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   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/types.h>
  14 #include <linux/cpumask.h>
  15
  16 static inline int paravirt_enabled(void)
  17 {
  18         return pv_info.paravirt_enabled;
  19 }
  20
  21 static inline void load_sp0(struct tss_struct *tss,
  22                              struct thread_struct *thread)
  23 {
  24         PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
  25 }
  26
  27 static inline unsigned long get_wallclock(void)
  28 {
  29         return PVOP_CALL0(unsigned long, pv_time_ops.get_wallclock);
  30 }
  31
  32 static inline int set_wallclock(unsigned long nowtime)
  33 {
  34         return PVOP_CALL1(int, pv_time_ops.set_wallclock, nowtime);
  35 }
  36
  37 /* The paravirtualized CPUID instruction. */
  38 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
  39                            unsigned int *ecx, unsigned int *edx)
  40 {
  41         PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
  42 }
  43
  44 /*
  45  * These special macros can be used to get or set a debugging register
  46  */
  47 static inline unsigned long paravirt_get_debugreg(int reg)
  48 {
  49         return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
  50 }
  51 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
  52 static inline void set_debugreg(unsigned long val, int reg)
  53 {
  54         PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
  55 }
  56
  57 static inline void clts(void)
  58 {
  59         PVOP_VCALL0(pv_cpu_ops.clts);
  60 }
  61
  62 static inline unsigned long read_cr0(void)
  63 {
  64         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
  65 }
  66
  67 static inline void write_cr0(unsigned long x)
  68 {
  69         PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
  70 }
  71
  72 static inline unsigned long read_cr2(void)
  73 {
  74         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
  75 }
  76
  77 static inline void write_cr2(unsigned long x)
  78 {
  79         PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
  80 }
  81
  82 static inline unsigned long read_cr3(void)
  83 {
  84         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
  85 }
  86
  87 static inline void write_cr3(unsigned long x)
  88 {
  89         PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
  90 }
  91
  92 static inline unsigned long read_cr4(void)
  93 {
  94         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
  95 }
  96 static inline unsigned long read_cr4_safe(void)
  97 {
  98         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
  99 }
 100
 101 static inline void write_cr4(unsigned long x)
 102 {
 103         PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
 104 }
 105
 106 #ifdef CONFIG_X86_64
 107 static inline unsigned long read_cr8(void)
 108 {
 109         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
 110 }
 111
 112 static inline void write_cr8(unsigned long x)
 113 {
 114         PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
 115 }
 116 #endif
 117
 118 static inline void raw_safe_halt(void)
 119 {
 120         PVOP_VCALL0(pv_irq_ops.safe_halt);
 121 }
 122
 123 static inline void halt(void)
 124 {
 125         PVOP_VCALL0(pv_irq_ops.safe_halt);
 126 }
 127
 128 static inline void wbinvd(void)
 129 {
 130         PVOP_VCALL0(pv_cpu_ops.wbinvd);
 131 }
 132
 133 #define get_kernel_rpl()  (pv_info.kernel_rpl)
 134
 135 static inline u64 paravirt_read_msr(unsigned msr, int *err)
 136 {
 137         return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
 138 }
 139 static inline u64 paravirt_read_msr_amd(unsigned msr, int *err)
 140 {
 141         return PVOP_CALL2(u64, pv_cpu_ops.read_msr_amd, msr, err);
 142 }
 143 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
 144 {
 145         return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
 146 }
 147
 148 /* These should all do BUG_ON(_err), but our headers are too tangled. */
 149 #define rdmsr(msr, val1, val2)                  \
 150 do {                                            \
 151         int _err;                               \
 152         u64 _l = paravirt_read_msr(msr, &_err); \
 153         val1 = (u32)_l;                         \
 154         val2 = _l >> 32;                        \
 155 } while (0)
 156
 157 #define wrmsr(msr, val1, val2)                  \
 158 do {                                            \
 159         paravirt_write_msr(msr, val1, val2);    \
 160 } while (0)
 161
 162 #define rdmsrl(msr, val)                        \
 163 do {                                            \
 164         int _err;                               \
 165         val = paravirt_read_msr(msr, &_err);    \
 166 } while (0)
 167
 168 #define wrmsrl(msr, val)        wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
 169 #define wrmsr_safe(msr, a, b)   paravirt_write_msr(msr, a, b)
 170
 171 /* rdmsr with exception handling */
 172 #define rdmsr_safe(msr, a, b)                   \
 173 ({                                              \
 174         int _err;                               \
 175         u64 _l = paravirt_read_msr(msr, &_err); \
 176         (*a) = (u32)_l;                         \
 177         (*b) = _l >> 32;                        \
 178         _err;                                   \
 179 })
 180
 181 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
 182 {
 183         int err;
 184
 185         *p = paravirt_read_msr(msr, &err);
 186         return err;
 187 }
 188 static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
 189 {
 190         int err;
 191
 192         *p = paravirt_read_msr_amd(msr, &err);
 193         return err;
 194 }
 195
 196 static inline u64 paravirt_read_tsc(void)
 197 {
 198         return PVOP_CALL0(u64, pv_cpu_ops.read_tsc);
 199 }
 200
 201 #define rdtscl(low)                             \
 202 do {                                            \
 203         u64 _l = paravirt_read_tsc();           \
 204         low = (int)_l;                          \
 205 } while (0)
 206
 207 #define rdtscll(val) (val = paravirt_read_tsc())
 208
 209 static inline unsigned long long paravirt_sched_clock(void)
 210 {
 211         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
 212 }
 213
 214 static inline unsigned long long paravirt_read_pmc(int counter)
 215 {
 216         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
 217 }
 218
 219 #define rdpmc(counter, low, high)               \
 220 do {                                            \
 221         u64 _l = paravirt_read_pmc(counter);    \
 222         low = (u32)_l;                          \
 223         high = _l >> 32;                        \
 224 } while (0)
 225
 226 static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
 227 {
 228         return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
 229 }
 230
 231 #define rdtscp(low, high, aux)                          \
 232 do {                                                    \
 233         int __aux;                                      \
 234         unsigned long __val = paravirt_rdtscp(&__aux);  \
 235         (low) = (u32)__val;                             \
 236         (high) = (u32)(__val >> 32);                    \
 237         (aux) = __aux;                                  \
 238 } while (0)
 239
 240 #define rdtscpll(val, aux)                              \
 241 do {                                                    \
 242         unsigned long __aux;                            \
 243         val = paravirt_rdtscp(&__aux);                  \
 244         (aux) = __aux;                                  \
 245 } while (0)
 246
 247 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
 248 {
 249         PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
 250 }
 251
 252 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
 253 {
 254         PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
 255 }
 256
 257 static inline void load_TR_desc(void)
 258 {
 259         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
 260 }
 261 static inline void load_gdt(const struct desc_ptr *dtr)
 262 {
 263         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
 264 }
 265 static inline void load_idt(const struct desc_ptr *dtr)
 266 {
 267         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
 268 }
 269 static inline void set_ldt(const void *addr, unsigned entries)
 270 {
 271         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
 272 }
 273 static inline void store_gdt(struct desc_ptr *dtr)
 274 {
 275         PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
 276 }
 277 static inline void store_idt(struct desc_ptr *dtr)
 278 {
 279         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
 280 }
 281 static inline unsigned long paravirt_store_tr(void)
 282 {
 283         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
 284 }
 285 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 286 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 287 {
 288         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
 289 }
 290
 291 #ifdef CONFIG_X86_64
 292 static inline void load_gs_index(unsigned int gs)
 293 {
 294         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
 295 }
 296 #endif
 297
 298 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
 299                                    const void *desc)
 300 {
 301         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
 302 }
 303
 304 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
 305                                    void *desc, int type)
 306 {
 307         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
 308 }
 309
 310 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
 311 {
 312         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
 313 }
 314 static inline void set_iopl_mask(unsigned mask)
 315 {
 316         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
 317 }
 318
 319 /* The paravirtualized I/O functions */
 320 static inline void slow_down_io(void)
 321 {
 322         pv_cpu_ops.io_delay();
 323 #ifdef REALLY_SLOW_IO
 324         pv_cpu_ops.io_delay();
 325         pv_cpu_ops.io_delay();
 326         pv_cpu_ops.io_delay();
 327 #endif
 328 }
 329
 330 #ifdef CONFIG_SMP
 331 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
 332                                     unsigned long start_esp)
 333 {
 334         PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
 335                     phys_apicid, start_eip, start_esp);
 336 }
 337 #endif
 338
 339 static inline void paravirt_activate_mm(struct mm_struct *prev,
 340                                         struct mm_struct *next)
 341 {
 342         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
 343 }
 344
 345 static inline void arch_dup_mmap(struct mm_struct *oldmm,
 346                                  struct mm_struct *mm)
 347 {
 348         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
 349 }
 350
 351 static inline void arch_exit_mmap(struct mm_struct *mm)
 352 {
 353         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
 354 }
 355
 356 static inline void __flush_tlb(void)
 357 {
 358         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
 359 }
 360 static inline void __flush_tlb_global(void)
 361 {
 362         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
 363 }
 364 static inline void __flush_tlb_single(unsigned long addr)
 365 {
 366         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
 367 }
 368
 369 static inline void flush_tlb_others(const struct cpumask *cpumask,
 370                                     struct mm_struct *mm,
 371                                     unsigned long va)
 372 {
 373         PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, cpumask, mm, va);
 374 }
 375
 376 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
 377 {
 378         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
 379 }
 380
 381 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
 382 {
 383         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
 384 }
 385
 386 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
 387 {
 388         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
 389 }
 390 static inline void paravirt_release_pte(unsigned long pfn)
 391 {
 392         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
 393 }
 394
 395 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
 396 {
 397         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
 398 }
 399
 400 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
 401                                             unsigned long start, unsigned long count)
 402 {
 403         PVOP_VCALL4(pv_mmu_ops.alloc_pmd_clone, pfn, clonepfn, start, count);
 404 }
 405 static inline void paravirt_release_pmd(unsigned long pfn)
 406 {
 407         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
 408 }
 409
 410 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
 411 {
 412         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
 413 }
 414 static inline void paravirt_release_pud(unsigned long pfn)
 415 {
 416         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
 417 }
 418
 419 #ifdef CONFIG_HIGHPTE
 420 static inline void *kmap_atomic_pte(struct page *page, enum km_type type)
 421 {
 422         unsigned long ret;
 423         ret = PVOP_CALL2(unsigned long, pv_mmu_ops.kmap_atomic_pte, page, type);
 424         return (void *)ret;
 425 }
 426 #endif
 427
 428 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
 429                               pte_t *ptep)
 430 {
 431         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
 432 }
 433
 434 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
 435                                     pte_t *ptep)
 436 {
 437         PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
 438 }
 439
 440 static inline pte_t __pte(pteval_t val)
 441 {
 442         pteval_t ret;
 443
 444         if (sizeof(pteval_t) > sizeof(long))
 445                 ret = PVOP_CALLEE2(pteval_t,
 446                                    pv_mmu_ops.make_pte,
 447                                    val, (u64)val >> 32);
 448         else
 449                 ret = PVOP_CALLEE1(pteval_t,
 450                                    pv_mmu_ops.make_pte,
 451                                    val);
 452
 453         return (pte_t) { .pte = ret };
 454 }
 455
 456 static inline pteval_t pte_val(pte_t pte)
 457 {
 458         pteval_t ret;
 459
 460         if (sizeof(pteval_t) > sizeof(long))
 461                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
 462                                    pte.pte, (u64)pte.pte >> 32);
 463         else
 464                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
 465                                    pte.pte);
 466
 467         return ret;
 468 }
 469
 470 static inline pgd_t __pgd(pgdval_t val)
 471 {
 472         pgdval_t ret;
 473
 474         if (sizeof(pgdval_t) > sizeof(long))
 475                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
 476                                    val, (u64)val >> 32);
 477         else
 478                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
 479                                    val);
 480
 481         return (pgd_t) { ret };
 482 }
 483
 484 static inline pgdval_t pgd_val(pgd_t pgd)
 485 {
 486         pgdval_t ret;
 487
 488         if (sizeof(pgdval_t) > sizeof(long))
 489                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
 490                                     pgd.pgd, (u64)pgd.pgd >> 32);
 491         else
 492                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
 493                                     pgd.pgd);
 494
 495         return ret;
 496 }
 497
 498 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 499 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
 500                                            pte_t *ptep)
 501 {
 502         pteval_t ret;
 503
 504         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
 505                          mm, addr, ptep);
 506
 507         return (pte_t) { .pte = ret };
 508 }
 509
 510 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 511                                            pte_t *ptep, pte_t pte)
 512 {
 513         if (sizeof(pteval_t) > sizeof(long))
 514                 /* 5 arg words */
 515                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
 516         else
 517                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
 518                             mm, addr, ptep, pte.pte);
 519 }
 520
 521 static inline void set_pte(pte_t *ptep, pte_t pte)
 522 {
 523         if (sizeof(pteval_t) > sizeof(long))
 524                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
 525                             pte.pte, (u64)pte.pte >> 32);
 526         else
 527                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
 528                             pte.pte);
 529 }
 530
 531 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 532                               pte_t *ptep, pte_t pte)
 533 {
 534         if (sizeof(pteval_t) > sizeof(long))
 535                 /* 5 arg words */
 536                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
 537         else
 538                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
 539 }
 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 __raw_spin_is_locked(struct raw_spinlock *lock)
 716 {
 717         return PVOP_CALL1(int, pv_lock_ops.spin_is_locked, lock);
 718 }
 719
 720 static inline int __raw_spin_is_contended(struct raw_spinlock *lock)
 721 {
 722         return PVOP_CALL1(int, pv_lock_ops.spin_is_contended, lock);
 723 }
 724 #define __raw_spin_is_contended __raw_spin_is_contended
 725
 726 static __always_inline void __raw_spin_lock(struct raw_spinlock *lock)
 727 {
 728         PVOP_VCALL1(pv_lock_ops.spin_lock, lock);
 729 }
 730
 731 static __always_inline void __raw_spin_lock_flags(struct raw_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 __raw_spin_trylock(struct raw_spinlock *lock)
 738 {
 739         return PVOP_CALL1(int, pv_lock_ops.spin_trylock, lock);
 740 }
 741
 742 static __always_inline void __raw_spin_unlock(struct raw_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 unsigned long __raw_local_save_flags(void)
 823 {
 824         unsigned long f;
 825
 826         asm volatile(paravirt_alt(PARAVIRT_CALL)
 827                      : "=a"(f)
 828                      : paravirt_type(pv_irq_ops.save_fl),
 829                        paravirt_clobber(CLBR_EAX)
 830                      : "memory", "cc");
 831         return f;
 832 }
 833
 834 static inline void raw_local_irq_restore(unsigned long f)
 835 {
 836         asm volatile(paravirt_alt(PARAVIRT_CALL)
 837                      : "=a"(f)
 838                      : PV_FLAGS_ARG(f),
 839                        paravirt_type(pv_irq_ops.restore_fl),
 840                        paravirt_clobber(CLBR_EAX)
 841                      : "memory", "cc");
 842 }
 843
 844 static inline void raw_local_irq_disable(void)
 845 {
 846         asm volatile(paravirt_alt(PARAVIRT_CALL)
 847                      :
 848                      : paravirt_type(pv_irq_ops.irq_disable),
 849                        paravirt_clobber(CLBR_EAX)
 850                      : "memory", "eax", "cc");
 851 }
 852
 853 static inline void raw_local_irq_enable(void)
 854 {
 855         asm volatile(paravirt_alt(PARAVIRT_CALL)
 856                      :
 857                      : paravirt_type(pv_irq_ops.irq_enable),
 858                        paravirt_clobber(CLBR_EAX)
 859                      : "memory", "eax", "cc");
 860 }
 861
 862 static inline unsigned long __raw_local_irq_save(void)
 863 {
 864         unsigned long f;
 865
 866         f = __raw_local_save_flags();
 867         raw_local_irq_disable();
 868         return f;
 869 }
 870
 871
 872 /* Make sure as little as possible of this mess escapes. */
 873 #undef PARAVIRT_CALL
 874 #undef __PVOP_CALL
 875 #undef __PVOP_VCALL
 876 #undef PVOP_VCALL0
 877 #undef PVOP_CALL0
 878 #undef PVOP_VCALL1
 879 #undef PVOP_CALL1
 880 #undef PVOP_VCALL2
 881 #undef PVOP_CALL2
 882 #undef PVOP_VCALL3
 883 #undef PVOP_CALL3
 884 #undef PVOP_VCALL4
 885 #undef PVOP_CALL4
 886
 887 extern void default_banner(void);
 888
 889 #else  /* __ASSEMBLY__ */
 890
 891 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
 892 771:;                                           \
 893         ops;                                    \
 894 772:;                                           \
 895         .pushsection .parainstructions,"a";     \
 896          .align algn;                           \
 897          word 771b;                             \
 898          .byte ptype;                           \
 899          .byte 772b-771b;                       \
 900          .short clobbers;                       \
 901         .popsection
 902
 903
 904 #define COND_PUSH(set, mask, reg)                       \
 905         .if ((~(set)) & mask); push %reg; .endif
 906 #define COND_POP(set, mask, reg)                        \
 907         .if ((~(set)) & mask); pop %reg; .endif
 908
 909 #ifdef CONFIG_X86_64
 910
 911 #define PV_SAVE_REGS(set)                       \
 912         COND_PUSH(set, CLBR_RAX, rax);          \
 913         COND_PUSH(set, CLBR_RCX, rcx);          \
 914         COND_PUSH(set, CLBR_RDX, rdx);          \
 915         COND_PUSH(set, CLBR_RSI, rsi);          \
 916         COND_PUSH(set, CLBR_RDI, rdi);          \
 917         COND_PUSH(set, CLBR_R8, r8);            \
 918         COND_PUSH(set, CLBR_R9, r9);            \
 919         COND_PUSH(set, CLBR_R10, r10);          \
 920         COND_PUSH(set, CLBR_R11, r11)
 921 #define PV_RESTORE_REGS(set)                    \
 922         COND_POP(set, CLBR_R11, r11);           \
 923         COND_POP(set, CLBR_R10, r10);           \
 924         COND_POP(set, CLBR_R9, r9);             \
 925         COND_POP(set, CLBR_R8, r8);             \
 926         COND_POP(set, CLBR_RDI, rdi);           \
 927         COND_POP(set, CLBR_RSI, rsi);           \
 928         COND_POP(set, CLBR_RDX, rdx);           \
 929         COND_POP(set, CLBR_RCX, rcx);           \
 930         COND_POP(set, CLBR_RAX, rax)
 931
 932 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
 933 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
 934 #define PARA_INDIRECT(addr)     *addr(%rip)
 935 #else
 936 #define PV_SAVE_REGS(set)                       \
 937         COND_PUSH(set, CLBR_EAX, eax);          \
 938         COND_PUSH(set, CLBR_EDI, edi);          \
 939         COND_PUSH(set, CLBR_ECX, ecx);          \
 940         COND_PUSH(set, CLBR_EDX, edx)
 941 #define PV_RESTORE_REGS(set)                    \
 942         COND_POP(set, CLBR_EDX, edx);           \
 943         COND_POP(set, CLBR_ECX, ecx);           \
 944         COND_POP(set, CLBR_EDI, edi);           \
 945         COND_POP(set, CLBR_EAX, eax)
 946
 947 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
 948 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
 949 #define PARA_INDIRECT(addr)     *%cs:addr
 950 #endif
 951
 952 #define INTERRUPT_RETURN                                                \
 953         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
 954                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
 955
 956 #define DISABLE_INTERRUPTS(clobbers)                                    \
 957         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
 958                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 959                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
 960                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 961
 962 #define ENABLE_INTERRUPTS(clobbers)                                     \
 963         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
 964                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 965                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
 966                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 967
 968 #define USERGS_SYSRET32                                                 \
 969         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret32),       \
 970                   CLBR_NONE,                                            \
 971                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret32))
 972
 973 #ifdef CONFIG_X86_32
 974 #define GET_CR0_INTO_EAX                                \
 975         push %ecx; push %edx;                           \
 976         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
 977         pop %edx; pop %ecx
 978
 979 #define ENABLE_INTERRUPTS_SYSEXIT                                       \
 980         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
 981                   CLBR_NONE,                                            \
 982                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
 983
 984
 985 #else   /* !CONFIG_X86_32 */
 986
 987 /*
 988  * If swapgs is used while the userspace stack is still current,
 989  * there's no way to call a pvop.  The PV replacement *must* be
 990  * inlined, or the swapgs instruction must be trapped and emulated.
 991  */
 992 #define SWAPGS_UNSAFE_STACK                                             \
 993         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 994                   swapgs)
 995
 996 /*
 997  * Note: swapgs is very special, and in practise is either going to be
 998  * implemented with a single "swapgs" instruction or something very
 999  * special.  Either way, we don't need to save any registers for
1000  * it.
1001  */
1002 #define SWAPGS                                                          \
1003         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
1004                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
1005                  )
1006
1007 #define GET_CR2_INTO_RCX                                \
1008         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2); \
1009         movq %rax, %rcx;                                \
1010         xorq %rax, %rax;
1011
1012 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
1013         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
1014                   CLBR_NONE,                                            \
1015                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
1016
1017 #define USERGS_SYSRET64                                                 \
1018         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
1019                   CLBR_NONE,                                            \
1020                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
1021
1022 #define ENABLE_INTERRUPTS_SYSEXIT32                                     \
1023         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
1024                   CLBR_NONE,                                            \
1025                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
1026 #endif  /* CONFIG_X86_32 */
1027
1028 #endif /* __ASSEMBLY__ */
1029 #else  /* CONFIG_PARAVIRT */
1030 # define default_banner x86_init_noop
1031 #endif /* !CONFIG_PARAVIRT */
1032 #endif /* _ASM_X86_PARAVIRT_H */