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 #include <vdso/page.h> 15 16 #define PAGE_DEFAULT_ACC _AC(0, UL) 17 /* storage-protection override */ 18 #define PAGE_SPO_ACC 9 19 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) 20 21 #define HPAGE_SHIFT 20 22 #define HPAGE_SIZE (1UL << HPAGE_SHIFT) 23 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 24 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 25 #define HUGE_MAX_HSTATE 2 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 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 33 34 #include <asm/setup.h> 35 #ifndef __ASSEMBLY__ 36 37 void __storage_key_init_range(unsigned long start, unsigned long end); 38 39 static inline void storage_key_init_range(unsigned long start, unsigned long end) 40 { 41 if (PAGE_DEFAULT_KEY != 0) 42 __storage_key_init_range(start, end); 43 } 44 45 #define clear_page(page) memset((page), 0, PAGE_SIZE) 46 47 /* 48 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to 49 * bypass caches when copying a page. Especially when copying huge pages 50 * this keeps L1 and L2 data caches alive. 51 */ 52 static inline void copy_page(void *to, void *from) 53 { 54 union register_pair dst, src; 55 56 dst.even = (unsigned long) to; 57 dst.odd = 0x1000; 58 src.even = (unsigned long) from; 59 src.odd = 0xb0001000; 60 61 asm volatile( 62 " mvcl %[dst],%[src]" 63 : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair) 64 : : "memory", "cc"); 65 } 66 67 #define clear_user_page(page, vaddr, pg) clear_page(page) 68 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 69 70 #define vma_alloc_zeroed_movable_folio(vma, vaddr) \ 71 vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false) 72 73 /* 74 * These are used to make use of C type-checking.. 75 */ 76 77 typedef struct { unsigned long pgprot; } pgprot_t; 78 typedef struct { unsigned long pgste; } pgste_t; 79 typedef struct { unsigned long pte; } pte_t; 80 typedef struct { unsigned long pmd; } pmd_t; 81 typedef struct { unsigned long pud; } pud_t; 82 typedef struct { unsigned long p4d; } p4d_t; 83 typedef struct { unsigned long pgd; } pgd_t; 84 typedef pte_t *pgtable_t; 85 86 #define pgprot_val(x) ((x).pgprot) 87 #define pgste_val(x) ((x).pgste) 88 89 static inline unsigned long pte_val(pte_t pte) 90 { 91 return pte.pte; 92 } 93 94 static inline unsigned long pmd_val(pmd_t pmd) 95 { 96 return pmd.pmd; 97 } 98 99 static inline unsigned long pud_val(pud_t pud) 100 { 101 return pud.pud; 102 } 103 104 static inline unsigned long p4d_val(p4d_t p4d) 105 { 106 return p4d.p4d; 107 } 108 109 static inline unsigned long pgd_val(pgd_t pgd) 110 { 111 return pgd.pgd; 112 } 113 114 #define __pgste(x) ((pgste_t) { (x) } ) 115 #define __pte(x) ((pte_t) { (x) } ) 116 #define __pmd(x) ((pmd_t) { (x) } ) 117 #define __pud(x) ((pud_t) { (x) } ) 118 #define __p4d(x) ((p4d_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 int cc; 143 144 asm volatile( 145 " rrbe 0,%1\n" 146 " ipm %0\n" 147 " srl %0,28\n" 148 : "=d" (cc) : "a" (addr) : "cc"); 149 return cc; 150 } 151 152 /* Bits int the storage key */ 153 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 154 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 155 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 156 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 157 158 struct page; 159 struct folio; 160 void arch_free_page(struct page *page, int order); 161 void arch_alloc_page(struct page *page, int order); 162 163 static inline int devmem_is_allowed(unsigned long pfn) 164 { 165 return 0; 166 } 167 168 #define HAVE_ARCH_FREE_PAGE 169 #define HAVE_ARCH_ALLOC_PAGE 170 171 int arch_make_folio_accessible(struct folio *folio); 172 #define HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE 173 174 struct vm_layout { 175 unsigned long kaslr_offset; 176 unsigned long kaslr_offset_phys; 177 unsigned long identity_base; 178 unsigned long identity_size; 179 }; 180 181 extern struct vm_layout vm_layout; 182 183 #define __kaslr_offset vm_layout.kaslr_offset 184 #define __kaslr_offset_phys vm_layout.kaslr_offset_phys 185 #define __identity_base vm_layout.identity_base 186 #define ident_map_size vm_layout.identity_size 187 188 static inline unsigned long kaslr_offset(void) 189 { 190 return __kaslr_offset; 191 } 192 193 extern int __kaslr_enabled; 194 static inline int kaslr_enabled(void) 195 { 196 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) 197 return __kaslr_enabled; 198 return 0; 199 } 200 201 #define __PAGE_OFFSET __identity_base 202 #define PAGE_OFFSET __PAGE_OFFSET 203 204 #ifdef __DECOMPRESSOR 205 206 #define __pa_nodebug(x) ((unsigned long)(x)) 207 #define __pa(x) __pa_nodebug(x) 208 #define __pa32(x) __pa(x) 209 #define __va(x) ((void *)(unsigned long)(x)) 210 211 #else /* __DECOMPRESSOR */ 212 213 static inline unsigned long __pa_nodebug(unsigned long x) 214 { 215 if (x < __kaslr_offset) 216 return x - __identity_base; 217 return x - __kaslr_offset + __kaslr_offset_phys; 218 } 219 220 #ifdef CONFIG_DEBUG_VIRTUAL 221 222 unsigned long __phys_addr(unsigned long x, bool is_31bit); 223 224 #else /* CONFIG_DEBUG_VIRTUAL */ 225 226 static inline unsigned long __phys_addr(unsigned long x, bool is_31bit) 227 { 228 return __pa_nodebug(x); 229 } 230 231 #endif /* CONFIG_DEBUG_VIRTUAL */ 232 233 #define __pa(x) __phys_addr((unsigned long)(x), false) 234 #define __pa32(x) __phys_addr((unsigned long)(x), true) 235 #define __va(x) ((void *)((unsigned long)(x) + __identity_base)) 236 237 #endif /* __DECOMPRESSOR */ 238 239 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT) 240 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 241 242 #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys)) 243 #define phys_to_folio(phys) page_folio(phys_to_page(phys)) 244 #define page_to_phys(page) pfn_to_phys(page_to_pfn(page)) 245 #define folio_to_phys(page) pfn_to_phys(folio_pfn(folio)) 246 247 static inline void *pfn_to_virt(unsigned long pfn) 248 { 249 return __va(pfn_to_phys(pfn)); 250 } 251 252 static inline unsigned long virt_to_pfn(const void *kaddr) 253 { 254 return phys_to_pfn(__pa(kaddr)); 255 } 256 257 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn) 258 259 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 260 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 261 262 #define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr)))) 263 264 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 265 266 #endif /* !__ASSEMBLY__ */ 267 268 #include <asm-generic/memory_model.h> 269 #include <asm-generic/getorder.h> 270 271 #define AMODE31_SIZE (3 * PAGE_SIZE) 272 273 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) 274 #define __NO_KASLR_START_KERNEL CONFIG_KERNEL_IMAGE_BASE 275 #define __NO_KASLR_END_KERNEL (__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE) 276 277 #define TEXT_OFFSET 0x100000 278 279 #endif /* _S390_PAGE_H */ 280