Pileus Git - ~andy/linux/blob - 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
  37 /* general info */
  38 struct pv_info {
  39         unsigned int kernel_rpl;
  40         int shared_kernel_pmd;
  41         int paravirt_enabled;
  42         const char *name;
  43 };
  44
  45 struct pv_init_ops {
  46         /*
  47          * Patch may replace one of the defined code sequences with
  48          * arbitrary code, subject to the same register constraints.
  49          * This generally means the code is not free to clobber any
  50          * registers other than EAX.  The patch function should return
  51          * the number of bytes of code generated, as we nop pad the
  52          * rest in generic code.
  53          */
  54         unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
  55                           unsigned long addr, unsigned len);
  56
  57         /* Basic arch-specific setup */
  58         void (*arch_setup)(void);
  59         char *(*memory_setup)(void);
  60         void (*post_allocator_init)(void);
  61
  62         /* Print a banner to identify the environment */
  63         void (*banner)(void);
  64 };
  65
  66
  67 struct pv_misc_ops {
  68         /* Set deferred update mode, used for batching operations. */
  69         void (*set_lazy_mode)(enum paravirt_lazy_mode mode);
  70 };
  71
  72 struct pv_time_ops {
  73         void (*time_init)(void);
  74
  75         /* Set and set time of day */
  76         unsigned long (*get_wallclock)(void);
  77         int (*set_wallclock)(unsigned long);
  78
  79         unsigned long long (*sched_clock)(void);
  80         unsigned long (*get_cpu_khz)(void);
  81 };
  82
  83 struct pv_cpu_ops {
  84         /* hooks for various privileged instructions */
  85         unsigned long (*get_debugreg)(int regno);
  86         void (*set_debugreg)(int regno, unsigned long value);
  87
  88         void (*clts)(void);
  89
  90         unsigned long (*read_cr0)(void);
  91         void (*write_cr0)(unsigned long);
  92
  93         unsigned long (*read_cr4_safe)(void);
  94         unsigned long (*read_cr4)(void);
  95         void (*write_cr4)(unsigned long);
  96
  97         /* Segment descriptor handling */
  98         void (*load_tr_desc)(void);
  99         void (*load_gdt)(const struct Xgt_desc_struct *);
 100         void (*load_idt)(const struct Xgt_desc_struct *);
 101         void (*store_gdt)(struct Xgt_desc_struct *);
 102         void (*store_idt)(struct Xgt_desc_struct *);
 103         void (*set_ldt)(const void *desc, unsigned entries);
 104         unsigned long (*store_tr)(void);
 105         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
 106         void (*write_ldt_entry)(struct desc_struct *,
 107                                 int entrynum, u32 low, u32 high);
 108         void (*write_gdt_entry)(struct desc_struct *,
 109                                 int entrynum, u32 low, u32 high);
 110         void (*write_idt_entry)(struct desc_struct *,
 111                                 int entrynum, u32 low, u32 high);
 112         void (*load_esp0)(struct tss_struct *tss, struct thread_struct *t);
 113
 114         void (*set_iopl_mask)(unsigned mask);
 115
 116         void (*wbinvd)(void);
 117         void (*io_delay)(void);
 118
 119         /* cpuid emulation, mostly so that caps bits can be disabled */
 120         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
 121                       unsigned int *ecx, unsigned int *edx);
 122
 123         /* MSR, PMC and TSR operations.
 124            err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
 125         u64 (*read_msr)(unsigned int msr, int *err);
 126         int (*write_msr)(unsigned int msr, u64 val);
 127
 128         u64 (*read_tsc)(void);
 129         u64 (*read_pmc)(void);
 130
 131         /* These two are jmp to, not actually called. */
 132         void (*irq_enable_sysexit)(void);
 133         void (*iret)(void);
 134 };
 135
 136 struct pv_irq_ops {
 137         void (*init_IRQ)(void);
 138
 139         /*
 140          * Get/set interrupt state.  save_fl and restore_fl are only
 141          * expected to use X86_EFLAGS_IF; all other bits
 142          * returned from save_fl are undefined, and may be ignored by
 143          * restore_fl.
 144          */
 145         unsigned long (*save_fl)(void);
 146         void (*restore_fl)(unsigned long);
 147         void (*irq_disable)(void);
 148         void (*irq_enable)(void);
 149         void (*safe_halt)(void);
 150         void (*halt)(void);
 151 };
 152
 153 struct pv_apic_ops {
 154 #ifdef CONFIG_X86_LOCAL_APIC
 155         /*
 156          * Direct APIC operations, principally for VMI.  Ideally
 157          * these shouldn't be in this interface.
 158          */
 159         void (*apic_write)(unsigned long reg, unsigned long v);
 160         void (*apic_write_atomic)(unsigned long reg, unsigned long v);
 161         unsigned long (*apic_read)(unsigned long reg);
 162         void (*setup_boot_clock)(void);
 163         void (*setup_secondary_clock)(void);
 164
 165         void (*startup_ipi_hook)(int phys_apicid,
 166                                  unsigned long start_eip,
 167                                  unsigned long start_esp);
 168 #endif
 169 };
 170
 171 struct pv_mmu_ops {
 172         /*
 173          * Called before/after init_mm pagetable setup. setup_start
 174          * may reset %cr3, and may pre-install parts of the pagetable;
 175          * pagetable setup is expected to preserve any existing
 176          * mapping.
 177          */
 178         void (*pagetable_setup_start)(pgd_t *pgd_base);
 179         void (*pagetable_setup_done)(pgd_t *pgd_base);
 180
 181         unsigned long (*read_cr2)(void);
 182         void (*write_cr2)(unsigned long);
 183
 184         unsigned long (*read_cr3)(void);
 185         void (*write_cr3)(unsigned long);
 186
 187         /*
 188          * Hooks for intercepting the creation/use/destruction of an
 189          * mm_struct.
 190          */
 191         void (*activate_mm)(struct mm_struct *prev,
 192                             struct mm_struct *next);
 193         void (*dup_mmap)(struct mm_struct *oldmm,
 194                          struct mm_struct *mm);
 195         void (*exit_mmap)(struct mm_struct *mm);
 196
 197
 198         /* TLB operations */
 199         void (*flush_tlb_user)(void);
 200         void (*flush_tlb_kernel)(void);
 201         void (*flush_tlb_single)(unsigned long addr);
 202         void (*flush_tlb_others)(const cpumask_t *cpus, struct mm_struct *mm,
 203                                  unsigned long va);
 204
 205         /* Hooks for allocating/releasing pagetable pages */
 206         void (*alloc_pt)(struct mm_struct *mm, u32 pfn);
 207         void (*alloc_pd)(u32 pfn);
 208         void (*alloc_pd_clone)(u32 pfn, u32 clonepfn, u32 start, u32 count);
 209         void (*release_pt)(u32 pfn);
 210         void (*release_pd)(u32 pfn);
 211
 212         /* Pagetable manipulation functions */
 213         void (*set_pte)(pte_t *ptep, pte_t pteval);
 214         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
 215                            pte_t *ptep, pte_t pteval);
 216         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
 217         void (*pte_update)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
 218         void (*pte_update_defer)(struct mm_struct *mm,
 219                                  unsigned long addr, pte_t *ptep);
 220
 221 #ifdef CONFIG_X86_PAE
 222         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
 223         void (*set_pte_present)(struct mm_struct *mm, unsigned long addr,
 224                                 pte_t *ptep, pte_t pte);
 225         void (*set_pud)(pud_t *pudp, pud_t pudval);
 226         void (*pte_clear)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
 227         void (*pmd_clear)(pmd_t *pmdp);
 228
 229         unsigned long long (*pte_val)(pte_t);
 230         unsigned long long (*pmd_val)(pmd_t);
 231         unsigned long long (*pgd_val)(pgd_t);
 232
 233         pte_t (*make_pte)(unsigned long long pte);
 234         pmd_t (*make_pmd)(unsigned long long pmd);
 235         pgd_t (*make_pgd)(unsigned long long pgd);
 236 #else
 237         unsigned long (*pte_val)(pte_t);
 238         unsigned long (*pgd_val)(pgd_t);
 239
 240         pte_t (*make_pte)(unsigned long pte);
 241         pgd_t (*make_pgd)(unsigned long pgd);
 242 #endif
 243
 244 #ifdef CONFIG_HIGHPTE
 245         void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
 246 #endif
 247 };
 248
 249 /* This contains all the paravirt structures: we get a convenient
 250  * number for each function using the offset which we use to indicate
 251  * what to patch. */
 252 struct paravirt_patch_template
 253 {
 254         struct pv_init_ops pv_init_ops;
 255         struct pv_misc_ops pv_misc_ops;
 256         struct pv_time_ops pv_time_ops;
 257         struct pv_cpu_ops pv_cpu_ops;
 258         struct pv_irq_ops pv_irq_ops;
 259         struct pv_apic_ops pv_apic_ops;
 260         struct pv_mmu_ops pv_mmu_ops;
 261 };
 262
 263 extern struct pv_info pv_info;
 264 extern struct pv_init_ops pv_init_ops;
 265 extern struct pv_misc_ops pv_misc_ops;
 266 extern struct pv_time_ops pv_time_ops;
 267 extern struct pv_cpu_ops pv_cpu_ops;
 268 extern struct pv_irq_ops pv_irq_ops;
 269 extern struct pv_apic_ops pv_apic_ops;
 270 extern struct pv_mmu_ops pv_mmu_ops;
 271
 272 #define PARAVIRT_PATCH(x)                                       \
 273         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
 274
 275 #define paravirt_type(op)                               \
 276         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
 277         [paravirt_opptr] "m" (op)
 278 #define paravirt_clobber(clobber)               \
 279         [paravirt_clobber] "i" (clobber)
 280
 281 /*
 282  * Generate some code, and mark it as patchable by the
 283  * apply_paravirt() alternate instruction patcher.
 284  */
 285 #define _paravirt_alt(insn_string, type, clobber)       \
 286         "771:\n\t" insn_string "\n" "772:\n"            \
 287         ".pushsection .parainstructions,\"a\"\n"        \
 288         "  .long 771b\n"                                \
 289         "  .byte " type "\n"                            \
 290         "  .byte 772b-771b\n"                           \
 291         "  .short " clobber "\n"                        \
 292         ".popsection\n"
 293
 294 /* Generate patchable code, with the default asm parameters. */
 295 #define paravirt_alt(insn_string)                                       \
 296         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
 297
 298 unsigned paravirt_patch_nop(void);
 299 unsigned paravirt_patch_ignore(unsigned len);
 300 unsigned paravirt_patch_call(void *insnbuf,
 301                              const void *target, u16 tgt_clobbers,
 302                              unsigned long addr, u16 site_clobbers,
 303                              unsigned len);
 304 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
 305                             unsigned long addr, unsigned len);
 306 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
 307                                 unsigned long addr, unsigned len);
 308
 309 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
 310                               const char *start, const char *end);
 311
 312 int paravirt_disable_iospace(void);
 313
 314 /*
 315  * This generates an indirect call based on the operation type number.
 316  * The type number, computed in PARAVIRT_PATCH, is derived from the
 317  * offset into the paravirt_patch_template structure, and can therefore be
 318  * freely converted back into a structure offset.
 319  */
 320 #define PARAVIRT_CALL   "call *%[paravirt_opptr];"
 321
 322 /*
 323  * These macros are intended to wrap calls through one of the paravirt
 324  * ops structs, so that they can be later identified and patched at
 325  * runtime.
 326  *
 327  * Normally, a call to a pv_op function is a simple indirect call:
 328  * (paravirt_ops.operations)(args...).
 329  *
 330  * Unfortunately, this is a relatively slow operation for modern CPUs,
 331  * because it cannot necessarily determine what the destination
 332  * address is.  In this case, the address is a runtime constant, so at
 333  * the very least we can patch the call to e a simple direct call, or
 334  * ideally, patch an inline implementation into the callsite.  (Direct
 335  * calls are essentially free, because the call and return addresses
 336  * are completely predictable.)
 337  *
 338  * These macros rely on the standard gcc "regparm(3)" calling
 339  * convention, in which the first three arguments are placed in %eax,
 340  * %edx, %ecx (in that order), and the remaining arguments are placed
 341  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
 342  * to be modified (either clobbered or used for return values).
 343  *
 344  * The call instruction itself is marked by placing its start address
 345  * and size into the .parainstructions section, so that
 346  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
 347  * appropriate patching under the control of the backend pv_init_ops
 348  * implementation.
 349  *
 350  * Unfortunately there's no way to get gcc to generate the args setup
 351  * for the call, and then allow the call itself to be generated by an
 352  * inline asm.  Because of this, we must do the complete arg setup and
 353  * return value handling from within these macros.  This is fairly
 354  * cumbersome.
 355  *
 356  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
 357  * It could be extended to more arguments, but there would be little
 358  * to be gained from that.  For each number of arguments, there are
 359  * the two VCALL and CALL variants for void and non-void functions.
 360  *
 361  * When there is a return value, the invoker of the macro must specify
 362  * the return type.  The macro then uses sizeof() on that type to
 363  * determine whether its a 32 or 64 bit value, and places the return
 364  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
 365  * 64-bit).
 366  *
 367  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
 368  * in low,high order.
 369  *
 370  * Small structures are passed and returned in registers.  The macro
 371  * calling convention can't directly deal with this, so the wrapper
 372  * functions must do this.
 373  *
 374  * These PVOP_* macros are only defined within this header.  This
 375  * means that all uses must be wrapped in inline functions.  This also
 376  * makes sure the incoming and outgoing types are always correct.
 377  */
 378 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
 379         ({                                                              \
 380                 rettype __ret;                                          \
 381                 unsigned long __eax, __edx, __ecx;                      \
 382                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
 383                         asm volatile(pre                                \
 384                                      paravirt_alt(PARAVIRT_CALL)        \
 385                                      post                               \
 386                                      : "=a" (__eax), "=d" (__edx),      \
 387                                        "=c" (__ecx)                     \
 388                                      : paravirt_type(op),               \
 389                                        paravirt_clobber(CLBR_ANY),      \
 390                                        ##__VA_ARGS__                    \
 391                                      : "memory", "cc");                 \
 392                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
 393                 } else {                                                \
 394                         asm volatile(pre                                \
 395                                      paravirt_alt(PARAVIRT_CALL)        \
 396                                      post                               \
 397                                      : "=a" (__eax), "=d" (__edx),      \
 398                                        "=c" (__ecx)                     \
 399                                      : paravirt_type(op),               \
 400                                        paravirt_clobber(CLBR_ANY),      \
 401                                        ##__VA_ARGS__                    \
 402                                      : "memory", "cc");                 \
 403                         __ret = (rettype)__eax;                         \
 404                 }                                                       \
 405                 __ret;                                                  \
 406         })
 407 #define __PVOP_VCALL(op, pre, post, ...)                                \
 408         ({                                                              \
 409                 unsigned long __eax, __edx, __ecx;                      \
 410                 asm volatile(pre                                        \
 411                              paravirt_alt(PARAVIRT_CALL)                \
 412                              post                                       \
 413                              : "=a" (__eax), "=d" (__edx), "=c" (__ecx) \
 414                              : paravirt_type(op),                       \
 415                                paravirt_clobber(CLBR_ANY),              \
 416                                ##__VA_ARGS__                            \
 417                              : "memory", "cc");                         \
 418         })
 419
 420 #define PVOP_CALL0(rettype, op)                                         \
 421         __PVOP_CALL(rettype, op, "", "")
 422 #define PVOP_VCALL0(op)                                                 \
 423         __PVOP_VCALL(op, "", "")
 424
 425 #define PVOP_CALL1(rettype, op, arg1)                                   \
 426         __PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)))
 427 #define PVOP_VCALL1(op, arg1)                                           \
 428         __PVOP_VCALL(op, "", "", "0" ((u32)(arg1)))
 429
 430 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
 431         __PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)), "1" ((u32)(arg2)))
 432 #define PVOP_VCALL2(op, arg1, arg2)                                     \
 433         __PVOP_VCALL(op, "", "", "0" ((u32)(arg1)), "1" ((u32)(arg2)))
 434
 435 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
 436         __PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)),             \
 437                     "1"((u32)(arg2)), "2"((u32)(arg3)))
 438 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
 439         __PVOP_VCALL(op, "", "", "0" ((u32)(arg1)), "1"((u32)(arg2)),   \
 440                      "2"((u32)(arg3)))
 441
 442 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
 443         __PVOP_CALL(rettype, op,                                        \
 444                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 445                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
 446                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
 447 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
 448         __PVOP_VCALL(op,                                                \
 449                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
 450                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
 451                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
 452
 453 static inline int paravirt_enabled(void)
 454 {
 455         return pv_info.paravirt_enabled;
 456 }
 457
 458 static inline void load_esp0(struct tss_struct *tss,
 459                              struct thread_struct *thread)
 460 {
 461         PVOP_VCALL2(pv_cpu_ops.load_esp0, tss, thread);
 462 }
 463
 464 #define ARCH_SETUP                      pv_init_ops.arch_setup();
 465 static inline unsigned long get_wallclock(void)
 466 {
 467         return PVOP_CALL0(unsigned long, pv_time_ops.get_wallclock);
 468 }
 469
 470 static inline int set_wallclock(unsigned long nowtime)
 471 {
 472         return PVOP_CALL1(int, pv_time_ops.set_wallclock, nowtime);
 473 }
 474
 475 static inline void (*choose_time_init(void))(void)
 476 {
 477         return pv_time_ops.time_init;
 478 }
 479
 480 /* The paravirtualized CPUID instruction. */
 481 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
 482                            unsigned int *ecx, unsigned int *edx)
 483 {
 484         PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
 485 }
 486
 487 /*
 488  * These special macros can be used to get or set a debugging register
 489  */
 490 static inline unsigned long paravirt_get_debugreg(int reg)
 491 {
 492         return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
 493 }
 494 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
 495 static inline void set_debugreg(unsigned long val, int reg)
 496 {
 497         PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
 498 }
 499
 500 static inline void clts(void)
 501 {
 502         PVOP_VCALL0(pv_cpu_ops.clts);
 503 }
 504
 505 static inline unsigned long read_cr0(void)
 506 {
 507         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
 508 }
 509
 510 static inline void write_cr0(unsigned long x)
 511 {
 512         PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
 513 }
 514
 515 static inline unsigned long read_cr2(void)
 516 {
 517         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
 518 }
 519
 520 static inline void write_cr2(unsigned long x)
 521 {
 522         PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
 523 }
 524
 525 static inline unsigned long read_cr3(void)
 526 {
 527         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
 528 }
 529
 530 static inline void write_cr3(unsigned long x)
 531 {
 532         PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
 533 }
 534
 535 static inline unsigned long read_cr4(void)
 536 {
 537         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
 538 }
 539 static inline unsigned long read_cr4_safe(void)
 540 {
 541         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
 542 }
 543
 544 static inline void write_cr4(unsigned long x)
 545 {
 546         PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
 547 }
 548
 549 static inline void raw_safe_halt(void)
 550 {
 551         PVOP_VCALL0(pv_irq_ops.safe_halt);
 552 }
 553
 554 static inline void halt(void)
 555 {
 556         PVOP_VCALL0(pv_irq_ops.safe_halt);
 557 }
 558
 559 static inline void wbinvd(void)
 560 {
 561         PVOP_VCALL0(pv_cpu_ops.wbinvd);
 562 }
 563
 564 #define get_kernel_rpl()  (pv_info.kernel_rpl)
 565
 566 static inline u64 paravirt_read_msr(unsigned msr, int *err)
 567 {
 568         return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
 569 }
 570 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
 571 {
 572         return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
 573 }
 574
 575 /* These should all do BUG_ON(_err), but our headers are too tangled. */
 576 #define rdmsr(msr,val1,val2) do {               \
 577         int _err;                               \
 578         u64 _l = paravirt_read_msr(msr, &_err); \
 579         val1 = (u32)_l;                         \
 580         val2 = _l >> 32;                        \
 581 } while(0)
 582
 583 #define wrmsr(msr,val1,val2) do {               \
 584         paravirt_write_msr(msr, val1, val2);    \
 585 } while(0)
 586
 587 #define rdmsrl(msr,val) do {                    \
 588         int _err;                               \
 589         val = paravirt_read_msr(msr, &_err);    \
 590 } while(0)
 591
 592 #define wrmsrl(msr,val)         wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
 593 #define wrmsr_safe(msr,a,b)     paravirt_write_msr(msr, a, b)
 594
 595 /* rdmsr with exception handling */
 596 #define rdmsr_safe(msr,a,b) ({                  \
 597         int _err;                               \
 598         u64 _l = paravirt_read_msr(msr, &_err); \
 599         (*a) = (u32)_l;                         \
 600         (*b) = _l >> 32;                        \
 601         _err; })
 602
 603
 604 static inline u64 paravirt_read_tsc(void)
 605 {
 606         return PVOP_CALL0(u64, pv_cpu_ops.read_tsc);
 607 }
 608
 609 #define rdtscl(low) do {                        \
 610         u64 _l = paravirt_read_tsc();           \
 611         low = (int)_l;                          \
 612 } while(0)
 613
 614 #define rdtscll(val) (val = paravirt_read_tsc())
 615
 616 static inline unsigned long long paravirt_sched_clock(void)
 617 {
 618         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
 619 }
 620 #define calculate_cpu_khz() (pv_time_ops.get_cpu_khz())
 621
 622 #define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
 623
 624 static inline unsigned long long paravirt_read_pmc(int counter)
 625 {
 626         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
 627 }
 628
 629 #define rdpmc(counter,low,high) do {            \
 630         u64 _l = paravirt_read_pmc(counter);    \
 631         low = (u32)_l;                          \
 632         high = _l >> 32;                        \
 633 } while(0)
 634
 635 static inline void load_TR_desc(void)
 636 {
 637         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
 638 }
 639 static inline void load_gdt(const struct Xgt_desc_struct *dtr)
 640 {
 641         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
 642 }
 643 static inline void load_idt(const struct Xgt_desc_struct *dtr)
 644 {
 645         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
 646 }
 647 static inline void set_ldt(const void *addr, unsigned entries)
 648 {
 649         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
 650 }
 651 static inline void store_gdt(struct Xgt_desc_struct *dtr)
 652 {
 653         PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
 654 }
 655 static inline void store_idt(struct Xgt_desc_struct *dtr)
 656 {
 657         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
 658 }
 659 static inline unsigned long paravirt_store_tr(void)
 660 {
 661         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
 662 }
 663 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 664 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 665 {
 666         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
 667 }
 668 static inline void write_ldt_entry(void *dt, int entry, u32 low, u32 high)
 669 {
 670         PVOP_VCALL4(pv_cpu_ops.write_ldt_entry, dt, entry, low, high);
 671 }
 672 static inline void write_gdt_entry(void *dt, int entry, u32 low, u32 high)
 673 {
 674         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, low, high);
 675 }
 676 static inline void write_idt_entry(void *dt, int entry, u32 low, u32 high)
 677 {
 678         PVOP_VCALL4(pv_cpu_ops.write_idt_entry, dt, entry, low, high);
 679 }
 680 static inline void set_iopl_mask(unsigned mask)
 681 {
 682         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
 683 }
 684
 685 /* The paravirtualized I/O functions */
 686 static inline void slow_down_io(void) {
 687         pv_cpu_ops.io_delay();
 688 #ifdef REALLY_SLOW_IO
 689         pv_cpu_ops.io_delay();
 690         pv_cpu_ops.io_delay();
 691         pv_cpu_ops.io_delay();
 692 #endif
 693 }
 694
 695 #ifdef CONFIG_X86_LOCAL_APIC
 696 /*
 697  * Basic functions accessing APICs.
 698  */
 699 static inline void apic_write(unsigned long reg, unsigned long v)
 700 {
 701         PVOP_VCALL2(pv_apic_ops.apic_write, reg, v);
 702 }
 703
 704 static inline void apic_write_atomic(unsigned long reg, unsigned long v)
 705 {
 706         PVOP_VCALL2(pv_apic_ops.apic_write_atomic, reg, v);
 707 }
 708
 709 static inline unsigned long apic_read(unsigned long reg)
 710 {
 711         return PVOP_CALL1(unsigned long, pv_apic_ops.apic_read, reg);
 712 }
 713
 714 static inline void setup_boot_clock(void)
 715 {
 716         PVOP_VCALL0(pv_apic_ops.setup_boot_clock);
 717 }
 718
 719 static inline void setup_secondary_clock(void)
 720 {
 721         PVOP_VCALL0(pv_apic_ops.setup_secondary_clock);
 722 }
 723 #endif
 724
 725 static inline void paravirt_post_allocator_init(void)
 726 {
 727         if (pv_init_ops.post_allocator_init)
 728                 (*pv_init_ops.post_allocator_init)();
 729 }
 730
 731 static inline void paravirt_pagetable_setup_start(pgd_t *base)
 732 {
 733         (*pv_mmu_ops.pagetable_setup_start)(base);
 734 }
 735
 736 static inline void paravirt_pagetable_setup_done(pgd_t *base)
 737 {
 738         (*pv_mmu_ops.pagetable_setup_done)(base);
 739 }
 740
 741 #ifdef CONFIG_SMP
 742 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
 743                                     unsigned long start_esp)
 744 {
 745         PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
 746                     phys_apicid, start_eip, start_esp);
 747 }
 748 #endif
 749
 750 static inline void paravirt_activate_mm(struct mm_struct *prev,
 751                                         struct mm_struct *next)
 752 {
 753         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
 754 }
 755
 756 static inline void arch_dup_mmap(struct mm_struct *oldmm,
 757                                  struct mm_struct *mm)
 758 {
 759         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
 760 }
 761
 762 static inline void arch_exit_mmap(struct mm_struct *mm)
 763 {
 764         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
 765 }
 766
 767 static inline void __flush_tlb(void)
 768 {
 769         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
 770 }
 771 static inline void __flush_tlb_global(void)
 772 {
 773         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
 774 }
 775 static inline void __flush_tlb_single(unsigned long addr)
 776 {
 777         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
 778 }
 779
 780 static inline void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
 781                                     unsigned long va)
 782 {
 783         PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, &cpumask, mm, va);
 784 }
 785
 786 static inline void paravirt_alloc_pt(struct mm_struct *mm, unsigned pfn)
 787 {
 788         PVOP_VCALL2(pv_mmu_ops.alloc_pt, mm, pfn);
 789 }
 790 static inline void paravirt_release_pt(unsigned pfn)
 791 {
 792         PVOP_VCALL1(pv_mmu_ops.release_pt, pfn);
 793 }
 794
 795 static inline void paravirt_alloc_pd(unsigned pfn)
 796 {
 797         PVOP_VCALL1(pv_mmu_ops.alloc_pd, pfn);
 798 }
 799
 800 static inline void paravirt_alloc_pd_clone(unsigned pfn, unsigned clonepfn,
 801                                            unsigned start, unsigned count)
 802 {
 803         PVOP_VCALL4(pv_mmu_ops.alloc_pd_clone, pfn, clonepfn, start, count);
 804 }
 805 static inline void paravirt_release_pd(unsigned pfn)
 806 {
 807         PVOP_VCALL1(pv_mmu_ops.release_pd, pfn);
 808 }
 809
 810 #ifdef CONFIG_HIGHPTE
 811 static inline void *kmap_atomic_pte(struct page *page, enum km_type type)
 812 {
 813         unsigned long ret;
 814         ret = PVOP_CALL2(unsigned long, pv_mmu_ops.kmap_atomic_pte, page, type);
 815         return (void *)ret;
 816 }
 817 #endif
 818
 819 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
 820                               pte_t *ptep)
 821 {
 822         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
 823 }
 824
 825 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
 826                                     pte_t *ptep)
 827 {
 828         PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
 829 }
 830
 831 #ifdef CONFIG_X86_PAE
 832 static inline pte_t __pte(unsigned long long val)
 833 {
 834         unsigned long long ret = PVOP_CALL2(unsigned long long,
 835                                             pv_mmu_ops.make_pte,
 836                                             val, val >> 32);
 837         return (pte_t) { ret, ret >> 32 };
 838 }
 839
 840 static inline pmd_t __pmd(unsigned long long val)
 841 {
 842         return (pmd_t) { PVOP_CALL2(unsigned long long, pv_mmu_ops.make_pmd,
 843                                     val, val >> 32) };
 844 }
 845
 846 static inline pgd_t __pgd(unsigned long long val)
 847 {
 848         return (pgd_t) { PVOP_CALL2(unsigned long long, pv_mmu_ops.make_pgd,
 849                                     val, val >> 32) };
 850 }
 851
 852 static inline unsigned long long pte_val(pte_t x)
 853 {
 854         return PVOP_CALL2(unsigned long long, pv_mmu_ops.pte_val,
 855                           x.pte_low, x.pte_high);
 856 }
 857
 858 static inline unsigned long long pmd_val(pmd_t x)
 859 {
 860         return PVOP_CALL2(unsigned long long, pv_mmu_ops.pmd_val,
 861                           x.pmd, x.pmd >> 32);
 862 }
 863
 864 static inline unsigned long long pgd_val(pgd_t x)
 865 {
 866         return PVOP_CALL2(unsigned long long, pv_mmu_ops.pgd_val,
 867                           x.pgd, x.pgd >> 32);
 868 }
 869
 870 static inline void set_pte(pte_t *ptep, pte_t pteval)
 871 {
 872         PVOP_VCALL3(pv_mmu_ops.set_pte, ptep, pteval.pte_low, pteval.pte_high);
 873 }
 874
 875 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 876                               pte_t *ptep, pte_t pteval)
 877 {
 878         /* 5 arg words */
 879         pv_mmu_ops.set_pte_at(mm, addr, ptep, pteval);
 880 }
 881
 882 static inline void set_pte_atomic(pte_t *ptep, pte_t pteval)
 883 {
 884         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
 885                     pteval.pte_low, pteval.pte_high);
 886 }
 887
 888 static inline void set_pte_present(struct mm_struct *mm, unsigned long addr,
 889                                    pte_t *ptep, pte_t pte)
 890 {
 891         /* 5 arg words */
 892         pv_mmu_ops.set_pte_present(mm, addr, ptep, pte);
 893 }
 894
 895 static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
 896 {
 897         PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp,
 898                     pmdval.pmd, pmdval.pmd >> 32);
 899 }
 900
 901 static inline void set_pud(pud_t *pudp, pud_t pudval)
 902 {
 903         PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
 904                     pudval.pgd.pgd, pudval.pgd.pgd >> 32);
 905 }
 906
 907 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 908 {
 909         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
 910 }
 911
 912 static inline void pmd_clear(pmd_t *pmdp)
 913 {
 914         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
 915 }
 916
 917 #else  /* !CONFIG_X86_PAE */
 918
 919 static inline pte_t __pte(unsigned long val)
 920 {
 921         return (pte_t) { PVOP_CALL1(unsigned long, pv_mmu_ops.make_pte, val) };
 922 }
 923
 924 static inline pgd_t __pgd(unsigned long val)
 925 {
 926         return (pgd_t) { PVOP_CALL1(unsigned long, pv_mmu_ops.make_pgd, val) };
 927 }
 928
 929 static inline unsigned long pte_val(pte_t x)
 930 {
 931         return PVOP_CALL1(unsigned long, pv_mmu_ops.pte_val, x.pte_low);
 932 }
 933
 934 static inline unsigned long pgd_val(pgd_t x)
 935 {
 936         return PVOP_CALL1(unsigned long, pv_mmu_ops.pgd_val, x.pgd);
 937 }
 938
 939 static inline void set_pte(pte_t *ptep, pte_t pteval)
 940 {
 941         PVOP_VCALL2(pv_mmu_ops.set_pte, ptep, pteval.pte_low);
 942 }
 943
 944 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 945                               pte_t *ptep, pte_t pteval)
 946 {
 947         PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pteval.pte_low);
 948 }
 949
 950 static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
 951 {
 952         PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, pmdval.pud.pgd.pgd);
 953 }
 954 #endif  /* CONFIG_X86_PAE */
 955
 956 #define  __HAVE_ARCH_ENTER_LAZY_CPU_MODE
 957 static inline void arch_enter_lazy_cpu_mode(void)
 958 {
 959         PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_CPU);
 960 }
 961
 962 static inline void arch_leave_lazy_cpu_mode(void)
 963 {
 964         PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_NONE);
 965 }
 966
 967 static inline void arch_flush_lazy_cpu_mode(void)
 968 {
 969         PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_FLUSH);
 970 }
 971
 972
 973 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 974 static inline void arch_enter_lazy_mmu_mode(void)
 975 {
 976         PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_MMU);
 977 }
 978
 979 static inline void arch_leave_lazy_mmu_mode(void)
 980 {
 981         PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_NONE);
 982 }
 983
 984 static inline void arch_flush_lazy_mmu_mode(void)
 985 {
 986         PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_FLUSH);
 987 }
 988
 989 void _paravirt_nop(void);
 990 #define paravirt_nop    ((void *)_paravirt_nop)
 991
 992 /* These all sit in the .parainstructions section to tell us what to patch. */
 993 struct paravirt_patch_site {
 994         u8 *instr;              /* original instructions */
 995         u8 instrtype;           /* type of this instruction */
 996         u8 len;                 /* length of original instruction */
 997         u16 clobbers;           /* what registers you may clobber */
 998 };
 999
1000 extern struct paravirt_patch_site __parainstructions[],
1001         __parainstructions_end[];
1002
1003 static inline unsigned long __raw_local_save_flags(void)
1004 {
1005         unsigned long f;
1006
1007         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1008                                   PARAVIRT_CALL
1009                                   "popl %%edx; popl %%ecx")
1010                      : "=a"(f)
1011                      : paravirt_type(pv_irq_ops.save_fl),
1012                        paravirt_clobber(CLBR_EAX)
1013                      : "memory", "cc");
1014         return f;
1015 }
1016
1017 static inline void raw_local_irq_restore(unsigned long f)
1018 {
1019         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1020                                   PARAVIRT_CALL
1021                                   "popl %%edx; popl %%ecx")
1022                      : "=a"(f)
1023                      : "0"(f),
1024                        paravirt_type(pv_irq_ops.restore_fl),
1025                        paravirt_clobber(CLBR_EAX)
1026                      : "memory", "cc");
1027 }
1028
1029 static inline void raw_local_irq_disable(void)
1030 {
1031         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1032                                   PARAVIRT_CALL
1033                                   "popl %%edx; popl %%ecx")
1034                      :
1035                      : paravirt_type(pv_irq_ops.irq_disable),
1036                        paravirt_clobber(CLBR_EAX)
1037                      : "memory", "eax", "cc");
1038 }
1039
1040 static inline void raw_local_irq_enable(void)
1041 {
1042         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1043                                   PARAVIRT_CALL
1044                                   "popl %%edx; popl %%ecx")
1045                      :
1046                      : paravirt_type(pv_irq_ops.irq_enable),
1047                        paravirt_clobber(CLBR_EAX)
1048                      : "memory", "eax", "cc");
1049 }
1050
1051 static inline unsigned long __raw_local_irq_save(void)
1052 {
1053         unsigned long f;
1054
1055         f = __raw_local_save_flags();
1056         raw_local_irq_disable();
1057         return f;
1058 }
1059
1060 #define CLI_STRING                                                      \
1061         _paravirt_alt("pushl %%ecx; pushl %%edx;"                       \
1062                       "call *%[paravirt_cli_opptr];"                    \
1063                       "popl %%edx; popl %%ecx",                         \
1064                       "%c[paravirt_cli_type]", "%c[paravirt_clobber]")
1065
1066 #define STI_STRING                                                      \
1067         _paravirt_alt("pushl %%ecx; pushl %%edx;"                       \
1068                       "call *%[paravirt_sti_opptr];"                    \
1069                       "popl %%edx; popl %%ecx",                         \
1070                       "%c[paravirt_sti_type]", "%c[paravirt_clobber]")
1071
1072 #define CLI_STI_CLOBBERS , "%eax"
1073 #define CLI_STI_INPUT_ARGS                                              \
1074         ,                                                               \
1075         [paravirt_cli_type] "i" (PARAVIRT_PATCH(pv_irq_ops.irq_disable)),               \
1076         [paravirt_cli_opptr] "m" (pv_irq_ops.irq_disable),              \
1077         [paravirt_sti_type] "i" (PARAVIRT_PATCH(pv_irq_ops.irq_enable)),                \
1078         [paravirt_sti_opptr] "m" (pv_irq_ops.irq_enable),               \
1079         paravirt_clobber(CLBR_EAX)
1080
1081 /* Make sure as little as possible of this mess escapes. */
1082 #undef PARAVIRT_CALL
1083 #undef __PVOP_CALL
1084 #undef __PVOP_VCALL
1085 #undef PVOP_VCALL0
1086 #undef PVOP_CALL0
1087 #undef PVOP_VCALL1
1088 #undef PVOP_CALL1
1089 #undef PVOP_VCALL2
1090 #undef PVOP_CALL2
1091 #undef PVOP_VCALL3
1092 #undef PVOP_CALL3
1093 #undef PVOP_VCALL4
1094 #undef PVOP_CALL4
1095
1096 #else  /* __ASSEMBLY__ */
1097
1098 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 4)
1099
1100 #define PARA_SITE(ptype, clobbers, ops)         \
1101 771:;                                           \
1102         ops;                                    \
1103 772:;                                           \
1104         .pushsection .parainstructions,"a";     \
1105          .long 771b;                            \
1106          .byte ptype;                           \
1107          .byte 772b-771b;                       \
1108          .short clobbers;                       \
1109         .popsection
1110
1111 #define INTERRUPT_RETURN                                                \
1112         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
1113                   jmp *%cs:pv_cpu_ops+PV_CPU_iret)
1114
1115 #define DISABLE_INTERRUPTS(clobbers)                                    \
1116         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
1117                   pushl %eax; pushl %ecx; pushl %edx;                   \
1118                   call *%cs:pv_irq_ops+PV_IRQ_irq_disable;              \
1119                   popl %edx; popl %ecx; popl %eax)                      \
1120
1121 #define ENABLE_INTERRUPTS(clobbers)                                     \
1122         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
1123                   pushl %eax; pushl %ecx; pushl %edx;                   \
1124                   call *%cs:pv_irq_ops+PV_IRQ_irq_enable;               \
1125                   popl %edx; popl %ecx; popl %eax)
1126
1127 #define ENABLE_INTERRUPTS_SYSEXIT                                              \
1128         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit), CLBR_NONE,\
1129                   jmp *%cs:pv_cpu_ops+PV_CPU_irq_enable_sysexit)
1130
1131 #define GET_CR0_INTO_EAX                        \
1132         push %ecx; push %edx;                   \
1133         call *pv_cpu_ops+PV_CPU_read_cr0;       \
1134         pop %edx; pop %ecx
1135
1136 #endif /* __ASSEMBLY__ */
1137 #endif /* CONFIG_PARAVIRT */
1138 #endif  /* __ASM_PARAVIRT_H */