arch/x86/include/asm/paravirt.h

   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 int paravirt_has_feature(unsigned int feature)
  23 {
  24         WARN_ON_ONCE(!pv_info.paravirt_enabled);
  25         return (pv_info.features & feature);
  26 }
  27
  28 static inline void load_sp0(struct tss_struct *tss,
  29                              struct thread_struct *thread)
  30 {
  31         PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
  32 }
  33
  34 /* The paravirtualized CPUID instruction. */
  35 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
  36                            unsigned int *ecx, unsigned int *edx)
  37 {
  38         PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
  39 }
  40
  41 /*
  42  * These special macros can be used to get or set a debugging register
  43  */
  44 static inline unsigned long paravirt_get_debugreg(int reg)
  45 {
  46         return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
  47 }
  48 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
  49 static inline void set_debugreg(unsigned long val, int reg)
  50 {
  51         PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
  52 }
  53
  54 static inline void clts(void)
  55 {
  56         PVOP_VCALL0(pv_cpu_ops.clts);
  57 }
  58
  59 static inline unsigned long read_cr0(void)
  60 {
  61         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
  62 }
  63
  64 static inline void write_cr0(unsigned long x)
  65 {
  66         PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
  67 }
  68
  69 static inline unsigned long read_cr2(void)
  70 {
  71         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
  72 }
  73
  74 static inline void write_cr2(unsigned long x)
  75 {
  76         PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
  77 }
  78
  79 static inline unsigned long read_cr3(void)
  80 {
  81         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
  82 }
  83
  84 static inline void write_cr3(unsigned long x)
  85 {
  86         PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
  87 }
  88
  89 static inline unsigned long __read_cr4(void)
  90 {
  91         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
  92 }
  93 static inline unsigned long __read_cr4_safe(void)
  94 {
  95         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
  96 }
  97
  98 static inline void __write_cr4(unsigned long x)
  99 {
 100         PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
 101 }
 102
 103 #ifdef CONFIG_X86_64
 104 static inline unsigned long read_cr8(void)
 105 {
 106         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
 107 }
 108
 109 static inline void write_cr8(unsigned long x)
 110 {
 111         PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
 112 }
 113 #endif
 114
 115 static inline void arch_safe_halt(void)
 116 {
 117         PVOP_VCALL0(pv_irq_ops.safe_halt);
 118 }
 119
 120 static inline void halt(void)
 121 {
 122         PVOP_VCALL0(pv_irq_ops.halt);
 123 }
 124
 125 static inline void wbinvd(void)
 126 {
 127         PVOP_VCALL0(pv_cpu_ops.wbinvd);
 128 }
 129
 130 #define get_kernel_rpl()  (pv_info.kernel_rpl)
 131
 132 static inline u64 paravirt_read_msr(unsigned msr, int *err)
 133 {
 134         return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
 135 }
 136
 137 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
 138 {
 139         return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
 140 }
 141
 142 /* These should all do BUG_ON(_err), but our headers are too tangled. */
 143 #define rdmsr(msr, val1, val2)                  \
 144 do {                                            \
 145         int _err;                               \
 146         u64 _l = paravirt_read_msr(msr, &_err); \
 147         val1 = (u32)_l;                         \
 148         val2 = _l >> 32;                        \
 149 } while (0)
 150
 151 #define wrmsr(msr, val1, val2)                  \
 152 do {                                            \
 153         paravirt_write_msr(msr, val1, val2);    \
 154 } while (0)
 155
 156 #define rdmsrl(msr, val)                        \
 157 do {                                            \
 158         int _err;                               \
 159         val = paravirt_read_msr(msr, &_err);    \
 160 } while (0)
 161
 162 static inline void wrmsrl(unsigned msr, u64 val)
 163 {
 164         wrmsr(msr, (u32)val, (u32)(val>>32));
 165 }
 166
 167 #define wrmsr_safe(msr, a, b)   paravirt_write_msr(msr, a, b)
 168
 169 /* rdmsr with exception handling */
 170 #define rdmsr_safe(msr, a, b)                   \
 171 ({                                              \
 172         int _err;                               \
 173         u64 _l = paravirt_read_msr(msr, &_err); \
 174         (*a) = (u32)_l;                         \
 175         (*b) = _l >> 32;                        \
 176         _err;                                   \
 177 })
 178
 179 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
 180 {
 181         int err;
 182
 183         *p = paravirt_read_msr(msr, &err);
 184         return err;
 185 }
 186
 187 static inline unsigned long long paravirt_sched_clock(void)
 188 {
 189         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
 190 }
 191
 192 struct static_key;
 193 extern struct static_key paravirt_steal_enabled;
 194 extern struct static_key paravirt_steal_rq_enabled;
 195
 196 static inline u64 paravirt_steal_clock(int cpu)
 197 {
 198         return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
 199 }
 200
 201 static inline unsigned long long paravirt_read_pmc(int counter)
 202 {
 203         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
 204 }
 205
 206 #define rdpmc(counter, low, high)               \
 207 do {                                            \
 208         u64 _l = paravirt_read_pmc(counter);    \
 209         low = (u32)_l;                          \
 210         high = _l >> 32;                        \
 211 } while (0)
 212
 213 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))
 214
 215 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
 216 {
 217         PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
 218 }
 219
 220 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
 221 {
 222         PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
 223 }
 224
 225 static inline void load_TR_desc(void)
 226 {
 227         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
 228 }
 229 static inline void load_gdt(const struct desc_ptr *dtr)
 230 {
 231         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
 232 }
 233 static inline void load_idt(const struct desc_ptr *dtr)
 234 {
 235         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
 236 }
 237 static inline void set_ldt(const void *addr, unsigned entries)
 238 {
 239         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
 240 }
 241 static inline void store_idt(struct desc_ptr *dtr)
 242 {
 243         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
 244 }
 245 static inline unsigned long paravirt_store_tr(void)
 246 {
 247         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
 248 }
 249 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 250 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 251 {
 252         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
 253 }
 254
 255 #ifdef CONFIG_X86_64
 256 static inline void load_gs_index(unsigned int gs)
 257 {
 258         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
 259 }
 260 #endif
 261
 262 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
 263                                    const void *desc)
 264 {
 265         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
 266 }
 267
 268 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
 269                                    void *desc, int type)
 270 {
 271         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
 272 }
 273
 274 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
 275 {
 276         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
 277 }
 278 static inline void set_iopl_mask(unsigned mask)
 279 {
 280         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
 281 }
 282
 283 /* The paravirtualized I/O functions */
 284 static inline void slow_down_io(void)
 285 {
 286         pv_cpu_ops.io_delay();
 287 #ifdef REALLY_SLOW_IO
 288         pv_cpu_ops.io_delay();
 289         pv_cpu_ops.io_delay();
 290         pv_cpu_ops.io_delay();
 291 #endif
 292 }
 293
 294 static inline void paravirt_activate_mm(struct mm_struct *prev,
 295                                         struct mm_struct *next)
 296 {
 297         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
 298 }
 299
 300 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 301                                           struct mm_struct *mm)
 302 {
 303         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
 304 }
 305
 306 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
 307 {
 308         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
 309 }
 310
 311 static inline void __flush_tlb(void)
 312 {
 313         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
 314 }
 315 static inline void __flush_tlb_global(void)
 316 {
 317         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
 318 }
 319 static inline void __flush_tlb_single(unsigned long addr)
 320 {
 321         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
 322 }
 323
 324 static inline void flush_tlb_others(const struct cpumask *cpumask,
 325                                     struct mm_struct *mm,
 326                                     unsigned long start,
 327                                     unsigned long end)
 328 {
 329         PVOP_VCALL4(pv_mmu_ops.flush_tlb_others, cpumask, mm, start, end);
 330 }
 331
 332 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
 333 {
 334         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
 335 }
 336
 337 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
 338 {
 339         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
 340 }
 341
 342 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
 343 {
 344         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
 345 }
 346 static inline void paravirt_release_pte(unsigned long pfn)
 347 {
 348         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
 349 }
 350
 351 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
 352 {
 353         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
 354 }
 355
 356 static inline void paravirt_release_pmd(unsigned long pfn)
 357 {
 358         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
 359 }
 360
 361 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
 362 {
 363         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
 364 }
 365 static inline void paravirt_release_pud(unsigned long pfn)
 366 {
 367         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
 368 }
 369
 370 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
 371                               pte_t *ptep)
 372 {
 373         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
 374 }
 375
 376 static inline pte_t __pte(pteval_t val)
 377 {
 378         pteval_t ret;
 379
 380         if (sizeof(pteval_t) > sizeof(long))
 381                 ret = PVOP_CALLEE2(pteval_t,
 382                                    pv_mmu_ops.make_pte,
 383                                    val, (u64)val >> 32);
 384         else
 385                 ret = PVOP_CALLEE1(pteval_t,
 386                                    pv_mmu_ops.make_pte,
 387                                    val);
 388
 389         return (pte_t) { .pte = ret };
 390 }
 391
 392 static inline pteval_t pte_val(pte_t pte)
 393 {
 394         pteval_t ret;
 395
 396         if (sizeof(pteval_t) > sizeof(long))
 397                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
 398                                    pte.pte, (u64)pte.pte >> 32);
 399         else
 400                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
 401                                    pte.pte);
 402
 403         return ret;
 404 }
 405
 406 static inline pgd_t __pgd(pgdval_t val)
 407 {
 408         pgdval_t ret;
 409
 410         if (sizeof(pgdval_t) > sizeof(long))
 411                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
 412                                    val, (u64)val >> 32);
 413         else
 414                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
 415                                    val);
 416
 417         return (pgd_t) { ret };
 418 }
 419
 420 static inline pgdval_t pgd_val(pgd_t pgd)
 421 {
 422         pgdval_t ret;
 423
 424         if (sizeof(pgdval_t) > sizeof(long))
 425                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
 426                                     pgd.pgd, (u64)pgd.pgd >> 32);
 427         else
 428                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
 429                                     pgd.pgd);
 430
 431         return ret;
 432 }
 433
 434 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 435 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
 436                                            pte_t *ptep)
 437 {
 438         pteval_t ret;
 439
 440         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
 441                          mm, addr, ptep);
 442
 443         return (pte_t) { .pte = ret };
 444 }
 445
 446 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 447                                            pte_t *ptep, pte_t pte)
 448 {
 449         if (sizeof(pteval_t) > sizeof(long))
 450                 /* 5 arg words */
 451                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
 452         else
 453                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
 454                             mm, addr, ptep, pte.pte);
 455 }
 456
 457 static inline void set_pte(pte_t *ptep, pte_t pte)
 458 {
 459         if (sizeof(pteval_t) > sizeof(long))
 460                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
 461                             pte.pte, (u64)pte.pte >> 32);
 462         else
 463                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
 464                             pte.pte);
 465 }
 466
 467 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 468                               pte_t *ptep, pte_t pte)
 469 {
 470         if (sizeof(pteval_t) > sizeof(long))
 471                 /* 5 arg words */
 472                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
 473         else
 474                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
 475 }
 476
 477 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 478                               pmd_t *pmdp, pmd_t pmd)
 479 {
 480         if (sizeof(pmdval_t) > sizeof(long))
 481                 /* 5 arg words */
 482                 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
 483         else
 484                 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
 485                             native_pmd_val(pmd));
 486 }
 487
 488 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 489 {
 490         pmdval_t val = native_pmd_val(pmd);
 491
 492         if (sizeof(pmdval_t) > sizeof(long))
 493                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
 494         else
 495                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
 496 }
 497
 498 #if CONFIG_PGTABLE_LEVELS >= 3
 499 static inline pmd_t __pmd(pmdval_t val)
 500 {
 501         pmdval_t ret;
 502
 503         if (sizeof(pmdval_t) > sizeof(long))
 504                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
 505                                    val, (u64)val >> 32);
 506         else
 507                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
 508                                    val);
 509
 510         return (pmd_t) { ret };
 511 }
 512
 513 static inline pmdval_t pmd_val(pmd_t pmd)
 514 {
 515         pmdval_t ret;
 516
 517         if (sizeof(pmdval_t) > sizeof(long))
 518                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
 519                                     pmd.pmd, (u64)pmd.pmd >> 32);
 520         else
 521                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
 522                                     pmd.pmd);
 523
 524         return ret;
 525 }
 526
 527 static inline void set_pud(pud_t *pudp, pud_t pud)
 528 {
 529         pudval_t val = native_pud_val(pud);
 530
 531         if (sizeof(pudval_t) > sizeof(long))
 532                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
 533                             val, (u64)val >> 32);
 534         else
 535                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
 536                             val);
 537 }
 538 #if CONFIG_PGTABLE_LEVELS == 4
 539 static inline pud_t __pud(pudval_t val)
 540 {
 541         pudval_t ret;
 542
 543         if (sizeof(pudval_t) > sizeof(long))
 544                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
 545                                    val, (u64)val >> 32);
 546         else
 547                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
 548                                    val);
 549
 550         return (pud_t) { ret };
 551 }
 552
 553 static inline pudval_t pud_val(pud_t pud)
 554 {
 555         pudval_t ret;
 556
 557         if (sizeof(pudval_t) > sizeof(long))
 558                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
 559                                     pud.pud, (u64)pud.pud >> 32);
 560         else
 561                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
 562                                     pud.pud);
 563
 564         return ret;
 565 }
 566
 567 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
 568 {
 569         pgdval_t val = native_pgd_val(pgd);
 570
 571         if (sizeof(pgdval_t) > sizeof(long))
 572                 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
 573                             val, (u64)val >> 32);
 574         else
 575                 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
 576                             val);
 577 }
 578
 579 static inline void pgd_clear(pgd_t *pgdp)
 580 {
 581         set_pgd(pgdp, __pgd(0));
 582 }
 583
 584 static inline void pud_clear(pud_t *pudp)
 585 {
 586         set_pud(pudp, __pud(0));
 587 }
 588
 589 #endif  /* CONFIG_PGTABLE_LEVELS == 4 */
 590
 591 #endif  /* CONFIG_PGTABLE_LEVELS >= 3 */
 592
 593 #ifdef CONFIG_X86_PAE
 594 /* Special-case pte-setting operations for PAE, which can't update a
 595    64-bit pte atomically */
 596 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 597 {
 598         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
 599                     pte.pte, pte.pte >> 32);
 600 }
 601
 602 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 603                              pte_t *ptep)
 604 {
 605         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
 606 }
 607
 608 static inline void pmd_clear(pmd_t *pmdp)
 609 {
 610         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
 611 }
 612 #else  /* !CONFIG_X86_PAE */
 613 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 614 {
 615         set_pte(ptep, pte);
 616 }
 617
 618 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 619                              pte_t *ptep)
 620 {
 621         set_pte_at(mm, addr, ptep, __pte(0));
 622 }
 623
 624 static inline void pmd_clear(pmd_t *pmdp)
 625 {
 626         set_pmd(pmdp, __pmd(0));
 627 }
 628 #endif  /* CONFIG_X86_PAE */
 629
 630 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
 631 static inline void arch_start_context_switch(struct task_struct *prev)
 632 {
 633         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
 634 }
 635
 636 static inline void arch_end_context_switch(struct task_struct *next)
 637 {
 638         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
 639 }
 640
 641 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 642 static inline void arch_enter_lazy_mmu_mode(void)
 643 {
 644         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
 645 }
 646
 647 static inline void arch_leave_lazy_mmu_mode(void)
 648 {
 649         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
 650 }
 651
 652 static inline void arch_flush_lazy_mmu_mode(void)
 653 {
 654         PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush);
 655 }
 656
 657 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
 658                                 phys_addr_t phys, pgprot_t flags)
 659 {
 660         pv_mmu_ops.set_fixmap(idx, phys, flags);
 661 }
 662
 663 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
 664
 665 #ifdef CONFIG_QUEUED_SPINLOCKS
 666
 667 static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock,
 668                                                         u32 val)
 669 {
 670         PVOP_VCALL2(pv_lock_ops.queued_spin_lock_slowpath, lock, val);
 671 }
 672
 673 static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock)
 674 {
 675         PVOP_VCALLEE1(pv_lock_ops.queued_spin_unlock, lock);
 676 }
 677
 678 static __always_inline void pv_wait(u8 *ptr, u8 val)
 679 {
 680         PVOP_VCALL2(pv_lock_ops.wait, ptr, val);
 681 }
 682
 683 static __always_inline void pv_kick(int cpu)
 684 {
 685         PVOP_VCALL1(pv_lock_ops.kick, cpu);
 686 }
 687
 688 #else /* !CONFIG_QUEUED_SPINLOCKS */
 689
 690 static __always_inline void __ticket_lock_spinning(struct arch_spinlock *lock,
 691                                                         __ticket_t ticket)
 692 {
 693         PVOP_VCALLEE2(pv_lock_ops.lock_spinning, lock, ticket);
 694 }
 695
 696 static __always_inline void __ticket_unlock_kick(struct arch_spinlock *lock,
 697                                                         __ticket_t ticket)
 698 {
 699         PVOP_VCALL2(pv_lock_ops.unlock_kick, lock, ticket);
 700 }
 701
 702 #endif /* CONFIG_QUEUED_SPINLOCKS */
 703
 704 #endif /* SMP && PARAVIRT_SPINLOCKS */
 705
 706 #ifdef CONFIG_X86_32
 707 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
 708 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
 709
 710 /* save and restore all caller-save registers, except return value */
 711 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
 712 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
 713
 714 #define PV_FLAGS_ARG "0"
 715 #define PV_EXTRA_CLOBBERS
 716 #define PV_VEXTRA_CLOBBERS
 717 #else
 718 /* save and restore all caller-save registers, except return value */
 719 #define PV_SAVE_ALL_CALLER_REGS                                         \
 720         "push %rcx;"                                                    \
 721         "push %rdx;"                                                    \
 722         "push %rsi;"                                                    \
 723         "push %rdi;"                                                    \
 724         "push %r8;"                                                     \
 725         "push %r9;"                                                     \
 726         "push %r10;"                                                    \
 727         "push %r11;"
 728 #define PV_RESTORE_ALL_CALLER_REGS                                      \
 729         "pop %r11;"                                                     \
 730         "pop %r10;"                                                     \
 731         "pop %r9;"                                                      \
 732         "pop %r8;"                                                      \
 733         "pop %rdi;"                                                     \
 734         "pop %rsi;"                                                     \
 735         "pop %rdx;"                                                     \
 736         "pop %rcx;"
 737
 738 /* We save some registers, but all of them, that's too much. We clobber all
 739  * caller saved registers but the argument parameter */
 740 #define PV_SAVE_REGS "pushq %%rdi;"
 741 #define PV_RESTORE_REGS "popq %%rdi;"
 742 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
 743 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
 744 #define PV_FLAGS_ARG "D"
 745 #endif
 746
 747 /*
 748  * Generate a thunk around a function which saves all caller-save
 749  * registers except for the return value.  This allows C functions to
 750  * be called from assembler code where fewer than normal registers are
 751  * available.  It may also help code generation around calls from C
 752  * code if the common case doesn't use many registers.
 753  *
 754  * When a callee is wrapped in a thunk, the caller can assume that all
 755  * arg regs and all scratch registers are preserved across the
 756  * call. The return value in rax/eax will not be saved, even for void
 757  * functions.
 758  */
 759 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
 760         extern typeof(func) __raw_callee_save_##func;                   \
 761                                                                         \
 762         asm(".pushsection .text;"                                       \
 763             ".globl __raw_callee_save_" #func " ; "                     \
 764             "__raw_callee_save_" #func ": "                             \
 765             PV_SAVE_ALL_CALLER_REGS                                     \
 766             "call " #func ";"                                           \
 767             PV_RESTORE_ALL_CALLER_REGS                                  \
 768             "ret;"                                                      \
 769             ".popsection")
 770
 771 /* Get a reference to a callee-save function */
 772 #define PV_CALLEE_SAVE(func)                                            \
 773         ((struct paravirt_callee_save) { __raw_callee_save_##func })
 774
 775 /* Promise that "func" already uses the right calling convention */
 776 #define __PV_IS_CALLEE_SAVE(func)                       \
 777         ((struct paravirt_callee_save) { func })
 778
 779 static inline notrace unsigned long arch_local_save_flags(void)
 780 {
 781         return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
 782 }
 783
 784 static inline notrace void arch_local_irq_restore(unsigned long f)
 785 {
 786         PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
 787 }
 788
 789 static inline notrace void arch_local_irq_disable(void)
 790 {
 791         PVOP_VCALLEE0(pv_irq_ops.irq_disable);
 792 }
 793
 794 static inline notrace void arch_local_irq_enable(void)
 795 {
 796         PVOP_VCALLEE0(pv_irq_ops.irq_enable);
 797 }
 798
 799 static inline notrace unsigned long arch_local_irq_save(void)
 800 {
 801         unsigned long f;
 802
 803         f = arch_local_save_flags();
 804         arch_local_irq_disable();
 805         return f;
 806 }
 807
 808
 809 /* Make sure as little as possible of this mess escapes. */
 810 #undef PARAVIRT_CALL
 811 #undef __PVOP_CALL
 812 #undef __PVOP_VCALL
 813 #undef PVOP_VCALL0
 814 #undef PVOP_CALL0
 815 #undef PVOP_VCALL1
 816 #undef PVOP_CALL1
 817 #undef PVOP_VCALL2
 818 #undef PVOP_CALL2
 819 #undef PVOP_VCALL3
 820 #undef PVOP_CALL3
 821 #undef PVOP_VCALL4
 822 #undef PVOP_CALL4
 823
 824 extern void default_banner(void);
 825
 826 #else  /* __ASSEMBLY__ */
 827
 828 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
 829 771:;                                           \
 830         ops;                                    \
 831 772:;                                           \
 832         .pushsection .parainstructions,"a";     \
 833          .align algn;                           \
 834          word 771b;                             \
 835          .byte ptype;                           \
 836          .byte 772b-771b;                       \
 837          .short clobbers;                       \
 838         .popsection
 839
 840
 841 #define COND_PUSH(set, mask, reg)                       \
 842         .if ((~(set)) & mask); push %reg; .endif
 843 #define COND_POP(set, mask, reg)                        \
 844         .if ((~(set)) & mask); pop %reg; .endif
 845
 846 #ifdef CONFIG_X86_64
 847
 848 #define PV_SAVE_REGS(set)                       \
 849         COND_PUSH(set, CLBR_RAX, rax);          \
 850         COND_PUSH(set, CLBR_RCX, rcx);          \
 851         COND_PUSH(set, CLBR_RDX, rdx);          \
 852         COND_PUSH(set, CLBR_RSI, rsi);          \
 853         COND_PUSH(set, CLBR_RDI, rdi);          \
 854         COND_PUSH(set, CLBR_R8, r8);            \
 855         COND_PUSH(set, CLBR_R9, r9);            \
 856         COND_PUSH(set, CLBR_R10, r10);          \
 857         COND_PUSH(set, CLBR_R11, r11)
 858 #define PV_RESTORE_REGS(set)                    \
 859         COND_POP(set, CLBR_R11, r11);           \
 860         COND_POP(set, CLBR_R10, r10);           \
 861         COND_POP(set, CLBR_R9, r9);             \
 862         COND_POP(set, CLBR_R8, r8);             \
 863         COND_POP(set, CLBR_RDI, rdi);           \
 864         COND_POP(set, CLBR_RSI, rsi);           \
 865         COND_POP(set, CLBR_RDX, rdx);           \
 866         COND_POP(set, CLBR_RCX, rcx);           \
 867         COND_POP(set, CLBR_RAX, rax)
 868
 869 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
 870 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
 871 #define PARA_INDIRECT(addr)     *addr(%rip)
 872 #else
 873 #define PV_SAVE_REGS(set)                       \
 874         COND_PUSH(set, CLBR_EAX, eax);          \
 875         COND_PUSH(set, CLBR_EDI, edi);          \
 876         COND_PUSH(set, CLBR_ECX, ecx);          \
 877         COND_PUSH(set, CLBR_EDX, edx)
 878 #define PV_RESTORE_REGS(set)                    \
 879         COND_POP(set, CLBR_EDX, edx);           \
 880         COND_POP(set, CLBR_ECX, ecx);           \
 881         COND_POP(set, CLBR_EDI, edi);           \
 882         COND_POP(set, CLBR_EAX, eax)
 883
 884 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
 885 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
 886 #define PARA_INDIRECT(addr)     *%cs:addr
 887 #endif
 888
 889 #define INTERRUPT_RETURN                                                \
 890         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
 891                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
 892
 893 #define DISABLE_INTERRUPTS(clobbers)                                    \
 894         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
 895                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 896                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
 897                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 898
 899 #define ENABLE_INTERRUPTS(clobbers)                                     \
 900         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
 901                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 902                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
 903                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 904
 905 #ifdef CONFIG_X86_32
 906 #define GET_CR0_INTO_EAX                                \
 907         push %ecx; push %edx;                           \
 908         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
 909         pop %edx; pop %ecx
 910 #else   /* !CONFIG_X86_32 */
 911
 912 /*
 913  * If swapgs is used while the userspace stack is still current,
 914  * there's no way to call a pvop.  The PV replacement *must* be
 915  * inlined, or the swapgs instruction must be trapped and emulated.
 916  */
 917 #define SWAPGS_UNSAFE_STACK                                             \
 918         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 919                   swapgs)
 920
 921 /*
 922  * Note: swapgs is very special, and in practise is either going to be
 923  * implemented with a single "swapgs" instruction or something very
 924  * special.  Either way, we don't need to save any registers for
 925  * it.
 926  */
 927 #define SWAPGS                                                          \
 928         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 929                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
 930                  )
 931
 932 #define GET_CR2_INTO_RAX                                \
 933         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
 934
 935 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
 936         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
 937                   CLBR_NONE,                                            \
 938                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
 939
 940 #define USERGS_SYSRET64                                                 \
 941         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
 942                   CLBR_NONE,                                            \
 943                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
 944 #endif  /* CONFIG_X86_32 */
 945
 946 #endif /* __ASSEMBLY__ */
 947 #else  /* CONFIG_PARAVIRT */
 948 # define default_banner x86_init_noop
 949 #ifndef __ASSEMBLY__
 950 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 951                                           struct mm_struct *mm)
 952 {
 953 }
 954
 955 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
 956 {
 957 }
 958 #endif /* __ASSEMBLY__ */
 959 #endif /* !CONFIG_PARAVIRT */
 960 #endif /* _ASM_X86_PARAVIRT_H */