "+d" (reg2), "+d" (reg3) : "d" (reg1)
  46                         : "memory", "cc");
  47         }
  48 }
  49
  50 static inline void copy_page(void *to, void *from)
  51 {
  52         if (MACHINE_HAS_MVPG) {
  53                 register unsigned long reg0 asm ("0") = 0;
  54                 asm volatile(
  55                         "       mvpg    %0,%1"
  56                         : : "a" (to), "a" (from), "d" (reg0)
  57                         : "memory", "cc");
  58         } else
  59                 asm volatile(
  60                         "       mvc     0(256,%0),0(%1)\n"
  61                         "       mvc     256(256,%0),256(%1)\n"
  62                         "       mvc     512(256,%0),512(%1)\n"
  63                         "       mvc     768(256,%0),768(%1)\n"
  64                         "       mvc     1024(256,%0),1024(%1)\n"
  65                         "       mvc     1280(256,%0),1280(%1)\n"
  66                         "       mvc     1536(256,%0),1536(%1)\n"
  67                         "       mvc     1792(256,%0),1792(%1)\n"
  68                         "       mvc     2048(256,%0),2048(%1)\n"
  69                         "       mvc     2304(256,%0),2304(%1)\n"
  70                         "       mvc     2560(256,%0),2560(%1)\n"
  71                         "       mvc     2816(256,%0),2816(%1)\n"
  72                         "       mvc     3072(256,%0),3072(%1)\n"
  73                         "       mvc     3328(256,%0),3328(%1)\n"
  74                         "       mvc     3584(256,%0),3584(%1)\n"
  75                         "       mvc     3840(256,%0),3840(%1)\n"
  76                         : : "a" (to), "a" (from) : "memory");
  77 }
  78
  79 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  80 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  81
  82 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  83         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  84 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  85
  86 /*
  87  * These are used to make use of C type-checking..
  88  */
  89
  90 typedef struct { unsigned long pgprot; } pgprot_t;
  91 typedef struct { unsigned long pgste; } pgste_t;
  92 typedef struct { unsigned long pte; } pte_t;
  93 typedef struct { unsigned long pmd; } pmd_t;
  94 typedef struct { unsigned long pud; } pud_t;
  95 typedef struct { unsigned long pgd; } pgd_t;
  96 typedef pte_t *pgtable_t;
  97
  98 #define pgprot_val(x)   ((x).pgprot)
  99 #define pgste_val(x)    ((x).pgste)
 100 #define pte_val(x)      ((x).pte)
 101 #define pmd_val(x)      ((x).pmd)
 102 #define pud_val(x)      ((x).pud)
 103 #define pgd_val(x)      ((x).pgd)
 104
 105 #define __pgste(x)      ((pgste_t) { (x) } )
 106 #define __pte(x)        ((pte_t) { (x) } )
 107 #define __pmd(x)        ((pmd_t) { (x) } )
 108 #define __pud(x)        ((pud_t) { (x) } )
 109 #define __pgd(x)        ((pgd_t) { (x) } )
 110 #define __pgprot(x)     ((pgprot_t) { (x) } )
 111
 112 static inline void page_set_storage_key(unsigned long addr,
 113                                         unsigned char skey, int mapped)
 114 {
 115         if (!mapped)
 116                 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
 117                              : : "d" (skey), "a" (addr));
 118         else
 119                 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 120 }
 121
 122 static inline unsigned char page_get_storage_key(unsigned long addr)
 123 {
 124         unsigned char skey;
 125
 126         asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
 127         return skey;
 128 }
 129
 130 static inline int page_reset_referenced(unsigned long addr)
 131 {
 132         unsigned int ipm;
 133
 134         asm volatile(
 135                 "       rrbe    0,%1\n"
 136                 "       ipm     %0\n"
 137                 : "=d" (ipm) : "a" (addr) : "cc");
 138         return !!(ipm & 0x20000000);
 139 }
 140
 141 /* Bits int the storage key */
 142 #define _PAGE_CHANGED           0x02    /* HW changed bit               */
 143 #define _PAGE_REFERENCED        0x04    /* HW referenced bit            */
 144 #define _PAGE_FP_BIT            0x08    /* HW fetch protection bit      */
 145 #define _PAGE_ACC_BITS          0xf0    /* HW access control bits       */
 146
 147 /*
 148  * Test and clear dirty bit in storage key.
 149  * We can't clear the changed bit atomically. This is a potential
 150  * race against modification of the referenced bit. This function
 151  * should therefore only be called if it is not mapped in any
 152  * address space.
 153  */
 154 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
 155 static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped)
 156 {
 157         unsigned char skey;
 158
 159         skey = page_get_storage_key(pfn << PAGE_SHIFT);
 160         if (!(skey & _PAGE_CHANGED))
 161                 return 0;
 162         page_set_storage_key(pfn << PAGE_SHIFT, skey & ~_PAGE_CHANGED, mapped);
 163         return 1;
 164 }
 165
 166 /*
 167  * Test and clear referenced bit in storage key.
 168  */
 169 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
 170 static inline int page_test_and_clear_young(unsigned long pfn)
 171 {
 172         return page_reset_referenced(pfn << PAGE_SHIFT);
 173 }
 174
 175 struct page;
 176 void arch_free_page(struct page *page, int order);
 177 void arch_alloc_page(struct page *page, int order);
 178 void arch_set_page_states(int make_stable);
 179
 180 static inline int devmem_is_allowed(unsigned long pfn)
 181 {
 182         return 0;
 183 }
 184
 185 #define HAVE_ARCH_FREE_PAGE
 186 #define HAVE_ARCH_ALLOC_PAGE
 187
 188 #endif /* !__ASSEMBLY__ */
 189
 190 #define __PAGE_OFFSET           0x0UL
 191 #define PAGE_OFFSET             0x0UL
 192 #define __pa(x)                 (unsigned long)(x)
 193 #define __va(x)                 (void *)(unsigned long)(x)
 194 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 195 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 196 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 197
 198 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 199                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 200
 201 #include <asm-generic/memory_model.h>
 202 #include <asm-generic/getorder.h>
 203
 204 #define __HAVE_ARCH_GATE_AREA 1
 205
 206 #endif /* _S390_PAGE_H */