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 * Ulrich Weigand (weigand@de.ibm.com) 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 * 9 * Derived from "include/asm-i386/pgtable.h" 10 */ 11 12 #ifndef _ASM_S390_PGTABLE_H 13 #define _ASM_S390_PGTABLE_H 14 15 #include <linux/sched.h> 16 #include <linux/mm_types.h> 17 #include <linux/page-flags.h> 18 #include <linux/radix-tree.h> 19 #include <linux/atomic.h> 20 #include <asm/bug.h> 21 #include <asm/page.h> 22 #include <asm/uv.h> 23 24 extern pgd_t swapper_pg_dir[]; 25 extern void paging_init(void); 26 extern unsigned long s390_invalid_asce; 27 28 enum { 29 PG_DIRECT_MAP_4K = 0, 30 PG_DIRECT_MAP_1M, 31 PG_DIRECT_MAP_2G, 32 PG_DIRECT_MAP_MAX 33 }; 34 35 extern atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX]; 36 37 static inline void update_page_count(int level, long count) 38 { 39 if (IS_ENABLED(CONFIG_PROC_FS)) 40 atomic_long_add(count, &direct_pages_count[level]); 41 } 42 43 struct seq_file; 44 void arch_report_meminfo(struct seq_file *m); 45 46 /* 47 * The S390 doesn't have any external MMU info: the kernel page 48 * tables contain all the necessary information. 49 */ 50 #define update_mmu_cache(vma, address, ptep) do { } while (0) 51 #define update_mmu_cache_pmd(vma, address, ptep) do { } while (0) 52 53 /* 54 * ZERO_PAGE is a global shared page that is always zero; used 55 * for zero-mapped memory areas etc.. 56 */ 57 58 extern unsigned long empty_zero_page; 59 extern unsigned long zero_page_mask; 60 61 #define ZERO_PAGE(vaddr) \ 62 (virt_to_page((void *)(empty_zero_page + \ 63 (((unsigned long)(vaddr)) &zero_page_mask)))) 64 #define __HAVE_COLOR_ZERO_PAGE 65 66 /* TODO: s390 cannot support io_remap_pfn_range... */ 67 68 #define FIRST_USER_ADDRESS 0UL 69 70 #define pte_ERROR(e) \ 71 printk("%s:%d: bad pte %p.\n", __FILE__, __LINE__, (void *) pte_val(e)) 72 #define pmd_ERROR(e) \ 73 printk("%s:%d: bad pmd %p.\n", __FILE__, __LINE__, (void *) pmd_val(e)) 74 #define pud_ERROR(e) \ 75 printk("%s:%d: bad pud %p.\n", __FILE__, __LINE__, (void *) pud_val(e)) 76 #define p4d_ERROR(e) \ 77 printk("%s:%d: bad p4d %p.\n", __FILE__, __LINE__, (void *) p4d_val(e)) 78 #define pgd_ERROR(e) \ 79 printk("%s:%d: bad pgd %p.\n", __FILE__, __LINE__, (void *) pgd_val(e)) 80 81 /* 82 * The vmalloc and module area will always be on the topmost area of the 83 * kernel mapping. 512GB are reserved for vmalloc by default. 84 * At the top of the vmalloc area a 2GB area is reserved where modules 85 * will reside. That makes sure that inter module branches always 86 * happen without trampolines and in addition the placement within a 87 * 2GB frame is branch prediction unit friendly. 88 */ 89 extern unsigned long VMALLOC_START; 90 extern unsigned long VMALLOC_END; 91 #define VMALLOC_DEFAULT_SIZE ((512UL << 30) - MODULES_LEN) 92 extern struct page *vmemmap; 93 extern unsigned long vmemmap_size; 94 95 #define VMEM_MAX_PHYS ((unsigned long) vmemmap) 96 97 extern unsigned long MODULES_VADDR; 98 extern unsigned long MODULES_END; 99 #define MODULES_VADDR MODULES_VADDR 100 #define MODULES_END MODULES_END 101 #define MODULES_LEN (1UL << 31) 102 103 static inline int is_module_addr(void *addr) 104 { 105 BUILD_BUG_ON(MODULES_LEN > (1UL << 31)); 106 if (addr < (void *)MODULES_VADDR) 107 return 0; 108 if (addr > (void *)MODULES_END) 109 return 0; 110 return 1; 111 } 112 113 /* 114 * A 64 bit pagetable entry of S390 has following format: 115 * | PFRA |0IPC| OS | 116 * 0000000000111111111122222222223333333333444444444455555555556666 117 * 0123456789012345678901234567890123456789012345678901234567890123 118 * 119 * I Page-Invalid Bit: Page is not available for address-translation 120 * P Page-Protection Bit: Store access not possible for page 121 * C Change-bit override: HW is not required to set change bit 122 * 123 * A 64 bit segmenttable entry of S390 has following format: 124 * | P-table origin | TT 125 * 0000000000111111111122222222223333333333444444444455555555556666 126 * 0123456789012345678901234567890123456789012345678901234567890123 127 * 128 * I Segment-Invalid Bit: Segment is not available for address-translation 129 * C Common-Segment Bit: Segment is not private (PoP 3-30) 130 * P Page-Protection Bit: Store access not possible for page 131 * TT Type 00 132 * 133 * A 64 bit region table entry of S390 has following format: 134 * | S-table origin | TF TTTL 135 * 0000000000111111111122222222223333333333444444444455555555556666 136 * 0123456789012345678901234567890123456789012345678901234567890123 137 * 138 * I Segment-Invalid Bit: Segment is not available for address-translation 139 * TT Type 01 140 * TF 141 * TL Table length 142 * 143 * The 64 bit regiontable origin of S390 has following format: 144 * | region table origon | DTTL 145 * 0000000000111111111122222222223333333333444444444455555555556666 146 * 0123456789012345678901234567890123456789012345678901234567890123 147 * 148 * X Space-Switch event: 149 * G Segment-Invalid Bit: 150 * P Private-Space Bit: 151 * S Storage-Alteration: 152 * R Real space 153 * TL Table-Length: 154 * 155 * A storage key has the following format: 156 * | ACC |F|R|C|0| 157 * 0 3 4 5 6 7 158 * ACC: access key 159 * F : fetch protection bit 160 * R : referenced bit 161 * C : changed bit 162 */ 163 164 /* Hardware bits in the page table entry */ 165 #define _PAGE_NOEXEC 0x100 /* HW no-execute bit */ 166 #define _PAGE_PROTECT 0x200 /* HW read-only bit */ 167 #define _PAGE_INVALID 0x400 /* HW invalid bit */ 168 #define _PAGE_LARGE 0x800 /* Bit to mark a large pte */ 169 170 /* Software bits in the page table entry */ 171 #define _PAGE_PRESENT 0x001 /* SW pte present bit */ 172 #define _PAGE_YOUNG 0x004 /* SW pte young bit */ 173 #define _PAGE_DIRTY 0x008 /* SW pte dirty bit */ 174 #define _PAGE_READ 0x010 /* SW pte read bit */ 175 #define _PAGE_WRITE 0x020 /* SW pte write bit */ 176 #define _PAGE_SPECIAL 0x040 /* SW associated with special page */ 177 #define _PAGE_UNUSED 0x080 /* SW bit for pgste usage state */ 178 179 #ifdef CONFIG_MEM_SOFT_DIRTY 180 #define _PAGE_SOFT_DIRTY 0x002 /* SW pte soft dirty bit */ 181 #else 182 #define _PAGE_SOFT_DIRTY 0x000 183 #endif 184 185 /* Set of bits not changed in pte_modify */ 186 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_SPECIAL | _PAGE_DIRTY | \ 187 _PAGE_YOUNG | _PAGE_SOFT_DIRTY) 188 189 /* 190 * handle_pte_fault uses pte_present and pte_none to find out the pte type 191 * WITHOUT holding the page table lock. The _PAGE_PRESENT bit is used to 192 * distinguish present from not-present ptes. It is changed only with the page 193 * table lock held. 194 * 195 * The following table gives the different possible bit combinations for 196 * the pte hardware and software bits in the last 12 bits of a pte 197 * (. unassigned bit, x don't care, t swap type): 198 * 199 * 842100000000 200 * 000084210000 201 * 000000008421 202 * .IR.uswrdy.p 203 * empty .10.00000000 204 * swap .11..ttttt.0 205 * prot-none, clean, old .11.xx0000.1 206 * prot-none, clean, young .11.xx0001.1 207 * prot-none, dirty, old .11.xx0010.1 208 * prot-none, dirty, young .11.xx0011.1 209 * read-only, clean, old .11.xx0100.1 210 * read-only, clean, young .01.xx0101.1 211 * read-only, dirty, old .11.xx0110.1 212 * read-only, dirty, young .01.xx0111.1 213 * read-write, clean, old .11.xx1100.1 214 * read-write, clean, young .01.xx1101.1 215 * read-write, dirty, old .10.xx1110.1 216 * read-write, dirty, young .00.xx1111.1 217 * HW-bits: R read-only, I invalid 218 * SW-bits: p present, y young, d dirty, r read, w write, s special, 219 * u unused, l large 220 * 221 * pte_none is true for the bit pattern .10.00000000, pte == 0x400 222 * pte_swap is true for the bit pattern .11..ooooo.0, (pte & 0x201) == 0x200 223 * pte_present is true for the bit pattern .xx.xxxxxx.1, (pte & 0x001) == 0x001 224 */ 225 226 /* Bits in the segment/region table address-space-control-element */ 227 #define _ASCE_ORIGIN ~0xfffUL/* region/segment table origin */ 228 #define _ASCE_PRIVATE_SPACE 0x100 /* private space control */ 229 #define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */ 230 #define _ASCE_SPACE_SWITCH 0x40 /* space switch event */ 231 #define _ASCE_REAL_SPACE 0x20 /* real space control */ 232 #define _ASCE_TYPE_MASK 0x0c /* asce table type mask */ 233 #define _ASCE_TYPE_REGION1 0x0c /* region first table type */ 234 #define _ASCE_TYPE_REGION2 0x08 /* region second table type */ 235 #define _ASCE_TYPE_REGION3 0x04 /* region third table type */ 236 #define _ASCE_TYPE_SEGMENT 0x00 /* segment table type */ 237 #define _ASCE_TABLE_LENGTH 0x03 /* region table length */ 238 239 /* Bits in the region table entry */ 240 #define _REGION_ENTRY_ORIGIN ~0xfffUL/* region/segment table origin */ 241 #define _REGION_ENTRY_PROTECT 0x200 /* region protection bit */ 242 #define _REGION_ENTRY_NOEXEC 0x100 /* region no-execute bit */ 243 #define _REGION_ENTRY_OFFSET 0xc0 /* region table offset */ 244 #define _REGION_ENTRY_INVALID 0x20 /* invalid region table entry */ 245 #define _REGION_ENTRY_TYPE_MASK 0x0c /* region table type mask */ 246 #define _REGION_ENTRY_TYPE_R1 0x0c /* region first table type */ 247 #define _REGION_ENTRY_TYPE_R2 0x08 /* region second table type */ 248 #define _REGION_ENTRY_TYPE_R3 0x04 /* region third table type */ 249 #define _REGION_ENTRY_LENGTH 0x03 /* region third length */ 250 251 #define _REGION1_ENTRY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_LENGTH) 252 #define _REGION1_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INVALID) 253 #define _REGION2_ENTRY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_LENGTH) 254 #define _REGION2_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INVALID) 255 #define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH) 256 #define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID) 257 258 #define _REGION3_ENTRY_ORIGIN_LARGE ~0x7fffffffUL /* large page address */ 259 #define _REGION3_ENTRY_DIRTY 0x2000 /* SW region dirty bit */ 260 #define _REGION3_ENTRY_YOUNG 0x1000 /* SW region young bit */ 261 #define _REGION3_ENTRY_LARGE 0x0400 /* RTTE-format control, large page */ 262 #define _REGION3_ENTRY_READ 0x0002 /* SW region read bit */ 263 #define _REGION3_ENTRY_WRITE 0x0001 /* SW region write bit */ 264 265 #ifdef CONFIG_MEM_SOFT_DIRTY 266 #define _REGION3_ENTRY_SOFT_DIRTY 0x4000 /* SW region soft dirty bit */ 267 #else 268 #define _REGION3_ENTRY_SOFT_DIRTY 0x0000 /* SW region soft dirty bit */ 269 #endif 270 271 #define _REGION_ENTRY_BITS 0xfffffffffffff22fUL 272 273 /* Bits in the segment table entry */ 274 #define _SEGMENT_ENTRY_BITS 0xfffffffffffffe33UL 275 #define _SEGMENT_ENTRY_HARDWARE_BITS 0xfffffffffffffe30UL 276 #define _SEGMENT_ENTRY_HARDWARE_BITS_LARGE 0xfffffffffff00730UL 277 #define _SEGMENT_ENTRY_ORIGIN_LARGE ~0xfffffUL /* large page address */ 278 #define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* page table origin */ 279 #define _SEGMENT_ENTRY_PROTECT 0x200 /* segment protection bit */ 280 #define _SEGMENT_ENTRY_NOEXEC 0x100 /* segment no-execute bit */ 281 #define _SEGMENT_ENTRY_INVALID 0x20 /* invalid segment table entry */ 282 #define _SEGMENT_ENTRY_TYPE_MASK 0x0c /* segment table type mask */ 283 284 #define _SEGMENT_ENTRY (0) 285 #define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INVALID) 286 287 #define _SEGMENT_ENTRY_DIRTY 0x2000 /* SW segment dirty bit */ 288 #define _SEGMENT_ENTRY_YOUNG 0x1000 /* SW segment young bit */ 289 #define _SEGMENT_ENTRY_LARGE 0x0400 /* STE-format control, large page */ 290 #define _SEGMENT_ENTRY_WRITE 0x0002 /* SW segment write bit */ 291 #define _SEGMENT_ENTRY_READ 0x0001 /* SW segment read bit */ 292 293 #ifdef CONFIG_MEM_SOFT_DIRTY 294 #define _SEGMENT_ENTRY_SOFT_DIRTY 0x4000 /* SW segment soft dirty bit */ 295 #else 296 #define _SEGMENT_ENTRY_SOFT_DIRTY 0x0000 /* SW segment soft dirty bit */ 297 #endif 298 299 #define _CRST_ENTRIES 2048 /* number of region/segment table entries */ 300 #define _PAGE_ENTRIES 256 /* number of page table entries */ 301 302 #define _CRST_TABLE_SIZE (_CRST_ENTRIES * 8) 303 #define _PAGE_TABLE_SIZE (_PAGE_ENTRIES * 8) 304 305 #define _REGION1_SHIFT 53 306 #define _REGION2_SHIFT 42 307 #define _REGION3_SHIFT 31 308 #define _SEGMENT_SHIFT 20 309 310 #define _REGION1_INDEX (0x7ffUL << _REGION1_SHIFT) 311 #define _REGION2_INDEX (0x7ffUL << _REGION2_SHIFT) 312 #define _REGION3_INDEX (0x7ffUL << _REGION3_SHIFT) 313 #define _SEGMENT_INDEX (0x7ffUL << _SEGMENT_SHIFT) 314 #define _PAGE_INDEX (0xffUL << _PAGE_SHIFT) 315 316 #define _REGION1_SIZE (1UL << _REGION1_SHIFT) 317 #define _REGION2_SIZE (1UL << _REGION2_SHIFT) 318 #define _REGION3_SIZE (1UL << _REGION3_SHIFT) 319 #define _SEGMENT_SIZE (1UL << _SEGMENT_SHIFT) 320 321 #define _REGION1_MASK (~(_REGION1_SIZE - 1)) 322 #define _REGION2_MASK (~(_REGION2_SIZE - 1)) 323 #define _REGION3_MASK (~(_REGION3_SIZE - 1)) 324 #define _SEGMENT_MASK (~(_SEGMENT_SIZE - 1)) 325 326 #define PMD_SHIFT _SEGMENT_SHIFT 327 #define PUD_SHIFT _REGION3_SHIFT 328 #define P4D_SHIFT _REGION2_SHIFT 329 #define PGDIR_SHIFT _REGION1_SHIFT 330 331 #define PMD_SIZE _SEGMENT_SIZE 332 #define PUD_SIZE _REGION3_SIZE 333 #define P4D_SIZE _REGION2_SIZE 334 #define PGDIR_SIZE _REGION1_SIZE 335 336 #define PMD_MASK _SEGMENT_MASK 337 #define PUD_MASK _REGION3_MASK 338 #define P4D_MASK _REGION2_MASK 339 #define PGDIR_MASK _REGION1_MASK 340 341 #define PTRS_PER_PTE _PAGE_ENTRIES 342 #define PTRS_PER_PMD _CRST_ENTRIES 343 #define PTRS_PER_PUD _CRST_ENTRIES 344 #define PTRS_PER_P4D _CRST_ENTRIES 345 #define PTRS_PER_PGD _CRST_ENTRIES 346 347 #define MAX_PTRS_PER_P4D PTRS_PER_P4D 348 349 /* 350 * Segment table and region3 table entry encoding 351 * (R = read-only, I = invalid, y = young bit): 352 * dy..R...I...wr 353 * prot-none, clean, old 00..1...1...00 354 * prot-none, clean, young 01..1...1...00 355 * prot-none, dirty, old 10..1...1...00 356 * prot-none, dirty, young 11..1...1...00 357 * read-only, clean, old 00..1...1...01 358 * read-only, clean, young 01..1...0...01 359 * read-only, dirty, old 10..1...1...01 360 * read-only, dirty, young 11..1...0...01 361 * read-write, clean, old 00..1...1...11 362 * read-write, clean, young 01..1...0...11 363 * read-write, dirty, old 10..0...1...11 364 * read-write, dirty, young 11..0...0...11 365 * The segment table origin is used to distinguish empty (origin==0) from 366 * read-write, old segment table entries (origin!=0) 367 * HW-bits: R read-only, I invalid 368 * SW-bits: y young, d dirty, r read, w write 369 */ 370 371 /* Page status table bits for virtualization */ 372 #define PGSTE_ACC_BITS 0xf000000000000000UL 373 #define PGSTE_FP_BIT 0x0800000000000000UL 374 #define PGSTE_PCL_BIT 0x0080000000000000UL 375 #define PGSTE_HR_BIT 0x0040000000000000UL 376 #define PGSTE_HC_BIT 0x0020000000000000UL 377 #define PGSTE_GR_BIT 0x0004000000000000UL 378 #define PGSTE_GC_BIT 0x0002000000000000UL 379 #define PGSTE_UC_BIT 0x0000800000000000UL /* user dirty (migration) */ 380 #define PGSTE_IN_BIT 0x0000400000000000UL /* IPTE notify bit */ 381 #define PGSTE_VSIE_BIT 0x0000200000000000UL /* ref'd in a shadow table */ 382 383 /* Guest Page State used for virtualization */ 384 #define _PGSTE_GPS_ZERO 0x0000000080000000UL 385 #define _PGSTE_GPS_NODAT 0x0000000040000000UL 386 #define _PGSTE_GPS_USAGE_MASK 0x0000000003000000UL 387 #define _PGSTE_GPS_USAGE_STABLE 0x0000000000000000UL 388 #define _PGSTE_GPS_USAGE_UNUSED 0x0000000001000000UL 389 #define _PGSTE_GPS_USAGE_POT_VOLATILE 0x0000000002000000UL 390 #define _PGSTE_GPS_USAGE_VOLATILE _PGSTE_GPS_USAGE_MASK 391 392 /* 393 * A user page table pointer has the space-switch-event bit, the 394 * private-space-control bit and the storage-alteration-event-control 395 * bit set. A kernel page table pointer doesn't need them. 396 */ 397 #define _ASCE_USER_BITS (_ASCE_SPACE_SWITCH | _ASCE_PRIVATE_SPACE | \ 398 _ASCE_ALT_EVENT) 399 400 /* 401 * Page protection definitions. 402 */ 403 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_INVALID | _PAGE_PROTECT) 404 #define PAGE_RO __pgprot(_PAGE_PRESENT | _PAGE_READ | \ 405 _PAGE_NOEXEC | _PAGE_INVALID | _PAGE_PROTECT) 406 #define PAGE_RX __pgprot(_PAGE_PRESENT | _PAGE_READ | \ 407 _PAGE_INVALID | _PAGE_PROTECT) 408 #define PAGE_RW __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 409 _PAGE_NOEXEC | _PAGE_INVALID | _PAGE_PROTECT) 410 #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 411 _PAGE_INVALID | _PAGE_PROTECT) 412 413 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 414 _PAGE_YOUNG | _PAGE_DIRTY | _PAGE_NOEXEC) 415 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 416 _PAGE_YOUNG | _PAGE_DIRTY | _PAGE_NOEXEC) 417 #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_YOUNG | \ 418 _PAGE_PROTECT | _PAGE_NOEXEC) 419 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ 420 _PAGE_YOUNG | _PAGE_DIRTY) 421 422 /* 423 * On s390 the page table entry has an invalid bit and a read-only bit. 424 * Read permission implies execute permission and write permission 425 * implies read permission. 426 */ 427 /*xwr*/ 428 #define __P000 PAGE_NONE 429 #define __P001 PAGE_RO 430 #define __P010 PAGE_RO 431 #define __P011 PAGE_RO 432 #define __P100 PAGE_RX 433 #define __P101 PAGE_RX 434 #define __P110 PAGE_RX 435 #define __P111 PAGE_RX 436 437 #define __S000 PAGE_NONE 438 #define __S001 PAGE_RO 439 #define __S010 PAGE_RW 440 #define __S011 PAGE_RW 441 #define __S100 PAGE_RX 442 #define __S101 PAGE_RX 443 #define __S110 PAGE_RWX 444 #define __S111 PAGE_RWX 445 446 /* 447 * Segment entry (large page) protection definitions. 448 */ 449 #define SEGMENT_NONE __pgprot(_SEGMENT_ENTRY_INVALID | \ 450 _SEGMENT_ENTRY_PROTECT) 451 #define SEGMENT_RO __pgprot(_SEGMENT_ENTRY_PROTECT | \ 452 _SEGMENT_ENTRY_READ | \ 453 _SEGMENT_ENTRY_NOEXEC) 454 #define SEGMENT_RX __pgprot(_SEGMENT_ENTRY_PROTECT | \ 455 _SEGMENT_ENTRY_READ) 456 #define SEGMENT_RW __pgprot(_SEGMENT_ENTRY_READ | \ 457 _SEGMENT_ENTRY_WRITE | \ 458 _SEGMENT_ENTRY_NOEXEC) 459 #define SEGMENT_RWX __pgprot(_SEGMENT_ENTRY_READ | \ 460 _SEGMENT_ENTRY_WRITE) 461 #define SEGMENT_KERNEL __pgprot(_SEGMENT_ENTRY | \ 462 _SEGMENT_ENTRY_LARGE | \ 463 _SEGMENT_ENTRY_READ | \ 464 _SEGMENT_ENTRY_WRITE | \ 465 _SEGMENT_ENTRY_YOUNG | \ 466 _SEGMENT_ENTRY_DIRTY | \ 467 _SEGMENT_ENTRY_NOEXEC) 468 #define SEGMENT_KERNEL_RO __pgprot(_SEGMENT_ENTRY | \ 469 _SEGMENT_ENTRY_LARGE | \ 470 _SEGMENT_ENTRY_READ | \ 471 _SEGMENT_ENTRY_YOUNG | \ 472 _SEGMENT_ENTRY_PROTECT | \ 473 _SEGMENT_ENTRY_NOEXEC) 474 #define SEGMENT_KERNEL_EXEC __pgprot(_SEGMENT_ENTRY | \ 475 _SEGMENT_ENTRY_LARGE | \ 476 _SEGMENT_ENTRY_READ | \ 477 _SEGMENT_ENTRY_WRITE | \ 478 _SEGMENT_ENTRY_YOUNG | \ 479 _SEGMENT_ENTRY_DIRTY) 480 481 /* 482 * Region3 entry (large page) protection definitions. 483 */ 484 485 #define REGION3_KERNEL __pgprot(_REGION_ENTRY_TYPE_R3 | \ 486 _REGION3_ENTRY_LARGE | \ 487 _REGION3_ENTRY_READ | \ 488 _REGION3_ENTRY_WRITE | \ 489 _REGION3_ENTRY_YOUNG | \ 490 _REGION3_ENTRY_DIRTY | \ 491 _REGION_ENTRY_NOEXEC) 492 #define REGION3_KERNEL_RO __pgprot(_REGION_ENTRY_TYPE_R3 | \ 493 _REGION3_ENTRY_LARGE | \ 494 _REGION3_ENTRY_READ | \ 495 _REGION3_ENTRY_YOUNG | \ 496 _REGION_ENTRY_PROTECT | \ 497 _REGION_ENTRY_NOEXEC) 498 499 static inline bool mm_p4d_folded(struct mm_struct *mm) 500 { 501 return mm->context.asce_limit <= _REGION1_SIZE; 502 } 503 #define mm_p4d_folded(mm) mm_p4d_folded(mm) 504 505 static inline bool mm_pud_folded(struct mm_struct *mm) 506 { 507 return mm->context.asce_limit <= _REGION2_SIZE; 508 } 509 #define mm_pud_folded(mm) mm_pud_folded(mm) 510 511 static inline bool mm_pmd_folded(struct mm_struct *mm) 512 { 513 return mm->context.asce_limit <= _REGION3_SIZE; 514 } 515 #define mm_pmd_folded(mm) mm_pmd_folded(mm) 516 517 static inline int mm_has_pgste(struct mm_struct *mm) 518 { 519 #ifdef CONFIG_PGSTE 520 if (unlikely(mm->context.has_pgste)) 521 return 1; 522 #endif 523 return 0; 524 } 525 526 static inline int mm_is_protected(struct mm_struct *mm) 527 { 528 #ifdef CONFIG_PGSTE 529 if (unlikely(atomic_read(&mm->context.is_protected))) 530 return 1; 531 #endif 532 return 0; 533 } 534 535 static inline int mm_alloc_pgste(struct mm_struct *mm) 536 { 537 #ifdef CONFIG_PGSTE 538 if (unlikely(mm->context.alloc_pgste)) 539 return 1; 540 #endif 541 return 0; 542 } 543 544 /* 545 * In the case that a guest uses storage keys 546 * faults should no longer be backed by zero pages 547 */ 548 #define mm_forbids_zeropage mm_has_pgste 549 static inline int mm_uses_skeys(struct mm_struct *mm) 550 { 551 #ifdef CONFIG_PGSTE 552 if (mm->context.uses_skeys) 553 return 1; 554 #endif 555 return 0; 556 } 557 558 static inline void csp(unsigned int *ptr, unsigned int old, unsigned int new) 559 { 560 register unsigned long reg2 asm("2") = old; 561 register unsigned long reg3 asm("3") = new; 562 unsigned long address = (unsigned long)ptr | 1; 563 564 asm volatile( 565 " csp %0,%3" 566 : "+d" (reg2), "+m" (*ptr) 567 : "d" (reg3), "d" (address) 568 : "cc"); 569 } 570 571 static inline void cspg(unsigned long *ptr, unsigned long old, unsigned long new) 572 { 573 register unsigned long reg2 asm("2") = old; 574 register unsigned long reg3 asm("3") = new; 575 unsigned long address = (unsigned long)ptr | 1; 576 577 asm volatile( 578 " .insn rre,0xb98a0000,%0,%3" 579 : "+d" (reg2), "+m" (*ptr) 580 : "d" (reg3), "d" (address) 581 : "cc"); 582 } 583 584 #define CRDTE_DTT_PAGE 0x00UL 585 #define CRDTE_DTT_SEGMENT 0x10UL 586 #define CRDTE_DTT_REGION3 0x14UL 587 #define CRDTE_DTT_REGION2 0x18UL 588 #define CRDTE_DTT_REGION1 0x1cUL 589 590 static inline void crdte(unsigned long old, unsigned long new, 591 unsigned long table, unsigned long dtt, 592 unsigned long address, unsigned long asce) 593 { 594 register unsigned long reg2 asm("2") = old; 595 register unsigned long reg3 asm("3") = new; 596 register unsigned long reg4 asm("4") = table | dtt; 597 register unsigned long reg5 asm("5") = address; 598 599 asm volatile(".insn rrf,0xb98f0000,%0,%2,%4,0" 600 : "+d" (reg2) 601 : "d" (reg3), "d" (reg4), "d" (reg5), "a" (asce) 602 : "memory", "cc"); 603 } 604 605 /* 606 * pgd/p4d/pud/pmd/pte query functions 607 */ 608 static inline int pgd_folded(pgd_t pgd) 609 { 610 return (pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R1; 611 } 612 613 static inline int pgd_present(pgd_t pgd) 614 { 615 if (pgd_folded(pgd)) 616 return 1; 617 return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL; 618 } 619 620 static inline int pgd_none(pgd_t pgd) 621 { 622 if (pgd_folded(pgd)) 623 return 0; 624 return (pgd_val(pgd) & _REGION_ENTRY_INVALID) != 0UL; 625 } 626 627 static inline int pgd_bad(pgd_t pgd) 628 { 629 if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R1) 630 return 0; 631 return (pgd_val(pgd) & ~_REGION_ENTRY_BITS) != 0; 632 } 633 634 static inline unsigned long pgd_pfn(pgd_t pgd) 635 { 636 unsigned long origin_mask; 637 638 origin_mask = _REGION_ENTRY_ORIGIN; 639 return (pgd_val(pgd) & origin_mask) >> PAGE_SHIFT; 640 } 641 642 static inline int p4d_folded(p4d_t p4d) 643 { 644 return (p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2; 645 } 646 647 static inline int p4d_present(p4d_t p4d) 648 { 649 if (p4d_folded(p4d)) 650 return 1; 651 return (p4d_val(p4d) & _REGION_ENTRY_ORIGIN) != 0UL; 652 } 653 654 static inline int p4d_none(p4d_t p4d) 655 { 656 if (p4d_folded(p4d)) 657 return 0; 658 return p4d_val(p4d) == _REGION2_ENTRY_EMPTY; 659 } 660 661 static inline unsigned long p4d_pfn(p4d_t p4d) 662 { 663 unsigned long origin_mask; 664 665 origin_mask = _REGION_ENTRY_ORIGIN; 666 return (p4d_val(p4d) & origin_mask) >> PAGE_SHIFT; 667 } 668 669 static inline int pud_folded(pud_t pud) 670 { 671 return (pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3; 672 } 673 674 static inline int pud_present(pud_t pud) 675 { 676 if (pud_folded(pud)) 677 return 1; 678 return (pud_val(pud) & _REGION_ENTRY_ORIGIN) != 0UL; 679 } 680 681 static inline int pud_none(pud_t pud) 682 { 683 if (pud_folded(pud)) 684 return 0; 685 return pud_val(pud) == _REGION3_ENTRY_EMPTY; 686 } 687 688 #define pud_leaf pud_large 689 static inline int pud_large(pud_t pud) 690 { 691 if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) != _REGION_ENTRY_TYPE_R3) 692 return 0; 693 return !!(pud_val(pud) & _REGION3_ENTRY_LARGE); 694 } 695 696 #define pmd_leaf pmd_large 697 static inline int pmd_large(pmd_t pmd) 698 { 699 return (pmd_val(pmd) & _SEGMENT_ENTRY_LARGE) != 0; 700 } 701 702 static inline int pmd_bad(pmd_t pmd) 703 { 704 if ((pmd_val(pmd) & _SEGMENT_ENTRY_TYPE_MASK) > 0 || pmd_large(pmd)) 705 return 1; 706 return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS) != 0; 707 } 708 709 static inline int pud_bad(pud_t pud) 710 { 711 unsigned long type = pud_val(pud) & _REGION_ENTRY_TYPE_MASK; 712 713 if (type > _REGION_ENTRY_TYPE_R3 || pud_large(pud)) 714 return 1; 715 if (type < _REGION_ENTRY_TYPE_R3) 716 return 0; 717 return (pud_val(pud) & ~_REGION_ENTRY_BITS) != 0; 718 } 719 720 static inline int p4d_bad(p4d_t p4d) 721 { 722 unsigned long type = p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK; 723 724 if (type > _REGION_ENTRY_TYPE_R2) 725 return 1; 726 if (type < _REGION_ENTRY_TYPE_R2) 727 return 0; 728 return (p4d_val(p4d) & ~_REGION_ENTRY_BITS) != 0; 729 } 730 731 static inline int pmd_present(pmd_t pmd) 732 { 733 return pmd_val(pmd) != _SEGMENT_ENTRY_EMPTY; 734 } 735 736 static inline int pmd_none(pmd_t pmd) 737 { 738 return pmd_val(pmd) == _SEGMENT_ENTRY_EMPTY; 739 } 740 741 #define pmd_write pmd_write 742 static inline int pmd_write(pmd_t pmd) 743 { 744 return (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) != 0; 745 } 746 747 #define pud_write pud_write 748 static inline int pud_write(pud_t pud) 749 { 750 return (pud_val(pud) & _REGION3_ENTRY_WRITE) != 0; 751 } 752 753 static inline int pmd_dirty(pmd_t pmd) 754 { 755 return (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) != 0; 756 } 757 758 static inline int pmd_young(pmd_t pmd) 759 { 760 return (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) != 0; 761 } 762 763 static inline int pte_present(pte_t pte) 764 { 765 /* Bit pattern: (pte & 0x001) == 0x001 */ 766 return (pte_val(pte) & _PAGE_PRESENT) != 0; 767 } 768 769 static inline int pte_none(pte_t pte) 770 { 771 /* Bit pattern: pte == 0x400 */ 772 return pte_val(pte) == _PAGE_INVALID; 773 } 774 775 static inline int pte_swap(pte_t pte) 776 { 777 /* Bit pattern: (pte & 0x201) == 0x200 */ 778 return (pte_val(pte) & (_PAGE_PROTECT | _PAGE_PRESENT)) 779 == _PAGE_PROTECT; 780 } 781 782 static inline int pte_special(pte_t pte) 783 { 784 return (pte_val(pte) & _PAGE_SPECIAL); 785 } 786 787 #define __HAVE_ARCH_PTE_SAME 788 static inline int pte_same(pte_t a, pte_t b) 789 { 790 return pte_val(a) == pte_val(b); 791 } 792 793 #ifdef CONFIG_NUMA_BALANCING 794 static inline int pte_protnone(pte_t pte) 795 { 796 return pte_present(pte) && !(pte_val(pte) & _PAGE_READ); 797 } 798 799 static inline int pmd_protnone(pmd_t pmd) 800 { 801 /* pmd_large(pmd) implies pmd_present(pmd) */ 802 return pmd_large(pmd) && !(pmd_val(pmd) & _SEGMENT_ENTRY_READ); 803 } 804 #endif 805 806 static inline int pte_soft_dirty(pte_t pte) 807 { 808 return pte_val(pte) & _PAGE_SOFT_DIRTY; 809 } 810 #define pte_swp_soft_dirty pte_soft_dirty 811 812 static inline pte_t pte_mksoft_dirty(pte_t pte) 813 { 814 pte_val(pte) |= _PAGE_SOFT_DIRTY; 815 return pte; 816 } 817 #define pte_swp_mksoft_dirty pte_mksoft_dirty 818 819 static inline pte_t pte_clear_soft_dirty(pte_t pte) 820 { 821 pte_val(pte) &= ~_PAGE_SOFT_DIRTY; 822 return pte; 823 } 824 #define pte_swp_clear_soft_dirty pte_clear_soft_dirty 825 826 static inline int pmd_soft_dirty(pmd_t pmd) 827 { 828 return pmd_val(pmd) & _SEGMENT_ENTRY_SOFT_DIRTY; 829 } 830 831 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) 832 { 833 pmd_val(pmd) |= _SEGMENT_ENTRY_SOFT_DIRTY; 834 return pmd; 835 } 836 837 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd) 838 { 839 pmd_val(pmd) &= ~_SEGMENT_ENTRY_SOFT_DIRTY; 840 return pmd; 841 } 842 843 /* 844 * query functions pte_write/pte_dirty/pte_young only work if 845 * pte_present() is true. Undefined behaviour if not.. 846 */ 847 static inline int pte_write(pte_t pte) 848 { 849 return (pte_val(pte) & _PAGE_WRITE) != 0; 850 } 851 852 static inline int pte_dirty(pte_t pte) 853 { 854 return (pte_val(pte) & _PAGE_DIRTY) != 0; 855 } 856 857 static inline int pte_young(pte_t pte) 858 { 859 return (pte_val(pte) & _PAGE_YOUNG) != 0; 860 } 861 862 #define __HAVE_ARCH_PTE_UNUSED 863 static inline int pte_unused(pte_t pte) 864 { 865 return pte_val(pte) & _PAGE_UNUSED; 866 } 867 868 /* 869 * pgd/pmd/pte modification functions 870 */ 871 872 static inline void pgd_clear(pgd_t *pgd) 873 { 874 if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R1) 875 pgd_val(*pgd) = _REGION1_ENTRY_EMPTY; 876 } 877 878 static inline void p4d_clear(p4d_t *p4d) 879 { 880 if ((p4d_val(*p4d) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2) 881 p4d_val(*p4d) = _REGION2_ENTRY_EMPTY; 882 } 883 884 static inline void pud_clear(pud_t *pud) 885 { 886 if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) 887 pud_val(*pud) = _REGION3_ENTRY_EMPTY; 888 } 889 890 static inline void pmd_clear(pmd_t *pmdp) 891 { 892 pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY; 893 } 894 895 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 896 { 897 pte_val(*ptep) = _PAGE_INVALID; 898 } 899 900 /* 901 * The following pte modification functions only work if 902 * pte_present() is true. Undefined behaviour if not.. 903 */ 904 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 905 { 906 pte_val(pte) &= _PAGE_CHG_MASK; 907 pte_val(pte) |= pgprot_val(newprot); 908 /* 909 * newprot for PAGE_NONE, PAGE_RO, PAGE_RX, PAGE_RW and PAGE_RWX 910 * has the invalid bit set, clear it again for readable, young pages 911 */ 912 if ((pte_val(pte) & _PAGE_YOUNG) && (pte_val(pte) & _PAGE_READ)) 913 pte_val(pte) &= ~_PAGE_INVALID; 914 /* 915 * newprot for PAGE_RO, PAGE_RX, PAGE_RW and PAGE_RWX has the page 916 * protection bit set, clear it again for writable, dirty pages 917 */ 918 if ((pte_val(pte) & _PAGE_DIRTY) && (pte_val(pte) & _PAGE_WRITE)) 919 pte_val(pte) &= ~_PAGE_PROTECT; 920 return pte; 921 } 922 923 static inline pte_t pte_wrprotect(pte_t pte) 924 { 925 pte_val(pte) &= ~_PAGE_WRITE; 926 pte_val(pte) |= _PAGE_PROTECT; 927 return pte; 928 } 929 930 static inline pte_t pte_mkwrite(pte_t pte) 931 { 932 pte_val(pte) |= _PAGE_WRITE; 933 if (pte_val(pte) & _PAGE_DIRTY) 934 pte_val(pte) &= ~_PAGE_PROTECT; 935 return pte; 936 } 937 938 static inline pte_t pte_mkclean(pte_t pte) 939 { 940 pte_val(pte) &= ~_PAGE_DIRTY; 941 pte_val(pte) |= _PAGE_PROTECT; 942 return pte; 943 } 944 945 static inline pte_t pte_mkdirty(pte_t pte) 946 { 947 pte_val(pte) |= _PAGE_DIRTY | _PAGE_SOFT_DIRTY; 948 if (pte_val(pte) & _PAGE_WRITE) 949 pte_val(pte) &= ~_PAGE_PROTECT; 950 return pte; 951 } 952 953 static inline pte_t pte_mkold(pte_t pte) 954 { 955 pte_val(pte) &= ~_PAGE_YOUNG; 956 pte_val(pte) |= _PAGE_INVALID; 957 return pte; 958 } 959 960 static inline pte_t pte_mkyoung(pte_t pte) 961 { 962 pte_val(pte) |= _PAGE_YOUNG; 963 if (pte_val(pte) & _PAGE_READ) 964 pte_val(pte) &= ~_PAGE_INVALID; 965 return pte; 966 } 967 968 static inline pte_t pte_mkspecial(pte_t pte) 969 { 970 pte_val(pte) |= _PAGE_SPECIAL; 971 return pte; 972 } 973 974 #ifdef CONFIG_HUGETLB_PAGE 975 static inline pte_t pte_mkhuge(pte_t pte) 976 { 977 pte_val(pte) |= _PAGE_LARGE; 978 return pte; 979 } 980 #endif 981 982 #define IPTE_GLOBAL 0 983 #define IPTE_LOCAL 1 984 985 #define IPTE_NODAT 0x400 986 #define IPTE_GUEST_ASCE 0x800 987 988 static __always_inline void __ptep_ipte(unsigned long address, pte_t *ptep, 989 unsigned long opt, unsigned long asce, 990 int local) 991 { 992 unsigned long pto = (unsigned long) ptep; 993 994 if (__builtin_constant_p(opt) && opt == 0) { 995 /* Invalidation + TLB flush for the pte */ 996 asm volatile( 997 " .insn rrf,0xb2210000,%[r1],%[r2],0,%[m4]" 998 : "+m" (*ptep) : [r1] "a" (pto), [r2] "a" (address), 999 [m4] "i" (local)); 1000 return; 1001 } 1002 1003 /* Invalidate ptes with options + TLB flush of the ptes */ 1004 opt = opt | (asce & _ASCE_ORIGIN); 1005 asm volatile( 1006 " .insn rrf,0xb2210000,%[r1],%[r2],%[r3],%[m4]" 1007 : [r2] "+a" (address), [r3] "+a" (opt) 1008 : [r1] "a" (pto), [m4] "i" (local) : "memory"); 1009 } 1010 1011 static __always_inline void __ptep_ipte_range(unsigned long address, int nr, 1012 pte_t *ptep, int local) 1013 { 1014 unsigned long pto = (unsigned long) ptep; 1015 1016 /* Invalidate a range of ptes + TLB flush of the ptes */ 1017 do { 1018 asm volatile( 1019 " .insn rrf,0xb2210000,%[r1],%[r2],%[r3],%[m4]" 1020 : [r2] "+a" (address), [r3] "+a" (nr) 1021 : [r1] "a" (pto), [m4] "i" (local) : "memory"); 1022 } while (nr != 255); 1023 } 1024 1025 /* 1026 * This is hard to understand. ptep_get_and_clear and ptep_clear_flush 1027 * both clear the TLB for the unmapped pte. The reason is that 1028 * ptep_get_and_clear is used in common code (e.g. change_pte_range) 1029 * to modify an active pte. The sequence is 1030 * 1) ptep_get_and_clear 1031 * 2) set_pte_at 1032 * 3) flush_tlb_range 1033 * On s390 the tlb needs to get flushed with the modification of the pte 1034 * if the pte is active. The only way how this can be implemented is to 1035 * have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range 1036 * is a nop. 1037 */ 1038 pte_t ptep_xchg_direct(struct mm_struct *, unsigned long, pte_t *, pte_t); 1039 pte_t ptep_xchg_lazy(struct mm_struct *, unsigned long, pte_t *, pte_t); 1040 1041 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 1042 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, 1043 unsigned long addr, pte_t *ptep) 1044 { 1045 pte_t pte = *ptep; 1046 1047 pte = ptep_xchg_direct(vma->vm_mm, addr, ptep, pte_mkold(pte)); 1048 return pte_young(pte); 1049 } 1050 1051 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 1052 static inline int ptep_clear_flush_young(struct vm_area_struct *vma, 1053 unsigned long address, pte_t *ptep) 1054 { 1055 return ptep_test_and_clear_young(vma, address, ptep); 1056 } 1057 1058 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 1059 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, 1060 unsigned long addr, pte_t *ptep) 1061 { 1062 pte_t res; 1063 1064 res = ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID)); 1065 if (mm_is_protected(mm) && pte_present(res)) 1066 uv_convert_from_secure(pte_val(res) & PAGE_MASK); 1067 return res; 1068 } 1069 1070 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION 1071 pte_t ptep_modify_prot_start(struct vm_area_struct *, unsigned long, pte_t *); 1072 void ptep_modify_prot_commit(struct vm_area_struct *, unsigned long, 1073 pte_t *, pte_t, pte_t); 1074 1075 #define __HAVE_ARCH_PTEP_CLEAR_FLUSH 1076 static inline pte_t ptep_clear_flush(struct vm_area_struct *vma, 1077 unsigned long addr, pte_t *ptep) 1078 { 1079 pte_t res; 1080 1081 res = ptep_xchg_direct(vma->vm_mm, addr, ptep, __pte(_PAGE_INVALID)); 1082 if (mm_is_protected(vma->vm_mm) && pte_present(res)) 1083 uv_convert_from_secure(pte_val(res) & PAGE_MASK); 1084 return res; 1085 } 1086 1087 /* 1088 * The batched pte unmap code uses ptep_get_and_clear_full to clear the 1089 * ptes. Here an optimization is possible. tlb_gather_mmu flushes all 1090 * tlbs of an mm if it can guarantee that the ptes of the mm_struct 1091 * cannot be accessed while the batched unmap is running. In this case 1092 * full==1 and a simple pte_clear is enough. See tlb.h. 1093 */ 1094 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL 1095 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, 1096 unsigned long addr, 1097 pte_t *ptep, int full) 1098 { 1099 pte_t res; 1100 1101 if (full) { 1102 res = *ptep; 1103 *ptep = __pte(_PAGE_INVALID); 1104 } else { 1105 res = ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID)); 1106 } 1107 if (mm_is_protected(mm) && pte_present(res)) 1108 uv_convert_from_secure(pte_val(res) & PAGE_MASK); 1109 return res; 1110 } 1111 1112 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 1113 static inline void ptep_set_wrprotect(struct mm_struct *mm, 1114 unsigned long addr, pte_t *ptep) 1115 { 1116 pte_t pte = *ptep; 1117 1118 if (pte_write(pte)) 1119 ptep_xchg_lazy(mm, addr, ptep, pte_wrprotect(pte)); 1120 } 1121 1122 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 1123 static inline int ptep_set_access_flags(struct vm_area_struct *vma, 1124 unsigned long addr, pte_t *ptep, 1125 pte_t entry, int dirty) 1126 { 1127 if (pte_same(*ptep, entry)) 1128 return 0; 1129 ptep_xchg_direct(vma->vm_mm, addr, ptep, entry); 1130 return 1; 1131 } 1132 1133 /* 1134 * Additional functions to handle KVM guest page tables 1135 */ 1136 void ptep_set_pte_at(struct mm_struct *mm, unsigned long addr, 1137 pte_t *ptep, pte_t entry); 1138 void ptep_set_notify(struct mm_struct *mm, unsigned long addr, pte_t *ptep); 1139 void ptep_notify(struct mm_struct *mm, unsigned long addr, 1140 pte_t *ptep, unsigned long bits); 1141 int ptep_force_prot(struct mm_struct *mm, unsigned long gaddr, 1142 pte_t *ptep, int prot, unsigned long bit); 1143 void ptep_zap_unused(struct mm_struct *mm, unsigned long addr, 1144 pte_t *ptep , int reset); 1145 void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep); 1146 int ptep_shadow_pte(struct mm_struct *mm, unsigned long saddr, 1147 pte_t *sptep, pte_t *tptep, pte_t pte); 1148 void ptep_unshadow_pte(struct mm_struct *mm, unsigned long saddr, pte_t *ptep); 1149 1150 bool ptep_test_and_clear_uc(struct mm_struct *mm, unsigned long address, 1151 pte_t *ptep); 1152 int set_guest_storage_key(struct mm_struct *mm, unsigned long addr, 1153 unsigned char key, bool nq); 1154 int cond_set_guest_storage_key(struct mm_struct *mm, unsigned long addr, 1155 unsigned char key, unsigned char *oldkey, 1156 bool nq, bool mr, bool mc); 1157 int reset_guest_reference_bit(struct mm_struct *mm, unsigned long addr); 1158 int get_guest_storage_key(struct mm_struct *mm, unsigned long addr, 1159 unsigned char *key); 1160 1161 int set_pgste_bits(struct mm_struct *mm, unsigned long addr, 1162 unsigned long bits, unsigned long value); 1163 int get_pgste(struct mm_struct *mm, unsigned long hva, unsigned long *pgstep); 1164 int pgste_perform_essa(struct mm_struct *mm, unsigned long hva, int orc, 1165 unsigned long *oldpte, unsigned long *oldpgste); 1166 void gmap_pmdp_csp(struct mm_struct *mm, unsigned long vmaddr); 1167 void gmap_pmdp_invalidate(struct mm_struct *mm, unsigned long vmaddr); 1168 void gmap_pmdp_idte_local(struct mm_struct *mm, unsigned long vmaddr); 1169 void gmap_pmdp_idte_global(struct mm_struct *mm, unsigned long vmaddr); 1170 1171 #define pgprot_writecombine pgprot_writecombine 1172 pgprot_t pgprot_writecombine(pgprot_t prot); 1173 1174 #define pgprot_writethrough pgprot_writethrough 1175 pgprot_t pgprot_writethrough(pgprot_t prot); 1176 1177 /* 1178 * Certain architectures need to do special things when PTEs 1179 * within a page table are directly modified. Thus, the following 1180 * hook is made available. 1181 */ 1182 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 1183 pte_t *ptep, pte_t entry) 1184 { 1185 if (pte_present(entry)) 1186 pte_val(entry) &= ~_PAGE_UNUSED; 1187 if (mm_has_pgste(mm)) 1188 ptep_set_pte_at(mm, addr, ptep, entry); 1189 else 1190 *ptep = entry; 1191 } 1192 1193 /* 1194 * Conversion functions: convert a page and protection to a page entry, 1195 * and a page entry and page directory to the page they refer to. 1196 */ 1197 static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) 1198 { 1199 pte_t __pte; 1200 1201 pte_val(__pte) = physpage | pgprot_val(pgprot); 1202 if (!MACHINE_HAS_NX) 1203 pte_val(__pte) &= ~_PAGE_NOEXEC; 1204 return pte_mkyoung(__pte); 1205 } 1206 1207 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot) 1208 { 1209 unsigned long physpage = page_to_phys(page); 1210 pte_t __pte = mk_pte_phys(physpage, pgprot); 1211 1212 if (pte_write(__pte) && PageDirty(page)) 1213 __pte = pte_mkdirty(__pte); 1214 return __pte; 1215 } 1216 1217 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) 1218 #define p4d_index(address) (((address) >> P4D_SHIFT) & (PTRS_PER_P4D-1)) 1219 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) 1220 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) 1221 1222 #define p4d_deref(pud) ((unsigned long)__va(p4d_val(pud) & _REGION_ENTRY_ORIGIN)) 1223 #define pgd_deref(pgd) ((unsigned long)__va(pgd_val(pgd) & _REGION_ENTRY_ORIGIN)) 1224 1225 static inline unsigned long pmd_deref(pmd_t pmd) 1226 { 1227 unsigned long origin_mask; 1228 1229 origin_mask = _SEGMENT_ENTRY_ORIGIN; 1230 if (pmd_large(pmd)) 1231 origin_mask = _SEGMENT_ENTRY_ORIGIN_LARGE; 1232 return (unsigned long)__va(pmd_val(pmd) & origin_mask); 1233 } 1234 1235 static inline unsigned long pmd_pfn(pmd_t pmd) 1236 { 1237 return __pa(pmd_deref(pmd)) >> PAGE_SHIFT; 1238 } 1239 1240 static inline unsigned long pud_deref(pud_t pud) 1241 { 1242 unsigned long origin_mask; 1243 1244 origin_mask = _REGION_ENTRY_ORIGIN; 1245 if (pud_large(pud)) 1246 origin_mask = _REGION3_ENTRY_ORIGIN_LARGE; 1247 return (unsigned long)__va(pud_val(pud) & origin_mask); 1248 } 1249 1250 static inline unsigned long pud_pfn(pud_t pud) 1251 { 1252 return __pa(pud_deref(pud)) >> PAGE_SHIFT; 1253 } 1254 1255 /* 1256 * The pgd_offset function *always* adds the index for the top-level 1257 * region/segment table. This is done to get a sequence like the 1258 * following to work: 1259 * pgdp = pgd_offset(current->mm, addr); 1260 * pgd = READ_ONCE(*pgdp); 1261 * p4dp = p4d_offset(&pgd, addr); 1262 * ... 1263 * The subsequent p4d_offset, pud_offset and pmd_offset functions 1264 * only add an index if they dereferenced the pointer. 1265 */ 1266 static inline pgd_t *pgd_offset_raw(pgd_t *pgd, unsigned long address) 1267 { 1268 unsigned long rste; 1269 unsigned int shift; 1270 1271 /* Get the first entry of the top level table */ 1272 rste = pgd_val(*pgd); 1273 /* Pick up the shift from the table type of the first entry */ 1274 shift = ((rste & _REGION_ENTRY_TYPE_MASK) >> 2) * 11 + 20; 1275 return pgd + ((address >> shift) & (PTRS_PER_PGD - 1)); 1276 } 1277 1278 #define pgd_offset(mm, address) pgd_offset_raw(READ_ONCE((mm)->pgd), address) 1279 1280 static inline p4d_t *p4d_offset_lockless(pgd_t *pgdp, pgd_t pgd, unsigned long address) 1281 { 1282 if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) >= _REGION_ENTRY_TYPE_R1) 1283 return (p4d_t *) pgd_deref(pgd) + p4d_index(address); 1284 return (p4d_t *) pgdp; 1285 } 1286 #define p4d_offset_lockless p4d_offset_lockless 1287 1288 static inline p4d_t *p4d_offset(pgd_t *pgdp, unsigned long address) 1289 { 1290 return p4d_offset_lockless(pgdp, *pgdp, address); 1291 } 1292 1293 static inline pud_t *pud_offset_lockless(p4d_t *p4dp, p4d_t p4d, unsigned long address) 1294 { 1295 if ((p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK) >= _REGION_ENTRY_TYPE_R2) 1296 return (pud_t *) p4d_deref(p4d) + pud_index(address); 1297 return (pud_t *) p4dp; 1298 } 1299 #define pud_offset_lockless pud_offset_lockless 1300 1301 static inline pud_t *pud_offset(p4d_t *p4dp, unsigned long address) 1302 { 1303 return pud_offset_lockless(p4dp, *p4dp, address); 1304 } 1305 #define pud_offset pud_offset 1306 1307 static inline pmd_t *pmd_offset_lockless(pud_t *pudp, pud_t pud, unsigned long address) 1308 { 1309 if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) >= _REGION_ENTRY_TYPE_R3) 1310 return (pmd_t *) pud_deref(pud) + pmd_index(address); 1311 return (pmd_t *) pudp; 1312 } 1313 #define pmd_offset_lockless pmd_offset_lockless 1314 1315 static inline pmd_t *pmd_offset(pud_t *pudp, unsigned long address) 1316 { 1317 return pmd_offset_lockless(pudp, *pudp, address); 1318 } 1319 #define pmd_offset pmd_offset 1320 1321 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 1322 { 1323 return (unsigned long) pmd_deref(pmd); 1324 } 1325 1326 static inline bool gup_fast_permitted(unsigned long start, unsigned long end) 1327 { 1328 return end <= current->mm->context.asce_limit; 1329 } 1330 #define gup_fast_permitted gup_fast_permitted 1331 1332 #define pfn_pte(pfn, pgprot) mk_pte_phys(((pfn) << PAGE_SHIFT), (pgprot)) 1333 #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) 1334 #define pte_page(x) pfn_to_page(pte_pfn(x)) 1335 1336 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd)) 1337 #define pud_page(pud) pfn_to_page(pud_pfn(pud)) 1338 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d)) 1339 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd)) 1340 1341 static inline pmd_t pmd_wrprotect(pmd_t pmd) 1342 { 1343 pmd_val(pmd) &= ~_SEGMENT_ENTRY_WRITE; 1344 pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT; 1345 return pmd; 1346 } 1347 1348 static inline pmd_t pmd_mkwrite(pmd_t pmd) 1349 { 1350 pmd_val(pmd) |= _SEGMENT_ENTRY_WRITE; 1351 if (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) 1352 pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT; 1353 return pmd; 1354 } 1355 1356 static inline pmd_t pmd_mkclean(pmd_t pmd) 1357 { 1358 pmd_val(pmd) &= ~_SEGMENT_ENTRY_DIRTY; 1359 pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT; 1360 return pmd; 1361 } 1362 1363 static inline pmd_t pmd_mkdirty(pmd_t pmd) 1364 { 1365 pmd_val(pmd) |= _SEGMENT_ENTRY_DIRTY | _SEGMENT_ENTRY_SOFT_DIRTY; 1366 if (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) 1367 pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT; 1368 return pmd; 1369 } 1370 1371 static inline pud_t pud_wrprotect(pud_t pud) 1372 { 1373 pud_val(pud) &= ~_REGION3_ENTRY_WRITE; 1374 pud_val(pud) |= _REGION_ENTRY_PROTECT; 1375 return pud; 1376 } 1377 1378 static inline pud_t pud_mkwrite(pud_t pud) 1379 { 1380 pud_val(pud) |= _REGION3_ENTRY_WRITE; 1381 if (pud_val(pud) & _REGION3_ENTRY_DIRTY) 1382 pud_val(pud) &= ~_REGION_ENTRY_PROTECT; 1383 return pud; 1384 } 1385 1386 static inline pud_t pud_mkclean(pud_t pud) 1387 { 1388 pud_val(pud) &= ~_REGION3_ENTRY_DIRTY; 1389 pud_val(pud) |= _REGION_ENTRY_PROTECT; 1390 return pud; 1391 } 1392 1393 static inline pud_t pud_mkdirty(pud_t pud) 1394 { 1395 pud_val(pud) |= _REGION3_ENTRY_DIRTY | _REGION3_ENTRY_SOFT_DIRTY; 1396 if (pud_val(pud) & _REGION3_ENTRY_WRITE) 1397 pud_val(pud) &= ~_REGION_ENTRY_PROTECT; 1398 return pud; 1399 } 1400 1401 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE) 1402 static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot) 1403 { 1404 /* 1405 * pgprot is PAGE_NONE, PAGE_RO, PAGE_RX, PAGE_RW or PAGE_RWX 1406 * (see __Pxxx / __Sxxx). Convert to segment table entry format. 1407 */ 1408 if (pgprot_val(pgprot) == pgprot_val(PAGE_NONE)) 1409 return pgprot_val(SEGMENT_NONE); 1410 if (pgprot_val(pgprot) == pgprot_val(PAGE_RO)) 1411 return pgprot_val(SEGMENT_RO); 1412 if (pgprot_val(pgprot) == pgprot_val(PAGE_RX)) 1413 return pgprot_val(SEGMENT_RX); 1414 if (pgprot_val(pgprot) == pgprot_val(PAGE_RW)) 1415 return pgprot_val(SEGMENT_RW); 1416 return pgprot_val(SEGMENT_RWX); 1417 } 1418 1419 static inline pmd_t pmd_mkyoung(pmd_t pmd) 1420 { 1421 pmd_val(pmd) |= _SEGMENT_ENTRY_YOUNG; 1422 if (pmd_val(pmd) & _SEGMENT_ENTRY_READ) 1423 pmd_val(pmd) &= ~_SEGMENT_ENTRY_INVALID; 1424 return pmd; 1425 } 1426 1427 static inline pmd_t pmd_mkold(pmd_t pmd) 1428 { 1429 pmd_val(pmd) &= ~_SEGMENT_ENTRY_YOUNG; 1430 pmd_val(pmd) |= _SEGMENT_ENTRY_INVALID; 1431 return pmd; 1432 } 1433 1434 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 1435 { 1436 pmd_val(pmd) &= _SEGMENT_ENTRY_ORIGIN_LARGE | 1437 _SEGMENT_ENTRY_DIRTY | _SEGMENT_ENTRY_YOUNG | 1438 _SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_SOFT_DIRTY; 1439 pmd_val(pmd) |= massage_pgprot_pmd(newprot); 1440 if (!(pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY)) 1441 pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT; 1442 if (!(pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG)) 1443 pmd_val(pmd) |= _SEGMENT_ENTRY_INVALID; 1444 return pmd; 1445 } 1446 1447 static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot) 1448 { 1449 pmd_t __pmd; 1450 pmd_val(__pmd) = physpage + massage_pgprot_pmd(pgprot); 1451 return __pmd; 1452 } 1453 1454 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLB_PAGE */ 1455 1456 static inline void __pmdp_csp(pmd_t *pmdp) 1457 { 1458 csp((unsigned int *)pmdp + 1, pmd_val(*pmdp), 1459 pmd_val(*pmdp) | _SEGMENT_ENTRY_INVALID); 1460 } 1461 1462 #define IDTE_GLOBAL 0 1463 #define IDTE_LOCAL 1 1464 1465 #define IDTE_PTOA 0x0800 1466 #define IDTE_NODAT 0x1000 1467 #define IDTE_GUEST_ASCE 0x2000 1468 1469 static __always_inline void __pmdp_idte(unsigned long addr, pmd_t *pmdp, 1470 unsigned long opt, unsigned long asce, 1471 int local) 1472 { 1473 unsigned long sto; 1474 1475 sto = (unsigned long) pmdp - pmd_index(addr) * sizeof(pmd_t); 1476 if (__builtin_constant_p(opt) && opt == 0) { 1477 /* flush without guest asce */ 1478 asm volatile( 1479 " .insn rrf,0xb98e0000,%[r1],%[r2],0,%[m4]" 1480 : "+m" (*pmdp) 1481 : [r1] "a" (sto), [r2] "a" ((addr & HPAGE_MASK)), 1482 [m4] "i" (local) 1483 : "cc" ); 1484 } else { 1485 /* flush with guest asce */ 1486 asm volatile( 1487 " .insn rrf,0xb98e0000,%[r1],%[r2],%[r3],%[m4]" 1488 : "+m" (*pmdp) 1489 : [r1] "a" (sto), [r2] "a" ((addr & HPAGE_MASK) | opt), 1490 [r3] "a" (asce), [m4] "i" (local) 1491 : "cc" ); 1492 } 1493 } 1494 1495 static __always_inline void __pudp_idte(unsigned long addr, pud_t *pudp, 1496 unsigned long opt, unsigned long asce, 1497 int local) 1498 { 1499 unsigned long r3o; 1500 1501 r3o = (unsigned long) pudp - pud_index(addr) * sizeof(pud_t); 1502 r3o |= _ASCE_TYPE_REGION3; 1503 if (__builtin_constant_p(opt) && opt == 0) { 1504 /* flush without guest asce */ 1505 asm volatile( 1506 " .insn rrf,0xb98e0000,%[r1],%[r2],0,%[m4]" 1507 : "+m" (*pudp) 1508 : [r1] "a" (r3o), [r2] "a" ((addr & PUD_MASK)), 1509 [m4] "i" (local) 1510 : "cc"); 1511 } else { 1512 /* flush with guest asce */ 1513 asm volatile( 1514 " .insn rrf,0xb98e0000,%[r1],%[r2],%[r3],%[m4]" 1515 : "+m" (*pudp) 1516 : [r1] "a" (r3o), [r2] "a" ((addr & PUD_MASK) | opt), 1517 [r3] "a" (asce), [m4] "i" (local) 1518 : "cc" ); 1519 } 1520 } 1521 1522 pmd_t pmdp_xchg_direct(struct mm_struct *, unsigned long, pmd_t *, pmd_t); 1523 pmd_t pmdp_xchg_lazy(struct mm_struct *, unsigned long, pmd_t *, pmd_t); 1524 pud_t pudp_xchg_direct(struct mm_struct *, unsigned long, pud_t *, pud_t); 1525 1526 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 1527 1528 #define __HAVE_ARCH_PGTABLE_DEPOSIT 1529 void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, 1530 pgtable_t pgtable); 1531 1532 #define __HAVE_ARCH_PGTABLE_WITHDRAW 1533 pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); 1534 1535 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS 1536 static inline int pmdp_set_access_flags(struct vm_area_struct *vma, 1537 unsigned long addr, pmd_t *pmdp, 1538 pmd_t entry, int dirty) 1539 { 1540 VM_BUG_ON(addr & ~HPAGE_MASK); 1541 1542 entry = pmd_mkyoung(entry); 1543 if (dirty) 1544 entry = pmd_mkdirty(entry); 1545 if (pmd_val(*pmdp) == pmd_val(entry)) 1546 return 0; 1547 pmdp_xchg_direct(vma->vm_mm, addr, pmdp, entry); 1548 return 1; 1549 } 1550 1551 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG 1552 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, 1553 unsigned long addr, pmd_t *pmdp) 1554 { 1555 pmd_t pmd = *pmdp; 1556 1557 pmd = pmdp_xchg_direct(vma->vm_mm, addr, pmdp, pmd_mkold(pmd)); 1558 return pmd_young(pmd); 1559 } 1560 1561 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH 1562 static inline int pmdp_clear_flush_young(struct vm_area_struct *vma, 1563 unsigned long addr, pmd_t *pmdp) 1564 { 1565 VM_BUG_ON(addr & ~HPAGE_MASK); 1566 return pmdp_test_and_clear_young(vma, addr, pmdp); 1567 } 1568 1569 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, 1570 pmd_t *pmdp, pmd_t entry) 1571 { 1572 if (!MACHINE_HAS_NX) 1573 pmd_val(entry) &= ~_SEGMENT_ENTRY_NOEXEC; 1574 *pmdp = entry; 1575 } 1576 1577 static inline pmd_t pmd_mkhuge(pmd_t pmd) 1578 { 1579 pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE; 1580 pmd_val(pmd) |= _SEGMENT_ENTRY_YOUNG; 1581 pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT; 1582 return pmd; 1583 } 1584 1585 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 1586 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 1587 unsigned long addr, pmd_t *pmdp) 1588 { 1589 return pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY)); 1590 } 1591 1592 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL 1593 static inline pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma, 1594 unsigned long addr, 1595 pmd_t *pmdp, int full) 1596 { 1597 if (full) { 1598 pmd_t pmd = *pmdp; 1599 *pmdp = __pmd(_SEGMENT_ENTRY_EMPTY); 1600 return pmd; 1601 } 1602 return pmdp_xchg_lazy(vma->vm_mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY)); 1603 } 1604 1605 #define __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH 1606 static inline pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, 1607 unsigned long addr, pmd_t *pmdp) 1608 { 1609 return pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp); 1610 } 1611 1612 #define __HAVE_ARCH_PMDP_INVALIDATE 1613 static inline pmd_t pmdp_invalidate(struct vm_area_struct *vma, 1614 unsigned long addr, pmd_t *pmdp) 1615 { 1616 pmd_t pmd = __pmd(pmd_val(*pmdp) | _SEGMENT_ENTRY_INVALID); 1617 1618 return pmdp_xchg_direct(vma->vm_mm, addr, pmdp, pmd); 1619 } 1620 1621 #define __HAVE_ARCH_PMDP_SET_WRPROTECT 1622 static inline void pmdp_set_wrprotect(struct mm_struct *mm, 1623 unsigned long addr, pmd_t *pmdp) 1624 { 1625 pmd_t pmd = *pmdp; 1626 1627 if (pmd_write(pmd)) 1628 pmd = pmdp_xchg_lazy(mm, addr, pmdp, pmd_wrprotect(pmd)); 1629 } 1630 1631 static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, 1632 unsigned long address, 1633 pmd_t *pmdp) 1634 { 1635 return pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); 1636 } 1637 #define pmdp_collapse_flush pmdp_collapse_flush 1638 1639 #define pfn_pmd(pfn, pgprot) mk_pmd_phys(((pfn) << PAGE_SHIFT), (pgprot)) 1640 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot)) 1641 1642 static inline int pmd_trans_huge(pmd_t pmd) 1643 { 1644 return pmd_val(pmd) & _SEGMENT_ENTRY_LARGE; 1645 } 1646 1647 #define has_transparent_hugepage has_transparent_hugepage 1648 static inline int has_transparent_hugepage(void) 1649 { 1650 return MACHINE_HAS_EDAT1 ? 1 : 0; 1651 } 1652 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 1653 1654 /* 1655 * 64 bit swap entry format: 1656 * A page-table entry has some bits we have to treat in a special way. 1657 * Bits 52 and bit 55 have to be zero, otherwise a specification 1658 * exception will occur instead of a page translation exception. The 1659 * specification exception has the bad habit not to store necessary 1660 * information in the lowcore. 1661 * Bits 54 and 63 are used to indicate the page type. 1662 * A swap pte is indicated by bit pattern (pte & 0x201) == 0x200 1663 * This leaves the bits 0-51 and bits 56-62 to store type and offset. 1664 * We use the 5 bits from 57-61 for the type and the 52 bits from 0-51 1665 * for the offset. 1666 * | offset |01100|type |00| 1667 * |0000000000111111111122222222223333333333444444444455|55555|55566|66| 1668 * |0123456789012345678901234567890123456789012345678901|23456|78901|23| 1669 */ 1670 1671 #define __SWP_OFFSET_MASK ((1UL << 52) - 1) 1672 #define __SWP_OFFSET_SHIFT 12 1673 #define __SWP_TYPE_MASK ((1UL << 5) - 1) 1674 #define __SWP_TYPE_SHIFT 2 1675 1676 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) 1677 { 1678 pte_t pte; 1679 1680 pte_val(pte) = _PAGE_INVALID | _PAGE_PROTECT; 1681 pte_val(pte) |= (offset & __SWP_OFFSET_MASK) << __SWP_OFFSET_SHIFT; 1682 pte_val(pte) |= (type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT; 1683 return pte; 1684 } 1685 1686 static inline unsigned long __swp_type(swp_entry_t entry) 1687 { 1688 return (entry.val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK; 1689 } 1690 1691 static inline unsigned long __swp_offset(swp_entry_t entry) 1692 { 1693 return (entry.val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK; 1694 } 1695 1696 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) 1697 { 1698 return (swp_entry_t) { pte_val(mk_swap_pte(type, offset)) }; 1699 } 1700 1701 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 1702 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 1703 1704 #define kern_addr_valid(addr) (1) 1705 1706 extern int vmem_add_mapping(unsigned long start, unsigned long size); 1707 extern void vmem_remove_mapping(unsigned long start, unsigned long size); 1708 extern int s390_enable_sie(void); 1709 extern int s390_enable_skey(void); 1710 extern void s390_reset_cmma(struct mm_struct *mm); 1711 1712 /* s390 has a private copy of get unmapped area to deal with cache synonyms */ 1713 #define HAVE_ARCH_UNMAPPED_AREA 1714 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 1715 1716 #endif /* _S390_PAGE_H */ 1717