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 #ifndef __ASSEMBLY__ 15 #include <asm-generic/pgtable-nopud.h> 16 17 #include <linux/spinlock.h> 18 #include <linux/mm_types.h> 19 #include <asm/types.h> 20 #include <asm/pgtsrmmu.h> 21 #include <asm/vaddrs.h> 22 #include <asm/oplib.h> 23 #include <asm/cpu_type.h> 24 25 26 struct vm_area_struct; 27 struct page; 28 29 void load_mmu(void); 30 unsigned long calc_highpages(void); 31 unsigned long __init bootmem_init(unsigned long *pages_avail); 32 33 #define pte_ERROR(e) __builtin_trap() 34 #define pmd_ERROR(e) __builtin_trap() 35 #define pgd_ERROR(e) __builtin_trap() 36 37 #define PMD_SHIFT 22 38 #define PMD_SIZE (1UL << PMD_SHIFT) 39 #define PMD_MASK (~(PMD_SIZE-1)) 40 #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) 41 #define PGDIR_SHIFT SRMMU_PGDIR_SHIFT 42 #define PGDIR_SIZE SRMMU_PGDIR_SIZE 43 #define PGDIR_MASK SRMMU_PGDIR_MASK 44 #define PTRS_PER_PTE 1024 45 #define PTRS_PER_PMD SRMMU_PTRS_PER_PMD 46 #define PTRS_PER_PGD SRMMU_PTRS_PER_PGD 47 #define USER_PTRS_PER_PGD PAGE_OFFSET / SRMMU_PGDIR_SIZE 48 #define FIRST_USER_ADDRESS 0UL 49 #define PTE_SIZE (PTRS_PER_PTE*4) 50 51 #define PAGE_NONE SRMMU_PAGE_NONE 52 #define PAGE_SHARED SRMMU_PAGE_SHARED 53 #define PAGE_COPY SRMMU_PAGE_COPY 54 #define PAGE_READONLY SRMMU_PAGE_RDONLY 55 #define PAGE_KERNEL SRMMU_PAGE_KERNEL 56 57 /* Top-level page directory - dummy used by init-mm. 58 * srmmu.c will assign the real one (which is dynamically sized) */ 59 #define swapper_pg_dir NULL 60 61 void paging_init(void); 62 63 extern unsigned long ptr_in_current_pgd; 64 65 /* xwr */ 66 #define __P000 PAGE_NONE 67 #define __P001 PAGE_READONLY 68 #define __P010 PAGE_COPY 69 #define __P011 PAGE_COPY 70 #define __P100 PAGE_READONLY 71 #define __P101 PAGE_READONLY 72 #define __P110 PAGE_COPY 73 #define __P111 PAGE_COPY 74 75 #define __S000 PAGE_NONE 76 #define __S001 PAGE_READONLY 77 #define __S010 PAGE_SHARED 78 #define __S011 PAGE_SHARED 79 #define __S100 PAGE_READONLY 80 #define __S101 PAGE_READONLY 81 #define __S110 PAGE_SHARED 82 #define __S111 PAGE_SHARED 83 84 /* First physical page can be anywhere, the following is needed so that 85 * va-->pa and vice versa conversions work properly without performance 86 * hit for all __pa()/__va() operations. 87 */ 88 extern unsigned long phys_base; 89 extern unsigned long pfn_base; 90 91 /* 92 * ZERO_PAGE is a global shared page that is always zero: used 93 * for zero-mapped memory areas etc.. 94 */ 95 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 96 97 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 98 99 /* 100 * In general all page table modifications should use the V8 atomic 101 * swap instruction. This insures the mmu and the cpu are in sync 102 * with respect to ref/mod bits in the page tables. 103 */ 104 static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value) 105 { 106 __asm__ __volatile__("swap [%2], %0" : 107 "=&r" (value) : "0" (value), "r" (addr) : "memory"); 108 return value; 109 } 110 111 /* Certain architectures need to do special things when pte's 112 * within a page table are directly modified. Thus, the following 113 * hook is made available. 114 */ 115 116 static inline void set_pte(pte_t *ptep, pte_t pteval) 117 { 118 srmmu_swap((unsigned long *)ptep, pte_val(pteval)); 119 } 120 121 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 122 123 static inline int srmmu_device_memory(unsigned long x) 124 { 125 return ((x & 0xF0000000) != 0); 126 } 127 128 static inline struct page *pmd_page(pmd_t pmd) 129 { 130 if (srmmu_device_memory(pmd_val(pmd))) 131 BUG(); 132 return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4)); 133 } 134 135 static inline unsigned long pud_page_vaddr(pud_t pud) 136 { 137 if (srmmu_device_memory(pud_val(pud))) { 138 return ~0; 139 } else { 140 unsigned long v = pud_val(pud) & SRMMU_PTD_PMASK; 141 return (unsigned long)__nocache_va(v << 4); 142 } 143 } 144 145 static inline int pte_present(pte_t pte) 146 { 147 return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE); 148 } 149 150 static inline int pte_none(pte_t pte) 151 { 152 return !pte_val(pte); 153 } 154 155 static inline void __pte_clear(pte_t *ptep) 156 { 157 set_pte(ptep, __pte(0)); 158 } 159 160 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 161 { 162 __pte_clear(ptep); 163 } 164 165 static inline int pmd_bad(pmd_t pmd) 166 { 167 return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; 168 } 169 170 static inline int pmd_present(pmd_t pmd) 171 { 172 return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); 173 } 174 175 static inline int pmd_none(pmd_t pmd) 176 { 177 return !pmd_val(pmd); 178 } 179 180 static inline void pmd_clear(pmd_t *pmdp) 181 { 182 int i; 183 for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) 184 set_pte((pte_t *)&pmdp->pmdv[i], __pte(0)); 185 } 186 187 static inline int pud_none(pud_t pud) 188 { 189 return !(pud_val(pud) & 0xFFFFFFF); 190 } 191 192 static inline int pud_bad(pud_t pud) 193 { 194 return (pud_val(pud) & SRMMU_ET_MASK) != SRMMU_ET_PTD; 195 } 196 197 static inline int pud_present(pud_t pud) 198 { 199 return ((pud_val(pud) & SRMMU_ET_MASK) == SRMMU_ET_PTD); 200 } 201 202 static inline void pud_clear(pud_t *pudp) 203 { 204 set_pte((pte_t *)pudp, __pte(0)); 205 } 206 207 /* 208 * The following only work if pte_present() is true. 209 * Undefined behaviour if not.. 210 */ 211 static inline int pte_write(pte_t pte) 212 { 213 return pte_val(pte) & SRMMU_WRITE; 214 } 215 216 static inline int pte_dirty(pte_t pte) 217 { 218 return pte_val(pte) & SRMMU_DIRTY; 219 } 220 221 static inline int pte_young(pte_t pte) 222 { 223 return pte_val(pte) & SRMMU_REF; 224 } 225 226 static inline int pte_special(pte_t pte) 227 { 228 return 0; 229 } 230 231 static inline pte_t pte_wrprotect(pte_t pte) 232 { 233 return __pte(pte_val(pte) & ~SRMMU_WRITE); 234 } 235 236 static inline pte_t pte_mkclean(pte_t pte) 237 { 238 return __pte(pte_val(pte) & ~SRMMU_DIRTY); 239 } 240 241 static inline pte_t pte_mkold(pte_t pte) 242 { 243 return __pte(pte_val(pte) & ~SRMMU_REF); 244 } 245 246 static inline pte_t pte_mkwrite(pte_t pte) 247 { 248 return __pte(pte_val(pte) | SRMMU_WRITE); 249 } 250 251 static inline pte_t pte_mkdirty(pte_t pte) 252 { 253 return __pte(pte_val(pte) | SRMMU_DIRTY); 254 } 255 256 static inline pte_t pte_mkyoung(pte_t pte) 257 { 258 return __pte(pte_val(pte) | SRMMU_REF); 259 } 260 261 #define pte_mkspecial(pte) (pte) 262 263 #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) 264 265 static inline unsigned long pte_pfn(pte_t pte) 266 { 267 if (srmmu_device_memory(pte_val(pte))) { 268 /* Just return something that will cause 269 * pfn_valid() to return false. This makes 270 * copy_one_pte() to just directly copy to 271 * PTE over. 272 */ 273 return ~0UL; 274 } 275 return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4); 276 } 277 278 #define pte_page(pte) pfn_to_page(pte_pfn(pte)) 279 280 /* 281 * Conversion functions: convert a page and protection to a page entry, 282 * and a page entry and page directory to the page they refer to. 283 */ 284 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot) 285 { 286 return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot)); 287 } 288 289 static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot) 290 { 291 return __pte(((page) >> 4) | pgprot_val(pgprot)); 292 } 293 294 static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space) 295 { 296 return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot)); 297 } 298 299 #define pgprot_noncached pgprot_noncached 300 static inline pgprot_t pgprot_noncached(pgprot_t prot) 301 { 302 pgprot_val(prot) &= ~pgprot_val(__pgprot(SRMMU_CACHE)); 303 return prot; 304 } 305 306 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__; 307 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 308 { 309 return __pte((pte_val(pte) & SRMMU_CHG_MASK) | 310 pgprot_val(newprot)); 311 } 312 313 #define pgd_index(address) ((address) >> PGDIR_SHIFT) 314 315 /* to find an entry in a page-table-directory */ 316 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 317 318 /* to find an entry in a kernel page-table-directory */ 319 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 320 321 /* Find an entry in the second-level page table.. */ 322 static inline pmd_t *pmd_offset(pud_t * dir, unsigned long address) 323 { 324 return (pmd_t *) pud_page_vaddr(*dir) + 325 ((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); 326 } 327 328 /* Find an entry in the third-level page table.. */ 329 pte_t *pte_offset_kernel(pmd_t * dir, unsigned long address); 330 331 /* 332 * This shortcut works on sun4m (and sun4d) because the nocache area is static. 333 */ 334 #define pte_offset_map(d, a) pte_offset_kernel(d,a) 335 #define pte_unmap(pte) do{}while(0) 336 337 struct seq_file; 338 void mmu_info(struct seq_file *m); 339 340 /* Fault handler stuff... */ 341 #define FAULT_CODE_PROT 0x1 342 #define FAULT_CODE_WRITE 0x2 343 #define FAULT_CODE_USER 0x4 344 345 #define update_mmu_cache(vma, address, ptep) do { } while (0) 346 347 void srmmu_mapiorange(unsigned int bus, unsigned long xpa, 348 unsigned long xva, unsigned int len); 349 void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len); 350 351 /* Encode and de-code a swap entry */ 352 static inline unsigned long __swp_type(swp_entry_t entry) 353 { 354 return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK; 355 } 356 357 static inline unsigned long __swp_offset(swp_entry_t entry) 358 { 359 return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK; 360 } 361 362 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) 363 { 364 return (swp_entry_t) { 365 (type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT 366 | (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT }; 367 } 368 369 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 370 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 371 372 static inline unsigned long 373 __get_phys (unsigned long addr) 374 { 375 switch (sparc_cpu_model){ 376 case sun4m: 377 case sun4d: 378 return ((srmmu_get_pte (addr) & 0xffffff00) << 4); 379 default: 380 return 0; 381 } 382 } 383 384 static inline int 385 __get_iospace (unsigned long addr) 386 { 387 switch (sparc_cpu_model){ 388 case sun4m: 389 case sun4d: 390 return (srmmu_get_pte (addr) >> 28); 391 default: 392 return -1; 393 } 394 } 395 396 extern unsigned long *sparc_valid_addr_bitmap; 397 398 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 399 #define kern_addr_valid(addr) \ 400 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) 401 402 /* 403 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in 404 * its high 4 bits. These macros/functions put it there or get it from there. 405 */ 406 #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4))) 407 #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) 408 #define GET_PFN(pfn) (pfn & 0x0fffffffUL) 409 410 int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long, 411 unsigned long, pgprot_t); 412 413 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 414 unsigned long from, unsigned long pfn, 415 unsigned long size, pgprot_t prot) 416 { 417 unsigned long long offset, space, phys_base; 418 419 offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT; 420 space = GET_IOSPACE(pfn); 421 phys_base = offset | (space << 32ULL); 422 423 return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot); 424 } 425 #define io_remap_pfn_range io_remap_pfn_range 426 427 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 428 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ 429 ({ \ 430 int __changed = !pte_same(*(__ptep), __entry); \ 431 if (__changed) { \ 432 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ 433 flush_tlb_page(__vma, __address); \ 434 } \ 435 __changed; \ 436 }) 437 438 #include <asm-generic/pgtable.h> 439 440 #endif /* !(__ASSEMBLY__) */ 441 442 #define VMALLOC_START _AC(0xfe600000,UL) 443 #define VMALLOC_END _AC(0xffc00000,UL) 444 445 /* We provide our own get_unmapped_area to cope with VA holes for userland */ 446 #define HAVE_ARCH_UNMAPPED_AREA 447 448 #endif /* !(_SPARC_PGTABLE_H) */ 449