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 storage_key_init_range(unsigned long start, unsigned long end)
  34 {
  35 #if PAGE_DEFAULT_KEY
  36         __storage_key_init_range(start, end);
  37 #endif
  38 }
  39
  40 static inline void clear_page(void *page)
  41 {
  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  * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
  53  * bypass caches when copying a page. Especially when copying huge pages
  54  * this keeps L1 and L2 data caches alive.
  55  */
  56 static inline void copy_page(void *to, void *from)
  57 {
  58         register void *reg2 asm ("2") = to;
  59         register unsigned long reg3 asm ("3") = 0x1000;
  60         register void *reg4 asm ("4") = from;
  61         register unsigned long reg5 asm ("5") = 0xb0001000;
  62         asm volatile(
  63                 "       mvcl    2,4"
  64                 : "+d" (reg2), "+d" (reg3), "+d" (reg4), "+d" (reg5)
  65                 : : "memory", "cc");
  66 }
  67
  68 #define clear_user_page(page, vaddr, pg)        clear_page(page)
  69 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
  70
  71 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
  72         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
  73 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
  74
  75 /*
  76  * These are used to make use of C type-checking..
  77  */
  78
  79 typedef struct { unsigned long pgprot; } pgprot_t;
  80 typedef struct { unsigned long pgste; } pgste_t;
  81 typedef struct { unsigned long pte; } pte_t;
  82 typedef struct { unsigned long pmd; } pmd_t;
  83 typedef struct { unsigned long pud; } pud_t;
  84 typedef struct { unsigned long pgd; } pgd_t;
  85 typedef pte_t *pgtable_t;
  86
  87 #define pgprot_val(x)   ((x).pgprot)
  88 #define pgste_val(x)    ((x).pgste)
  89 #define pte_val(x)      ((x).pte)
  90 #define pmd_val(x)      ((x).pmd)
  91 #define pud_val(x)      ((x).pud)
  92 #define pgd_val(x)      ((x).pgd)
  93
  94 #define __pgste(x)      ((pgste_t) { (x) } )
  95 #define __pte(x)        ((pte_t) { (x) } )
  96 #define __pmd(x)        ((pmd_t) { (x) } )
  97 #define __pud(x)        ((pud_t) { (x) } )
  98 #define __pgd(x)        ((pgd_t) { (x) } )
  99 #define __pgprot(x)     ((pgprot_t) { (x) } )
 100
 101 static inline void page_set_storage_key(unsigned long addr,
 102                                         unsigned char skey, int mapped)
 103 {
 104         if (!mapped)
 105                 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
 106                              : : "d" (skey), "a" (addr));
 107         else
 108                 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
 109 }
 110
 111 static inline unsigned char page_get_storage_key(unsigned long addr)
 112 {
 113         unsigned char skey;
 114
 115         asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
 116         return skey;
 117 }
 118
 119 static inline int page_reset_referenced(unsigned long addr)
 120 {
 121         unsigned int ipm;
 122
 123         asm volatile(
 124                 "       rrbe    0,%1\n"
 125                 "       ipm     %0\n"
 126                 : "=d" (ipm) : "a" (addr) : "cc");
 127         return !!(ipm & 0x20000000);
 128 }
 129
 130 /* Bits int the storage key */
 131 #define _PAGE_CHANGED           0x02    /* HW changed bit               */
 132 #define _PAGE_REFERENCED        0x04    /* HW referenced bit            */
 133 #define _PAGE_FP_BIT            0x08    /* HW fetch protection bit      */
 134 #define _PAGE_ACC_BITS          0xf0    /* HW access control bits       */
 135
 136 struct page;
 137 void arch_free_page(struct page *page, int order);
 138 void arch_alloc_page(struct page *page, int order);
 139 void arch_set_page_states(int make_stable);
 140
 141 static inline int devmem_is_allowed(unsigned long pfn)
 142 {
 143         return 0;
 144 }
 145
 146 #define HAVE_ARCH_FREE_PAGE
 147 #define HAVE_ARCH_ALLOC_PAGE
 148
 149 #endif /* !__ASSEMBLY__ */
 150
 151 #define __PAGE_OFFSET           0x0UL
 152 #define PAGE_OFFSET             0x0UL
 153 #define __pa(x)                 (unsigned long)(x)
 154 #define __va(x)                 (void *)(unsigned long)(x)
 155 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 156 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 157 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 158
 159 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
 160                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 161
 162 #include <asm-generic/memory_model.h>
 163 #include <asm-generic/getorder.h>
 164
 165 #endif /* _S390_PAGE_H */