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 vma_alloc_zeroed_movable_folio(vma, vaddr) \ 77 vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false) 78 79 /* 80 * These are used to make use of C type-checking.. 81 */ 82 83 typedef struct { unsigned long pgprot; } pgprot_t; 84 typedef struct { unsigned long pgste; } pgste_t; 85 typedef struct { unsigned long pte; } pte_t; 86 typedef struct { unsigned long pmd; } pmd_t; 87 typedef struct { unsigned long pud; } pud_t; 88 typedef struct { unsigned long p4d; } p4d_t; 89 typedef struct { unsigned long pgd; } pgd_t; 90 typedef pte_t *pgtable_t; 91 92 #define pgprot_val(x) ((x).pgprot) 93 #define pgste_val(x) ((x).pgste) 94 95 static inline unsigned long pte_val(pte_t pte) 96 { 97 return pte.pte; 98 } 99 100 static inline unsigned long pmd_val(pmd_t pmd) 101 { 102 return pmd.pmd; 103 } 104 105 static inline unsigned long pud_val(pud_t pud) 106 { 107 return pud.pud; 108 } 109 110 static inline unsigned long p4d_val(p4d_t p4d) 111 { 112 return p4d.p4d; 113 } 114 115 static inline unsigned long pgd_val(pgd_t pgd) 116 { 117 return pgd.pgd; 118 } 119 120 #define __pgste(x) ((pgste_t) { (x) } ) 121 #define __pte(x) ((pte_t) { (x) } ) 122 #define __pmd(x) ((pmd_t) { (x) } ) 123 #define __pud(x) ((pud_t) { (x) } ) 124 #define __p4d(x) ((p4d_t) { (x) } ) 125 #define __pgd(x) ((pgd_t) { (x) } ) 126 #define __pgprot(x) ((pgprot_t) { (x) } ) 127 128 static inline void page_set_storage_key(unsigned long addr, 129 unsigned char skey, int mapped) 130 { 131 if (!mapped) 132 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 133 : : "d" (skey), "a" (addr)); 134 else 135 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 136 } 137 138 static inline unsigned char page_get_storage_key(unsigned long addr) 139 { 140 unsigned char skey; 141 142 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 143 return skey; 144 } 145 146 static inline int page_reset_referenced(unsigned long addr) 147 { 148 int cc; 149 150 asm volatile( 151 " rrbe 0,%1\n" 152 " ipm %0\n" 153 " srl %0,28\n" 154 : "=d" (cc) : "a" (addr) : "cc"); 155 return cc; 156 } 157 158 /* Bits int the storage key */ 159 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 160 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 161 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 162 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 163 164 struct page; 165 void arch_free_page(struct page *page, int order); 166 void arch_alloc_page(struct page *page, int order); 167 void arch_set_page_dat(struct page *page, int order); 168 169 static inline int devmem_is_allowed(unsigned long pfn) 170 { 171 return 0; 172 } 173 174 #define HAVE_ARCH_FREE_PAGE 175 #define HAVE_ARCH_ALLOC_PAGE 176 177 #if IS_ENABLED(CONFIG_PGSTE) 178 int arch_make_page_accessible(struct page *page); 179 #define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE 180 #endif 181 182 #endif /* !__ASSEMBLY__ */ 183 184 #define __PAGE_OFFSET 0x0UL 185 #define PAGE_OFFSET 0x0UL 186 187 #define __pa(x) ((unsigned long)(x)) 188 #define __va(x) ((void *)(unsigned long)(x)) 189 190 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT) 191 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 192 193 #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys)) 194 #define page_to_phys(page) pfn_to_phys(page_to_pfn(page)) 195 196 #define pfn_to_virt(pfn) __va(pfn_to_phys(pfn)) 197 #define virt_to_pfn(kaddr) (phys_to_pfn(__pa(kaddr))) 198 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn) 199 200 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 201 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 202 203 #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr)) 204 205 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 206 207 #include <asm-generic/memory_model.h> 208 #include <asm-generic/getorder.h> 209 210 #endif /* _S390_PAGE_H */ 211