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 #include <asm/asm.h> 14 15 #include <vdso/page.h> 16 17 #define PAGE_DEFAULT_ACC _AC(0, UL) 18 /* storage-protection override */ 19 #define PAGE_SPO_ACC 9 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 #define HUGE_MAX_HSTATE 2 27 28 #define ARCH_HAS_SETCLEAR_HUGE_PTE 29 #define ARCH_HAS_HUGE_PTE_TYPE 30 #define ARCH_HAS_PREPARE_HUGEPAGE 31 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH 32 33 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 34 35 #include <asm/setup.h> 36 #ifndef __ASSEMBLER__ 37 38 void __storage_key_init_range(unsigned long start, unsigned long end); 39 40 static inline void storage_key_init_range(unsigned long start, unsigned long end) 41 { 42 if (PAGE_DEFAULT_KEY != 0) 43 __storage_key_init_range(start, end); 44 } 45 46 #define clear_page(page) memset((page), 0, PAGE_SIZE) 47 48 /* 49 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to 50 * bypass caches when copying a page. Especially when copying huge pages 51 * this keeps L1 and L2 data caches alive. 52 */ 53 static inline void copy_page(void *to, void *from) 54 { 55 union register_pair dst, src; 56 57 dst.even = (unsigned long) to; 58 dst.odd = 0x1000; 59 src.even = (unsigned long) from; 60 src.odd = 0xb0001000; 61 62 asm volatile( 63 " mvcl %[dst],%[src]" 64 : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair) 65 : : "memory", "cc"); 66 } 67 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) 72 73 #ifdef CONFIG_STRICT_MM_TYPECHECKS 74 #define STRICT_MM_TYPECHECKS 75 #endif 76 77 #ifdef STRICT_MM_TYPECHECKS 78 79 typedef struct { unsigned long pgprot; } pgprot_t; 80 typedef struct { unsigned long pgste; } pgste_t; 81 typedef struct { unsigned long pte; } pte_t; 82 typedef struct { unsigned long pmd; } pmd_t; 83 typedef struct { unsigned long pud; } pud_t; 84 typedef struct { unsigned long p4d; } p4d_t; 85 typedef struct { unsigned long pgd; } pgd_t; 86 87 #define DEFINE_PGVAL_FUNC(name) \ 88 static __always_inline unsigned long name ## _val(name ## _t name) \ 89 { \ 90 return name.name; \ 91 } 92 93 #else /* STRICT_MM_TYPECHECKS */ 94 95 typedef unsigned long pgprot_t; 96 typedef unsigned long pgste_t; 97 typedef unsigned long pte_t; 98 typedef unsigned long pmd_t; 99 typedef unsigned long pud_t; 100 typedef unsigned long p4d_t; 101 typedef unsigned long pgd_t; 102 103 #define DEFINE_PGVAL_FUNC(name) \ 104 static __always_inline unsigned long name ## _val(name ## _t name) \ 105 { \ 106 return name; \ 107 } 108 109 #endif /* STRICT_MM_TYPECHECKS */ 110 111 DEFINE_PGVAL_FUNC(pgprot) 112 DEFINE_PGVAL_FUNC(pgste) 113 DEFINE_PGVAL_FUNC(pte) 114 DEFINE_PGVAL_FUNC(pmd) 115 DEFINE_PGVAL_FUNC(pud) 116 DEFINE_PGVAL_FUNC(p4d) 117 DEFINE_PGVAL_FUNC(pgd) 118 119 typedef pte_t *pgtable_t; 120 121 #define __pgprot(x) ((pgprot_t) { (x) } ) 122 #define __pgste(x) ((pgste_t) { (x) } ) 123 #define __pte(x) ((pte_t) { (x) } ) 124 #define __pmd(x) ((pmd_t) { (x) } ) 125 #define __pud(x) ((pud_t) { (x) } ) 126 #define __p4d(x) ((p4d_t) { (x) } ) 127 #define __pgd(x) ((pgd_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( 134 " .insn rrf,0xb22b0000,%[skey],%[addr],8,0" 135 : 136 : [skey] "d" (skey), [addr] "a" (addr) 137 : "memory"); 138 } else { 139 asm volatile( 140 " sske %[skey],%[addr]" 141 : 142 : [skey] "d" (skey), [addr] "a" (addr) 143 : "memory"); 144 } 145 } 146 147 static inline unsigned char page_get_storage_key(unsigned long addr) 148 { 149 unsigned char skey; 150 151 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 152 return skey; 153 } 154 155 static inline int page_reset_referenced(unsigned long addr) 156 { 157 int cc; 158 159 asm volatile( 160 " rrbe 0,%[addr]\n" 161 CC_IPM(cc) 162 : CC_OUT(cc, cc) 163 : [addr] "a" (addr) 164 : CC_CLOBBER); 165 return CC_TRANSFORM(cc); 166 } 167 168 int split_pud_page(pud_t *pudp, unsigned long addr); 169 170 /* Bits int the storage key */ 171 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 172 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 173 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 174 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 175 176 struct page; 177 struct folio; 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 int arch_make_folio_accessible(struct folio *folio); 190 #define HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE 191 192 struct vm_layout { 193 unsigned long kaslr_offset; 194 unsigned long kaslr_offset_phys; 195 unsigned long identity_base; 196 unsigned long identity_size; 197 }; 198 199 extern struct vm_layout vm_layout; 200 201 #define __kaslr_offset vm_layout.kaslr_offset 202 #define __kaslr_offset_phys vm_layout.kaslr_offset_phys 203 #ifdef CONFIG_RANDOMIZE_IDENTITY_BASE 204 #define __identity_base vm_layout.identity_base 205 #else 206 #define __identity_base 0UL 207 #endif 208 #define ident_map_size vm_layout.identity_size 209 210 static inline unsigned long kaslr_offset(void) 211 { 212 return __kaslr_offset; 213 } 214 215 extern int __kaslr_enabled; 216 static inline int kaslr_enabled(void) 217 { 218 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) 219 return __kaslr_enabled; 220 return 0; 221 } 222 223 #define __PAGE_OFFSET __identity_base 224 #define PAGE_OFFSET __PAGE_OFFSET 225 226 #ifdef __DECOMPRESSOR 227 228 #define __pa_nodebug(x) ((unsigned long)(x)) 229 #define __pa(x) __pa_nodebug(x) 230 #define __pa32(x) __pa(x) 231 #define __va(x) ((void *)(unsigned long)(x)) 232 233 #else /* __DECOMPRESSOR */ 234 235 static inline unsigned long __pa_nodebug(unsigned long x) 236 { 237 if (x < __kaslr_offset) 238 return x - __identity_base; 239 return x - __kaslr_offset + __kaslr_offset_phys; 240 } 241 242 #ifdef CONFIG_DEBUG_VIRTUAL 243 244 unsigned long __phys_addr(unsigned long x, bool is_31bit); 245 246 #else /* CONFIG_DEBUG_VIRTUAL */ 247 248 static inline unsigned long __phys_addr(unsigned long x, bool is_31bit) 249 { 250 return __pa_nodebug(x); 251 } 252 253 #endif /* CONFIG_DEBUG_VIRTUAL */ 254 255 #define __pa(x) __phys_addr((unsigned long)(x), false) 256 #define __pa32(x) __phys_addr((unsigned long)(x), true) 257 #define __va(x) ((void *)((unsigned long)(x) + __identity_base)) 258 259 #endif /* __DECOMPRESSOR */ 260 261 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT) 262 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 263 264 #define phys_to_folio(phys) page_folio(phys_to_page(phys)) 265 #define folio_to_phys(page) pfn_to_phys(folio_pfn(folio)) 266 267 static inline void *pfn_to_virt(unsigned long pfn) 268 { 269 return __va(pfn_to_phys(pfn)); 270 } 271 272 static inline unsigned long virt_to_pfn(const void *kaddr) 273 { 274 return phys_to_pfn(__pa(kaddr)); 275 } 276 277 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn) 278 279 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 280 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 281 282 #define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr)))) 283 284 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 285 286 #endif /* !__ASSEMBLER__ */ 287 288 #include <asm-generic/memory_model.h> 289 #include <asm-generic/getorder.h> 290 291 #define AMODE31_SIZE (3 * PAGE_SIZE) 292 293 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) 294 #define __NO_KASLR_START_KERNEL CONFIG_KERNEL_IMAGE_BASE 295 #define __NO_KASLR_END_KERNEL (__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE) 296 297 #define TEXT_OFFSET 0x100000 298 299 #endif /* _S390_PAGE_H */ 300