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 static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
 217 {
 218         return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
 219 }
 220
 221 #define rdtscp(low, high, aux)                          \
 222 do {                                                    \
 223         int __aux;                                      \
 224         unsigned long __val = paravirt_rdtscp(&__aux);  \
 225         (low) = (u32)__val;                             \
 226         (high) = (u32)(__val >> 32);                    \
 227         (aux) = __aux;                                  \
 228 } while (0)
 229
 230 #define rdtscpll(val, aux)                              \
 231 do {                                                    \
 232         unsigned long __aux;                            \
 233         val = paravirt_rdtscp(&__aux);                  \
 234         (aux) = __aux;                                  \
 235 } while (0)
 236
 237 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
 238 {
 239         PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
 240 }
 241
 242 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
 243 {
 244         PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
 245 }
 246
 247 static inline void load_TR_desc(void)
 248 {
 249         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
 250 }
 251 static inline void load_gdt(const struct desc_ptr *dtr)
 252 {
 253         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
 254 }
 255 static inline void load_idt(const struct desc_ptr *dtr)
 256 {
 257         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
 258 }
 259 static inline void set_ldt(const void *addr, unsigned entries)
 260 {
 261         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
 262 }
 263 static inline void store_gdt(struct desc_ptr *dtr)
 264 {
 265         PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
 266 }
 267 static inline void store_idt(struct desc_ptr *dtr)
 268 {
 269         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
 270 }
 271 static inline unsigned long paravirt_store_tr(void)
 272 {
 273         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
 274 }
 275 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 276 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 277 {
 278         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
 279 }
 280
 281 #ifdef CONFIG_X86_64
 282 static inline void load_gs_index(unsigned int gs)
 283 {
 284         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
 285 }
 286 #endif
 287
 288 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
 289                                    const void *desc)
 290 {
 291         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
 292 }
 293
 294 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
 295                                    void *desc, int type)
 296 {
 297         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
 298 }
 299
 300 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
 301 {
 302         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
 303 }
 304 static inline void set_iopl_mask(unsigned mask)
 305 {
 306         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
 307 }
 308
 309 /* The paravirtualized I/O functions */
 310 static inline void slow_down_io(void)
 311 {
 312         pv_cpu_ops.io_delay();
 313 #ifdef REALLY_SLOW_IO
 314         pv_cpu_ops.io_delay();
 315         pv_cpu_ops.io_delay();
 316         pv_cpu_ops.io_delay();
 317 #endif
 318 }
 319
 320 #ifdef CONFIG_SMP
 321 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
 322                                     unsigned long start_esp)
 323 {
 324         PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
 325                     phys_apicid, start_eip, start_esp);
 326 }
 327 #endif
 328
 329 static inline void paravirt_activate_mm(struct mm_struct *prev,
 330                                         struct mm_struct *next)
 331 {
 332         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
 333 }
 334
 335 static inline void arch_dup_mmap(struct mm_struct *oldmm,
 336                                  struct mm_struct *mm)
 337 {
 338         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
 339 }
 340
 341 static inline void arch_exit_mmap(struct mm_struct *mm)
 342 {
 343         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
 344 }
 345
 346 static inline void __flush_tlb(void)
 347 {
 348         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
 349 }
 350 static inline void __flush_tlb_global(void)
 351 {
 352         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
 353 }
 354 static inline void __flush_tlb_single(unsigned long addr)
 355 {
 356         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
 357 }
 358
 359 static inline void flush_tlb_others(const struct cpumask *cpumask,
 360                                     struct mm_struct *mm,
 361                                     unsigned long va)
 362 {
 363         PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, cpumask, mm, va);
 364 }
 365
 366 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
 367 {
 368         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
 369 }
 370
 371 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
 372 {
 373         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
 374 }
 375
 376 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
 377 {
 378         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
 379 }
 380 static inline void paravirt_release_pte(unsigned long pfn)
 381 {
 382         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
 383 }
 384
 385 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
 386 {
 387         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
 388 }
 389
 390 static inline void paravirt_release_pmd(unsigned long pfn)
 391 {
 392         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
 393 }
 394
 395 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
 396 {
 397         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
 398 }
 399 static inline void paravirt_release_pud(unsigned long pfn)
 400 {
 401         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
 402 }
 403
 404 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
 405                               pte_t *ptep)
 406 {
 407         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
 408 }
 409 static inline void pmd_update(struct mm_struct *mm, unsigned long addr,
 410                               pmd_t *pmdp)
 411 {
 412         PVOP_VCALL3(pv_mmu_ops.pmd_update, mm, addr, pmdp);
 413 }
 414
 415 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
 416                                     pte_t *ptep)
 417 {
 418         PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
 419 }
 420
 421 static inline void pmd_update_defer(struct mm_struct *mm, unsigned long addr,
 422                                     pmd_t *pmdp)
 423 {
 424         PVOP_VCALL3(pv_mmu_ops.pmd_update_defer, mm, addr, pmdp);
 425 }
 426
 427 static inline pte_t __pte(pteval_t val)
 428 {
 429         pteval_t ret;
 430
 431         if (sizeof(pteval_t) > sizeof(long))
 432                 ret = PVOP_CALLEE2(pteval_t,
 433                                    pv_mmu_ops.make_pte,
 434                                    val, (u64)val >> 32);
 435         else
 436                 ret = PVOP_CALLEE1(pteval_t,
 437                                    pv_mmu_ops.make_pte,
 438                                    val);
 439
 440         return (pte_t) { .pte = ret };
 441 }
 442
 443 static inline pteval_t pte_val(pte_t pte)
 444 {
 445         pteval_t ret;
 446
 447         if (sizeof(pteval_t) > sizeof(long))
 448                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
 449                                    pte.pte, (u64)pte.pte >> 32);
 450         else
 451                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
 452                                    pte.pte);
 453
 454         return ret;
 455 }
 456
 457 static inline pgd_t __pgd(pgdval_t val)
 458 {
 459         pgdval_t ret;
 460
 461         if (sizeof(pgdval_t) > sizeof(long))
 462                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
 463                                    val, (u64)val >> 32);
 464         else
 465                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
 466                                    val);
 467
 468         return (pgd_t) { ret };
 469 }
 470
 471 static inline pgdval_t pgd_val(pgd_t pgd)
 472 {
 473         pgdval_t ret;
 474
 475         if (sizeof(pgdval_t) > sizeof(long))
 476                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
 477                                     pgd.pgd, (u64)pgd.pgd >> 32);
 478         else
 479                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
 480                                     pgd.pgd);
 481
 482         return ret;
 483 }
 484
 485 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 486 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
 487                                            pte_t *ptep)
 488 {
 489         pteval_t ret;
 490
 491         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
 492                          mm, addr, ptep);
 493
 494         return (pte_t) { .pte = ret };
 495 }
 496
 497 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 498                                            pte_t *ptep, pte_t pte)
 499 {
 500         if (sizeof(pteval_t) > sizeof(long))
 501                 /* 5 arg words */
 502                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
 503         else
 504                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
 505                             mm, addr, ptep, pte.pte);
 506 }
 507
 508 static inline void set_pte(pte_t *ptep, pte_t pte)
 509 {
 510         if (sizeof(pteval_t) > sizeof(long))
 511                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
 512                             pte.pte, (u64)pte.pte >> 32);
 513         else
 514                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
 515                             pte.pte);
 516 }
 517
 518 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 519                               pte_t *ptep, pte_t pte)
 520 {
 521         if (sizeof(pteval_t) > sizeof(long))
 522                 /* 5 arg words */
 523                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
 524         else
 525                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
 526 }
 527
 528 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 529 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 530                               pmd_t *pmdp, pmd_t pmd)
 531 {
 532         if (sizeof(pmdval_t) > sizeof(long))
 533                 /* 5 arg words */
 534                 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
 535         else
 536                 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
 537                             native_pmd_val(pmd));
 538 }
 539 #endif
 540
 541 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 542 {
 543         pmdval_t val = native_pmd_val(pmd);
 544
 545         if (sizeof(pmdval_t) > sizeof(long))
 546                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
 547         else
 548                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
 549 }
 550
 551 #if PAGETABLE_LEVELS >= 3
 552 static inline pmd_t __pmd(pmdval_t val)
 553 {
 554         pmdval_t ret;
 555
 556         if (sizeof(pmdval_t) > sizeof(long))
 557                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
 558                                    val, (u64)val >> 32);
 559         else
 560                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
 561                                    val);
 562
 563         return (pmd_t) { ret };
 564 }
 565
 566 static inline pmdval_t pmd_val(pmd_t pmd)
 567 {
 568         pmdval_t ret;
 569
 570         if (sizeof(pmdval_t) > sizeof(long))
 571                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
 572                                     pmd.pmd, (u64)pmd.pmd >> 32);
 573         else
 574                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
 575                                     pmd.pmd);
 576
 577         return ret;
 578 }
 579
 580 static inline void set_pud(pud_t *pudp, pud_t pud)
 581 {
 582         pudval_t val = native_pud_val(pud);
 583
 584         if (sizeof(pudval_t) > sizeof(long))
 585                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
 586                             val, (u64)val >> 32);
 587         else
 588                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
 589                             val);
 590 }
 591 #if PAGETABLE_LEVELS == 4
 592 static inline pud_t __pud(pudval_t val)
 593 {
 594         pudval_t ret;
 595
 596         if (sizeof(pudval_t) > sizeof(long))
 597                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
 598                                    val, (u64)val >> 32);
 599         else
 600                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
 601                                    val);
 602
 603         return (pud_t) { ret };
 604 }
 605
 606 static inline pudval_t pud_val(pud_t pud)
 607 {
 608         pudval_t ret;
 609
 610         if (sizeof(pudval_t) > sizeof(long))
 611                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
 612                                     pud.pud, (u64)pud.pud >> 32);
 613         else
 614                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
 615                                     pud.pud);
 616
 617         return ret;
 618 }
 619
 620 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
 621 {
 622         pgdval_t val = native_pgd_val(pgd);
 623
 624         if (sizeof(pgdval_t) > sizeof(long))
 625                 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
 626                             val, (u64)val >> 32);
 627         else
 628                 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
 629                             val);
 630 }
 631
 632 static inline void pgd_clear(pgd_t *pgdp)
 633 {
 634         set_pgd(pgdp, __pgd(0));
 635 }
 636
 637 static inline void pud_clear(pud_t *pudp)
 638 {
 639         set_pud(pudp, __pud(0));
 640 }
 641
 642 #endif  /* PAGETABLE_LEVELS == 4 */
 643
 644 #endif  /* PAGETABLE_LEVELS >= 3 */
 645
 646 #ifdef CONFIG_X86_PAE
 647 /* Special-case pte-setting operations for PAE, which can't update a
 648    64-bit pte atomically */
 649 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 650 {
 651         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
 652                     pte.pte, pte.pte >> 32);
 653 }
 654
 655 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 656                              pte_t *ptep)
 657 {
 658         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
 659 }
 660
 661 static inline void pmd_clear(pmd_t *pmdp)
 662 {
 663         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
 664 }
 665 #else  /* !CONFIG_X86_PAE */
 666 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 667 {
 668         set_pte(ptep, pte);
 669 }
 670
 671 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 672                              pte_t *ptep)
 673 {
 674         set_pte_at(mm, addr, ptep, __pte(0));
 675 }
 676
 677 static inline void pmd_clear(pmd_t *pmdp)
 678 {
 679         set_pmd(pmdp, __pmd(0));
 680 }
 681 #endif  /* CONFIG_X86_PAE */
 682
 683 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
 684 static inline void arch_start_context_switch(struct task_struct *prev)
 685 {
 686         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
 687 }
 688
 689 static inline void arch_end_context_switch(struct task_struct *next)
 690 {
 691         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
 692 }
 693
 694 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 695 static inline void arch_enter_lazy_mmu_mode(void)
 696 {
 697         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
 698 }
 699
 700 static inline void arch_leave_lazy_mmu_mode(void)
 701 {
 702         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
 703 }
 704
 705 void arch_flush_lazy_mmu_mode(void);
 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 inline int arch_spin_is_locked(struct arch_spinlock *lock)
 716 {
 717         return PVOP_CALL1(int, pv_lock_ops.spin_is_locked, lock);
 718 }
 719
 720 static inline int arch_spin_is_contended(struct arch_spinlock *lock)
 721 {
 722         return PVOP_CALL1(int, pv_lock_ops.spin_is_contended, lock);
 723 }
 724 #define arch_spin_is_contended  arch_spin_is_contended
 725
 726 static __always_inline void arch_spin_lock(struct arch_spinlock *lock)
 727 {
 728         PVOP_VCALL1(pv_lock_ops.spin_lock, lock);
 729 }
 730
 731 static __always_inline void arch_spin_lock_flags(struct arch_spinlock *lock,
 732                                                   unsigned long flags)
 733 {
 734         PVOP_VCALL2(pv_lock_ops.spin_lock_flags, lock, flags);
 735 }
 736
 737 static __always_inline int arch_spin_trylock(struct arch_spinlock *lock)
 738 {
 739         return PVOP_CALL1(int, pv_lock_ops.spin_trylock, lock);
 740 }
 741
 742 static __always_inline void arch_spin_unlock(struct arch_spinlock *lock)
 743 {
 744         PVOP_VCALL1(pv_lock_ops.spin_unlock, lock);
 745 }
 746
 747 #endif
 748
 749 #ifdef CONFIG_X86_32
 750 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
 751 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
 752
 753 /* save and restore all caller-save registers, except return value */
 754 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
 755 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
 756
 757 #define PV_FLAGS_ARG "0"
 758 #define PV_EXTRA_CLOBBERS
 759 #define PV_VEXTRA_CLOBBERS
 760 #else
 761 /* save and restore all caller-save registers, except return value */
 762 #define PV_SAVE_ALL_CALLER_REGS                                         \
 763         "push %rcx;"                                                    \
 764         "push %rdx;"                                                    \
 765         "push %rsi;"                                                    \
 766         "push %rdi;"                                                    \
 767         "push %r8;"                                                     \
 768         "push %r9;"                                                     \
 769         "push %r10;"                                                    \
 770         "push %r11;"
 771 #define PV_RESTORE_ALL_CALLER_REGS                                      \
 772         "pop %r11;"                                                     \
 773         "pop %r10;"                                                     \
 774         "pop %r9;"                                                      \
 775         "pop %r8;"                                                      \
 776         "pop %rdi;"                                                     \
 777         "pop %rsi;"                                                     \
 778         "pop %rdx;"                                                     \
 779         "pop %rcx;"
 780
 781 /* We save some registers, but all of them, that's too much. We clobber all
 782  * caller saved registers but the argument parameter */
 783 #define PV_SAVE_REGS "pushq %%rdi;"
 784 #define PV_RESTORE_REGS "popq %%rdi;"
 785 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
 786 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
 787 #define PV_FLAGS_ARG "D"
 788 #endif
 789
 790 /*
 791  * Generate a thunk around a function which saves all caller-save
 792  * registers except for the return value.  This allows C functions to
 793  * be called from assembler code where fewer than normal registers are
 794  * available.  It may also help code generation around calls from C
 795  * code if the common case doesn't use many registers.
 796  *
 797  * When a callee is wrapped in a thunk, the caller can assume that all
 798  * arg regs and all scratch registers are preserved across the
 799  * call. The return value in rax/eax will not be saved, even for void
 800  * functions.
 801  */
 802 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
 803         extern typeof(func) __raw_callee_save_##func;                   \
 804         static void *__##func##__ __used = func;                        \
 805                                                                         \
 806         asm(".pushsection .text;"                                       \
 807             "__raw_callee_save_" #func ": "                             \
 808             PV_SAVE_ALL_CALLER_REGS                                     \
 809             "call " #func ";"                                           \
 810             PV_RESTORE_ALL_CALLER_REGS                                  \
 811             "ret;"                                                      \
 812             ".popsection")
 813
 814 /* Get a reference to a callee-save function */
 815 #define PV_CALLEE_SAVE(func)                                            \
 816         ((struct paravirt_callee_save) { __raw_callee_save_##func })
 817
 818 /* Promise that "func" already uses the right calling convention */
 819 #define __PV_IS_CALLEE_SAVE(func)                       \
 820         ((struct paravirt_callee_save) { func })
 821
 822 static inline notrace unsigned long arch_local_save_flags(void)
 823 {
 824         return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
 825 }
 826
 827 static inline notrace void arch_local_irq_restore(unsigned long f)
 828 {
 829         PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
 830 }
 831
 832 static inline notrace void arch_local_irq_disable(void)
 833 {
 834         PVOP_VCALLEE0(pv_irq_ops.irq_disable);
 835 }
 836
 837 static inline notrace void arch_local_irq_enable(void)
 838 {
 839         PVOP_VCALLEE0(pv_irq_ops.irq_enable);
 840 }
 841
 842 static inline notrace unsigned long arch_local_irq_save(void)
 843 {
 844         unsigned long f;
 845
 846         f = arch_local_save_flags();
 847         arch_local_irq_disable();
 848         return f;
 849 }
 850
 851
 852 /* Make sure as little as possible of this mess escapes. */
 853 #undef PARAVIRT_CALL
 854 #undef __PVOP_CALL
 855 #undef __PVOP_VCALL
 856 #undef PVOP_VCALL0
 857 #undef PVOP_CALL0
 858 #undef PVOP_VCALL1
 859 #undef PVOP_CALL1
 860 #undef PVOP_VCALL2
 861 #undef PVOP_CALL2
 862 #undef PVOP_VCALL3
 863 #undef PVOP_CALL3
 864 #undef PVOP_VCALL4
 865 #undef PVOP_CALL4
 866
 867 extern void default_banner(void);
 868
 869 #else  /* __ASSEMBLY__ */
 870
 871 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
 872 771:;                                           \
 873         ops;                                    \
 874 772:;                                           \
 875         .pushsection .parainstructions,"a";     \
 876          .align algn;                           \
 877          word 771b;                             \
 878          .byte ptype;                           \
 879          .byte 772b-771b;                       \
 880          .short clobbers;                       \
 881         .popsection
 882
 883
 884 #define COND_PUSH(set, mask, reg)                       \
 885         .if ((~(set)) & mask); push %reg; .endif
 886 #define COND_POP(set, mask, reg)                        \
 887         .if ((~(set)) & mask); pop %reg; .endif
 888
 889 #ifdef CONFIG_X86_64
 890
 891 #define PV_SAVE_REGS(set)                       \
 892         COND_PUSH(set, CLBR_RAX, rax);          \
 893         COND_PUSH(set, CLBR_RCX, rcx);          \
 894         COND_PUSH(set, CLBR_RDX, rdx);          \
 895         COND_PUSH(set, CLBR_RSI, rsi);          \
 896         COND_PUSH(set, CLBR_RDI, rdi);          \
 897         COND_PUSH(set, CLBR_R8, r8);            \
 898         COND_PUSH(set, CLBR_R9, r9);            \
 899         COND_PUSH(set, CLBR_R10, r10);          \
 900         COND_PUSH(set, CLBR_R11, r11)
 901 #define PV_RESTORE_REGS(set)                    \
 902         COND_POP(set, CLBR_R11, r11);           \
 903         COND_POP(set, CLBR_R10, r10);           \
 904         COND_POP(set, CLBR_R9, r9);             \
 905         COND_POP(set, CLBR_R8, r8);             \
 906         COND_POP(set, CLBR_RDI, rdi);           \
 907         COND_POP(set, CLBR_RSI, rsi);           \
 908         COND_POP(set, CLBR_RDX, rdx);           \
 909         COND_POP(set, CLBR_RCX, rcx);           \
 910         COND_POP(set, CLBR_RAX, rax)
 911
 912 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
 913 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
 914 #define PARA_INDIRECT(addr)     *addr(%rip)
 915 #else
 916 #define PV_SAVE_REGS(set)                       \
 917         COND_PUSH(set, CLBR_EAX, eax);          \
 918         COND_PUSH(set, CLBR_EDI, edi);          \
 919         COND_PUSH(set, CLBR_ECX, ecx);          \
 920         COND_PUSH(set, CLBR_EDX, edx)
 921 #define PV_RESTORE_REGS(set)                    \
 922         COND_POP(set, CLBR_EDX, edx);           \
 923         COND_POP(set, CLBR_ECX, ecx);           \
 924         COND_POP(set, CLBR_EDI, edi);           \
 925         COND_POP(set, CLBR_EAX, eax)
 926
 927 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
 928 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
 929 #define PARA_INDIRECT(addr)     *%cs:addr
 930 #endif
 931
 932 #define INTERRUPT_RETURN                                                \
 933         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
 934                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
 935
 936 #define DISABLE_INTERRUPTS(clobbers)                                    \
 937         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
 938                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 939                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
 940                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 941
 942 #define ENABLE_INTERRUPTS(clobbers)                                     \
 943         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
 944                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 945                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
 946                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 947
 948 #define USERGS_SYSRET32                                                 \
 949         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret32),       \
 950                   CLBR_NONE,                                            \
 951                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret32))
 952
 953 #ifdef CONFIG_X86_32
 954 #define GET_CR0_INTO_EAX                                \
 955         push %ecx; push %edx;                           \
 956         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
 957         pop %edx; pop %ecx
 958
 959 #define ENABLE_INTERRUPTS_SYSEXIT                                       \
 960         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
 961                   CLBR_NONE,                                            \
 962                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
 963
 964
 965 #else   /* !CONFIG_X86_32 */
 966
 967 /*
 968  * If swapgs is used while the userspace stack is still current,
 969  * there's no way to call a pvop.  The PV replacement *must* be
 970  * inlined, or the swapgs instruction must be trapped and emulated.
 971  */
 972 #define SWAPGS_UNSAFE_STACK                                             \
 973         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 974                   swapgs)
 975
 976 /*
 977  * Note: swapgs is very special, and in practise is either going to be
 978  * implemented with a single "swapgs" instruction or something very
 979  * special.  Either way, we don't need to save any registers for
 980  * it.
 981  */
 982 #define SWAPGS                                                          \
 983         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 984                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
 985                  )
 986
 987 #define GET_CR2_INTO_RAX                                \
 988         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
 989
 990 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
 991         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
 992                   CLBR_NONE,                                            \
 993                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
 994
 995 #define USERGS_SYSRET64                                                 \
 996         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
 997                   CLBR_NONE,                                            \
 998                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
 999
1000 #define ENABLE_INTERRUPTS_SYSEXIT32                                     \
1001         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
1002                   CLBR_NONE,                                            \
1003                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
1004 #endif  /* CONFIG_X86_32 */
1005
1006 #endif /* __ASSEMBLY__ */
1007 #else  /* CONFIG_PARAVIRT */
1008 # define default_banner x86_init_noop
1009 #endif /* !CONFIG_PARAVIRT */
1010 #endif /* _ASM_X86_PARAVIRT_H */