1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _SPARC_PGTABLE_H 3 #define _SPARC_PGTABLE_H 4 5 /* asm/pgtable.h: Defines and functions used to work 6 * with Sparc page tables. 7 * 8 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 9 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 10 */ 11 12 #include <linux/const.h> 13 14 #define PMD_SHIFT 18 15 #define PMD_SIZE (1UL << PMD_SHIFT) 16 #define PMD_MASK (~(PMD_SIZE-1)) 17 #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) 18 19 #define PGDIR_SHIFT 24 20 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 21 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 22 #define PGDIR_ALIGN(__addr) (((__addr) + ~PGDIR_MASK) & PGDIR_MASK) 23 24 #ifndef __ASSEMBLY__ 25 #include <asm-generic/pgtable-nopud.h> 26 27 #include <linux/spinlock.h> 28 #include <linux/mm_types.h> 29 #include <asm/types.h> 30 #include <asm/pgtsrmmu.h> 31 #include <asm/vaddrs.h> 32 #include <asm/oplib.h> 33 #include <asm/cpu_type.h> 34 35 36 struct vm_area_struct; 37 struct page; 38 39 void load_mmu(void); 40 unsigned long calc_highpages(void); 41 unsigned long __init bootmem_init(unsigned long *pages_avail); 42 43 #define pte_ERROR(e) __builtin_trap() 44 #define pmd_ERROR(e) __builtin_trap() 45 #define pgd_ERROR(e) __builtin_trap() 46 47 #define PTRS_PER_PTE 64 48 #define PTRS_PER_PMD 64 49 #define PTRS_PER_PGD 256 50 #define USER_PTRS_PER_PGD PAGE_OFFSET / PGDIR_SIZE 51 #define FIRST_USER_ADDRESS 0UL 52 #define PTE_SIZE (PTRS_PER_PTE*4) 53 54 #define PAGE_NONE SRMMU_PAGE_NONE 55 #define PAGE_SHARED SRMMU_PAGE_SHARED 56 #define PAGE_COPY SRMMU_PAGE_COPY 57 #define PAGE_READONLY SRMMU_PAGE_RDONLY 58 #define PAGE_KERNEL SRMMU_PAGE_KERNEL 59 60 /* Top-level page directory - dummy used by init-mm. 61 * srmmu.c will assign the real one (which is dynamically sized) */ 62 #define swapper_pg_dir NULL 63 64 void paging_init(void); 65 66 extern unsigned long ptr_in_current_pgd; 67 68 /* xwr */ 69 #define __P000 PAGE_NONE 70 #define __P001 PAGE_READONLY 71 #define __P010 PAGE_COPY 72 #define __P011 PAGE_COPY 73 #define __P100 PAGE_READONLY 74 #define __P101 PAGE_READONLY 75 #define __P110 PAGE_COPY 76 #define __P111 PAGE_COPY 77 78 #define __S000 PAGE_NONE 79 #define __S001 PAGE_READONLY 80 #define __S010 PAGE_SHARED 81 #define __S011 PAGE_SHARED 82 #define __S100 PAGE_READONLY 83 #define __S101 PAGE_READONLY 84 #define __S110 PAGE_SHARED 85 #define __S111 PAGE_SHARED 86 87 /* First physical page can be anywhere, the following is needed so that 88 * va-->pa and vice versa conversions work properly without performance 89 * hit for all __pa()/__va() operations. 90 */ 91 extern unsigned long phys_base; 92 extern unsigned long pfn_base; 93 94 /* 95 * ZERO_PAGE is a global shared page that is always zero: used 96 * for zero-mapped memory areas etc.. 97 */ 98 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 99 100 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 101 102 /* 103 * In general all page table modifications should use the V8 atomic 104 * swap instruction. This insures the mmu and the cpu are in sync 105 * with respect to ref/mod bits in the page tables. 106 */ 107 static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value) 108 { 109 __asm__ __volatile__("swap [%2], %0" : 110 "=&r" (value) : "0" (value), "r" (addr) : "memory"); 111 return value; 112 } 113 114 /* Certain architectures need to do special things when pte's 115 * within a page table are directly modified. Thus, the following 116 * hook is made available. 117 */ 118 119 static inline void set_pte(pte_t *ptep, pte_t pteval) 120 { 121 srmmu_swap((unsigned long *)ptep, pte_val(pteval)); 122 } 123 124 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 125 126 static inline int srmmu_device_memory(unsigned long x) 127 { 128 return ((x & 0xF0000000) != 0); 129 } 130 131 static inline struct page *pmd_page(pmd_t pmd) 132 { 133 if (srmmu_device_memory(pmd_val(pmd))) 134 BUG(); 135 return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4)); 136 } 137 138 static inline unsigned long __pmd_page(pmd_t pmd) 139 { 140 unsigned long v; 141 142 if (srmmu_device_memory(pmd_val(pmd))) 143 BUG(); 144 145 v = pmd_val(pmd) & SRMMU_PTD_PMASK; 146 return (unsigned long)__nocache_va(v << 4); 147 } 148 149 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 150 { 151 unsigned long v = pmd_val(pmd) & SRMMU_PTD_PMASK; 152 return (unsigned long)__nocache_va(v << 4); 153 } 154 155 static inline unsigned long pud_page_vaddr(pud_t pud) 156 { 157 if (srmmu_device_memory(pud_val(pud))) { 158 return ~0; 159 } else { 160 unsigned long v = pud_val(pud) & SRMMU_PTD_PMASK; 161 return (unsigned long)__nocache_va(v << 4); 162 } 163 } 164 165 static inline int pte_present(pte_t pte) 166 { 167 return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE); 168 } 169 170 static inline int pte_none(pte_t pte) 171 { 172 return !pte_val(pte); 173 } 174 175 static inline void __pte_clear(pte_t *ptep) 176 { 177 set_pte(ptep, __pte(0)); 178 } 179 180 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 181 { 182 __pte_clear(ptep); 183 } 184 185 static inline int pmd_bad(pmd_t pmd) 186 { 187 return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; 188 } 189 190 static inline int pmd_present(pmd_t pmd) 191 { 192 return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); 193 } 194 195 static inline int pmd_none(pmd_t pmd) 196 { 197 return !pmd_val(pmd); 198 } 199 200 static inline void pmd_clear(pmd_t *pmdp) 201 { 202 set_pte((pte_t *)&pmd_val(*pmdp), __pte(0)); 203 } 204 205 static inline int pud_none(pud_t pud) 206 { 207 return !(pud_val(pud) & 0xFFFFFFF); 208 } 209 210 static inline int pud_bad(pud_t pud) 211 { 212 return (pud_val(pud) & SRMMU_ET_MASK) != SRMMU_ET_PTD; 213 } 214 215 static inline int pud_present(pud_t pud) 216 { 217 return ((pud_val(pud) & SRMMU_ET_MASK) == SRMMU_ET_PTD); 218 } 219 220 static inline void pud_clear(pud_t *pudp) 221 { 222 set_pte((pte_t *)pudp, __pte(0)); 223 } 224 225 /* 226 * The following only work if pte_present() is true. 227 * Undefined behaviour if not.. 228 */ 229 static inline int pte_write(pte_t pte) 230 { 231 return pte_val(pte) & SRMMU_WRITE; 232 } 233 234 static inline int pte_dirty(pte_t pte) 235 { 236 return pte_val(pte) & SRMMU_DIRTY; 237 } 238 239 static inline int pte_young(pte_t pte) 240 { 241 return pte_val(pte) & SRMMU_REF; 242 } 243 244 static inline pte_t pte_wrprotect(pte_t pte) 245 { 246 return __pte(pte_val(pte) & ~SRMMU_WRITE); 247 } 248 249 static inline pte_t pte_mkclean(pte_t pte) 250 { 251 return __pte(pte_val(pte) & ~SRMMU_DIRTY); 252 } 253 254 static inline pte_t pte_mkold(pte_t pte) 255 { 256 return __pte(pte_val(pte) & ~SRMMU_REF); 257 } 258 259 static inline pte_t pte_mkwrite(pte_t pte) 260 { 261 return __pte(pte_val(pte) | SRMMU_WRITE); 262 } 263 264 static inline pte_t pte_mkdirty(pte_t pte) 265 { 266 return __pte(pte_val(pte) | SRMMU_DIRTY); 267 } 268 269 static inline pte_t pte_mkyoung(pte_t pte) 270 { 271 return __pte(pte_val(pte) | SRMMU_REF); 272 } 273 274 #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) 275 276 static inline unsigned long pte_pfn(pte_t pte) 277 { 278 if (srmmu_device_memory(pte_val(pte))) { 279 /* Just return something that will cause 280 * pfn_valid() to return false. This makes 281 * copy_one_pte() to just directly copy to 282 * PTE over. 283 */ 284 return ~0UL; 285 } 286 return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4); 287 } 288 289 #define pte_page(pte) pfn_to_page(pte_pfn(pte)) 290 291 /* 292 * Conversion functions: convert a page and protection to a page entry, 293 * and a page entry and page directory to the page they refer to. 294 */ 295 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot) 296 { 297 return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot)); 298 } 299 300 static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot) 301 { 302 return __pte(((page) >> 4) | pgprot_val(pgprot)); 303 } 304 305 static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space) 306 { 307 return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot)); 308 } 309 310 #define pgprot_noncached pgprot_noncached 311 static inline pgprot_t pgprot_noncached(pgprot_t prot) 312 { 313 pgprot_val(prot) &= ~pgprot_val(__pgprot(SRMMU_CACHE)); 314 return prot; 315 } 316 317 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__; 318 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 319 { 320 return __pte((pte_val(pte) & SRMMU_CHG_MASK) | 321 pgprot_val(newprot)); 322 } 323 324 struct seq_file; 325 void mmu_info(struct seq_file *m); 326 327 /* Fault handler stuff... */ 328 #define FAULT_CODE_PROT 0x1 329 #define FAULT_CODE_WRITE 0x2 330 #define FAULT_CODE_USER 0x4 331 332 #define update_mmu_cache(vma, address, ptep) do { } while (0) 333 334 void srmmu_mapiorange(unsigned int bus, unsigned long xpa, 335 unsigned long xva, unsigned int len); 336 void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len); 337 338 /* Encode and de-code a swap entry */ 339 static inline unsigned long __swp_type(swp_entry_t entry) 340 { 341 return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK; 342 } 343 344 static inline unsigned long __swp_offset(swp_entry_t entry) 345 { 346 return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK; 347 } 348 349 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) 350 { 351 return (swp_entry_t) { 352 (type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT 353 | (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT }; 354 } 355 356 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 357 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 358 359 static inline unsigned long 360 __get_phys (unsigned long addr) 361 { 362 switch (sparc_cpu_model){ 363 case sun4m: 364 case sun4d: 365 return ((srmmu_get_pte (addr) & 0xffffff00) << 4); 366 default: 367 return 0; 368 } 369 } 370 371 static inline int 372 __get_iospace (unsigned long addr) 373 { 374 switch (sparc_cpu_model){ 375 case sun4m: 376 case sun4d: 377 return (srmmu_get_pte (addr) >> 28); 378 default: 379 return -1; 380 } 381 } 382 383 extern unsigned long *sparc_valid_addr_bitmap; 384 385 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 386 #define kern_addr_valid(addr) \ 387 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) 388 389 /* 390 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in 391 * its high 4 bits. These macros/functions put it there or get it from there. 392 */ 393 #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4))) 394 #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) 395 #define GET_PFN(pfn) (pfn & 0x0fffffffUL) 396 397 int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long, 398 unsigned long, pgprot_t); 399 400 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 401 unsigned long from, unsigned long pfn, 402 unsigned long size, pgprot_t prot) 403 { 404 unsigned long long offset, space, phys_base; 405 406 offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT; 407 space = GET_IOSPACE(pfn); 408 phys_base = offset | (space << 32ULL); 409 410 return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot); 411 } 412 #define io_remap_pfn_range io_remap_pfn_range 413 414 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 415 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ 416 ({ \ 417 int __changed = !pte_same(*(__ptep), __entry); \ 418 if (__changed) { \ 419 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ 420 flush_tlb_page(__vma, __address); \ 421 } \ 422 __changed; \ 423 }) 424 425 #endif /* !(__ASSEMBLY__) */ 426 427 #define VMALLOC_START _AC(0xfe600000,UL) 428 #define VMALLOC_END _AC(0xffc00000,UL) 429 430 /* We provide our own get_unmapped_area to cope with VA holes for userland */ 431 #define HAVE_ARCH_UNMAPPED_AREA 432 433 #endif /* !(_SPARC_PGTABLE_H) */ 434