1 /* 2 * include/asm-s390/page.h 3 * 4 * S390 version 5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Hartmut Penner (hp@de.ibm.com) 7 */ 8 9 #ifndef _S390_PAGE_H 10 #define _S390_PAGE_H 11 12 #include <linux/const.h> 13 #include <asm/types.h> 14 15 /* PAGE_SHIFT determines the page size */ 16 #define PAGE_SHIFT 12 17 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) 18 #define PAGE_MASK (~(PAGE_SIZE-1)) 19 #define PAGE_DEFAULT_ACC 0 20 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) 21 22 #define HPAGE_SHIFT 20 23 #define HPAGE_SIZE (1UL << HPAGE_SHIFT) 24 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 25 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 26 27 #define ARCH_HAS_SETCLEAR_HUGE_PTE 28 #define ARCH_HAS_HUGE_PTE_TYPE 29 #define ARCH_HAS_PREPARE_HUGEPAGE 30 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH 31 32 #include <asm/setup.h> 33 #ifndef __ASSEMBLY__ 34 35 static inline void clear_page(void *page) 36 { 37 if (MACHINE_HAS_PFMF) { 38 asm volatile( 39 " .insn rre,0xb9af0000,%0,%1" 40 : : "d" (0x10000), "a" (page) : "memory", "cc"); 41 } else { 42 register unsigned long reg1 asm ("1") = 0; 43 register void *reg2 asm ("2") = page; 44 register unsigned long reg3 asm ("3") = 4096; 45 asm volatile( 46 " mvcl 2,0" 47 : "+d" (reg2), "+d" (reg3) : "d" (reg1) 48 : "memory", "cc"); 49 } 50 } 51 52 static inline void copy_page(void *to, void *from) 53 { 54 if (MACHINE_HAS_MVPG) { 55 register unsigned long reg0 asm ("0") = 0; 56 asm volatile( 57 " mvpg %0,%1" 58 : : "a" (to), "a" (from), "d" (reg0) 59 : "memory", "cc"); 60 } else 61 asm volatile( 62 " mvc 0(256,%0),0(%1)\n" 63 " mvc 256(256,%0),256(%1)\n" 64 " mvc 512(256,%0),512(%1)\n" 65 " mvc 768(256,%0),768(%1)\n" 66 " mvc 1024(256,%0),1024(%1)\n" 67 " mvc 1280(256,%0),1280(%1)\n" 68 " mvc 1536(256,%0),1536(%1)\n" 69 " mvc 1792(256,%0),1792(%1)\n" 70 " mvc 2048(256,%0),2048(%1)\n" 71 " mvc 2304(256,%0),2304(%1)\n" 72 " mvc 2560(256,%0),2560(%1)\n" 73 " mvc 2816(256,%0),2816(%1)\n" 74 " mvc 3072(256,%0),3072(%1)\n" 75 " mvc 3328(256,%0),3328(%1)\n" 76 " mvc 3584(256,%0),3584(%1)\n" 77 " mvc 3840(256,%0),3840(%1)\n" 78 : : "a" (to), "a" (from) : "memory"); 79 } 80 81 #define clear_user_page(page, vaddr, pg) clear_page(page) 82 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 83 84 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \ 85 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr) 86 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 87 88 /* 89 * These are used to make use of C type-checking.. 90 */ 91 92 typedef struct { unsigned long pgprot; } pgprot_t; 93 typedef struct { unsigned long pgste; } pgste_t; 94 typedef struct { unsigned long pte; } pte_t; 95 typedef struct { unsigned long pmd; } pmd_t; 96 typedef struct { unsigned long pud; } pud_t; 97 typedef struct { unsigned long pgd; } pgd_t; 98 typedef pte_t *pgtable_t; 99 100 #define pgprot_val(x) ((x).pgprot) 101 #define pgste_val(x) ((x).pgste) 102 #define pte_val(x) ((x).pte) 103 #define pmd_val(x) ((x).pmd) 104 #define pud_val(x) ((x).pud) 105 #define pgd_val(x) ((x).pgd) 106 107 #define __pgste(x) ((pgste_t) { (x) } ) 108 #define __pte(x) ((pte_t) { (x) } ) 109 #define __pmd(x) ((pmd_t) { (x) } ) 110 #define __pud(x) ((pud_t) { (x) } ) 111 #define __pgd(x) ((pgd_t) { (x) } ) 112 #define __pgprot(x) ((pgprot_t) { (x) } ) 113 114 static inline void page_set_storage_key(unsigned long addr, 115 unsigned char skey, int mapped) 116 { 117 if (!mapped) 118 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 119 : : "d" (skey), "a" (addr)); 120 else 121 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 122 } 123 124 static inline unsigned char page_get_storage_key(unsigned long addr) 125 { 126 unsigned char skey; 127 128 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 129 return skey; 130 } 131 132 static inline int page_reset_referenced(unsigned long addr) 133 { 134 unsigned int ipm; 135 136 asm volatile( 137 " rrbe 0,%1\n" 138 " ipm %0\n" 139 : "=d" (ipm) : "a" (addr) : "cc"); 140 return !!(ipm & 0x20000000); 141 } 142 143 /* Bits int the storage key */ 144 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 145 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 146 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 147 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 148 149 /* 150 * Test and clear dirty bit in storage key. 151 * We can't clear the changed bit atomically. This is a potential 152 * race against modification of the referenced bit. This function 153 * should therefore only be called if it is not mapped in any 154 * address space. 155 */ 156 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY 157 static inline int page_test_and_clear_dirty(unsigned long pfn, int mapped) 158 { 159 unsigned char skey; 160 161 skey = page_get_storage_key(pfn << PAGE_SHIFT); 162 if (!(skey & _PAGE_CHANGED)) 163 return 0; 164 page_set_storage_key(pfn << PAGE_SHIFT, skey & ~_PAGE_CHANGED, mapped); 165 return 1; 166 } 167 168 /* 169 * Test and clear referenced bit in storage key. 170 */ 171 #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG 172 static inline int page_test_and_clear_young(unsigned long pfn) 173 { 174 return page_reset_referenced(pfn << PAGE_SHIFT); 175 } 176 177 struct page; 178 void arch_free_page(struct page *page, int order); 179 void arch_alloc_page(struct page *page, int order); 180 181 static inline int devmem_is_allowed(unsigned long pfn) 182 { 183 return 0; 184 } 185 186 #define HAVE_ARCH_FREE_PAGE 187 #define HAVE_ARCH_ALLOC_PAGE 188 189 #endif /* !__ASSEMBLY__ */ 190 191 #define __PAGE_OFFSET 0x0UL 192 #define PAGE_OFFSET 0x0UL 193 #define __pa(x) (unsigned long)(x) 194 #define __va(x) (void *)(unsigned long)(x) 195 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 196 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 197 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 198 199 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 200 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 201 202 #include <asm-generic/memory_model.h> 203 #include <asm-generic/getorder.h> 204 205 #define __HAVE_ARCH_GATE_AREA 1 206 207 #endif /* _S390_PAGE_H */ 208