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TOMOYO Linux Cross Reference
Linux/arch/x86/include/asm/paravirt.h

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  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_write_msr(unsigned msr, unsigned low, unsigned high)
132 {
133         return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
134 }
135 
136 /* These should all do BUG_ON(_err), but our headers are too tangled. */
137 #define rdmsr(msr, val1, val2)                  \
138 do {                                            \
139         int _err;                               \
140         u64 _l = paravirt_read_msr(msr, &_err); \
141         val1 = (u32)_l;                         \
142         val2 = _l >> 32;                        \
143 } while (0)
144 
145 #define wrmsr(msr, val1, val2)                  \
146 do {                                            \
147         paravirt_write_msr(msr, val1, val2);    \
148 } while (0)
149 
150 #define rdmsrl(msr, val)                        \
151 do {                                            \
152         int _err;                               \
153         val = paravirt_read_msr(msr, &_err);    \
154 } while (0)
155 
156 #define wrmsrl(msr, val)        wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
157 #define wrmsr_safe(msr, a, b)   paravirt_write_msr(msr, a, b)
158 
159 /* rdmsr with exception handling */
160 #define rdmsr_safe(msr, a, b)                   \
161 ({                                              \
162         int _err;                               \
163         u64 _l = paravirt_read_msr(msr, &_err); \
164         (*a) = (u32)_l;                         \
165         (*b) = _l >> 32;                        \
166         _err;                                   \
167 })
168 
169 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
170 {
171         int err;
172 
173         *p = paravirt_read_msr(msr, &err);
174         return err;
175 }
176 
177 static inline u64 paravirt_read_tsc(void)
178 {
179         return PVOP_CALL0(u64, pv_cpu_ops.read_tsc);
180 }
181 
182 #define rdtscl(low)                             \
183 do {                                            \
184         u64 _l = paravirt_read_tsc();           \
185         low = (int)_l;                          \
186 } while (0)
187 
188 #define rdtscll(val) (val = paravirt_read_tsc())
189 
190 static inline unsigned long long paravirt_sched_clock(void)
191 {
192         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
193 }
194 
195 struct static_key;
196 extern struct static_key paravirt_steal_enabled;
197 extern struct static_key paravirt_steal_rq_enabled;
198 
199 static inline u64 paravirt_steal_clock(int cpu)
200 {
201         return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
202 }
203 
204 static inline unsigned long long paravirt_read_pmc(int counter)
205 {
206         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
207 }
208 
209 #define rdpmc(counter, low, high)               \
210 do {                                            \
211         u64 _l = paravirt_read_pmc(counter);    \
212         low = (u32)_l;                          \
213         high = _l >> 32;                        \
214 } while (0)
215 
216 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))
217 
218 static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
219 {
220         return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
221 }
222 
223 #define rdtscp(low, high, aux)                          \
224 do {                                                    \
225         int __aux;                                      \
226         unsigned long __val = paravirt_rdtscp(&__aux);  \
227         (low) = (u32)__val;                             \
228         (high) = (u32)(__val >> 32);                    \
229         (aux) = __aux;                                  \
230 } while (0)
231 
232 #define rdtscpll(val, aux)                              \
233 do {                                                    \
234         unsigned long __aux;                            \
235         val = paravirt_rdtscp(&__aux);                  \
236         (aux) = __aux;                                  \
237 } while (0)
238 
239 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
240 {
241         PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
242 }
243 
244 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
245 {
246         PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
247 }
248 
249 static inline void load_TR_desc(void)
250 {
251         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
252 }
253 static inline void load_gdt(const struct desc_ptr *dtr)
254 {
255         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
256 }
257 static inline void load_idt(const struct desc_ptr *dtr)
258 {
259         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
260 }
261 static inline void set_ldt(const void *addr, unsigned entries)
262 {
263         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
264 }
265 static inline void store_idt(struct desc_ptr *dtr)
266 {
267         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
268 }
269 static inline unsigned long paravirt_store_tr(void)
270 {
271         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
272 }
273 #define store_tr(tr)    ((tr) = paravirt_store_tr())
274 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
275 {
276         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
277 }
278 
279 #ifdef CONFIG_X86_64
280 static inline void load_gs_index(unsigned int gs)
281 {
282         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
283 }
284 #endif
285 
286 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
287                                    const void *desc)
288 {
289         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
290 }
291 
292 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
293                                    void *desc, int type)
294 {
295         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
296 }
297 
298 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
299 {
300         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
301 }
302 static inline void set_iopl_mask(unsigned mask)
303 {
304         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
305 }
306 
307 /* The paravirtualized I/O functions */
308 static inline void slow_down_io(void)
309 {
310         pv_cpu_ops.io_delay();
311 #ifdef REALLY_SLOW_IO
312         pv_cpu_ops.io_delay();
313         pv_cpu_ops.io_delay();
314         pv_cpu_ops.io_delay();
315 #endif
316 }
317 
318 #ifdef CONFIG_SMP
319 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
320                                     unsigned long start_esp)
321 {
322         PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
323                     phys_apicid, start_eip, start_esp);
324 }
325 #endif
326 
327 static inline void paravirt_activate_mm(struct mm_struct *prev,
328                                         struct mm_struct *next)
329 {
330         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
331 }
332 
333 static inline void arch_dup_mmap(struct mm_struct *oldmm,
334                                  struct mm_struct *mm)
335 {
336         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
337 }
338 
339 static inline void arch_exit_mmap(struct mm_struct *mm)
340 {
341         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
342 }
343 
344 static inline void __flush_tlb(void)
345 {
346         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
347 }
348 static inline void __flush_tlb_global(void)
349 {
350         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
351 }
352 static inline void __flush_tlb_single(unsigned long addr)
353 {
354         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
355 }
356 
357 static inline void flush_tlb_others(const struct cpumask *cpumask,
358                                     struct mm_struct *mm,
359                                     unsigned long start,
360                                     unsigned long end)
361 {
362         PVOP_VCALL4(pv_mmu_ops.flush_tlb_others, cpumask, mm, start, end);
363 }
364 
365 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
366 {
367         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
368 }
369 
370 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
371 {
372         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
373 }
374 
375 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
376 {
377         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
378 }
379 static inline void paravirt_release_pte(unsigned long pfn)
380 {
381         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
382 }
383 
384 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
385 {
386         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
387 }
388 
389 static inline void paravirt_release_pmd(unsigned long pfn)
390 {
391         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
392 }
393 
394 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
395 {
396         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
397 }
398 static inline void paravirt_release_pud(unsigned long pfn)
399 {
400         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
401 }
402 
403 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
404                               pte_t *ptep)
405 {
406         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
407 }
408 static inline void pmd_update(struct mm_struct *mm, unsigned long addr,
409                               pmd_t *pmdp)
410 {
411         PVOP_VCALL3(pv_mmu_ops.pmd_update, mm, addr, pmdp);
412 }
413 
414 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
415                                     pte_t *ptep)
416 {
417         PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
418 }
419 
420 static inline void pmd_update_defer(struct mm_struct *mm, unsigned long addr,
421                                     pmd_t *pmdp)
422 {
423         PVOP_VCALL3(pv_mmu_ops.pmd_update_defer, mm, addr, pmdp);
424 }
425 
426 static inline pte_t __pte(pteval_t val)
427 {
428         pteval_t ret;
429 
430         if (sizeof(pteval_t) > sizeof(long))
431                 ret = PVOP_CALLEE2(pteval_t,
432                                    pv_mmu_ops.make_pte,
433                                    val, (u64)val >> 32);
434         else
435                 ret = PVOP_CALLEE1(pteval_t,
436                                    pv_mmu_ops.make_pte,
437                                    val);
438 
439         return (pte_t) { .pte = ret };
440 }
441 
442 static inline pteval_t pte_val(pte_t pte)
443 {
444         pteval_t ret;
445 
446         if (sizeof(pteval_t) > sizeof(long))
447                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
448                                    pte.pte, (u64)pte.pte >> 32);
449         else
450                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
451                                    pte.pte);
452 
453         return ret;
454 }
455 
456 static inline pgd_t __pgd(pgdval_t val)
457 {
458         pgdval_t ret;
459 
460         if (sizeof(pgdval_t) > sizeof(long))
461                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
462                                    val, (u64)val >> 32);
463         else
464                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
465                                    val);
466 
467         return (pgd_t) { ret };
468 }
469 
470 static inline pgdval_t pgd_val(pgd_t pgd)
471 {
472         pgdval_t ret;
473 
474         if (sizeof(pgdval_t) > sizeof(long))
475                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
476                                     pgd.pgd, (u64)pgd.pgd >> 32);
477         else
478                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
479                                     pgd.pgd);
480 
481         return ret;
482 }
483 
484 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
485 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
486                                            pte_t *ptep)
487 {
488         pteval_t ret;
489 
490         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
491                          mm, addr, ptep);
492 
493         return (pte_t) { .pte = ret };
494 }
495 
496 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
497                                            pte_t *ptep, pte_t pte)
498 {
499         if (sizeof(pteval_t) > sizeof(long))
500                 /* 5 arg words */
501                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
502         else
503                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
504                             mm, addr, ptep, pte.pte);
505 }
506 
507 static inline void set_pte(pte_t *ptep, pte_t pte)
508 {
509         if (sizeof(pteval_t) > sizeof(long))
510                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
511                             pte.pte, (u64)pte.pte >> 32);
512         else
513                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
514                             pte.pte);
515 }
516 
517 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
518                               pte_t *ptep, pte_t pte)
519 {
520         if (sizeof(pteval_t) > sizeof(long))
521                 /* 5 arg words */
522                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
523         else
524                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
525 }
526 
527 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
528                               pmd_t *pmdp, pmd_t pmd)
529 {
530         if (sizeof(pmdval_t) > sizeof(long))
531                 /* 5 arg words */
532                 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
533         else
534                 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
535                             native_pmd_val(pmd));
536 }
537 
538 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
539 {
540         pmdval_t val = native_pmd_val(pmd);
541 
542         if (sizeof(pmdval_t) > sizeof(long))
543                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
544         else
545                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
546 }
547 
548 #if PAGETABLE_LEVELS >= 3
549 static inline pmd_t __pmd(pmdval_t val)
550 {
551         pmdval_t ret;
552 
553         if (sizeof(pmdval_t) > sizeof(long))
554                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
555                                    val, (u64)val >> 32);
556         else
557                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
558                                    val);
559 
560         return (pmd_t) { ret };
561 }
562 
563 static inline pmdval_t pmd_val(pmd_t pmd)
564 {
565         pmdval_t ret;
566 
567         if (sizeof(pmdval_t) > sizeof(long))
568                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
569                                     pmd.pmd, (u64)pmd.pmd >> 32);
570         else
571                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
572                                     pmd.pmd);
573 
574         return ret;
575 }
576 
577 static inline void set_pud(pud_t *pudp, pud_t pud)
578 {
579         pudval_t val = native_pud_val(pud);
580 
581         if (sizeof(pudval_t) > sizeof(long))
582                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
583                             val, (u64)val >> 32);
584         else
585                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
586                             val);
587 }
588 #if PAGETABLE_LEVELS == 4
589 static inline pud_t __pud(pudval_t val)
590 {
591         pudval_t ret;
592 
593         if (sizeof(pudval_t) > sizeof(long))
594                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
595                                    val, (u64)val >> 32);
596         else
597                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
598                                    val);
599 
600         return (pud_t) { ret };
601 }
602 
603 static inline pudval_t pud_val(pud_t pud)
604 {
605         pudval_t ret;
606 
607         if (sizeof(pudval_t) > sizeof(long))
608                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
609                                     pud.pud, (u64)pud.pud >> 32);
610         else
611                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
612                                     pud.pud);
613 
614         return ret;
615 }
616 
617 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
618 {
619         pgdval_t val = native_pgd_val(pgd);
620 
621         if (sizeof(pgdval_t) > sizeof(long))
622                 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
623                             val, (u64)val >> 32);
624         else
625                 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
626                             val);
627 }
628 
629 static inline void pgd_clear(pgd_t *pgdp)
630 {
631         set_pgd(pgdp, __pgd(0));
632 }
633 
634 static inline void pud_clear(pud_t *pudp)
635 {
636         set_pud(pudp, __pud(0));
637 }
638 
639 #endif  /* PAGETABLE_LEVELS == 4 */
640 
641 #endif  /* PAGETABLE_LEVELS >= 3 */
642 
643 #ifdef CONFIG_X86_PAE
644 /* Special-case pte-setting operations for PAE, which can't update a
645    64-bit pte atomically */
646 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
647 {
648         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
649                     pte.pte, pte.pte >> 32);
650 }
651 
652 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
653                              pte_t *ptep)
654 {
655         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
656 }
657 
658 static inline void pmd_clear(pmd_t *pmdp)
659 {
660         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
661 }
662 #else  /* !CONFIG_X86_PAE */
663 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
664 {
665         set_pte(ptep, pte);
666 }
667 
668 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
669                              pte_t *ptep)
670 {
671         set_pte_at(mm, addr, ptep, __pte(0));
672 }
673 
674 static inline void pmd_clear(pmd_t *pmdp)
675 {
676         set_pmd(pmdp, __pmd(0));
677 }
678 #endif  /* CONFIG_X86_PAE */
679 
680 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
681 static inline void arch_start_context_switch(struct task_struct *prev)
682 {
683         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
684 }
685 
686 static inline void arch_end_context_switch(struct task_struct *next)
687 {
688         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
689 }
690 
691 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
692 static inline void arch_enter_lazy_mmu_mode(void)
693 {
694         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
695 }
696 
697 static inline void arch_leave_lazy_mmu_mode(void)
698 {
699         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
700 }
701 
702 static inline void arch_flush_lazy_mmu_mode(void)
703 {
704         PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush);
705 }
706 
707 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
708                                 phys_addr_t phys, pgprot_t flags)
709 {
710         pv_mmu_ops.set_fixmap(idx, phys, flags);
711 }
712 
713 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
714 
715 static __always_inline void __ticket_lock_spinning(struct arch_spinlock *lock,
716                                                         __ticket_t ticket)
717 {
718         PVOP_VCALLEE2(pv_lock_ops.lock_spinning, lock, ticket);
719 }
720 
721 static __always_inline void __ticket_unlock_kick(struct arch_spinlock *lock,
722                                                         __ticket_t ticket)
723 {
724         PVOP_VCALL2(pv_lock_ops.unlock_kick, lock, ticket);
725 }
726 
727 #endif
728 
729 #ifdef CONFIG_X86_32
730 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
731 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
732 
733 /* save and restore all caller-save registers, except return value */
734 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
735 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
736 
737 #define PV_FLAGS_ARG ""
738 #define PV_EXTRA_CLOBBERS
739 #define PV_VEXTRA_CLOBBERS
740 #else
741 /* save and restore all caller-save registers, except return value */
742 #define PV_SAVE_ALL_CALLER_REGS                                         \
743         "push %rcx;"                                                    \
744         "push %rdx;"                                                    \
745         "push %rsi;"                                                    \
746         "push %rdi;"                                                    \
747         "push %r8;"                                                     \
748         "push %r9;"                                                     \
749         "push %r10;"                                                    \
750         "push %r11;"
751 #define PV_RESTORE_ALL_CALLER_REGS                                      \
752         "pop %r11;"                                                     \
753         "pop %r10;"                                                     \
754         "pop %r9;"                                                      \
755         "pop %r8;"                                                      \
756         "pop %rdi;"                                                     \
757         "pop %rsi;"                                                     \
758         "pop %rdx;"                                                     \
759         "pop %rcx;"
760 
761 /* We save some registers, but all of them, that's too much. We clobber all
762  * caller saved registers but the argument parameter */
763 #define PV_SAVE_REGS "pushq %%rdi;"
764 #define PV_RESTORE_REGS "popq %%rdi;"
765 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
766 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
767 #define PV_FLAGS_ARG "D"
768 #endif
769 
770 /*
771  * Generate a thunk around a function which saves all caller-save
772  * registers except for the return value.  This allows C functions to
773  * be called from assembler code where fewer than normal registers are
774  * available.  It may also help code generation around calls from C
775  * code if the common case doesn't use many registers.
776  *
777  * When a callee is wrapped in a thunk, the caller can assume that all
778  * arg regs and all scratch registers are preserved across the
779  * call. The return value in rax/eax will not be saved, even for void
780  * functions.
781  */
782 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
783         extern typeof(func) __raw_callee_save_##func;                   \
784                                                                         \
785         asm(".pushsection .text;"                                       \
786             ".globl __raw_callee_save_" #func " ; "                     \
787             "__raw_callee_save_" #func ": "                             \
788             PV_SAVE_ALL_CALLER_REGS                                     \
789             "call " #func ";"                                           \
790             PV_RESTORE_ALL_CALLER_REGS                                  \
791             "ret;"                                                      \
792             ".popsection")
793 
794 /* Get a reference to a callee-save function */
795 #define PV_CALLEE_SAVE(func)                                            \
796         ((struct paravirt_callee_save) { __raw_callee_save_##func })
797 
798 /* Promise that "func" already uses the right calling convention */
799 #define __PV_IS_CALLEE_SAVE(func)                       \
800         ((struct paravirt_callee_save) { func })
801 
802 static inline notrace unsigned long arch_local_save_flags(void)
803 {
804         return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
805 }
806 
807 static inline notrace void arch_local_irq_restore(unsigned long f)
808 {
809         PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
810 }
811 
812 static inline notrace void arch_local_irq_disable(void)
813 {
814         PVOP_VCALLEE0(pv_irq_ops.irq_disable);
815 }
816 
817 static inline notrace void arch_local_irq_enable(void)
818 {
819         PVOP_VCALLEE0(pv_irq_ops.irq_enable);
820 }
821 
822 static inline notrace unsigned long arch_local_irq_save(void)
823 {
824         unsigned long f;
825 
826         f = arch_local_save_flags();
827         arch_local_irq_disable();
828         return f;
829 }
830 
831 
832 /* Make sure as little as possible of this mess escapes. */
833 #undef PARAVIRT_CALL
834 #undef __PVOP_CALL
835 #undef __PVOP_VCALL
836 #undef PVOP_VCALL0
837 #undef PVOP_CALL0
838 #undef PVOP_VCALL1
839 #undef PVOP_CALL1
840 #undef PVOP_VCALL2
841 #undef PVOP_CALL2
842 #undef PVOP_VCALL3
843 #undef PVOP_CALL3
844 #undef PVOP_VCALL4
845 #undef PVOP_CALL4
846 
847 extern void default_banner(void);
848 
849 #else  /* __ASSEMBLY__ */
850 
851 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
852 771:;                                           \
853         ops;                                    \
854 772:;                                           \
855         .pushsection .parainstructions,"a";     \
856          .align algn;                           \
857          word 771b;                             \
858          .byte ptype;                           \
859          .byte 772b-771b;                       \
860          .short clobbers;                       \
861         .popsection
862 
863 
864 #define COND_PUSH(set, mask, reg)                       \
865         .if ((~(set)) & mask); push %reg; .endif
866 #define COND_POP(set, mask, reg)                        \
867         .if ((~(set)) & mask); pop %reg; .endif
868 
869 #ifdef CONFIG_X86_64
870 
871 #define PV_SAVE_REGS(set)                       \
872         COND_PUSH(set, CLBR_RAX, rax);          \
873         COND_PUSH(set, CLBR_RCX, rcx);          \
874         COND_PUSH(set, CLBR_RDX, rdx);          \
875         COND_PUSH(set, CLBR_RSI, rsi);          \
876         COND_PUSH(set, CLBR_RDI, rdi);          \
877         COND_PUSH(set, CLBR_R8, r8);            \
878         COND_PUSH(set, CLBR_R9, r9);            \
879         COND_PUSH(set, CLBR_R10, r10);          \
880         COND_PUSH(set, CLBR_R11, r11)
881 #define PV_RESTORE_REGS(set)                    \
882         COND_POP(set, CLBR_R11, r11);           \
883         COND_POP(set, CLBR_R10, r10);           \
884         COND_POP(set, CLBR_R9, r9);             \
885         COND_POP(set, CLBR_R8, r8);             \
886         COND_POP(set, CLBR_RDI, rdi);           \
887         COND_POP(set, CLBR_RSI, rsi);           \
888         COND_POP(set, CLBR_RDX, rdx);           \
889         COND_POP(set, CLBR_RCX, rcx);           \
890         COND_POP(set, CLBR_RAX, rax)
891 
892 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
893 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
894 #define PARA_INDIRECT(addr)     *addr(%rip)
895 #else
896 #define PV_SAVE_REGS(set)                       \
897         COND_PUSH(set, CLBR_EAX, eax);          \
898         COND_PUSH(set, CLBR_EDI, edi);          \
899         COND_PUSH(set, CLBR_ECX, ecx);          \
900         COND_PUSH(set, CLBR_EDX, edx)
901 #define PV_RESTORE_REGS(set)                    \
902         COND_POP(set, CLBR_EDX, edx);           \
903         COND_POP(set, CLBR_ECX, ecx);           \
904         COND_POP(set, CLBR_EDI, edi);           \
905         COND_POP(set, CLBR_EAX, eax)
906 
907 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
908 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
909 #define PARA_INDIRECT(addr)     *%cs:addr
910 #endif
911 
912 #define INTERRUPT_RETURN                                                \
913         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
914                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
915 
916 #define DISABLE_INTERRUPTS(clobbers)                                    \
917         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
918                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
919                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
920                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
921 
922 #define ENABLE_INTERRUPTS(clobbers)                                     \
923         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
924                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
925                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
926                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
927 
928 #define USERGS_SYSRET32                                                 \
929         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret32),       \
930                   CLBR_NONE,                                            \
931                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret32))
932 
933 #ifdef CONFIG_X86_32
934 #define GET_CR0_INTO_EAX                                \
935         push %ecx; push %edx;                           \
936         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
937         pop %edx; pop %ecx
938 
939 #define ENABLE_INTERRUPTS_SYSEXIT                                       \
940         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
941                   CLBR_NONE,                                            \
942                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
943 
944 
945 #else   /* !CONFIG_X86_32 */
946 
947 /*
948  * If swapgs is used while the userspace stack is still current,
949  * there's no way to call a pvop.  The PV replacement *must* be
950  * inlined, or the swapgs instruction must be trapped and emulated.
951  */
952 #define SWAPGS_UNSAFE_STACK                                             \
953         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
954                   swapgs)
955 
956 /*
957  * Note: swapgs is very special, and in practise is either going to be
958  * implemented with a single "swapgs" instruction or something very
959  * special.  Either way, we don't need to save any registers for
960  * it.
961  */
962 #define SWAPGS                                                          \
963         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
964                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
965                  )
966 
967 #define GET_CR2_INTO_RAX                                \
968         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
969 
970 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
971         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
972                   CLBR_NONE,                                            \
973                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
974 
975 #define USERGS_SYSRET64                                                 \
976         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
977                   CLBR_NONE,                                            \
978                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
979 
980 #define ENABLE_INTERRUPTS_SYSEXIT32                                     \
981         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),    \
982                   CLBR_NONE,                                            \
983                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
984 #endif  /* CONFIG_X86_32 */
985 
986 #endif /* __ASSEMBLY__ */
987 #else  /* CONFIG_PARAVIRT */
988 # define default_banner x86_init_noop
989 #endif /* !CONFIG_PARAVIRT */
990 #endif /* _ASM_X86_PARAVIRT_H */
991 

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