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 /* Bitmask of what can be clobbered: usually at least eax. */
  11 #define CLBR_NONE 0
  12 #define CLBR_EAX  (1 << 0)
  13 #define CLBR_ECX  (1 << 1)
  14 #define CLBR_EDX  (1 << 2)
  15 #define CLBR_EDI  (1 << 3)
  16
  17 #ifdef CONFIG_X86_32
  18 /* CLBR_ANY should match all regs platform has. For i386, that's just it */
  19 #define CLBR_ANY  ((1 << 4) - 1)
  20
  21 #define CLBR_ARG_REGS   (CLBR_EAX | CLBR_EDX | CLBR_ECX)
  22 #define CLBR_RET_REG    (CLBR_EAX | CLBR_EDX)
  23 #define CLBR_SCRATCH    (0)
  24 #else
  25 #define CLBR_RAX  CLBR_EAX
  26 #define CLBR_RCX  CLBR_ECX
  27 #define CLBR_RDX  CLBR_EDX
  28 #define CLBR_RDI  CLBR_EDI
  29 #define CLBR_RSI  (1 << 4)
  30 #define CLBR_R8   (1 << 5)
  31 #define CLBR_R9   (1 << 6)
  32 #define CLBR_R10  (1 << 7)
  33 #define CLBR_R11  (1 << 8)
  34
  35 #define CLBR_ANY  ((1 << 9) - 1)
  36
  37 #define CLBR_ARG_REGS   (CLBR_RDI | CLBR_RSI | CLBR_RDX | \
  38                          CLBR_RCX | CLBR_R8 | CLBR_R9)
  39 #define CLBR_RET_REG    (CLBR_RAX)
  40 #define CLBR_SCRATCH    (CLBR_R10 | CLBR_R11)
  41
  42 #include <asm/desc_defs.h>
  43 #endif /* X86_64 */
  44
  45 #define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
  46
  47 #ifndef __ASSEMBLY__
  48 #include <linux/types.h>
  49 #include <linux/cpumask.h>
  50 #include <asm/kmap_types.h>
  51 #include <asm/desc_defs.h>
  52
  53 struct page;
  54 struct thread_struct;
  55 struct desc_ptr;
  56 struct tss_struct;
  57 struct mm_struct;
  58 struct desc_struct;
  59 struct task_struct;
  60
  61 /*
  62  * Wrapper type for pointers to code which uses the non-standard
  63  * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
  64  */
  65 struct paravirt_callee_save {
  66         void *func;
  67 };
  68
  69 /* general info */
  70 struct pv_info {
  71         unsigned int kernel_rpl;
  72         int shared_kernel_pmd;
  73         int paravirt_enabled;
  74         const char *name;
  75 };
  76
  77 struct pv_init_ops {
  78         /*
  79          * Patch may replace one of the defined code sequences with
  80          * arbitrary code, subject to the same register constraints.
  81          * This generally means the code is not free to clobber any
  82          * registers other than EAX.  The patch function should return
  83          * the number of bytes of code generated, as we nop pad the
  84          * rest in generic code.
  85          */
  86         unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
  87                           unsigned long addr, unsigned len);
  88
  89         /* Basic arch-specific setup */
  90         void (*arch_setup)(void);
  91         char *(*memory_setup)(void);
  92         void (*post_allocator_init)(void);
  93
  94         /* Print a banner to identify the environment */
  95         void (*banner)(void);
  96 };
  97
  98
  99 struct pv_lazy_ops {
 100         /* Set deferred update mode, used for batching operations. */
 101         void (*enter)(void);
 102         void (*leave)(void);
 103 };
 104
 105 struct pv_time_ops {
 106         void (*time_init)(void);
 107
 108         /* Set and set time of day */
 109         unsigned long (*get_wallclock)(void);
 110         int (*set_wallclock)(unsigned long);
 111
 112         unsigned long long (*sched_clock)(void);
 113         unsigned long (*get_tsc_khz)(void);
 114 };
 115
 116 struct pv_cpu_ops {
 117         /* hooks for various privileged instructions */
 118         unsigned long (*get_debugreg)(int regno);
 119         void (*set_debugreg)(int regno, unsigned long value);
 120
 121         void (*clts)(void);
 122
 123         unsigned long (*read_cr0)(void);
 124         void (*write_cr0)(unsigned long);
 125
 126         unsigned long (*read_cr4_safe)(void);
 127         unsigned long (*read_cr4)(void);
 128         void (*write_cr4)(unsigned long);
 129
 130 #ifdef CONFIG_X86_64
 131         unsigned long (*read_cr8)(void);
 132         void (*write_cr8)(unsigned long);
 133 #endif
 134
 135         /* Segment descriptor handling */
 136         void (*load_tr_desc)(void);
 137         void (*load_gdt)(const struct desc_ptr *);
 138         void (*load_idt)(const struct desc_ptr *);
 139         void (*store_gdt)(struct desc_ptr *);
 140         void (*store_idt)(struct desc_ptr *);
 141         void (*set_ldt)(const void *desc, unsigned entries);
 142         unsigned long (*store_tr)(void);
 143         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
 144 #ifdef CONFIG_X86_64
 145         void (*load_gs_index)(unsigned int idx);
 146 #endif
 147         void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
 148                                 const void *desc);
 149         void (*write_gdt_entry)(struct desc_struct *,
 150                                 int entrynum, const void *desc, int size);
 151         void (*write_idt_entry)(gate_desc *,
 152                                 int entrynum, const gate_desc *gate);
 153         void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
 154         void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
 155
 156         void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
 157
 158         void (*set_iopl_mask)(unsigned mask);
 159
 160         void (*wbinvd)(void);
 161         void (*io_delay)(void);
 162
 163         /* cpuid emulation, mostly so that caps bits can be disabled */
 164         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
 165                       unsigned int *ecx, unsigned int *edx);
 166
 167         /* MSR, PMC and TSR operations.
 168            err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
 169         u64 (*read_msr_amd)(unsigned int msr, int *err);
 170         u64 (*read_msr)(unsigned int msr, int *err);
 171         int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
 172
 173         u64 (*read_tsc)(void);
 174         u64 (*read_pmc)(int counter);
 175         unsigned long long (*read_tscp)(unsigned int *aux);
 176
 177         /*
 178          * Atomically enable interrupts and return to userspace.  This
 179          * is only ever used to return to 32-bit processes; in a
 180          * 64-bit kernel, it's used for 32-on-64 compat processes, but
 181          * never native 64-bit processes.  (Jump, not call.)
 182          */
 183         void (*irq_enable_sysexit)(void);
 184
 185         /*
 186          * Switch to usermode gs and return to 64-bit usermode using
 187          * sysret.  Only used in 64-bit kernels to return to 64-bit
 188          * processes.  Usermode register state, including %rsp, must
 189          * already be restored.
 190          */
 191         void (*usergs_sysret64)(void);
 192
 193         /*
 194          * Switch to usermode gs and return to 32-bit usermode using
 195          * sysret.  Used to return to 32-on-64 compat processes.
 196          * Other usermode register state, including %esp, must already
 197          * be restored.
 198          */
 199         void (*usergs_sysret32)(void);
 200
 201         /* Normal iret.  Jump to this with the standard iret stack
 202            frame set up. */
 203         void (*iret)(void);
 204
 205         void (*swapgs)(void);
 206
 207         void (*start_context_switch)(struct task_struct *prev);
 208         void (*end_context_switch)(struct task_struct *next);
 209 };
 210
 211 struct pv_irq_ops {
 212         void (*init_IRQ)(void);
 213
 214         /*
 215          * Get/set interrupt state.  save_fl and restore_fl are only
 216          * expected to use X86_EFLAGS_IF; all other bits
 217          * returned from save_fl are undefined, and may be ignored by
 218          * restore_fl.
 219          *
 220          * NOTE: These functions callers expect the callee to preserve
 221          * more registers than the standard C calling convention.
 222          */
 223         struct paravirt_callee_save save_fl;
 224         struct paravirt_callee_save restore_fl;
 225         struct paravirt_callee_save irq_disable;
 226         struct paravirt_callee_save irq_enable;
 227
 228         void (*safe_halt)(void);
 229         void (*halt)(void);
 230
 231 #ifdef CONFIG_X86_64
 232         void (*adjust_exception_frame)(void);
 233 #endif
 234 };
 235
 236 struct pv_apic_ops {
 237 #ifdef CONFIG_X86_LOCAL_APIC
 238         void (*setup_boot_clock)(void);
 239         void (*setup_secondary_clock)(void);
 240
 241         void (*startup_ipi_hook)(int phys_apicid,
 242                                  unsigned long start_eip,
 243                                  unsigned long start_esp);
 244 #endif
 245 };
 246
 247 struct pv_mmu_ops {
 248         /*
 249          * Called before/after init_mm pagetable setup. setup_start
 250          * may reset %cr3, and may pre-install parts of the pagetable;
 251          * pagetable setup is expected to preserve any existing
 252          * mapping.
 253          */
 254         void (*pagetable_setup_start)(pgd_t *pgd_base);
 255         void (*pagetable_setup_done)(pgd_t *pgd_base);
 256
 257         unsigned long (*read_cr2)(void);
 258         void (*write_cr2)(unsigned long);
 259
 260         unsigned long (*read_cr3)(void);
 261         void (*write_cr3)(unsigned long);
 262
 263         /*
 264          * Hooks for intercepting the creation/use/destruction of an
 265          * mm_struct.
 266          */
 267         void (*activate_mm)(struct mm_struct *prev,
 268                             struct mm_struct *next);
 269         void (*dup_mmap)(struct mm_struct *oldmm,
 270                          struct mm_struct *mm);
 271         void (*exit_mmap)(struct mm_struct *mm);
 272
 273
 274         /* TLB operations */
 275         void (*flush_tlb_user)(void);
 276         void (*flush_tlb_kernel)(void);
 277         void (*flush_tlb_single)(unsigned long addr);
 278         void (*flush_tlb_others)(const struct cpumask *cpus,
 279                                  struct mm_struct *mm,
 280                                  unsigned long va);
 281
 282         /* Hooks for allocating and freeing a pagetable top-level */
 283         int  (*pgd_alloc)(struct mm_struct *mm);
 284         void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
 285
 286         /*
 287          * Hooks for allocating/releasing pagetable pages when they're
 288          * attached to a pagetable
 289          */
 290         void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
 291         void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
 292         void (*alloc_pmd_clone)(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count);
 293         void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
 294         void (*release_pte)(unsigned long pfn);
 295         void (*release_pmd)(unsigned long pfn);
 296         void (*release_pud)(unsigned long pfn);
 297
 298         /* Pagetable manipulation functions */
 299         void (*set_pte)(pte_t *ptep, pte_t pteval);
 300         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
 301                            pte_t *ptep, pte_t pteval);
 302         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
 303         void (*pte_update)(struct mm_struct *mm, unsigned long addr,
 304                            pte_t *ptep);
 305         void (*pte_update_defer)(struct mm_struct *mm,
 306                                  unsigned long addr, pte_t *ptep);
 307
 308         pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
 309                                         pte_t *ptep);
 310         void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
 311                                         pte_t *ptep, pte_t pte);
 312
 313         struct paravirt_callee_save pte_val;
 314         struct paravirt_callee_save make_pte;
 315
 316         struct paravirt_callee_save pgd_val;
 317         struct paravirt_callee_save make_pgd;
 318
 319 #if PAGETABLE_LEVELS >= 3
 320 #ifdef CONFIG_X86_PAE
 321         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
 322         void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
 323                           pte_t *ptep);
 324         void (*pmd_clear)(pmd_t *pmdp);
 325
 326 #endif  /* CONFIG_X86_PAE */
 327
 328         void (*set_pud)(pud_t *pudp, pud_t pudval);
 329
 330         struct paravirt_callee_save pmd_val;
 331         struct paravirt_callee_save make_pmd;
 332
 333 #if PAGETABLE_LEVELS == 4
 334         struct paravirt_callee_save pud_val;
 335         struct paravirt_callee_save make_pud;
 336
 337         void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
 338 #endif  /* PAGETABLE_LEVELS == 4 */
 339 #endif  /* PAGETABLE_LEVELS >= 3 */
 340
 341 #ifdef CONFIG_HIGHPTE
 342         void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
 343 #endif
 344
 345         struct pv_lazy_ops lazy_mode;
 346
 347         /* dom0 ops */
 348
 349         /* Sometimes the physical address is a pfn, and sometimes its
 350            an mfn.  We can tell which is which from the index. */
 351         void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
 352                            phys_addr_t phys, pgprot_t flags);
 353 };
 354
 355 struct raw_spinlock;
 356 struct pv_lock_ops {
 357         int (*spin_is_locked)(struct raw_spinlock *lock);
 358         int (*spin_is_contended)(struct raw_spinlock *lock);
 359         void (*spin_lock)(struct raw_spinlock *lock);
 360         void (*spin_lock_flags)(struct raw_spinlock *lock, unsigned long flags);
 361         int (*spin_trylock)(struct raw_spinlock *lock);
 362         void (*spin_unlock)(struct raw_spinlock *lock);
 363 };
 364
 365 /* This contains all the paravirt structures: we get a convenient
 366  * number for each function using the offset which we use to indicate
 367  * what to patch. */
 368 struct paravirt_patch_template {
 369         struct pv_init_ops pv_init_ops;
 370         struct pv_time_ops pv_time_ops;
 371         struct pv_cpu_ops pv_cpu_ops;
 372         struct pv_irq_ops pv_irq_ops;
 373         struct pv_apic_ops pv_apic_ops;
 374         struct pv_mmu_ops pv_mmu_ops;
 375         struct pv_lock_ops pv_lock_ops;
 376 };
 377
 378 extern struct pv_info pv_info;
 379 extern struct pv_init_ops pv_init_ops;
 380 extern struct pv_time_ops pv_time_ops;
 381 extern struct pv_cpu_ops pv_cpu_ops;
 382 extern struct pv_irq_ops pv_irq_ops;
 383 extern struct pv_apic_ops pv_apic_ops;
 384 extern struct pv_mmu_ops pv_mmu_ops;
 385 extern struct pv_lock_ops pv_lock_ops;
 386
 387 #define PARAVIRT_PATCH(x)                                       \
 388         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
 389
 390 #define paravirt_type(op)                               \
 391         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
 392         [paravirt_opptr] "i" (&(op))
 393 #define paravirt_clobber(clobber)               \
 394         [paravirt_clobber] "i" (clobber)
 395
 396 /*
 397  * Generate some code, and mark it as patchable by the
 398  * apply_paravirt() alternate instruction patcher.
 399  */
 400 #define _paravirt_alt(insn_string, type, clobber)       \
 401         "771:\n\t" insn_string "\n" "772:\n"            \
 402         ".pushsection .parainstructions,\"a\"\n"        \
 403         _ASM_ALIGN "\n"                                 \
 404         _ASM_PTR " 771b\n"                              \
 405         "  .byte " type "\n"                            \
 406         "  .byte 772b-771b\n"                           \
 407         "  .short " clobber "\n"                        \
 408         ".popsection\n"
 409
 410 /* Generate patchable code, with the default asm parameters. */
 411 #define paravirt_alt(insn_string)                                       \
 412         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
 413
 414 /* Simple instruction patching code. */
 415 #define DEF_NATIVE(ops, name, code)                                     \
 416         extern const char start_##ops##_##name[], end_##ops##_##name[]; \
 417         asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
 418
 419 unsigned paravirt_patch_nop(void);
 420 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
 421 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
 422 unsigned paravirt_patch_ignore(unsigned len);
 423 unsigned paravirt_patch_call(void *insnbuf,
 424                              const void *target, u16 tgt_clobbers,
 425                              unsigned long addr, u16 site_clobbers,
 426                              unsigned len);
 427 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
 428                             unsigned long addr, unsigned len);
 429 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
 430                                 unsigned long addr, unsigned len);
 431
 432 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
 433                               const char *start, const char *end);
 434
 435 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
 436                       unsigned long addr, unsigned len);
 437
 438 int paravirt_disable_iospace(void);
 439
 440 /*
 441  * This generates an indirect call based on the operation type number.
 442  * The type number, computed in PARAVIRT_PATCH, is derived from the
 443  * offset into the paravirt_patch_template structure, and can therefore be
 444  * freely converted back into a structure offset.
 445  */
 446 #define PARAVIRT_CALL   "call *%c[paravirt_opptr];"
 447
 448 /*
 449  * These macros are intended to wrap calls through one of the paravirt
 450  * ops structs, so that they can be later identified and patched at
 451  * runtime.
 452  *
 453  * Normally, a call to a pv_op function is a simple indirect call:
 454  * (pv_op_struct.operations)(args...).
 455  *
 456  * Unfortunately, this is a relatively slow operation for modern CPUs,
 457  * because it cannot necessarily determine what the destination
 458  * address is.  In this case, the address is a runtime constant, so at
 459  * the very least we can patch the call to e a simple direct call, or
 460  * ideally, patch an inline implementation into the callsite.  (Direct
 461  * calls are essentially free, because the call and return addresses
 462  * are completely predictable.)
 463  *
 464  * For i386, these macros rely on the standard gcc "regparm(3)" calling
 465  * convention, in which the first three arguments are placed in %eax,
 466  * %edx, %ecx (in that order), and the remaining arguments are placed
 467  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
 468  * to be modified (either clobbered or used for return values).
 469  * X86_64, on the other hand, already specifies a register-based calling
 470  * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
 471  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
 472  * special handling for dealing with 4 arguments, unlike i386.
 473  * However, x86_64 also have to clobber all caller saved registers, which
 474  * unfortunately, are quite a bit (r8 - r11)
 475  *
 476  * The call instruction itself is marked by placing its start address
 477  * and size into the .parainstructions section, so that
 478  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
 479  * appropriate patching under the control of the backend pv_init_ops
 480  * implementation.
 481  *
 482  * Unfortunately there's no way to get gcc to generate the args setup
 483  * for the call, and then allow the call itself to be generated by an
 484  * inline asm.  Because of this, we must do the complete arg setup and
 485  * return value handling from within these macros.  This is fairly
 486  * cumbersome.
 487  *
 488  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
 489  * It could be extended to more arguments, but there would be little
 490  * to be gained from that.  For each number of arguments, there are
 491  * the two VCALL and CALL variants for void and non-void functions.
 492  *
 493  * When there is a return value, the invoker of the macro must specify
 494  * the return type.  The macro then uses sizeof() on that type to
 495  * determine whether its a 32 or 64 bit value, and places the return
 496  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
 497  * 64-bit). For x86_64 machines, it just returns at %rax regardless of
 498  * the return value size.
 499  *
 500  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
 501  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
 502  * in low,high order
 503  *
 504  * Small structures are passed and returned in registers.  The macro
 505  * calling convention can't directly deal with this, so the wrapper
 506  * functions must do this.
 507  *
 508  * These PVOP_* macros are only defined within this header.  This
 509  * means that all uses must be wrapped in inline functions.  This also
 510  * makes sure the incoming and outgoing types are always correct.
 511  */
 512 #ifdef CONFIG_X86_32
 513 #define PVOP_VCALL_ARGS                         \
 514         unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
 515 #define PVOP_CALL_ARGS                  PVOP_VCALL_ARGS
 516
 517 #define PVOP_CALL_ARG1(x)               "a" ((unsigned long)(x))
 518 #define PVOP_CALL_ARG2(x)               "d" ((unsigned long)(x))
 519 #define PVOP_CALL_ARG3(x)               "c" ((unsigned long)(x))
 520
 521 #define PVOP_VCALL_CLOBBERS             "=a" (__eax), "=d" (__edx),     \
 522                                         "=c" (__ecx)
 523 #define PVOP_CALL_CLOBBERS              PVOP_VCALL_CLOBBERS
 524
 525 #define PVOP_VCALLEE_CLOBBERS           "=a" (__eax), "=d" (__edx)
 526 #define PVOP_CALLEE_CLOBBERS            PVOP_VCALLEE_CLOBBERS
 527
 528 #define EXTRA_CLOBBERS
 529 #define VEXTRA_CLOBBERS
 530 #else  /* CONFIG_X86_64 */
 531 #define PVOP_VCALL_ARGS                                 \
 532         unsigned long __edi = __edi, __esi = __esi,     \
 533                 __edx = __edx, __ecx = __ecx
 534 #define PVOP_CALL_ARGS          PVOP_VCALL_ARGS, __eax
 535
 536 #define PVOP_CALL_ARG1(x)               "D" ((unsigned long)(x))
 537 #define PVOP_CALL_ARG2(x)               "S" ((unsigned long)(x))
 538 #define PVOP_CALL_ARG3(x)               "d" ((unsigned long)(x))
 539 #define PVOP_CALL_ARG4(x)               "c" ((unsigned long)(x))
 540
 541 #define PVOP_VCALL_CLOBBERS     "=D" (__edi),                           \
 542                                 "=S" (__esi), "=d" (__edx),             \
 543                                 "=c" (__ecx)
 544 #define PVOP_CALL_CLOBBERS      PVOP_VCALL_CLOBBERS, "=a" (__eax)
 545
 546 #define PVOP_VCALLEE_CLOBBERS   "=a" (__eax)
 547 #define PVOP_CALLEE_CLOBBERS    PVOP_VCALLEE_CLOBBERS
 548
 549 #define EXTRA_CLOBBERS   , "r8", "r9", "r10", "r11"
 550 #define VEXTRA_CLOBBERS  , "rax", "r8", "r9", "r10", "r11"
 551 #endif  /* CONFIG_X86_32 */
 552
 553 #ifdef CONFIG_PARAVIRT_DEBUG
 554 #define PVOP_TEST_NULL(op)      BUG_ON(op == NULL)
 555 #else
 556 #define PVOP_TEST_NULL(op)      ((void)op)
 557 #endif
 558
 559 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,         \
 560                       pre, post, ...)                                   \
 561         ({                                                              \
 562                 rettype __ret;                                          \
 563                 PVOP_CALL_ARGS;                                         \
 564                 PVOP_TEST_NULL(op);                                     \
 565                 /* This is 32-bit specific, but is okay in 64-bit */    \
 566                 /* since this condition will never hold */              \
 567                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
 568                         asm volatile(pre                                \
 569                                      paravirt_alt(PARAVIRT_CALL)        \
 570                                      post                               \
 571                                      : call_clbr                        \
 572                                      : paravirt_type(op),               \
 573                                        paravirt_clobber(clbr),          \
 574                                        ##__VA_ARGS__                    \
 575                                      : "memory", "cc" extra_clbr);      \
 576                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
 577                 } else {                                                \
 578                         asm volatile(pre                                \
 579                                      paravirt_alt(PARAVIRT_CALL)        \
 580                                      post                               \
 581                                      : call_clbr                        \
 582                                      : paravirt_type(op),               \
 583                                        paravirt_clobber(clbr),          \
 584                                        ##__VA_ARGS__                    \
 585                                      : "memory", "cc" extra_clbr);      \
 586                         __ret = (rettype)__eax;                         \
 587                 }                                                       \
 588                 __ret;                                                  \
 589         })
 590
 591 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
 592         ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,        \
 593                       EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
 594
 595 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)                  \
 596         ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
 597                       PVOP_CALLEE_CLOBBERS, ,                           \
 598                       pre, post, ##__VA_ARGS__)
 599
 600
 601 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
 602         ({                                                              \
 603                 PVOP_VCALL_ARGS;                                        \
 604                 PVOP_TEST_NULL(op);                                     \
 605                 asm volatile(pre                                        \
 606                              paravirt_alt(PARAVIRT_CALL)                \
 607                              post                                       \
 608                              : call_clbr                                \
 609                              : paravirt_type(op),                       \
 610                                paravirt_clobber(clbr),                  \
 611                                ##__VA_ARGS__                            \
 612                              : "memory", "cc" extra_clbr);              \
 613         })
 614
 615 #define __PVOP_VCALL(op, pre, post, ...)                                \
 616         ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,               \
 617                        VEXTRA_CLOBBERS,                                 \
 618                        pre, post, ##__VA_ARGS__)
 619
 620 #define __PVOP_VCALLEESAVE(rettype, op, pre, post, ...)                 \
 621         ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
 622                       PVOP_VCALLEE_CLOBBERS, ,                          \
 623                       pre, post, ##__VA_ARGS__)
 624
 625
 626
 627 #define PVOP_CALL0(rettype, op)                                         \
 628         __PVOP_CALL(rettype, op, "", "")
 629 #define PVOP_VCALL0(op)                                                 \
 630         __PVOP_VCALL(op, "", "")
 631
 632 #define PVOP_CALLEE0(rettype, op)                                       \
 633         __PVOP_CALLEESAVE(rettype, op, "", "")
 634 #define PVOP_VCALLEE0(op)                                               \
 635         __PVOP_VCALLEESAVE(op, "", "")
 636
 637
 638 #define PVOP_CALL1(rettype, op, arg1)                                   \
 639         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 640 #define PVOP_VCALL1(op, arg1)                                           \
 641         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
 642
 643 #define PVOP_CALLEE1(rettype, op, arg1)                                 \
 644         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 645 #define PVOP_VCALLEE1(op, arg1)                                         \
 646         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
 647
 648
 649 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
 650         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 651                     PVOP_CALL_ARG2(arg2))
 652 #define PVOP_VCALL2(op, arg1, arg2)                                     \
 653         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 654                      PVOP_CALL_ARG2(arg2))
 655
 656 #define PVOP_CALLEE2(rettype, op, arg1, arg2)                           \
 657         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),    \
 658                           PVOP_CALL_ARG2(arg2))
 659 #define PVOP_VCALLEE2(op, arg1, arg2)                                   \
 660         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),            \
 661                            PVOP_CALL_ARG2(arg2))
 662
 663
 664 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
 665         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 666                     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 667 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
 668         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 669                      PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 670
 671 /* This is the only difference in x86_64. We can make it much simpler */
 672 #ifdef CONFIG_X86_32
 673 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 674         __PVOP_CALL(rettype, op,                                        \
 675                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 676                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 677                     PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
 678 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 679         __PVOP_VCALL(op,                                                \
 680                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 681                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
 682                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
 683 #else
 684 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 685         __PVOP_CALL(rettype, op, "", "",                                \
 686                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 687                     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 688 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 689         __PVOP_VCALL(op, "", "",                                        \
 690                      PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),        \
 691                      PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 692 #endif
 693
 694 static inline int paravirt_enabled(void)
 695 {
 696         return pv_info.paravirt_enabled;
 697 }
 698
 699 static inline void load_sp0(struct tss_struct *tss,
 700                              struct thread_struct *thread)
 701 {
 702         PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
 703 }
 704
 705 #define ARCH_SETUP                      pv_init_ops.arch_setup();
 706 static inline unsigned long get_wallclock(void)
 707 {
 708         return PVOP_CALL0(unsigned long, pv_time_ops.get_wallclock);
 709 }
 710
 711 static inline int set_wallclock(unsigned long nowtime)
 712 {
 713         return PVOP_CALL1(int, pv_time_ops.set_wallclock, nowtime);
 714 }
 715
 716 static inline void (*choose_time_init(void))(void)
 717 {
 718         return pv_time_ops.time_init;
 719 }
 720
 721 /* The paravirtualized CPUID instruction. */
 722 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
 723                            unsigned int *ecx, unsigned int *edx)
 724 {
 725         PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
 726 }
 727
 728 /*
 729  * These special macros can be used to get or set a debugging register
 730  */
 731 static inline unsigned long paravirt_get_debugreg(int reg)
 732 {
 733         return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
 734 }
 735 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
 736 static inline void set_debugreg(unsigned long val, int reg)
 737 {
 738         PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
 739 }
 740
 741 static inline void clts(void)
 742 {
 743         PVOP_VCALL0(pv_cpu_ops.clts);
 744 }
 745
 746 static inline unsigned long read_cr0(void)
 747 {
 748         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
 749 }
 750
 751 static inline void write_cr0(unsigned long x)
 752 {
 753         PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
 754 }
 755
 756 static inline unsigned long read_cr2(void)
 757 {
 758         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
 759 }
 760
 761 static inline void write_cr2(unsigned long x)
 762 {
 763         PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
 764 }
 765
 766 static inline unsigned long read_cr3(void)
 767 {
 768         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
 769 }
 770
 771 static inline void write_cr3(unsigned long x)
 772 {
 773         PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
 774 }
 775
 776 static inline unsigned long read_cr4(void)
 777 {
 778         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
 779 }
 780 static inline unsigned long read_cr4_safe(void)
 781 {
 782         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
 783 }
 784
 785 static inline void write_cr4(unsigned long x)
 786 {
 787         PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
 788 }
 789
 790 #ifdef CONFIG_X86_64
 791 static inline unsigned long read_cr8(void)
 792 {
 793         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
 794 }
 795
 796 static inline void write_cr8(unsigned long x)
 797 {
 798         PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
 799 }
 800 #endif
 801
 802 static inline void raw_safe_halt(void)
 803 {
 804         PVOP_VCALL0(pv_irq_ops.safe_halt);
 805 }
 806
 807 static inline void halt(void)
 808 {
 809         PVOP_VCALL0(pv_irq_ops.safe_halt);
 810 }
 811
 812 static inline void wbinvd(void)
 813 {
 814         PVOP_VCALL0(pv_cpu_ops.wbinvd);
 815 }
 816
 817 #define get_kernel_rpl()  (pv_info.kernel_rpl)
 818
 819 static inline u64 paravirt_read_msr(unsigned msr, int *err)
 820 {
 821         return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
 822 }
 823 static inline u64 paravirt_read_msr_amd(unsigned msr, int *err)
 824 {
 825         return PVOP_CALL2(u64, pv_cpu_ops.read_msr_amd, msr, err);
 826 }
 827 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
 828 {
 829         return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
 830 }
 831
 832 /* These should all do BUG_ON(_err), but our headers are too tangled. */
 833 #define rdmsr(msr, val1, val2)                  \
 834 do {                                            \
 835         int _err;                               \
 836         u64 _l = paravirt_read_msr(msr, &_err); \
 837         val1 = (u32)_l;                         \
 838         val2 = _l >> 32;                        \
 839 } while (0)
 840
 841 #define wrmsr(msr, val1, val2)                  \
 842 do {                                            \
 843         paravirt_write_msr(msr, val1, val2);    \
 844 } while (0)
 845
 846 #define rdmsrl(msr, val)                        \
 847 do {                                            \
 848         int _err;                               \
 849         val = paravirt_read_msr(msr, &_err);    \
 850 } while (0)
 851
 852 #define wrmsrl(msr, val)        wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
 853 #define wrmsr_safe(msr, a, b)   paravirt_write_msr(msr, a, b)
 854
 855 /* rdmsr with exception handling */
 856 #define rdmsr_safe(msr, a, b)                   \
 857 ({                                              \
 858         int _err;                               \
 859         u64 _l = paravirt_read_msr(msr, &_err); \
 860         (*a) = (u32)_l;                         \
 861         (*b) = _l >> 32;                        \
 862         _err;                                   \
 863 })
 864
 865 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
 866 {
 867         int err;
 868
 869         *p = paravirt_read_msr(msr, &err);
 870         return err;
 871 }
 872 static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
 873 {
 874         int err;
 875
 876         *p = paravirt_read_msr_amd(msr, &err);
 877         return err;
 878 }
 879
 880 static inline u64 paravirt_read_tsc(void)
 881 {
 882         return PVOP_CALL0(u64, pv_cpu_ops.read_tsc);
 883 }
 884
 885 #define rdtscl(low)                             \
 886 do {                                            \
 887         u64 _l = paravirt_read_tsc();           \
 888         low = (int)_l;                          \
 889 } while (0)
 890
 891 #define rdtscll(val) (val = paravirt_read_tsc())
 892
 893 static inline unsigned long long paravirt_sched_clock(void)
 894 {
 895         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
 896 }
 897 #define calibrate_tsc() (pv_time_ops.get_tsc_khz())
 898
 899 static inline unsigned long long paravirt_read_pmc(int counter)
 900 {
 901         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
 902 }
 903
 904 #define rdpmc(counter, low, high)               \
 905 do {                                            \
 906         u64 _l = paravirt_read_pmc(counter);    \
 907         low = (u32)_l;                          \
 908         high = _l >> 32;                        \
 909 } while (0)
 910
 911 static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
 912 {
 913         return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
 914 }
 915
 916 #define rdtscp(low, high, aux)                          \
 917 do {                                                    \
 918         int __aux;                                      \
 919         unsigned long __val = paravirt_rdtscp(&__aux);  \
 920         (low) = (u32)__val;                             \
 921         (high) = (u32)(__val >> 32);                    \
 922         (aux) = __aux;                                  \
 923 } while (0)
 924
 925 #define rdtscpll(val, aux)                              \
 926 do {                                                    \
 927         unsigned long __aux;                            \
 928         val = paravirt_rdtscp(&__aux);                  \
 929         (aux) = __aux;                                  \
 930 } while (0)
 931
 932 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
 933 {
 934         PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
 935 }
 936
 937 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
 938 {
 939         PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
 940 }
 941
 942 static inline void load_TR_desc(void)
 943 {
 944         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
 945 }
 946 static inline void load_gdt(const struct desc_ptr *dtr)
 947 {
 948         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
 949 }
 950 static inline void load_idt(const struct desc_ptr *dtr)
 951 {
 952         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
 953 }
 954 static inline void set_ldt(const void *addr, unsigned entries)
 955 {
 956         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
 957 }
 958 static inline void store_gdt(struct desc_ptr *dtr)
 959 {
 960         PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
 961 }
 962 static inline void store_idt(struct desc_ptr *dtr)
 963 {
 964         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
 965 }
 966 static inline unsigned long paravirt_store_tr(void)
 967 {
 968         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
 969 }
 970 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 971 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 972 {
 973         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
 974 }
 975
 976 #ifdef CONFIG_X86_64
 977 static inline void load_gs_index(unsigned int gs)
 978 {
 979         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
 980 }
 981 #endif
 982
 983 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
 984                                    const void *desc)
 985 {
 986         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
 987 }
 988
 989 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
 990                                    void *desc, int type)
 991 {
 992         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
 993 }
 994
 995 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
 996 {
 997         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
 998 }
 999 static inline void set_iopl_mask(unsigned mask)
1000 {
1001         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
1002 }
1003
1004 /* The paravirtualized I/O functions */
1005 static inline void slow_down_io(void)
1006 {
1007         pv_cpu_ops.io_delay();
1008 #ifdef REALLY_SLOW_IO
1009         pv_cpu_ops.io_delay();
1010         pv_cpu_ops.io_delay();
1011         pv_cpu_ops.io_delay();
1012 #endif
1013 }
1014
1015 #ifdef CONFIG_X86_LOCAL_APIC
1016 static inline void setup_boot_clock(void)
1017 {
1018         PVOP_VCALL0(pv_apic_ops.setup_boot_clock);
1019 }
1020
1021 static inline void setup_secondary_clock(void)
1022 {
1023         PVOP_VCALL0(pv_apic_ops.setup_secondary_clock);
1024 }
1025 #endif
1026
1027 static inline void paravirt_post_allocator_init(void)
1028 {
1029         if (pv_init_ops.post_allocator_init)
1030                 (*pv_init_ops.post_allocator_init)();
1031 }
1032
1033 static inline void paravirt_pagetable_setup_start(pgd_t *base)
1034 {
1035         (*pv_mmu_ops.pagetable_setup_start)(base);
1036 }
1037
1038 static inline void paravirt_pagetable_setup_done(pgd_t *base)
1039 {
1040         (*pv_mmu_ops.pagetable_setup_done)(base);
1041 }
1042
1043 #ifdef CONFIG_SMP
1044 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
1045                                     unsigned long start_esp)
1046 {
1047         PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
1048                     phys_apicid, start_eip, start_esp);
1049 }
1050 #endif
1051
1052 static inline void paravirt_activate_mm(struct mm_struct *prev,
1053                                         struct mm_struct *next)
1054 {
1055         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
1056 }
1057
1058 static inline void arch_dup_mmap(struct mm_struct *oldmm,
1059                                  struct mm_struct *mm)
1060 {
1061         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
1062 }
1063
1064 static inline void arch_exit_mmap(struct mm_struct *mm)
1065 {
1066         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
1067 }
1068
1069 static inline void __flush_tlb(void)
1070 {
1071         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
1072 }
1073 static inline void __flush_tlb_global(void)
1074 {
1075         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
1076 }
1077 static inline void __flush_tlb_single(unsigned long addr)
1078 {
1079         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
1080 }
1081
1082 static inline void flush_tlb_others(const struct cpumask *cpumask,
1083                                     struct mm_struct *mm,
1084                                     unsigned long va)
1085 {
1086         PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, cpumask, mm, va);
1087 }
1088
1089 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
1090 {
1091         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
1092 }
1093
1094 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
1095 {
1096         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
1097 }
1098
1099 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
1100 {
1101         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
1102 }
1103 static inline void paravirt_release_pte(unsigned long pfn)
1104 {
1105         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
1106 }
1107
1108 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
1109 {
1110         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
1111 }
1112
1113 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
1114                                             unsigned long start, unsigned long count)
1115 {
1116         PVOP_VCALL4(pv_mmu_ops.alloc_pmd_clone, pfn, clonepfn, start, count);
1117 }
1118 static inline void paravirt_release_pmd(unsigned long pfn)
1119 {
1120         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
1121 }
1122
1123 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
1124 {
1125         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
1126 }
1127 static inline void paravirt_release_pud(unsigned long pfn)
1128 {
1129         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
1130 }
1131
1132 #ifdef CONFIG_HIGHPTE
1133 static inline void *kmap_atomic_pte(struct page *page, enum km_type type)
1134 {
1135         unsigned long ret;
1136         ret = PVOP_CALL2(unsigned long, pv_mmu_ops.kmap_atomic_pte, page, type);
1137         return (void *)ret;
1138 }
1139 #endif
1140
1141 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
1142                               pte_t *ptep)
1143 {
1144         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
1145 }
1146
1147 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
1148                                     pte_t *ptep)
1149 {
1150         PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
1151 }
1152
1153 static inline pte_t __pte(pteval_t val)
1154 {
1155         pteval_t ret;
1156
1157         if (sizeof(pteval_t) > sizeof(long))
1158                 ret = PVOP_CALLEE2(pteval_t,
1159                                    pv_mmu_ops.make_pte,
1160                                    val, (u64)val >> 32);
1161         else
1162                 ret = PVOP_CALLEE1(pteval_t,
1163                                    pv_mmu_ops.make_pte,
1164                                    val);
1165
1166         return (pte_t) { .pte = ret };
1167 }
1168
1169 static inline pteval_t pte_val(pte_t pte)
1170 {
1171         pteval_t ret;
1172
1173         if (sizeof(pteval_t) > sizeof(long))
1174                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
1175                                    pte.pte, (u64)pte.pte >> 32);
1176         else
1177                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
1178                                    pte.pte);
1179
1180         return ret;
1181 }
1182
1183 static inline pgd_t __pgd(pgdval_t val)
1184 {
1185         pgdval_t ret;
1186
1187         if (sizeof(pgdval_t) > sizeof(long))
1188                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
1189                                    val, (u64)val >> 32);
1190         else
1191                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
1192                                    val);
1193
1194         return (pgd_t) { ret };
1195 }
1196
1197 static inline pgdval_t pgd_val(pgd_t pgd)
1198 {
1199         pgdval_t ret;
1200
1201         if (sizeof(pgdval_t) > sizeof(long))
1202                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
1203                                     pgd.pgd, (u64)pgd.pgd >> 32);
1204         else
1205                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
1206                                     pgd.pgd);
1207
1208         return ret;
1209 }
1210
1211 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
1212 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
1213                                            pte_t *ptep)
1214 {
1215         pteval_t ret;
1216
1217         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
1218                          mm, addr, ptep);
1219
1220         return (pte_t) { .pte = ret };
1221 }
1222
1223 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
1224                                            pte_t *ptep, pte_t pte)
1225 {
1226         if (sizeof(pteval_t) > sizeof(long))
1227                 /* 5 arg words */
1228                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
1229         else
1230                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
1231                             mm, addr, ptep, pte.pte);
1232 }
1233
1234 static inline void set_pte(pte_t *ptep, pte_t pte)
1235 {
1236         if (sizeof(pteval_t) > sizeof(long))
1237                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
1238                             pte.pte, (u64)pte.pte >> 32);
1239         else
1240                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
1241                             pte.pte);
1242 }
1243
1244 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
1245                               pte_t *ptep, pte_t pte)
1246 {
1247         if (sizeof(pteval_t) > sizeof(long))
1248                 /* 5 arg words */
1249                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
1250         else
1251                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
1252 }
1253
1254 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
1255 {
1256         pmdval_t val = native_pmd_val(pmd);
1257
1258         if (sizeof(pmdval_t) > sizeof(long))
1259                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
1260         else
1261                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
1262 }
1263
1264 #if PAGETABLE_LEVELS >= 3
1265 static inline pmd_t __pmd(pmdval_t val)
1266 {
1267         pmdval_t ret;
1268
1269         if (sizeof(pmdval_t) > sizeof(long))
1270                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
1271                                    val, (u64)val >> 32);
1272         else
1273                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
1274                                    val);
1275
1276         return (pmd_t) { ret };
1277 }
1278
1279 static inline pmdval_t pmd_val(pmd_t pmd)
1280 {
1281         pmdval_t ret;
1282
1283         if (sizeof(pmdval_t) > sizeof(long))
1284                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
1285                                     pmd.pmd, (u64)pmd.pmd >> 32);
1286         else
1287                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
1288                                     pmd.pmd);
1289
1290         return ret;
1291 }
1292
1293 static inline void set_pud(pud_t *pudp, pud_t pud)
1294 {
1295         pudval_t val = native_pud_val(pud);
1296
1297         if (sizeof(pudval_t) > sizeof(long))
1298                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
1299                             val, (u64)val >> 32);
1300         else
1301                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
1302                             val);
1303 }
1304 #if PAGETABLE_LEVELS == 4
1305 static inline pud_t __pud(pudval_t val)
1306 {
1307         pudval_t ret;
1308
1309         if (sizeof(pudval_t) > sizeof(long))
1310                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
1311                                    val, (u64)val >> 32);
1312         else
1313                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
1314                                    val);
1315
1316         return (pud_t) { ret };
1317 }
1318
1319 static inline pudval_t pud_val(pud_t pud)
1320 {
1321         pudval_t ret;
1322
1323         if (sizeof(pudval_t) > sizeof(long))
1324                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
1325                                     pud.pud, (u64)pud.pud >> 32);
1326         else
1327                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
1328                                     pud.pud);
1329
1330         return ret;
1331 }
1332
1333 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
1334 {
1335         pgdval_t val = native_pgd_val(pgd);
1336
1337         if (sizeof(pgdval_t) > sizeof(long))
1338                 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
1339                             val, (u64)val >> 32);
1340         else
1341                 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
1342                             val);
1343 }
1344
1345 static inline void pgd_clear(pgd_t *pgdp)
1346 {
1347         set_pgd(pgdp, __pgd(0));
1348 }
1349
1350 static inline void pud_clear(pud_t *pudp)
1351 {
1352         set_pud(pudp, __pud(0));
1353 }
1354
1355 #endif  /* PAGETABLE_LEVELS == 4 */
1356
1357 #endif  /* PAGETABLE_LEVELS >= 3 */
1358
1359 #ifdef CONFIG_X86_PAE
1360 /* Special-case pte-setting operations for PAE, which can't update a
1361    64-bit pte atomically */
1362 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
1363 {
1364         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
1365                     pte.pte, pte.pte >> 32);
1366 }
1367
1368 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
1369                              pte_t *ptep)
1370 {
1371         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
1372 }
1373
1374 static inline void pmd_clear(pmd_t *pmdp)
1375 {
1376         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
1377 }
1378 #else  /* !CONFIG_X86_PAE */
1379 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
1380 {
1381         set_pte(ptep, pte);
1382 }
1383
1384 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
1385                              pte_t *ptep)
1386 {
1387         set_pte_at(mm, addr, ptep, __pte(0));
1388 }
1389
1390 static inline void pmd_clear(pmd_t *pmdp)
1391 {
1392         set_pmd(pmdp, __pmd(0));
1393 }
1394 #endif  /* CONFIG_X86_PAE */
1395
1396 /* Lazy mode for batching updates / context switch */
1397 enum paravirt_lazy_mode {
1398         PARAVIRT_LAZY_NONE,
1399         PARAVIRT_LAZY_MMU,
1400         PARAVIRT_LAZY_CPU,
1401 };
1402
1403 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
1404 void paravirt_start_context_switch(struct task_struct *prev);
1405 void paravirt_end_context_switch(struct task_struct *next);
1406
1407 void paravirt_enter_lazy_mmu(void);
1408 void paravirt_leave_lazy_mmu(void);
1409
1410 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
1411 static inline void arch_start_context_switch(struct task_struct *prev)
1412 {
1413         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
1414 }
1415
1416 static inline void arch_end_context_switch(struct task_struct *next)
1417 {
1418         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
1419 }
1420
1421 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
1422 static inline void arch_enter_lazy_mmu_mode(void)
1423 {
1424         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
1425 }
1426
1427 static inline void arch_leave_lazy_mmu_mode(void)
1428 {
1429         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
1430 }
1431
1432 void arch_flush_lazy_mmu_mode(void);
1433
1434 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
1435                                 phys_addr_t phys, pgprot_t flags)
1436 {
1437         pv_mmu_ops.set_fixmap(idx, phys, flags);
1438 }
1439
1440 void _paravirt_nop(void);
1441 u32 _paravirt_ident_32(u32);
1442 u64 _paravirt_ident_64(u64);
1443
1444 #define paravirt_nop    ((void *)_paravirt_nop)
1445
1446 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
1447
1448 static inline int __raw_spin_is_locked(struct raw_spinlock *lock)
1449 {
1450         return PVOP_CALL1(int, pv_lock_ops.spin_is_locked, lock);
1451 }
1452
1453 static inline int __raw_spin_is_contended(struct raw_spinlock *lock)
1454 {
1455         return PVOP_CALL1(int, pv_lock_ops.spin_is_contended, lock);
1456 }
1457 #define __raw_spin_is_contended __raw_spin_is_contended
1458
1459 static __always_inline void __raw_spin_lock(struct raw_spinlock *lock)
1460 {
1461         PVOP_VCALL1(pv_lock_ops.spin_lock, lock);
1462 }
1463
1464 static __always_inline void __raw_spin_lock_flags(struct raw_spinlock *lock,
1465                                                   unsigned long flags)
1466 {
1467         PVOP_VCALL2(pv_lock_ops.spin_lock_flags, lock, flags);
1468 }
1469
1470 static __always_inline int __raw_spin_trylock(struct raw_spinlock *lock)
1471 {
1472         return PVOP_CALL1(int, pv_lock_ops.spin_trylock, lock);
1473 }
1474
1475 static __always_inline void __raw_spin_unlock(struct raw_spinlock *lock)
1476 {
1477         PVOP_VCALL1(pv_lock_ops.spin_unlock, lock);
1478 }
1479
1480 #endif
1481
1482 /* These all sit in the .parainstructions section to tell us what to patch. */
1483 struct paravirt_patch_site {
1484         u8 *instr;              /* original instructions */
1485         u8 instrtype;           /* type of this instruction */
1486         u8 len;                 /* length of original instruction */
1487         u16 clobbers;           /* what registers you may clobber */
1488 };
1489
1490 extern struct paravirt_patch_site __parainstructions[],
1491         __parainstructions_end[];
1492
1493 #ifdef CONFIG_X86_32
1494 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
1495 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
1496
1497 /* save and restore all caller-save registers, except return value */
1498 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
1499 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
1500
1501 #define PV_FLAGS_ARG "0"
1502 #define PV_EXTRA_CLOBBERS
1503 #define PV_VEXTRA_CLOBBERS
1504 #else
1505 /* save and restore all caller-save registers, except return value */
1506 #define PV_SAVE_ALL_CALLER_REGS                                         \
1507         "push %rcx;"                                                    \
1508         "push %rdx;"                                                    \
1509         "push %rsi;"                                                    \
1510         "push %rdi;"                                                    \
1511         "push %r8;"                                                     \
1512         "push %r9;"                                                     \
1513         "push %r10;"                                                    \
1514         "push %r11;"
1515 #define PV_RESTORE_ALL_CALLER_REGS                                      \
1516         "pop %r11;"                                                     \
1517         "pop %r10;"                                                     \
1518         "pop %r9;"                                                      \
1519         "pop %r8;"                                                      \
1520         "pop %rdi;"                                                     \
1521         "pop %rsi;"                                                     \
1522         "pop %rdx;"                                                     \
1523         "pop %rcx;"
1524
1525 /* We save some registers, but all of them, that's too much. We clobber all
1526  * caller saved registers but the argument parameter */
1527 #define PV_SAVE_REGS "pushq %%rdi;"
1528 #define PV_RESTORE_REGS "popq %%rdi;"
1529 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
1530 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
1531 #define PV_FLAGS_ARG "D"
1532 #endif
1533
1534 /*
1535  * Generate a thunk around a function which saves all caller-save
1536  * registers except for the return value.  This allows C functions to
1537  * be called from assembler code where fewer than normal registers are
1538  * available.  It may also help code generation around calls from C
1539  * code if the common case doesn't use many registers.
1540  *
1541  * When a callee is wrapped in a thunk, the caller can assume that all
1542  * arg regs and all scratch registers are preserved across the
1543  * call. The return value in rax/eax will not be saved, even for void
1544  * functions.
1545  */
1546 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
1547         extern typeof(func) __raw_callee_save_##func;                   \
1548         static void *__##func##__ __used = func;                        \
1549                                                                         \
1550         asm(".pushsection .text;"                                       \
1551             "__raw_callee_save_" #func ": "                             \
1552             PV_SAVE_ALL_CALLER_REGS                                     \
1553             "call " #func ";"                                           \
1554             PV_RESTORE_ALL_CALLER_REGS                                  \
1555             "ret;"                                                      \
1556             ".popsection")
1557
1558 /* Get a reference to a callee-save function */
1559 #define PV_CALLEE_SAVE(func)                                            \
1560         ((struct paravirt_callee_save) { __raw_callee_save_##func })
1561
1562 /* Promise that "func" already uses the right calling convention */
1563 #define __PV_IS_CALLEE_SAVE(func)                       \
1564         ((struct paravirt_callee_save) { func })
1565
1566 static inline unsigned long __raw_local_save_flags(void)
1567 {
1568         unsigned long f;
1569
1570         asm volatile(paravirt_alt(PARAVIRT_CALL)
1571                      : "=a"(f)
1572                      : paravirt_type(pv_irq_ops.save_fl),
1573                        paravirt_clobber(CLBR_EAX)
1574                      : "memory", "cc");
1575         return f;
1576 }
1577
1578 static inline void raw_local_irq_restore(unsigned long f)
1579 {
1580         asm volatile(paravirt_alt(PARAVIRT_CALL)
1581                      : "=a"(f)
1582                      : PV_FLAGS_ARG(f),
1583                        paravirt_type(pv_irq_ops.restore_fl),
1584                        paravirt_clobber(CLBR_EAX)
1585                      : "memory", "cc");
1586 }
1587
1588 static inline void raw_local_irq_disable(void)
1589 {
1590         asm volatile(paravirt_alt(PARAVIRT_CALL)
1591                      :
1592                      : paravirt_type(pv_irq_ops.irq_disable),
1593                        paravirt_clobber(CLBR_EAX)
1594                      : "memory", "eax", "cc");
1595 }
1596
1597 static inline void raw_local_irq_enable(void)
1598 {
1599         asm volatile(paravirt_alt(PARAVIRT_CALL)
1600                      :
1601                      : paravirt_type(pv_irq_ops.irq_enable),
1602                        paravirt_clobber(CLBR_EAX)
1603                      : "memory", "eax", "cc");
1604 }
1605
1606 static inline unsigned long __raw_local_irq_save(void)
1607 {
1608         unsigned long f;
1609
1610         f = __raw_local_save_flags();
1611         raw_local_irq_disable();
1612         return f;
1613 }
1614
1615
1616 /* Make sure as little as possible of this mess escapes. */
1617 #undef PARAVIRT_CALL
1618 #undef __PVOP_CALL
1619 #undef __PVOP_VCALL
1620 #undef PVOP_VCALL0
1621 #undef PVOP_CALL0
1622 #undef PVOP_VCALL1
1623 #undef PVOP_CALL1
1624 #undef PVOP_VCALL2
1625 #undef PVOP_CALL2
1626 #undef PVOP_VCALL3
1627 #undef PVOP_CALL3
1628 #undef PVOP_VCALL4
1629 #undef PVOP_CALL4
1630
1631 #else  /* __ASSEMBLY__ */
1632
1633 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
1634 771:;                                           \
1635         ops;                                    \
1636 772:;                                           \
1637         .pushsection .parainstructions,"a";     \
1638          .align algn;                           \
1639          word 771b;                             \
1640          .byte ptype;                           \
1641          .byte 772b-771b;                       \
1642          .short clobbers;                       \
1643         .popsection
1644
1645
1646 #define COND_PUSH(set, mask, reg)                       \
1647         .if ((~(set)) & mask); push %reg; .endif
1648 #define COND_POP(set, mask, reg)                        \
1649         .if ((~(set)) & mask); pop %reg; .endif
1650
1651 #ifdef CONFIG_X86_64
1652
1653 #define PV_SAVE_REGS(set)                       \
1654         COND_PUSH(set, CLBR_RAX, rax);          \
1655         COND_PUSH(set, CLBR_RCX, rcx);          \
1656         COND_PUSH(set, CLBR_RDX, rdx);          \
1657         COND_PUSH(set, CLBR_RSI, rsi);          \
1658         COND_PUSH(set, CLBR_RDI, rdi);          \
1659         COND_PUSH(set, CLBR_R8, r8);            \
1660         COND_PUSH(set, CLBR_R9, r9);            \
1661         COND_PUSH(set, CLBR_R10, r10);          \
1662         COND_PUSH(set, CLBR_R11, r11)
1663 #define PV_RESTORE_REGS(set)                    \
1664         COND_POP(set, CLBR_R11, r11);           \
1665         COND_POP(set, CLBR_R10, r10);           \
1666         COND_POP(set, CLBR_R9, r9);             \
1667         COND_POP(set, CLBR_R8, r8);             \
1668         COND_POP(set, CLBR_RDI, rdi);           \
1669         COND_POP(set, CLBR_RSI, rsi);           \
1670         COND_POP(set, CLBR_RDX, rdx);           \
1671         COND_POP(set, CLBR_RCX, rcx);           \
1672         COND_POP(set, CLBR_RAX, rax)
1673
1674 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
1675 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
1676 #define PARA_INDIRECT(addr)     *addr(%rip)
1677 #else
1678 #define PV_SAVE_REGS(set)                       \
1679         COND_PUSH(set, CLBR_EAX, eax);          \
1680         COND_PUSH(set, CLBR_EDI, edi);          \
1681         COND_PUSH(set, CLBR_ECX, ecx);          \
1682         COND_PUSH(set, CLBR_EDX, edx)
1683 #define PV_RESTORE_REGS(set)                    \
1684         COND_POP(set, CLBR_EDX, edx);           \
1685         COND_POP(set, CLBR_ECX, ecx);           \
1686         COND_POP(set, CLBR_EDI, edi);           \
1687         COND_POP(set, CLBR_EAX, eax)
1688
1689 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
1690 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
1691 #define PARA_INDIRECT(addr)     *%cs:addr
1692 #endif
1693
1694 #define INTERRUPT_RETURN                                                \
1695         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
1696                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
1697
1698 #define DISABLE_INTERRUPTS(clobbers)                                    \
1699         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
1700                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
1701                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
1702                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
1703
1704 #define ENABLE_INTERRUPTS(clobbers)                                     \
1705         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
1706                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
1707                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
1708                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
1709
1710 #define USERGS_SYSRET32                                                 \
1711         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret32),       \
1712                   CLBR_NONE,                                            \
1713                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret32))
1714
1715 #ifdef CONFIG_X86_32
1716 #define GET_CR0_INTO_EAX                                \
1717         push %ecx; push %edx;                           \
1718         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
1719         pop %edx; pop %ecx
1720
1721 #define ENABLE_INTERRUPTS_SYSEXIT                                       \
1722         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
1723                   CLBR_NONE,                                            \
1724                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
1725
1726
1727 #else   /* !CONFIG_X86_32 */
1728
1729 /*
1730  * If swapgs is used while the userspace stack is still current,
1731  * there's no way to call a pvop.  The PV replacement *must* be
1732  * inlined, or the swapgs instruction must be trapped and emulated.
1733  */
1734 #define SWAPGS_UNSAFE_STACK                                             \
1735         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
1736                   swapgs)
1737
1738 /*
1739  * Note: swapgs is very special, and in practise is either going to be
1740  * implemented with a single "swapgs" instruction or something very
1741  * special.  Either way, we don't need to save any registers for
1742  * it.
1743  */
1744 #define SWAPGS                                                          \
1745         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
1746                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
1747                  )
1748
1749 #define GET_CR2_INTO_RCX                                \
1750         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2); \
1751         movq %rax, %rcx;                                \
1752         xorq %rax, %rax;
1753
1754 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
1755         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
1756                   CLBR_NONE,                                            \
1757                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
1758
1759 #define USERGS_SYSRET64                                                 \
1760         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
1761                   CLBR_NONE,                                            \
1762                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
1763
1764 #define ENABLE_INTERRUPTS_SYSEXIT32                                     \
1765         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
1766                   CLBR_NONE,                                            \
1767                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
1768 #endif  /* CONFIG_X86_32 */
1769
1770 #endif /* __ASSEMBLY__ */
1771 #endif /* CONFIG_PARAVIRT */
1772 #endif /* _ASM_X86_PARAVIRT_H */