1#ifndef _SPARC_PGTABLE_H 2#define _SPARC_PGTABLE_H 3 4/* asm/pgtable.h: Defines and functions used to work 5 * with Sparc page tables. 6 * 7 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 8 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 9 */ 10 11#ifndef __ASSEMBLY__ 12#include <asm-generic/4level-fixup.h> 13 14#include <linux/spinlock.h> 15#include <linux/swap.h> 16#include <asm/types.h> 17#include <asm/pgtsun4c.h> 18#include <asm/pgtsrmmu.h> 19#include <asm/vac-ops.h> 20#include <asm/oplib.h> 21#include <asm/btfixup.h> 22#include <asm/system.h> 23 24 25struct vm_area_struct; 26struct page; 27 28extern void load_mmu(void); 29extern unsigned long calc_highpages(void); 30 31BTFIXUPDEF_SIMM13(pgdir_shift) 32BTFIXUPDEF_SETHI(pgdir_size) 33BTFIXUPDEF_SETHI(pgdir_mask) 34 35BTFIXUPDEF_SIMM13(ptrs_per_pmd) 36BTFIXUPDEF_SIMM13(ptrs_per_pgd) 37BTFIXUPDEF_SIMM13(user_ptrs_per_pgd) 38 39#define pte_ERROR(e) __builtin_trap() 40#define pmd_ERROR(e) __builtin_trap() 41#define pgd_ERROR(e) __builtin_trap() 42 43BTFIXUPDEF_INT(page_none) 44BTFIXUPDEF_INT(page_copy) 45BTFIXUPDEF_INT(page_readonly) 46BTFIXUPDEF_INT(page_kernel) 47 48#define PMD_SHIFT SUN4C_PMD_SHIFT 49#define PMD_SIZE (1UL << PMD_SHIFT) 50#define PMD_MASK (~(PMD_SIZE-1)) 51#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) 52#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift) 53#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size) 54#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask) 55#define PTRS_PER_PTE 1024 56#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd) 57#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd) 58#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd) 59#define FIRST_USER_ADDRESS 0 60#define PTE_SIZE (PTRS_PER_PTE*4) 61 62#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none)) 63extern pgprot_t PAGE_SHARED; 64#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy)) 65#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly)) 66 67extern unsigned long page_kernel; 68 69#ifdef MODULE 70#define PAGE_KERNEL page_kernel 71#else 72#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel)) 73#endif 74 75/* Top-level page directory */ 76extern pgd_t swapper_pg_dir[1024]; 77 78extern void paging_init(void); 79 80/* Page table for 0-4MB for everybody, on the Sparc this 81 * holds the same as on the i386. 82 */ 83extern pte_t pg0[1024]; 84extern pte_t pg1[1024]; 85extern pte_t pg2[1024]; 86extern pte_t pg3[1024]; 87 88extern unsigned long ptr_in_current_pgd; 89 90/* Here is a trick, since mmap.c need the initializer elements for 91 * protection_map[] to be constant at compile time, I set the following 92 * to all zeros. I set it to the real values after I link in the 93 * appropriate MMU page table routines at boot time. 94 */ 95#define __P000 __pgprot(0) 96#define __P001 __pgprot(0) 97#define __P010 __pgprot(0) 98#define __P011 __pgprot(0) 99#define __P100 __pgprot(0) 100#define __P101 __pgprot(0) 101#define __P110 __pgprot(0) 102#define __P111 __pgprot(0) 103 104#define __S000 __pgprot(0) 105#define __S001 __pgprot(0) 106#define __S010 __pgprot(0) 107#define __S011 __pgprot(0) 108#define __S100 __pgprot(0) 109#define __S101 __pgprot(0) 110#define __S110 __pgprot(0) 111#define __S111 __pgprot(0) 112 113extern int num_contexts; 114 115/* First physical page can be anywhere, the following is needed so that 116 * va-->pa and vice versa conversions work properly without performance 117 * hit for all __pa()/__va() operations. 118 */ 119extern unsigned long phys_base; 120extern unsigned long pfn_base; 121 122/* 123 * BAD_PAGETABLE is used when we need a bogus page-table, while 124 * BAD_PAGE is used for a bogus page. 125 * 126 * ZERO_PAGE is a global shared page that is always zero: used 127 * for zero-mapped memory areas etc.. 128 */ 129extern pte_t * __bad_pagetable(void); 130extern pte_t __bad_page(void); 131extern unsigned long empty_zero_page; 132 133#define BAD_PAGETABLE __bad_pagetable() 134#define BAD_PAGE __bad_page() 135#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page)) 136 137/* 138 */ 139BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t) 140BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t) 141 142#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd) 143#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd) 144 145BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t) 146BTFIXUPDEF_CALL(void, pte_clear, pte_t *) 147 148static inline int pte_none(pte_t pte) 149{ 150 return !pte_val(pte); 151} 152 153#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte) 154#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte) 155 156BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t) 157BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t) 158BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *) 159 160static inline int pmd_none(pmd_t pmd) 161{ 162 return !pmd_val(pmd); 163} 164 165#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd) 166#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd) 167#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd) 168 169BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t) 170BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t) 171BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t) 172BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *) 173 174#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd) 175#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd) 176#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd) 177#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd) 178 179/* 180 * The following only work if pte_present() is true. 181 * Undefined behaviour if not.. 182 */ 183BTFIXUPDEF_HALF(pte_writei) 184BTFIXUPDEF_HALF(pte_dirtyi) 185BTFIXUPDEF_HALF(pte_youngi) 186 187static int pte_write(pte_t pte) __attribute_const__; 188static inline int pte_write(pte_t pte) 189{ 190 return pte_val(pte) & BTFIXUP_HALF(pte_writei); 191} 192 193static int pte_dirty(pte_t pte) __attribute_const__; 194static inline int pte_dirty(pte_t pte) 195{ 196 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi); 197} 198 199static int pte_young(pte_t pte) __attribute_const__; 200static inline int pte_young(pte_t pte) 201{ 202 return pte_val(pte) & BTFIXUP_HALF(pte_youngi); 203} 204 205/* 206 * The following only work if pte_present() is not true. 207 */ 208BTFIXUPDEF_HALF(pte_filei) 209 210static int pte_file(pte_t pte) __attribute_const__; 211static inline int pte_file(pte_t pte) 212{ 213 return pte_val(pte) & BTFIXUP_HALF(pte_filei); 214} 215 216static inline int pte_special(pte_t pte) 217{ 218 return 0; 219} 220 221/* 222 */ 223BTFIXUPDEF_HALF(pte_wrprotecti) 224BTFIXUPDEF_HALF(pte_mkcleani) 225BTFIXUPDEF_HALF(pte_mkoldi) 226 227static pte_t pte_wrprotect(pte_t pte) __attribute_const__; 228static inline pte_t pte_wrprotect(pte_t pte) 229{ 230 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti)); 231} 232 233static pte_t pte_mkclean(pte_t pte) __attribute_const__; 234static inline pte_t pte_mkclean(pte_t pte) 235{ 236 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani)); 237} 238 239static pte_t pte_mkold(pte_t pte) __attribute_const__; 240static inline pte_t pte_mkold(pte_t pte) 241{ 242 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi)); 243} 244 245BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t) 246BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t) 247BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t) 248 249#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte) 250#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte) 251#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte) 252 253#define pte_mkspecial(pte) (pte) 254 255#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) 256 257BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t) 258#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte) 259#define pte_page(pte) pfn_to_page(pte_pfn(pte)) 260 261/* 262 * Conversion functions: convert a page and protection to a page entry, 263 * and a page entry and page directory to the page they refer to. 264 */ 265BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t) 266 267BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t) 268BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int) 269BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t) 270 271#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot) 272#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot) 273#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space) 274 275#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot) 276 277BTFIXUPDEF_INT(pte_modify_mask) 278 279static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__; 280static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 281{ 282 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) | 283 pgprot_val(newprot)); 284} 285 286#define pgd_index(address) ((address) >> PGDIR_SHIFT) 287 288/* to find an entry in a page-table-directory */ 289#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 290 291/* to find an entry in a kernel page-table-directory */ 292#define pgd_offset_k(address) pgd_offset(&init_mm, address) 293 294/* Find an entry in the second-level page table.. */ 295BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long) 296#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr) 297 298/* Find an entry in the third-level page table.. */ 299BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long) 300#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr) 301 302/* 303 * This shortcut works on sun4m (and sun4d) because the nocache area is static, 304 * and sun4c is guaranteed to have no highmem anyway. 305 */ 306#define pte_offset_map(d, a) pte_offset_kernel(d,a) 307#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a) 308 309#define pte_unmap(pte) do{}while(0) 310#define pte_unmap_nested(pte) do{}while(0) 311 312/* Certain architectures need to do special things when pte's 313 * within a page table are directly modified. Thus, the following 314 * hook is made available. 315 */ 316 317BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t) 318 319#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval) 320#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 321 322struct seq_file; 323BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *) 324 325#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p) 326 327/* Fault handler stuff... */ 328#define FAULT_CODE_PROT 0x1 329#define FAULT_CODE_WRITE 0x2 330#define FAULT_CODE_USER 0x4 331 332BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *) 333 334#define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep) 335 336BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long, 337 unsigned long, unsigned int) 338BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int) 339#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len) 340#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len) 341 342extern int invalid_segment; 343 344/* Encode and de-code a swap entry */ 345BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t) 346BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t) 347BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long) 348 349#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x) 350#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x) 351#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off) 352 353#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 354#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 355 356/* file-offset-in-pte helpers */ 357BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte); 358BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff); 359 360#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte) 361#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off) 362 363/* 364 * This is made a constant because mm/fremap.c required a constant. 365 * Note that layout of these bits is different between sun4c.c and srmmu.c. 366 */ 367#define PTE_FILE_MAX_BITS 24 368 369/* 370 */ 371struct ctx_list { 372 struct ctx_list *next; 373 struct ctx_list *prev; 374 unsigned int ctx_number; 375 struct mm_struct *ctx_mm; 376}; 377 378extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */ 379extern struct ctx_list ctx_free; /* Head of free list */ 380extern struct ctx_list ctx_used; /* Head of used contexts list */ 381 382#define NO_CONTEXT -1 383 384static inline void remove_from_ctx_list(struct ctx_list *entry) 385{ 386 entry->next->prev = entry->prev; 387 entry->prev->next = entry->next; 388} 389 390static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry) 391{ 392 entry->next = head; 393 (entry->prev = head->prev)->next = entry; 394 head->prev = entry; 395} 396#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry) 397#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry) 398 399static inline unsigned long 400__get_phys (unsigned long addr) 401{ 402 switch (sparc_cpu_model){ 403 case sun4: 404 case sun4c: 405 return sun4c_get_pte (addr) << PAGE_SHIFT; 406 case sun4m: 407 case sun4d: 408 return ((srmmu_get_pte (addr) & 0xffffff00) << 4); 409 default: 410 return 0; 411 } 412} 413 414static inline int 415__get_iospace (unsigned long addr) 416{ 417 switch (sparc_cpu_model){ 418 case sun4: 419 case sun4c: 420 return -1; /* Don't check iospace on sun4c */ 421 case sun4m: 422 case sun4d: 423 return (srmmu_get_pte (addr) >> 28); 424 default: 425 return -1; 426 } 427} 428 429extern unsigned long *sparc_valid_addr_bitmap; 430 431/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 432#define kern_addr_valid(addr) \ 433 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) 434 435extern int io_remap_pfn_range(struct vm_area_struct *vma, 436 unsigned long from, unsigned long pfn, 437 unsigned long size, pgprot_t prot); 438 439/* 440 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in 441 * its high 4 bits. These macros/functions put it there or get it from there. 442 */ 443#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4))) 444#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) 445#define GET_PFN(pfn) (pfn & 0x0fffffffUL) 446 447#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 448#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ 449({ \ 450 int __changed = !pte_same(*(__ptep), __entry); \ 451 if (__changed) { \ 452 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ 453 flush_tlb_page(__vma, __address); \ 454 } \ 455 (sparc_cpu_model == sun4c) || __changed; \ 456}) 457 458#include <asm-generic/pgtable.h> 459 460#endif /* !(__ASSEMBLY__) */ 461 462#define VMALLOC_START 0xfe600000 463#define VMALLOC_END 0xffc00000 464 465 466/* We provide our own get_unmapped_area to cope with VA holes for userland */ 467#define HAVE_ARCH_UNMAPPED_AREA 468 469/* 470 * No page table caches to initialise 471 */ 472#define pgtable_cache_init() do { } while (0) 473 474#endif /* !(_SPARC_PGTABLE_H) */ 475