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 clear_user_page(page, vaddr, pg) clear_page(page) 69 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 70 71 #define vma_alloc_zeroed_movable_folio(vma, vaddr) \ 72 vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr) 73 74 #ifdef CONFIG_STRICT_MM_TYPECHECKS 75 #define STRICT_MM_TYPECHECKS 76 #endif 77 78 #ifdef STRICT_MM_TYPECHECKS 79 80 typedef struct { unsigned long pgprot; } pgprot_t; 81 typedef struct { unsigned long pgste; } pgste_t; 82 typedef struct { unsigned long pte; } pte_t; 83 typedef struct { unsigned long pmd; } pmd_t; 84 typedef struct { unsigned long pud; } pud_t; 85 typedef struct { unsigned long p4d; } p4d_t; 86 typedef struct { unsigned long pgd; } pgd_t; 87 88 #define DEFINE_PGVAL_FUNC(name) \ 89 static __always_inline unsigned long name ## _val(name ## _t name) \ 90 { \ 91 return name.name; \ 92 } 93 94 #else /* STRICT_MM_TYPECHECKS */ 95 96 typedef unsigned long pgprot_t; 97 typedef unsigned long pgste_t; 98 typedef unsigned long pte_t; 99 typedef unsigned long pmd_t; 100 typedef unsigned long pud_t; 101 typedef unsigned long p4d_t; 102 typedef unsigned long pgd_t; 103 104 #define DEFINE_PGVAL_FUNC(name) \ 105 static __always_inline unsigned long name ## _val(name ## _t name) \ 106 { \ 107 return name; \ 108 } 109 110 #endif /* STRICT_MM_TYPECHECKS */ 111 112 DEFINE_PGVAL_FUNC(pgprot) 113 DEFINE_PGVAL_FUNC(pgste) 114 DEFINE_PGVAL_FUNC(pte) 115 DEFINE_PGVAL_FUNC(pmd) 116 DEFINE_PGVAL_FUNC(pud) 117 DEFINE_PGVAL_FUNC(p4d) 118 DEFINE_PGVAL_FUNC(pgd) 119 120 typedef pte_t *pgtable_t; 121 122 #define __pgprot(x) ((pgprot_t) { (x) } ) 123 #define __pgste(x) ((pgste_t) { (x) } ) 124 #define __pte(x) ((pte_t) { (x) } ) 125 #define __pmd(x) ((pmd_t) { (x) } ) 126 #define __pud(x) ((pud_t) { (x) } ) 127 #define __p4d(x) ((p4d_t) { (x) } ) 128 #define __pgd(x) ((pgd_t) { (x) } ) 129 130 static inline void page_set_storage_key(unsigned long addr, 131 unsigned char skey, int mapped) 132 { 133 if (!mapped) { 134 asm volatile( 135 " .insn rrf,0xb22b0000,%[skey],%[addr],8,0" 136 : 137 : [skey] "d" (skey), [addr] "a" (addr) 138 : "memory"); 139 } else { 140 asm volatile( 141 " sske %[skey],%[addr]" 142 : 143 : [skey] "d" (skey), [addr] "a" (addr) 144 : "memory"); 145 } 146 } 147 148 static inline unsigned char page_get_storage_key(unsigned long addr) 149 { 150 unsigned char skey; 151 152 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 153 return skey; 154 } 155 156 static inline int page_reset_referenced(unsigned long addr) 157 { 158 int cc; 159 160 asm volatile( 161 " rrbe 0,%[addr]\n" 162 CC_IPM(cc) 163 : CC_OUT(cc, cc) 164 : [addr] "a" (addr) 165 : CC_CLOBBER); 166 return CC_TRANSFORM(cc); 167 } 168 169 /* Bits int the storage key */ 170 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 171 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 172 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 173 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 174 175 struct page; 176 struct folio; 177 void arch_free_page(struct page *page, int order); 178 void arch_alloc_page(struct page *page, int order); 179 180 static inline int devmem_is_allowed(unsigned long pfn) 181 { 182 return 0; 183 } 184 185 #define HAVE_ARCH_FREE_PAGE 186 #define HAVE_ARCH_ALLOC_PAGE 187 188 int arch_make_folio_accessible(struct folio *folio); 189 #define HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE 190 191 struct vm_layout { 192 unsigned long kaslr_offset; 193 unsigned long kaslr_offset_phys; 194 unsigned long identity_base; 195 unsigned long identity_size; 196 }; 197 198 extern struct vm_layout vm_layout; 199 200 #define __kaslr_offset vm_layout.kaslr_offset 201 #define __kaslr_offset_phys vm_layout.kaslr_offset_phys 202 #ifdef CONFIG_RANDOMIZE_IDENTITY_BASE 203 #define __identity_base vm_layout.identity_base 204 #else 205 #define __identity_base 0UL 206 #endif 207 #define ident_map_size vm_layout.identity_size 208 209 static inline unsigned long kaslr_offset(void) 210 { 211 return __kaslr_offset; 212 } 213 214 extern int __kaslr_enabled; 215 static inline int kaslr_enabled(void) 216 { 217 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) 218 return __kaslr_enabled; 219 return 0; 220 } 221 222 #define __PAGE_OFFSET __identity_base 223 #define PAGE_OFFSET __PAGE_OFFSET 224 225 #ifdef __DECOMPRESSOR 226 227 #define __pa_nodebug(x) ((unsigned long)(x)) 228 #define __pa(x) __pa_nodebug(x) 229 #define __pa32(x) __pa(x) 230 #define __va(x) ((void *)(unsigned long)(x)) 231 232 #else /* __DECOMPRESSOR */ 233 234 static inline unsigned long __pa_nodebug(unsigned long x) 235 { 236 if (x < __kaslr_offset) 237 return x - __identity_base; 238 return x - __kaslr_offset + __kaslr_offset_phys; 239 } 240 241 #ifdef CONFIG_DEBUG_VIRTUAL 242 243 unsigned long __phys_addr(unsigned long x, bool is_31bit); 244 245 #else /* CONFIG_DEBUG_VIRTUAL */ 246 247 static inline unsigned long __phys_addr(unsigned long x, bool is_31bit) 248 { 249 return __pa_nodebug(x); 250 } 251 252 #endif /* CONFIG_DEBUG_VIRTUAL */ 253 254 #define __pa(x) __phys_addr((unsigned long)(x), false) 255 #define __pa32(x) __phys_addr((unsigned long)(x), true) 256 #define __va(x) ((void *)((unsigned long)(x) + __identity_base)) 257 258 #endif /* __DECOMPRESSOR */ 259 260 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT) 261 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 262 263 #define phys_to_folio(phys) page_folio(phys_to_page(phys)) 264 #define folio_to_phys(page) pfn_to_phys(folio_pfn(folio)) 265 266 static inline void *pfn_to_virt(unsigned long pfn) 267 { 268 return __va(pfn_to_phys(pfn)); 269 } 270 271 static inline unsigned long virt_to_pfn(const void *kaddr) 272 { 273 return phys_to_pfn(__pa(kaddr)); 274 } 275 276 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn) 277 278 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 279 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 280 281 #define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr)))) 282 283 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 284 285 #endif /* !__ASSEMBLER__ */ 286 287 #include <asm-generic/memory_model.h> 288 #include <asm-generic/getorder.h> 289 290 #define AMODE31_SIZE (3 * PAGE_SIZE) 291 292 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) 293 #define __NO_KASLR_START_KERNEL CONFIG_KERNEL_IMAGE_BASE 294 #define __NO_KASLR_END_KERNEL (__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE) 295 296 #define TEXT_OFFSET 0x100000 297 298 #endif /* _S390_PAGE_H */ 299