1 #ifndef _ASM_X86_PARAVIRT_H 2 #define _ASM_X86_PARAVIRT_H 3 /* Various instructions on x86 need to be replaced for 4 * para-virtualization: those hooks are defined here. */ 5 6 #ifdef CONFIG_PARAVIRT 7 #include <asm/pgtable_types.h> 8 #include <asm/asm.h> 9 10 #include <asm/paravirt_types.h> 11 12 #ifndef __ASSEMBLY__ 13 #include <linux/bug.h> 14 #include <linux/types.h> 15 #include <linux/cpumask.h> 16 17 static inline int paravirt_enabled(void) 18 { 19 return pv_info.paravirt_enabled; 20 } 21 22 static inline void load_sp0(struct tss_struct *tss, 23 struct thread_struct *thread) 24 { 25 PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread); 26 } 27 28 /* The paravirtualized CPUID instruction. */ 29 static inline void __cpuid(unsigned int *eax, unsigned int *ebx, 30 unsigned int *ecx, unsigned int *edx) 31 { 32 PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx); 33 } 34 35 /* 36 * These special macros can be used to get or set a debugging register 37 */ 38 static inline unsigned long paravirt_get_debugreg(int reg) 39 { 40 return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg); 41 } 42 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg) 43 static inline void set_debugreg(unsigned long val, int reg) 44 { 45 PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val); 46 } 47 48 static inline void clts(void) 49 { 50 PVOP_VCALL0(pv_cpu_ops.clts); 51 } 52 53 static inline unsigned long read_cr0(void) 54 { 55 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0); 56 } 57 58 static inline void write_cr0(unsigned long x) 59 { 60 PVOP_VCALL1(pv_cpu_ops.write_cr0, x); 61 } 62 63 static inline unsigned long read_cr2(void) 64 { 65 return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2); 66 } 67 68 static inline void write_cr2(unsigned long x) 69 { 70 PVOP_VCALL1(pv_mmu_ops.write_cr2, x); 71 } 72 73 static inline unsigned long read_cr3(void) 74 { 75 return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3); 76 } 77 78 static inline void write_cr3(unsigned long x) 79 { 80 PVOP_VCALL1(pv_mmu_ops.write_cr3, x); 81 } 82 83 static inline unsigned long read_cr4(void) 84 { 85 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4); 86 } 87 static inline unsigned long read_cr4_safe(void) 88 { 89 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe); 90 } 91 92 static inline void write_cr4(unsigned long x) 93 { 94 PVOP_VCALL1(pv_cpu_ops.write_cr4, x); 95 } 96 97 #ifdef CONFIG_X86_64 98 static inline unsigned long read_cr8(void) 99 { 100 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8); 101 } 102 103 static inline void write_cr8(unsigned long x) 104 { 105 PVOP_VCALL1(pv_cpu_ops.write_cr8, x); 106 } 107 #endif 108 109 static inline void arch_safe_halt(void) 110 { 111 PVOP_VCALL0(pv_irq_ops.safe_halt); 112 } 113 114 static inline void halt(void) 115 { 116 PVOP_VCALL0(pv_irq_ops.halt); 117 } 118 119 static inline void wbinvd(void) 120 { 121 PVOP_VCALL0(pv_cpu_ops.wbinvd); 122 } 123 124 #define get_kernel_rpl() (pv_info.kernel_rpl) 125 126 static inline u64 paravirt_read_msr(unsigned msr, int *err) 127 { 128 return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err); 129 } 130 131 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high) 132 { 133 return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high); 134 } 135 136 /* These should all do BUG_ON(_err), but our headers are too tangled. */ 137 #define rdmsr(msr, val1, val2) \ 138 do { \ 139 int _err; \ 140 u64 _l = paravirt_read_msr(msr, &_err); \ 141 val1 = (u32)_l; \ 142 val2 = _l >> 32; \ 143 } while (0) 144 145 #define wrmsr(msr, val1, val2) \ 146 do { \ 147 paravirt_write_msr(msr, val1, val2); \ 148 } while (0) 149 150 #define rdmsrl(msr, val) \ 151 do { \ 152 int _err; \ 153 val = paravirt_read_msr(msr, &_err); \ 154 } while (0) 155 156 #define wrmsrl(msr, val) wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32) 157 #define wrmsr_safe(msr, a, b) paravirt_write_msr(msr, a, b) 158 159 /* rdmsr with exception handling */ 160 #define rdmsr_safe(msr, a, b) \ 161 ({ \ 162 int _err; \ 163 u64 _l = paravirt_read_msr(msr, &_err); \ 164 (*a) = (u32)_l; \ 165 (*b) = _l >> 32; \ 166 _err; \ 167 }) 168 169 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p) 170 { 171 int err; 172 173 *p = paravirt_read_msr(msr, &err); 174 return err; 175 } 176 177 static inline u64 paravirt_read_tsc(void) 178 { 179 return PVOP_CALL0(u64, pv_cpu_ops.read_tsc); 180 } 181 182 #define rdtscl(low) \ 183 do { \ 184 u64 _l = paravirt_read_tsc(); \ 185 low = (int)_l; \ 186 } while (0) 187 188 #define rdtscll(val) (val = paravirt_read_tsc()) 189 190 static inline unsigned long long paravirt_sched_clock(void) 191 { 192 return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock); 193 } 194 195 struct static_key; 196 extern struct static_key paravirt_steal_enabled; 197 extern struct static_key paravirt_steal_rq_enabled; 198 199 static inline u64 paravirt_steal_clock(int cpu) 200 { 201 return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu); 202 } 203 204 static inline unsigned long long paravirt_read_pmc(int counter) 205 { 206 return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter); 207 } 208 209 #define rdpmc(counter, low, high) \ 210 do { \ 211 u64 _l = paravirt_read_pmc(counter); \ 212 low = (u32)_l; \ 213 high = _l >> 32; \ 214 } while (0) 215 216 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter)) 217 218 static inline unsigned long long paravirt_rdtscp(unsigned int *aux) 219 { 220 return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux); 221 } 222 223 #define rdtscp(low, high, aux) \ 224 do { \ 225 int __aux; \ 226 unsigned long __val = paravirt_rdtscp(&__aux); \ 227 (low) = (u32)__val; \ 228 (high) = (u32)(__val >> 32); \ 229 (aux) = __aux; \ 230 } while (0) 231 232 #define rdtscpll(val, aux) \ 233 do { \ 234 unsigned long __aux; \ 235 val = paravirt_rdtscp(&__aux); \ 236 (aux) = __aux; \ 237 } while (0) 238 239 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries) 240 { 241 PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries); 242 } 243 244 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries) 245 { 246 PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries); 247 } 248 249 static inline void load_TR_desc(void) 250 { 251 PVOP_VCALL0(pv_cpu_ops.load_tr_desc); 252 } 253 static inline void load_gdt(const struct desc_ptr *dtr) 254 { 255 PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr); 256 } 257 static inline void load_idt(const struct desc_ptr *dtr) 258 { 259 PVOP_VCALL1(pv_cpu_ops.load_idt, dtr); 260 } 261 static inline void set_ldt(const void *addr, unsigned entries) 262 { 263 PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries); 264 } 265 static inline void store_idt(struct desc_ptr *dtr) 266 { 267 PVOP_VCALL1(pv_cpu_ops.store_idt, dtr); 268 } 269 static inline unsigned long paravirt_store_tr(void) 270 { 271 return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr); 272 } 273 #define store_tr(tr) ((tr) = paravirt_store_tr()) 274 static inline void load_TLS(struct thread_struct *t, unsigned cpu) 275 { 276 PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu); 277 } 278 279 #ifdef CONFIG_X86_64 280 static inline void load_gs_index(unsigned int gs) 281 { 282 PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs); 283 } 284 #endif 285 286 static inline void write_ldt_entry(struct desc_struct *dt, int entry, 287 const void *desc) 288 { 289 PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc); 290 } 291 292 static inline void write_gdt_entry(struct desc_struct *dt, int entry, 293 void *desc, int type) 294 { 295 PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type); 296 } 297 298 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g) 299 { 300 PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g); 301 } 302 static inline void set_iopl_mask(unsigned mask) 303 { 304 PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask); 305 } 306 307 /* The paravirtualized I/O functions */ 308 static inline void slow_down_io(void) 309 { 310 pv_cpu_ops.io_delay(); 311 #ifdef REALLY_SLOW_IO 312 pv_cpu_ops.io_delay(); 313 pv_cpu_ops.io_delay(); 314 pv_cpu_ops.io_delay(); 315 #endif 316 } 317 318 #ifdef CONFIG_SMP 319 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip, 320 unsigned long start_esp) 321 { 322 PVOP_VCALL3(pv_apic_ops.startup_ipi_hook, 323 phys_apicid, start_eip, start_esp); 324 } 325 #endif 326 327 static inline void paravirt_activate_mm(struct mm_struct *prev, 328 struct mm_struct *next) 329 { 330 PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next); 331 } 332 333 static inline void arch_dup_mmap(struct mm_struct *oldmm, 334 struct mm_struct *mm) 335 { 336 PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm); 337 } 338 339 static inline void arch_exit_mmap(struct mm_struct *mm) 340 { 341 PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm); 342 } 343 344 static inline void __flush_tlb(void) 345 { 346 PVOP_VCALL0(pv_mmu_ops.flush_tlb_user); 347 } 348 static inline void __flush_tlb_global(void) 349 { 350 PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel); 351 } 352 static inline void __flush_tlb_single(unsigned long addr) 353 { 354 PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr); 355 } 356 357 static inline void flush_tlb_others(const struct cpumask *cpumask, 358 struct mm_struct *mm, 359 unsigned long start, 360 unsigned long end) 361 { 362 PVOP_VCALL4(pv_mmu_ops.flush_tlb_others, cpumask, mm, start, end); 363 } 364 365 static inline int paravirt_pgd_alloc(struct mm_struct *mm) 366 { 367 return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm); 368 } 369 370 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) 371 { 372 PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd); 373 } 374 375 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) 376 { 377 PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn); 378 } 379 static inline void paravirt_release_pte(unsigned long pfn) 380 { 381 PVOP_VCALL1(pv_mmu_ops.release_pte, pfn); 382 } 383 384 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) 385 { 386 PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn); 387 } 388 389 static inline void paravirt_release_pmd(unsigned long pfn) 390 { 391 PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn); 392 } 393 394 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) 395 { 396 PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn); 397 } 398 static inline void paravirt_release_pud(unsigned long pfn) 399 { 400 PVOP_VCALL1(pv_mmu_ops.release_pud, pfn); 401 } 402 403 static inline void pte_update(struct mm_struct *mm, unsigned long addr, 404 pte_t *ptep) 405 { 406 PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep); 407 } 408 static inline void pmd_update(struct mm_struct *mm, unsigned long addr, 409 pmd_t *pmdp) 410 { 411 PVOP_VCALL3(pv_mmu_ops.pmd_update, mm, addr, pmdp); 412 } 413 414 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr, 415 pte_t *ptep) 416 { 417 PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep); 418 } 419 420 static inline void pmd_update_defer(struct mm_struct *mm, unsigned long addr, 421 pmd_t *pmdp) 422 { 423 PVOP_VCALL3(pv_mmu_ops.pmd_update_defer, mm, addr, pmdp); 424 } 425 426 static inline pte_t __pte(pteval_t val) 427 { 428 pteval_t ret; 429 430 if (sizeof(pteval_t) > sizeof(long)) 431 ret = PVOP_CALLEE2(pteval_t, 432 pv_mmu_ops.make_pte, 433 val, (u64)val >> 32); 434 else 435 ret = PVOP_CALLEE1(pteval_t, 436 pv_mmu_ops.make_pte, 437 val); 438 439 return (pte_t) { .pte = ret }; 440 } 441 442 static inline pteval_t pte_val(pte_t pte) 443 { 444 pteval_t ret; 445 446 if (sizeof(pteval_t) > sizeof(long)) 447 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val, 448 pte.pte, (u64)pte.pte >> 32); 449 else 450 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val, 451 pte.pte); 452 453 return ret; 454 } 455 456 static inline pgd_t __pgd(pgdval_t val) 457 { 458 pgdval_t ret; 459 460 if (sizeof(pgdval_t) > sizeof(long)) 461 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd, 462 val, (u64)val >> 32); 463 else 464 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd, 465 val); 466 467 return (pgd_t) { ret }; 468 } 469 470 static inline pgdval_t pgd_val(pgd_t pgd) 471 { 472 pgdval_t ret; 473 474 if (sizeof(pgdval_t) > sizeof(long)) 475 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val, 476 pgd.pgd, (u64)pgd.pgd >> 32); 477 else 478 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val, 479 pgd.pgd); 480 481 return ret; 482 } 483 484 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION 485 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr, 486 pte_t *ptep) 487 { 488 pteval_t ret; 489 490 ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start, 491 mm, addr, ptep); 492 493 return (pte_t) { .pte = ret }; 494 } 495 496 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr, 497 pte_t *ptep, pte_t pte) 498 { 499 if (sizeof(pteval_t) > sizeof(long)) 500 /* 5 arg words */ 501 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte); 502 else 503 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit, 504 mm, addr, ptep, pte.pte); 505 } 506 507 static inline void set_pte(pte_t *ptep, pte_t pte) 508 { 509 if (sizeof(pteval_t) > sizeof(long)) 510 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep, 511 pte.pte, (u64)pte.pte >> 32); 512 else 513 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep, 514 pte.pte); 515 } 516 517 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 518 pte_t *ptep, pte_t pte) 519 { 520 if (sizeof(pteval_t) > sizeof(long)) 521 /* 5 arg words */ 522 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte); 523 else 524 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte); 525 } 526 527 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, 528 pmd_t *pmdp, pmd_t pmd) 529 { 530 if (sizeof(pmdval_t) > sizeof(long)) 531 /* 5 arg words */ 532 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd); 533 else 534 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp, 535 native_pmd_val(pmd)); 536 } 537 538 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 539 { 540 pmdval_t val = native_pmd_val(pmd); 541 542 if (sizeof(pmdval_t) > sizeof(long)) 543 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32); 544 else 545 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val); 546 } 547 548 #if PAGETABLE_LEVELS >= 3 549 static inline pmd_t __pmd(pmdval_t val) 550 { 551 pmdval_t ret; 552 553 if (sizeof(pmdval_t) > sizeof(long)) 554 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd, 555 val, (u64)val >> 32); 556 else 557 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd, 558 val); 559 560 return (pmd_t) { ret }; 561 } 562 563 static inline pmdval_t pmd_val(pmd_t pmd) 564 { 565 pmdval_t ret; 566 567 if (sizeof(pmdval_t) > sizeof(long)) 568 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val, 569 pmd.pmd, (u64)pmd.pmd >> 32); 570 else 571 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val, 572 pmd.pmd); 573 574 return ret; 575 } 576 577 static inline void set_pud(pud_t *pudp, pud_t pud) 578 { 579 pudval_t val = native_pud_val(pud); 580 581 if (sizeof(pudval_t) > sizeof(long)) 582 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp, 583 val, (u64)val >> 32); 584 else 585 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp, 586 val); 587 } 588 #if PAGETABLE_LEVELS == 4 589 static inline pud_t __pud(pudval_t val) 590 { 591 pudval_t ret; 592 593 if (sizeof(pudval_t) > sizeof(long)) 594 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud, 595 val, (u64)val >> 32); 596 else 597 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud, 598 val); 599 600 return (pud_t) { ret }; 601 } 602 603 static inline pudval_t pud_val(pud_t pud) 604 { 605 pudval_t ret; 606 607 if (sizeof(pudval_t) > sizeof(long)) 608 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val, 609 pud.pud, (u64)pud.pud >> 32); 610 else 611 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val, 612 pud.pud); 613 614 return ret; 615 } 616 617 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd) 618 { 619 pgdval_t val = native_pgd_val(pgd); 620 621 if (sizeof(pgdval_t) > sizeof(long)) 622 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp, 623 val, (u64)val >> 32); 624 else 625 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp, 626 val); 627 } 628 629 static inline void pgd_clear(pgd_t *pgdp) 630 { 631 set_pgd(pgdp, __pgd(0)); 632 } 633 634 static inline void pud_clear(pud_t *pudp) 635 { 636 set_pud(pudp, __pud(0)); 637 } 638 639 #endif /* PAGETABLE_LEVELS == 4 */ 640 641 #endif /* PAGETABLE_LEVELS >= 3 */ 642 643 #ifdef CONFIG_X86_PAE 644 /* Special-case pte-setting operations for PAE, which can't update a 645 64-bit pte atomically */ 646 static inline void set_pte_atomic(pte_t *ptep, pte_t pte) 647 { 648 PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep, 649 pte.pte, pte.pte >> 32); 650 } 651 652 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, 653 pte_t *ptep) 654 { 655 PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep); 656 } 657 658 static inline void pmd_clear(pmd_t *pmdp) 659 { 660 PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp); 661 } 662 #else /* !CONFIG_X86_PAE */ 663 static inline void set_pte_atomic(pte_t *ptep, pte_t pte) 664 { 665 set_pte(ptep, pte); 666 } 667 668 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, 669 pte_t *ptep) 670 { 671 set_pte_at(mm, addr, ptep, __pte(0)); 672 } 673 674 static inline void pmd_clear(pmd_t *pmdp) 675 { 676 set_pmd(pmdp, __pmd(0)); 677 } 678 #endif /* CONFIG_X86_PAE */ 679 680 #define __HAVE_ARCH_START_CONTEXT_SWITCH 681 static inline void arch_start_context_switch(struct task_struct *prev) 682 { 683 PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev); 684 } 685 686 static inline void arch_end_context_switch(struct task_struct *next) 687 { 688 PVOP_VCALL1(pv_cpu_ops.end_context_switch, next); 689 } 690 691 #define __HAVE_ARCH_ENTER_LAZY_MMU_MODE 692 static inline void arch_enter_lazy_mmu_mode(void) 693 { 694 PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter); 695 } 696 697 static inline void arch_leave_lazy_mmu_mode(void) 698 { 699 PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave); 700 } 701 702 static inline void arch_flush_lazy_mmu_mode(void) 703 { 704 PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush); 705 } 706 707 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx, 708 phys_addr_t phys, pgprot_t flags) 709 { 710 pv_mmu_ops.set_fixmap(idx, phys, flags); 711 } 712 713 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS) 714 715 static __always_inline void __ticket_lock_spinning(struct arch_spinlock *lock, 716 __ticket_t ticket) 717 { 718 PVOP_VCALLEE2(pv_lock_ops.lock_spinning, lock, ticket); 719 } 720 721 static __always_inline void __ticket_unlock_kick(struct arch_spinlock *lock, 722 __ticket_t ticket) 723 { 724 PVOP_VCALL2(pv_lock_ops.unlock_kick, lock, ticket); 725 } 726 727 #endif 728 729 #ifdef CONFIG_X86_32 730 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;" 731 #define PV_RESTORE_REGS "popl %edx; popl %ecx;" 732 733 /* save and restore all caller-save registers, except return value */ 734 #define PV_SAVE_ALL_CALLER_REGS "pushl %ecx;" 735 #define PV_RESTORE_ALL_CALLER_REGS "popl %ecx;" 736 737 #define PV_FLAGS_ARG "0" 738 #define PV_EXTRA_CLOBBERS 739 #define PV_VEXTRA_CLOBBERS 740 #else 741 /* save and restore all caller-save registers, except return value */ 742 #define PV_SAVE_ALL_CALLER_REGS \ 743 "push %rcx;" \ 744 "push %rdx;" \ 745 "push %rsi;" \ 746 "push %rdi;" \ 747 "push %r8;" \ 748 "push %r9;" \ 749 "push %r10;" \ 750 "push %r11;" 751 #define PV_RESTORE_ALL_CALLER_REGS \ 752 "pop %r11;" \ 753 "pop %r10;" \ 754 "pop %r9;" \ 755 "pop %r8;" \ 756 "pop %rdi;" \ 757 "pop %rsi;" \ 758 "pop %rdx;" \ 759 "pop %rcx;" 760 761 /* We save some registers, but all of them, that's too much. We clobber all 762 * caller saved registers but the argument parameter */ 763 #define PV_SAVE_REGS "pushq %%rdi;" 764 #define PV_RESTORE_REGS "popq %%rdi;" 765 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi" 766 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi" 767 #define PV_FLAGS_ARG "D" 768 #endif 769 770 /* 771 * Generate a thunk around a function which saves all caller-save 772 * registers except for the return value. This allows C functions to 773 * be called from assembler code where fewer than normal registers are 774 * available. It may also help code generation around calls from C 775 * code if the common case doesn't use many registers. 776 * 777 * When a callee is wrapped in a thunk, the caller can assume that all 778 * arg regs and all scratch registers are preserved across the 779 * call. The return value in rax/eax will not be saved, even for void 780 * functions. 781 */ 782 #define PV_CALLEE_SAVE_REGS_THUNK(func) \ 783 extern typeof(func) __raw_callee_save_##func; \ 784 static void *__##func##__ __used = func; \ 785 \ 786 asm(".pushsection .text;" \ 787 "__raw_callee_save_" #func ": " \ 788 PV_SAVE_ALL_CALLER_REGS \ 789 "call " #func ";" \ 790 PV_RESTORE_ALL_CALLER_REGS \ 791 "ret;" \ 792 ".popsection") 793 794 /* Get a reference to a callee-save function */ 795 #define PV_CALLEE_SAVE(func) \ 796 ((struct paravirt_callee_save) { __raw_callee_save_##func }) 797 798 /* Promise that "func" already uses the right calling convention */ 799 #define __PV_IS_CALLEE_SAVE(func) \ 800 ((struct paravirt_callee_save) { func }) 801 802 static inline notrace unsigned long arch_local_save_flags(void) 803 { 804 return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl); 805 } 806 807 static inline notrace void arch_local_irq_restore(unsigned long f) 808 { 809 PVOP_VCALLEE1(pv_irq_ops.restore_fl, f); 810 } 811 812 static inline notrace void arch_local_irq_disable(void) 813 { 814 PVOP_VCALLEE0(pv_irq_ops.irq_disable); 815 } 816 817 static inline notrace void arch_local_irq_enable(void) 818 { 819 PVOP_VCALLEE0(pv_irq_ops.irq_enable); 820 } 821 822 static inline notrace unsigned long arch_local_irq_save(void) 823 { 824 unsigned long f; 825 826 f = arch_local_save_flags(); 827 arch_local_irq_disable(); 828 return f; 829 } 830 831 832 /* Make sure as little as possible of this mess escapes. */ 833 #undef PARAVIRT_CALL 834 #undef __PVOP_CALL 835 #undef __PVOP_VCALL 836 #undef PVOP_VCALL0 837 #undef PVOP_CALL0 838 #undef PVOP_VCALL1 839 #undef PVOP_CALL1 840 #undef PVOP_VCALL2 841 #undef PVOP_CALL2 842 #undef PVOP_VCALL3 843 #undef PVOP_CALL3 844 #undef PVOP_VCALL4 845 #undef PVOP_CALL4 846 847 extern void default_banner(void); 848 849 #else /* __ASSEMBLY__ */ 850 851 #define _PVSITE(ptype, clobbers, ops, word, algn) \ 852 771:; \ 853 ops; \ 854 772:; \ 855 .pushsection .parainstructions,"a"; \ 856 .align algn; \ 857 word 771b; \ 858 .byte ptype; \ 859 .byte 772b-771b; \ 860 .short clobbers; \ 861 .popsection 862 863 864 #define COND_PUSH(set, mask, reg) \ 865 .if ((~(set)) & mask); push %reg; .endif 866 #define COND_POP(set, mask, reg) \ 867 .if ((~(set)) & mask); pop %reg; .endif 868 869 #ifdef CONFIG_X86_64 870 871 #define PV_SAVE_REGS(set) \ 872 COND_PUSH(set, CLBR_RAX, rax); \ 873 COND_PUSH(set, CLBR_RCX, rcx); \ 874 COND_PUSH(set, CLBR_RDX, rdx); \ 875 COND_PUSH(set, CLBR_RSI, rsi); \ 876 COND_PUSH(set, CLBR_RDI, rdi); \ 877 COND_PUSH(set, CLBR_R8, r8); \ 878 COND_PUSH(set, CLBR_R9, r9); \ 879 COND_PUSH(set, CLBR_R10, r10); \ 880 COND_PUSH(set, CLBR_R11, r11) 881 #define PV_RESTORE_REGS(set) \ 882 COND_POP(set, CLBR_R11, r11); \ 883 COND_POP(set, CLBR_R10, r10); \ 884 COND_POP(set, CLBR_R9, r9); \ 885 COND_POP(set, CLBR_R8, r8); \ 886 COND_POP(set, CLBR_RDI, rdi); \ 887 COND_POP(set, CLBR_RSI, rsi); \ 888 COND_POP(set, CLBR_RDX, rdx); \ 889 COND_POP(set, CLBR_RCX, rcx); \ 890 COND_POP(set, CLBR_RAX, rax) 891 892 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 8) 893 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8) 894 #define PARA_INDIRECT(addr) *addr(%rip) 895 #else 896 #define PV_SAVE_REGS(set) \ 897 COND_PUSH(set, CLBR_EAX, eax); \ 898 COND_PUSH(set, CLBR_EDI, edi); \ 899 COND_PUSH(set, CLBR_ECX, ecx); \ 900 COND_PUSH(set, CLBR_EDX, edx) 901 #define PV_RESTORE_REGS(set) \ 902 COND_POP(set, CLBR_EDX, edx); \ 903 COND_POP(set, CLBR_ECX, ecx); \ 904 COND_POP(set, CLBR_EDI, edi); \ 905 COND_POP(set, CLBR_EAX, eax) 906 907 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 4) 908 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4) 909 #define PARA_INDIRECT(addr) *%cs:addr 910 #endif 911 912 #define INTERRUPT_RETURN \ 913 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE, \ 914 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret)) 915 916 #define DISABLE_INTERRUPTS(clobbers) \ 917 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \ 918 PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE); \ 919 call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable); \ 920 PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);) 921 922 #define ENABLE_INTERRUPTS(clobbers) \ 923 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers, \ 924 PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE); \ 925 call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable); \ 926 PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);) 927 928 #define USERGS_SYSRET32 \ 929 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret32), \ 930 CLBR_NONE, \ 931 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret32)) 932 933 #ifdef CONFIG_X86_32 934 #define GET_CR0_INTO_EAX \ 935 push %ecx; push %edx; \ 936 call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \ 937 pop %edx; pop %ecx 938 939 #define ENABLE_INTERRUPTS_SYSEXIT \ 940 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit), \ 941 CLBR_NONE, \ 942 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit)) 943 944 945 #else /* !CONFIG_X86_32 */ 946 947 /* 948 * If swapgs is used while the userspace stack is still current, 949 * there's no way to call a pvop. The PV replacement *must* be 950 * inlined, or the swapgs instruction must be trapped and emulated. 951 */ 952 #define SWAPGS_UNSAFE_STACK \ 953 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \ 954 swapgs) 955 956 /* 957 * Note: swapgs is very special, and in practise is either going to be 958 * implemented with a single "swapgs" instruction or something very 959 * special. Either way, we don't need to save any registers for 960 * it. 961 */ 962 #define SWAPGS \ 963 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \ 964 call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs) \ 965 ) 966 967 #define GET_CR2_INTO_RAX \ 968 call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2) 969 970 #define PARAVIRT_ADJUST_EXCEPTION_FRAME \ 971 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \ 972 CLBR_NONE, \ 973 call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame)) 974 975 #define USERGS_SYSRET64 \ 976 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64), \ 977 CLBR_NONE, \ 978 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64)) 979 980 #define ENABLE_INTERRUPTS_SYSEXIT32 \ 981 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit), \ 982 CLBR_NONE, \ 983 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit)) 984 #endif /* CONFIG_X86_32 */ 985 986 #endif /* __ASSEMBLY__ */ 987 #else /* CONFIG_PARAVIRT */ 988 # define default_banner x86_init_noop 989 #endif /* !CONFIG_PARAVIRT */ 990 #endif /* _ASM_X86_PARAVIRT_H */ 991