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 clear_page(void *page) 34 { 35 if (MACHINE_HAS_PFMF) { 36 asm volatile( 37 " .insn rre,0xb9af0000,%0,%1" 38 : : "d" (0x10000), "a" (page) : "memory", "cc"); 39 } else { 40 register unsigned long reg1 asm ("1") = 0; 41 register void *reg2 asm ("2") = page; 42 register unsigned long reg3 asm ("3") = 4096; 43 asm volatile( 44 " mvcl 2,0" 45 : "+d" (reg2), "+d" (reg3) : "d" (reg1) 46 : "memory", "cc"); 47 } 48 } 49 50 static inline void copy_page(void *to, void *from) 51 { 52 if (MACHINE_HAS_MVPG) { 53 register unsigned long reg0 asm ("0") = 0; 54 asm volatile( 55 " mvpg %0,%1" 56 : : "a" (to), "a" (from), "d" (reg0) 57 : "memory", "cc"); 58 } else 59 asm volatile( 60 " mvc 0(256,%0),0(%1)\n" 61 " mvc 256(256,%0),256(%1)\n" 62 " mvc 512(256,%0),512(%1)\n" 63 " mvc 768(256,%0),768(%1)\n" 64 " mvc 1024(256,%0),1024(%1)\n" 65 " mvc 1280(256,%0),1280(%1)\n" 66 " mvc 1536(256,%0),1536(%1)\n" 67 " mvc 1792(256,%0),1792(%1)\n" 68 " mvc 2048(256,%0),2048(%1)\n" 69 " mvc 2304(256,%0),2304(%1)\n" 70 " mvc 2560(256,%0),2560(%1)\n" 71 " mvc 2816(256,%0),2816(%1)\n" 72 " mvc 3072(256,%0),3072(%1)\n" 73 " mvc 3328(256,%0),3328(%1)\n" 74 " mvc 3584(256,%0),3584(%1)\n" 75 " mvc 3840(256,%0),3840(%1)\n" 76 : : "a" (to), "a" (from) : "memory"); 77 } 78 79 #define clear_user_page(page, vaddr, pg) clear_page(page) 80 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 81 82 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \ 83 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr) 84 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 85 86 /* 87 * These are used to make use of C type-checking.. 88 */ 89 90 typedef struct { unsigned long pgprot; } pgprot_t; 91 typedef struct { unsigned long pgste; } pgste_t; 92 typedef struct { unsigned long pte; } pte_t; 93 typedef struct { unsigned long pmd; } pmd_t; 94 typedef struct { unsigned long pud; } pud_t; 95 typedef struct { unsigned long pgd; } pgd_t; 96 typedef pte_t *pgtable_t; 97 98 #define pgprot_val(x) ((x).pgprot) 99 #define pgste_val(x) ((x).pgste) 100 #define pte_val(x) ((x).pte) 101 #define pmd_val(x) ((x).pmd) 102 #define pud_val(x) ((x).pud) 103 #define pgd_val(x) ((x).pgd) 104 105 #define __pgste(x) ((pgste_t) { (x) } ) 106 #define __pte(x) ((pte_t) { (x) } ) 107 #define __pmd(x) ((pmd_t) { (x) } ) 108 #define __pud(x) ((pud_t) { (x) } ) 109 #define __pgd(x) ((pgd_t) { (x) } ) 110 #define __pgprot(x) ((pgprot_t) { (x) } ) 111 112 static inline void page_set_storage_key(unsigned long addr, 113 unsigned char skey, int mapped) 114 { 115 if (!mapped) 116 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 117 : : "d" (skey), "a" (addr)); 118 else 119 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 120 } 121 122 static inline unsigned char page_get_storage_key(unsigned long addr) 123 { 124 unsigned char skey; 125 126 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 127 return skey; 128 } 129 130 static inline int page_reset_referenced(unsigned long addr) 131 { 132 unsigned int ipm; 133 134 asm volatile( 135 " rrbe 0,%1\n" 136 " ipm %0\n" 137 : "=d" (ipm) : "a" (addr) : "cc"); 138 return !!(ipm & 0x20000000); 139 } 140 141 /* Bits int the storage key */ 142 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 143 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 144 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 145 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 146 147 /* 148 * Test and clear dirty bit in storage key. 149 * We can't clear the changed bit atomically. This is a potential 150 * race against modification of the referenced bit. This function 151 * should therefore only be called if it is not mapped in any 152 * address space. 153 */ 154 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY 155 static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped) 156 { 157 unsigned char skey; 158 159 skey = page_get_storage_key(pfn << PAGE_SHIFT); 160 if (!(skey & _PAGE_CHANGED)) 161 return 0; 162 page_set_storage_key(pfn << PAGE_SHIFT, skey & ~_PAGE_CHANGED, mapped); 163 return 1; 164 } 165 166 /* 167 * Test and clear referenced bit in storage key. 168 */ 169 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG 170 static inline int page_test_and_clear_young(unsigned long pfn) 171 { 172 return page_reset_referenced(pfn << PAGE_SHIFT); 173 } 174 175 struct page; 176 void arch_free_page(struct page *page, int order); 177 void arch_alloc_page(struct page *page, int order); 178 void arch_set_page_states(int make_stable); 179 180 static inline int devmem_is_allowed(unsigned long pfn) 181 { 182 return 0; 183 } 184 185 #define HAVE_ARCH_FREE_PAGE 186 #define HAVE_ARCH_ALLOC_PAGE 187 188 #endif /* !__ASSEMBLY__ */ 189 190 #define __PAGE_OFFSET 0x0UL 191 #define PAGE_OFFSET 0x0UL 192 #define __pa(x) (unsigned long)(x) 193 #define __va(x) (void *)(unsigned long)(x) 194 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 195 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 196 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 197 198 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 199 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 200 201 #include <asm-generic/memory_model.h> 202 #include <asm-generic/getorder.h> 203 204 #define __HAVE_ARCH_GATE_AREA 1 205 206 #endif /* _S390_PAGE_H */ 207