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 void storage_key_init_range(unsigned long start, unsigned long end);
  34
  35 static unsigned long pfmf(unsigned long function, unsigned long address)
  36 {
  37         asm volatile(
  38                 "       .insn   rre,0xb9af0000,%[function],%[address]"
  39                 : [address] "+a" (address)
  40                 : [function] "d" (function)
  41                 : "memory");
  42         return address;
  43 }
  44
  45 static inline void clear_page(void *page)
  46 {
  47         if (MACHINE_HAS_PFMF) {
  48                 pfmf(0x10000, (unsigned long)page);
  49         } else {
  50                 register unsigned long reg1 asm ("1") = 0;
  51                 register void *reg2 asm ("2") = page;
  52                 register unsigned long reg3 asm ("3") = 4096;
  53                 asm volatile(
  54                         "       mvcl    2,0"
  55                         : "+d" (reg2), "+d" (reg3) : "d" (reg1)
  56                         : "memory", "cc");
  57         }
  58 }
  59
  60 static inline void copy_page(void *to, void *from)
  61 {
  62         if (MACHINE_HAS_MVPG) {
  63                 register unsigned long reg0 asm ("0") = 0;
  64                 asm volatile(
  65                         "       mvpg    %0,%1"
  66                         : : "a" (to), "a" (from), "d" (reg0)
  67                         : "memory", "cc");
  68         } else
  69                 asm volatile(
  70                         "       mvc     0(256,%0),0(%1)\n"
  71                         "       mvc     256(256,%0),256(%1)\n"
  72                         "       mvc     512(256,%0),512(%1)\n"
  73                         "       mvc     768(256,%0),768(%1)\n"
  74                         "       mvc     1024(256,%0),1024(%1)\n"
  75                         "       mvc     1280(256,%0),1280(%1)\n"
  76                         "       mvc     1536(256,%0),1536(%1)\n"
  77                         "       mvc     1792(256,%0),1792(%1)\n"
  78                         "       mvc     2048(256,%0),2048(%1)\n"
  79                         "       mvc     2304(256,%0),2304(%1)\n"
  80                         "       mvc     2560(256,%0),2560(%1)\n"
  81                         "       mvc     2816(256,%0),2816(%1)\n"
  82                         "       mvc     3072(256,%0),3072(%1)\n"
  83                         "       mvc     3328(256,%0),3328(%1)\n"
  84                         "       mvc     3584(256,%0),3584(%1)\n"
  85                         "       mvc     3840(256,%0),3840(%1)\n"
  86                         : : "a" (to), "a" (from) : "memory");
  87 }
  88
  89 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  90 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  91
  92 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  93         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  94 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  95
  96 /*
  97  * These are used to make use of C type-checking..
  98  */
  99
 100 typedef struct { unsigned long pgprot; } pgprot_t;
 101 typedef struct { unsigned long pgste; } pgste_t;
 102 typedef struct { unsigned long pte; } pte_t;
 103 typedef struct { unsigned long pmd; } pmd_t;
 104 typedef struct { unsigned long pud; } pud_t;
 105 typedef struct { unsigned long pgd; } pgd_t;
 106 typedef pte_t *pgtable_t;
 107
 108 #define pgprot_val(x)   ((x).pgprot)
 109 #define pgste_val(x)    ((x).pgste)
 110 #define pte_val(x)      ((x).pte)
 111 #define pmd_val(x)      ((x).pmd)
 112 #define pud_val(x)      ((x).pud)
 113 #define pgd_val(x)      ((x).pgd)
 114
 115 #define __pgste(x)      ((pgste_t) { (x) } )
 116 #define __pte(x)        ((pte_t) { (x) } )
 117 #define __pmd(x)        ((pmd_t) { (x) } )
 118 #define __pud(x)        ((pud_t) { (x) } )
 119 #define __pgd(x)        ((pgd_t) { (x) } )
 120 #define __pgprot(x)     ((pgprot_t) { (x) } )
 121
 122 static inline void page_set_storage_key(unsigned long addr,
 123                                         unsigned char skey, int mapped)
 124 {
 125         if (!mapped)
 126                 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
 127                              : : "d" (skey), "a" (addr));
 128         else
 129                 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 130 }
 131
 132 static inline unsigned char page_get_storage_key(unsigned long addr)
 133 {
 134         unsigned char skey;
 135
 136         asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
 137         return skey;
 138 }
 139
 140 static inline int page_reset_referenced(unsigned long addr)
 141 {
 142         unsigned int ipm;
 143
 144         asm volatile(
 145                 "       rrbe    0,%1\n"
 146                 "       ipm     %0\n"
 147                 : "=d" (ipm) : "a" (addr) : "cc");
 148         return !!(ipm & 0x20000000);
 149 }
 150
 151 /* Bits int the storage key */
 152 #define _PAGE_CHANGED           0x02    /* HW changed bit               */
 153 #define _PAGE_REFERENCED        0x04    /* HW referenced bit            */
 154 #define _PAGE_FP_BIT            0x08    /* HW fetch protection bit      */
 155 #define _PAGE_ACC_BITS          0xf0    /* HW access control bits       */
 156
 157 /*
 158  * Test and clear referenced bit in storage key.
 159  */
 160 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
 161 static inline int page_test_and_clear_young(unsigned long pfn)
 162 {
 163         return page_reset_referenced(pfn << PAGE_SHIFT);
 164 }
 165
 166 struct page;
 167 void arch_free_page(struct page *page, int order);
 168 void arch_alloc_page(struct page *page, int order);
 169 void arch_set_page_states(int make_stable);
 170
 171 static inline int devmem_is_allowed(unsigned long pfn)
 172 {
 173         return 0;
 174 }
 175
 176 #define HAVE_ARCH_FREE_PAGE
 177 #define HAVE_ARCH_ALLOC_PAGE
 178
 179 #endif /* !__ASSEMBLY__ */
 180
 181 #define __PAGE_OFFSET           0x0UL
 182 #define PAGE_OFFSET             0x0UL
 183 #define __pa(x)                 (unsigned long)(x)
 184 #define __va(x)                 (void *)(unsigned long)(x)
 185 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 186 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 187 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 188
 189 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 190                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 191
 192 #include <asm-generic/memory_model.h>
 193 #include <asm-generic/getorder.h>
 194
 195 #define __HAVE_ARCH_GATE_AREA 1
 196
 197 #endif /* _S390_PAGE_H */