include/asm-x86/paravirt.h

   1 #ifndef __ASM_PARAVIRT_H
   2 #define __ASM_PARAVIRT_H
   3 /* Various instructions on x86 need to be replaced for
   4  * para-virtualization: those hooks are defined here. */
   5
   6 #ifdef CONFIG_PARAVIRT
   7 #include <asm/page.h>
   8
   9 /* Bitmask of what can be clobbered: usually at least eax. */
  10 #define CLBR_NONE 0x0
  11 #define CLBR_EAX 0x1
  12 #define CLBR_ECX 0x2
  13 #define CLBR_EDX 0x4
  14 #define CLBR_ANY 0x7
  15
  16 #ifndef __ASSEMBLY__
  17 #include <linux/types.h>
  18 #include <linux/cpumask.h>
  19 #include <asm/kmap_types.h>
  20
  21 struct page;
  22 struct thread_struct;
  23 struct Xgt_desc_struct;
  24 struct tss_struct;
  25 struct mm_struct;
  26 struct desc_struct;
  27
  28 /* Lazy mode for batching updates / context switch */
  29 enum paravirt_lazy_mode {
  30         PARAVIRT_LAZY_NONE = 0,
  31         PARAVIRT_LAZY_MMU = 1,
  32         PARAVIRT_LAZY_CPU = 2,
  33         PARAVIRT_LAZY_FLUSH = 3,
  34 };
  35
  36 struct paravirt_ops
  37 {
  38         unsigned int kernel_rpl;
  39         int shared_kernel_pmd;
  40         int paravirt_enabled;
  41         const char *name;
  42
  43         /*
  44          * Patch may replace one of the defined code sequences with arbitrary
  45          * code, subject to the same register constraints.  This generally
  46          * means the code is not free to clobber any registers other than EAX.
  47          * The patch function should return the number of bytes of code
  48          * generated, as we nop pad the rest in generic code.
  49          */
  50         unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
  51                           unsigned long addr, unsigned len);
  52
  53         /* Basic arch-specific setup */
  54         void (*arch_setup)(void);
  55         char *(*memory_setup)(void);
  56         void (*post_allocator_init)(void);
  57
  58         void (*init_IRQ)(void);
  59         void (*time_init)(void);
  60
  61         /*
  62          * Called before/after init_mm pagetable setup. setup_start
  63          * may reset %cr3, and may pre-install parts of the pagetable;
  64          * pagetable setup is expected to preserve any existing
  65          * mapping.
  66          */
  67         void (*pagetable_setup_start)(pgd_t *pgd_base);
  68         void (*pagetable_setup_done)(pgd_t *pgd_base);
  69
  70         /* Print a banner to identify the environment */
  71         void (*banner)(void);
  72
  73         /* Set and set time of day */
  74         unsigned long (*get_wallclock)(void);
  75         int (*set_wallclock)(unsigned long);
  76
  77         /* cpuid emulation, mostly so that caps bits can be disabled */
  78         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
  79                       unsigned int *ecx, unsigned int *edx);
  80
  81         /* hooks for various privileged instructions */
  82         unsigned long (*get_debugreg)(int regno);
  83         void (*set_debugreg)(int regno, unsigned long value);
  84
  85         void (*clts)(void);
  86
  87         unsigned long (*read_cr0)(void);
  88         void (*write_cr0)(unsigned long);
  89
  90         unsigned long (*read_cr2)(void);
  91         void (*write_cr2)(unsigned long);
  92
  93         unsigned long (*read_cr3)(void);
  94         void (*write_cr3)(unsigned long);
  95
  96         unsigned long (*read_cr4_safe)(void);
  97         unsigned long (*read_cr4)(void);
  98         void (*write_cr4)(unsigned long);
  99
 100         /*
 101          * Get/set interrupt state.  save_fl and restore_fl are only
 102          * expected to use X86_EFLAGS_IF; all other bits
 103          * returned from save_fl are undefined, and may be ignored by
 104          * restore_fl.
 105          */
 106         unsigned long (*save_fl)(void);
 107         void (*restore_fl)(unsigned long);
 108         void (*irq_disable)(void);
 109         void (*irq_enable)(void);
 110         void (*safe_halt)(void);
 111         void (*halt)(void);
 112
 113         void (*wbinvd)(void);
 114
 115         /* MSR, PMC and TSR operations.
 116            err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
 117         u64 (*read_msr)(unsigned int msr, int *err);
 118         int (*write_msr)(unsigned int msr, u64 val);
 119
 120         u64 (*read_tsc)(void);
 121         u64 (*read_pmc)(void);
 122         unsigned long long (*sched_clock)(void);
 123         unsigned long (*get_cpu_khz)(void);
 124
 125         /* Segment descriptor handling */
 126         void (*load_tr_desc)(void);
 127         void (*load_gdt)(const struct Xgt_desc_struct *);
 128         void (*load_idt)(const struct Xgt_desc_struct *);
 129         void (*store_gdt)(struct Xgt_desc_struct *);
 130         void (*store_idt)(struct Xgt_desc_struct *);
 131         void (*set_ldt)(const void *desc, unsigned entries);
 132         unsigned long (*store_tr)(void);
 133         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
 134         void (*write_ldt_entry)(struct desc_struct *,
 135                                 int entrynum, u32 low, u32 high);
 136         void (*write_gdt_entry)(struct desc_struct *,
 137                                 int entrynum, u32 low, u32 high);
 138         void (*write_idt_entry)(struct desc_struct *,
 139                                 int entrynum, u32 low, u32 high);
 140         void (*load_esp0)(struct tss_struct *tss, struct thread_struct *t);
 141
 142         void (*set_iopl_mask)(unsigned mask);
 143         void (*io_delay)(void);
 144
 145         /*
 146          * Hooks for intercepting the creation/use/destruction of an
 147          * mm_struct.
 148          */
 149         void (*activate_mm)(struct mm_struct *prev,
 150                             struct mm_struct *next);
 151         void (*dup_mmap)(struct mm_struct *oldmm,
 152                          struct mm_struct *mm);
 153         void (*exit_mmap)(struct mm_struct *mm);
 154
 155 #ifdef CONFIG_X86_LOCAL_APIC
 156         /*
 157          * Direct APIC operations, principally for VMI.  Ideally
 158          * these shouldn't be in this interface.
 159          */
 160         void (*apic_write)(unsigned long reg, unsigned long v);
 161         void (*apic_write_atomic)(unsigned long reg, unsigned long v);
 162         unsigned long (*apic_read)(unsigned long reg);
 163         void (*setup_boot_clock)(void);
 164         void (*setup_secondary_clock)(void);
 165
 166         void (*startup_ipi_hook)(int phys_apicid,
 167                                  unsigned long start_eip,
 168                                  unsigned long start_esp);
 169 #endif
 170
 171         /* TLB operations */
 172         void (*flush_tlb_user)(void);
 173         void (*flush_tlb_kernel)(void);
 174         void (*flush_tlb_single)(unsigned long addr);
 175         void (*flush_tlb_others)(const cpumask_t *cpus, struct mm_struct *mm,
 176                                  unsigned long va);
 177
 178         /* Hooks for allocating/releasing pagetable pages */
 179         void (*alloc_pt)(struct mm_struct *mm, u32 pfn);
 180         void (*alloc_pd)(u32 pfn);
 181         void (*alloc_pd_clone)(u32 pfn, u32 clonepfn, u32 start, u32 count);
 182         void (*release_pt)(u32 pfn);
 183         void (*release_pd)(u32 pfn);
 184
 185         /* Pagetable manipulation functions */
 186         void (*set_pte)(pte_t *ptep, pte_t pteval);
 187         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
 188                            pte_t *ptep, pte_t pteval);
 189         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
 190         void (*pte_update)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
 191         void (*pte_update_defer)(struct mm_struct *mm,
 192                                  unsigned long addr, pte_t *ptep);
 193
 194 #ifdef CONFIG_HIGHPTE
 195         void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
 196 #endif
 197
 198 #ifdef CONFIG_X86_PAE
 199         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
 200         void (*set_pte_present)(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte);
 201         void (*set_pud)(pud_t *pudp, pud_t pudval);
 202         void (*pte_clear)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
 203         void (*pmd_clear)(pmd_t *pmdp);
 204
 205         unsigned long long (*pte_val)(pte_t);
 206         unsigned long long (*pmd_val)(pmd_t);
 207         unsigned long long (*pgd_val)(pgd_t);
 208
 209         pte_t (*make_pte)(unsigned long long pte);
 210         pmd_t (*make_pmd)(unsigned long long pmd);
 211         pgd_t (*make_pgd)(unsigned long long pgd);
 212 #else
 213         unsigned long (*pte_val)(pte_t);
 214         unsigned long (*pgd_val)(pgd_t);
 215
 216         pte_t (*make_pte)(unsigned long pte);
 217         pgd_t (*make_pgd)(unsigned long pgd);
 218 #endif
 219
 220         /* Set deferred update mode, used for batching operations. */
 221         void (*set_lazy_mode)(enum paravirt_lazy_mode mode);
 222
 223         /* These two are jmp to, not actually called. */
 224         void (*irq_enable_sysexit)(void);
 225         void (*iret)(void);
 226 };
 227
 228 extern struct paravirt_ops paravirt_ops;
 229
 230 #define PARAVIRT_PATCH(x)                                       \
 231         (offsetof(struct paravirt_ops, x) / sizeof(void *))
 232
 233 #define paravirt_type(type)                                     \
 234         [paravirt_typenum] "i" (PARAVIRT_PATCH(type))
 235 #define paravirt_clobber(clobber)               \
 236         [paravirt_clobber] "i" (clobber)
 237
 238 /*
 239  * Generate some code, and mark it as patchable by the
 240  * apply_paravirt() alternate instruction patcher.
 241  */
 242 #define _paravirt_alt(insn_string, type, clobber)       \
 243         "771:\n\t" insn_string "\n" "772:\n"            \
 244         ".pushsection .parainstructions,\"a\"\n"        \
 245         "  .long 771b\n"                                \
 246         "  .byte " type "\n"                            \
 247         "  .byte 772b-771b\n"                           \
 248         "  .short " clobber "\n"                        \
 249         ".popsection\n"
 250
 251 /* Generate patchable code, with the default asm parameters. */
 252 #define paravirt_alt(insn_string)                                       \
 253         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
 254
 255 unsigned paravirt_patch_nop(void);
 256 unsigned paravirt_patch_ignore(unsigned len);
 257 unsigned paravirt_patch_call(void *insnbuf,
 258                              const void *target, u16 tgt_clobbers,
 259                              unsigned long addr, u16 site_clobbers,
 260                              unsigned len);
 261 unsigned paravirt_patch_jmp(const void *target, void *insnbuf,
 262                             unsigned long addr, unsigned len);
 263 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
 264                                 unsigned long addr, unsigned len);
 265
 266 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
 267                               const char *start, const char *end);
 268
 269 int paravirt_disable_iospace(void);
 270
 271 /*
 272  * This generates an indirect call based on the operation type number.
 273  * The type number, computed in PARAVIRT_PATCH, is derived from the
 274  * offset into the paravirt_ops structure, and can therefore be freely
 275  * converted back into a structure offset.
 276  */
 277 #define PARAVIRT_CALL   "call *(paravirt_ops+%c[paravirt_typenum]*4);"
 278
 279 /*
 280  * These macros are intended to wrap calls into a paravirt_ops
 281  * operation, so that they can be later identified and patched at
 282  * runtime.
 283  *
 284  * Normally, a call to a pv_op function is a simple indirect call:
 285  * (paravirt_ops.operations)(args...).
 286  *
 287  * Unfortunately, this is a relatively slow operation for modern CPUs,
 288  * because it cannot necessarily determine what the destination
 289  * address is.  In this case, the address is a runtime constant, so at
 290  * the very least we can patch the call to e a simple direct call, or
 291  * ideally, patch an inline implementation into the callsite.  (Direct
 292  * calls are essentially free, because the call and return addresses
 293  * are completely predictable.)
 294  *
 295  * These macros rely on the standard gcc "regparm(3)" calling
 296  * convention, in which the first three arguments are placed in %eax,
 297  * %edx, %ecx (in that order), and the remaining arguments are placed
 298  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
 299  * to be modified (either clobbered or used for return values).
 300  *
 301  * The call instruction itself is marked by placing its start address
 302  * and size into the .parainstructions section, so that
 303  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
 304  * appropriate patching under the control of the backend paravirt_ops
 305  * implementation.
 306  *
 307  * Unfortunately there's no way to get gcc to generate the args setup
 308  * for the call, and then allow the call itself to be generated by an
 309  * inline asm.  Because of this, we must do the complete arg setup and
 310  * return value handling from within these macros.  This is fairly
 311  * cumbersome.
 312  *
 313  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
 314  * It could be extended to more arguments, but there would be little
 315  * to be gained from that.  For each number of arguments, there are
 316  * the two VCALL and CALL variants for void and non-void functions.
 317  *
 318  * When there is a return value, the invoker of the macro must specify
 319  * the return type.  The macro then uses sizeof() on that type to
 320  * determine whether its a 32 or 64 bit value, and places the return
 321  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
 322  * 64-bit).
 323  *
 324  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
 325  * in low,high order.
 326  *
 327  * Small structures are passed and returned in registers.  The macro
 328  * calling convention can't directly deal with this, so the wrapper
 329  * functions must do this.
 330  *
 331  * These PVOP_* macros are only defined within this header.  This
 332  * means that all uses must be wrapped in inline functions.  This also
 333  * makes sure the incoming and outgoing types are always correct.
 334  */
 335 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
 336         ({                                                              \
 337                 rettype __ret;                                          \
 338                 unsigned long __eax, __edx, __ecx;                      \
 339                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
 340                         asm volatile(pre                                \
 341                                      paravirt_alt(PARAVIRT_CALL)        \
 342                                      post                               \
 343                                      : "=a" (__eax), "=d" (__edx),      \
 344                                        "=c" (__ecx)                     \
 345                                      : paravirt_type(op),               \
 346                                        paravirt_clobber(CLBR_ANY),      \
 347                                        ##__VA_ARGS__                    \
 348                                      : "memory", "cc");                 \
 349                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
 350                 } else {                                                \
 351                         asm volatile(pre                                \
 352                                      paravirt_alt(PARAVIRT_CALL)        \
 353                                      post                               \
 354                                      : "=a" (__eax), "=d" (__edx),      \
 355                                        "=c" (__ecx)                     \
 356                                      : paravirt_type(op),               \
 357                                        paravirt_clobber(CLBR_ANY),      \
 358                                        ##__VA_ARGS__                    \
 359                                      : "memory", "cc");                 \
 360                         __ret = (rettype)__eax;                         \
 361                 }                                                       \
 362                 __ret;                                                  \
 363         })
 364 #define __PVOP_VCALL(op, pre, post, ...)                                \
 365         ({                                                              \
 366                 unsigned long __eax, __edx, __ecx;                      \
 367                 asm volatile(pre                                        \
 368                              paravirt_alt(PARAVIRT_CALL)                \
 369                              post                                       \
 370                              : "=a" (__eax), "=d" (__edx), "=c" (__ecx) \
 371                              : paravirt_type(op),                       \
 372                                paravirt_clobber(CLBR_ANY),              \
 373                                ##__VA_ARGS__                            \
 374                              : "memory", "cc");                         \
 375         })
 376
 377 #define PVOP_CALL0(rettype, op)                                         \
 378         __PVOP_CALL(rettype, op, "", "")
 379 #define PVOP_VCALL0(op)                                                 \
 380         __PVOP_VCALL(op, "", "")
 381
 382 #define PVOP_CALL1(rettype, op, arg1)                                   \
 383         __PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)))
 384 #define PVOP_VCALL1(op, arg1)                                           \
 385         __PVOP_VCALL(op, "", "", "0" ((u32)(arg1)))
 386
 387 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
 388         __PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)), "1" ((u32)(arg2)))
 389 #define PVOP_VCALL2(op, arg1, arg2)                                     \
 390         __PVOP_VCALL(op, "", "", "0" ((u32)(arg1)), "1" ((u32)(arg2)))
 391
 392 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
 393         __PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)),             \
 394                     "1"((u32)(arg2)), "2"((u32)(arg3)))
 395 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
 396         __PVOP_VCALL(op, "", "", "0" ((u32)(arg1)), "1"((u32)(arg2)),   \
 397                      "2"((u32)(arg3)))
 398
 399 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 400         __PVOP_CALL(rettype, op,                                        \
 401                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 402                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
 403                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
 404 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 405         __PVOP_VCALL(op,                                                \
 406                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 407                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
 408                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
 409
 410 static inline int paravirt_enabled(void)
 411 {
 412         return paravirt_ops.paravirt_enabled;
 413 }
 414
 415 static inline void load_esp0(struct tss_struct *tss,
 416                              struct thread_struct *thread)
 417 {
 418         PVOP_VCALL2(load_esp0, tss, thread);
 419 }
 420
 421 #define ARCH_SETUP                      paravirt_ops.arch_setup();
 422 static inline unsigned long get_wallclock(void)
 423 {
 424         return PVOP_CALL0(unsigned long, get_wallclock);
 425 }
 426
 427 static inline int set_wallclock(unsigned long nowtime)
 428 {
 429         return PVOP_CALL1(int, set_wallclock, nowtime);
 430 }
 431
 432 static inline void (*choose_time_init(void))(void)
 433 {
 434         return paravirt_ops.time_init;
 435 }
 436
 437 /* The paravirtualized CPUID instruction. */
 438 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
 439                            unsigned int *ecx, unsigned int *edx)
 440 {
 441         PVOP_VCALL4(cpuid, eax, ebx, ecx, edx);
 442 }
 443
 444 /*
 445  * These special macros can be used to get or set a debugging register
 446  */
 447 static inline unsigned long paravirt_get_debugreg(int reg)
 448 {
 449         return PVOP_CALL1(unsigned long, get_debugreg, reg);
 450 }
 451 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
 452 static inline void set_debugreg(unsigned long val, int reg)
 453 {
 454         PVOP_VCALL2(set_debugreg, reg, val);
 455 }
 456
 457 static inline void clts(void)
 458 {
 459         PVOP_VCALL0(clts);
 460 }
 461
 462 static inline unsigned long read_cr0(void)
 463 {
 464         return PVOP_CALL0(unsigned long, read_cr0);
 465 }
 466
 467 static inline void write_cr0(unsigned long x)
 468 {
 469         PVOP_VCALL1(write_cr0, x);
 470 }
 471
 472 static inline unsigned long read_cr2(void)
 473 {
 474         return PVOP_CALL0(unsigned long, read_cr2);
 475 }
 476
 477 static inline void write_cr2(unsigned long x)
 478 {
 479         PVOP_VCALL1(write_cr2, x);
 480 }
 481
 482 static inline unsigned long read_cr3(void)
 483 {
 484         return PVOP_CALL0(unsigned long, read_cr3);
 485 }
 486
 487 static inline void write_cr3(unsigned long x)
 488 {
 489         PVOP_VCALL1(write_cr3, x);
 490 }
 491
 492 static inline unsigned long read_cr4(void)
 493 {
 494         return PVOP_CALL0(unsigned long, read_cr4);
 495 }
 496 static inline unsigned long read_cr4_safe(void)
 497 {
 498         return PVOP_CALL0(unsigned long, read_cr4_safe);
 499 }
 500
 501 static inline void write_cr4(unsigned long x)
 502 {
 503         PVOP_VCALL1(write_cr4, x);
 504 }
 505
 506 static inline void raw_safe_halt(void)
 507 {
 508         PVOP_VCALL0(safe_halt);
 509 }
 510
 511 static inline void halt(void)
 512 {
 513         PVOP_VCALL0(safe_halt);
 514 }
 515
 516 static inline void wbinvd(void)
 517 {
 518         PVOP_VCALL0(wbinvd);
 519 }
 520
 521 #define get_kernel_rpl()  (paravirt_ops.kernel_rpl)
 522
 523 static inline u64 paravirt_read_msr(unsigned msr, int *err)
 524 {
 525         return PVOP_CALL2(u64, read_msr, msr, err);
 526 }
 527 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
 528 {
 529         return PVOP_CALL3(int, write_msr, msr, low, high);
 530 }
 531
 532 /* These should all do BUG_ON(_err), but our headers are too tangled. */
 533 #define rdmsr(msr,val1,val2) do {               \
 534         int _err;                               \
 535         u64 _l = paravirt_read_msr(msr, &_err); \
 536         val1 = (u32)_l;                         \
 537         val2 = _l >> 32;                        \
 538 } while(0)
 539
 540 #define wrmsr(msr,val1,val2) do {               \
 541         paravirt_write_msr(msr, val1, val2);    \
 542 } while(0)
 543
 544 #define rdmsrl(msr,val) do {                    \
 545         int _err;                               \
 546         val = paravirt_read_msr(msr, &_err);    \
 547 } while(0)
 548
 549 #define wrmsrl(msr,val)         wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
 550 #define wrmsr_safe(msr,a,b)     paravirt_write_msr(msr, a, b)
 551
 552 /* rdmsr with exception handling */
 553 #define rdmsr_safe(msr,a,b) ({                  \
 554         int _err;                               \
 555         u64 _l = paravirt_read_msr(msr, &_err); \
 556         (*a) = (u32)_l;                         \
 557         (*b) = _l >> 32;                        \
 558         _err; })
 559
 560
 561 static inline u64 paravirt_read_tsc(void)
 562 {
 563         return PVOP_CALL0(u64, read_tsc);
 564 }
 565
 566 #define rdtscl(low) do {                        \
 567         u64 _l = paravirt_read_tsc();           \
 568         low = (int)_l;                          \
 569 } while(0)
 570
 571 #define rdtscll(val) (val = paravirt_read_tsc())
 572
 573 static inline unsigned long long paravirt_sched_clock(void)
 574 {
 575         return PVOP_CALL0(unsigned long long, sched_clock);
 576 }
 577 #define calculate_cpu_khz() (paravirt_ops.get_cpu_khz())
 578
 579 #define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
 580
 581 static inline unsigned long long paravirt_read_pmc(int counter)
 582 {
 583         return PVOP_CALL1(u64, read_pmc, counter);
 584 }
 585
 586 #define rdpmc(counter,low,high) do {            \
 587         u64 _l = paravirt_read_pmc(counter);    \
 588         low = (u32)_l;                          \
 589         high = _l >> 32;                        \
 590 } while(0)
 591
 592 static inline void load_TR_desc(void)
 593 {
 594         PVOP_VCALL0(load_tr_desc);
 595 }
 596 static inline void load_gdt(const struct Xgt_desc_struct *dtr)
 597 {
 598         PVOP_VCALL1(load_gdt, dtr);
 599 }
 600 static inline void load_idt(const struct Xgt_desc_struct *dtr)
 601 {
 602         PVOP_VCALL1(load_idt, dtr);
 603 }
 604 static inline void set_ldt(const void *addr, unsigned entries)
 605 {
 606         PVOP_VCALL2(set_ldt, addr, entries);
 607 }
 608 static inline void store_gdt(struct Xgt_desc_struct *dtr)
 609 {
 610         PVOP_VCALL1(store_gdt, dtr);
 611 }
 612 static inline void store_idt(struct Xgt_desc_struct *dtr)
 613 {
 614         PVOP_VCALL1(store_idt, dtr);
 615 }
 616 static inline unsigned long paravirt_store_tr(void)
 617 {
 618         return PVOP_CALL0(unsigned long, store_tr);
 619 }
 620 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 621 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 622 {
 623         PVOP_VCALL2(load_tls, t, cpu);
 624 }
 625 static inline void write_ldt_entry(void *dt, int entry, u32 low, u32 high)
 626 {
 627         PVOP_VCALL4(write_ldt_entry, dt, entry, low, high);
 628 }
 629 static inline void write_gdt_entry(void *dt, int entry, u32 low, u32 high)
 630 {
 631         PVOP_VCALL4(write_gdt_entry, dt, entry, low, high);
 632 }
 633 static inline void write_idt_entry(void *dt, int entry, u32 low, u32 high)
 634 {
 635         PVOP_VCALL4(write_idt_entry, dt, entry, low, high);
 636 }
 637 static inline void set_iopl_mask(unsigned mask)
 638 {
 639         PVOP_VCALL1(set_iopl_mask, mask);
 640 }
 641
 642 /* The paravirtualized I/O functions */
 643 static inline void slow_down_io(void) {
 644         paravirt_ops.io_delay();
 645 #ifdef REALLY_SLOW_IO
 646         paravirt_ops.io_delay();
 647         paravirt_ops.io_delay();
 648         paravirt_ops.io_delay();
 649 #endif
 650 }
 651
 652 #ifdef CONFIG_X86_LOCAL_APIC
 653 /*
 654  * Basic functions accessing APICs.
 655  */
 656 static inline void apic_write(unsigned long reg, unsigned long v)
 657 {
 658         PVOP_VCALL2(apic_write, reg, v);
 659 }
 660
 661 static inline void apic_write_atomic(unsigned long reg, unsigned long v)
 662 {
 663         PVOP_VCALL2(apic_write_atomic, reg, v);
 664 }
 665
 666 static inline unsigned long apic_read(unsigned long reg)
 667 {
 668         return PVOP_CALL1(unsigned long, apic_read, reg);
 669 }
 670
 671 static inline void setup_boot_clock(void)
 672 {
 673         PVOP_VCALL0(setup_boot_clock);
 674 }
 675
 676 static inline void setup_secondary_clock(void)
 677 {
 678         PVOP_VCALL0(setup_secondary_clock);
 679 }
 680 #endif
 681
 682 static inline void paravirt_post_allocator_init(void)
 683 {
 684         if (paravirt_ops.post_allocator_init)
 685                 (*paravirt_ops.post_allocator_init)();
 686 }
 687
 688 static inline void paravirt_pagetable_setup_start(pgd_t *base)
 689 {
 690         if (paravirt_ops.pagetable_setup_start)
 691                 (*paravirt_ops.pagetable_setup_start)(base);
 692 }
 693
 694 static inline void paravirt_pagetable_setup_done(pgd_t *base)
 695 {
 696         if (paravirt_ops.pagetable_setup_done)
 697                 (*paravirt_ops.pagetable_setup_done)(base);
 698 }
 699
 700 #ifdef CONFIG_SMP
 701 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
 702                                     unsigned long start_esp)
 703 {
 704         PVOP_VCALL3(startup_ipi_hook, phys_apicid, start_eip, start_esp);
 705 }
 706 #endif
 707
 708 static inline void paravirt_activate_mm(struct mm_struct *prev,
 709                                         struct mm_struct *next)
 710 {
 711         PVOP_VCALL2(activate_mm, prev, next);
 712 }
 713
 714 static inline void arch_dup_mmap(struct mm_struct *oldmm,
 715                                  struct mm_struct *mm)
 716 {
 717         PVOP_VCALL2(dup_mmap, oldmm, mm);
 718 }
 719
 720 static inline void arch_exit_mmap(struct mm_struct *mm)
 721 {
 722         PVOP_VCALL1(exit_mmap, mm);
 723 }
 724
 725 static inline void __flush_tlb(void)
 726 {
 727         PVOP_VCALL0(flush_tlb_user);
 728 }
 729 static inline void __flush_tlb_global(void)
 730 {
 731         PVOP_VCALL0(flush_tlb_kernel);
 732 }
 733 static inline void __flush_tlb_single(unsigned long addr)
 734 {
 735         PVOP_VCALL1(flush_tlb_single, addr);
 736 }
 737
 738 static inline void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
 739                                     unsigned long va)
 740 {
 741         PVOP_VCALL3(flush_tlb_others, &cpumask, mm, va);
 742 }
 743
 744 static inline void paravirt_alloc_pt(struct mm_struct *mm, unsigned pfn)
 745 {
 746         PVOP_VCALL2(alloc_pt, mm, pfn);
 747 }
 748 static inline void paravirt_release_pt(unsigned pfn)
 749 {
 750         PVOP_VCALL1(release_pt, pfn);
 751 }
 752
 753 static inline void paravirt_alloc_pd(unsigned pfn)
 754 {
 755         PVOP_VCALL1(alloc_pd, pfn);
 756 }
 757
 758 static inline void paravirt_alloc_pd_clone(unsigned pfn, unsigned clonepfn,
 759                                            unsigned start, unsigned count)
 760 {
 761         PVOP_VCALL4(alloc_pd_clone, pfn, clonepfn, start, count);
 762 }
 763 static inline void paravirt_release_pd(unsigned pfn)
 764 {
 765         PVOP_VCALL1(release_pd, pfn);
 766 }
 767
 768 #ifdef CONFIG_HIGHPTE
 769 static inline void *kmap_atomic_pte(struct page *page, enum km_type type)
 770 {
 771         unsigned long ret;
 772         ret = PVOP_CALL2(unsigned long, kmap_atomic_pte, page, type);
 773         return (void *)ret;
 774 }
 775 #endif
 776
 777 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
 778                               pte_t *ptep)
 779 {
 780         PVOP_VCALL3(pte_update, mm, addr, ptep);
 781 }
 782
 783 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
 784                                     pte_t *ptep)
 785 {
 786         PVOP_VCALL3(pte_update_defer, mm, addr, ptep);
 787 }
 788
 789 #ifdef CONFIG_X86_PAE
 790 static inline pte_t __pte(unsigned long long val)
 791 {
 792         unsigned long long ret = PVOP_CALL2(unsigned long long, make_pte,
 793                                             val, val >> 32);
 794         return (pte_t) { ret, ret >> 32 };
 795 }
 796
 797 static inline pmd_t __pmd(unsigned long long val)
 798 {
 799         return (pmd_t) { PVOP_CALL2(unsigned long long, make_pmd, val, val >> 32) };
 800 }
 801
 802 static inline pgd_t __pgd(unsigned long long val)
 803 {
 804         return (pgd_t) { PVOP_CALL2(unsigned long long, make_pgd, val, val >> 32) };
 805 }
 806
 807 static inline unsigned long long pte_val(pte_t x)
 808 {
 809         return PVOP_CALL2(unsigned long long, pte_val, x.pte_low, x.pte_high);
 810 }
 811
 812 static inline unsigned long long pmd_val(pmd_t x)
 813 {
 814         return PVOP_CALL2(unsigned long long, pmd_val, x.pmd, x.pmd >> 32);
 815 }
 816
 817 static inline unsigned long long pgd_val(pgd_t x)
 818 {
 819         return PVOP_CALL2(unsigned long long, pgd_val, x.pgd, x.pgd >> 32);
 820 }
 821
 822 static inline void set_pte(pte_t *ptep, pte_t pteval)
 823 {
 824         PVOP_VCALL3(set_pte, ptep, pteval.pte_low, pteval.pte_high);
 825 }
 826
 827 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 828                               pte_t *ptep, pte_t pteval)
 829 {
 830         /* 5 arg words */
 831         paravirt_ops.set_pte_at(mm, addr, ptep, pteval);
 832 }
 833
 834 static inline void set_pte_atomic(pte_t *ptep, pte_t pteval)
 835 {
 836         PVOP_VCALL3(set_pte_atomic, ptep, pteval.pte_low, pteval.pte_high);
 837 }
 838
 839 static inline void set_pte_present(struct mm_struct *mm, unsigned long addr,
 840                                    pte_t *ptep, pte_t pte)
 841 {
 842         /* 5 arg words */
 843         paravirt_ops.set_pte_present(mm, addr, ptep, pte);
 844 }
 845
 846 static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
 847 {
 848         PVOP_VCALL3(set_pmd, pmdp, pmdval.pmd, pmdval.pmd >> 32);
 849 }
 850
 851 static inline void set_pud(pud_t *pudp, pud_t pudval)
 852 {
 853         PVOP_VCALL3(set_pud, pudp, pudval.pgd.pgd, pudval.pgd.pgd >> 32);
 854 }
 855
 856 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 857 {
 858         PVOP_VCALL3(pte_clear, mm, addr, ptep);
 859 }
 860
 861 static inline void pmd_clear(pmd_t *pmdp)
 862 {
 863         PVOP_VCALL1(pmd_clear, pmdp);
 864 }
 865
 866 #else  /* !CONFIG_X86_PAE */
 867
 868 static inline pte_t __pte(unsigned long val)
 869 {
 870         return (pte_t) { PVOP_CALL1(unsigned long, make_pte, val) };
 871 }
 872
 873 static inline pgd_t __pgd(unsigned long val)
 874 {
 875         return (pgd_t) { PVOP_CALL1(unsigned long, make_pgd, val) };
 876 }
 877
 878 static inline unsigned long pte_val(pte_t x)
 879 {
 880         return PVOP_CALL1(unsigned long, pte_val, x.pte_low);
 881 }
 882
 883 static inline unsigned long pgd_val(pgd_t x)
 884 {
 885         return PVOP_CALL1(unsigned long, pgd_val, x.pgd);
 886 }
 887
 888 static inline void set_pte(pte_t *ptep, pte_t pteval)
 889 {
 890         PVOP_VCALL2(set_pte, ptep, pteval.pte_low);
 891 }
 892
 893 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 894                               pte_t *ptep, pte_t pteval)
 895 {
 896         PVOP_VCALL4(set_pte_at, mm, addr, ptep, pteval.pte_low);
 897 }
 898
 899 static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
 900 {
 901         PVOP_VCALL2(set_pmd, pmdp, pmdval.pud.pgd.pgd);
 902 }
 903 #endif  /* CONFIG_X86_PAE */
 904
 905 #define  __HAVE_ARCH_ENTER_LAZY_CPU_MODE
 906 static inline void arch_enter_lazy_cpu_mode(void)
 907 {
 908         PVOP_VCALL1(set_lazy_mode, PARAVIRT_LAZY_CPU);
 909 }
 910
 911 static inline void arch_leave_lazy_cpu_mode(void)
 912 {
 913         PVOP_VCALL1(set_lazy_mode, PARAVIRT_LAZY_NONE);
 914 }
 915
 916 static inline void arch_flush_lazy_cpu_mode(void)
 917 {
 918         PVOP_VCALL1(set_lazy_mode, PARAVIRT_LAZY_FLUSH);
 919 }
 920
 921
 922 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 923 static inline void arch_enter_lazy_mmu_mode(void)
 924 {
 925         PVOP_VCALL1(set_lazy_mode, PARAVIRT_LAZY_MMU);
 926 }
 927
 928 static inline void arch_leave_lazy_mmu_mode(void)
 929 {
 930         PVOP_VCALL1(set_lazy_mode, PARAVIRT_LAZY_NONE);
 931 }
 932
 933 static inline void arch_flush_lazy_mmu_mode(void)
 934 {
 935         PVOP_VCALL1(set_lazy_mode, PARAVIRT_LAZY_FLUSH);
 936 }
 937
 938 void _paravirt_nop(void);
 939 #define paravirt_nop    ((void *)_paravirt_nop)
 940
 941 /* These all sit in the .parainstructions section to tell us what to patch. */
 942 struct paravirt_patch_site {
 943         u8 *instr;              /* original instructions */
 944         u8 instrtype;           /* type of this instruction */
 945         u8 len;                 /* length of original instruction */
 946         u16 clobbers;           /* what registers you may clobber */
 947 };
 948
 949 extern struct paravirt_patch_site __parainstructions[],
 950         __parainstructions_end[];
 951
 952 static inline unsigned long __raw_local_save_flags(void)
 953 {
 954         unsigned long f;
 955
 956         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
 957                                   PARAVIRT_CALL
 958                                   "popl %%edx; popl %%ecx")
 959                      : "=a"(f)
 960                      : paravirt_type(save_fl),
 961                        paravirt_clobber(CLBR_EAX)
 962                      : "memory", "cc");
 963         return f;
 964 }
 965
 966 static inline void raw_local_irq_restore(unsigned long f)
 967 {
 968         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
 969                                   PARAVIRT_CALL
 970                                   "popl %%edx; popl %%ecx")
 971                      : "=a"(f)
 972                      : "0"(f),
 973                        paravirt_type(restore_fl),
 974                        paravirt_clobber(CLBR_EAX)
 975                      : "memory", "cc");
 976 }
 977
 978 static inline void raw_local_irq_disable(void)
 979 {
 980         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
 981                                   PARAVIRT_CALL
 982                                   "popl %%edx; popl %%ecx")
 983                      :
 984                      : paravirt_type(irq_disable),
 985                        paravirt_clobber(CLBR_EAX)
 986                      : "memory", "eax", "cc");
 987 }
 988
 989 static inline void raw_local_irq_enable(void)
 990 {
 991         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
 992                                   PARAVIRT_CALL
 993                                   "popl %%edx; popl %%ecx")
 994                      :
 995                      : paravirt_type(irq_enable),
 996                        paravirt_clobber(CLBR_EAX)
 997                      : "memory", "eax", "cc");
 998 }
 999
1000 static inline unsigned long __raw_local_irq_save(void)
1001 {
1002         unsigned long f;
1003
1004         f = __raw_local_save_flags();
1005         raw_local_irq_disable();
1006         return f;
1007 }
1008
1009 #define CLI_STRING                                                      \
1010         _paravirt_alt("pushl %%ecx; pushl %%edx;"                       \
1011                       "call *paravirt_ops+%c[paravirt_cli_type]*4;"     \
1012                       "popl %%edx; popl %%ecx",                         \
1013                       "%c[paravirt_cli_type]", "%c[paravirt_clobber]")
1014
1015 #define STI_STRING                                                      \
1016         _paravirt_alt("pushl %%ecx; pushl %%edx;"                       \
1017                       "call *paravirt_ops+%c[paravirt_sti_type]*4;"     \
1018                       "popl %%edx; popl %%ecx",                         \
1019                       "%c[paravirt_sti_type]", "%c[paravirt_clobber]")
1020
1021 #define CLI_STI_CLOBBERS , "%eax"
1022 #define CLI_STI_INPUT_ARGS                                              \
1023         ,                                                               \
1024         [paravirt_cli_type] "i" (PARAVIRT_PATCH(irq_disable)),          \
1025         [paravirt_sti_type] "i" (PARAVIRT_PATCH(irq_enable)),           \
1026         paravirt_clobber(CLBR_EAX)
1027
1028 /* Make sure as little as possible of this mess escapes. */
1029 #undef PARAVIRT_CALL
1030 #undef __PVOP_CALL
1031 #undef __PVOP_VCALL
1032 #undef PVOP_VCALL0
1033 #undef PVOP_CALL0
1034 #undef PVOP_VCALL1
1035 #undef PVOP_CALL1
1036 #undef PVOP_VCALL2
1037 #undef PVOP_CALL2
1038 #undef PVOP_VCALL3
1039 #undef PVOP_CALL3
1040 #undef PVOP_VCALL4
1041 #undef PVOP_CALL4
1042
1043 #else  /* __ASSEMBLY__ */
1044
1045 #define PARA_PATCH(off) ((off) / 4)
1046
1047 #define PARA_SITE(ptype, clobbers, ops)         \
1048 771:;                                           \
1049         ops;                                    \
1050 772:;                                           \
1051         .pushsection .parainstructions,"a";     \
1052          .long 771b;                            \
1053          .byte ptype;                           \
1054          .byte 772b-771b;                       \
1055          .short clobbers;                       \
1056         .popsection
1057
1058 #define INTERRUPT_RETURN                                        \
1059         PARA_SITE(PARA_PATCH(PARAVIRT_iret), CLBR_NONE,         \
1060                   jmp *%cs:paravirt_ops+PARAVIRT_iret)
1061
1062 #define DISABLE_INTERRUPTS(clobbers)                                    \
1063         PARA_SITE(PARA_PATCH(PARAVIRT_irq_disable), clobbers,           \
1064                   pushl %eax; pushl %ecx; pushl %edx;                   \
1065                   call *%cs:paravirt_ops+PARAVIRT_irq_disable;          \
1066                   popl %edx; popl %ecx; popl %eax)                      \
1067
1068 #define ENABLE_INTERRUPTS(clobbers)                                     \
1069         PARA_SITE(PARA_PATCH(PARAVIRT_irq_enable), clobbers,            \
1070                   pushl %eax; pushl %ecx; pushl %edx;                   \
1071                   call *%cs:paravirt_ops+PARAVIRT_irq_enable;           \
1072                   popl %edx; popl %ecx; popl %eax)
1073
1074 #define ENABLE_INTERRUPTS_SYSEXIT                                       \
1075         PARA_SITE(PARA_PATCH(PARAVIRT_irq_enable_sysexit), CLBR_NONE,   \
1076                   jmp *%cs:paravirt_ops+PARAVIRT_irq_enable_sysexit)
1077
1078 #define GET_CR0_INTO_EAX                        \
1079         push %ecx; push %edx;                   \
1080         call *paravirt_ops+PARAVIRT_read_cr0;   \
1081         pop %edx; pop %ecx
1082
1083 #endif /* __ASSEMBLY__ */
1084 #endif /* CONFIG_PARAVIRT */
1085 #endif  /* __ASM_PARAVIRT_H */