arch/x86/include/asm/paravirt_types.h

   1 #ifndef _ASM_X86_PARAVIRT_TYPES_H
   2 #define _ASM_X86_PARAVIRT_TYPES_H
   3
   4 /* Bitmask of what can be clobbered: usually at least eax. */
   5 #define CLBR_NONE 0
   6 #define CLBR_EAX  (1 << 0)
   7 #define CLBR_ECX  (1 << 1)
   8 #define CLBR_EDX  (1 << 2)
   9 #define CLBR_EDI  (1 << 3)
  10
  11 #ifdef CONFIG_X86_32
  12 /* CLBR_ANY should match all regs platform has. For i386, that's just it */
  13 #define CLBR_ANY  ((1 << 4) - 1)
  14
  15 #define CLBR_ARG_REGS   (CLBR_EAX | CLBR_EDX | CLBR_ECX)
  16 #define CLBR_RET_REG    (CLBR_EAX | CLBR_EDX)
  17 #define CLBR_SCRATCH    (0)
  18 #else
  19 #define CLBR_RAX  CLBR_EAX
  20 #define CLBR_RCX  CLBR_ECX
  21 #define CLBR_RDX  CLBR_EDX
  22 #define CLBR_RDI  CLBR_EDI
  23 #define CLBR_RSI  (1 << 4)
  24 #define CLBR_R8   (1 << 5)
  25 #define CLBR_R9   (1 << 6)
  26 #define CLBR_R10  (1 << 7)
  27 #define CLBR_R11  (1 << 8)
  28
  29 #define CLBR_ANY  ((1 << 9) - 1)
  30
  31 #define CLBR_ARG_REGS   (CLBR_RDI | CLBR_RSI | CLBR_RDX | \
  32                          CLBR_RCX | CLBR_R8 | CLBR_R9)
  33 #define CLBR_RET_REG    (CLBR_RAX)
  34 #define CLBR_SCRATCH    (CLBR_R10 | CLBR_R11)
  35
  36 #endif /* X86_64 */
  37
  38 #define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
  39
  40 #ifndef __ASSEMBLY__
  41
  42 #include <asm/desc_defs.h>
  43 #include <asm/kmap_types.h>
  44
  45 struct page;
  46 struct thread_struct;
  47 struct desc_ptr;
  48 struct tss_struct;
  49 struct mm_struct;
  50 struct desc_struct;
  51 struct task_struct;
  52 struct cpumask;
  53
  54 /*
  55  * Wrapper type for pointers to code which uses the non-standard
  56  * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
  57  */
  58 struct paravirt_callee_save {
  59         void *func;
  60 };
  61
  62 /* general info */
  63 struct pv_info {
  64         unsigned int kernel_rpl;
  65         int shared_kernel_pmd;
  66         int paravirt_enabled;
  67         const char *name;
  68 };
  69
  70 struct pv_init_ops {
  71         /*
  72          * Patch may replace one of the defined code sequences with
  73          * arbitrary code, subject to the same register constraints.
  74          * This generally means the code is not free to clobber any
  75          * registers other than EAX.  The patch function should return
  76          * the number of bytes of code generated, as we nop pad the
  77          * rest in generic code.
  78          */
  79         unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
  80                           unsigned long addr, unsigned len);
  81 };
  82
  83
  84 struct pv_lazy_ops {
  85         /* Set deferred update mode, used for batching operations. */
  86         void (*enter)(void);
  87         void (*leave)(void);
  88 };
  89
  90 struct pv_time_ops {
  91         unsigned long long (*sched_clock)(void);
  92         unsigned long long (*steal_clock)(int cpu);
  93         unsigned long (*get_tsc_khz)(void);
  94 };
  95
  96 struct pv_cpu_ops {
  97         /* hooks for various privileged instructions */
  98         unsigned long (*get_debugreg)(int regno);
  99         void (*set_debugreg)(int regno, unsigned long value);
 100
 101         void (*clts)(void);
 102
 103         unsigned long (*read_cr0)(void);
 104         void (*write_cr0)(unsigned long);
 105
 106         unsigned long (*read_cr4_safe)(void);
 107         unsigned long (*read_cr4)(void);
 108         void (*write_cr4)(unsigned long);
 109
 110 #ifdef CONFIG_X86_64
 111         unsigned long (*read_cr8)(void);
 112         void (*write_cr8)(unsigned long);
 113 #endif
 114
 115         /* Segment descriptor handling */
 116         void (*load_tr_desc)(void);
 117         void (*load_gdt)(const struct desc_ptr *);
 118         void (*load_idt)(const struct desc_ptr *);
 119         void (*store_gdt)(struct desc_ptr *);
 120         void (*store_idt)(struct desc_ptr *);
 121         void (*set_ldt)(const void *desc, unsigned entries);
 122         unsigned long (*store_tr)(void);
 123         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
 124 #ifdef CONFIG_X86_64
 125         void (*load_gs_index)(unsigned int idx);
 126 #endif
 127         void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
 128                                 const void *desc);
 129         void (*write_gdt_entry)(struct desc_struct *,
 130                                 int entrynum, const void *desc, int size);
 131         void (*write_idt_entry)(gate_desc *,
 132                                 int entrynum, const gate_desc *gate);
 133         void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
 134         void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
 135
 136         void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
 137
 138         void (*set_iopl_mask)(unsigned mask);
 139
 140         void (*wbinvd)(void);
 141         void (*io_delay)(void);
 142
 143         /* cpuid emulation, mostly so that caps bits can be disabled */
 144         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
 145                       unsigned int *ecx, unsigned int *edx);
 146
 147         /* MSR, PMC and TSR operations.
 148            err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
 149         u64 (*read_msr)(unsigned int msr, int *err);
 150         int (*rdmsr_regs)(u32 *regs);
 151         int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
 152         int (*wrmsr_regs)(u32 *regs);
 153
 154         u64 (*read_tsc)(void);
 155         u64 (*read_pmc)(int counter);
 156         unsigned long long (*read_tscp)(unsigned int *aux);
 157
 158         /*
 159          * Atomically enable interrupts and return to userspace.  This
 160          * is only ever used to return to 32-bit processes; in a
 161          * 64-bit kernel, it's used for 32-on-64 compat processes, but
 162          * never native 64-bit processes.  (Jump, not call.)
 163          */
 164         void (*irq_enable_sysexit)(void);
 165
 166         /*
 167          * Switch to usermode gs and return to 64-bit usermode using
 168          * sysret.  Only used in 64-bit kernels to return to 64-bit
 169          * processes.  Usermode register state, including %rsp, must
 170          * already be restored.
 171          */
 172         void (*usergs_sysret64)(void);
 173
 174         /*
 175          * Switch to usermode gs and return to 32-bit usermode using
 176          * sysret.  Used to return to 32-on-64 compat processes.
 177          * Other usermode register state, including %esp, must already
 178          * be restored.
 179          */
 180         void (*usergs_sysret32)(void);
 181
 182         /* Normal iret.  Jump to this with the standard iret stack
 183            frame set up. */
 184         void (*iret)(void);
 185
 186         void (*swapgs)(void);
 187
 188         void (*start_context_switch)(struct task_struct *prev);
 189         void (*end_context_switch)(struct task_struct *next);
 190 };
 191
 192 struct pv_irq_ops {
 193         /*
 194          * Get/set interrupt state.  save_fl and restore_fl are only
 195          * expected to use X86_EFLAGS_IF; all other bits
 196          * returned from save_fl are undefined, and may be ignored by
 197          * restore_fl.
 198          *
 199          * NOTE: These functions callers expect the callee to preserve
 200          * more registers than the standard C calling convention.
 201          */
 202         struct paravirt_callee_save save_fl;
 203         struct paravirt_callee_save restore_fl;
 204         struct paravirt_callee_save irq_disable;
 205         struct paravirt_callee_save irq_enable;
 206
 207         void (*safe_halt)(void);
 208         void (*halt)(void);
 209
 210 #ifdef CONFIG_X86_64
 211         void (*adjust_exception_frame)(void);
 212 #endif
 213 };
 214
 215 struct pv_apic_ops {
 216 #ifdef CONFIG_X86_LOCAL_APIC
 217         void (*startup_ipi_hook)(int phys_apicid,
 218                                  unsigned long start_eip,
 219                                  unsigned long start_esp);
 220 #endif
 221 };
 222
 223 struct pv_mmu_ops {
 224         unsigned long (*read_cr2)(void);
 225         void (*write_cr2)(unsigned long);
 226
 227         unsigned long (*read_cr3)(void);
 228         void (*write_cr3)(unsigned long);
 229
 230         /*
 231          * Hooks for intercepting the creation/use/destruction of an
 232          * mm_struct.
 233          */
 234         void (*activate_mm)(struct mm_struct *prev,
 235                             struct mm_struct *next);
 236         void (*dup_mmap)(struct mm_struct *oldmm,
 237                          struct mm_struct *mm);
 238         void (*exit_mmap)(struct mm_struct *mm);
 239
 240
 241         /* TLB operations */
 242         void (*flush_tlb_user)(void);
 243         void (*flush_tlb_kernel)(void);
 244         void (*flush_tlb_single)(unsigned long addr);
 245         void (*flush_tlb_others)(const struct cpumask *cpus,
 246                                  struct mm_struct *mm,
 247                                  unsigned long va);
 248
 249         /* Hooks for allocating and freeing a pagetable top-level */
 250         int  (*pgd_alloc)(struct mm_struct *mm);
 251         void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
 252
 253         /*
 254          * Hooks for allocating/releasing pagetable pages when they're
 255          * attached to a pagetable
 256          */
 257         void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
 258         void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
 259         void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
 260         void (*release_pte)(unsigned long pfn);
 261         void (*release_pmd)(unsigned long pfn);
 262         void (*release_pud)(unsigned long pfn);
 263
 264         /* Pagetable manipulation functions */
 265         void (*set_pte)(pte_t *ptep, pte_t pteval);
 266         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
 267                            pte_t *ptep, pte_t pteval);
 268         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
 269         void (*set_pmd_at)(struct mm_struct *mm, unsigned long addr,
 270                            pmd_t *pmdp, pmd_t pmdval);
 271         void (*pte_update)(struct mm_struct *mm, unsigned long addr,
 272                            pte_t *ptep);
 273         void (*pte_update_defer)(struct mm_struct *mm,
 274                                  unsigned long addr, pte_t *ptep);
 275         void (*pmd_update)(struct mm_struct *mm, unsigned long addr,
 276                            pmd_t *pmdp);
 277         void (*pmd_update_defer)(struct mm_struct *mm,
 278                                  unsigned long addr, pmd_t *pmdp);
 279
 280         pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
 281                                         pte_t *ptep);
 282         void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
 283                                         pte_t *ptep, pte_t pte);
 284
 285         struct paravirt_callee_save pte_val;
 286         struct paravirt_callee_save make_pte;
 287
 288         struct paravirt_callee_save pgd_val;
 289         struct paravirt_callee_save make_pgd;
 290
 291 #if PAGETABLE_LEVELS >= 3
 292 #ifdef CONFIG_X86_PAE
 293         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
 294         void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
 295                           pte_t *ptep);
 296         void (*pmd_clear)(pmd_t *pmdp);
 297
 298 #endif  /* CONFIG_X86_PAE */
 299
 300         void (*set_pud)(pud_t *pudp, pud_t pudval);
 301
 302         struct paravirt_callee_save pmd_val;
 303         struct paravirt_callee_save make_pmd;
 304
 305 #if PAGETABLE_LEVELS == 4
 306         struct paravirt_callee_save pud_val;
 307         struct paravirt_callee_save make_pud;
 308
 309         void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
 310 #endif  /* PAGETABLE_LEVELS == 4 */
 311 #endif  /* PAGETABLE_LEVELS >= 3 */
 312
 313         struct pv_lazy_ops lazy_mode;
 314
 315         /* dom0 ops */
 316
 317         /* Sometimes the physical address is a pfn, and sometimes its
 318            an mfn.  We can tell which is which from the index. */
 319         void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
 320                            phys_addr_t phys, pgprot_t flags);
 321 };
 322
 323 struct arch_spinlock;
 324 struct pv_lock_ops {
 325         int (*spin_is_locked)(struct arch_spinlock *lock);
 326         int (*spin_is_contended)(struct arch_spinlock *lock);
 327         void (*spin_lock)(struct arch_spinlock *lock);
 328         void (*spin_lock_flags)(struct arch_spinlock *lock, unsigned long flags);
 329         int (*spin_trylock)(struct arch_spinlock *lock);
 330         void (*spin_unlock)(struct arch_spinlock *lock);
 331 };
 332
 333 /* This contains all the paravirt structures: we get a convenient
 334  * number for each function using the offset which we use to indicate
 335  * what to patch. */
 336 struct paravirt_patch_template {
 337         struct pv_init_ops pv_init_ops;
 338         struct pv_time_ops pv_time_ops;
 339         struct pv_cpu_ops pv_cpu_ops;
 340         struct pv_irq_ops pv_irq_ops;
 341         struct pv_apic_ops pv_apic_ops;
 342         struct pv_mmu_ops pv_mmu_ops;
 343         struct pv_lock_ops pv_lock_ops;
 344 };
 345
 346 extern struct pv_info pv_info;
 347 extern struct pv_init_ops pv_init_ops;
 348 extern struct pv_time_ops pv_time_ops;
 349 extern struct pv_cpu_ops pv_cpu_ops;
 350 extern struct pv_irq_ops pv_irq_ops;
 351 extern struct pv_apic_ops pv_apic_ops;
 352 extern struct pv_mmu_ops pv_mmu_ops;
 353 extern struct pv_lock_ops pv_lock_ops;
 354
 355 #define PARAVIRT_PATCH(x)                                       \
 356         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
 357
 358 #define paravirt_type(op)                               \
 359         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
 360         [paravirt_opptr] "i" (&(op))
 361 #define paravirt_clobber(clobber)               \
 362         [paravirt_clobber] "i" (clobber)
 363
 364 /*
 365  * Generate some code, and mark it as patchable by the
 366  * apply_paravirt() alternate instruction patcher.
 367  */
 368 #define _paravirt_alt(insn_string, type, clobber)       \
 369         "771:\n\t" insn_string "\n" "772:\n"            \
 370         ".pushsection .parainstructions,\"a\"\n"        \
 371         _ASM_ALIGN "\n"                                 \
 372         _ASM_PTR " 771b\n"                              \
 373         "  .byte " type "\n"                            \
 374         "  .byte 772b-771b\n"                           \
 375         "  .short " clobber "\n"                        \
 376         ".popsection\n"
 377
 378 /* Generate patchable code, with the default asm parameters. */
 379 #define paravirt_alt(insn_string)                                       \
 380         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
 381
 382 /* Simple instruction patching code. */
 383 #define DEF_NATIVE(ops, name, code)                                     \
 384         extern const char start_##ops##_##name[], end_##ops##_##name[]; \
 385         asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
 386
 387 unsigned paravirt_patch_nop(void);
 388 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
 389 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
 390 unsigned paravirt_patch_ignore(unsigned len);
 391 unsigned paravirt_patch_call(void *insnbuf,
 392                              const void *target, u16 tgt_clobbers,
 393                              unsigned long addr, u16 site_clobbers,
 394                              unsigned len);
 395 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
 396                             unsigned long addr, unsigned len);
 397 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
 398                                 unsigned long addr, unsigned len);
 399
 400 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
 401                               const char *start, const char *end);
 402
 403 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
 404                       unsigned long addr, unsigned len);
 405
 406 int paravirt_disable_iospace(void);
 407
 408 /*
 409  * This generates an indirect call based on the operation type number.
 410  * The type number, computed in PARAVIRT_PATCH, is derived from the
 411  * offset into the paravirt_patch_template structure, and can therefore be
 412  * freely converted back into a structure offset.
 413  */
 414 #define PARAVIRT_CALL   "call *%c[paravirt_opptr];"
 415
 416 /*
 417  * These macros are intended to wrap calls through one of the paravirt
 418  * ops structs, so that they can be later identified and patched at
 419  * runtime.
 420  *
 421  * Normally, a call to a pv_op function is a simple indirect call:
 422  * (pv_op_struct.operations)(args...).
 423  *
 424  * Unfortunately, this is a relatively slow operation for modern CPUs,
 425  * because it cannot necessarily determine what the destination
 426  * address is.  In this case, the address is a runtime constant, so at
 427  * the very least we can patch the call to e a simple direct call, or
 428  * ideally, patch an inline implementation into the callsite.  (Direct
 429  * calls are essentially free, because the call and return addresses
 430  * are completely predictable.)
 431  *
 432  * For i386, these macros rely on the standard gcc "regparm(3)" calling
 433  * convention, in which the first three arguments are placed in %eax,
 434  * %edx, %ecx (in that order), and the remaining arguments are placed
 435  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
 436  * to be modified (either clobbered or used for return values).
 437  * X86_64, on the other hand, already specifies a register-based calling
 438  * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
 439  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
 440  * special handling for dealing with 4 arguments, unlike i386.
 441  * However, x86_64 also have to clobber all caller saved registers, which
 442  * unfortunately, are quite a bit (r8 - r11)
 443  *
 444  * The call instruction itself is marked by placing its start address
 445  * and size into the .parainstructions section, so that
 446  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
 447  * appropriate patching under the control of the backend pv_init_ops
 448  * implementation.
 449  *
 450  * Unfortunately there's no way to get gcc to generate the args setup
 451  * for the call, and then allow the call itself to be generated by an
 452  * inline asm.  Because of this, we must do the complete arg setup and
 453  * return value handling from within these macros.  This is fairly
 454  * cumbersome.
 455  *
 456  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
 457  * It could be extended to more arguments, but there would be little
 458  * to be gained from that.  For each number of arguments, there are
 459  * the two VCALL and CALL variants for void and non-void functions.
 460  *
 461  * When there is a return value, the invoker of the macro must specify
 462  * the return type.  The macro then uses sizeof() on that type to
 463  * determine whether its a 32 or 64 bit value, and places the return
 464  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
 465  * 64-bit). For x86_64 machines, it just returns at %rax regardless of
 466  * the return value size.
 467  *
 468  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
 469  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
 470  * in low,high order
 471  *
 472  * Small structures are passed and returned in registers.  The macro
 473  * calling convention can't directly deal with this, so the wrapper
 474  * functions must do this.
 475  *
 476  * These PVOP_* macros are only defined within this header.  This
 477  * means that all uses must be wrapped in inline functions.  This also
 478  * makes sure the incoming and outgoing types are always correct.
 479  */
 480 #ifdef CONFIG_X86_32
 481 #define PVOP_VCALL_ARGS                         \
 482         unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
 483 #define PVOP_CALL_ARGS                  PVOP_VCALL_ARGS
 484
 485 #define PVOP_CALL_ARG1(x)               "a" ((unsigned long)(x))
 486 #define PVOP_CALL_ARG2(x)               "d" ((unsigned long)(x))
 487 #define PVOP_CALL_ARG3(x)               "c" ((unsigned long)(x))
 488
 489 #define PVOP_VCALL_CLOBBERS             "=a" (__eax), "=d" (__edx),     \
 490                                         "=c" (__ecx)
 491 #define PVOP_CALL_CLOBBERS              PVOP_VCALL_CLOBBERS
 492
 493 #define PVOP_VCALLEE_CLOBBERS           "=a" (__eax), "=d" (__edx)
 494 #define PVOP_CALLEE_CLOBBERS            PVOP_VCALLEE_CLOBBERS
 495
 496 #define EXTRA_CLOBBERS
 497 #define VEXTRA_CLOBBERS
 498 #else  /* CONFIG_X86_64 */
 499 /* [re]ax isn't an arg, but the return val */
 500 #define PVOP_VCALL_ARGS                                 \
 501         unsigned long __edi = __edi, __esi = __esi,     \
 502                 __edx = __edx, __ecx = __ecx, __eax = __eax
 503 #define PVOP_CALL_ARGS          PVOP_VCALL_ARGS
 504
 505 #define PVOP_CALL_ARG1(x)               "D" ((unsigned long)(x))
 506 #define PVOP_CALL_ARG2(x)               "S" ((unsigned long)(x))
 507 #define PVOP_CALL_ARG3(x)               "d" ((unsigned long)(x))
 508 #define PVOP_CALL_ARG4(x)               "c" ((unsigned long)(x))
 509
 510 #define PVOP_VCALL_CLOBBERS     "=D" (__edi),                           \
 511                                 "=S" (__esi), "=d" (__edx),             \
 512                                 "=c" (__ecx)
 513 #define PVOP_CALL_CLOBBERS      PVOP_VCALL_CLOBBERS, "=a" (__eax)
 514
 515 /* void functions are still allowed [re]ax for scratch */
 516 #define PVOP_VCALLEE_CLOBBERS   "=a" (__eax)
 517 #define PVOP_CALLEE_CLOBBERS    PVOP_VCALLEE_CLOBBERS
 518
 519 #define EXTRA_CLOBBERS   , "r8", "r9", "r10", "r11"
 520 #define VEXTRA_CLOBBERS  , "rax", "r8", "r9", "r10", "r11"
 521 #endif  /* CONFIG_X86_32 */
 522
 523 #ifdef CONFIG_PARAVIRT_DEBUG
 524 #define PVOP_TEST_NULL(op)      BUG_ON(op == NULL)
 525 #else
 526 #define PVOP_TEST_NULL(op)      ((void)op)
 527 #endif
 528
 529 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,         \
 530                       pre, post, ...)                                   \
 531         ({                                                              \
 532                 rettype __ret;                                          \
 533                 PVOP_CALL_ARGS;                                         \
 534                 PVOP_TEST_NULL(op);                                     \
 535                 /* This is 32-bit specific, but is okay in 64-bit */    \
 536                 /* since this condition will never hold */              \
 537                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
 538                         asm volatile(pre                                \
 539                                      paravirt_alt(PARAVIRT_CALL)        \
 540                                      post                               \
 541                                      : call_clbr                        \
 542                                      : paravirt_type(op),               \
 543                                        paravirt_clobber(clbr),          \
 544                                        ##__VA_ARGS__                    \
 545                                      : "memory", "cc" extra_clbr);      \
 546                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
 547                 } else {                                                \
 548                         asm volatile(pre                                \
 549                                      paravirt_alt(PARAVIRT_CALL)        \
 550                                      post                               \
 551                                      : call_clbr                        \
 552                                      : paravirt_type(op),               \
 553                                        paravirt_clobber(clbr),          \
 554                                        ##__VA_ARGS__                    \
 555                                      : "memory", "cc" extra_clbr);      \
 556                         __ret = (rettype)__eax;                         \
 557                 }                                                       \
 558                 __ret;                                                  \
 559         })
 560
 561 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
 562         ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,        \
 563                       EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
 564
 565 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)                  \
 566         ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
 567                       PVOP_CALLEE_CLOBBERS, ,                           \
 568                       pre, post, ##__VA_ARGS__)
 569
 570
 571 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
 572         ({                                                              \
 573                 PVOP_VCALL_ARGS;                                        \
 574                 PVOP_TEST_NULL(op);                                     \
 575                 asm volatile(pre                                        \
 576                              paravirt_alt(PARAVIRT_CALL)                \
 577                              post                                       \
 578                              : call_clbr                                \
 579                              : paravirt_type(op),                       \
 580                                paravirt_clobber(clbr),                  \
 581                                ##__VA_ARGS__                            \
 582                              : "memory", "cc" extra_clbr);              \
 583         })
 584
 585 #define __PVOP_VCALL(op, pre, post, ...)                                \
 586         ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,               \
 587                        VEXTRA_CLOBBERS,                                 \
 588                        pre, post, ##__VA_ARGS__)
 589
 590 #define __PVOP_VCALLEESAVE(op, pre, post, ...)                          \
 591         ____PVOP_VCALL(op.func, CLBR_RET_REG,                           \
 592                       PVOP_VCALLEE_CLOBBERS, ,                          \
 593                       pre, post, ##__VA_ARGS__)
 594
 595
 596
 597 #define PVOP_CALL0(rettype, op)                                         \
 598         __PVOP_CALL(rettype, op, "", "")
 599 #define PVOP_VCALL0(op)                                                 \
 600         __PVOP_VCALL(op, "", "")
 601
 602 #define PVOP_CALLEE0(rettype, op)                                       \
 603         __PVOP_CALLEESAVE(rettype, op, "", "")
 604 #define PVOP_VCALLEE0(op)                                               \
 605         __PVOP_VCALLEESAVE(op, "", "")
 606
 607
 608 #define PVOP_CALL1(rettype, op, arg1)                                   \
 609         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 610 #define PVOP_VCALL1(op, arg1)                                           \
 611         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
 612
 613 #define PVOP_CALLEE1(rettype, op, arg1)                                 \
 614         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 615 #define PVOP_VCALLEE1(op, arg1)                                         \
 616         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
 617
 618
 619 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
 620         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 621                     PVOP_CALL_ARG2(arg2))
 622 #define PVOP_VCALL2(op, arg1, arg2)                                     \
 623         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 624                      PVOP_CALL_ARG2(arg2))
 625
 626 #define PVOP_CALLEE2(rettype, op, arg1, arg2)                           \
 627         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),    \
 628                           PVOP_CALL_ARG2(arg2))
 629 #define PVOP_VCALLEE2(op, arg1, arg2)                                   \
 630         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),            \
 631                            PVOP_CALL_ARG2(arg2))
 632
 633
 634 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
 635         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 636                     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 637 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
 638         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 639                      PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 640
 641 /* This is the only difference in x86_64. We can make it much simpler */
 642 #ifdef CONFIG_X86_32
 643 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 644         __PVOP_CALL(rettype, op,                                        \
 645                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 646                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 647                     PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
 648 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 649         __PVOP_VCALL(op,                                                \
 650                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 651                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
 652                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
 653 #else
 654 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 655         __PVOP_CALL(rettype, op, "", "",                                \
 656                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 657                     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 658 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 659         __PVOP_VCALL(op, "", "",                                        \
 660                      PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),        \
 661                      PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 662 #endif
 663
 664 /* Lazy mode for batching updates / context switch */
 665 enum paravirt_lazy_mode {
 666         PARAVIRT_LAZY_NONE,
 667         PARAVIRT_LAZY_MMU,
 668         PARAVIRT_LAZY_CPU,
 669 };
 670
 671 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
 672 void paravirt_start_context_switch(struct task_struct *prev);
 673 void paravirt_end_context_switch(struct task_struct *next);
 674
 675 void paravirt_enter_lazy_mmu(void);
 676 void paravirt_leave_lazy_mmu(void);
 677
 678 void _paravirt_nop(void);
 679 u32 _paravirt_ident_32(u32);
 680 u64 _paravirt_ident_64(u64);
 681
 682 #define paravirt_nop    ((void *)_paravirt_nop)
 683
 684 /* These all sit in the .parainstructions section to tell us what to patch. */
 685 struct paravirt_patch_site {
 686         u8 *instr;              /* original instructions */
 687         u8 instrtype;           /* type of this instruction */
 688         u8 len;                 /* length of original instruction */
 689         u16 clobbers;           /* what registers you may clobber */
 690 };
 691
 692 extern struct paravirt_patch_site __parainstructions[],
 693         __parainstructions_end[];
 694
 695 #endif  /* __ASSEMBLY__ */
 696
 697 #endif  /* _ASM_X86_PARAVIRT_TYPES_H */