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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 #include <asm/desc_defs.h>
21
22 struct page;
23 struct thread_struct;
24 struct desc_ptr;
25 struct tss_struct;
26 struct mm_struct;
27 struct desc_struct;
28
29 /* general info */
30 struct pv_info {
31         unsigned int kernel_rpl;
32         int shared_kernel_pmd;
33         int paravirt_enabled;
34         const char *name;
35 };
36
37 struct pv_init_ops {
38         /*
39          * Patch may replace one of the defined code sequences with
40          * arbitrary code, subject to the same register constraints.
41          * This generally means the code is not free to clobber any
42          * registers other than EAX.  The patch function should return
43          * the number of bytes of code generated, as we nop pad the
44          * rest in generic code.
45          */
46         unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
47                           unsigned long addr, unsigned len);
48
49         /* Basic arch-specific setup */
50         void (*arch_setup)(void);
51         char *(*memory_setup)(void);
52         void (*post_allocator_init)(void);
53
54         /* Print a banner to identify the environment */
55         void (*banner)(void);
56 };
57
58
59 struct pv_lazy_ops {
60         /* Set deferred update mode, used for batching operations. */
61         void (*enter)(void);
62         void (*leave)(void);
63 };
64
65 struct pv_time_ops {
66         void (*time_init)(void);
67
68         /* Set and set time of day */
69         unsigned long (*get_wallclock)(void);
70         int (*set_wallclock)(unsigned long);
71
72         unsigned long long (*sched_clock)(void);
73         unsigned long (*get_cpu_khz)(void);
74 };
75
76 struct pv_cpu_ops {
77         /* hooks for various privileged instructions */
78         unsigned long (*get_debugreg)(int regno);
79         void (*set_debugreg)(int regno, unsigned long value);
80
81         void (*clts)(void);
82
83         unsigned long (*read_cr0)(void);
84         void (*write_cr0)(unsigned long);
85
86         unsigned long (*read_cr4_safe)(void);
87         unsigned long (*read_cr4)(void);
88         void (*write_cr4)(unsigned long);
89
90         /* Segment descriptor handling */
91         void (*load_tr_desc)(void);
92         void (*load_gdt)(const struct desc_ptr *);
93         void (*load_idt)(const struct desc_ptr *);
94         void (*store_gdt)(struct desc_ptr *);
95         void (*store_idt)(struct desc_ptr *);
96         void (*set_ldt)(const void *desc, unsigned entries);
97         unsigned long (*store_tr)(void);
98         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
99         void (*write_ldt_entry)(struct desc_struct *,
100                                 int entrynum, u32 low, u32 high);
101         void (*write_gdt_entry)(struct desc_struct *,
102                                 int entrynum, const void *desc, int size);
103         void (*write_idt_entry)(gate_desc *,
104                                 int entrynum, const gate_desc *gate);
105         void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
106
107         void (*set_iopl_mask)(unsigned mask);
108
109         void (*wbinvd)(void);
110         void (*io_delay)(void);
111
112         /* cpuid emulation, mostly so that caps bits can be disabled */
113         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
114                       unsigned int *ecx, unsigned int *edx);
115
116         /* MSR, PMC and TSR operations.
117            err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
118         u64 (*read_msr)(unsigned int msr, int *err);
119         int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
120
121         u64 (*read_tsc)(void);
122         u64 (*read_pmc)(int counter);
123
124         /* These two are jmp to, not actually called. */
125         void (*irq_enable_syscall_ret)(void);
126         void (*iret)(void);
127
128         struct pv_lazy_ops lazy_mode;
129 };
130
131 struct pv_irq_ops {
132         void (*init_IRQ)(void);
133
134         /*
135          * Get/set interrupt state.  save_fl and restore_fl are only
136          * expected to use X86_EFLAGS_IF; all other bits
137          * returned from save_fl are undefined, and may be ignored by
138          * restore_fl.
139          */
140         unsigned long (*save_fl)(void);
141         void (*restore_fl)(unsigned long);
142         void (*irq_disable)(void);
143         void (*irq_enable)(void);
144         void (*safe_halt)(void);
145         void (*halt)(void);
146 };
147
148 struct pv_apic_ops {
149 #ifdef CONFIG_X86_LOCAL_APIC
150         /*
151          * Direct APIC operations, principally for VMI.  Ideally
152          * these shouldn't be in this interface.
153          */
154         void (*apic_write)(unsigned long reg, u32 v);
155         void (*apic_write_atomic)(unsigned long reg, u32 v);
156         u32 (*apic_read)(unsigned long reg);
157         void (*setup_boot_clock)(void);
158         void (*setup_secondary_clock)(void);
159
160         void (*startup_ipi_hook)(int phys_apicid,
161                                  unsigned long start_eip,
162                                  unsigned long start_esp);
163 #endif
164 };
165
166 struct pv_mmu_ops {
167         /*
168          * Called before/after init_mm pagetable setup. setup_start
169          * may reset %cr3, and may pre-install parts of the pagetable;
170          * pagetable setup is expected to preserve any existing
171          * mapping.
172          */
173         void (*pagetable_setup_start)(pgd_t *pgd_base);
174         void (*pagetable_setup_done)(pgd_t *pgd_base);
175
176         unsigned long (*read_cr2)(void);
177         void (*write_cr2)(unsigned long);
178
179         unsigned long (*read_cr3)(void);
180         void (*write_cr3)(unsigned long);
181
182         /*
183          * Hooks for intercepting the creation/use/destruction of an
184          * mm_struct.
185          */
186         void (*activate_mm)(struct mm_struct *prev,
187                             struct mm_struct *next);
188         void (*dup_mmap)(struct mm_struct *oldmm,
189                          struct mm_struct *mm);
190         void (*exit_mmap)(struct mm_struct *mm);
191
192
193         /* TLB operations */
194         void (*flush_tlb_user)(void);
195         void (*flush_tlb_kernel)(void);
196         void (*flush_tlb_single)(unsigned long addr);
197         void (*flush_tlb_others)(const cpumask_t *cpus, struct mm_struct *mm,
198                                  unsigned long va);
199
200         /* Hooks for allocating/releasing pagetable pages */
201         void (*alloc_pt)(struct mm_struct *mm, u32 pfn);
202         void (*alloc_pd)(u32 pfn);
203         void (*alloc_pd_clone)(u32 pfn, u32 clonepfn, u32 start, u32 count);
204         void (*release_pt)(u32 pfn);
205         void (*release_pd)(u32 pfn);
206
207         /* Pagetable manipulation functions */
208         void (*set_pte)(pte_t *ptep, pte_t pteval);
209         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
210                            pte_t *ptep, pte_t pteval);
211         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
212         void (*pte_update)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
213         void (*pte_update_defer)(struct mm_struct *mm,
214                                  unsigned long addr, pte_t *ptep);
215
216 #ifdef CONFIG_X86_PAE
217         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
218         void (*set_pte_present)(struct mm_struct *mm, unsigned long addr,
219                                 pte_t *ptep, pte_t pte);
220         void (*set_pud)(pud_t *pudp, pud_t pudval);
221         void (*pte_clear)(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
222         void (*pmd_clear)(pmd_t *pmdp);
223
224         unsigned long long (*pte_val)(pte_t);
225         unsigned long long (*pmd_val)(pmd_t);
226         unsigned long long (*pgd_val)(pgd_t);
227
228         pte_t (*make_pte)(unsigned long long pte);
229         pmd_t (*make_pmd)(unsigned long long pmd);
230         pgd_t (*make_pgd)(unsigned long long pgd);
231 #else
232         unsigned long (*pte_val)(pte_t);
233         unsigned long (*pgd_val)(pgd_t);
234
235         pte_t (*make_pte)(unsigned long pte);
236         pgd_t (*make_pgd)(unsigned long pgd);
237 #endif
238
239 #ifdef CONFIG_HIGHPTE
240         void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
241 #endif
242
243         struct pv_lazy_ops lazy_mode;
244 };
245
246 /* This contains all the paravirt structures: we get a convenient
247  * number for each function using the offset which we use to indicate
248  * what to patch. */
249 struct paravirt_patch_template
250 {
251         struct pv_init_ops pv_init_ops;
252         struct pv_time_ops pv_time_ops;
253         struct pv_cpu_ops pv_cpu_ops;
254         struct pv_irq_ops pv_irq_ops;
255         struct pv_apic_ops pv_apic_ops;
256         struct pv_mmu_ops pv_mmu_ops;
257 };
258
259 extern struct pv_info pv_info;
260 extern struct pv_init_ops pv_init_ops;
261 extern struct pv_time_ops pv_time_ops;
262 extern struct pv_cpu_ops pv_cpu_ops;
263 extern struct pv_irq_ops pv_irq_ops;
264 extern struct pv_apic_ops pv_apic_ops;
265 extern struct pv_mmu_ops pv_mmu_ops;
266
267 #define PARAVIRT_PATCH(x)                                       \
268         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
269
270 #define paravirt_type(op)                               \
271         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
272         [paravirt_opptr] "m" (op)
273 #define paravirt_clobber(clobber)               \
274         [paravirt_clobber] "i" (clobber)
275
276 /*
277  * Generate some code, and mark it as patchable by the
278  * apply_paravirt() alternate instruction patcher.
279  */
280 #define _paravirt_alt(insn_string, type, clobber)       \
281         "771:\n\t" insn_string "\n" "772:\n"            \
282         ".pushsection .parainstructions,\"a\"\n"        \
283         "  .long 771b\n"                                \
284         "  .byte " type "\n"                            \
285         "  .byte 772b-771b\n"                           \
286         "  .short " clobber "\n"                        \
287         ".popsection\n"
288
289 /* Generate patchable code, with the default asm parameters. */
290 #define paravirt_alt(insn_string)                                       \
291         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
292
293 unsigned paravirt_patch_nop(void);
294 unsigned paravirt_patch_ignore(unsigned len);
295 unsigned paravirt_patch_call(void *insnbuf,
296                              const void *target, u16 tgt_clobbers,
297                              unsigned long addr, u16 site_clobbers,
298                              unsigned len);
299 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
300                             unsigned long addr, unsigned len);
301 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
302                                 unsigned long addr, unsigned len);
303
304 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
305                               const char *start, const char *end);
306
307 int paravirt_disable_iospace(void);
308
309 /*
310  * This generates an indirect call based on the operation type number.
311  * The type number, computed in PARAVIRT_PATCH, is derived from the
312  * offset into the paravirt_patch_template structure, and can therefore be
313  * freely converted back into a structure offset.
314  */
315 #define PARAVIRT_CALL   "call *%[paravirt_opptr];"
316
317 /*
318  * These macros are intended to wrap calls through one of the paravirt
319  * ops structs, so that they can be later identified and patched at
320  * runtime.
321  *
322  * Normally, a call to a pv_op function is a simple indirect call:
323  * (paravirt_ops.operations)(args...).
324  *
325  * Unfortunately, this is a relatively slow operation for modern CPUs,
326  * because it cannot necessarily determine what the destination
327  * address is.  In this case, the address is a runtime constant, so at
328  * the very least we can patch the call to e a simple direct call, or
329  * ideally, patch an inline implementation into the callsite.  (Direct
330  * calls are essentially free, because the call and return addresses
331  * are completely predictable.)
332  *
333  * These macros rely on the standard gcc "regparm(3)" calling
334  * convention, in which the first three arguments are placed in %eax,
335  * %edx, %ecx (in that order), and the remaining arguments are placed
336  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
337  * to be modified (either clobbered or used for return values).
338  *
339  * The call instruction itself is marked by placing its start address
340  * and size into the .parainstructions section, so that
341  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
342  * appropriate patching under the control of the backend pv_init_ops
343  * implementation.
344  *
345  * Unfortunately there's no way to get gcc to generate the args setup
346  * for the call, and then allow the call itself to be generated by an
347  * inline asm.  Because of this, we must do the complete arg setup and
348  * return value handling from within these macros.  This is fairly
349  * cumbersome.
350  *
351  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
352  * It could be extended to more arguments, but there would be little
353  * to be gained from that.  For each number of arguments, there are
354  * the two VCALL and CALL variants for void and non-void functions.
355  *
356  * When there is a return value, the invoker of the macro must specify
357  * the return type.  The macro then uses sizeof() on that type to
358  * determine whether its a 32 or 64 bit value, and places the return
359  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
360  * 64-bit).
361  *
362  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
363  * in low,high order.
364  *
365  * Small structures are passed and returned in registers.  The macro
366  * calling convention can't directly deal with this, so the wrapper
367  * functions must do this.
368  *
369  * These PVOP_* macros are only defined within this header.  This
370  * means that all uses must be wrapped in inline functions.  This also
371  * makes sure the incoming and outgoing types are always correct.
372  */
373 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
374         ({                                                              \
375                 rettype __ret;                                          \
376                 unsigned long __eax, __edx, __ecx;                      \
377                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
378                         asm volatile(pre                                \
379                                      paravirt_alt(PARAVIRT_CALL)        \
380                                      post                               \
381                                      : "=a" (__eax), "=d" (__edx),      \
382                                        "=c" (__ecx)                     \
383                                      : paravirt_type(op),               \
384                                        paravirt_clobber(CLBR_ANY),      \
385                                        ##__VA_ARGS__                    \
386                                      : "memory", "cc");                 \
387                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
388                 } else {                                                \
389                         asm volatile(pre                                \
390                                      paravirt_alt(PARAVIRT_CALL)        \
391                                      post                               \
392                                      : "=a" (__eax), "=d" (__edx),      \
393                                        "=c" (__ecx)                     \
394                                      : paravirt_type(op),               \
395                                        paravirt_clobber(CLBR_ANY),      \
396                                        ##__VA_ARGS__                    \
397                                      : "memory", "cc");                 \
398                         __ret = (rettype)__eax;                         \
399                 }                                                       \
400                 __ret;                                                  \
401         })
402 #define __PVOP_VCALL(op, pre, post, ...)                                \
403         ({                                                              \
404                 unsigned long __eax, __edx, __ecx;                      \
405                 asm volatile(pre                                        \
406                              paravirt_alt(PARAVIRT_CALL)                \
407                              post                                       \
408                              : "=a" (__eax), "=d" (__edx), "=c" (__ecx) \
409                              : paravirt_type(op),                       \
410                                paravirt_clobber(CLBR_ANY),              \
411                                ##__VA_ARGS__                            \
412                              : "memory", "cc");                         \
413         })
414
415 #define PVOP_CALL0(rettype, op)                                         \
416         __PVOP_CALL(rettype, op, "", "")
417 #define PVOP_VCALL0(op)                                                 \
418         __PVOP_VCALL(op, "", "")
419
420 #define PVOP_CALL1(rettype, op, arg1)                                   \
421         __PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)))
422 #define PVOP_VCALL1(op, arg1)                                           \
423         __PVOP_VCALL(op, "", "", "0" ((u32)(arg1)))
424
425 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
426         __PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)), "1" ((u32)(arg2)))
427 #define PVOP_VCALL2(op, arg1, arg2)                                     \
428         __PVOP_VCALL(op, "", "", "0" ((u32)(arg1)), "1" ((u32)(arg2)))
429
430 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
431         __PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)),             \
432                     "1"((u32)(arg2)), "2"((u32)(arg3)))
433 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
434         __PVOP_VCALL(op, "", "", "0" ((u32)(arg1)), "1"((u32)(arg2)),   \
435                      "2"((u32)(arg3)))
436
437 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
438         __PVOP_CALL(rettype, op,                                        \
439                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
440                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
441                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
442 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
443         __PVOP_VCALL(op,                                                \
444                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
445                     "0" ((u32)(arg1)), "1" ((u32)(arg2)),               \
446                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
447
448 static inline int paravirt_enabled(void)
449 {
450         return pv_info.paravirt_enabled;
451 }
452
453 static inline void load_sp0(struct tss_struct *tss,
454                              struct thread_struct *thread)
455 {
456         PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
457 }
458
459 #define ARCH_SETUP                      pv_init_ops.arch_setup();
460 static inline unsigned long get_wallclock(void)
461 {
462         return PVOP_CALL0(unsigned long, pv_time_ops.get_wallclock);
463 }
464
465 static inline int set_wallclock(unsigned long nowtime)
466 {
467         return PVOP_CALL1(int, pv_time_ops.set_wallclock, nowtime);
468 }
469
470 static inline void (*choose_time_init(void))(void)
471 {
472         return pv_time_ops.time_init;
473 }
474
475 /* The paravirtualized CPUID instruction. */
476 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
477                            unsigned int *ecx, unsigned int *edx)
478 {
479         PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
480 }
481
482 /*
483  * These special macros can be used to get or set a debugging register
484  */
485 static inline unsigned long paravirt_get_debugreg(int reg)
486 {
487         return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
488 }
489 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
490 static inline void set_debugreg(unsigned long val, int reg)
491 {
492         PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
493 }
494
495 static inline void clts(void)
496 {
497         PVOP_VCALL0(pv_cpu_ops.clts);
498 }
499
500 static inline unsigned long read_cr0(void)
501 {
502         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
503 }
504
505 static inline void write_cr0(unsigned long x)
506 {
507         PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
508 }
509
510 static inline unsigned long read_cr2(void)
511 {
512         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
513 }
514
515 static inline void write_cr2(unsigned long x)
516 {
517         PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
518 }
519
520 static inline unsigned long read_cr3(void)
521 {
522         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
523 }
524
525 static inline void write_cr3(unsigned long x)
526 {
527         PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
528 }
529
530 static inline unsigned long read_cr4(void)
531 {
532         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
533 }
534 static inline unsigned long read_cr4_safe(void)
535 {
536         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
537 }
538
539 static inline void write_cr4(unsigned long x)
540 {
541         PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
542 }
543
544 static inline void raw_safe_halt(void)
545 {
546         PVOP_VCALL0(pv_irq_ops.safe_halt);
547 }
548
549 static inline void halt(void)
550 {
551         PVOP_VCALL0(pv_irq_ops.safe_halt);
552 }
553
554 static inline void wbinvd(void)
555 {
556         PVOP_VCALL0(pv_cpu_ops.wbinvd);
557 }
558
559 #define get_kernel_rpl()  (pv_info.kernel_rpl)
560
561 static inline u64 paravirt_read_msr(unsigned msr, int *err)
562 {
563         return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
564 }
565 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
566 {
567         return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
568 }
569
570 /* These should all do BUG_ON(_err), but our headers are too tangled. */
571 #define rdmsr(msr,val1,val2) do {               \
572         int _err;                               \
573         u64 _l = paravirt_read_msr(msr, &_err); \
574         val1 = (u32)_l;                         \
575         val2 = _l >> 32;                        \
576 } while(0)
577
578 #define wrmsr(msr,val1,val2) do {               \
579         paravirt_write_msr(msr, val1, val2);    \
580 } while(0)
581
582 #define rdmsrl(msr,val) do {                    \
583         int _err;                               \
584         val = paravirt_read_msr(msr, &_err);    \
585 } while(0)
586
587 #define wrmsrl(msr,val)         wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
588 #define wrmsr_safe(msr,a,b)     paravirt_write_msr(msr, a, b)
589
590 /* rdmsr with exception handling */
591 #define rdmsr_safe(msr,a,b) ({                  \
592         int _err;                               \
593         u64 _l = paravirt_read_msr(msr, &_err); \
594         (*a) = (u32)_l;                         \
595         (*b) = _l >> 32;                        \
596         _err; })
597
598
599 static inline u64 paravirt_read_tsc(void)
600 {
601         return PVOP_CALL0(u64, pv_cpu_ops.read_tsc);
602 }
603
604 #define rdtscl(low) do {                        \
605         u64 _l = paravirt_read_tsc();           \
606         low = (int)_l;                          \
607 } while(0)
608
609 #define rdtscll(val) (val = paravirt_read_tsc())
610
611 static inline unsigned long long paravirt_sched_clock(void)
612 {
613         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
614 }
615 #define calculate_cpu_khz() (pv_time_ops.get_cpu_khz())
616
617 #define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
618
619 static inline unsigned long long paravirt_read_pmc(int counter)
620 {
621         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
622 }
623
624 #define rdpmc(counter,low,high) do {            \
625         u64 _l = paravirt_read_pmc(counter);    \
626         low = (u32)_l;                          \
627         high = _l >> 32;                        \
628 } while(0)
629
630 static inline void load_TR_desc(void)
631 {
632         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
633 }
634 static inline void load_gdt(const struct desc_ptr *dtr)
635 {
636         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
637 }
638 static inline void load_idt(const struct desc_ptr *dtr)
639 {
640         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
641 }
642 static inline void set_ldt(const void *addr, unsigned entries)
643 {
644         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
645 }
646 static inline void store_gdt(struct desc_ptr *dtr)
647 {
648         PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
649 }
650 static inline void store_idt(struct desc_ptr *dtr)
651 {
652         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
653 }
654 static inline unsigned long paravirt_store_tr(void)
655 {
656         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
657 }
658 #define store_tr(tr)    ((tr) = paravirt_store_tr())
659 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
660 {
661         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
662 }
663 static inline void write_ldt_entry(void *dt, int entry, u32 low, u32 high)
664 {
665         PVOP_VCALL4(pv_cpu_ops.write_ldt_entry, dt, entry, low, high);
666 }
667
668 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
669                                    void *desc, int type)
670 {
671         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
672 }
673
674 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
675 {
676         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
677 }
678 static inline void set_iopl_mask(unsigned mask)
679 {
680         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
681 }
682
683 /* The paravirtualized I/O functions */
684 static inline void slow_down_io(void) {
685         pv_cpu_ops.io_delay();
686 #ifdef REALLY_SLOW_IO
687         pv_cpu_ops.io_delay();
688         pv_cpu_ops.io_delay();
689         pv_cpu_ops.io_delay();
690 #endif
691 }
692
693 #ifdef CONFIG_X86_LOCAL_APIC
694 /*
695  * Basic functions accessing APICs.
696  */
697 static inline void apic_write(unsigned long reg, u32 v)
698 {
699         PVOP_VCALL2(pv_apic_ops.apic_write, reg, v);
700 }
701
702 static inline void apic_write_atomic(unsigned long reg, u32 v)
703 {
704         PVOP_VCALL2(pv_apic_ops.apic_write_atomic, reg, v);
705 }
706
707 static inline u32 apic_read(unsigned long reg)
708 {
709         return PVOP_CALL1(unsigned long, pv_apic_ops.apic_read, reg);
710 }
711
712 static inline void setup_boot_clock(void)
713 {
714         PVOP_VCALL0(pv_apic_ops.setup_boot_clock);
715 }
716
717 static inline void setup_secondary_clock(void)
718 {
719         PVOP_VCALL0(pv_apic_ops.setup_secondary_clock);
720 }
721 #endif
722
723 static inline void paravirt_post_allocator_init(void)
724 {
725         if (pv_init_ops.post_allocator_init)
726                 (*pv_init_ops.post_allocator_init)();
727 }
728
729 static inline void paravirt_pagetable_setup_start(pgd_t *base)
730 {
731         (*pv_mmu_ops.pagetable_setup_start)(base);
732 }
733
734 static inline void paravirt_pagetable_setup_done(pgd_t *base)
735 {
736         (*pv_mmu_ops.pagetable_setup_done)(base);
737 }
738
739 #ifdef CONFIG_SMP
740 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
741                                     unsigned long start_esp)
742 {
743         PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
744                     phys_apicid, start_eip, start_esp);
745 }
746 #endif
747
748 static inline void paravirt_activate_mm(struct mm_struct *prev,
749                                         struct mm_struct *next)
750 {
751         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
752 }
753
754 static inline void arch_dup_mmap(struct mm_struct *oldmm,
755                                  struct mm_struct *mm)
756 {
757         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
758 }
759
760 static inline void arch_exit_mmap(struct mm_struct *mm)
761 {
762         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
763 }
764
765 static inline void __flush_tlb(void)
766 {
767         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
768 }
769 static inline void __flush_tlb_global(void)
770 {
771         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
772 }
773 static inline void __flush_tlb_single(unsigned long addr)
774 {
775         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
776 }
777
778 static inline void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
779                                     unsigned long va)
780 {
781         PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, &cpumask, mm, va);
782 }
783
784 static inline void paravirt_alloc_pt(struct mm_struct *mm, unsigned pfn)
785 {
786         PVOP_VCALL2(pv_mmu_ops.alloc_pt, mm, pfn);
787 }
788 static inline void paravirt_release_pt(unsigned pfn)
789 {
790         PVOP_VCALL1(pv_mmu_ops.release_pt, pfn);
791 }
792
793 static inline void paravirt_alloc_pd(unsigned pfn)
794 {
795         PVOP_VCALL1(pv_mmu_ops.alloc_pd, pfn);
796 }
797
798 static inline void paravirt_alloc_pd_clone(unsigned pfn, unsigned clonepfn,
799                                            unsigned start, unsigned count)
800 {
801         PVOP_VCALL4(pv_mmu_ops.alloc_pd_clone, pfn, clonepfn, start, count);
802 }
803 static inline void paravirt_release_pd(unsigned pfn)
804 {
805         PVOP_VCALL1(pv_mmu_ops.release_pd, pfn);
806 }
807
808 #ifdef CONFIG_HIGHPTE
809 static inline void *kmap_atomic_pte(struct page *page, enum km_type type)
810 {
811         unsigned long ret;
812         ret = PVOP_CALL2(unsigned long, pv_mmu_ops.kmap_atomic_pte, page, type);
813         return (void *)ret;
814 }
815 #endif
816
817 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
818                               pte_t *ptep)
819 {
820         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
821 }
822
823 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
824                                     pte_t *ptep)
825 {
826         PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
827 }
828
829 #ifdef CONFIG_X86_PAE
830 static inline pte_t __pte(unsigned long long val)
831 {
832         unsigned long long ret = PVOP_CALL2(unsigned long long,
833                                             pv_mmu_ops.make_pte,
834                                             val, val >> 32);
835         return (pte_t) { ret, ret >> 32 };
836 }
837
838 static inline pmd_t __pmd(unsigned long long val)
839 {
840         return (pmd_t) { PVOP_CALL2(unsigned long long, pv_mmu_ops.make_pmd,
841                                     val, val >> 32) };
842 }
843
844 static inline pgd_t __pgd(unsigned long long val)
845 {
846         return (pgd_t) { PVOP_CALL2(unsigned long long, pv_mmu_ops.make_pgd,
847                                     val, val >> 32) };
848 }
849
850 static inline unsigned long long pte_val(pte_t x)
851 {
852         return PVOP_CALL2(unsigned long long, pv_mmu_ops.pte_val,
853                           x.pte_low, x.pte_high);
854 }
855
856 static inline unsigned long long pmd_val(pmd_t x)
857 {
858         return PVOP_CALL2(unsigned long long, pv_mmu_ops.pmd_val,
859                           x.pmd, x.pmd >> 32);
860 }
861
862 static inline unsigned long long pgd_val(pgd_t x)
863 {
864         return PVOP_CALL2(unsigned long long, pv_mmu_ops.pgd_val,
865                           x.pgd, x.pgd >> 32);
866 }
867
868 static inline void set_pte(pte_t *ptep, pte_t pteval)
869 {
870         PVOP_VCALL3(pv_mmu_ops.set_pte, ptep, pteval.pte_low, pteval.pte_high);
871 }
872
873 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
874                               pte_t *ptep, pte_t pteval)
875 {
876         /* 5 arg words */
877         pv_mmu_ops.set_pte_at(mm, addr, ptep, pteval);
878 }
879
880 static inline void set_pte_atomic(pte_t *ptep, pte_t pteval)
881 {
882         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
883                     pteval.pte_low, pteval.pte_high);
884 }
885
886 static inline void set_pte_present(struct mm_struct *mm, unsigned long addr,
887                                    pte_t *ptep, pte_t pte)
888 {
889         /* 5 arg words */
890         pv_mmu_ops.set_pte_present(mm, addr, ptep, pte);
891 }
892
893 static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
894 {
895         PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp,
896                     pmdval.pmd, pmdval.pmd >> 32);
897 }
898
899 static inline void set_pud(pud_t *pudp, pud_t pudval)
900 {
901         PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
902                     pudval.pgd.pgd, pudval.pgd.pgd >> 32);
903 }
904
905 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
906 {
907         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
908 }
909
910 static inline void pmd_clear(pmd_t *pmdp)
911 {
912         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
913 }
914
915 #else  /* !CONFIG_X86_PAE */
916
917 static inline pte_t __pte(unsigned long val)
918 {
919         return (pte_t) { PVOP_CALL1(unsigned long, pv_mmu_ops.make_pte, val) };
920 }
921
922 static inline pgd_t __pgd(unsigned long val)
923 {
924         return (pgd_t) { PVOP_CALL1(unsigned long, pv_mmu_ops.make_pgd, val) };
925 }
926
927 static inline unsigned long pte_val(pte_t x)
928 {
929         return PVOP_CALL1(unsigned long, pv_mmu_ops.pte_val, x.pte_low);
930 }
931
932 static inline unsigned long pgd_val(pgd_t x)
933 {
934         return PVOP_CALL1(unsigned long, pv_mmu_ops.pgd_val, x.pgd);
935 }
936
937 static inline void set_pte(pte_t *ptep, pte_t pteval)
938 {
939         PVOP_VCALL2(pv_mmu_ops.set_pte, ptep, pteval.pte_low);
940 }
941
942 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
943                               pte_t *ptep, pte_t pteval)
944 {
945         PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pteval.pte_low);
946 }
947
948 static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval)
949 {
950         PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, pmdval.pud.pgd.pgd);
951 }
952 #endif  /* CONFIG_X86_PAE */
953
954 /* Lazy mode for batching updates / context switch */
955 enum paravirt_lazy_mode {
956         PARAVIRT_LAZY_NONE,
957         PARAVIRT_LAZY_MMU,
958         PARAVIRT_LAZY_CPU,
959 };
960
961 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
962 void paravirt_enter_lazy_cpu(void);
963 void paravirt_leave_lazy_cpu(void);
964 void paravirt_enter_lazy_mmu(void);
965 void paravirt_leave_lazy_mmu(void);
966 void paravirt_leave_lazy(enum paravirt_lazy_mode mode);
967
968 #define  __HAVE_ARCH_ENTER_LAZY_CPU_MODE
969 static inline void arch_enter_lazy_cpu_mode(void)
970 {
971         PVOP_VCALL0(pv_cpu_ops.lazy_mode.enter);
972 }
973
974 static inline void arch_leave_lazy_cpu_mode(void)
975 {
976         PVOP_VCALL0(pv_cpu_ops.lazy_mode.leave);
977 }
978
979 static inline void arch_flush_lazy_cpu_mode(void)
980 {
981         if (unlikely(paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU)) {
982                 arch_leave_lazy_cpu_mode();
983                 arch_enter_lazy_cpu_mode();
984         }
985 }
986
987
988 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
989 static inline void arch_enter_lazy_mmu_mode(void)
990 {
991         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
992 }
993
994 static inline void arch_leave_lazy_mmu_mode(void)
995 {
996         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
997 }
998
999 static inline void arch_flush_lazy_mmu_mode(void)
1000 {
1001         if (unlikely(paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU)) {
1002                 arch_leave_lazy_mmu_mode();
1003                 arch_enter_lazy_mmu_mode();
1004         }
1005 }
1006
1007 void _paravirt_nop(void);
1008 #define paravirt_nop    ((void *)_paravirt_nop)
1009
1010 /* These all sit in the .parainstructions section to tell us what to patch. */
1011 struct paravirt_patch_site {
1012         u8 *instr;              /* original instructions */
1013         u8 instrtype;           /* type of this instruction */
1014         u8 len;                 /* length of original instruction */
1015         u16 clobbers;           /* what registers you may clobber */
1016 };
1017
1018 extern struct paravirt_patch_site __parainstructions[],
1019         __parainstructions_end[];
1020
1021 static inline unsigned long __raw_local_save_flags(void)
1022 {
1023         unsigned long f;
1024
1025         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1026                                   PARAVIRT_CALL
1027                                   "popl %%edx; popl %%ecx")
1028                      : "=a"(f)
1029                      : paravirt_type(pv_irq_ops.save_fl),
1030                        paravirt_clobber(CLBR_EAX)
1031                      : "memory", "cc");
1032         return f;
1033 }
1034
1035 static inline void raw_local_irq_restore(unsigned long f)
1036 {
1037         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1038                                   PARAVIRT_CALL
1039                                   "popl %%edx; popl %%ecx")
1040                      : "=a"(f)
1041                      : "0"(f),
1042                        paravirt_type(pv_irq_ops.restore_fl),
1043                        paravirt_clobber(CLBR_EAX)
1044                      : "memory", "cc");
1045 }
1046
1047 static inline void raw_local_irq_disable(void)
1048 {
1049         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1050                                   PARAVIRT_CALL
1051                                   "popl %%edx; popl %%ecx")
1052                      :
1053                      : paravirt_type(pv_irq_ops.irq_disable),
1054                        paravirt_clobber(CLBR_EAX)
1055                      : "memory", "eax", "cc");
1056 }
1057
1058 static inline void raw_local_irq_enable(void)
1059 {
1060         asm volatile(paravirt_alt("pushl %%ecx; pushl %%edx;"
1061                                   PARAVIRT_CALL
1062                                   "popl %%edx; popl %%ecx")
1063                      :
1064                      : paravirt_type(pv_irq_ops.irq_enable),
1065                        paravirt_clobber(CLBR_EAX)
1066                      : "memory", "eax", "cc");
1067 }
1068
1069 static inline unsigned long __raw_local_irq_save(void)
1070 {
1071         unsigned long f;
1072
1073         f = __raw_local_save_flags();
1074         raw_local_irq_disable();
1075         return f;
1076 }
1077
1078 #define CLI_STRING                                                      \
1079         _paravirt_alt("pushl %%ecx; pushl %%edx;"                       \
1080                       "call *%[paravirt_cli_opptr];"                    \
1081                       "popl %%edx; popl %%ecx",                         \
1082                       "%c[paravirt_cli_type]", "%c[paravirt_clobber]")
1083
1084 #define STI_STRING                                                      \
1085         _paravirt_alt("pushl %%ecx; pushl %%edx;"                       \
1086                       "call *%[paravirt_sti_opptr];"                    \
1087                       "popl %%edx; popl %%ecx",                         \
1088                       "%c[paravirt_sti_type]", "%c[paravirt_clobber]")
1089
1090 #define CLI_STI_CLOBBERS , "%eax"
1091 #define CLI_STI_INPUT_ARGS                                              \
1092         ,                                                               \
1093         [paravirt_cli_type] "i" (PARAVIRT_PATCH(pv_irq_ops.irq_disable)),               \
1094         [paravirt_cli_opptr] "m" (pv_irq_ops.irq_disable),              \
1095         [paravirt_sti_type] "i" (PARAVIRT_PATCH(pv_irq_ops.irq_enable)),                \
1096         [paravirt_sti_opptr] "m" (pv_irq_ops.irq_enable),               \
1097         paravirt_clobber(CLBR_EAX)
1098
1099 /* Make sure as little as possible of this mess escapes. */
1100 #undef PARAVIRT_CALL
1101 #undef __PVOP_CALL
1102 #undef __PVOP_VCALL
1103 #undef PVOP_VCALL0
1104 #undef PVOP_CALL0
1105 #undef PVOP_VCALL1
1106 #undef PVOP_CALL1
1107 #undef PVOP_VCALL2
1108 #undef PVOP_CALL2
1109 #undef PVOP_VCALL3
1110 #undef PVOP_CALL3
1111 #undef PVOP_VCALL4
1112 #undef PVOP_CALL4
1113
1114 #else  /* __ASSEMBLY__ */
1115
1116 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 4)
1117
1118 #define PARA_SITE(ptype, clobbers, ops)         \
1119 771:;                                           \
1120         ops;                                    \
1121 772:;                                           \
1122         .pushsection .parainstructions,"a";     \
1123          .long 771b;                            \
1124          .byte ptype;                           \
1125          .byte 772b-771b;                       \
1126          .short clobbers;                       \
1127         .popsection
1128
1129 #define INTERRUPT_RETURN                                                \
1130         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
1131                   jmp *%cs:pv_cpu_ops+PV_CPU_iret)
1132
1133 #define DISABLE_INTERRUPTS(clobbers)                                    \
1134         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
1135                   pushl %eax; pushl %ecx; pushl %edx;                   \
1136                   call *%cs:pv_irq_ops+PV_IRQ_irq_disable;              \
1137                   popl %edx; popl %ecx; popl %eax)                      \
1138
1139 #define ENABLE_INTERRUPTS(clobbers)                                     \
1140         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
1141                   pushl %eax; pushl %ecx; pushl %edx;                   \
1142                   call *%cs:pv_irq_ops+PV_IRQ_irq_enable;               \
1143                   popl %edx; popl %ecx; popl %eax)
1144
1145 #define ENABLE_INTERRUPTS_SYSCALL_RET                                   \
1146         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_syscall_ret),\
1147                   CLBR_NONE,                                            \
1148                   jmp *%cs:pv_cpu_ops+PV_CPU_irq_enable_syscall_ret)
1149
1150 #define GET_CR0_INTO_EAX                        \
1151         push %ecx; push %edx;                   \
1152         call *pv_cpu_ops+PV_CPU_read_cr0;       \
1153         pop %edx; pop %ecx
1154
1155 #endif /* __ASSEMBLY__ */
1156 #endif /* CONFIG_PARAVIRT */
1157 #endif  /* __ASM_PARAVIRT_H */