release/src-rt-6.x.4708/linux/linux-2.6.36/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 (*get_tsc_khz)(void);
  93 };
  94
  95 struct pv_cpu_ops {
  96         /* hooks for various privileged instructions */
  97         unsigned long (*get_debugreg)(int regno);
  98         void (*set_debugreg)(int regno, unsigned long value);
  99
 100         void (*clts)(void);
 101
 102         unsigned long (*read_cr0)(void);
 103         void (*write_cr0)(unsigned long);
 104
 105         unsigned long (*read_cr4_safe)(void);
 106         unsigned long (*read_cr4)(void);
 107         void (*write_cr4)(unsigned long);
 108
 109 #ifdef CONFIG_X86_64
 110         unsigned long (*read_cr8)(void);
 111         void (*write_cr8)(unsigned long);
 112 #endif
 113
 114         /* Segment descriptor handling */
 115         void (*load_tr_desc)(void);
 116         void (*load_gdt)(const struct desc_ptr *);
 117         void (*load_idt)(const struct desc_ptr *);
 118         void (*store_gdt)(struct desc_ptr *);
 119         void (*store_idt)(struct desc_ptr *);
 120         void (*set_ldt)(const void *desc, unsigned entries);
 121         unsigned long (*store_tr)(void);
 122         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
 123 #ifdef CONFIG_X86_64
 124         void (*load_gs_index)(unsigned int idx);
 125 #endif
 126         void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
 127                                 const void *desc);
 128         void (*write_gdt_entry)(struct desc_struct *,
 129                                 int entrynum, const void *desc, int size);
 130         void (*write_idt_entry)(gate_desc *,
 131                                 int entrynum, const gate_desc *gate);
 132         void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
 133         void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
 134
 135         void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
 136
 137         void (*set_iopl_mask)(unsigned mask);
 138
 139         void (*wbinvd)(void);
 140         void (*io_delay)(void);
 141
 142         /* cpuid emulation, mostly so that caps bits can be disabled */
 143         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
 144                       unsigned int *ecx, unsigned int *edx);
 145
 146         /* MSR, PMC and TSR operations.
 147            err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
 148         u64 (*read_msr)(unsigned int msr, int *err);
 149         int (*rdmsr_regs)(u32 *regs);
 150         int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
 151         int (*wrmsr_regs)(u32 *regs);
 152
 153         u64 (*read_tsc)(void);
 154         u64 (*read_pmc)(int counter);
 155         unsigned long long (*read_tscp)(unsigned int *aux);
 156
 157         /*
 158          * Atomically enable interrupts and return to userspace.  This
 159          * is only ever used to return to 32-bit processes; in a
 160          * 64-bit kernel, it's used for 32-on-64 compat processes, but
 161          * never native 64-bit processes.  (Jump, not call.)
 162          */
 163         void (*irq_enable_sysexit)(void);
 164
 165         /*
 166          * Switch to usermode gs and return to 64-bit usermode using
 167          * sysret.  Only used in 64-bit kernels to return to 64-bit
 168          * processes.  Usermode register state, including %rsp, must
 169          * already be restored.
 170          */
 171         void (*usergs_sysret64)(void);
 172
 173         /*
 174          * Switch to usermode gs and return to 32-bit usermode using
 175          * sysret.  Used to return to 32-on-64 compat processes.
 176          * Other usermode register state, including %esp, must already
 177          * be restored.
 178          */
 179         void (*usergs_sysret32)(void);
 180
 181         /* Normal iret.  Jump to this with the standard iret stack
 182            frame set up. */
 183         void (*iret)(void);
 184
 185         void (*swapgs)(void);
 186
 187         void (*start_context_switch)(struct task_struct *prev);
 188         void (*end_context_switch)(struct task_struct *next);
 189 };
 190
 191 struct pv_irq_ops {
 192         /*
 193          * Get/set interrupt state.  save_fl and restore_fl are only
 194          * expected to use X86_EFLAGS_IF; all other bits
 195          * returned from save_fl are undefined, and may be ignored by
 196          * restore_fl.
 197          *
 198          * NOTE: These functions callers expect the callee to preserve
 199          * more registers than the standard C calling convention.
 200          */
 201         struct paravirt_callee_save save_fl;
 202         struct paravirt_callee_save restore_fl;
 203         struct paravirt_callee_save irq_disable;
 204         struct paravirt_callee_save irq_enable;
 205
 206         void (*safe_halt)(void);
 207         void (*halt)(void);
 208
 209 #ifdef CONFIG_X86_64
 210         void (*adjust_exception_frame)(void);
 211 #endif
 212 };
 213
 214 struct pv_apic_ops {
 215 #ifdef CONFIG_X86_LOCAL_APIC
 216         void (*startup_ipi_hook)(int phys_apicid,
 217                                  unsigned long start_eip,
 218                                  unsigned long start_esp);
 219 #endif
 220 };
 221
 222 struct pv_mmu_ops {
 223         unsigned long (*read_cr2)(void);
 224         void (*write_cr2)(unsigned long);
 225
 226         unsigned long (*read_cr3)(void);
 227         void (*write_cr3)(unsigned long);
 228
 229         /*
 230          * Hooks for intercepting the creation/use/destruction of an
 231          * mm_struct.
 232          */
 233         void (*activate_mm)(struct mm_struct *prev,
 234                             struct mm_struct *next);
 235         void (*dup_mmap)(struct mm_struct *oldmm,
 236                          struct mm_struct *mm);
 237         void (*exit_mmap)(struct mm_struct *mm);
 238
 239
 240         /* TLB operations */
 241         void (*flush_tlb_user)(void);
 242         void (*flush_tlb_kernel)(void);
 243         void (*flush_tlb_single)(unsigned long addr);
 244         void (*flush_tlb_others)(const struct cpumask *cpus,
 245                                  struct mm_struct *mm,
 246                                  unsigned long va);
 247
 248         /* Hooks for allocating and freeing a pagetable top-level */
 249         int  (*pgd_alloc)(struct mm_struct *mm);
 250         void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
 251
 252         /*
 253          * Hooks for allocating/releasing pagetable pages when they're
 254          * attached to a pagetable
 255          */
 256         void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
 257         void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
 258         void (*alloc_pmd_clone)(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count);
 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 (*pte_update)(struct mm_struct *mm, unsigned long addr,
 270                            pte_t *ptep);
 271         void (*pte_update_defer)(struct mm_struct *mm,
 272                                  unsigned long addr, pte_t *ptep);
 273
 274         pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
 275                                         pte_t *ptep);
 276         void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
 277                                         pte_t *ptep, pte_t pte);
 278
 279         struct paravirt_callee_save pte_val;
 280         struct paravirt_callee_save make_pte;
 281
 282         struct paravirt_callee_save pgd_val;
 283         struct paravirt_callee_save make_pgd;
 284
 285 #if PAGETABLE_LEVELS >= 3
 286 #ifdef CONFIG_X86_PAE
 287         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
 288         void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
 289                           pte_t *ptep);
 290         void (*pmd_clear)(pmd_t *pmdp);
 291
 292 #endif  /* CONFIG_X86_PAE */
 293
 294         void (*set_pud)(pud_t *pudp, pud_t pudval);
 295
 296         struct paravirt_callee_save pmd_val;
 297         struct paravirt_callee_save make_pmd;
 298
 299 #if PAGETABLE_LEVELS == 4
 300         struct paravirt_callee_save pud_val;
 301         struct paravirt_callee_save make_pud;
 302
 303         void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
 304 #endif  /* PAGETABLE_LEVELS == 4 */
 305 #endif  /* PAGETABLE_LEVELS >= 3 */
 306
 307         struct pv_lazy_ops lazy_mode;
 308
 309         /* dom0 ops */
 310
 311         /* Sometimes the physical address is a pfn, and sometimes its
 312            an mfn.  We can tell which is which from the index. */
 313         void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
 314                            phys_addr_t phys, pgprot_t flags);
 315 };
 316
 317 struct arch_spinlock;
 318 struct pv_lock_ops {
 319         int (*spin_is_locked)(struct arch_spinlock *lock);
 320         int (*spin_is_contended)(struct arch_spinlock *lock);
 321         void (*spin_lock)(struct arch_spinlock *lock);
 322         void (*spin_lock_flags)(struct arch_spinlock *lock, unsigned long flags);
 323         int (*spin_trylock)(struct arch_spinlock *lock);
 324         void (*spin_unlock)(struct arch_spinlock *lock);
 325 };
 326
 327 /* This contains all the paravirt structures: we get a convenient
 328  * number for each function using the offset which we use to indicate
 329  * what to patch. */
 330 struct paravirt_patch_template {
 331         struct pv_init_ops pv_init_ops;
 332         struct pv_time_ops pv_time_ops;
 333         struct pv_cpu_ops pv_cpu_ops;
 334         struct pv_irq_ops pv_irq_ops;
 335         struct pv_apic_ops pv_apic_ops;
 336         struct pv_mmu_ops pv_mmu_ops;
 337         struct pv_lock_ops pv_lock_ops;
 338 };
 339
 340 extern struct pv_info pv_info;
 341 extern struct pv_init_ops pv_init_ops;
 342 extern struct pv_time_ops pv_time_ops;
 343 extern struct pv_cpu_ops pv_cpu_ops;
 344 extern struct pv_irq_ops pv_irq_ops;
 345 extern struct pv_apic_ops pv_apic_ops;
 346 extern struct pv_mmu_ops pv_mmu_ops;
 347 extern struct pv_lock_ops pv_lock_ops;
 348
 349 #define PARAVIRT_PATCH(x)                                       \
 350         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
 351
 352 #define paravirt_type(op)                               \
 353         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
 354         [paravirt_opptr] "i" (&(op))
 355 #define paravirt_clobber(clobber)               \
 356         [paravirt_clobber] "i" (clobber)
 357
 358 /*
 359  * Generate some code, and mark it as patchable by the
 360  * apply_paravirt() alternate instruction patcher.
 361  */
 362 #define _paravirt_alt(insn_string, type, clobber)       \
 363         "771:\n\t" insn_string "\n" "772:\n"            \
 364         ".pushsection .parainstructions,\"a\"\n"        \
 365         _ASM_ALIGN "\n"                                 \
 366         _ASM_PTR " 771b\n"                              \
 367         "  .byte " type "\n"                            \
 368         "  .byte 772b-771b\n"                           \
 369         "  .short " clobber "\n"                        \
 370         ".popsection\n"
 371
 372 /* Generate patchable code, with the default asm parameters. */
 373 #define paravirt_alt(insn_string)                                       \
 374         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
 375
 376 /* Simple instruction patching code. */
 377 #define DEF_NATIVE(ops, name, code)                                     \
 378         extern const char start_##ops##_##name[], end_##ops##_##name[]; \
 379         asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
 380
 381 unsigned paravirt_patch_nop(void);
 382 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
 383 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
 384 unsigned paravirt_patch_ignore(unsigned len);
 385 unsigned paravirt_patch_call(void *insnbuf,
 386                              const void *target, u16 tgt_clobbers,
 387                              unsigned long addr, u16 site_clobbers,
 388                              unsigned len);
 389 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
 390                             unsigned long addr, unsigned len);
 391 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
 392                                 unsigned long addr, unsigned len);
 393
 394 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
 395                               const char *start, const char *end);
 396
 397 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
 398                       unsigned long addr, unsigned len);
 399
 400 int paravirt_disable_iospace(void);
 401
 402 /*
 403  * This generates an indirect call based on the operation type number.
 404  * The type number, computed in PARAVIRT_PATCH, is derived from the
 405  * offset into the paravirt_patch_template structure, and can therefore be
 406  * freely converted back into a structure offset.
 407  */
 408 #define PARAVIRT_CALL   "call *%c[paravirt_opptr];"
 409
 410 /*
 411  * These macros are intended to wrap calls through one of the paravirt
 412  * ops structs, so that they can be later identified and patched at
 413  * runtime.
 414  *
 415  * Normally, a call to a pv_op function is a simple indirect call:
 416  * (pv_op_struct.operations)(args...).
 417  *
 418  * Unfortunately, this is a relatively slow operation for modern CPUs,
 419  * because it cannot necessarily determine what the destination
 420  * address is.  In this case, the address is a runtime constant, so at
 421  * the very least we can patch the call to e a simple direct call, or
 422  * ideally, patch an inline implementation into the callsite.  (Direct
 423  * calls are essentially free, because the call and return addresses
 424  * are completely predictable.)
 425  *
 426  * For i386, these macros rely on the standard gcc "regparm(3)" calling
 427  * convention, in which the first three arguments are placed in %eax,
 428  * %edx, %ecx (in that order), and the remaining arguments are placed
 429  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
 430  * to be modified (either clobbered or used for return values).
 431  * X86_64, on the other hand, already specifies a register-based calling
 432  * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
 433  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
 434  * special handling for dealing with 4 arguments, unlike i386.
 435  * However, x86_64 also have to clobber all caller saved registers, which
 436  * unfortunately, are quite a bit (r8 - r11)
 437  *
 438  * The call instruction itself is marked by placing its start address
 439  * and size into the .parainstructions section, so that
 440  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
 441  * appropriate patching under the control of the backend pv_init_ops
 442  * implementation.
 443  *
 444  * Unfortunately there's no way to get gcc to generate the args setup
 445  * for the call, and then allow the call itself to be generated by an
 446  * inline asm.  Because of this, we must do the complete arg setup and
 447  * return value handling from within these macros.  This is fairly
 448  * cumbersome.
 449  *
 450  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
 451  * It could be extended to more arguments, but there would be little
 452  * to be gained from that.  For each number of arguments, there are
 453  * the two VCALL and CALL variants for void and non-void functions.
 454  *
 455  * When there is a return value, the invoker of the macro must specify
 456  * the return type.  The macro then uses sizeof() on that type to
 457  * determine whether its a 32 or 64 bit value, and places the return
 458  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
 459  * 64-bit). For x86_64 machines, it just returns at %rax regardless of
 460  * the return value size.
 461  *
 462  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
 463  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
 464  * in low,high order
 465  *
 466  * Small structures are passed and returned in registers.  The macro
 467  * calling convention can't directly deal with this, so the wrapper
 468  * functions must do this.
 469  *
 470  * These PVOP_* macros are only defined within this header.  This
 471  * means that all uses must be wrapped in inline functions.  This also
 472  * makes sure the incoming and outgoing types are always correct.
 473  */
 474 #ifdef CONFIG_X86_32
 475 #define PVOP_VCALL_ARGS                         \
 476         unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
 477 #define PVOP_CALL_ARGS                  PVOP_VCALL_ARGS
 478
 479 #define PVOP_CALL_ARG1(x)               "a" ((unsigned long)(x))
 480 #define PVOP_CALL_ARG2(x)               "d" ((unsigned long)(x))
 481 #define PVOP_CALL_ARG3(x)               "c" ((unsigned long)(x))
 482
 483 #define PVOP_VCALL_CLOBBERS             "=a" (__eax), "=d" (__edx),     \
 484                                         "=c" (__ecx)
 485 #define PVOP_CALL_CLOBBERS              PVOP_VCALL_CLOBBERS
 486
 487 #define PVOP_VCALLEE_CLOBBERS           "=a" (__eax), "=d" (__edx)
 488 #define PVOP_CALLEE_CLOBBERS            PVOP_VCALLEE_CLOBBERS
 489
 490 #define EXTRA_CLOBBERS
 491 #define VEXTRA_CLOBBERS
 492 #else  /* CONFIG_X86_64 */
 493 /* [re]ax isn't an arg, but the return val */
 494 #define PVOP_VCALL_ARGS                                 \
 495         unsigned long __edi = __edi, __esi = __esi,     \
 496                 __edx = __edx, __ecx = __ecx, __eax = __eax
 497 #define PVOP_CALL_ARGS          PVOP_VCALL_ARGS
 498
 499 #define PVOP_CALL_ARG1(x)               "D" ((unsigned long)(x))
 500 #define PVOP_CALL_ARG2(x)               "S" ((unsigned long)(x))
 501 #define PVOP_CALL_ARG3(x)               "d" ((unsigned long)(x))
 502 #define PVOP_CALL_ARG4(x)               "c" ((unsigned long)(x))
 503
 504 #define PVOP_VCALL_CLOBBERS     "=D" (__edi),                           \
 505                                 "=S" (__esi), "=d" (__edx),             \
 506                                 "=c" (__ecx)
 507 #define PVOP_CALL_CLOBBERS      PVOP_VCALL_CLOBBERS, "=a" (__eax)
 508
 509 /* void functions are still allowed [re]ax for scratch */
 510 #define PVOP_VCALLEE_CLOBBERS   "=a" (__eax)
 511 #define PVOP_CALLEE_CLOBBERS    PVOP_VCALLEE_CLOBBERS
 512
 513 #define EXTRA_CLOBBERS   , "r8", "r9", "r10", "r11"
 514 #define VEXTRA_CLOBBERS  , "rax", "r8", "r9", "r10", "r11"
 515 #endif  /* CONFIG_X86_32 */
 516
 517 #ifdef CONFIG_PARAVIRT_DEBUG
 518 #define PVOP_TEST_NULL(op)      BUG_ON(op == NULL)
 519 #else
 520 #define PVOP_TEST_NULL(op)      ((void)op)
 521 #endif
 522
 523 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,         \
 524                       pre, post, ...)                                   \
 525         ({                                                              \
 526                 rettype __ret;                                          \
 527                 PVOP_CALL_ARGS;                                         \
 528                 PVOP_TEST_NULL(op);                                     \
 529                 /* This is 32-bit specific, but is okay in 64-bit */    \
 530                 /* since this condition will never hold */              \
 531                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
 532                         asm volatile(pre                                \
 533                                      paravirt_alt(PARAVIRT_CALL)        \
 534                                      post                               \
 535                                      : call_clbr                        \
 536                                      : paravirt_type(op),               \
 537                                        paravirt_clobber(clbr),          \
 538                                        ##__VA_ARGS__                    \
 539                                      : "memory", "cc" extra_clbr);      \
 540                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
 541                 } else {                                                \
 542                         asm volatile(pre                                \
 543                                      paravirt_alt(PARAVIRT_CALL)        \
 544                                      post                               \
 545                                      : call_clbr                        \
 546                                      : paravirt_type(op),               \
 547                                        paravirt_clobber(clbr),          \
 548                                        ##__VA_ARGS__                    \
 549                                      : "memory", "cc" extra_clbr);      \
 550                         __ret = (rettype)__eax;                         \
 551                 }                                                       \
 552                 __ret;                                                  \
 553         })
 554
 555 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
 556         ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,        \
 557                       EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
 558
 559 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)                  \
 560         ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
 561                       PVOP_CALLEE_CLOBBERS, ,                           \
 562                       pre, post, ##__VA_ARGS__)
 563
 564
 565 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
 566         ({                                                              \
 567                 PVOP_VCALL_ARGS;                                        \
 568                 PVOP_TEST_NULL(op);                                     \
 569                 asm volatile(pre                                        \
 570                              paravirt_alt(PARAVIRT_CALL)                \
 571                              post                                       \
 572                              : call_clbr                                \
 573                              : paravirt_type(op),                       \
 574                                paravirt_clobber(clbr),                  \
 575                                ##__VA_ARGS__                            \
 576                              : "memory", "cc" extra_clbr);              \
 577         })
 578
 579 #define __PVOP_VCALL(op, pre, post, ...)                                \
 580         ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,               \
 581                        VEXTRA_CLOBBERS,                                 \
 582                        pre, post, ##__VA_ARGS__)
 583
 584 #define __PVOP_VCALLEESAVE(op, pre, post, ...)                          \
 585         ____PVOP_VCALL(op.func, CLBR_RET_REG,                           \
 586                       PVOP_VCALLEE_CLOBBERS, ,                          \
 587                       pre, post, ##__VA_ARGS__)
 588
 589
 590
 591 #define PVOP_CALL0(rettype, op)                                         \
 592         __PVOP_CALL(rettype, op, "", "")
 593 #define PVOP_VCALL0(op)                                                 \
 594         __PVOP_VCALL(op, "", "")
 595
 596 #define PVOP_CALLEE0(rettype, op)                                       \
 597         __PVOP_CALLEESAVE(rettype, op, "", "")
 598 #define PVOP_VCALLEE0(op)                                               \
 599         __PVOP_VCALLEESAVE(op, "", "")
 600
 601
 602 #define PVOP_CALL1(rettype, op, arg1)                                   \
 603         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 604 #define PVOP_VCALL1(op, arg1)                                           \
 605         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
 606
 607 #define PVOP_CALLEE1(rettype, op, arg1)                                 \
 608         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 609 #define PVOP_VCALLEE1(op, arg1)                                         \
 610         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
 611
 612
 613 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
 614         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 615                     PVOP_CALL_ARG2(arg2))
 616 #define PVOP_VCALL2(op, arg1, arg2)                                     \
 617         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 618                      PVOP_CALL_ARG2(arg2))
 619
 620 #define PVOP_CALLEE2(rettype, op, arg1, arg2)                           \
 621         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),    \
 622                           PVOP_CALL_ARG2(arg2))
 623 #define PVOP_VCALLEE2(op, arg1, arg2)                                   \
 624         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),            \
 625                            PVOP_CALL_ARG2(arg2))
 626
 627
 628 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
 629         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 630                     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 631 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
 632         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 633                      PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 634
 635 /* This is the only difference in x86_64. We can make it much simpler */
 636 #ifdef CONFIG_X86_32
 637 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 638         __PVOP_CALL(rettype, op,                                        \
 639                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 640                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 641                     PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
 642 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 643         __PVOP_VCALL(op,                                                \
 644                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 645                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
 646                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
 647 #else
 648 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 649         __PVOP_CALL(rettype, op, "", "",                                \
 650                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 651                     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 652 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 653         __PVOP_VCALL(op, "", "",                                        \
 654                      PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),        \
 655                      PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 656 #endif
 657
 658 /* Lazy mode for batching updates / context switch */
 659 enum paravirt_lazy_mode {
 660         PARAVIRT_LAZY_NONE,
 661         PARAVIRT_LAZY_MMU,
 662         PARAVIRT_LAZY_CPU,
 663 };
 664
 665 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
 666 void paravirt_start_context_switch(struct task_struct *prev);
 667 void paravirt_end_context_switch(struct task_struct *next);
 668
 669 void paravirt_enter_lazy_mmu(void);
 670 void paravirt_leave_lazy_mmu(void);
 671
 672 void _paravirt_nop(void);
 673 u32 _paravirt_ident_32(u32);
 674 u64 _paravirt_ident_64(u64);
 675
 676 #define paravirt_nop    ((void *)_paravirt_nop)
 677
 678 /* These all sit in the .parainstructions section to tell us what to patch. */
 679 struct paravirt_patch_site {
 680         u8 *instr;              /* original instructions */
 681         u8 instrtype;           /* type of this instruction */
 682         u8 len;                 /* length of original instruction */
 683         u16 clobbers;           /* what registers you may clobber */
 684 };
 685
 686 extern struct paravirt_patch_site __parainstructions[],
 687         __parainstructions_end[];
 688
 689 #endif  /* __ASSEMBLY__ */
 690
 691 #endif  /* _ASM_X86_PARAVIRT_TYPES_H */