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 unsigned long pfmf(unsigned long function, unsigned long address) 34 { 35 asm volatile( 36 " .insn rre,0xb9af0000,%[function],%[address]" 37 : [address] "+a" (address) 38 : [function] "d" (function) 39 : "memory"); 40 return address; 41 } 42 43 static inline void clear_page(void *page) 44 { 45 if (MACHINE_HAS_PFMF) { 46 pfmf(0x10000, (unsigned long)page); 47 } else { 48 register unsigned long reg1 asm ("1") = 0; 49 register void *reg2 asm ("2") = page; 50 register unsigned long reg3 asm ("3") = 4096; 51 asm volatile( 52 " mvcl 2,0" 53 : "+d" (reg2), "+d" (reg3) : "d" (reg1) 54 : "memory", "cc"); 55 } 56 } 57 58 static inline void copy_page(void *to, void *from) 59 { 60 if (MACHINE_HAS_MVPG) { 61 register unsigned long reg0 asm ("0") = 0; 62 asm volatile( 63 " mvpg %0,%1" 64 : : "a" (to), "a" (from), "d" (reg0) 65 : "memory", "cc"); 66 } else 67 asm volatile( 68 " mvc 0(256,%0),0(%1)\n" 69 " mvc 256(256,%0),256(%1)\n" 70 " mvc 512(256,%0),512(%1)\n" 71 " mvc 768(256,%0),768(%1)\n" 72 " mvc 1024(256,%0),1024(%1)\n" 73 " mvc 1280(256,%0),1280(%1)\n" 74 " mvc 1536(256,%0),1536(%1)\n" 75 " mvc 1792(256,%0),1792(%1)\n" 76 " mvc 2048(256,%0),2048(%1)\n" 77 " mvc 2304(256,%0),2304(%1)\n" 78 " mvc 2560(256,%0),2560(%1)\n" 79 " mvc 2816(256,%0),2816(%1)\n" 80 " mvc 3072(256,%0),3072(%1)\n" 81 " mvc 3328(256,%0),3328(%1)\n" 82 " mvc 3584(256,%0),3584(%1)\n" 83 " mvc 3840(256,%0),3840(%1)\n" 84 : : "a" (to), "a" (from) : "memory"); 85 } 86 87 #define clear_user_page(page, vaddr, pg) clear_page(page) 88 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 89 90 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \ 91 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr) 92 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 93 94 /* 95 * These are used to make use of C type-checking.. 96 */ 97 98 typedef struct { unsigned long pgprot; } pgprot_t; 99 typedef struct { unsigned long pgste; } pgste_t; 100 typedef struct { unsigned long pte; } pte_t; 101 typedef struct { unsigned long pmd; } pmd_t; 102 typedef struct { unsigned long pud; } pud_t; 103 typedef struct { unsigned long pgd; } pgd_t; 104 typedef pte_t *pgtable_t; 105 106 #define pgprot_val(x) ((x).pgprot) 107 #define pgste_val(x) ((x).pgste) 108 #define pte_val(x) ((x).pte) 109 #define pmd_val(x) ((x).pmd) 110 #define pud_val(x) ((x).pud) 111 #define pgd_val(x) ((x).pgd) 112 113 #define __pgste(x) ((pgste_t) { (x) } ) 114 #define __pte(x) ((pte_t) { (x) } ) 115 #define __pmd(x) ((pmd_t) { (x) } ) 116 #define __pud(x) ((pud_t) { (x) } ) 117 #define __pgd(x) ((pgd_t) { (x) } ) 118 #define __pgprot(x) ((pgprot_t) { (x) } ) 119 120 static inline void page_set_storage_key(unsigned long addr, 121 unsigned char skey, int mapped) 122 { 123 if (!mapped) 124 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 125 : : "d" (skey), "a" (addr)); 126 else 127 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 128 } 129 130 static inline unsigned char page_get_storage_key(unsigned long addr) 131 { 132 unsigned char skey; 133 134 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 135 return skey; 136 } 137 138 static inline int page_reset_referenced(unsigned long addr) 139 { 140 unsigned int ipm; 141 142 asm volatile( 143 " rrbe 0,%1\n" 144 " ipm %0\n" 145 : "=d" (ipm) : "a" (addr) : "cc"); 146 return !!(ipm & 0x20000000); 147 } 148 149 /* Bits int the storage key */ 150 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 151 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 152 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 153 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 154 155 /* 156 * Test and clear dirty bit in storage key. 157 * We can't clear the changed bit atomically. This is a potential 158 * race against modification of the referenced bit. This function 159 * should therefore only be called if it is not mapped in any 160 * address space. 161 */ 162 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY 163 static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped) 164 { 165 unsigned char skey; 166 167 skey = page_get_storage_key(pfn << PAGE_SHIFT); 168 if (!(skey & _PAGE_CHANGED)) 169 return 0; 170 page_set_storage_key(pfn << PAGE_SHIFT, skey & ~_PAGE_CHANGED, mapped); 171 return 1; 172 } 173 174 /* 175 * Test and clear referenced bit in storage key. 176 */ 177 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG 178 static inline int page_test_and_clear_young(unsigned long pfn) 179 { 180 return page_reset_referenced(pfn << PAGE_SHIFT); 181 } 182 183 struct page; 184 void arch_free_page(struct page *page, int order); 185 void arch_alloc_page(struct page *page, int order); 186 void arch_set_page_states(int make_stable); 187 188 static inline int devmem_is_allowed(unsigned long pfn) 189 { 190 return 0; 191 } 192 193 #define HAVE_ARCH_FREE_PAGE 194 #define HAVE_ARCH_ALLOC_PAGE 195 196 #endif /* !__ASSEMBLY__ */ 197 198 #define __PAGE_OFFSET 0x0UL 199 #define PAGE_OFFSET 0x0UL 200 #define __pa(x) (unsigned long)(x) 201 #define __va(x) (void *)(unsigned long)(x) 202 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 203 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 204 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 205 206 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 207 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 208 209 #include <asm-generic/memory_model.h> 210 #include <asm-generic/getorder.h> 211 212 #define __HAVE_ARCH_GATE_AREA 1 213 214 #endif /* _S390_PAGE_H */ 215