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