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 #define HUGE_MAX_HSTATE         2
  25
  26 #define ARCH_HAS_SETCLEAR_HUGE_PTE
  27 #define ARCH_HAS_HUGE_PTE_TYPE
  28 #define ARCH_HAS_PREPARE_HUGEPAGE
  29 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
  30
  31 #include <asm/setup.h>
  32 #ifndef __ASSEMBLY__
  33
  34 void __storage_key_init_range(unsigned long start, unsigned long end);
  35
  36 static inline void storage_key_init_range(unsigned long start, unsigned long end)
  37 {
  38         if (PAGE_DEFAULT_KEY)
  39                 __storage_key_init_range(start, end);
  40 }
  41
  42 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
  43
  44 /*
  45  * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
  46  * bypass caches when copying a page. Especially when copying huge pages
  47  * this keeps L1 and L2 data caches alive.
  48  */
  49 static inline void copy_page(void *to, void *from)
  50 {
  51         register void *reg2 asm ("2") = to;
  52         register unsigned long reg3 asm ("3") = 0x1000;
  53         register void *reg4 asm ("4") = from;
  54         register unsigned long reg5 asm ("5") = 0xb0001000;
  55         asm volatile(
  56                 "       mvcl    2,4"
  57                 : "+d" (reg2), "+d" (reg3), "+d" (reg4), "+d" (reg5)
  58                 : : "memory", "cc");
  59 }
  60
  61 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  62 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  63
  64 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  65         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  66 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  67
  68 /*
  69  * These are used to make use of C type-checking..
  70  */
  71
  72 typedef struct { unsigned long pgprot; } pgprot_t;
  73 typedef struct { unsigned long pgste; } pgste_t;
  74 typedef struct { unsigned long pte; } pte_t;
  75 typedef struct { unsigned long pmd; } pmd_t;
  76 typedef struct { unsigned long pud; } pud_t;
  77 typedef struct { unsigned long pgd; } pgd_t;
  78 typedef pte_t *pgtable_t;
  79
  80 #define pgprot_val(x)   ((x).pgprot)
  81 #define pgste_val(x)    ((x).pgste)
  82 #define pte_val(x)      ((x).pte)
  83 #define pmd_val(x)      ((x).pmd)
  84 #define pud_val(x)      ((x).pud)
  85 #define pgd_val(x)      ((x).pgd)
  86
  87 #define __pgste(x)      ((pgste_t) { (x) } )
  88 #define __pte(x)        ((pte_t) { (x) } )
  89 #define __pmd(x)        ((pmd_t) { (x) } )
  90 #define __pud(x)        ((pud_t) { (x) } )
  91 #define __pgd(x)        ((pgd_t) { (x) } )
  92 #define __pgprot(x)     ((pgprot_t) { (x) } )
  93
  94 static inline void page_set_storage_key(unsigned long addr,
  95                                         unsigned char skey, int mapped)
  96 {
  97         if (!mapped)
  98                 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
  99                              : : "d" (skey), "a" (addr));
 100         else
 101                 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 102 }
 103
 104 static inline unsigned char page_get_storage_key(unsigned long addr)
 105 {
 106         unsigned char skey;
 107
 108         asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
 109         return skey;
 110 }
 111
 112 static inline int page_reset_referenced(unsigned long addr)
 113 {
 114         int cc;
 115
 116         asm volatile(
 117                 "       rrbe    0,%1\n"
 118                 "       ipm     %0\n"
 119                 "       srl     %0,28\n"
 120                 : "=d" (cc) : "a" (addr) : "cc");
 121         return cc;
 122 }
 123
 124 /* Bits int the storage key */
 125 #define _PAGE_CHANGED           0x02    /* HW changed bit               */
 126 #define _PAGE_REFERENCED        0x04    /* HW referenced bit            */
 127 #define _PAGE_FP_BIT            0x08    /* HW fetch protection bit      */
 128 #define _PAGE_ACC_BITS          0xf0    /* HW access control bits       */
 129
 130 struct page;
 131 void arch_free_page(struct page *page, int order);
 132 void arch_alloc_page(struct page *page, int order);
 133 void arch_set_page_states(int make_stable);
 134
 135 static inline int devmem_is_allowed(unsigned long pfn)
 136 {
 137         return 0;
 138 }
 139
 140 #define HAVE_ARCH_FREE_PAGE
 141 #define HAVE_ARCH_ALLOC_PAGE
 142
 143 #endif /* !__ASSEMBLY__ */
 144
 145 #define __PAGE_OFFSET           0x0UL
 146 #define PAGE_OFFSET             0x0UL
 147 #define __pa(x)                 (unsigned long)(x)
 148 #define __va(x)                 (void *)(unsigned long)(x)
 149 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 150 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 151 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 152 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 153 #define page_to_virt(page)      pfn_to_virt(page_to_pfn(page))
 154
 155 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 156                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 157
 158 #include <asm-generic/memory_model.h>
 159 #include <asm-generic/getorder.h>
 160
 161 #endif /* _S390_PAGE_H */