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 #include <asm/pgtable_types.h>
  45
  46 struct page;
  47 struct thread_struct;
  48 struct desc_ptr;
  49 struct tss_struct;
  50 struct mm_struct;
  51 struct desc_struct;
  52 struct task_struct;
  53 struct cpumask;
  54
  55 /*
  56  * Wrapper type for pointers to code which uses the non-standard
  57  * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
  58  */
  59 struct paravirt_callee_save {
  60         void *func;
  61 };
  62
  63 /* general info */
  64 struct pv_info {
  65         unsigned int kernel_rpl;
  66         int shared_kernel_pmd;
  67
  68 #ifdef CONFIG_X86_64
  69         u16 extra_user_64bit_cs;  /* __USER_CS if none */
  70 #endif
  71
  72         int paravirt_enabled;
  73         const char *name;
  74 };
  75
  76 struct pv_init_ops {
  77         /*
  78          * Patch may replace one of the defined code sequences with
  79          * arbitrary code, subject to the same register constraints.
  80          * This generally means the code is not free to clobber any
  81          * registers other than EAX.  The patch function should return
  82          * the number of bytes of code generated, as we nop pad the
  83          * rest in generic code.
  84          */
  85         unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
  86                           unsigned long addr, unsigned len);
  87 };
  88
  89
  90 struct pv_lazy_ops {
  91         /* Set deferred update mode, used for batching operations. */
  92         void (*enter)(void);
  93         void (*leave)(void);
  94         void (*flush)(void);
  95 };
  96
  97 struct pv_time_ops {
  98         unsigned long long (*sched_clock)(void);
  99         unsigned long long (*steal_clock)(int cpu);
 100         unsigned long (*get_tsc_khz)(void);
 101 };
 102
 103 struct pv_cpu_ops {
 104         /* hooks for various privileged instructions */
 105         unsigned long (*get_debugreg)(int regno);
 106         void (*set_debugreg)(int regno, unsigned long value);
 107
 108         void (*clts)(void);
 109
 110         unsigned long (*read_cr0)(void);
 111         void (*write_cr0)(unsigned long);
 112
 113         unsigned long (*read_cr4_safe)(void);
 114         unsigned long (*read_cr4)(void);
 115         void (*write_cr4)(unsigned long);
 116
 117 #ifdef CONFIG_X86_64
 118         unsigned long (*read_cr8)(void);
 119         void (*write_cr8)(unsigned long);
 120 #endif
 121
 122         /* Segment descriptor handling */
 123         void (*load_tr_desc)(void);
 124         void (*load_gdt)(const struct desc_ptr *);
 125         void (*load_idt)(const struct desc_ptr *);
 126         void (*store_gdt)(struct desc_ptr *);
 127         void (*store_idt)(struct desc_ptr *);
 128         void (*set_ldt)(const void *desc, unsigned entries);
 129         unsigned long (*store_tr)(void);
 130         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
 131 #ifdef CONFIG_X86_64
 132         void (*load_gs_index)(unsigned int idx);
 133 #endif
 134         void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
 135                                 const void *desc);
 136         void (*write_gdt_entry)(struct desc_struct *,
 137                                 int entrynum, const void *desc, int size);
 138         void (*write_idt_entry)(gate_desc *,
 139                                 int entrynum, const gate_desc *gate);
 140         void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
 141         void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
 142
 143         void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
 144
 145         void (*set_iopl_mask)(unsigned mask);
 146
 147         void (*wbinvd)(void);
 148         void (*io_delay)(void);
 149
 150         /* cpuid emulation, mostly so that caps bits can be disabled */
 151         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
 152                       unsigned int *ecx, unsigned int *edx);
 153
 154         /* MSR, PMC and TSR operations.
 155            err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
 156         u64 (*read_msr)(unsigned int msr, int *err);
 157         int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
 158
 159         u64 (*read_tsc)(void);
 160         u64 (*read_pmc)(int counter);
 161         unsigned long long (*read_tscp)(unsigned int *aux);
 162
 163         /*
 164          * Atomically enable interrupts and return to userspace.  This
 165          * is only ever used to return to 32-bit processes; in a
 166          * 64-bit kernel, it's used for 32-on-64 compat processes, but
 167          * never native 64-bit processes.  (Jump, not call.)
 168          */
 169         void (*irq_enable_sysexit)(void);
 170
 171         /*
 172          * Switch to usermode gs and return to 64-bit usermode using
 173          * sysret.  Only used in 64-bit kernels to return to 64-bit
 174          * processes.  Usermode register state, including %rsp, must
 175          * already be restored.
 176          */
 177         void (*usergs_sysret64)(void);
 178
 179         /*
 180          * Switch to usermode gs and return to 32-bit usermode using
 181          * sysret.  Used to return to 32-on-64 compat processes.
 182          * Other usermode register state, including %esp, must already
 183          * be restored.
 184          */
 185         void (*usergs_sysret32)(void);
 186
 187         /* Normal iret.  Jump to this with the standard iret stack
 188            frame set up. */
 189         void (*iret)(void);
 190
 191         void (*swapgs)(void);
 192
 193         void (*start_context_switch)(struct task_struct *prev);
 194         void (*end_context_switch)(struct task_struct *next);
 195 };
 196
 197 struct pv_irq_ops {
 198         /*
 199          * Get/set interrupt state.  save_fl and restore_fl are only
 200          * expected to use X86_EFLAGS_IF; all other bits
 201          * returned from save_fl are undefined, and may be ignored by
 202          * restore_fl.
 203          *
 204          * NOTE: These functions callers expect the callee to preserve
 205          * more registers than the standard C calling convention.
 206          */
 207         struct paravirt_callee_save save_fl;
 208         struct paravirt_callee_save restore_fl;
 209         struct paravirt_callee_save irq_disable;
 210         struct paravirt_callee_save irq_enable;
 211
 212         void (*safe_halt)(void);
 213         void (*halt)(void);
 214
 215 #ifdef CONFIG_X86_64
 216         void (*adjust_exception_frame)(void);
 217 #endif
 218 };
 219
 220 struct pv_apic_ops {
 221 #ifdef CONFIG_X86_LOCAL_APIC
 222         void (*startup_ipi_hook)(int phys_apicid,
 223                                  unsigned long start_eip,
 224                                  unsigned long start_esp);
 225 #endif
 226 };
 227
 228 struct pv_mmu_ops {
 229         unsigned long (*read_cr2)(void);
 230         void (*write_cr2)(unsigned long);
 231
 232         unsigned long (*read_cr3)(void);
 233         void (*write_cr3)(unsigned long);
 234
 235         /*
 236          * Hooks for intercepting the creation/use/destruction of an
 237          * mm_struct.
 238          */
 239         void (*activate_mm)(struct mm_struct *prev,
 240                             struct mm_struct *next);
 241         void (*dup_mmap)(struct mm_struct *oldmm,
 242                          struct mm_struct *mm);
 243         void (*exit_mmap)(struct mm_struct *mm);
 244
 245
 246         /* TLB operations */
 247         void (*flush_tlb_user)(void);
 248         void (*flush_tlb_kernel)(void);
 249         void (*flush_tlb_single)(unsigned long addr);
 250         void (*flush_tlb_others)(const struct cpumask *cpus,
 251                                  struct mm_struct *mm,
 252                                  unsigned long start,
 253                                  unsigned long end);
 254
 255         /* Hooks for allocating and freeing a pagetable top-level */
 256         int  (*pgd_alloc)(struct mm_struct *mm);
 257         void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
 258
 259         /*
 260          * Hooks for allocating/releasing pagetable pages when they're
 261          * attached to a pagetable
 262          */
 263         void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
 264         void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
 265         void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
 266         void (*release_pte)(unsigned long pfn);
 267         void (*release_pmd)(unsigned long pfn);
 268         void (*release_pud)(unsigned long pfn);
 269
 270         /* Pagetable manipulation functions */
 271         void (*set_pte)(pte_t *ptep, pte_t pteval);
 272         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
 273                            pte_t *ptep, pte_t pteval);
 274         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
 275         void (*set_pmd_at)(struct mm_struct *mm, unsigned long addr,
 276                            pmd_t *pmdp, pmd_t pmdval);
 277         void (*pte_update)(struct mm_struct *mm, unsigned long addr,
 278                            pte_t *ptep);
 279         void (*pte_update_defer)(struct mm_struct *mm,
 280                                  unsigned long addr, pte_t *ptep);
 281         void (*pmd_update)(struct mm_struct *mm, unsigned long addr,
 282                            pmd_t *pmdp);
 283         void (*pmd_update_defer)(struct mm_struct *mm,
 284                                  unsigned long addr, pmd_t *pmdp);
 285
 286         pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
 287                                         pte_t *ptep);
 288         void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
 289                                         pte_t *ptep, pte_t pte);
 290
 291         struct paravirt_callee_save pte_val;
 292         struct paravirt_callee_save make_pte;
 293
 294         struct paravirt_callee_save pgd_val;
 295         struct paravirt_callee_save make_pgd;
 296
 297 #if PAGETABLE_LEVELS >= 3
 298 #ifdef CONFIG_X86_PAE
 299         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
 300         void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
 301                           pte_t *ptep);
 302         void (*pmd_clear)(pmd_t *pmdp);
 303
 304 #endif  /* CONFIG_X86_PAE */
 305
 306         void (*set_pud)(pud_t *pudp, pud_t pudval);
 307
 308         struct paravirt_callee_save pmd_val;
 309         struct paravirt_callee_save make_pmd;
 310
 311 #if PAGETABLE_LEVELS == 4
 312         struct paravirt_callee_save pud_val;
 313         struct paravirt_callee_save make_pud;
 314
 315         void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
 316 #endif  /* PAGETABLE_LEVELS == 4 */
 317 #endif  /* PAGETABLE_LEVELS >= 3 */
 318
 319         struct pv_lazy_ops lazy_mode;
 320
 321         /* dom0 ops */
 322
 323         /* Sometimes the physical address is a pfn, and sometimes its
 324            an mfn.  We can tell which is which from the index. */
 325         void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
 326                            phys_addr_t phys, pgprot_t flags);
 327 };
 328
 329 struct arch_spinlock;
 330 struct pv_lock_ops {
 331         int (*spin_is_locked)(struct arch_spinlock *lock);
 332         int (*spin_is_contended)(struct arch_spinlock *lock);
 333         void (*spin_lock)(struct arch_spinlock *lock);
 334         void (*spin_lock_flags)(struct arch_spinlock *lock, unsigned long flags);
 335         int (*spin_trylock)(struct arch_spinlock *lock);
 336         void (*spin_unlock)(struct arch_spinlock *lock);
 337 };
 338
 339 /* This contains all the paravirt structures: we get a convenient
 340  * number for each function using the offset which we use to indicate
 341  * what to patch. */
 342 struct paravirt_patch_template {
 343         struct pv_init_ops pv_init_ops;
 344         struct pv_time_ops pv_time_ops;
 345         struct pv_cpu_ops pv_cpu_ops;
 346         struct pv_irq_ops pv_irq_ops;
 347         struct pv_apic_ops pv_apic_ops;
 348         struct pv_mmu_ops pv_mmu_ops;
 349         struct pv_lock_ops pv_lock_ops;
 350 };
 351
 352 extern struct pv_info pv_info;
 353 extern struct pv_init_ops pv_init_ops;
 354 extern struct pv_time_ops pv_time_ops;
 355 extern struct pv_cpu_ops pv_cpu_ops;
 356 extern struct pv_irq_ops pv_irq_ops;
 357 extern struct pv_apic_ops pv_apic_ops;
 358 extern struct pv_mmu_ops pv_mmu_ops;
 359 extern struct pv_lock_ops pv_lock_ops;
 360
 361 #define PARAVIRT_PATCH(x)                                       \
 362         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
 363
 364 #define paravirt_type(op)                               \
 365         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
 366         [paravirt_opptr] "i" (&(op))
 367 #define paravirt_clobber(clobber)               \
 368         [paravirt_clobber] "i" (clobber)
 369
 370 /*
 371  * Generate some code, and mark it as patchable by the
 372  * apply_paravirt() alternate instruction patcher.
 373  */
 374 #define _paravirt_alt(insn_string, type, clobber)       \
 375         "771:\n\t" insn_string "\n" "772:\n"            \
 376         ".pushsection .parainstructions,\"a\"\n"        \
 377         _ASM_ALIGN "\n"                                 \
 378         _ASM_PTR " 771b\n"                              \
 379         "  .byte " type "\n"                            \
 380         "  .byte 772b-771b\n"                           \
 381         "  .short " clobber "\n"                        \
 382         ".popsection\n"
 383
 384 /* Generate patchable code, with the default asm parameters. */
 385 #define paravirt_alt(insn_string)                                       \
 386         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
 387
 388 /* Simple instruction patching code. */
 389 #define DEF_NATIVE(ops, name, code)                                     \
 390         extern const char start_##ops##_##name[], end_##ops##_##name[]; \
 391         asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
 392
 393 unsigned paravirt_patch_nop(void);
 394 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
 395 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
 396 unsigned paravirt_patch_ignore(unsigned len);
 397 unsigned paravirt_patch_call(void *insnbuf,
 398                              const void *target, u16 tgt_clobbers,
 399                              unsigned long addr, u16 site_clobbers,
 400                              unsigned len);
 401 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
 402                             unsigned long addr, unsigned len);
 403 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
 404                                 unsigned long addr, unsigned len);
 405
 406 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
 407                               const char *start, const char *end);
 408
 409 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
 410                       unsigned long addr, unsigned len);
 411
 412 int paravirt_disable_iospace(void);
 413
 414 /*
 415  * This generates an indirect call based on the operation type number.
 416  * The type number, computed in PARAVIRT_PATCH, is derived from the
 417  * offset into the paravirt_patch_template structure, and can therefore be
 418  * freely converted back into a structure offset.
 419  */
 420 #define PARAVIRT_CALL   "call *%c[paravirt_opptr];"
 421
 422 /*
 423  * These macros are intended to wrap calls through one of the paravirt
 424  * ops structs, so that they can be later identified and patched at
 425  * runtime.
 426  *
 427  * Normally, a call to a pv_op function is a simple indirect call:
 428  * (pv_op_struct.operations)(args...).
 429  *
 430  * Unfortunately, this is a relatively slow operation for modern CPUs,
 431  * because it cannot necessarily determine what the destination
 432  * address is.  In this case, the address is a runtime constant, so at
 433  * the very least we can patch the call to e a simple direct call, or
 434  * ideally, patch an inline implementation into the callsite.  (Direct
 435  * calls are essentially free, because the call and return addresses
 436  * are completely predictable.)
 437  *
 438  * For i386, these macros rely on the standard gcc "regparm(3)" calling
 439  * convention, in which the first three arguments are placed in %eax,
 440  * %edx, %ecx (in that order), and the remaining arguments are placed
 441  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
 442  * to be modified (either clobbered or used for return values).
 443  * X86_64, on the other hand, already specifies a register-based calling
 444  * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
 445  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
 446  * special handling for dealing with 4 arguments, unlike i386.
 447  * However, x86_64 also have to clobber all caller saved registers, which
 448  * unfortunately, are quite a bit (r8 - r11)
 449  *
 450  * The call instruction itself is marked by placing its start address
 451  * and size into the .parainstructions section, so that
 452  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
 453  * appropriate patching under the control of the backend pv_init_ops
 454  * implementation.
 455  *
 456  * Unfortunately there's no way to get gcc to generate the args setup
 457  * for the call, and then allow the call itself to be generated by an
 458  * inline asm.  Because of this, we must do the complete arg setup and
 459  * return value handling from within these macros.  This is fairly
 460  * cumbersome.
 461  *
 462  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
 463  * It could be extended to more arguments, but there would be little
 464  * to be gained from that.  For each number of arguments, there are
 465  * the two VCALL and CALL variants for void and non-void functions.
 466  *
 467  * When there is a return value, the invoker of the macro must specify
 468  * the return type.  The macro then uses sizeof() on that type to
 469  * determine whether its a 32 or 64 bit value, and places the return
 470  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
 471  * 64-bit). For x86_64 machines, it just returns at %rax regardless of
 472  * the return value size.
 473  *
 474  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
 475  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
 476  * in low,high order
 477  *
 478  * Small structures are passed and returned in registers.  The macro
 479  * calling convention can't directly deal with this, so the wrapper
 480  * functions must do this.
 481  *
 482  * These PVOP_* macros are only defined within this header.  This
 483  * means that all uses must be wrapped in inline functions.  This also
 484  * makes sure the incoming and outgoing types are always correct.
 485  */
 486 #ifdef CONFIG_X86_32
 487 #define PVOP_VCALL_ARGS                         \
 488         unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
 489 #define PVOP_CALL_ARGS                  PVOP_VCALL_ARGS
 490
 491 #define PVOP_CALL_ARG1(x)               "a" ((unsigned long)(x))
 492 #define PVOP_CALL_ARG2(x)               "d" ((unsigned long)(x))
 493 #define PVOP_CALL_ARG3(x)               "c" ((unsigned long)(x))
 494
 495 #define PVOP_VCALL_CLOBBERS             "=a" (__eax), "=d" (__edx),     \
 496                                         "=c" (__ecx)
 497 #define PVOP_CALL_CLOBBERS              PVOP_VCALL_CLOBBERS
 498
 499 #define PVOP_VCALLEE_CLOBBERS           "=a" (__eax), "=d" (__edx)
 500 #define PVOP_CALLEE_CLOBBERS            PVOP_VCALLEE_CLOBBERS
 501
 502 #define EXTRA_CLOBBERS
 503 #define VEXTRA_CLOBBERS
 504 #else  /* CONFIG_X86_64 */
 505 /* [re]ax isn't an arg, but the return val */
 506 #define PVOP_VCALL_ARGS                                 \
 507         unsigned long __edi = __edi, __esi = __esi,     \
 508                 __edx = __edx, __ecx = __ecx, __eax = __eax
 509 #define PVOP_CALL_ARGS          PVOP_VCALL_ARGS
 510
 511 #define PVOP_CALL_ARG1(x)               "D" ((unsigned long)(x))
 512 #define PVOP_CALL_ARG2(x)               "S" ((unsigned long)(x))
 513 #define PVOP_CALL_ARG3(x)               "d" ((unsigned long)(x))
 514 #define PVOP_CALL_ARG4(x)               "c" ((unsigned long)(x))
 515
 516 #define PVOP_VCALL_CLOBBERS     "=D" (__edi),                           \
 517                                 "=S" (__esi), "=d" (__edx),             \
 518                                 "=c" (__ecx)
 519 #define PVOP_CALL_CLOBBERS      PVOP_VCALL_CLOBBERS, "=a" (__eax)
 520
 521 /* void functions are still allowed [re]ax for scratch */
 522 #define PVOP_VCALLEE_CLOBBERS   "=a" (__eax)
 523 #define PVOP_CALLEE_CLOBBERS    PVOP_VCALLEE_CLOBBERS
 524
 525 #define EXTRA_CLOBBERS   , "r8", "r9", "r10", "r11"
 526 #define VEXTRA_CLOBBERS  , "rax", "r8", "r9", "r10", "r11"
 527 #endif  /* CONFIG_X86_32 */
 528
 529 #ifdef CONFIG_PARAVIRT_DEBUG
 530 #define PVOP_TEST_NULL(op)      BUG_ON(op == NULL)
 531 #else
 532 #define PVOP_TEST_NULL(op)      ((void)op)
 533 #endif
 534
 535 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,         \
 536                       pre, post, ...)                                   \
 537         ({                                                              \
 538                 rettype __ret;                                          \
 539                 PVOP_CALL_ARGS;                                         \
 540                 PVOP_TEST_NULL(op);                                     \
 541                 /* This is 32-bit specific, but is okay in 64-bit */    \
 542                 /* since this condition will never hold */              \
 543                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
 544                         asm volatile(pre                                \
 545                                      paravirt_alt(PARAVIRT_CALL)        \
 546                                      post                               \
 547                                      : call_clbr                        \
 548                                      : paravirt_type(op),               \
 549                                        paravirt_clobber(clbr),          \
 550                                        ##__VA_ARGS__                    \
 551                                      : "memory", "cc" extra_clbr);      \
 552                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
 553                 } else {                                                \
 554                         asm volatile(pre                                \
 555                                      paravirt_alt(PARAVIRT_CALL)        \
 556                                      post                               \
 557                                      : call_clbr                        \
 558                                      : paravirt_type(op),               \
 559                                        paravirt_clobber(clbr),          \
 560                                        ##__VA_ARGS__                    \
 561                                      : "memory", "cc" extra_clbr);      \
 562                         __ret = (rettype)__eax;                         \
 563                 }                                                       \
 564                 __ret;                                                  \
 565         })
 566
 567 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
 568         ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,        \
 569                       EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
 570
 571 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)                  \
 572         ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
 573                       PVOP_CALLEE_CLOBBERS, ,                           \
 574                       pre, post, ##__VA_ARGS__)
 575
 576
 577 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
 578         ({                                                              \
 579                 PVOP_VCALL_ARGS;                                        \
 580                 PVOP_TEST_NULL(op);                                     \
 581                 asm volatile(pre                                        \
 582                              paravirt_alt(PARAVIRT_CALL)                \
 583                              post                                       \
 584                              : call_clbr                                \
 585                              : paravirt_type(op),                       \
 586                                paravirt_clobber(clbr),                  \
 587                                ##__VA_ARGS__                            \
 588                              : "memory", "cc" extra_clbr);              \
 589         })
 590
 591 #define __PVOP_VCALL(op, pre, post, ...)                                \
 592         ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,               \
 593                        VEXTRA_CLOBBERS,                                 \
 594                        pre, post, ##__VA_ARGS__)
 595
 596 #define __PVOP_VCALLEESAVE(op, pre, post, ...)                          \
 597         ____PVOP_VCALL(op.func, CLBR_RET_REG,                           \
 598                       PVOP_VCALLEE_CLOBBERS, ,                          \
 599                       pre, post, ##__VA_ARGS__)
 600
 601
 602
 603 #define PVOP_CALL0(rettype, op)                                         \
 604         __PVOP_CALL(rettype, op, "", "")
 605 #define PVOP_VCALL0(op)                                                 \
 606         __PVOP_VCALL(op, "", "")
 607
 608 #define PVOP_CALLEE0(rettype, op)                                       \
 609         __PVOP_CALLEESAVE(rettype, op, "", "")
 610 #define PVOP_VCALLEE0(op)                                               \
 611         __PVOP_VCALLEESAVE(op, "", "")
 612
 613
 614 #define PVOP_CALL1(rettype, op, arg1)                                   \
 615         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 616 #define PVOP_VCALL1(op, arg1)                                           \
 617         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
 618
 619 #define PVOP_CALLEE1(rettype, op, arg1)                                 \
 620         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
 621 #define PVOP_VCALLEE1(op, arg1)                                         \
 622         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
 623
 624
 625 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
 626         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 627                     PVOP_CALL_ARG2(arg2))
 628 #define PVOP_VCALL2(op, arg1, arg2)                                     \
 629         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 630                      PVOP_CALL_ARG2(arg2))
 631
 632 #define PVOP_CALLEE2(rettype, op, arg1, arg2)                           \
 633         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),    \
 634                           PVOP_CALL_ARG2(arg2))
 635 #define PVOP_VCALLEE2(op, arg1, arg2)                                   \
 636         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),            \
 637                            PVOP_CALL_ARG2(arg2))
 638
 639
 640 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
 641         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
 642                     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 643 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
 644         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
 645                      PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
 646
 647 /* This is the only difference in x86_64. We can make it much simpler */
 648 #ifdef CONFIG_X86_32
 649 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 650         __PVOP_CALL(rettype, op,                                        \
 651                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 652                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 653                     PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
 654 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 655         __PVOP_VCALL(op,                                                \
 656                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 657                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
 658                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
 659 #else
 660 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 661         __PVOP_CALL(rettype, op, "", "",                                \
 662                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
 663                     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 664 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 665         __PVOP_VCALL(op, "", "",                                        \
 666                      PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),        \
 667                      PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
 668 #endif
 669
 670 /* Lazy mode for batching updates / context switch */
 671 enum paravirt_lazy_mode {
 672         PARAVIRT_LAZY_NONE,
 673         PARAVIRT_LAZY_MMU,
 674         PARAVIRT_LAZY_CPU,
 675 };
 676
 677 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
 678 void paravirt_start_context_switch(struct task_struct *prev);
 679 void paravirt_end_context_switch(struct task_struct *next);
 680
 681 void paravirt_enter_lazy_mmu(void);
 682 void paravirt_leave_lazy_mmu(void);
 683 void paravirt_flush_lazy_mmu(void);
 684
 685 void _paravirt_nop(void);
 686 u32 _paravirt_ident_32(u32);
 687 u64 _paravirt_ident_64(u64);
 688
 689 #define paravirt_nop    ((void *)_paravirt_nop)
 690
 691 /* These all sit in the .parainstructions section to tell us what to patch. */
 692 struct paravirt_patch_site {
 693         u8 *instr;              /* original instructions */
 694         u8 instrtype;           /* type of this instruction */
 695         u8 len;                 /* length of original instruction */
 696         u16 clobbers;           /* what registers you may clobber */
 697 };
 698
 699 extern struct paravirt_patch_site __parainstructions[],
 700         __parainstructions_end[];
 701
 702 #endif  /* __ASSEMBLY__ */
 703
 704 #endif  /* _ASM_X86_PARAVIRT_TYPES_H */