Merge tag 'bug-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
[linux-2.6.git] / arch / x86 / include / asm / paravirt.h
1 #ifndef _ASM_X86_PARAVIRT_H
2 #define _ASM_X86_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/pgtable_types.h>
8 #include <asm/asm.h>
9
10 #include <asm/paravirt_types.h>
11
12 #ifndef __ASSEMBLY__
13 #include <linux/bug.h>
14 #include <linux/types.h>
15 #include <linux/cpumask.h>
16
17 static inline int paravirt_enabled(void)
18 {
19         return pv_info.paravirt_enabled;
20 }
21
22 static inline void load_sp0(struct tss_struct *tss,
23                              struct thread_struct *thread)
24 {
25         PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
26 }
27
28 /* The paravirtualized CPUID instruction. */
29 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
30                            unsigned int *ecx, unsigned int *edx)
31 {
32         PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
33 }
34
35 /*
36  * These special macros can be used to get or set a debugging register
37  */
38 static inline unsigned long paravirt_get_debugreg(int reg)
39 {
40         return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
41 }
42 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
43 static inline void set_debugreg(unsigned long val, int reg)
44 {
45         PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
46 }
47
48 static inline void clts(void)
49 {
50         PVOP_VCALL0(pv_cpu_ops.clts);
51 }
52
53 static inline unsigned long read_cr0(void)
54 {
55         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
56 }
57
58 static inline void write_cr0(unsigned long x)
59 {
60         PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
61 }
62
63 static inline unsigned long read_cr2(void)
64 {
65         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
66 }
67
68 static inline void write_cr2(unsigned long x)
69 {
70         PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
71 }
72
73 static inline unsigned long read_cr3(void)
74 {
75         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
76 }
77
78 static inline void write_cr3(unsigned long x)
79 {
80         PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
81 }
82
83 static inline unsigned long read_cr4(void)
84 {
85         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
86 }
87 static inline unsigned long read_cr4_safe(void)
88 {
89         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
90 }
91
92 static inline void write_cr4(unsigned long x)
93 {
94         PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
95 }
96
97 #ifdef CONFIG_X86_64
98 static inline unsigned long read_cr8(void)
99 {
100         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
101 }
102
103 static inline void write_cr8(unsigned long x)
104 {
105         PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
106 }
107 #endif
108
109 static inline void arch_safe_halt(void)
110 {
111         PVOP_VCALL0(pv_irq_ops.safe_halt);
112 }
113
114 static inline void halt(void)
115 {
116         PVOP_VCALL0(pv_irq_ops.halt);
117 }
118
119 static inline void wbinvd(void)
120 {
121         PVOP_VCALL0(pv_cpu_ops.wbinvd);
122 }
123
124 #define get_kernel_rpl()  (pv_info.kernel_rpl)
125
126 static inline u64 paravirt_read_msr(unsigned msr, int *err)
127 {
128         return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
129 }
130
131 static inline int paravirt_rdmsr_regs(u32 *regs)
132 {
133         return PVOP_CALL1(int, pv_cpu_ops.rdmsr_regs, regs);
134 }
135
136 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
137 {
138         return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
139 }
140
141 static inline int paravirt_wrmsr_regs(u32 *regs)
142 {
143         return PVOP_CALL1(int, pv_cpu_ops.wrmsr_regs, regs);
144 }
145
146 /* These should all do BUG_ON(_err), but our headers are too tangled. */
147 #define rdmsr(msr, val1, val2)                  \
148 do {                                            \
149         int _err;                               \
150         u64 _l = paravirt_read_msr(msr, &_err); \
151         val1 = (u32)_l;                         \
152         val2 = _l >> 32;                        \
153 } while (0)
154
155 #define wrmsr(msr, val1, val2)                  \
156 do {                                            \
157         paravirt_write_msr(msr, val1, val2);    \
158 } while (0)
159
160 #define rdmsrl(msr, val)                        \
161 do {                                            \
162         int _err;                               \
163         val = paravirt_read_msr(msr, &_err);    \
164 } while (0)
165
166 #define wrmsrl(msr, val)        wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
167 #define wrmsr_safe(msr, a, b)   paravirt_write_msr(msr, a, b)
168
169 /* rdmsr with exception handling */
170 #define rdmsr_safe(msr, a, b)                   \
171 ({                                              \
172         int _err;                               \
173         u64 _l = paravirt_read_msr(msr, &_err); \
174         (*a) = (u32)_l;                         \
175         (*b) = _l >> 32;                        \
176         _err;                                   \
177 })
178
179 #define rdmsr_safe_regs(regs)   paravirt_rdmsr_regs(regs)
180 #define wrmsr_safe_regs(regs)   paravirt_wrmsr_regs(regs)
181
182 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
183 {
184         int err;
185
186         *p = paravirt_read_msr(msr, &err);
187         return err;
188 }
189 static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
190 {
191         u32 gprs[8] = { 0 };
192         int err;
193
194         gprs[1] = msr;
195         gprs[7] = 0x9c5a203a;
196
197         err = paravirt_rdmsr_regs(gprs);
198
199         *p = gprs[0] | ((u64)gprs[2] << 32);
200
201         return err;
202 }
203
204 static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val)
205 {
206         u32 gprs[8] = { 0 };
207
208         gprs[0] = (u32)val;
209         gprs[1] = msr;
210         gprs[2] = val >> 32;
211         gprs[7] = 0x9c5a203a;
212
213         return paravirt_wrmsr_regs(gprs);
214 }
215
216 static inline u64 paravirt_read_tsc(void)
217 {
218         return PVOP_CALL0(u64, pv_cpu_ops.read_tsc);
219 }
220
221 #define rdtscl(low)                             \
222 do {                                            \
223         u64 _l = paravirt_read_tsc();           \
224         low = (int)_l;                          \
225 } while (0)
226
227 #define rdtscll(val) (val = paravirt_read_tsc())
228
229 static inline unsigned long long paravirt_sched_clock(void)
230 {
231         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
232 }
233
234 struct static_key;
235 extern struct static_key paravirt_steal_enabled;
236 extern struct static_key paravirt_steal_rq_enabled;
237
238 static inline u64 paravirt_steal_clock(int cpu)
239 {
240         return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
241 }
242
243 static inline unsigned long long paravirt_read_pmc(int counter)
244 {
245         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
246 }
247
248 #define rdpmc(counter, low, high)               \
249 do {                                            \
250         u64 _l = paravirt_read_pmc(counter);    \
251         low = (u32)_l;                          \
252         high = _l >> 32;                        \
253 } while (0)
254
255 static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
256 {
257         return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
258 }
259
260 #define rdtscp(low, high, aux)                          \
261 do {                                                    \
262         int __aux;                                      \
263         unsigned long __val = paravirt_rdtscp(&__aux);  \
264         (low) = (u32)__val;                             \
265         (high) = (u32)(__val >> 32);                    \
266         (aux) = __aux;                                  \
267 } while (0)
268
269 #define rdtscpll(val, aux)                              \
270 do {                                                    \
271         unsigned long __aux;                            \
272         val = paravirt_rdtscp(&__aux);                  \
273         (aux) = __aux;                                  \
274 } while (0)
275
276 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
277 {
278         PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
279 }
280
281 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
282 {
283         PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
284 }
285
286 static inline void load_TR_desc(void)
287 {
288         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
289 }
290 static inline void load_gdt(const struct desc_ptr *dtr)
291 {
292         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
293 }
294 static inline void load_idt(const struct desc_ptr *dtr)
295 {
296         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
297 }
298 static inline void set_ldt(const void *addr, unsigned entries)
299 {
300         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
301 }
302 static inline void store_gdt(struct desc_ptr *dtr)
303 {
304         PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
305 }
306 static inline void store_idt(struct desc_ptr *dtr)
307 {
308         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
309 }
310 static inline unsigned long paravirt_store_tr(void)
311 {
312         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
313 }
314 #define store_tr(tr)    ((tr) = paravirt_store_tr())
315 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
316 {
317         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
318 }
319
320 #ifdef CONFIG_X86_64
321 static inline void load_gs_index(unsigned int gs)
322 {
323         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
324 }
325 #endif
326
327 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
328                                    const void *desc)
329 {
330         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
331 }
332
333 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
334                                    void *desc, int type)
335 {
336         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
337 }
338
339 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
340 {
341         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
342 }
343 static inline void set_iopl_mask(unsigned mask)
344 {
345         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
346 }
347
348 /* The paravirtualized I/O functions */
349 static inline void slow_down_io(void)
350 {
351         pv_cpu_ops.io_delay();
352 #ifdef REALLY_SLOW_IO
353         pv_cpu_ops.io_delay();
354         pv_cpu_ops.io_delay();
355         pv_cpu_ops.io_delay();
356 #endif
357 }
358
359 #ifdef CONFIG_SMP
360 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
361                                     unsigned long start_esp)
362 {
363         PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
364                     phys_apicid, start_eip, start_esp);
365 }
366 #endif
367
368 static inline void paravirt_activate_mm(struct mm_struct *prev,
369                                         struct mm_struct *next)
370 {
371         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
372 }
373
374 static inline void arch_dup_mmap(struct mm_struct *oldmm,
375                                  struct mm_struct *mm)
376 {
377         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
378 }
379
380 static inline void arch_exit_mmap(struct mm_struct *mm)
381 {
382         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
383 }
384
385 static inline void __flush_tlb(void)
386 {
387         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
388 }
389 static inline void __flush_tlb_global(void)
390 {
391         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
392 }
393 static inline void __flush_tlb_single(unsigned long addr)
394 {
395         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
396 }
397
398 static inline void flush_tlb_others(const struct cpumask *cpumask,
399                                     struct mm_struct *mm,
400                                     unsigned long va)
401 {
402         PVOP_VCALL3(pv_mmu_ops.flush_tlb_others, cpumask, mm, va);
403 }
404
405 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
406 {
407         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
408 }
409
410 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
411 {
412         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
413 }
414
415 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
416 {
417         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
418 }
419 static inline void paravirt_release_pte(unsigned long pfn)
420 {
421         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
422 }
423
424 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
425 {
426         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
427 }
428
429 static inline void paravirt_release_pmd(unsigned long pfn)
430 {
431         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
432 }
433
434 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
435 {
436         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
437 }
438 static inline void paravirt_release_pud(unsigned long pfn)
439 {
440         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
441 }
442
443 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
444                               pte_t *ptep)
445 {
446         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
447 }
448 static inline void pmd_update(struct mm_struct *mm, unsigned long addr,
449                               pmd_t *pmdp)
450 {
451         PVOP_VCALL3(pv_mmu_ops.pmd_update, mm, addr, pmdp);
452 }
453
454 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
455                                     pte_t *ptep)
456 {
457         PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
458 }
459
460 static inline void pmd_update_defer(struct mm_struct *mm, unsigned long addr,
461                                     pmd_t *pmdp)
462 {
463         PVOP_VCALL3(pv_mmu_ops.pmd_update_defer, mm, addr, pmdp);
464 }
465
466 static inline pte_t __pte(pteval_t val)
467 {
468         pteval_t ret;
469
470         if (sizeof(pteval_t) > sizeof(long))
471                 ret = PVOP_CALLEE2(pteval_t,
472                                    pv_mmu_ops.make_pte,
473                                    val, (u64)val >> 32);
474         else
475                 ret = PVOP_CALLEE1(pteval_t,
476                                    pv_mmu_ops.make_pte,
477                                    val);
478
479         return (pte_t) { .pte = ret };
480 }
481
482 static inline pteval_t pte_val(pte_t pte)
483 {
484         pteval_t ret;
485
486         if (sizeof(pteval_t) > sizeof(long))
487                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
488                                    pte.pte, (u64)pte.pte >> 32);
489         else
490                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
491                                    pte.pte);
492
493         return ret;
494 }
495
496 static inline pgd_t __pgd(pgdval_t val)
497 {
498         pgdval_t ret;
499
500         if (sizeof(pgdval_t) > sizeof(long))
501                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
502                                    val, (u64)val >> 32);
503         else
504                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
505                                    val);
506
507         return (pgd_t) { ret };
508 }
509
510 static inline pgdval_t pgd_val(pgd_t pgd)
511 {
512         pgdval_t ret;
513
514         if (sizeof(pgdval_t) > sizeof(long))
515                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
516                                     pgd.pgd, (u64)pgd.pgd >> 32);
517         else
518                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
519                                     pgd.pgd);
520
521         return ret;
522 }
523
524 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
525 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
526                                            pte_t *ptep)
527 {
528         pteval_t ret;
529
530         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
531                          mm, addr, ptep);
532
533         return (pte_t) { .pte = ret };
534 }
535
536 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
537                                            pte_t *ptep, pte_t pte)
538 {
539         if (sizeof(pteval_t) > sizeof(long))
540                 /* 5 arg words */
541                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
542         else
543                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
544                             mm, addr, ptep, pte.pte);
545 }
546
547 static inline void set_pte(pte_t *ptep, pte_t pte)
548 {
549         if (sizeof(pteval_t) > sizeof(long))
550                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
551                             pte.pte, (u64)pte.pte >> 32);
552         else
553                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
554                             pte.pte);
555 }
556
557 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
558                               pte_t *ptep, pte_t pte)
559 {
560         if (sizeof(pteval_t) > sizeof(long))
561                 /* 5 arg words */
562                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
563         else
564                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
565 }
566
567 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
568 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
569                               pmd_t *pmdp, pmd_t pmd)
570 {
571         if (sizeof(pmdval_t) > sizeof(long))
572                 /* 5 arg words */
573                 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
574         else
575                 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
576                             native_pmd_val(pmd));
577 }
578 #endif
579
580 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
581 {
582         pmdval_t val = native_pmd_val(pmd);
583
584         if (sizeof(pmdval_t) > sizeof(long))
585                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
586         else
587                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
588 }
589
590 #if PAGETABLE_LEVELS >= 3
591 static inline pmd_t __pmd(pmdval_t val)
592 {
593         pmdval_t ret;
594
595         if (sizeof(pmdval_t) > sizeof(long))
596                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
597                                    val, (u64)val >> 32);
598         else
599                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
600                                    val);
601
602         return (pmd_t) { ret };
603 }
604
605 static inline pmdval_t pmd_val(pmd_t pmd)
606 {
607         pmdval_t ret;
608
609         if (sizeof(pmdval_t) > sizeof(long))
610                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
611                                     pmd.pmd, (u64)pmd.pmd >> 32);
612         else
613                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
614                                     pmd.pmd);
615
616         return ret;
617 }
618
619 static inline void set_pud(pud_t *pudp, pud_t pud)
620 {
621         pudval_t val = native_pud_val(pud);
622
623         if (sizeof(pudval_t) > sizeof(long))
624                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
625                             val, (u64)val >> 32);
626         else
627                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
628                             val);
629 }
630 #if PAGETABLE_LEVELS == 4
631 static inline pud_t __pud(pudval_t val)
632 {
633         pudval_t ret;
634
635         if (sizeof(pudval_t) > sizeof(long))
636                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
637                                    val, (u64)val >> 32);
638         else
639                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
640                                    val);
641
642         return (pud_t) { ret };
643 }
644
645 static inline pudval_t pud_val(pud_t pud)
646 {
647         pudval_t ret;
648
649         if (sizeof(pudval_t) > sizeof(long))
650                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
651                                     pud.pud, (u64)pud.pud >> 32);
652         else
653                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
654                                     pud.pud);
655
656         return ret;
657 }
658
659 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
660 {
661         pgdval_t val = native_pgd_val(pgd);
662
663         if (sizeof(pgdval_t) > sizeof(long))
664                 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
665                             val, (u64)val >> 32);
666         else
667                 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
668                             val);
669 }
670
671 static inline void pgd_clear(pgd_t *pgdp)
672 {
673         set_pgd(pgdp, __pgd(0));
674 }
675
676 static inline void pud_clear(pud_t *pudp)
677 {
678         set_pud(pudp, __pud(0));
679 }
680
681 #endif  /* PAGETABLE_LEVELS == 4 */
682
683 #endif  /* PAGETABLE_LEVELS >= 3 */
684
685 #ifdef CONFIG_X86_PAE
686 /* Special-case pte-setting operations for PAE, which can't update a
687    64-bit pte atomically */
688 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
689 {
690         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
691                     pte.pte, pte.pte >> 32);
692 }
693
694 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
695                              pte_t *ptep)
696 {
697         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
698 }
699
700 static inline void pmd_clear(pmd_t *pmdp)
701 {
702         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
703 }
704 #else  /* !CONFIG_X86_PAE */
705 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
706 {
707         set_pte(ptep, pte);
708 }
709
710 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
711                              pte_t *ptep)
712 {
713         set_pte_at(mm, addr, ptep, __pte(0));
714 }
715
716 static inline void pmd_clear(pmd_t *pmdp)
717 {
718         set_pmd(pmdp, __pmd(0));
719 }
720 #endif  /* CONFIG_X86_PAE */
721
722 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
723 static inline void arch_start_context_switch(struct task_struct *prev)
724 {
725         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
726 }
727
728 static inline void arch_end_context_switch(struct task_struct *next)
729 {
730         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
731 }
732
733 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
734 static inline void arch_enter_lazy_mmu_mode(void)
735 {
736         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
737 }
738
739 static inline void arch_leave_lazy_mmu_mode(void)
740 {
741         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
742 }
743
744 void arch_flush_lazy_mmu_mode(void);
745
746 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
747                                 phys_addr_t phys, pgprot_t flags)
748 {
749         pv_mmu_ops.set_fixmap(idx, phys, flags);
750 }
751
752 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
753
754 static inline int arch_spin_is_locked(struct arch_spinlock *lock)
755 {
756         return PVOP_CALL1(int, pv_lock_ops.spin_is_locked, lock);
757 }
758
759 static inline int arch_spin_is_contended(struct arch_spinlock *lock)
760 {
761         return PVOP_CALL1(int, pv_lock_ops.spin_is_contended, lock);
762 }
763 #define arch_spin_is_contended  arch_spin_is_contended
764
765 static __always_inline void arch_spin_lock(struct arch_spinlock *lock)
766 {
767         PVOP_VCALL1(pv_lock_ops.spin_lock, lock);
768 }
769
770 static __always_inline void arch_spin_lock_flags(struct arch_spinlock *lock,
771                                                   unsigned long flags)
772 {
773         PVOP_VCALL2(pv_lock_ops.spin_lock_flags, lock, flags);
774 }
775
776 static __always_inline int arch_spin_trylock(struct arch_spinlock *lock)
777 {
778         return PVOP_CALL1(int, pv_lock_ops.spin_trylock, lock);
779 }
780
781 static __always_inline void arch_spin_unlock(struct arch_spinlock *lock)
782 {
783         PVOP_VCALL1(pv_lock_ops.spin_unlock, lock);
784 }
785
786 #endif
787
788 #ifdef CONFIG_X86_32
789 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
790 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
791
792 /* save and restore all caller-save registers, except return value */
793 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
794 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
795
796 #define PV_FLAGS_ARG "0"
797 #define PV_EXTRA_CLOBBERS
798 #define PV_VEXTRA_CLOBBERS
799 #else
800 /* save and restore all caller-save registers, except return value */
801 #define PV_SAVE_ALL_CALLER_REGS                                         \
802         "push %rcx;"                                                    \
803         "push %rdx;"                                                    \
804         "push %rsi;"                                                    \
805         "push %rdi;"                                                    \
806         "push %r8;"                                                     \
807         "push %r9;"                                                     \
808         "push %r10;"                                                    \
809         "push %r11;"
810 #define PV_RESTORE_ALL_CALLER_REGS                                      \
811         "pop %r11;"                                                     \
812         "pop %r10;"                                                     \
813         "pop %r9;"                                                      \
814         "pop %r8;"                                                      \
815         "pop %rdi;"                                                     \
816         "pop %rsi;"                                                     \
817         "pop %rdx;"                                                     \
818         "pop %rcx;"
819
820 /* We save some registers, but all of them, that's too much. We clobber all
821  * caller saved registers but the argument parameter */
822 #define PV_SAVE_REGS "pushq %%rdi;"
823 #define PV_RESTORE_REGS "popq %%rdi;"
824 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
825 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
826 #define PV_FLAGS_ARG "D"
827 #endif
828
829 /*
830  * Generate a thunk around a function which saves all caller-save
831  * registers except for the return value.  This allows C functions to
832  * be called from assembler code where fewer than normal registers are
833  * available.  It may also help code generation around calls from C
834  * code if the common case doesn't use many registers.
835  *
836  * When a callee is wrapped in a thunk, the caller can assume that all
837  * arg regs and all scratch registers are preserved across the
838  * call. The return value in rax/eax will not be saved, even for void
839  * functions.
840  */
841 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
842         extern typeof(func) __raw_callee_save_##func;                   \
843         static void *__##func##__ __used = func;                        \
844                                                                         \
845         asm(".pushsection .text;"                                       \
846             "__raw_callee_save_" #func ": "                             \
847             PV_SAVE_ALL_CALLER_REGS                                     \
848             "call " #func ";"                                           \
849             PV_RESTORE_ALL_CALLER_REGS                                  \
850             "ret;"                                                      \
851             ".popsection")
852
853 /* Get a reference to a callee-save function */
854 #define PV_CALLEE_SAVE(func)                                            \
855         ((struct paravirt_callee_save) { __raw_callee_save_##func })
856
857 /* Promise that "func" already uses the right calling convention */
858 #define __PV_IS_CALLEE_SAVE(func)                       \
859         ((struct paravirt_callee_save) { func })
860
861 static inline notrace unsigned long arch_local_save_flags(void)
862 {
863         return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
864 }
865
866 static inline notrace void arch_local_irq_restore(unsigned long f)
867 {
868         PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
869 }
870
871 static inline notrace void arch_local_irq_disable(void)
872 {
873         PVOP_VCALLEE0(pv_irq_ops.irq_disable);
874 }
875
876 static inline notrace void arch_local_irq_enable(void)
877 {
878         PVOP_VCALLEE0(pv_irq_ops.irq_enable);
879 }
880
881 static inline notrace unsigned long arch_local_irq_save(void)
882 {
883         unsigned long f;
884
885         f = arch_local_save_flags();
886         arch_local_irq_disable();
887         return f;
888 }
889
890
891 /* Make sure as little as possible of this mess escapes. */
892 #undef PARAVIRT_CALL
893 #undef __PVOP_CALL
894 #undef __PVOP_VCALL
895 #undef PVOP_VCALL0
896 #undef PVOP_CALL0
897 #undef PVOP_VCALL1
898 #undef PVOP_CALL1
899 #undef PVOP_VCALL2
900 #undef PVOP_CALL2
901 #undef PVOP_VCALL3
902 #undef PVOP_CALL3
903 #undef PVOP_VCALL4
904 #undef PVOP_CALL4
905
906 extern void default_banner(void);
907
908 #else  /* __ASSEMBLY__ */
909
910 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
911 771:;                                           \
912         ops;                                    \
913 772:;                                           \
914         .pushsection .parainstructions,"a";     \
915          .align algn;                           \
916          word 771b;                             \
917          .byte ptype;                           \
918          .byte 772b-771b;                       \
919          .short clobbers;                       \
920         .popsection
921
922
923 #define COND_PUSH(set, mask, reg)                       \
924         .if ((~(set)) & mask); push %reg; .endif
925 #define COND_POP(set, mask, reg)                        \
926         .if ((~(set)) & mask); pop %reg; .endif
927
928 #ifdef CONFIG_X86_64
929
930 #define PV_SAVE_REGS(set)                       \
931         COND_PUSH(set, CLBR_RAX, rax);          \
932         COND_PUSH(set, CLBR_RCX, rcx);          \
933         COND_PUSH(set, CLBR_RDX, rdx);          \
934         COND_PUSH(set, CLBR_RSI, rsi);          \
935         COND_PUSH(set, CLBR_RDI, rdi);          \
936         COND_PUSH(set, CLBR_R8, r8);            \
937         COND_PUSH(set, CLBR_R9, r9);            \
938         COND_PUSH(set, CLBR_R10, r10);          \
939         COND_PUSH(set, CLBR_R11, r11)
940 #define PV_RESTORE_REGS(set)                    \
941         COND_POP(set, CLBR_R11, r11);           \
942         COND_POP(set, CLBR_R10, r10);           \
943         COND_POP(set, CLBR_R9, r9);             \
944         COND_POP(set, CLBR_R8, r8);             \
945         COND_POP(set, CLBR_RDI, rdi);           \
946         COND_POP(set, CLBR_RSI, rsi);           \
947         COND_POP(set, CLBR_RDX, rdx);           \
948         COND_POP(set, CLBR_RCX, rcx);           \
949         COND_POP(set, CLBR_RAX, rax)
950
951 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
952 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
953 #define PARA_INDIRECT(addr)     *addr(%rip)
954 #else
955 #define PV_SAVE_REGS(set)                       \
956         COND_PUSH(set, CLBR_EAX, eax);          \
957         COND_PUSH(set, CLBR_EDI, edi);          \
958         COND_PUSH(set, CLBR_ECX, ecx);          \
959         COND_PUSH(set, CLBR_EDX, edx)
960 #define PV_RESTORE_REGS(set)                    \
961         COND_POP(set, CLBR_EDX, edx);           \
962         COND_POP(set, CLBR_ECX, ecx);           \
963         COND_POP(set, CLBR_EDI, edi);           \
964         COND_POP(set, CLBR_EAX, eax)
965
966 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
967 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
968 #define PARA_INDIRECT(addr)     *%cs:addr
969 #endif
970
971 #define INTERRUPT_RETURN                                                \
972         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
973                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
974
975 #define DISABLE_INTERRUPTS(clobbers)                                    \
976         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
977                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
978                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
979                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
980
981 #define ENABLE_INTERRUPTS(clobbers)                                     \
982         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
983                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
984                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
985                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
986
987 #define USERGS_SYSRET32                                                 \
988         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret32),       \
989                   CLBR_NONE,                                            \
990                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret32))
991
992 #ifdef CONFIG_X86_32
993 #define GET_CR0_INTO_EAX                                \
994         push %ecx; push %edx;                           \
995         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
996         pop %edx; pop %ecx
997
998 #define ENABLE_INTERRUPTS_SYSEXIT                                       \
999         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
1000                   CLBR_NONE,                                            \
1001                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
1002
1003
1004 #else   /* !CONFIG_X86_32 */
1005
1006 /*
1007  * If swapgs is used while the userspace stack is still current,
1008  * there's no way to call a pvop.  The PV replacement *must* be
1009  * inlined, or the swapgs instruction must be trapped and emulated.
1010  */
1011 #define SWAPGS_UNSAFE_STACK                                             \
1012         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
1013                   swapgs)
1014
1015 /*
1016  * Note: swapgs is very special, and in practise is either going to be
1017  * implemented with a single "swapgs" instruction or something very
1018  * special.  Either way, we don't need to save any registers for
1019  * it.
1020  */
1021 #define SWAPGS                                                          \
1022         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
1023                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
1024                  )
1025
1026 #define GET_CR2_INTO_RCX                                \
1027         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2); \
1028         movq %rax, %rcx;                                \
1029         xorq %rax, %rax;
1030
1031 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
1032         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
1033                   CLBR_NONE,                                            \
1034                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
1035
1036 #define USERGS_SYSRET64                                                 \
1037         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
1038                   CLBR_NONE,                                            \
1039                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
1040
1041 #define ENABLE_INTERRUPTS_SYSEXIT32                                     \
1042         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
1043                   CLBR_NONE,                                            \
1044                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
1045 #endif  /* CONFIG_X86_32 */
1046
1047 #endif /* __ASSEMBLY__ */
1048 #else  /* CONFIG_PARAVIRT */
1049 # define default_banner x86_init_noop
1050 #endif /* !CONFIG_PARAVIRT */
1051 #endif /* _ASM_X86_PARAVIRT_H */