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 void storage_key_init_range(unsigned long start, unsigned long end); 34 35 static unsigned long pfmf(unsigned long function, unsigned long address) 36 { 37 asm volatile( 38 " .insn rre,0xb9af0000,%[function],%[address]" 39 : [address] "+a" (address) 40 : [function] "d" (function) 41 : "memory"); 42 return address; 43 } 44 45 static inline void clear_page(void *page) 46 { 47 if (MACHINE_HAS_PFMF) { 48 pfmf(0x10000, (unsigned long)page); 49 } else { 50 register unsigned long reg1 asm ("1") = 0; 51 register void *reg2 asm ("2") = page; 52 register unsigned long reg3 asm ("3") = 4096; 53 asm volatile( 54 " mvcl 2,0" 55 : "+d" (reg2), "+d" (reg3) : "d" (reg1) 56 : "memory", "cc"); 57 } 58 } 59 60 static inline void copy_page(void *to, void *from) 61 { 62 if (MACHINE_HAS_MVPG) { 63 register unsigned long reg0 asm ("0") = 0; 64 asm volatile( 65 " mvpg %0,%1" 66 : : "a" (to), "a" (from), "d" (reg0) 67 : "memory", "cc"); 68 } else 69 asm volatile( 70 " mvc 0(256,%0),0(%1)\n" 71 " mvc 256(256,%0),256(%1)\n" 72 " mvc 512(256,%0),512(%1)\n" 73 " mvc 768(256,%0),768(%1)\n" 74 " mvc 1024(256,%0),1024(%1)\n" 75 " mvc 1280(256,%0),1280(%1)\n" 76 " mvc 1536(256,%0),1536(%1)\n" 77 " mvc 1792(256,%0),1792(%1)\n" 78 " mvc 2048(256,%0),2048(%1)\n" 79 " mvc 2304(256,%0),2304(%1)\n" 80 " mvc 2560(256,%0),2560(%1)\n" 81 " mvc 2816(256,%0),2816(%1)\n" 82 " mvc 3072(256,%0),3072(%1)\n" 83 " mvc 3328(256,%0),3328(%1)\n" 84 " mvc 3584(256,%0),3584(%1)\n" 85 " mvc 3840(256,%0),3840(%1)\n" 86 : : "a" (to), "a" (from) : "memory"); 87 } 88 89 #define clear_user_page(page, vaddr, pg) clear_page(page) 90 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 91 92 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \ 93 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr) 94 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 95 96 /* 97 * These are used to make use of C type-checking.. 98 */ 99 100 typedef struct { unsigned long pgprot; } pgprot_t; 101 typedef struct { unsigned long pgste; } pgste_t; 102 typedef struct { unsigned long pte; } pte_t; 103 typedef struct { unsigned long pmd; } pmd_t; 104 typedef struct { unsigned long pud; } pud_t; 105 typedef struct { unsigned long pgd; } pgd_t; 106 typedef pte_t *pgtable_t; 107 108 #define pgprot_val(x) ((x).pgprot) 109 #define pgste_val(x) ((x).pgste) 110 #define pte_val(x) ((x).pte) 111 #define pmd_val(x) ((x).pmd) 112 #define pud_val(x) ((x).pud) 113 #define pgd_val(x) ((x).pgd) 114 115 #define __pgste(x) ((pgste_t) { (x) } ) 116 #define __pte(x) ((pte_t) { (x) } ) 117 #define __pmd(x) ((pmd_t) { (x) } ) 118 #define __pud(x) ((pud_t) { (x) } ) 119 #define __pgd(x) ((pgd_t) { (x) } ) 120 #define __pgprot(x) ((pgprot_t) { (x) } ) 121 122 static inline void page_set_storage_key(unsigned long addr, 123 unsigned char skey, int mapped) 124 { 125 if (!mapped) 126 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 127 : : "d" (skey), "a" (addr)); 128 else 129 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 130 } 131 132 static inline unsigned char page_get_storage_key(unsigned long addr) 133 { 134 unsigned char skey; 135 136 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 137 return skey; 138 } 139 140 static inline int page_reset_referenced(unsigned long addr) 141 { 142 unsigned int ipm; 143 144 asm volatile( 145 " rrbe 0,%1\n" 146 " ipm %0\n" 147 : "=d" (ipm) : "a" (addr) : "cc"); 148 return !!(ipm & 0x20000000); 149 } 150 151 /* Bits int the storage key */ 152 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 153 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 154 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 155 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 156 157 /* 158 * Test and clear dirty bit in storage key. 159 * We can't clear the changed bit atomically. This is a potential 160 * race against modification of the referenced bit. This function 161 * should therefore only be called if it is not mapped in any 162 * address space. 163 * 164 * Note that the bit gets set whenever page content is changed. That means 165 * also when the page is modified by DMA or from inside the kernel. 166 */ 167 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY 168 static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped) 169 { 170 unsigned char skey; 171 172 skey = page_get_storage_key(pfn << PAGE_SHIFT); 173 if (!(skey & _PAGE_CHANGED)) 174 return 0; 175 page_set_storage_key(pfn << PAGE_SHIFT, skey & ~_PAGE_CHANGED, mapped); 176 return 1; 177 } 178 179 /* 180 * Test and clear referenced bit in storage key. 181 */ 182 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG 183 static inline int page_test_and_clear_young(unsigned long pfn) 184 { 185 return page_reset_referenced(pfn << PAGE_SHIFT); 186 } 187 188 struct page; 189 void arch_free_page(struct page *page, int order); 190 void arch_alloc_page(struct page *page, int order); 191 void arch_set_page_states(int make_stable); 192 193 static inline int devmem_is_allowed(unsigned long pfn) 194 { 195 return 0; 196 } 197 198 #define HAVE_ARCH_FREE_PAGE 199 #define HAVE_ARCH_ALLOC_PAGE 200 201 #endif /* !__ASSEMBLY__ */ 202 203 #define __PAGE_OFFSET 0x0UL 204 #define PAGE_OFFSET 0x0UL 205 #define __pa(x) (unsigned long)(x) 206 #define __va(x) (void *)(unsigned long)(x) 207 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 208 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 209 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 210 211 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 212 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 213 214 #include <asm-generic/memory_model.h> 215 #include <asm-generic/getorder.h> 216 217 #define __HAVE_ARCH_GATE_AREA 1 218 219 #endif /* _S390_PAGE_H */ 220