1/* $Id: pgtable.h,v 1.1.1.1 2007/08/03 18:53:36 Exp $ */ 2#ifndef _SPARC_PGTABLE_H 3#define _SPARC_PGTABLE_H 4 5/* asm-sparc/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 <asm-generic/4level-fixup.h> 13 14#include <linux/spinlock.h> 15#include <linux/swap.h> 16#include <asm/types.h> 17#ifdef CONFIG_SUN4 18#include <asm/pgtsun4.h> 19#else 20#include <asm/pgtsun4c.h> 21#endif 22#include <asm/pgtsrmmu.h> 23#include <asm/vac-ops.h> 24#include <asm/oplib.h> 25#include <asm/btfixup.h> 26#include <asm/system.h> 27 28#ifndef __ASSEMBLY__ 29 30struct vm_area_struct; 31struct page; 32 33extern void load_mmu(void); 34extern unsigned long calc_highpages(void); 35 36BTFIXUPDEF_SIMM13(pgdir_shift) 37BTFIXUPDEF_SETHI(pgdir_size) 38BTFIXUPDEF_SETHI(pgdir_mask) 39 40BTFIXUPDEF_SIMM13(ptrs_per_pmd) 41BTFIXUPDEF_SIMM13(ptrs_per_pgd) 42BTFIXUPDEF_SIMM13(user_ptrs_per_pgd) 43 44#define pte_ERROR(e) __builtin_trap() 45#define pmd_ERROR(e) __builtin_trap() 46#define pgd_ERROR(e) __builtin_trap() 47 48BTFIXUPDEF_INT(page_none) 49BTFIXUPDEF_INT(page_shared) 50BTFIXUPDEF_INT(page_copy) 51BTFIXUPDEF_INT(page_readonly) 52BTFIXUPDEF_INT(page_kernel) 53 54#define PMD_SHIFT SUN4C_PMD_SHIFT 55#define PMD_SIZE (1UL << PMD_SHIFT) 56#define PMD_MASK (~(PMD_SIZE-1)) 57#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) 58#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift) 59#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size) 60#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask) 61#define PTRS_PER_PTE 1024 62#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd) 63#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd) 64#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd) 65#define FIRST_USER_ADDRESS 0 66#define PTE_SIZE (PTRS_PER_PTE*4) 67 68#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none)) 69#define PAGE_SHARED __pgprot(BTFIXUP_INT(page_shared)) 70#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy)) 71#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly)) 72 73extern unsigned long page_kernel; 74 75#ifdef MODULE 76#define PAGE_KERNEL page_kernel 77#else 78#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel)) 79#endif 80 81/* Top-level page directory */ 82extern pgd_t swapper_pg_dir[1024]; 83 84extern void paging_init(void); 85 86/* Page table for 0-4MB for everybody, on the Sparc this 87 * holds the same as on the i386. 88 */ 89extern pte_t pg0[1024]; 90extern pte_t pg1[1024]; 91extern pte_t pg2[1024]; 92extern pte_t pg3[1024]; 93 94extern unsigned long ptr_in_current_pgd; 95 96/* Here is a trick, since mmap.c need the initializer elements for 97 * protection_map[] to be constant at compile time, I set the following 98 * to all zeros. I set it to the real values after I link in the 99 * appropriate MMU page table routines at boot time. 100 */ 101#define __P000 __pgprot(0) 102#define __P001 __pgprot(0) 103#define __P010 __pgprot(0) 104#define __P011 __pgprot(0) 105#define __P100 __pgprot(0) 106#define __P101 __pgprot(0) 107#define __P110 __pgprot(0) 108#define __P111 __pgprot(0) 109 110#define __S000 __pgprot(0) 111#define __S001 __pgprot(0) 112#define __S010 __pgprot(0) 113#define __S011 __pgprot(0) 114#define __S100 __pgprot(0) 115#define __S101 __pgprot(0) 116#define __S110 __pgprot(0) 117#define __S111 __pgprot(0) 118 119extern int num_contexts; 120 121/* First physical page can be anywhere, the following is needed so that 122 * va-->pa and vice versa conversions work properly without performance 123 * hit for all __pa()/__va() operations. 124 */ 125extern unsigned long phys_base; 126extern unsigned long pfn_base; 127 128/* 129 * BAD_PAGETABLE is used when we need a bogus page-table, while 130 * BAD_PAGE is used for a bogus page. 131 * 132 * ZERO_PAGE is a global shared page that is always zero: used 133 * for zero-mapped memory areas etc.. 134 */ 135extern pte_t * __bad_pagetable(void); 136extern pte_t __bad_page(void); 137extern unsigned long empty_zero_page; 138 139#define BAD_PAGETABLE __bad_pagetable() 140#define BAD_PAGE __bad_page() 141#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page)) 142 143/* 144 */ 145BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t) 146BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t) 147 148#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd) 149#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd) 150 151BTFIXUPDEF_SETHI(none_mask) 152BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t) 153BTFIXUPDEF_CALL(void, pte_clear, pte_t *) 154BTFIXUPDEF_CALL(int, pte_read, pte_t) 155 156static inline int pte_none(pte_t pte) 157{ 158 return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask)); 159} 160 161#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte) 162#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte) 163#define pte_read(pte) BTFIXUP_CALL(pte_read)(pte) 164 165BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t) 166BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t) 167BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *) 168 169static inline int pmd_none(pmd_t pmd) 170{ 171 return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask)); 172} 173 174#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd) 175#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd) 176#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd) 177 178BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t) 179BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t) 180BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t) 181BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *) 182 183#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd) 184#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd) 185#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd) 186#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd) 187 188/* 189 * The following only work if pte_present() is true. 190 * Undefined behaviour if not.. 191 */ 192BTFIXUPDEF_HALF(pte_writei) 193BTFIXUPDEF_HALF(pte_dirtyi) 194BTFIXUPDEF_HALF(pte_youngi) 195 196static int pte_write(pte_t pte) __attribute_const__; 197static inline int pte_write(pte_t pte) 198{ 199 return pte_val(pte) & BTFIXUP_HALF(pte_writei); 200} 201 202static int pte_dirty(pte_t pte) __attribute_const__; 203static inline int pte_dirty(pte_t pte) 204{ 205 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi); 206} 207 208static int pte_young(pte_t pte) __attribute_const__; 209static inline int pte_young(pte_t pte) 210{ 211 return pte_val(pte) & BTFIXUP_HALF(pte_youngi); 212} 213 214/* 215 * The following only work if pte_present() is not true. 216 */ 217BTFIXUPDEF_HALF(pte_filei) 218 219static int pte_file(pte_t pte) __attribute_const__; 220static inline int pte_file(pte_t pte) 221{ 222 return pte_val(pte) & BTFIXUP_HALF(pte_filei); 223} 224 225/* 226 */ 227BTFIXUPDEF_HALF(pte_wrprotecti) 228BTFIXUPDEF_HALF(pte_mkcleani) 229BTFIXUPDEF_HALF(pte_mkoldi) 230 231static pte_t pte_wrprotect(pte_t pte) __attribute_const__; 232static inline pte_t pte_wrprotect(pte_t pte) 233{ 234 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti)); 235} 236 237static pte_t pte_mkclean(pte_t pte) __attribute_const__; 238static inline pte_t pte_mkclean(pte_t pte) 239{ 240 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani)); 241} 242 243static pte_t pte_mkold(pte_t pte) __attribute_const__; 244static inline pte_t pte_mkold(pte_t pte) 245{ 246 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi)); 247} 248 249BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t) 250BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t) 251BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t) 252 253#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte) 254#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte) 255#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte) 256 257#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) 258 259BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t) 260#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte) 261#define pte_page(pte) pfn_to_page(pte_pfn(pte)) 262 263/* 264 * Conversion functions: convert a page and protection to a page entry, 265 * and a page entry and page directory to the page they refer to. 266 */ 267BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t) 268 269BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t) 270BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int) 271BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t) 272 273#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot) 274#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot) 275#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space) 276 277#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot) 278 279BTFIXUPDEF_INT(pte_modify_mask) 280 281static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__; 282static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 283{ 284 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) | 285 pgprot_val(newprot)); 286} 287 288#define pgd_index(address) ((address) >> PGDIR_SHIFT) 289 290/* to find an entry in a page-table-directory */ 291#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 292 293/* to find an entry in a kernel page-table-directory */ 294#define pgd_offset_k(address) pgd_offset(&init_mm, address) 295 296/* Find an entry in the second-level page table.. */ 297BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long) 298#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr) 299 300/* Find an entry in the third-level page table.. */ 301BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long) 302#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr) 303 304/* 305 * This shortcut works on sun4m (and sun4d) because the nocache area is static, 306 * and sun4c is guaranteed to have no highmem anyway. 307 */ 308#define pte_offset_map(d, a) pte_offset_kernel(d,a) 309#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a) 310 311#define pte_unmap(pte) do{}while(0) 312#define pte_unmap_nested(pte) do{}while(0) 313 314/* Certain architectures need to do special things when pte's 315 * within a page table are directly modified. Thus, the following 316 * hook is made available. 317 */ 318 319BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t) 320 321#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval) 322#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 323 324struct seq_file; 325BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *) 326 327#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p) 328 329/* Fault handler stuff... */ 330#define FAULT_CODE_PROT 0x1 331#define FAULT_CODE_WRITE 0x2 332#define FAULT_CODE_USER 0x4 333 334BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t) 335 336#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte) 337 338BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long, 339 unsigned long, unsigned int) 340BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int) 341#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len) 342#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len) 343 344extern int invalid_segment; 345 346/* Encode and de-code a swap entry */ 347BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t) 348BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t) 349BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long) 350 351#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x) 352#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x) 353#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off) 354 355#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 356#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 357 358/* file-offset-in-pte helpers */ 359BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte); 360BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff); 361 362#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte) 363#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off) 364 365/* 366 * This is made a constant because mm/fremap.c required a constant. 367 * Note that layout of these bits is different between sun4c.c and srmmu.c. 368 */ 369#define PTE_FILE_MAX_BITS 24 370 371/* 372 */ 373struct ctx_list { 374 struct ctx_list *next; 375 struct ctx_list *prev; 376 unsigned int ctx_number; 377 struct mm_struct *ctx_mm; 378}; 379 380extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */ 381extern struct ctx_list ctx_free; /* Head of free list */ 382extern struct ctx_list ctx_used; /* Head of used contexts list */ 383 384#define NO_CONTEXT -1 385 386static inline void remove_from_ctx_list(struct ctx_list *entry) 387{ 388 entry->next->prev = entry->prev; 389 entry->prev->next = entry->next; 390} 391 392static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry) 393{ 394 entry->next = head; 395 (entry->prev = head->prev)->next = entry; 396 head->prev = entry; 397} 398#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry) 399#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry) 400 401static inline unsigned long 402__get_phys (unsigned long addr) 403{ 404 switch (sparc_cpu_model){ 405 case sun4: 406 case sun4c: 407 return sun4c_get_pte (addr) << PAGE_SHIFT; 408 case sun4m: 409 case sun4d: 410 return ((srmmu_get_pte (addr) & 0xffffff00) << 4); 411 default: 412 return 0; 413 } 414} 415 416static inline int 417__get_iospace (unsigned long addr) 418{ 419 switch (sparc_cpu_model){ 420 case sun4: 421 case sun4c: 422 return -1; /* Don't check iospace on sun4c */ 423 case sun4m: 424 case sun4d: 425 return (srmmu_get_pte (addr) >> 28); 426 default: 427 return -1; 428 } 429} 430 431extern unsigned long *sparc_valid_addr_bitmap; 432 433/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 434#define kern_addr_valid(addr) \ 435 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) 436 437extern int io_remap_pfn_range(struct vm_area_struct *vma, 438 unsigned long from, unsigned long pfn, 439 unsigned long size, pgprot_t prot); 440 441/* 442 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in 443 * its high 4 bits. These macros/functions put it there or get it from there. 444 */ 445#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4))) 446#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) 447#define GET_PFN(pfn) (pfn & 0x0fffffffUL) 448 449#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 450#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ 451({ \ 452 int __changed = !pte_same(*(__ptep), __entry); \ 453 if (__changed) { \ 454 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ 455 flush_tlb_page(__vma, __address); \ 456 } \ 457 (sparc_cpu_model == sun4c) || __changed; \ 458}) 459 460#include <asm-generic/pgtable.h> 461 462#endif /* !(__ASSEMBLY__) */ 463 464/* We provide our own get_unmapped_area to cope with VA holes for userland */ 465#define HAVE_ARCH_UNMAPPED_AREA 466 467/* 468 * No page table caches to initialise 469 */ 470#define pgtable_cache_init() do { } while (0) 471 472#endif /* !(_SPARC_PGTABLE_H) */ 473