1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * S390 version 4 * Copyright IBM Corp. 1999, 2000 5 * Author(s): Hartmut Penner (hp@de.ibm.com) 6 */ 7 8 #ifndef _S390_PAGE_H 9 #define _S390_PAGE_H 10 11 #include <linux/const.h> 12 #include <asm/types.h> 13 14 #define _PAGE_SHIFT 12 15 #define _PAGE_SIZE (_AC(1, UL) << _PAGE_SHIFT) 16 #define _PAGE_MASK (~(_PAGE_SIZE - 1)) 17 18 /* PAGE_SHIFT determines the page size */ 19 #define PAGE_SHIFT _PAGE_SHIFT 20 #define PAGE_SIZE _PAGE_SIZE 21 #define PAGE_MASK _PAGE_MASK 22 #define PAGE_DEFAULT_ACC 0 23 /* storage-protection override */ 24 #define PAGE_SPO_ACC 9 25 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) 26 27 #define HPAGE_SHIFT 20 28 #define HPAGE_SIZE (1UL << HPAGE_SHIFT) 29 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 30 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 31 #define HUGE_MAX_HSTATE 2 32 33 #define ARCH_HAS_SETCLEAR_HUGE_PTE 34 #define ARCH_HAS_HUGE_PTE_TYPE 35 #define ARCH_HAS_PREPARE_HUGEPAGE 36 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH 37 38 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 39 40 #include <asm/setup.h> 41 #ifndef __ASSEMBLY__ 42 43 void __storage_key_init_range(unsigned long start, unsigned long end); 44 45 static inline void storage_key_init_range(unsigned long start, unsigned long end) 46 { 47 if (PAGE_DEFAULT_KEY != 0) 48 __storage_key_init_range(start, end); 49 } 50 51 #define clear_page(page) memset((page), 0, PAGE_SIZE) 52 53 /* 54 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to 55 * bypass caches when copying a page. Especially when copying huge pages 56 * this keeps L1 and L2 data caches alive. 57 */ 58 static inline void copy_page(void *to, void *from) 59 { 60 union register_pair dst, src; 61 62 dst.even = (unsigned long) to; 63 dst.odd = 0x1000; 64 src.even = (unsigned long) from; 65 src.odd = 0xb0001000; 66 67 asm volatile( 68 " mvcl %[dst],%[src]" 69 : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair) 70 : : "memory", "cc"); 71 } 72 73 #define clear_user_page(page, vaddr, pg) clear_page(page) 74 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 75 76 #define alloc_zeroed_user_highpage_movable(vma, vaddr) \ 77 alloc_page_vma(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, vma, vaddr) 78 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE_MOVABLE 79 80 /* 81 * These are used to make use of C type-checking.. 82 */ 83 84 typedef struct { unsigned long pgprot; } pgprot_t; 85 typedef struct { unsigned long pgste; } pgste_t; 86 typedef struct { unsigned long pte; } pte_t; 87 typedef struct { unsigned long pmd; } pmd_t; 88 typedef struct { unsigned long pud; } pud_t; 89 typedef struct { unsigned long p4d; } p4d_t; 90 typedef struct { unsigned long pgd; } pgd_t; 91 typedef pte_t *pgtable_t; 92 93 #define pgprot_val(x) ((x).pgprot) 94 #define pgste_val(x) ((x).pgste) 95 96 static inline unsigned long pte_val(pte_t pte) 97 { 98 return pte.pte; 99 } 100 101 static inline unsigned long pmd_val(pmd_t pmd) 102 { 103 return pmd.pmd; 104 } 105 106 static inline unsigned long pud_val(pud_t pud) 107 { 108 return pud.pud; 109 } 110 111 static inline unsigned long p4d_val(p4d_t p4d) 112 { 113 return p4d.p4d; 114 } 115 116 static inline unsigned long pgd_val(pgd_t pgd) 117 { 118 return pgd.pgd; 119 } 120 121 #define __pgste(x) ((pgste_t) { (x) } ) 122 #define __pte(x) ((pte_t) { (x) } ) 123 #define __pmd(x) ((pmd_t) { (x) } ) 124 #define __pud(x) ((pud_t) { (x) } ) 125 #define __p4d(x) ((p4d_t) { (x) } ) 126 #define __pgd(x) ((pgd_t) { (x) } ) 127 #define __pgprot(x) ((pgprot_t) { (x) } ) 128 129 static inline void page_set_storage_key(unsigned long addr, 130 unsigned char skey, int mapped) 131 { 132 if (!mapped) 133 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 134 : : "d" (skey), "a" (addr)); 135 else 136 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 137 } 138 139 static inline unsigned char page_get_storage_key(unsigned long addr) 140 { 141 unsigned char skey; 142 143 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 144 return skey; 145 } 146 147 static inline int page_reset_referenced(unsigned long addr) 148 { 149 int cc; 150 151 asm volatile( 152 " rrbe 0,%1\n" 153 " ipm %0\n" 154 " srl %0,28\n" 155 : "=d" (cc) : "a" (addr) : "cc"); 156 return cc; 157 } 158 159 /* Bits int the storage key */ 160 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 161 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 162 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 163 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 164 165 struct page; 166 void arch_free_page(struct page *page, int order); 167 void arch_alloc_page(struct page *page, int order); 168 void arch_set_page_dat(struct page *page, int order); 169 170 static inline int devmem_is_allowed(unsigned long pfn) 171 { 172 return 0; 173 } 174 175 #define HAVE_ARCH_FREE_PAGE 176 #define HAVE_ARCH_ALLOC_PAGE 177 178 #if IS_ENABLED(CONFIG_PGSTE) 179 int arch_make_page_accessible(struct page *page); 180 #define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE 181 #endif 182 183 #endif /* !__ASSEMBLY__ */ 184 185 #define __PAGE_OFFSET 0x0UL 186 #define PAGE_OFFSET 0x0UL 187 188 #define __pa(x) ((unsigned long)(x)) 189 #define __va(x) ((void *)(unsigned long)(x)) 190 191 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT) 192 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 193 194 #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys)) 195 #define page_to_phys(page) pfn_to_phys(page_to_pfn(page)) 196 197 #define pfn_to_virt(pfn) __va(pfn_to_phys(pfn)) 198 #define virt_to_pfn(kaddr) (phys_to_pfn(__pa(kaddr))) 199 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn) 200 201 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 202 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 203 204 #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr)) 205 206 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 207 208 #include <asm-generic/memory_model.h> 209 #include <asm-generic/getorder.h> 210 211 #endif /* _S390_PAGE_H */ 212