1 #ifndef _ASM_X86_PARAVIRT_TYPES_H
2 #define _ASM_X86_PARAVIRT_TYPES_H
4 /* Bitmask of what can be clobbered: usually at least eax. */
6 #define CLBR_EAX (1 << 0)
7 #define CLBR_ECX (1 << 1)
8 #define CLBR_EDX (1 << 2)
9 #define CLBR_EDI (1 << 3)
12 /* CLBR_ANY should match all regs platform has. For i386, that's just it */
13 #define CLBR_ANY ((1 << 4) - 1)
15 #define CLBR_ARG_REGS (CLBR_EAX | CLBR_EDX | CLBR_ECX)
16 #define CLBR_RET_REG (CLBR_EAX | CLBR_EDX)
17 #define CLBR_SCRATCH (0)
19 #define CLBR_RAX CLBR_EAX
20 #define CLBR_RCX CLBR_ECX
21 #define CLBR_RDX CLBR_EDX
22 #define CLBR_RDI CLBR_EDI
23 #define CLBR_RSI (1 << 4)
24 #define CLBR_R8 (1 << 5)
25 #define CLBR_R9 (1 << 6)
26 #define CLBR_R10 (1 << 7)
27 #define CLBR_R11 (1 << 8)
29 #define CLBR_ANY ((1 << 9) - 1)
31 #define CLBR_ARG_REGS (CLBR_RDI | CLBR_RSI | CLBR_RDX | \
32 CLBR_RCX | CLBR_R8 | CLBR_R9)
33 #define CLBR_RET_REG (CLBR_RAX)
34 #define CLBR_SCRATCH (CLBR_R10 | CLBR_R11)
38 #define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
42 #include <asm/desc_defs.h>
43 #include <asm/kmap_types.h>
44 #include <asm/pgtable_types.h>
56 * Wrapper type for pointers to code which uses the non-standard
57 * calling convention. See PV_CALL_SAVE_REGS_THUNK below.
59 struct paravirt_callee_save {
65 unsigned int kernel_rpl;
66 int shared_kernel_pmd;
69 u16 extra_user_64bit_cs; /* __USER_CS if none */
77 * Patch may replace one of the defined code sequences with
78 * arbitrary code, subject to the same register constraints.
79 * This generally means the code is not free to clobber any
80 * registers other than EAX. The patch function should return
81 * the number of bytes of code generated, as we nop pad the
82 * rest in generic code.
84 unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
85 unsigned long addr, unsigned len);
90 /* Set deferred update mode, used for batching operations. */
97 unsigned long long (*sched_clock)(void);
98 unsigned long long (*steal_clock)(int cpu);
102 /* hooks for various privileged instructions */
103 unsigned long (*get_debugreg)(int regno);
104 void (*set_debugreg)(int regno, unsigned long value);
106 unsigned long (*read_cr0)(void);
107 void (*write_cr0)(unsigned long);
109 unsigned long (*read_cr4)(void);
110 void (*write_cr4)(unsigned long);
113 unsigned long (*read_cr8)(void);
114 void (*write_cr8)(unsigned long);
117 /* Segment descriptor handling */
118 void (*load_tr_desc)(void);
119 void (*load_gdt)(const struct desc_ptr *);
120 void (*load_idt)(const struct desc_ptr *);
121 /* store_gdt has been removed. */
122 void (*store_idt)(struct desc_ptr *);
123 void (*set_ldt)(const void *desc, unsigned entries);
124 unsigned long (*store_tr)(void);
125 void (*load_tls)(struct thread_struct *t, unsigned int cpu);
127 void (*load_gs_index)(unsigned int idx);
129 void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
131 void (*write_gdt_entry)(struct desc_struct *,
132 int entrynum, const void *desc, int size);
133 void (*write_idt_entry)(gate_desc *,
134 int entrynum, const gate_desc *gate);
135 void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
136 void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
138 void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
140 void (*set_iopl_mask)(unsigned mask);
142 void (*wbinvd)(void);
143 void (*io_delay)(void);
145 /* cpuid emulation, mostly so that caps bits can be disabled */
146 void (*cpuid)(unsigned int *eax, unsigned int *ebx,
147 unsigned int *ecx, unsigned int *edx);
149 /* Unsafe MSR operations. These will warn or panic on failure. */
150 u64 (*read_msr)(unsigned int msr);
151 void (*write_msr)(unsigned int msr, unsigned low, unsigned high);
154 * Safe MSR operations.
155 * read sets err to 0 or -EIO. write returns 0 or -EIO.
157 u64 (*read_msr_safe)(unsigned int msr, int *err);
158 int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);
160 u64 (*read_pmc)(int counter);
163 * Switch to usermode gs and return to 64-bit usermode using
164 * sysret. Only used in 64-bit kernels to return to 64-bit
165 * processes. Usermode register state, including %rsp, must
166 * already be restored.
168 void (*usergs_sysret64)(void);
170 /* Normal iret. Jump to this with the standard iret stack
174 void (*swapgs)(void);
176 void (*start_context_switch)(struct task_struct *prev);
177 void (*end_context_switch)(struct task_struct *next);
182 * Get/set interrupt state. save_fl and restore_fl are only
183 * expected to use X86_EFLAGS_IF; all other bits
184 * returned from save_fl are undefined, and may be ignored by
187 * NOTE: These functions callers expect the callee to preserve
188 * more registers than the standard C calling convention.
190 struct paravirt_callee_save save_fl;
191 struct paravirt_callee_save restore_fl;
192 struct paravirt_callee_save irq_disable;
193 struct paravirt_callee_save irq_enable;
195 void (*safe_halt)(void);
199 void (*adjust_exception_frame)(void);
204 unsigned long (*read_cr2)(void);
205 void (*write_cr2)(unsigned long);
207 unsigned long (*read_cr3)(void);
208 void (*write_cr3)(unsigned long);
211 * Hooks for intercepting the creation/use/destruction of an
214 void (*activate_mm)(struct mm_struct *prev,
215 struct mm_struct *next);
216 void (*dup_mmap)(struct mm_struct *oldmm,
217 struct mm_struct *mm);
218 void (*exit_mmap)(struct mm_struct *mm);
222 void (*flush_tlb_user)(void);
223 void (*flush_tlb_kernel)(void);
224 void (*flush_tlb_single)(unsigned long addr);
225 void (*flush_tlb_others)(const struct cpumask *cpus,
226 struct mm_struct *mm,
230 /* Hooks for allocating and freeing a pagetable top-level */
231 int (*pgd_alloc)(struct mm_struct *mm);
232 void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
235 * Hooks for allocating/releasing pagetable pages when they're
236 * attached to a pagetable
238 void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
239 void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
240 void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
241 void (*release_pte)(unsigned long pfn);
242 void (*release_pmd)(unsigned long pfn);
243 void (*release_pud)(unsigned long pfn);
245 /* Pagetable manipulation functions */
246 void (*set_pte)(pte_t *ptep, pte_t pteval);
247 void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
248 pte_t *ptep, pte_t pteval);
249 void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
250 void (*set_pmd_at)(struct mm_struct *mm, unsigned long addr,
251 pmd_t *pmdp, pmd_t pmdval);
252 void (*pte_update)(struct mm_struct *mm, unsigned long addr,
255 pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
257 void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
258 pte_t *ptep, pte_t pte);
260 struct paravirt_callee_save pte_val;
261 struct paravirt_callee_save make_pte;
263 struct paravirt_callee_save pgd_val;
264 struct paravirt_callee_save make_pgd;
266 #if CONFIG_PGTABLE_LEVELS >= 3
267 #ifdef CONFIG_X86_PAE
268 void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
269 void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
271 void (*pmd_clear)(pmd_t *pmdp);
273 #endif /* CONFIG_X86_PAE */
275 void (*set_pud)(pud_t *pudp, pud_t pudval);
277 struct paravirt_callee_save pmd_val;
278 struct paravirt_callee_save make_pmd;
280 #if CONFIG_PGTABLE_LEVELS == 4
281 struct paravirt_callee_save pud_val;
282 struct paravirt_callee_save make_pud;
284 void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
285 #endif /* CONFIG_PGTABLE_LEVELS == 4 */
286 #endif /* CONFIG_PGTABLE_LEVELS >= 3 */
288 struct pv_lazy_ops lazy_mode;
292 /* Sometimes the physical address is a pfn, and sometimes its
293 an mfn. We can tell which is which from the index. */
294 void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
295 phys_addr_t phys, pgprot_t flags);
298 struct arch_spinlock;
300 #include <asm/spinlock_types.h>
306 void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
307 struct paravirt_callee_save queued_spin_unlock;
309 void (*wait)(u8 *ptr, u8 val);
310 void (*kick)(int cpu);
312 struct paravirt_callee_save vcpu_is_preempted;
315 /* This contains all the paravirt structures: we get a convenient
316 * number for each function using the offset which we use to indicate
318 struct paravirt_patch_template {
319 struct pv_init_ops pv_init_ops;
320 struct pv_time_ops pv_time_ops;
321 struct pv_cpu_ops pv_cpu_ops;
322 struct pv_irq_ops pv_irq_ops;
323 struct pv_mmu_ops pv_mmu_ops;
324 struct pv_lock_ops pv_lock_ops;
327 extern struct pv_info pv_info;
328 extern struct pv_init_ops pv_init_ops;
329 extern struct pv_time_ops pv_time_ops;
330 extern struct pv_cpu_ops pv_cpu_ops;
331 extern struct pv_irq_ops pv_irq_ops;
332 extern struct pv_mmu_ops pv_mmu_ops;
333 extern struct pv_lock_ops pv_lock_ops;
335 #define PARAVIRT_PATCH(x) \
336 (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
338 #define paravirt_type(op) \
339 [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \
340 [paravirt_opptr] "i" (&(op))
341 #define paravirt_clobber(clobber) \
342 [paravirt_clobber] "i" (clobber)
345 * Generate some code, and mark it as patchable by the
346 * apply_paravirt() alternate instruction patcher.
348 #define _paravirt_alt(insn_string, type, clobber) \
349 "771:\n\t" insn_string "\n" "772:\n" \
350 ".pushsection .parainstructions,\"a\"\n" \
353 " .byte " type "\n" \
354 " .byte 772b-771b\n" \
355 " .short " clobber "\n" \
358 /* Generate patchable code, with the default asm parameters. */
359 #define paravirt_alt(insn_string) \
360 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
362 /* Simple instruction patching code. */
363 #define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
365 #define DEF_NATIVE(ops, name, code) \
366 __visible extern const char start_##ops##_##name[], end_##ops##_##name[]; \
367 asm(NATIVE_LABEL("start_", ops, name) code NATIVE_LABEL("end_", ops, name))
369 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
370 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
371 unsigned paravirt_patch_call(void *insnbuf,
372 const void *target, u16 tgt_clobbers,
373 unsigned long addr, u16 site_clobbers,
375 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
376 unsigned long addr, unsigned len);
377 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
378 unsigned long addr, unsigned len);
380 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
381 const char *start, const char *end);
383 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
384 unsigned long addr, unsigned len);
386 int paravirt_disable_iospace(void);
389 * This generates an indirect call based on the operation type number.
390 * The type number, computed in PARAVIRT_PATCH, is derived from the
391 * offset into the paravirt_patch_template structure, and can therefore be
392 * freely converted back into a structure offset.
394 #define PARAVIRT_CALL "call *%c[paravirt_opptr];"
397 * These macros are intended to wrap calls through one of the paravirt
398 * ops structs, so that they can be later identified and patched at
401 * Normally, a call to a pv_op function is a simple indirect call:
402 * (pv_op_struct.operations)(args...).
404 * Unfortunately, this is a relatively slow operation for modern CPUs,
405 * because it cannot necessarily determine what the destination
406 * address is. In this case, the address is a runtime constant, so at
407 * the very least we can patch the call to e a simple direct call, or
408 * ideally, patch an inline implementation into the callsite. (Direct
409 * calls are essentially free, because the call and return addresses
410 * are completely predictable.)
412 * For i386, these macros rely on the standard gcc "regparm(3)" calling
413 * convention, in which the first three arguments are placed in %eax,
414 * %edx, %ecx (in that order), and the remaining arguments are placed
415 * on the stack. All caller-save registers (eax,edx,ecx) are expected
416 * to be modified (either clobbered or used for return values).
417 * X86_64, on the other hand, already specifies a register-based calling
418 * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
419 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
420 * special handling for dealing with 4 arguments, unlike i386.
421 * However, x86_64 also have to clobber all caller saved registers, which
422 * unfortunately, are quite a bit (r8 - r11)
424 * The call instruction itself is marked by placing its start address
425 * and size into the .parainstructions section, so that
426 * apply_paravirt() in arch/i386/kernel/alternative.c can do the
427 * appropriate patching under the control of the backend pv_init_ops
430 * Unfortunately there's no way to get gcc to generate the args setup
431 * for the call, and then allow the call itself to be generated by an
432 * inline asm. Because of this, we must do the complete arg setup and
433 * return value handling from within these macros. This is fairly
436 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
437 * It could be extended to more arguments, but there would be little
438 * to be gained from that. For each number of arguments, there are
439 * the two VCALL and CALL variants for void and non-void functions.
441 * When there is a return value, the invoker of the macro must specify
442 * the return type. The macro then uses sizeof() on that type to
443 * determine whether its a 32 or 64 bit value, and places the return
444 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
445 * 64-bit). For x86_64 machines, it just returns at %rax regardless of
446 * the return value size.
448 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
449 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
452 * Small structures are passed and returned in registers. The macro
453 * calling convention can't directly deal with this, so the wrapper
454 * functions must do this.
456 * These PVOP_* macros are only defined within this header. This
457 * means that all uses must be wrapped in inline functions. This also
458 * makes sure the incoming and outgoing types are always correct.
461 #define PVOP_VCALL_ARGS \
462 unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx; \
463 register void *__sp asm("esp")
464 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS
466 #define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x))
467 #define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x))
468 #define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x))
470 #define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
472 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
474 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx)
475 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
477 #define EXTRA_CLOBBERS
478 #define VEXTRA_CLOBBERS
479 #else /* CONFIG_X86_64 */
480 /* [re]ax isn't an arg, but the return val */
481 #define PVOP_VCALL_ARGS \
482 unsigned long __edi = __edi, __esi = __esi, \
483 __edx = __edx, __ecx = __ecx, __eax = __eax; \
484 register void *__sp asm("rsp")
485 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS
487 #define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x))
488 #define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x))
489 #define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x))
490 #define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x))
492 #define PVOP_VCALL_CLOBBERS "=D" (__edi), \
493 "=S" (__esi), "=d" (__edx), \
495 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
497 /* void functions are still allowed [re]ax for scratch */
498 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax)
499 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
501 #define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
502 #define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
503 #endif /* CONFIG_X86_32 */
505 #ifdef CONFIG_PARAVIRT_DEBUG
506 #define PVOP_TEST_NULL(op) BUG_ON(op == NULL)
508 #define PVOP_TEST_NULL(op) ((void)op)
511 #define PVOP_RETMASK(rettype) \
512 ({ unsigned long __mask = ~0UL; \
513 switch (sizeof(rettype)) { \
514 case 1: __mask = 0xffUL; break; \
515 case 2: __mask = 0xffffUL; break; \
516 case 4: __mask = 0xffffffffUL; break; \
523 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \
528 PVOP_TEST_NULL(op); \
529 /* This is 32-bit specific, but is okay in 64-bit */ \
530 /* since this condition will never hold */ \
531 if (sizeof(rettype) > sizeof(unsigned long)) { \
533 paravirt_alt(PARAVIRT_CALL) \
535 : call_clbr, "+r" (__sp) \
536 : paravirt_type(op), \
537 paravirt_clobber(clbr), \
539 : "memory", "cc" extra_clbr); \
540 __ret = (rettype)((((u64)__edx) << 32) | __eax); \
543 paravirt_alt(PARAVIRT_CALL) \
545 : call_clbr, "+r" (__sp) \
546 : paravirt_type(op), \
547 paravirt_clobber(clbr), \
549 : "memory", "cc" extra_clbr); \
550 __ret = (rettype)(__eax & PVOP_RETMASK(rettype)); \
555 #define __PVOP_CALL(rettype, op, pre, post, ...) \
556 ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \
557 EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
559 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \
560 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
561 PVOP_CALLEE_CLOBBERS, , \
562 pre, post, ##__VA_ARGS__)
565 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
568 PVOP_TEST_NULL(op); \
570 paravirt_alt(PARAVIRT_CALL) \
572 : call_clbr, "+r" (__sp) \
573 : paravirt_type(op), \
574 paravirt_clobber(clbr), \
576 : "memory", "cc" extra_clbr); \
579 #define __PVOP_VCALL(op, pre, post, ...) \
580 ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
582 pre, post, ##__VA_ARGS__)
584 #define __PVOP_VCALLEESAVE(op, pre, post, ...) \
585 ____PVOP_VCALL(op.func, CLBR_RET_REG, \
586 PVOP_VCALLEE_CLOBBERS, , \
587 pre, post, ##__VA_ARGS__)
591 #define PVOP_CALL0(rettype, op) \
592 __PVOP_CALL(rettype, op, "", "")
593 #define PVOP_VCALL0(op) \
594 __PVOP_VCALL(op, "", "")
596 #define PVOP_CALLEE0(rettype, op) \
597 __PVOP_CALLEESAVE(rettype, op, "", "")
598 #define PVOP_VCALLEE0(op) \
599 __PVOP_VCALLEESAVE(op, "", "")
602 #define PVOP_CALL1(rettype, op, arg1) \
603 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
604 #define PVOP_VCALL1(op, arg1) \
605 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
607 #define PVOP_CALLEE1(rettype, op, arg1) \
608 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
609 #define PVOP_VCALLEE1(op, arg1) \
610 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
613 #define PVOP_CALL2(rettype, op, arg1, arg2) \
614 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
615 PVOP_CALL_ARG2(arg2))
616 #define PVOP_VCALL2(op, arg1, arg2) \
617 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
618 PVOP_CALL_ARG2(arg2))
620 #define PVOP_CALLEE2(rettype, op, arg1, arg2) \
621 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
622 PVOP_CALL_ARG2(arg2))
623 #define PVOP_VCALLEE2(op, arg1, arg2) \
624 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \
625 PVOP_CALL_ARG2(arg2))
628 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
629 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
630 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
631 #define PVOP_VCALL3(op, arg1, arg2, arg3) \
632 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
633 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
635 /* This is the only difference in x86_64. We can make it much simpler */
637 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
638 __PVOP_CALL(rettype, op, \
639 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
640 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
641 PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
642 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
644 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
645 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \
646 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
648 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
649 __PVOP_CALL(rettype, op, "", "", \
650 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
651 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
652 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
653 __PVOP_VCALL(op, "", "", \
654 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
655 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
658 /* Lazy mode for batching updates / context switch */
659 enum paravirt_lazy_mode {
665 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
666 void paravirt_start_context_switch(struct task_struct *prev);
667 void paravirt_end_context_switch(struct task_struct *next);
669 void paravirt_enter_lazy_mmu(void);
670 void paravirt_leave_lazy_mmu(void);
671 void paravirt_flush_lazy_mmu(void);
673 void _paravirt_nop(void);
674 u32 _paravirt_ident_32(u32);
675 u64 _paravirt_ident_64(u64);
677 #define paravirt_nop ((void *)_paravirt_nop)
679 /* These all sit in the .parainstructions section to tell us what to patch. */
680 struct paravirt_patch_site {
681 u8 *instr; /* original instructions */
682 u8 instrtype; /* type of this instruction */
683 u8 len; /* length of original instruction */
684 u16 clobbers; /* what registers you may clobber */
687 extern struct paravirt_patch_site __parainstructions[],
688 __parainstructions_end[];
690 #endif /* __ASSEMBLY__ */
692 #endif /* _ASM_X86_PARAVIRT_TYPES_H */