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. */
7 #include <asm/pgtable_types.h>
10 #include <asm/paravirt_types.h>
13 #include <linux/bug.h>
14 #include <linux/types.h>
15 #include <linux/cpumask.h>
17 static inline int paravirt_enabled(void)
19 return pv_info.paravirt_enabled;
22 static inline void load_sp0(struct tss_struct *tss,
23 struct thread_struct *thread)
25 PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
28 /* The paravirtualized CPUID instruction. */
29 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
30 unsigned int *ecx, unsigned int *edx)
32 PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
36 * These special macros can be used to get or set a debugging register
38 static inline unsigned long paravirt_get_debugreg(int reg)
40 return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
42 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
43 static inline void set_debugreg(unsigned long val, int reg)
45 PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
48 static inline void clts(void)
50 PVOP_VCALL0(pv_cpu_ops.clts);
53 static inline unsigned long read_cr0(void)
55 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
58 static inline void write_cr0(unsigned long x)
60 PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
63 static inline unsigned long read_cr2(void)
65 return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
68 static inline void write_cr2(unsigned long x)
70 PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
73 static inline unsigned long read_cr3(void)
75 return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
78 static inline void write_cr3(unsigned long x)
80 PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
83 static inline unsigned long __read_cr4(void)
85 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
87 static inline unsigned long __read_cr4_safe(void)
89 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
92 static inline void __write_cr4(unsigned long x)
94 PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
98 static inline unsigned long read_cr8(void)
100 return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
103 static inline void write_cr8(unsigned long x)
105 PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
109 static inline void arch_safe_halt(void)
111 PVOP_VCALL0(pv_irq_ops.safe_halt);
114 static inline void halt(void)
116 PVOP_VCALL0(pv_irq_ops.halt);
119 static inline void wbinvd(void)
121 PVOP_VCALL0(pv_cpu_ops.wbinvd);
124 #define get_kernel_rpl() (pv_info.kernel_rpl)
126 static inline u64 paravirt_read_msr(unsigned msr, int *err)
128 return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
131 static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
133 return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
136 /* These should all do BUG_ON(_err), but our headers are too tangled. */
137 #define rdmsr(msr, val1, val2) \
140 u64 _l = paravirt_read_msr(msr, &_err); \
145 #define wrmsr(msr, val1, val2) \
147 paravirt_write_msr(msr, val1, val2); \
150 #define rdmsrl(msr, val) \
153 val = paravirt_read_msr(msr, &_err); \
156 static inline void wrmsrl(unsigned msr, u64 val)
158 wrmsr(msr, (u32)val, (u32)(val>>32));
161 #define wrmsr_safe(msr, a, b) paravirt_write_msr(msr, a, b)
163 /* rdmsr with exception handling */
164 #define rdmsr_safe(msr, a, b) \
167 u64 _l = paravirt_read_msr(msr, &_err); \
173 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
177 *p = paravirt_read_msr(msr, &err);
181 static inline unsigned long long paravirt_sched_clock(void)
183 return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
187 extern struct static_key paravirt_steal_enabled;
188 extern struct static_key paravirt_steal_rq_enabled;
190 static inline u64 paravirt_steal_clock(int cpu)
192 return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
195 static inline unsigned long long paravirt_read_pmc(int counter)
197 return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
200 #define rdpmc(counter, low, high) \
202 u64 _l = paravirt_read_pmc(counter); \
207 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))
209 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
211 PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
214 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
216 PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
219 static inline void load_TR_desc(void)
221 PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
223 static inline void load_gdt(const struct desc_ptr *dtr)
225 PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
227 static inline void load_idt(const struct desc_ptr *dtr)
229 PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
231 static inline void set_ldt(const void *addr, unsigned entries)
233 PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
235 static inline void store_idt(struct desc_ptr *dtr)
237 PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
239 static inline unsigned long paravirt_store_tr(void)
241 return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
243 #define store_tr(tr) ((tr) = paravirt_store_tr())
244 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
246 PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
250 static inline void load_gs_index(unsigned int gs)
252 PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
256 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
259 PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
262 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
263 void *desc, int type)
265 PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
268 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
270 PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
272 static inline void set_iopl_mask(unsigned mask)
274 PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
277 /* The paravirtualized I/O functions */
278 static inline void slow_down_io(void)
280 pv_cpu_ops.io_delay();
281 #ifdef REALLY_SLOW_IO
282 pv_cpu_ops.io_delay();
283 pv_cpu_ops.io_delay();
284 pv_cpu_ops.io_delay();
289 static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
290 unsigned long start_esp)
292 PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
293 phys_apicid, start_eip, start_esp);
297 static inline void paravirt_activate_mm(struct mm_struct *prev,
298 struct mm_struct *next)
300 PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
303 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
304 struct mm_struct *mm)
306 PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
309 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
311 PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
314 static inline void __flush_tlb(void)
316 PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
318 static inline void __flush_tlb_global(void)
320 PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
322 static inline void __flush_tlb_single(unsigned long addr)
324 PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
327 static inline void flush_tlb_others(const struct cpumask *cpumask,
328 struct mm_struct *mm,
332 PVOP_VCALL4(pv_mmu_ops.flush_tlb_others, cpumask, mm, start, end);
335 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
337 return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
340 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
342 PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
345 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
347 PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
349 static inline void paravirt_release_pte(unsigned long pfn)
351 PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
354 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
356 PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
359 static inline void paravirt_release_pmd(unsigned long pfn)
361 PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
364 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
366 PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
368 static inline void paravirt_release_pud(unsigned long pfn)
370 PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
373 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
376 PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
378 static inline void pmd_update(struct mm_struct *mm, unsigned long addr,
381 PVOP_VCALL3(pv_mmu_ops.pmd_update, mm, addr, pmdp);
384 static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
387 PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
390 static inline void pmd_update_defer(struct mm_struct *mm, unsigned long addr,
393 PVOP_VCALL3(pv_mmu_ops.pmd_update_defer, mm, addr, pmdp);
396 static inline pte_t __pte(pteval_t val)
400 if (sizeof(pteval_t) > sizeof(long))
401 ret = PVOP_CALLEE2(pteval_t,
403 val, (u64)val >> 32);
405 ret = PVOP_CALLEE1(pteval_t,
409 return (pte_t) { .pte = ret };
412 static inline pteval_t pte_val(pte_t pte)
416 if (sizeof(pteval_t) > sizeof(long))
417 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
418 pte.pte, (u64)pte.pte >> 32);
420 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
426 static inline pgd_t __pgd(pgdval_t val)
430 if (sizeof(pgdval_t) > sizeof(long))
431 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
432 val, (u64)val >> 32);
434 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
437 return (pgd_t) { ret };
440 static inline pgdval_t pgd_val(pgd_t pgd)
444 if (sizeof(pgdval_t) > sizeof(long))
445 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
446 pgd.pgd, (u64)pgd.pgd >> 32);
448 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
454 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
455 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
460 ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
463 return (pte_t) { .pte = ret };
466 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
467 pte_t *ptep, pte_t pte)
469 if (sizeof(pteval_t) > sizeof(long))
471 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
473 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
474 mm, addr, ptep, pte.pte);
477 static inline void set_pte(pte_t *ptep, pte_t pte)
479 if (sizeof(pteval_t) > sizeof(long))
480 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
481 pte.pte, (u64)pte.pte >> 32);
483 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
487 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
488 pte_t *ptep, pte_t pte)
490 if (sizeof(pteval_t) > sizeof(long))
492 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
494 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
497 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
498 pmd_t *pmdp, pmd_t pmd)
500 if (sizeof(pmdval_t) > sizeof(long))
502 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
504 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
505 native_pmd_val(pmd));
508 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
510 pmdval_t val = native_pmd_val(pmd);
512 if (sizeof(pmdval_t) > sizeof(long))
513 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
515 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
518 #if CONFIG_PGTABLE_LEVELS >= 3
519 static inline pmd_t __pmd(pmdval_t val)
523 if (sizeof(pmdval_t) > sizeof(long))
524 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
525 val, (u64)val >> 32);
527 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
530 return (pmd_t) { ret };
533 static inline pmdval_t pmd_val(pmd_t pmd)
537 if (sizeof(pmdval_t) > sizeof(long))
538 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
539 pmd.pmd, (u64)pmd.pmd >> 32);
541 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
547 static inline void set_pud(pud_t *pudp, pud_t pud)
549 pudval_t val = native_pud_val(pud);
551 if (sizeof(pudval_t) > sizeof(long))
552 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
553 val, (u64)val >> 32);
555 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
558 #if CONFIG_PGTABLE_LEVELS == 4
559 static inline pud_t __pud(pudval_t val)
563 if (sizeof(pudval_t) > sizeof(long))
564 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
565 val, (u64)val >> 32);
567 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
570 return (pud_t) { ret };
573 static inline pudval_t pud_val(pud_t pud)
577 if (sizeof(pudval_t) > sizeof(long))
578 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
579 pud.pud, (u64)pud.pud >> 32);
581 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
587 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
589 pgdval_t val = native_pgd_val(pgd);
591 if (sizeof(pgdval_t) > sizeof(long))
592 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
593 val, (u64)val >> 32);
595 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
599 static inline void pgd_clear(pgd_t *pgdp)
601 set_pgd(pgdp, __pgd(0));
604 static inline void pud_clear(pud_t *pudp)
606 set_pud(pudp, __pud(0));
609 #endif /* CONFIG_PGTABLE_LEVELS == 4 */
611 #endif /* CONFIG_PGTABLE_LEVELS >= 3 */
613 #ifdef CONFIG_X86_PAE
614 /* Special-case pte-setting operations for PAE, which can't update a
615 64-bit pte atomically */
616 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
618 PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
619 pte.pte, pte.pte >> 32);
622 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
625 PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
628 static inline void pmd_clear(pmd_t *pmdp)
630 PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
632 #else /* !CONFIG_X86_PAE */
633 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
638 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
641 set_pte_at(mm, addr, ptep, __pte(0));
644 static inline void pmd_clear(pmd_t *pmdp)
646 set_pmd(pmdp, __pmd(0));
648 #endif /* CONFIG_X86_PAE */
650 #define __HAVE_ARCH_START_CONTEXT_SWITCH
651 static inline void arch_start_context_switch(struct task_struct *prev)
653 PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
656 static inline void arch_end_context_switch(struct task_struct *next)
658 PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
661 #define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
662 static inline void arch_enter_lazy_mmu_mode(void)
664 PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
667 static inline void arch_leave_lazy_mmu_mode(void)
669 PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
672 static inline void arch_flush_lazy_mmu_mode(void)
674 PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush);
677 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
678 phys_addr_t phys, pgprot_t flags)
680 pv_mmu_ops.set_fixmap(idx, phys, flags);
683 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
685 #ifdef CONFIG_QUEUED_SPINLOCKS
687 static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock,
690 PVOP_VCALL2(pv_lock_ops.queued_spin_lock_slowpath, lock, val);
693 static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock)
695 PVOP_VCALLEE1(pv_lock_ops.queued_spin_unlock, lock);
698 static __always_inline void pv_wait(u8 *ptr, u8 val)
700 PVOP_VCALL2(pv_lock_ops.wait, ptr, val);
703 static __always_inline void pv_kick(int cpu)
705 PVOP_VCALL1(pv_lock_ops.kick, cpu);
708 #else /* !CONFIG_QUEUED_SPINLOCKS */
710 static __always_inline void __ticket_lock_spinning(struct arch_spinlock *lock,
713 PVOP_VCALLEE2(pv_lock_ops.lock_spinning, lock, ticket);
716 static __always_inline void __ticket_unlock_kick(struct arch_spinlock *lock,
719 PVOP_VCALL2(pv_lock_ops.unlock_kick, lock, ticket);
722 #endif /* CONFIG_QUEUED_SPINLOCKS */
724 #endif /* SMP && PARAVIRT_SPINLOCKS */
727 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
728 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
730 /* save and restore all caller-save registers, except return value */
731 #define PV_SAVE_ALL_CALLER_REGS "pushl %ecx;"
732 #define PV_RESTORE_ALL_CALLER_REGS "popl %ecx;"
734 #define PV_FLAGS_ARG "0"
735 #define PV_EXTRA_CLOBBERS
736 #define PV_VEXTRA_CLOBBERS
738 /* save and restore all caller-save registers, except return value */
739 #define PV_SAVE_ALL_CALLER_REGS \
748 #define PV_RESTORE_ALL_CALLER_REGS \
758 /* We save some registers, but all of them, that's too much. We clobber all
759 * caller saved registers but the argument parameter */
760 #define PV_SAVE_REGS "pushq %%rdi;"
761 #define PV_RESTORE_REGS "popq %%rdi;"
762 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
763 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
764 #define PV_FLAGS_ARG "D"
768 * Generate a thunk around a function which saves all caller-save
769 * registers except for the return value. This allows C functions to
770 * be called from assembler code where fewer than normal registers are
771 * available. It may also help code generation around calls from C
772 * code if the common case doesn't use many registers.
774 * When a callee is wrapped in a thunk, the caller can assume that all
775 * arg regs and all scratch registers are preserved across the
776 * call. The return value in rax/eax will not be saved, even for void
779 #define PV_CALLEE_SAVE_REGS_THUNK(func) \
780 extern typeof(func) __raw_callee_save_##func; \
782 asm(".pushsection .text;" \
783 ".globl __raw_callee_save_" #func " ; " \
784 "__raw_callee_save_" #func ": " \
785 PV_SAVE_ALL_CALLER_REGS \
787 PV_RESTORE_ALL_CALLER_REGS \
791 /* Get a reference to a callee-save function */
792 #define PV_CALLEE_SAVE(func) \
793 ((struct paravirt_callee_save) { __raw_callee_save_##func })
795 /* Promise that "func" already uses the right calling convention */
796 #define __PV_IS_CALLEE_SAVE(func) \
797 ((struct paravirt_callee_save) { func })
799 static inline notrace unsigned long arch_local_save_flags(void)
801 return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
804 static inline notrace void arch_local_irq_restore(unsigned long f)
806 PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
809 static inline notrace void arch_local_irq_disable(void)
811 PVOP_VCALLEE0(pv_irq_ops.irq_disable);
814 static inline notrace void arch_local_irq_enable(void)
816 PVOP_VCALLEE0(pv_irq_ops.irq_enable);
819 static inline notrace unsigned long arch_local_irq_save(void)
823 f = arch_local_save_flags();
824 arch_local_irq_disable();
829 /* Make sure as little as possible of this mess escapes. */
844 extern void default_banner(void);
846 #else /* __ASSEMBLY__ */
848 #define _PVSITE(ptype, clobbers, ops, word, algn) \
852 .pushsection .parainstructions,"a"; \
861 #define COND_PUSH(set, mask, reg) \
862 .if ((~(set)) & mask); push %reg; .endif
863 #define COND_POP(set, mask, reg) \
864 .if ((~(set)) & mask); pop %reg; .endif
868 #define PV_SAVE_REGS(set) \
869 COND_PUSH(set, CLBR_RAX, rax); \
870 COND_PUSH(set, CLBR_RCX, rcx); \
871 COND_PUSH(set, CLBR_RDX, rdx); \
872 COND_PUSH(set, CLBR_RSI, rsi); \
873 COND_PUSH(set, CLBR_RDI, rdi); \
874 COND_PUSH(set, CLBR_R8, r8); \
875 COND_PUSH(set, CLBR_R9, r9); \
876 COND_PUSH(set, CLBR_R10, r10); \
877 COND_PUSH(set, CLBR_R11, r11)
878 #define PV_RESTORE_REGS(set) \
879 COND_POP(set, CLBR_R11, r11); \
880 COND_POP(set, CLBR_R10, r10); \
881 COND_POP(set, CLBR_R9, r9); \
882 COND_POP(set, CLBR_R8, r8); \
883 COND_POP(set, CLBR_RDI, rdi); \
884 COND_POP(set, CLBR_RSI, rsi); \
885 COND_POP(set, CLBR_RDX, rdx); \
886 COND_POP(set, CLBR_RCX, rcx); \
887 COND_POP(set, CLBR_RAX, rax)
889 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 8)
890 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
891 #define PARA_INDIRECT(addr) *addr(%rip)
893 #define PV_SAVE_REGS(set) \
894 COND_PUSH(set, CLBR_EAX, eax); \
895 COND_PUSH(set, CLBR_EDI, edi); \
896 COND_PUSH(set, CLBR_ECX, ecx); \
897 COND_PUSH(set, CLBR_EDX, edx)
898 #define PV_RESTORE_REGS(set) \
899 COND_POP(set, CLBR_EDX, edx); \
900 COND_POP(set, CLBR_ECX, ecx); \
901 COND_POP(set, CLBR_EDI, edi); \
902 COND_POP(set, CLBR_EAX, eax)
904 #define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 4)
905 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
906 #define PARA_INDIRECT(addr) *%cs:addr
909 #define INTERRUPT_RETURN \
910 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE, \
911 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
913 #define DISABLE_INTERRUPTS(clobbers) \
914 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
915 PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE); \
916 call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable); \
917 PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
919 #define ENABLE_INTERRUPTS(clobbers) \
920 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers, \
921 PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE); \
922 call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable); \
923 PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
925 #define USERGS_SYSRET32 \
926 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret32), \
928 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret32))
931 #define GET_CR0_INTO_EAX \
932 push %ecx; push %edx; \
933 call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
936 #define ENABLE_INTERRUPTS_SYSEXIT \
937 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit), \
939 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
942 #else /* !CONFIG_X86_32 */
945 * If swapgs is used while the userspace stack is still current,
946 * there's no way to call a pvop. The PV replacement *must* be
947 * inlined, or the swapgs instruction must be trapped and emulated.
949 #define SWAPGS_UNSAFE_STACK \
950 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \
954 * Note: swapgs is very special, and in practise is either going to be
955 * implemented with a single "swapgs" instruction or something very
956 * special. Either way, we don't need to save any registers for
960 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \
961 call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs) \
964 #define GET_CR2_INTO_RAX \
965 call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
967 #define PARAVIRT_ADJUST_EXCEPTION_FRAME \
968 PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
970 call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
972 #define USERGS_SYSRET64 \
973 PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64), \
975 jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
976 #endif /* CONFIG_X86_32 */
978 #endif /* __ASSEMBLY__ */
979 #else /* CONFIG_PARAVIRT */
980 # define default_banner x86_init_noop
982 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
983 struct mm_struct *mm)
987 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
990 #endif /* __ASSEMBLY__ */
991 #endif /* !CONFIG_PARAVIRT */
992 #endif /* _ASM_X86_PARAVIRT_H */