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>
55 * Wrapper type for pointers to code which uses the non-standard
56 * calling convention. See PV_CALL_SAVE_REGS_THUNK below.
58 struct paravirt_callee_save {
64 unsigned int kernel_rpl;
65 int shared_kernel_pmd;
72 * Patch may replace one of the defined code sequences with
73 * arbitrary code, subject to the same register constraints.
74 * This generally means the code is not free to clobber any
75 * registers other than EAX. The patch function should return
76 * the number of bytes of code generated, as we nop pad the
77 * rest in generic code.
79 unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
80 unsigned long addr, unsigned len);
85 /* Set deferred update mode, used for batching operations. */
91 void (*time_init)(void);
93 /* Set and set time of day */
94 unsigned long (*get_wallclock)(void);
95 int (*set_wallclock)(unsigned long);
97 unsigned long long (*sched_clock)(void);
98 unsigned long (*get_tsc_khz)(void);
102 /* hooks for various privileged instructions */
103 unsigned long (*get_debugreg)(int regno);
104 void (*set_debugreg)(int regno, unsigned long value);
108 unsigned long (*read_cr0)(void);
109 void (*write_cr0)(unsigned long);
111 unsigned long (*read_cr4_safe)(void);
112 unsigned long (*read_cr4)(void);
113 void (*write_cr4)(unsigned long);
116 unsigned long (*read_cr8)(void);
117 void (*write_cr8)(unsigned long);
120 /* Segment descriptor handling */
121 void (*load_tr_desc)(void);
122 void (*load_gdt)(const struct desc_ptr *);
123 void (*load_idt)(const struct desc_ptr *);
124 void (*store_gdt)(struct desc_ptr *);
125 void (*store_idt)(struct desc_ptr *);
126 void (*set_ldt)(const void *desc, unsigned entries);
127 unsigned long (*store_tr)(void);
128 void (*load_tls)(struct thread_struct *t, unsigned int cpu);
130 void (*load_gs_index)(unsigned int idx);
132 void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
134 void (*write_gdt_entry)(struct desc_struct *,
135 int entrynum, const void *desc, int size);
136 void (*write_idt_entry)(gate_desc *,
137 int entrynum, const gate_desc *gate);
138 void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
139 void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
141 void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
143 void (*set_iopl_mask)(unsigned mask);
145 void (*wbinvd)(void);
146 void (*io_delay)(void);
148 /* cpuid emulation, mostly so that caps bits can be disabled */
149 void (*cpuid)(unsigned int *eax, unsigned int *ebx,
150 unsigned int *ecx, unsigned int *edx);
152 /* MSR, PMC and TSR operations.
153 err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
154 u64 (*read_msr_amd)(unsigned int msr, int *err);
155 u64 (*read_msr)(unsigned int msr, int *err);
156 int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
158 u64 (*read_tsc)(void);
159 u64 (*read_pmc)(int counter);
160 unsigned long long (*read_tscp)(unsigned int *aux);
163 * Atomically enable interrupts and return to userspace. This
164 * is only ever used to return to 32-bit processes; in a
165 * 64-bit kernel, it's used for 32-on-64 compat processes, but
166 * never native 64-bit processes. (Jump, not call.)
168 void (*irq_enable_sysexit)(void);
171 * Switch to usermode gs and return to 64-bit usermode using
172 * sysret. Only used in 64-bit kernels to return to 64-bit
173 * processes. Usermode register state, including %rsp, must
174 * already be restored.
176 void (*usergs_sysret64)(void);
179 * Switch to usermode gs and return to 32-bit usermode using
180 * sysret. Used to return to 32-on-64 compat processes.
181 * Other usermode register state, including %esp, must already
184 void (*usergs_sysret32)(void);
186 /* Normal iret. Jump to this with the standard iret stack
190 void (*swapgs)(void);
192 void (*start_context_switch)(struct task_struct *prev);
193 void (*end_context_switch)(struct task_struct *next);
198 * Get/set interrupt state. save_fl and restore_fl are only
199 * expected to use X86_EFLAGS_IF; all other bits
200 * returned from save_fl are undefined, and may be ignored by
203 * NOTE: These functions callers expect the callee to preserve
204 * more registers than the standard C calling convention.
206 struct paravirt_callee_save save_fl;
207 struct paravirt_callee_save restore_fl;
208 struct paravirt_callee_save irq_disable;
209 struct paravirt_callee_save irq_enable;
211 void (*safe_halt)(void);
215 void (*adjust_exception_frame)(void);
220 #ifdef CONFIG_X86_LOCAL_APIC
221 void (*startup_ipi_hook)(int phys_apicid,
222 unsigned long start_eip,
223 unsigned long start_esp);
228 unsigned long (*read_cr2)(void);
229 void (*write_cr2)(unsigned long);
231 unsigned long (*read_cr3)(void);
232 void (*write_cr3)(unsigned long);
235 * Hooks for intercepting the creation/use/destruction of an
238 void (*activate_mm)(struct mm_struct *prev,
239 struct mm_struct *next);
240 void (*dup_mmap)(struct mm_struct *oldmm,
241 struct mm_struct *mm);
242 void (*exit_mmap)(struct mm_struct *mm);
246 void (*flush_tlb_user)(void);
247 void (*flush_tlb_kernel)(void);
248 void (*flush_tlb_single)(unsigned long addr);
249 void (*flush_tlb_others)(const struct cpumask *cpus,
250 struct mm_struct *mm,
253 /* Hooks for allocating and freeing a pagetable top-level */
254 int (*pgd_alloc)(struct mm_struct *mm);
255 void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
258 * Hooks for allocating/releasing pagetable pages when they're
259 * attached to a pagetable
261 void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
262 void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
263 void (*alloc_pmd_clone)(unsigned long pfn, unsigned long clonepfn, unsigned long start, unsigned long count);
264 void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
265 void (*release_pte)(unsigned long pfn);
266 void (*release_pmd)(unsigned long pfn);
267 void (*release_pud)(unsigned long pfn);
269 /* Pagetable manipulation functions */
270 void (*set_pte)(pte_t *ptep, pte_t pteval);
271 void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
272 pte_t *ptep, pte_t pteval);
273 void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
274 void (*pte_update)(struct mm_struct *mm, unsigned long addr,
276 void (*pte_update_defer)(struct mm_struct *mm,
277 unsigned long addr, pte_t *ptep);
279 pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
281 void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
282 pte_t *ptep, pte_t pte);
284 struct paravirt_callee_save pte_val;
285 struct paravirt_callee_save make_pte;
287 struct paravirt_callee_save pgd_val;
288 struct paravirt_callee_save make_pgd;
290 #if PAGETABLE_LEVELS >= 3
291 #ifdef CONFIG_X86_PAE
292 void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
293 void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
295 void (*pmd_clear)(pmd_t *pmdp);
297 #endif /* CONFIG_X86_PAE */
299 void (*set_pud)(pud_t *pudp, pud_t pudval);
301 struct paravirt_callee_save pmd_val;
302 struct paravirt_callee_save make_pmd;
304 #if PAGETABLE_LEVELS == 4
305 struct paravirt_callee_save pud_val;
306 struct paravirt_callee_save make_pud;
308 void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
309 #endif /* PAGETABLE_LEVELS == 4 */
310 #endif /* PAGETABLE_LEVELS >= 3 */
312 #ifdef CONFIG_HIGHPTE
313 void *(*kmap_atomic_pte)(struct page *page, enum km_type type);
316 struct pv_lazy_ops lazy_mode;
320 /* Sometimes the physical address is a pfn, and sometimes its
321 an mfn. We can tell which is which from the index. */
322 void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
323 phys_addr_t phys, pgprot_t flags);
328 int (*spin_is_locked)(struct raw_spinlock *lock);
329 int (*spin_is_contended)(struct raw_spinlock *lock);
330 void (*spin_lock)(struct raw_spinlock *lock);
331 void (*spin_lock_flags)(struct raw_spinlock *lock, unsigned long flags);
332 int (*spin_trylock)(struct raw_spinlock *lock);
333 void (*spin_unlock)(struct raw_spinlock *lock);
336 /* This contains all the paravirt structures: we get a convenient
337 * number for each function using the offset which we use to indicate
339 struct paravirt_patch_template {
340 struct pv_init_ops pv_init_ops;
341 struct pv_time_ops pv_time_ops;
342 struct pv_cpu_ops pv_cpu_ops;
343 struct pv_irq_ops pv_irq_ops;
344 struct pv_apic_ops pv_apic_ops;
345 struct pv_mmu_ops pv_mmu_ops;
346 struct pv_lock_ops pv_lock_ops;
349 extern struct pv_info pv_info;
350 extern struct pv_init_ops pv_init_ops;
351 extern struct pv_time_ops pv_time_ops;
352 extern struct pv_cpu_ops pv_cpu_ops;
353 extern struct pv_irq_ops pv_irq_ops;
354 extern struct pv_apic_ops pv_apic_ops;
355 extern struct pv_mmu_ops pv_mmu_ops;
356 extern struct pv_lock_ops pv_lock_ops;
358 #define PARAVIRT_PATCH(x) \
359 (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
361 #define paravirt_type(op) \
362 [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \
363 [paravirt_opptr] "i" (&(op))
364 #define paravirt_clobber(clobber) \
365 [paravirt_clobber] "i" (clobber)
368 * Generate some code, and mark it as patchable by the
369 * apply_paravirt() alternate instruction patcher.
371 #define _paravirt_alt(insn_string, type, clobber) \
372 "771:\n\t" insn_string "\n" "772:\n" \
373 ".pushsection .parainstructions,\"a\"\n" \
376 " .byte " type "\n" \
377 " .byte 772b-771b\n" \
378 " .short " clobber "\n" \
381 /* Generate patchable code, with the default asm parameters. */
382 #define paravirt_alt(insn_string) \
383 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
385 /* Simple instruction patching code. */
386 #define DEF_NATIVE(ops, name, code) \
387 extern const char start_##ops##_##name[], end_##ops##_##name[]; \
388 asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
390 unsigned paravirt_patch_nop(void);
391 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
392 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
393 unsigned paravirt_patch_ignore(unsigned len);
394 unsigned paravirt_patch_call(void *insnbuf,
395 const void *target, u16 tgt_clobbers,
396 unsigned long addr, u16 site_clobbers,
398 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
399 unsigned long addr, unsigned len);
400 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
401 unsigned long addr, unsigned len);
403 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
404 const char *start, const char *end);
406 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
407 unsigned long addr, unsigned len);
409 int paravirt_disable_iospace(void);
412 * This generates an indirect call based on the operation type number.
413 * The type number, computed in PARAVIRT_PATCH, is derived from the
414 * offset into the paravirt_patch_template structure, and can therefore be
415 * freely converted back into a structure offset.
417 #define PARAVIRT_CALL "call *%c[paravirt_opptr];"
420 * These macros are intended to wrap calls through one of the paravirt
421 * ops structs, so that they can be later identified and patched at
424 * Normally, a call to a pv_op function is a simple indirect call:
425 * (pv_op_struct.operations)(args...).
427 * Unfortunately, this is a relatively slow operation for modern CPUs,
428 * because it cannot necessarily determine what the destination
429 * address is. In this case, the address is a runtime constant, so at
430 * the very least we can patch the call to e a simple direct call, or
431 * ideally, patch an inline implementation into the callsite. (Direct
432 * calls are essentially free, because the call and return addresses
433 * are completely predictable.)
435 * For i386, these macros rely on the standard gcc "regparm(3)" calling
436 * convention, in which the first three arguments are placed in %eax,
437 * %edx, %ecx (in that order), and the remaining arguments are placed
438 * on the stack. All caller-save registers (eax,edx,ecx) are expected
439 * to be modified (either clobbered or used for return values).
440 * X86_64, on the other hand, already specifies a register-based calling
441 * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
442 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
443 * special handling for dealing with 4 arguments, unlike i386.
444 * However, x86_64 also have to clobber all caller saved registers, which
445 * unfortunately, are quite a bit (r8 - r11)
447 * The call instruction itself is marked by placing its start address
448 * and size into the .parainstructions section, so that
449 * apply_paravirt() in arch/i386/kernel/alternative.c can do the
450 * appropriate patching under the control of the backend pv_init_ops
453 * Unfortunately there's no way to get gcc to generate the args setup
454 * for the call, and then allow the call itself to be generated by an
455 * inline asm. Because of this, we must do the complete arg setup and
456 * return value handling from within these macros. This is fairly
459 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
460 * It could be extended to more arguments, but there would be little
461 * to be gained from that. For each number of arguments, there are
462 * the two VCALL and CALL variants for void and non-void functions.
464 * When there is a return value, the invoker of the macro must specify
465 * the return type. The macro then uses sizeof() on that type to
466 * determine whether its a 32 or 64 bit value, and places the return
467 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
468 * 64-bit). For x86_64 machines, it just returns at %rax regardless of
469 * the return value size.
471 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
472 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
475 * Small structures are passed and returned in registers. The macro
476 * calling convention can't directly deal with this, so the wrapper
477 * functions must do this.
479 * These PVOP_* macros are only defined within this header. This
480 * means that all uses must be wrapped in inline functions. This also
481 * makes sure the incoming and outgoing types are always correct.
484 #define PVOP_VCALL_ARGS \
485 unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
486 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS
488 #define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x))
489 #define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x))
490 #define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x))
492 #define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
494 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
496 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx)
497 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
499 #define EXTRA_CLOBBERS
500 #define VEXTRA_CLOBBERS
501 #else /* CONFIG_X86_64 */
502 #define PVOP_VCALL_ARGS \
503 unsigned long __edi = __edi, __esi = __esi, \
504 __edx = __edx, __ecx = __ecx
505 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS, __eax
507 #define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x))
508 #define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x))
509 #define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x))
510 #define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x))
512 #define PVOP_VCALL_CLOBBERS "=D" (__edi), \
513 "=S" (__esi), "=d" (__edx), \
515 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
517 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax)
518 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
520 #define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
521 #define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
522 #endif /* CONFIG_X86_32 */
524 #ifdef CONFIG_PARAVIRT_DEBUG
525 #define PVOP_TEST_NULL(op) BUG_ON(op == NULL)
527 #define PVOP_TEST_NULL(op) ((void)op)
530 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \
535 PVOP_TEST_NULL(op); \
536 /* This is 32-bit specific, but is okay in 64-bit */ \
537 /* since this condition will never hold */ \
538 if (sizeof(rettype) > sizeof(unsigned long)) { \
540 paravirt_alt(PARAVIRT_CALL) \
543 : paravirt_type(op), \
544 paravirt_clobber(clbr), \
546 : "memory", "cc" extra_clbr); \
547 __ret = (rettype)((((u64)__edx) << 32) | __eax); \
550 paravirt_alt(PARAVIRT_CALL) \
553 : paravirt_type(op), \
554 paravirt_clobber(clbr), \
556 : "memory", "cc" extra_clbr); \
557 __ret = (rettype)__eax; \
562 #define __PVOP_CALL(rettype, op, pre, post, ...) \
563 ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \
564 EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
566 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \
567 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
568 PVOP_CALLEE_CLOBBERS, , \
569 pre, post, ##__VA_ARGS__)
572 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
575 PVOP_TEST_NULL(op); \
577 paravirt_alt(PARAVIRT_CALL) \
580 : paravirt_type(op), \
581 paravirt_clobber(clbr), \
583 : "memory", "cc" extra_clbr); \
586 #define __PVOP_VCALL(op, pre, post, ...) \
587 ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \
589 pre, post, ##__VA_ARGS__)
591 #define __PVOP_VCALLEESAVE(rettype, op, pre, post, ...) \
592 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \
593 PVOP_VCALLEE_CLOBBERS, , \
594 pre, post, ##__VA_ARGS__)
598 #define PVOP_CALL0(rettype, op) \
599 __PVOP_CALL(rettype, op, "", "")
600 #define PVOP_VCALL0(op) \
601 __PVOP_VCALL(op, "", "")
603 #define PVOP_CALLEE0(rettype, op) \
604 __PVOP_CALLEESAVE(rettype, op, "", "")
605 #define PVOP_VCALLEE0(op) \
606 __PVOP_VCALLEESAVE(op, "", "")
609 #define PVOP_CALL1(rettype, op, arg1) \
610 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
611 #define PVOP_VCALL1(op, arg1) \
612 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
614 #define PVOP_CALLEE1(rettype, op, arg1) \
615 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
616 #define PVOP_VCALLEE1(op, arg1) \
617 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
620 #define PVOP_CALL2(rettype, op, arg1, arg2) \
621 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
622 PVOP_CALL_ARG2(arg2))
623 #define PVOP_VCALL2(op, arg1, arg2) \
624 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
625 PVOP_CALL_ARG2(arg2))
627 #define PVOP_CALLEE2(rettype, op, arg1, arg2) \
628 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
629 PVOP_CALL_ARG2(arg2))
630 #define PVOP_VCALLEE2(op, arg1, arg2) \
631 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \
632 PVOP_CALL_ARG2(arg2))
635 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
636 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \
637 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
638 #define PVOP_VCALL3(op, arg1, arg2, arg3) \
639 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \
640 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
642 /* This is the only difference in x86_64. We can make it much simpler */
644 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
645 __PVOP_CALL(rettype, op, \
646 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
647 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
648 PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
649 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
651 "push %[_arg4];", "lea 4(%%esp),%%esp;", \
652 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \
653 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
655 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
656 __PVOP_CALL(rettype, op, "", "", \
657 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
658 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
659 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
660 __PVOP_VCALL(op, "", "", \
661 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
662 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
665 /* Lazy mode for batching updates / context switch */
666 enum paravirt_lazy_mode {
672 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
673 void paravirt_start_context_switch(struct task_struct *prev);
674 void paravirt_end_context_switch(struct task_struct *next);
676 void paravirt_enter_lazy_mmu(void);
677 void paravirt_leave_lazy_mmu(void);
679 void _paravirt_nop(void);
680 u32 _paravirt_ident_32(u32);
681 u64 _paravirt_ident_64(u64);
683 #define paravirt_nop ((void *)_paravirt_nop)
685 /* These all sit in the .parainstructions section to tell us what to patch. */
686 struct paravirt_patch_site {
687 u8 *instr; /* original instructions */
688 u8 instrtype; /* type of this instruction */
689 u8 len; /* length of original instruction */
690 u16 clobbers; /* what registers you may clobber */
693 extern struct paravirt_patch_site __parainstructions[],
694 __parainstructions_end[];
696 #endif /* __ASSEMBLY__ */
698 #endif /* _ASM_X86_PARAVIRT_TYPES_H */