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 #define _PAGE_SHIFT 12 14 #define _PAGE_SIZE (_AC(1, UL) << _PAGE_SHIFT) 15 #define _PAGE_MASK (~(_PAGE_SIZE - 1)) 16 17 /* PAGE_SHIFT determines the page size */ 18 #define PAGE_SHIFT _PAGE_SHIFT 19 #define PAGE_SIZE _PAGE_SIZE 20 #define PAGE_MASK _PAGE_MASK 21 #define PAGE_DEFAULT_ACC 0 22 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) 23 24 #define HPAGE_SHIFT 20 25 #define HPAGE_SIZE (1UL << HPAGE_SHIFT) 26 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 27 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 28 #define HUGE_MAX_HSTATE 2 29 30 #define ARCH_HAS_SETCLEAR_HUGE_PTE 31 #define ARCH_HAS_HUGE_PTE_TYPE 32 #define ARCH_HAS_PREPARE_HUGEPAGE 33 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH 34 35 #include <asm/setup.h> 36 #ifndef __ASSEMBLY__ 37 38 void __storage_key_init_range(unsigned long start, unsigned long end); 39 40 static inline void storage_key_init_range(unsigned long start, unsigned long end) 41 { 42 if (PAGE_DEFAULT_KEY) 43 __storage_key_init_range(start, end); 44 } 45 46 #define clear_page(page) memset((page), 0, PAGE_SIZE) 47 48 /* 49 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to 50 * bypass caches when copying a page. Especially when copying huge pages 51 * this keeps L1 and L2 data caches alive. 52 */ 53 static inline void copy_page(void *to, void *from) 54 { 55 register void *reg2 asm ("2") = to; 56 register unsigned long reg3 asm ("3") = 0x1000; 57 register void *reg4 asm ("4") = from; 58 register unsigned long reg5 asm ("5") = 0xb0001000; 59 asm volatile( 60 " mvcl 2,4" 61 : "+d" (reg2), "+d" (reg3), "+d" (reg4), "+d" (reg5) 62 : : "memory", "cc"); 63 } 64 65 #define clear_user_page(page, vaddr, pg) clear_page(page) 66 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 67 68 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \ 69 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr) 70 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 71 72 /* 73 * These are used to make use of C type-checking.. 74 */ 75 76 typedef struct { unsigned long pgprot; } pgprot_t; 77 typedef struct { unsigned long pgste; } pgste_t; 78 typedef struct { unsigned long pte; } pte_t; 79 typedef struct { unsigned long pmd; } pmd_t; 80 typedef struct { unsigned long pud; } pud_t; 81 typedef struct { unsigned long p4d; } p4d_t; 82 typedef struct { unsigned long pgd; } pgd_t; 83 typedef pte_t *pgtable_t; 84 85 #define pgprot_val(x) ((x).pgprot) 86 #define pgste_val(x) ((x).pgste) 87 #define pte_val(x) ((x).pte) 88 #define pmd_val(x) ((x).pmd) 89 #define pud_val(x) ((x).pud) 90 #define p4d_val(x) ((x).p4d) 91 #define pgd_val(x) ((x).pgd) 92 93 #define __pgste(x) ((pgste_t) { (x) } ) 94 #define __pte(x) ((pte_t) { (x) } ) 95 #define __pmd(x) ((pmd_t) { (x) } ) 96 #define __pud(x) ((pud_t) { (x) } ) 97 #define __p4d(x) ((p4d_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 int cc; 122 123 asm volatile( 124 " rrbe 0,%1\n" 125 " ipm %0\n" 126 " srl %0,28\n" 127 : "=d" (cc) : "a" (addr) : "cc"); 128 return cc; 129 } 130 131 /* Bits int the storage key */ 132 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 133 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 134 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 135 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 136 137 struct page; 138 void arch_free_page(struct page *page, int order); 139 void arch_alloc_page(struct page *page, int order); 140 void arch_set_page_dat(struct page *page, int order); 141 void arch_set_page_nodat(struct page *page, int order); 142 int arch_test_page_nodat(struct page *page); 143 void arch_set_page_states(int make_stable); 144 145 static inline int devmem_is_allowed(unsigned long pfn) 146 { 147 return 0; 148 } 149 150 #define HAVE_ARCH_FREE_PAGE 151 #define HAVE_ARCH_ALLOC_PAGE 152 153 #endif /* !__ASSEMBLY__ */ 154 155 #define __PAGE_OFFSET 0x0UL 156 #define PAGE_OFFSET 0x0UL 157 #define __pa(x) (unsigned long)(x) 158 #define __va(x) (void *)(unsigned long)(x) 159 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 160 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 161 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 162 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) 163 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 164 165 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 166 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 167 168 #include <asm-generic/memory_model.h> 169 #include <asm-generic/getorder.h> 170 171 #endif /* _S390_PAGE_H */ 172