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