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

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  1 #ifndef _ASM_X86_PARAVIRT_TYPES_H
  2 #define _ASM_X86_PARAVIRT_TYPES_H
  3 
  4 /* Bitmask of what can be clobbered: usually at least eax. */
  5 #define CLBR_NONE 0
  6 #define CLBR_EAX  (1 << 0)
  7 #define CLBR_ECX  (1 << 1)
  8 #define CLBR_EDX  (1 << 2)
  9 #define CLBR_EDI  (1 << 3)
 10 
 11 #ifdef CONFIG_X86_32
 12 /* CLBR_ANY should match all regs platform has. For i386, that's just it */
 13 #define CLBR_ANY  ((1 << 4) - 1)
 14 
 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)
 18 #else
 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)
 28 
 29 #define CLBR_ANY  ((1 << 9) - 1)
 30 
 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)
 35 
 36 #endif /* X86_64 */
 37 
 38 #define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG)
 39 
 40 #ifndef __ASSEMBLY__
 41 
 42 #include <asm/desc_defs.h>
 43 #include <asm/kmap_types.h>
 44 
 45 struct page;
 46 struct thread_struct;
 47 struct desc_ptr;
 48 struct tss_struct;
 49 struct mm_struct;
 50 struct desc_struct;
 51 struct task_struct;
 52 struct cpumask;
 53 
 54 /*
 55  * Wrapper type for pointers to code which uses the non-standard
 56  * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
 57  */
 58 struct paravirt_callee_save {
 59         void *func;
 60 };
 61 
 62 /* general info */
 63 struct pv_info {
 64         unsigned int kernel_rpl;
 65         int shared_kernel_pmd;
 66         int paravirt_enabled;
 67         const char *name;
 68 };
 69 
 70 struct pv_init_ops {
 71         /*
 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.
 78          */
 79         unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
 80                           unsigned long addr, unsigned len);
 81 };
 82 
 83 
 84 struct pv_lazy_ops {
 85         /* Set deferred update mode, used for batching operations. */
 86         void (*enter)(void);
 87         void (*leave)(void);
 88         void (*flush)(void);
 89 };
 90 
 91 struct pv_time_ops {
 92         unsigned long long (*sched_clock)(void);
 93         unsigned long (*get_tsc_khz)(void);
 94 };
 95 
 96 struct pv_cpu_ops {
 97         /* hooks for various privileged instructions */
 98         unsigned long (*get_debugreg)(int regno);
 99         void (*set_debugreg)(int regno, unsigned long value);
100 
101         void (*clts)(void);
102 
103         unsigned long (*read_cr0)(void);
104         void (*write_cr0)(unsigned long);
105 
106         unsigned long (*read_cr4_safe)(void);
107         unsigned long (*read_cr4)(void);
108         void (*write_cr4)(unsigned long);
109 
110 #ifdef CONFIG_X86_64
111         unsigned long (*read_cr8)(void);
112         void (*write_cr8)(unsigned long);
113 #endif
114 
115         /* Segment descriptor handling */
116         void (*load_tr_desc)(void);
117         void (*load_gdt)(const struct desc_ptr *);
118         void (*load_idt)(const struct desc_ptr *);
119         void (*store_gdt)(struct desc_ptr *);
120         void (*store_idt)(struct desc_ptr *);
121         void (*set_ldt)(const void *desc, unsigned entries);
122         unsigned long (*store_tr)(void);
123         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
124 #ifdef CONFIG_X86_64
125         void (*load_gs_index)(unsigned int idx);
126 #endif
127         void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
128                                 const void *desc);
129         void (*write_gdt_entry)(struct desc_struct *,
130                                 int entrynum, const void *desc, int size);
131         void (*write_idt_entry)(gate_desc *,
132                                 int entrynum, const gate_desc *gate);
133         void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
134         void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
135 
136         void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
137 
138         void (*set_iopl_mask)(unsigned mask);
139 
140         void (*wbinvd)(void);
141         void (*io_delay)(void);
142 
143         /* cpuid emulation, mostly so that caps bits can be disabled */
144         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
145                       unsigned int *ecx, unsigned int *edx);
146 
147         /* MSR, PMC and TSR operations.
148            err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
149         u64 (*read_msr)(unsigned int msr, int *err);
150         int (*rdmsr_regs)(u32 *regs);
151         int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
152         int (*wrmsr_regs)(u32 *regs);
153 
154         u64 (*read_tsc)(void);
155         u64 (*read_pmc)(int counter);
156         unsigned long long (*read_tscp)(unsigned int *aux);
157 
158         /*
159          * Atomically enable interrupts and return to userspace.  This
160          * is only ever used to return to 32-bit processes; in a
161          * 64-bit kernel, it's used for 32-on-64 compat processes, but
162          * never native 64-bit processes.  (Jump, not call.)
163          */
164         void (*irq_enable_sysexit)(void);
165 
166         /*
167          * Switch to usermode gs and return to 64-bit usermode using
168          * sysret.  Only used in 64-bit kernels to return to 64-bit
169          * processes.  Usermode register state, including %rsp, must
170          * already be restored.
171          */
172         void (*usergs_sysret64)(void);
173 
174         /*
175          * Switch to usermode gs and return to 32-bit usermode using
176          * sysret.  Used to return to 32-on-64 compat processes.
177          * Other usermode register state, including %esp, must already
178          * be restored.
179          */
180         void (*usergs_sysret32)(void);
181 
182         /* Normal iret.  Jump to this with the standard iret stack
183            frame set up. */
184         void (*iret)(void);
185 
186         void (*swapgs)(void);
187 
188         void (*start_context_switch)(struct task_struct *prev);
189         void (*end_context_switch)(struct task_struct *next);
190 };
191 
192 struct pv_irq_ops {
193         /*
194          * Get/set interrupt state.  save_fl and restore_fl are only
195          * expected to use X86_EFLAGS_IF; all other bits
196          * returned from save_fl are undefined, and may be ignored by
197          * restore_fl.
198          *
199          * NOTE: These functions callers expect the callee to preserve
200          * more registers than the standard C calling convention.
201          */
202         struct paravirt_callee_save save_fl;
203         struct paravirt_callee_save restore_fl;
204         struct paravirt_callee_save irq_disable;
205         struct paravirt_callee_save irq_enable;
206 
207         void (*safe_halt)(void);
208         void (*halt)(void);
209 
210 #ifdef CONFIG_X86_64
211         void (*adjust_exception_frame)(void);
212 #endif
213 };
214 
215 struct pv_apic_ops {
216 #ifdef CONFIG_X86_LOCAL_APIC
217         void (*startup_ipi_hook)(int phys_apicid,
218                                  unsigned long start_eip,
219                                  unsigned long start_esp);
220 #endif
221 };
222 
223 struct pv_mmu_ops {
224         unsigned long (*read_cr2)(void);
225         void (*write_cr2)(unsigned long);
226 
227         unsigned long (*read_cr3)(void);
228         void (*write_cr3)(unsigned long);
229 
230         /*
231          * Hooks for intercepting the creation/use/destruction of an
232          * mm_struct.
233          */
234         void (*activate_mm)(struct mm_struct *prev,
235                             struct mm_struct *next);
236         void (*dup_mmap)(struct mm_struct *oldmm,
237                          struct mm_struct *mm);
238         void (*exit_mmap)(struct mm_struct *mm);
239 
240 
241         /* TLB operations */
242         void (*flush_tlb_user)(void);
243         void (*flush_tlb_kernel)(void);
244         void (*flush_tlb_single)(unsigned long addr);
245         void (*flush_tlb_others)(const struct cpumask *cpus,
246                                  struct mm_struct *mm,
247                                  unsigned long va);
248 
249         /* Hooks for allocating and freeing a pagetable top-level */
250         int  (*pgd_alloc)(struct mm_struct *mm);
251         void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
252 
253         /*
254          * Hooks for allocating/releasing pagetable pages when they're
255          * attached to a pagetable
256          */
257         void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
258         void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
259         void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
260         void (*release_pte)(unsigned long pfn);
261         void (*release_pmd)(unsigned long pfn);
262         void (*release_pud)(unsigned long pfn);
263 
264         /* Pagetable manipulation functions */
265         void (*set_pte)(pte_t *ptep, pte_t pteval);
266         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
267                            pte_t *ptep, pte_t pteval);
268         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
269         void (*set_pmd_at)(struct mm_struct *mm, unsigned long addr,
270                            pmd_t *pmdp, pmd_t pmdval);
271         void (*pte_update)(struct mm_struct *mm, unsigned long addr,
272                            pte_t *ptep);
273         void (*pte_update_defer)(struct mm_struct *mm,
274                                  unsigned long addr, pte_t *ptep);
275         void (*pmd_update)(struct mm_struct *mm, unsigned long addr,
276                            pmd_t *pmdp);
277         void (*pmd_update_defer)(struct mm_struct *mm,
278                                  unsigned long addr, pmd_t *pmdp);
279 
280         pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
281                                         pte_t *ptep);
282         void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
283                                         pte_t *ptep, pte_t pte);
284 
285         struct paravirt_callee_save pte_val;
286         struct paravirt_callee_save make_pte;
287 
288         struct paravirt_callee_save pgd_val;
289         struct paravirt_callee_save make_pgd;
290 
291 #if PAGETABLE_LEVELS >= 3
292 #ifdef CONFIG_X86_PAE
293         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
294         void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
295                           pte_t *ptep);
296         void (*pmd_clear)(pmd_t *pmdp);
297 
298 #endif  /* CONFIG_X86_PAE */
299 
300         void (*set_pud)(pud_t *pudp, pud_t pudval);
301 
302         struct paravirt_callee_save pmd_val;
303         struct paravirt_callee_save make_pmd;
304 
305 #if PAGETABLE_LEVELS == 4
306         struct paravirt_callee_save pud_val;
307         struct paravirt_callee_save make_pud;
308 
309         void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
310 #endif  /* PAGETABLE_LEVELS == 4 */
311 #endif  /* PAGETABLE_LEVELS >= 3 */
312 
313         struct pv_lazy_ops lazy_mode;
314 
315         /* dom0 ops */
316 
317         /* Sometimes the physical address is a pfn, and sometimes its
318            an mfn.  We can tell which is which from the index. */
319         void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
320                            phys_addr_t phys, pgprot_t flags);
321 };
322 
323 struct arch_spinlock;
324 struct pv_lock_ops {
325         int (*spin_is_locked)(struct arch_spinlock *lock);
326         int (*spin_is_contended)(struct arch_spinlock *lock);
327         void (*spin_lock)(struct arch_spinlock *lock);
328         void (*spin_lock_flags)(struct arch_spinlock *lock, unsigned long flags);
329         int (*spin_trylock)(struct arch_spinlock *lock);
330         void (*spin_unlock)(struct arch_spinlock *lock);
331 };
332 
333 /* This contains all the paravirt structures: we get a convenient
334  * number for each function using the offset which we use to indicate
335  * what to patch. */
336 struct paravirt_patch_template {
337         struct pv_init_ops pv_init_ops;
338         struct pv_time_ops pv_time_ops;
339         struct pv_cpu_ops pv_cpu_ops;
340         struct pv_irq_ops pv_irq_ops;
341         struct pv_apic_ops pv_apic_ops;
342         struct pv_mmu_ops pv_mmu_ops;
343         struct pv_lock_ops pv_lock_ops;
344 };
345 
346 extern struct pv_info pv_info;
347 extern struct pv_init_ops pv_init_ops;
348 extern struct pv_time_ops pv_time_ops;
349 extern struct pv_cpu_ops pv_cpu_ops;
350 extern struct pv_irq_ops pv_irq_ops;
351 extern struct pv_apic_ops pv_apic_ops;
352 extern struct pv_mmu_ops pv_mmu_ops;
353 extern struct pv_lock_ops pv_lock_ops;
354 
355 #define PARAVIRT_PATCH(x)                                       \
356         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
357 
358 #define paravirt_type(op)                               \
359         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
360         [paravirt_opptr] "i" (&(op))
361 #define paravirt_clobber(clobber)               \
362         [paravirt_clobber] "i" (clobber)
363 
364 /*
365  * Generate some code, and mark it as patchable by the
366  * apply_paravirt() alternate instruction patcher.
367  */
368 #define _paravirt_alt(insn_string, type, clobber)       \
369         "771:\n\t" insn_string "\n" "772:\n"            \
370         ".pushsection .parainstructions,\"a\"\n"        \
371         _ASM_ALIGN "\n"                                 \
372         _ASM_PTR " 771b\n"                              \
373         "  .byte " type "\n"                            \
374         "  .byte 772b-771b\n"                           \
375         "  .short " clobber "\n"                        \
376         ".popsection\n"
377 
378 /* Generate patchable code, with the default asm parameters. */
379 #define paravirt_alt(insn_string)                                       \
380         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
381 
382 /* Simple instruction patching code. */
383 #define DEF_NATIVE(ops, name, code)                                     \
384         extern const char start_##ops##_##name[], end_##ops##_##name[]; \
385         asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
386 
387 unsigned paravirt_patch_nop(void);
388 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
389 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
390 unsigned paravirt_patch_ignore(unsigned len);
391 unsigned paravirt_patch_call(void *insnbuf,
392                              const void *target, u16 tgt_clobbers,
393                              unsigned long addr, u16 site_clobbers,
394                              unsigned len);
395 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
396                             unsigned long addr, unsigned len);
397 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
398                                 unsigned long addr, unsigned len);
399 
400 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
401                               const char *start, const char *end);
402 
403 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
404                       unsigned long addr, unsigned len);
405 
406 int paravirt_disable_iospace(void);
407 
408 /*
409  * This generates an indirect call based on the operation type number.
410  * The type number, computed in PARAVIRT_PATCH, is derived from the
411  * offset into the paravirt_patch_template structure, and can therefore be
412  * freely converted back into a structure offset.
413  */
414 #define PARAVIRT_CALL   "call *%c[paravirt_opptr];"
415 
416 /*
417  * These macros are intended to wrap calls through one of the paravirt
418  * ops structs, so that they can be later identified and patched at
419  * runtime.
420  *
421  * Normally, a call to a pv_op function is a simple indirect call:
422  * (pv_op_struct.operations)(args...).
423  *
424  * Unfortunately, this is a relatively slow operation for modern CPUs,
425  * because it cannot necessarily determine what the destination
426  * address is.  In this case, the address is a runtime constant, so at
427  * the very least we can patch the call to e a simple direct call, or
428  * ideally, patch an inline implementation into the callsite.  (Direct
429  * calls are essentially free, because the call and return addresses
430  * are completely predictable.)
431  *
432  * For i386, these macros rely on the standard gcc "regparm(3)" calling
433  * convention, in which the first three arguments are placed in %eax,
434  * %edx, %ecx (in that order), and the remaining arguments are placed
435  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
436  * to be modified (either clobbered or used for return values).
437  * X86_64, on the other hand, already specifies a register-based calling
438  * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
439  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
440  * special handling for dealing with 4 arguments, unlike i386.
441  * However, x86_64 also have to clobber all caller saved registers, which
442  * unfortunately, are quite a bit (r8 - r11)
443  *
444  * The call instruction itself is marked by placing its start address
445  * and size into the .parainstructions section, so that
446  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
447  * appropriate patching under the control of the backend pv_init_ops
448  * implementation.
449  *
450  * Unfortunately there's no way to get gcc to generate the args setup
451  * for the call, and then allow the call itself to be generated by an
452  * inline asm.  Because of this, we must do the complete arg setup and
453  * return value handling from within these macros.  This is fairly
454  * cumbersome.
455  *
456  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
457  * It could be extended to more arguments, but there would be little
458  * to be gained from that.  For each number of arguments, there are
459  * the two VCALL and CALL variants for void and non-void functions.
460  *
461  * When there is a return value, the invoker of the macro must specify
462  * the return type.  The macro then uses sizeof() on that type to
463  * determine whether its a 32 or 64 bit value, and places the return
464  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
465  * 64-bit). For x86_64 machines, it just returns at %rax regardless of
466  * the return value size.
467  *
468  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
469  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
470  * in low,high order
471  *
472  * Small structures are passed and returned in registers.  The macro
473  * calling convention can't directly deal with this, so the wrapper
474  * functions must do this.
475  *
476  * These PVOP_* macros are only defined within this header.  This
477  * means that all uses must be wrapped in inline functions.  This also
478  * makes sure the incoming and outgoing types are always correct.
479  */
480 #ifdef CONFIG_X86_32
481 #define PVOP_VCALL_ARGS                         \
482         unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
483 #define PVOP_CALL_ARGS                  PVOP_VCALL_ARGS
484 
485 #define PVOP_CALL_ARG1(x)               "a" ((unsigned long)(x))
486 #define PVOP_CALL_ARG2(x)               "d" ((unsigned long)(x))
487 #define PVOP_CALL_ARG3(x)               "c" ((unsigned long)(x))
488 
489 #define PVOP_VCALL_CLOBBERS             "=a" (__eax), "=d" (__edx),     \
490                                         "=c" (__ecx)
491 #define PVOP_CALL_CLOBBERS              PVOP_VCALL_CLOBBERS
492 
493 #define PVOP_VCALLEE_CLOBBERS           "=a" (__eax), "=d" (__edx)
494 #define PVOP_CALLEE_CLOBBERS            PVOP_VCALLEE_CLOBBERS
495 
496 #define EXTRA_CLOBBERS
497 #define VEXTRA_CLOBBERS
498 #else  /* CONFIG_X86_64 */
499 /* [re]ax isn't an arg, but the return val */
500 #define PVOP_VCALL_ARGS                                 \
501         unsigned long __edi = __edi, __esi = __esi,     \
502                 __edx = __edx, __ecx = __ecx, __eax = __eax
503 #define PVOP_CALL_ARGS          PVOP_VCALL_ARGS
504 
505 #define PVOP_CALL_ARG1(x)               "D" ((unsigned long)(x))
506 #define PVOP_CALL_ARG2(x)               "S" ((unsigned long)(x))
507 #define PVOP_CALL_ARG3(x)               "d" ((unsigned long)(x))
508 #define PVOP_CALL_ARG4(x)               "c" ((unsigned long)(x))
509 
510 #define PVOP_VCALL_CLOBBERS     "=D" (__edi),                           \
511                                 "=S" (__esi), "=d" (__edx),             \
512                                 "=c" (__ecx)
513 #define PVOP_CALL_CLOBBERS      PVOP_VCALL_CLOBBERS, "=a" (__eax)
514 
515 /* void functions are still allowed [re]ax for scratch */
516 #define PVOP_VCALLEE_CLOBBERS   "=a" (__eax)
517 #define PVOP_CALLEE_CLOBBERS    PVOP_VCALLEE_CLOBBERS
518 
519 #define EXTRA_CLOBBERS   , "r8", "r9", "r10", "r11"
520 #define VEXTRA_CLOBBERS  , "rax", "r8", "r9", "r10", "r11"
521 #endif  /* CONFIG_X86_32 */
522 
523 #ifdef CONFIG_PARAVIRT_DEBUG
524 #define PVOP_TEST_NULL(op)      BUG_ON(op == NULL)
525 #else
526 #define PVOP_TEST_NULL(op)      ((void)op)
527 #endif
528 
529 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,         \
530                       pre, post, ...)                                   \
531         ({                                                              \
532                 rettype __ret;                                          \
533                 PVOP_CALL_ARGS;                                         \
534                 PVOP_TEST_NULL(op);                                     \
535                 /* This is 32-bit specific, but is okay in 64-bit */    \
536                 /* since this condition will never hold */              \
537                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
538                         asm volatile(pre                                \
539                                      paravirt_alt(PARAVIRT_CALL)        \
540                                      post                               \
541                                      : call_clbr                        \
542                                      : paravirt_type(op),               \
543                                        paravirt_clobber(clbr),          \
544                                        ##__VA_ARGS__                    \
545                                      : "memory", "cc" extra_clbr);      \
546                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
547                 } else {                                                \
548                         asm volatile(pre                                \
549                                      paravirt_alt(PARAVIRT_CALL)        \
550                                      post                               \
551                                      : call_clbr                        \
552                                      : paravirt_type(op),               \
553                                        paravirt_clobber(clbr),          \
554                                        ##__VA_ARGS__                    \
555                                      : "memory", "cc" extra_clbr);      \
556                         __ret = (rettype)__eax;                         \
557                 }                                                       \
558                 __ret;                                                  \
559         })
560 
561 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
562         ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,        \
563                       EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
564 
565 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)                  \
566         ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
567                       PVOP_CALLEE_CLOBBERS, ,                           \
568                       pre, post, ##__VA_ARGS__)
569 
570 
571 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
572         ({                                                              \
573                 PVOP_VCALL_ARGS;                                        \
574                 PVOP_TEST_NULL(op);                                     \
575                 asm volatile(pre                                        \
576                              paravirt_alt(PARAVIRT_CALL)                \
577                              post                                       \
578                              : call_clbr                                \
579                              : paravirt_type(op),                       \
580                                paravirt_clobber(clbr),                  \
581                                ##__VA_ARGS__                            \
582                              : "memory", "cc" extra_clbr);              \
583         })
584 
585 #define __PVOP_VCALL(op, pre, post, ...)                                \
586         ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,               \
587                        VEXTRA_CLOBBERS,                                 \
588                        pre, post, ##__VA_ARGS__)
589 
590 #define __PVOP_VCALLEESAVE(op, pre, post, ...)                          \
591         ____PVOP_VCALL(op.func, CLBR_RET_REG,                           \
592                       PVOP_VCALLEE_CLOBBERS, ,                          \
593                       pre, post, ##__VA_ARGS__)
594 
595 
596 
597 #define PVOP_CALL0(rettype, op)                                         \
598         __PVOP_CALL(rettype, op, "", "")
599 #define PVOP_VCALL0(op)                                                 \
600         __PVOP_VCALL(op, "", "")
601 
602 #define PVOP_CALLEE0(rettype, op)                                       \
603         __PVOP_CALLEESAVE(rettype, op, "", "")
604 #define PVOP_VCALLEE0(op)                                               \
605         __PVOP_VCALLEESAVE(op, "", "")
606 
607 
608 #define PVOP_CALL1(rettype, op, arg1)                                   \
609         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
610 #define PVOP_VCALL1(op, arg1)                                           \
611         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
612 
613 #define PVOP_CALLEE1(rettype, op, arg1)                                 \
614         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
615 #define PVOP_VCALLEE1(op, arg1)                                         \
616         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
617 
618 
619 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
620         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
621                     PVOP_CALL_ARG2(arg2))
622 #define PVOP_VCALL2(op, arg1, arg2)                                     \
623         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
624                      PVOP_CALL_ARG2(arg2))
625 
626 #define PVOP_CALLEE2(rettype, op, arg1, arg2)                           \
627         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),    \
628                           PVOP_CALL_ARG2(arg2))
629 #define PVOP_VCALLEE2(op, arg1, arg2)                                   \
630         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),            \
631                            PVOP_CALL_ARG2(arg2))
632 
633 
634 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
635         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
636                     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
637 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
638         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
639                      PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
640 
641 /* This is the only difference in x86_64. We can make it much simpler */
642 #ifdef CONFIG_X86_32
643 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
644         __PVOP_CALL(rettype, op,                                        \
645                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
646                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
647                     PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
648 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
649         __PVOP_VCALL(op,                                                \
650                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
651                     "" ((u32)(arg1)), "1" ((u32)(arg2)),               \
652                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
653 #else
654 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
655         __PVOP_CALL(rettype, op, "", "",                                \
656                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
657                     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
658 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
659         __PVOP_VCALL(op, "", "",                                        \
660                      PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),        \
661                      PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
662 #endif
663 
664 /* Lazy mode for batching updates / context switch */
665 enum paravirt_lazy_mode {
666         PARAVIRT_LAZY_NONE,
667         PARAVIRT_LAZY_MMU,
668         PARAVIRT_LAZY_CPU,
669 };
670 
671 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
672 void paravirt_start_context_switch(struct task_struct *prev);
673 void paravirt_end_context_switch(struct task_struct *next);
674 
675 void paravirt_enter_lazy_mmu(void);
676 void paravirt_leave_lazy_mmu(void);
677 void paravirt_flush_lazy_mmu(void);
678 
679 void _paravirt_nop(void);
680 u32 _paravirt_ident_32(u32);
681 u64 _paravirt_ident_64(u64);
682 
683 #define paravirt_nop    ((void *)_paravirt_nop)
684 
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 */
691 };
692 
693 extern struct paravirt_patch_site __parainstructions[],
694         __parainstructions_end[];
695 
696 #endif  /* __ASSEMBLY__ */
697 
698 #endif  /* _ASM_X86_PARAVIRT_TYPES_H */
699 

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