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