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Linux/arch/s390/include/asm/page.h

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  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 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
 41 
 42 /*
 43  * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
 44  * bypass caches when copying a page. Especially when copying huge pages
 45  * this keeps L1 and L2 data caches alive.
 46  */
 47 static inline void copy_page(void *to, void *from)
 48 {
 49         register void *reg2 asm ("2") = to;
 50         register unsigned long reg3 asm ("3") = 0x1000;
 51         register void *reg4 asm ("4") = from;
 52         register unsigned long reg5 asm ("5") = 0xb0001000;
 53         asm volatile(
 54                 "       mvcl    2,4"
 55                 : "+d" (reg2), "+d" (reg3), "+d" (reg4), "+d" (reg5)
 56                 : : "memory", "cc");
 57 }
 58 
 59 #define clear_user_page(page, vaddr, pg)        clear_page(page)
 60 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
 61 
 62 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
 63         alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
 64 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
 65 
 66 /*
 67  * These are used to make use of C type-checking..
 68  */
 69 
 70 typedef struct { unsigned long pgprot; } pgprot_t;
 71 typedef struct { unsigned long pgste; } pgste_t;
 72 typedef struct { unsigned long pte; } pte_t;
 73 typedef struct { unsigned long pmd; } pmd_t;
 74 typedef struct { unsigned long pud; } pud_t;
 75 typedef struct { unsigned long pgd; } pgd_t;
 76 typedef pte_t *pgtable_t;
 77 
 78 #define pgprot_val(x)   ((x).pgprot)
 79 #define pgste_val(x)    ((x).pgste)
 80 #define pte_val(x)      ((x).pte)
 81 #define pmd_val(x)      ((x).pmd)
 82 #define pud_val(x)      ((x).pud)
 83 #define pgd_val(x)      ((x).pgd)
 84 
 85 #define __pgste(x)      ((pgste_t) { (x) } )
 86 #define __pte(x)        ((pte_t) { (x) } )
 87 #define __pmd(x)        ((pmd_t) { (x) } )
 88 #define __pud(x)        ((pud_t) { (x) } )
 89 #define __pgd(x)        ((pgd_t) { (x) } )
 90 #define __pgprot(x)     ((pgprot_t) { (x) } )
 91 
 92 static inline void page_set_storage_key(unsigned long addr,
 93                                         unsigned char skey, int mapped)
 94 {
 95         if (!mapped)
 96                 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
 97                              : : "d" (skey), "a" (addr));
 98         else
 99                 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
100 }
101 
102 static inline unsigned char page_get_storage_key(unsigned long addr)
103 {
104         unsigned char skey;
105 
106         asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
107         return skey;
108 }
109 
110 static inline int page_reset_referenced(unsigned long addr)
111 {
112         unsigned int ipm;
113 
114         asm volatile(
115                 "       rrbe    0,%1\n"
116                 "       ipm     %0\n"
117                 : "=d" (ipm) : "a" (addr) : "cc");
118         return !!(ipm & 0x20000000);
119 }
120 
121 /* Bits int the storage key */
122 #define _PAGE_CHANGED           0x02    /* HW changed bit               */
123 #define _PAGE_REFERENCED        0x04    /* HW referenced bit            */
124 #define _PAGE_FP_BIT            0x08    /* HW fetch protection bit      */
125 #define _PAGE_ACC_BITS          0xf0    /* HW access control bits       */
126 
127 struct page;
128 void arch_free_page(struct page *page, int order);
129 void arch_alloc_page(struct page *page, int order);
130 void arch_set_page_states(int make_stable);
131 
132 static inline int devmem_is_allowed(unsigned long pfn)
133 {
134         return 0;
135 }
136 
137 #define HAVE_ARCH_FREE_PAGE
138 #define HAVE_ARCH_ALLOC_PAGE
139 
140 #endif /* !__ASSEMBLY__ */
141 
142 #define __PAGE_OFFSET           0x0UL
143 #define PAGE_OFFSET             0x0UL
144 #define __pa(x)                 (unsigned long)(x)
145 #define __va(x)                 (void *)(unsigned long)(x)
146 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
147 #define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
148 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
149 
150 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | \
151                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
152 
153 #include <asm-generic/memory_model.h>
154 #include <asm-generic/getorder.h>
155 
156 #endif /* _S390_PAGE_H */
157 

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