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 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_gdt(struct desc_ptr *dtr)
 266 {
 267         PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
 268 }
 269 static inline void store_idt(struct desc_ptr *dtr)
 270 {
 271         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
 272 }
 273 static inline unsigned long paravirt_store_tr(void)
 274 {
 275         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
 276 }
 277 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 278 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 279 {
 280         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
 281 }
 282
 283 #ifdef CONFIG_X86_64
 284 static inline void load_gs_index(unsigned int gs)
 285 {
 286         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
 287 }
 288 #endif
 289
 290 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
 291                                    const void *desc)
 292 {
 293         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
 294 }
 295
 296 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
 297                                    void *desc, int type)
 298 {
 299         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
 300 }
 301
 302 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
 303 {
 304         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
 305 }
 306 static inline void set_iopl_mask(unsigned mask)
 307 {
 308         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
 309 }
 310
 311 /* The paravirtualized I/O functions */
 312 static inline void slow_down_io(void)
 313 {
 314         pv_cpu_ops.io_delay();
 315 #ifdef REALLY_SLOW_IO
 316         pv_cpu_ops.io_delay();
 317         pv_cpu_ops.io_delay();
 318         pv_cpu_ops.io_delay();
 319 #endif
 320 }
 321
 322 #ifdef CONFIG_SMP
 323 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
 324                                     unsigned long start_esp)
 325 {
 326         PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
 327                     phys_apicid, start_eip, start_esp);
 328 }
 329 #endif
 330
 331 static inline void paravirt_activate_mm(struct mm_struct *prev,
 332                                         struct mm_struct *next)
 333 {
 334         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
 335 }
 336
 337 static inline void arch_dup_mmap(struct mm_struct *oldmm,
 338                                  struct mm_struct *mm)
 339 {
 340         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
 341 }
 342
 343 static inline void arch_exit_mmap(struct mm_struct *mm)
 344 {
 345         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
 346 }
 347
 348 static inline void __flush_tlb(void)
 349 {
 350         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
 351 }
 352 static inline void __flush_tlb_global(void)
 353 {
 354         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
 355 }
 356 static inline void __flush_tlb_single(unsigned long addr)
 357 {
 358         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
 359 }
 360
 361 static inline void flush_tlb_others(const struct cpumask *cpumask,
 362                                     struct mm_struct *mm,
 363                                     unsigned long start,
 364                                     unsigned long end)
 365 {
 366         PVOP_VCALL4(pv_mmu_ops.flush_tlb_others, cpumask, mm, start, end);
 367 }
 368
 369 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
 370 {
 371         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
 372 }
 373
 374 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
 375 {
 376         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
 377 }
 378
 379 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
 380 {
 381         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
 382 }
 383 static inline void paravirt_release_pte(unsigned long pfn)
 384 {
 385         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
 386 }
 387
 388 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
 389 {
 390         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
 391 }
 392
 393 static inline void paravirt_release_pmd(unsigned long pfn)
 394 {
 395         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
 396 }
 397
 398 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
 399 {
 400         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
 401 }
 402 static inline void paravirt_release_pud(unsigned long pfn)
 403 {
 404         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
 405 }
 406
 407 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
 408                               pte_t *ptep)
 409 {
 410         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
 411 }
 412 static inline void pmd_update(struct mm_struct *mm, unsigned long addr,
 413                               pmd_t *pmdp)
 414 {
 415         PVOP_VCALL3(pv_mmu_ops.pmd_update, mm, addr, pmdp);
 416 }
 417
 418 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
 419                                     pte_t *ptep)
 420 {
 421         PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
 422 }
 423
 424 static inline void pmd_update_defer(struct mm_struct *mm, unsigned long addr,
 425                                     pmd_t *pmdp)
 426 {
 427         PVOP_VCALL3(pv_mmu_ops.pmd_update_defer, mm, addr, pmdp);
 428 }
 429
 430 static inline pte_t __pte(pteval_t val)
 431 {
 432         pteval_t ret;
 433
 434         if (sizeof(pteval_t) > sizeof(long))
 435                 ret = PVOP_CALLEE2(pteval_t,
 436                                    pv_mmu_ops.make_pte,
 437                                    val, (u64)val >> 32);
 438         else
 439                 ret = PVOP_CALLEE1(pteval_t,
 440                                    pv_mmu_ops.make_pte,
 441                                    val);
 442
 443         return (pte_t) { .pte = ret };
 444 }
 445
 446 static inline pteval_t pte_val(pte_t pte)
 447 {
 448         pteval_t ret;
 449
 450         if (sizeof(pteval_t) > sizeof(long))
 451                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
 452                                    pte.pte, (u64)pte.pte >> 32);
 453         else
 454                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
 455                                    pte.pte);
 456
 457         return ret;
 458 }
 459
 460 static inline pgd_t __pgd(pgdval_t val)
 461 {
 462         pgdval_t ret;
 463
 464         if (sizeof(pgdval_t) > sizeof(long))
 465                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
 466                                    val, (u64)val >> 32);
 467         else
 468                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
 469                                    val);
 470
 471         return (pgd_t) { ret };
 472 }
 473
 474 static inline pgdval_t pgd_val(pgd_t pgd)
 475 {
 476         pgdval_t ret;
 477
 478         if (sizeof(pgdval_t) > sizeof(long))
 479                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
 480                                     pgd.pgd, (u64)pgd.pgd >> 32);
 481         else
 482                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
 483                                     pgd.pgd);
 484
 485         return ret;
 486 }
 487
 488 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 489 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
 490                                            pte_t *ptep)
 491 {
 492         pteval_t ret;
 493
 494         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
 495                          mm, addr, ptep);
 496
 497         return (pte_t) { .pte = ret };
 498 }
 499
 500 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 501                                            pte_t *ptep, pte_t pte)
 502 {
 503         if (sizeof(pteval_t) > sizeof(long))
 504                 /* 5 arg words */
 505                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
 506         else
 507                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
 508                             mm, addr, ptep, pte.pte);
 509 }
 510
 511 static inline void set_pte(pte_t *ptep, pte_t pte)
 512 {
 513         if (sizeof(pteval_t) > sizeof(long))
 514                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
 515                             pte.pte, (u64)pte.pte >> 32);
 516         else
 517                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
 518                             pte.pte);
 519 }
 520
 521 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 522                               pte_t *ptep, pte_t pte)
 523 {
 524         if (sizeof(pteval_t) > sizeof(long))
 525                 /* 5 arg words */
 526                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
 527         else
 528                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
 529 }
 530
 531 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 532 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 533                               pmd_t *pmdp, pmd_t pmd)
 534 {
 535         if (sizeof(pmdval_t) > sizeof(long))
 536                 /* 5 arg words */
 537                 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
 538         else
 539                 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
 540                             native_pmd_val(pmd));
 541 }
 542 #endif
 543
 544 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 545 {
 546         pmdval_t val = native_pmd_val(pmd);
 547
 548         if (sizeof(pmdval_t) > sizeof(long))
 549                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
 550         else
 551                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
 552 }
 553
 554 #if PAGETABLE_LEVELS >= 3
 555 static inline pmd_t __pmd(pmdval_t val)
 556 {
 557         pmdval_t ret;
 558
 559         if (sizeof(pmdval_t) > sizeof(long))
 560                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
 561                                    val, (u64)val >> 32);
 562         else
 563                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
 564                                    val);
 565
 566         return (pmd_t) { ret };
 567 }
 568
 569 static inline pmdval_t pmd_val(pmd_t pmd)
 570 {
 571         pmdval_t ret;
 572
 573         if (sizeof(pmdval_t) > sizeof(long))
 574                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
 575                                     pmd.pmd, (u64)pmd.pmd >> 32);
 576         else
 577                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
 578                                     pmd.pmd);
 579
 580         return ret;
 581 }
 582
 583 static inline void set_pud(pud_t *pudp, pud_t pud)
 584 {
 585         pudval_t val = native_pud_val(pud);
 586
 587         if (sizeof(pudval_t) > sizeof(long))
 588                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
 589                             val, (u64)val >> 32);
 590         else
 591                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
 592                             val);
 593 }
 594 #if PAGETABLE_LEVELS == 4
 595 static inline pud_t __pud(pudval_t val)
 596 {
 597         pudval_t ret;
 598
 599         if (sizeof(pudval_t) > sizeof(long))
 600                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
 601                                    val, (u64)val >> 32);
 602         else
 603                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
 604                                    val);
 605
 606         return (pud_t) { ret };
 607 }
 608
 609 static inline pudval_t pud_val(pud_t pud)
 610 {
 611         pudval_t ret;
 612
 613         if (sizeof(pudval_t) > sizeof(long))
 614                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
 615                                     pud.pud, (u64)pud.pud >> 32);
 616         else
 617                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
 618                                     pud.pud);
 619
 620         return ret;
 621 }
 622
 623 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
 624 {
 625         pgdval_t val = native_pgd_val(pgd);
 626
 627         if (sizeof(pgdval_t) > sizeof(long))
 628                 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
 629                             val, (u64)val >> 32);
 630         else
 631                 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
 632                             val);
 633 }
 634
 635 static inline void pgd_clear(pgd_t *pgdp)
 636 {
 637         set_pgd(pgdp, __pgd(0));
 638 }
 639
 640 static inline void pud_clear(pud_t *pudp)
 641 {
 642         set_pud(pudp, __pud(0));
 643 }
 644
 645 #endif  /* PAGETABLE_LEVELS == 4 */
 646
 647 #endif  /* PAGETABLE_LEVELS >= 3 */
 648
 649 #ifdef CONFIG_X86_PAE
 650 /* Special-case pte-setting operations for PAE, which can't update a
 651    64-bit pte atomically */
 652 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 653 {
 654         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
 655                     pte.pte, pte.pte >> 32);
 656 }
 657
 658 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 659                              pte_t *ptep)
 660 {
 661         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
 662 }
 663
 664 static inline void pmd_clear(pmd_t *pmdp)
 665 {
 666         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
 667 }
 668 #else  /* !CONFIG_X86_PAE */
 669 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 670 {
 671         set_pte(ptep, pte);
 672 }
 673
 674 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 675                              pte_t *ptep)
 676 {
 677         set_pte_at(mm, addr, ptep, __pte(0));
 678 }
 679
 680 static inline void pmd_clear(pmd_t *pmdp)
 681 {
 682         set_pmd(pmdp, __pmd(0));
 683 }
 684 #endif  /* CONFIG_X86_PAE */
 685
 686 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
 687 static inline void arch_start_context_switch(struct task_struct *prev)
 688 {
 689         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
 690 }
 691
 692 static inline void arch_end_context_switch(struct task_struct *next)
 693 {
 694         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
 695 }
 696
 697 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 698 static inline void arch_enter_lazy_mmu_mode(void)
 699 {
 700         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
 701 }
 702
 703 static inline void arch_leave_lazy_mmu_mode(void)
 704 {
 705         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
 706 }
 707
 708 void arch_flush_lazy_mmu_mode(void);
 709
 710 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
 711                                 phys_addr_t phys, pgprot_t flags)
 712 {
 713         pv_mmu_ops.set_fixmap(idx, phys, flags);
 714 }
 715
 716 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
 717
 718 static inline int arch_spin_is_locked(struct arch_spinlock *lock)
 719 {
 720         return PVOP_CALL1(int, pv_lock_ops.spin_is_locked, lock);
 721 }
 722
 723 static inline int arch_spin_is_contended(struct arch_spinlock *lock)
 724 {
 725         return PVOP_CALL1(int, pv_lock_ops.spin_is_contended, lock);
 726 }
 727 #define arch_spin_is_contended  arch_spin_is_contended
 728
 729 static __always_inline void arch_spin_lock(struct arch_spinlock *lock)
 730 {
 731         PVOP_VCALL1(pv_lock_ops.spin_lock, lock);
 732 }
 733
 734 static __always_inline void arch_spin_lock_flags(struct arch_spinlock *lock,
 735                                                   unsigned long flags)
 736 {
 737         PVOP_VCALL2(pv_lock_ops.spin_lock_flags, lock, flags);
 738 }
 739
 740 static __always_inline int arch_spin_trylock(struct arch_spinlock *lock)
 741 {
 742         return PVOP_CALL1(int, pv_lock_ops.spin_trylock, lock);
 743 }
 744
 745 static __always_inline void arch_spin_unlock(struct arch_spinlock *lock)
 746 {
 747         PVOP_VCALL1(pv_lock_ops.spin_unlock, lock);
 748 }
 749
 750 #endif
 751
 752 #ifdef CONFIG_X86_32
 753 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
 754 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
 755
 756 /* save and restore all caller-save registers, except return value */
 757 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
 758 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
 759
 760 #define PV_FLAGS_ARG "0"
 761 #define PV_EXTRA_CLOBBERS
 762 #define PV_VEXTRA_CLOBBERS
 763 #else
 764 /* save and restore all caller-save registers, except return value */
 765 #define PV_SAVE_ALL_CALLER_REGS                                         \
 766         "push %rcx;"                                                    \
 767         "push %rdx;"                                                    \
 768         "push %rsi;"                                                    \
 769         "push %rdi;"                                                    \
 770         "push %r8;"                                                     \
 771         "push %r9;"                                                     \
 772         "push %r10;"                                                    \
 773         "push %r11;"
 774 #define PV_RESTORE_ALL_CALLER_REGS                                      \
 775         "pop %r11;"                                                     \
 776         "pop %r10;"                                                     \
 777         "pop %r9;"                                                      \
 778         "pop %r8;"                                                      \
 779         "pop %rdi;"                                                     \
 780         "pop %rsi;"                                                     \
 781         "pop %rdx;"                                                     \
 782         "pop %rcx;"
 783
 784 /* We save some registers, but all of them, that's too much. We clobber all
 785  * caller saved registers but the argument parameter */
 786 #define PV_SAVE_REGS "pushq %%rdi;"
 787 #define PV_RESTORE_REGS "popq %%rdi;"
 788 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
 789 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
 790 #define PV_FLAGS_ARG "D"
 791 #endif
 792
 793 /*
 794  * Generate a thunk around a function which saves all caller-save
 795  * registers except for the return value.  This allows C functions to
 796  * be called from assembler code where fewer than normal registers are
 797  * available.  It may also help code generation around calls from C
 798  * code if the common case doesn't use many registers.
 799  *
 800  * When a callee is wrapped in a thunk, the caller can assume that all
 801  * arg regs and all scratch registers are preserved across the
 802  * call. The return value in rax/eax will not be saved, even for void
 803  * functions.
 804  */
 805 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
 806         extern typeof(func) __raw_callee_save_##func;                   \
 807         static void *__##func##__ __used = func;                        \
 808                                                                         \
 809         asm(".pushsection .text;"                                       \
 810             "__raw_callee_save_" #func ": "                             \
 811             PV_SAVE_ALL_CALLER_REGS                                     \
 812             "call " #func ";"                                           \
 813             PV_RESTORE_ALL_CALLER_REGS                                  \
 814             "ret;"                                                      \
 815             ".popsection")
 816
 817 /* Get a reference to a callee-save function */
 818 #define PV_CALLEE_SAVE(func)                                            \
 819         ((struct paravirt_callee_save) { __raw_callee_save_##func })
 820
 821 /* Promise that "func" already uses the right calling convention */
 822 #define __PV_IS_CALLEE_SAVE(func)                       \
 823         ((struct paravirt_callee_save) { func })
 824
 825 static inline notrace unsigned long arch_local_save_flags(void)
 826 {
 827         return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
 828 }
 829
 830 static inline notrace void arch_local_irq_restore(unsigned long f)
 831 {
 832         PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
 833 }
 834
 835 static inline notrace void arch_local_irq_disable(void)
 836 {
 837         PVOP_VCALLEE0(pv_irq_ops.irq_disable);
 838 }
 839
 840 static inline notrace void arch_local_irq_enable(void)
 841 {
 842         PVOP_VCALLEE0(pv_irq_ops.irq_enable);
 843 }
 844
 845 static inline notrace unsigned long arch_local_irq_save(void)
 846 {
 847         unsigned long f;
 848
 849         f = arch_local_save_flags();
 850         arch_local_irq_disable();
 851         return f;
 852 }
 853
 854
 855 /* Make sure as little as possible of this mess escapes. */
 856 #undef PARAVIRT_CALL
 857 #undef __PVOP_CALL
 858 #undef __PVOP_VCALL
 859 #undef PVOP_VCALL0
 860 #undef PVOP_CALL0
 861 #undef PVOP_VCALL1
 862 #undef PVOP_CALL1
 863 #undef PVOP_VCALL2
 864 #undef PVOP_CALL2
 865 #undef PVOP_VCALL3
 866 #undef PVOP_CALL3
 867 #undef PVOP_VCALL4
 868 #undef PVOP_CALL4
 869
 870 extern void default_banner(void);
 871
 872 #else  /* __ASSEMBLY__ */
 873
 874 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
 875 771:;                                           \
 876         ops;                                    \
 877 772:;                                           \
 878         .pushsection .parainstructions,"a";     \
 879          .align algn;                           \
 880          word 771b;                             \
 881          .byte ptype;                           \
 882          .byte 772b-771b;                       \
 883          .short clobbers;                       \
 884         .popsection
 885
 886
 887 #define COND_PUSH(set, mask, reg)                       \
 888         .if ((~(set)) & mask); push %reg; .endif
 889 #define COND_POP(set, mask, reg)                        \
 890         .if ((~(set)) & mask); pop %reg; .endif
 891
 892 #ifdef CONFIG_X86_64
 893
 894 #define PV_SAVE_REGS(set)                       \
 895         COND_PUSH(set, CLBR_RAX, rax);          \
 896         COND_PUSH(set, CLBR_RCX, rcx);          \
 897         COND_PUSH(set, CLBR_RDX, rdx);          \
 898         COND_PUSH(set, CLBR_RSI, rsi);          \
 899         COND_PUSH(set, CLBR_RDI, rdi);          \
 900         COND_PUSH(set, CLBR_R8, r8);            \
 901         COND_PUSH(set, CLBR_R9, r9);            \
 902         COND_PUSH(set, CLBR_R10, r10);          \
 903         COND_PUSH(set, CLBR_R11, r11)
 904 #define PV_RESTORE_REGS(set)                    \
 905         COND_POP(set, CLBR_R11, r11);           \
 906         COND_POP(set, CLBR_R10, r10);           \
 907         COND_POP(set, CLBR_R9, r9);             \
 908         COND_POP(set, CLBR_R8, r8);             \
 909         COND_POP(set, CLBR_RDI, rdi);           \
 910         COND_POP(set, CLBR_RSI, rsi);           \
 911         COND_POP(set, CLBR_RDX, rdx);           \
 912         COND_POP(set, CLBR_RCX, rcx);           \
 913         COND_POP(set, CLBR_RAX, rax)
 914
 915 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
 916 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
 917 #define PARA_INDIRECT(addr)     *addr(%rip)
 918 #else
 919 #define PV_SAVE_REGS(set)                       \
 920         COND_PUSH(set, CLBR_EAX, eax);          \
 921         COND_PUSH(set, CLBR_EDI, edi);          \
 922         COND_PUSH(set, CLBR_ECX, ecx);          \
 923         COND_PUSH(set, CLBR_EDX, edx)
 924 #define PV_RESTORE_REGS(set)                    \
 925         COND_POP(set, CLBR_EDX, edx);           \
 926         COND_POP(set, CLBR_ECX, ecx);           \
 927         COND_POP(set, CLBR_EDI, edi);           \
 928         COND_POP(set, CLBR_EAX, eax)
 929
 930 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
 931 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
 932 #define PARA_INDIRECT(addr)     *%cs:addr
 933 #endif
 934
 935 #define INTERRUPT_RETURN                                                \
 936         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
 937                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
 938
 939 #define DISABLE_INTERRUPTS(clobbers)                                    \
 940         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
 941                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 942                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
 943                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 944
 945 #define ENABLE_INTERRUPTS(clobbers)                                     \
 946         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
 947                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 948                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
 949                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 950
 951 #define USERGS_SYSRET32                                                 \
 952         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret32),       \
 953                   CLBR_NONE,                                            \
 954                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret32))
 955
 956 #ifdef CONFIG_X86_32
 957 #define GET_CR0_INTO_EAX                                \
 958         push %ecx; push %edx;                           \
 959         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
 960         pop %edx; pop %ecx
 961
 962 #define ENABLE_INTERRUPTS_SYSEXIT                                       \
 963         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
 964                   CLBR_NONE,                                            \
 965                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
 966
 967
 968 #else   /* !CONFIG_X86_32 */
 969
 970 /*
 971  * If swapgs is used while the userspace stack is still current,
 972  * there's no way to call a pvop.  The PV replacement *must* be
 973  * inlined, or the swapgs instruction must be trapped and emulated.
 974  */
 975 #define SWAPGS_UNSAFE_STACK                                             \
 976         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 977                   swapgs)
 978
 979 /*
 980  * Note: swapgs is very special, and in practise is either going to be
 981  * implemented with a single "swapgs" instruction or something very
 982  * special.  Either way, we don't need to save any registers for
 983  * it.
 984  */
 985 #define SWAPGS                                                          \
 986         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 987                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
 988                  )
 989
 990 #define GET_CR2_INTO_RAX                                \
 991         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
 992
 993 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
 994         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
 995                   CLBR_NONE,                                            \
 996                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
 997
 998 #define USERGS_SYSRET64                                                 \
 999         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
1000                   CLBR_NONE,                                            \
1001                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
1002
1003 #define ENABLE_INTERRUPTS_SYSEXIT32                                     \
1004         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
1005                   CLBR_NONE,                                            \
1006                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
1007 #endif  /* CONFIG_X86_32 */
1008
1009 #endif /* __ASSEMBLY__ */
1010 #else  /* CONFIG_PARAVIRT */
1011 # define default_banner x86_init_noop
1012 #endif /* !CONFIG_PARAVIRT */
1013 #endif /* _ASM_X86_PARAVIRT_H */