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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 #include <asm/pgtable_types.h>
 45 
 46 struct page;
 47 struct thread_struct;
 48 struct desc_ptr;
 49 struct tss_struct;
 50 struct mm_struct;
 51 struct desc_struct;
 52 struct task_struct;
 53 struct cpumask;
 54 
 55 /*
 56  * Wrapper type for pointers to code which uses the non-standard
 57  * calling convention.  See PV_CALL_SAVE_REGS_THUNK below.
 58  */
 59 struct paravirt_callee_save {
 60         void *func;
 61 };
 62 
 63 /* general info */
 64 struct pv_info {
 65         unsigned int kernel_rpl;
 66         int shared_kernel_pmd;
 67 
 68 #ifdef CONFIG_X86_64
 69         u16 extra_user_64bit_cs;  /* __USER_CS if none */
 70 #endif
 71 
 72         int paravirt_enabled;
 73         const char *name;
 74 };
 75 
 76 struct pv_init_ops {
 77         /*
 78          * Patch may replace one of the defined code sequences with
 79          * arbitrary code, subject to the same register constraints.
 80          * This generally means the code is not free to clobber any
 81          * registers other than EAX.  The patch function should return
 82          * the number of bytes of code generated, as we nop pad the
 83          * rest in generic code.
 84          */
 85         unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
 86                           unsigned long addr, unsigned len);
 87 };
 88 
 89 
 90 struct pv_lazy_ops {
 91         /* Set deferred update mode, used for batching operations. */
 92         void (*enter)(void);
 93         void (*leave)(void);
 94 };
 95 
 96 struct pv_time_ops {
 97         unsigned long long (*sched_clock)(void);
 98         unsigned long long (*steal_clock)(int cpu);
 99         unsigned long (*get_tsc_khz)(void);
100 };
101 
102 struct pv_cpu_ops {
103         /* hooks for various privileged instructions */
104         unsigned long (*get_debugreg)(int regno);
105         void (*set_debugreg)(int regno, unsigned long value);
106 
107         void (*clts)(void);
108 
109         unsigned long (*read_cr0)(void);
110         void (*write_cr0)(unsigned long);
111 
112         unsigned long (*read_cr4_safe)(void);
113         unsigned long (*read_cr4)(void);
114         void (*write_cr4)(unsigned long);
115 
116 #ifdef CONFIG_X86_64
117         unsigned long (*read_cr8)(void);
118         void (*write_cr8)(unsigned long);
119 #endif
120 
121         /* Segment descriptor handling */
122         void (*load_tr_desc)(void);
123         void (*load_gdt)(const struct desc_ptr *);
124         void (*load_idt)(const struct desc_ptr *);
125         void (*store_gdt)(struct desc_ptr *);
126         void (*store_idt)(struct desc_ptr *);
127         void (*set_ldt)(const void *desc, unsigned entries);
128         unsigned long (*store_tr)(void);
129         void (*load_tls)(struct thread_struct *t, unsigned int cpu);
130 #ifdef CONFIG_X86_64
131         void (*load_gs_index)(unsigned int idx);
132 #endif
133         void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
134                                 const void *desc);
135         void (*write_gdt_entry)(struct desc_struct *,
136                                 int entrynum, const void *desc, int size);
137         void (*write_idt_entry)(gate_desc *,
138                                 int entrynum, const gate_desc *gate);
139         void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
140         void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
141 
142         void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t);
143 
144         void (*set_iopl_mask)(unsigned mask);
145 
146         void (*wbinvd)(void);
147         void (*io_delay)(void);
148 
149         /* cpuid emulation, mostly so that caps bits can be disabled */
150         void (*cpuid)(unsigned int *eax, unsigned int *ebx,
151                       unsigned int *ecx, unsigned int *edx);
152 
153         /* MSR, PMC and TSR operations.
154            err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */
155         u64 (*read_msr)(unsigned int msr, int *err);
156         int (*rdmsr_regs)(u32 *regs);
157         int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
158         int (*wrmsr_regs)(u32 *regs);
159 
160         u64 (*read_tsc)(void);
161         u64 (*read_pmc)(int counter);
162         unsigned long long (*read_tscp)(unsigned int *aux);
163 
164         /*
165          * Atomically enable interrupts and return to userspace.  This
166          * is only ever used to return to 32-bit processes; in a
167          * 64-bit kernel, it's used for 32-on-64 compat processes, but
168          * never native 64-bit processes.  (Jump, not call.)
169          */
170         void (*irq_enable_sysexit)(void);
171 
172         /*
173          * Switch to usermode gs and return to 64-bit usermode using
174          * sysret.  Only used in 64-bit kernels to return to 64-bit
175          * processes.  Usermode register state, including %rsp, must
176          * already be restored.
177          */
178         void (*usergs_sysret64)(void);
179 
180         /*
181          * Switch to usermode gs and return to 32-bit usermode using
182          * sysret.  Used to return to 32-on-64 compat processes.
183          * Other usermode register state, including %esp, must already
184          * be restored.
185          */
186         void (*usergs_sysret32)(void);
187 
188         /* Normal iret.  Jump to this with the standard iret stack
189            frame set up. */
190         void (*iret)(void);
191 
192         void (*swapgs)(void);
193 
194         void (*start_context_switch)(struct task_struct *prev);
195         void (*end_context_switch)(struct task_struct *next);
196 };
197 
198 struct pv_irq_ops {
199         /*
200          * Get/set interrupt state.  save_fl and restore_fl are only
201          * expected to use X86_EFLAGS_IF; all other bits
202          * returned from save_fl are undefined, and may be ignored by
203          * restore_fl.
204          *
205          * NOTE: These functions callers expect the callee to preserve
206          * more registers than the standard C calling convention.
207          */
208         struct paravirt_callee_save save_fl;
209         struct paravirt_callee_save restore_fl;
210         struct paravirt_callee_save irq_disable;
211         struct paravirt_callee_save irq_enable;
212 
213         void (*safe_halt)(void);
214         void (*halt)(void);
215 
216 #ifdef CONFIG_X86_64
217         void (*adjust_exception_frame)(void);
218 #endif
219 };
220 
221 struct pv_apic_ops {
222 #ifdef CONFIG_X86_LOCAL_APIC
223         void (*startup_ipi_hook)(int phys_apicid,
224                                  unsigned long start_eip,
225                                  unsigned long start_esp);
226 #endif
227 };
228 
229 struct pv_mmu_ops {
230         unsigned long (*read_cr2)(void);
231         void (*write_cr2)(unsigned long);
232 
233         unsigned long (*read_cr3)(void);
234         void (*write_cr3)(unsigned long);
235 
236         /*
237          * Hooks for intercepting the creation/use/destruction of an
238          * mm_struct.
239          */
240         void (*activate_mm)(struct mm_struct *prev,
241                             struct mm_struct *next);
242         void (*dup_mmap)(struct mm_struct *oldmm,
243                          struct mm_struct *mm);
244         void (*exit_mmap)(struct mm_struct *mm);
245 
246 
247         /* TLB operations */
248         void (*flush_tlb_user)(void);
249         void (*flush_tlb_kernel)(void);
250         void (*flush_tlb_single)(unsigned long addr);
251         void (*flush_tlb_others)(const struct cpumask *cpus,
252                                  struct mm_struct *mm,
253                                  unsigned long va);
254 
255         /* Hooks for allocating and freeing a pagetable top-level */
256         int  (*pgd_alloc)(struct mm_struct *mm);
257         void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
258 
259         /*
260          * Hooks for allocating/releasing pagetable pages when they're
261          * attached to a pagetable
262          */
263         void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
264         void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
265         void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
266         void (*release_pte)(unsigned long pfn);
267         void (*release_pmd)(unsigned long pfn);
268         void (*release_pud)(unsigned long pfn);
269 
270         /* Pagetable manipulation functions */
271         void (*set_pte)(pte_t *ptep, pte_t pteval);
272         void (*set_pte_at)(struct mm_struct *mm, unsigned long addr,
273                            pte_t *ptep, pte_t pteval);
274         void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
275         void (*set_pmd_at)(struct mm_struct *mm, unsigned long addr,
276                            pmd_t *pmdp, pmd_t pmdval);
277         void (*pte_update)(struct mm_struct *mm, unsigned long addr,
278                            pte_t *ptep);
279         void (*pte_update_defer)(struct mm_struct *mm,
280                                  unsigned long addr, pte_t *ptep);
281         void (*pmd_update)(struct mm_struct *mm, unsigned long addr,
282                            pmd_t *pmdp);
283         void (*pmd_update_defer)(struct mm_struct *mm,
284                                  unsigned long addr, pmd_t *pmdp);
285 
286         pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
287                                         pte_t *ptep);
288         void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
289                                         pte_t *ptep, pte_t pte);
290 
291         struct paravirt_callee_save pte_val;
292         struct paravirt_callee_save make_pte;
293 
294         struct paravirt_callee_save pgd_val;
295         struct paravirt_callee_save make_pgd;
296 
297 #if PAGETABLE_LEVELS >= 3
298 #ifdef CONFIG_X86_PAE
299         void (*set_pte_atomic)(pte_t *ptep, pte_t pteval);
300         void (*pte_clear)(struct mm_struct *mm, unsigned long addr,
301                           pte_t *ptep);
302         void (*pmd_clear)(pmd_t *pmdp);
303 
304 #endif  /* CONFIG_X86_PAE */
305 
306         void (*set_pud)(pud_t *pudp, pud_t pudval);
307 
308         struct paravirt_callee_save pmd_val;
309         struct paravirt_callee_save make_pmd;
310 
311 #if PAGETABLE_LEVELS == 4
312         struct paravirt_callee_save pud_val;
313         struct paravirt_callee_save make_pud;
314 
315         void (*set_pgd)(pgd_t *pudp, pgd_t pgdval);
316 #endif  /* PAGETABLE_LEVELS == 4 */
317 #endif  /* PAGETABLE_LEVELS >= 3 */
318 
319         struct pv_lazy_ops lazy_mode;
320 
321         /* dom0 ops */
322 
323         /* Sometimes the physical address is a pfn, and sometimes its
324            an mfn.  We can tell which is which from the index. */
325         void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
326                            phys_addr_t phys, pgprot_t flags);
327 };
328 
329 struct arch_spinlock;
330 struct pv_lock_ops {
331         int (*spin_is_locked)(struct arch_spinlock *lock);
332         int (*spin_is_contended)(struct arch_spinlock *lock);
333         void (*spin_lock)(struct arch_spinlock *lock);
334         void (*spin_lock_flags)(struct arch_spinlock *lock, unsigned long flags);
335         int (*spin_trylock)(struct arch_spinlock *lock);
336         void (*spin_unlock)(struct arch_spinlock *lock);
337 };
338 
339 /* This contains all the paravirt structures: we get a convenient
340  * number for each function using the offset which we use to indicate
341  * what to patch. */
342 struct paravirt_patch_template {
343         struct pv_init_ops pv_init_ops;
344         struct pv_time_ops pv_time_ops;
345         struct pv_cpu_ops pv_cpu_ops;
346         struct pv_irq_ops pv_irq_ops;
347         struct pv_apic_ops pv_apic_ops;
348         struct pv_mmu_ops pv_mmu_ops;
349         struct pv_lock_ops pv_lock_ops;
350 };
351 
352 extern struct pv_info pv_info;
353 extern struct pv_init_ops pv_init_ops;
354 extern struct pv_time_ops pv_time_ops;
355 extern struct pv_cpu_ops pv_cpu_ops;
356 extern struct pv_irq_ops pv_irq_ops;
357 extern struct pv_apic_ops pv_apic_ops;
358 extern struct pv_mmu_ops pv_mmu_ops;
359 extern struct pv_lock_ops pv_lock_ops;
360 
361 #define PARAVIRT_PATCH(x)                                       \
362         (offsetof(struct paravirt_patch_template, x) / sizeof(void *))
363 
364 #define paravirt_type(op)                               \
365         [paravirt_typenum] "i" (PARAVIRT_PATCH(op)),    \
366         [paravirt_opptr] "i" (&(op))
367 #define paravirt_clobber(clobber)               \
368         [paravirt_clobber] "i" (clobber)
369 
370 /*
371  * Generate some code, and mark it as patchable by the
372  * apply_paravirt() alternate instruction patcher.
373  */
374 #define _paravirt_alt(insn_string, type, clobber)       \
375         "771:\n\t" insn_string "\n" "772:\n"            \
376         ".pushsection .parainstructions,\"a\"\n"        \
377         _ASM_ALIGN "\n"                                 \
378         _ASM_PTR " 771b\n"                              \
379         "  .byte " type "\n"                            \
380         "  .byte 772b-771b\n"                           \
381         "  .short " clobber "\n"                        \
382         ".popsection\n"
383 
384 /* Generate patchable code, with the default asm parameters. */
385 #define paravirt_alt(insn_string)                                       \
386         _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
387 
388 /* Simple instruction patching code. */
389 #define DEF_NATIVE(ops, name, code)                                     \
390         extern const char start_##ops##_##name[], end_##ops##_##name[]; \
391         asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
392 
393 unsigned paravirt_patch_nop(void);
394 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
395 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
396 unsigned paravirt_patch_ignore(unsigned len);
397 unsigned paravirt_patch_call(void *insnbuf,
398                              const void *target, u16 tgt_clobbers,
399                              unsigned long addr, u16 site_clobbers,
400                              unsigned len);
401 unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
402                             unsigned long addr, unsigned len);
403 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
404                                 unsigned long addr, unsigned len);
405 
406 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
407                               const char *start, const char *end);
408 
409 unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
410                       unsigned long addr, unsigned len);
411 
412 int paravirt_disable_iospace(void);
413 
414 /*
415  * This generates an indirect call based on the operation type number.
416  * The type number, computed in PARAVIRT_PATCH, is derived from the
417  * offset into the paravirt_patch_template structure, and can therefore be
418  * freely converted back into a structure offset.
419  */
420 #define PARAVIRT_CALL   "call *%c[paravirt_opptr];"
421 
422 /*
423  * These macros are intended to wrap calls through one of the paravirt
424  * ops structs, so that they can be later identified and patched at
425  * runtime.
426  *
427  * Normally, a call to a pv_op function is a simple indirect call:
428  * (pv_op_struct.operations)(args...).
429  *
430  * Unfortunately, this is a relatively slow operation for modern CPUs,
431  * because it cannot necessarily determine what the destination
432  * address is.  In this case, the address is a runtime constant, so at
433  * the very least we can patch the call to e a simple direct call, or
434  * ideally, patch an inline implementation into the callsite.  (Direct
435  * calls are essentially free, because the call and return addresses
436  * are completely predictable.)
437  *
438  * For i386, these macros rely on the standard gcc "regparm(3)" calling
439  * convention, in which the first three arguments are placed in %eax,
440  * %edx, %ecx (in that order), and the remaining arguments are placed
441  * on the stack.  All caller-save registers (eax,edx,ecx) are expected
442  * to be modified (either clobbered or used for return values).
443  * X86_64, on the other hand, already specifies a register-based calling
444  * conventions, returning at %rax, with parameteres going on %rdi, %rsi,
445  * %rdx, and %rcx. Note that for this reason, x86_64 does not need any
446  * special handling for dealing with 4 arguments, unlike i386.
447  * However, x86_64 also have to clobber all caller saved registers, which
448  * unfortunately, are quite a bit (r8 - r11)
449  *
450  * The call instruction itself is marked by placing its start address
451  * and size into the .parainstructions section, so that
452  * apply_paravirt() in arch/i386/kernel/alternative.c can do the
453  * appropriate patching under the control of the backend pv_init_ops
454  * implementation.
455  *
456  * Unfortunately there's no way to get gcc to generate the args setup
457  * for the call, and then allow the call itself to be generated by an
458  * inline asm.  Because of this, we must do the complete arg setup and
459  * return value handling from within these macros.  This is fairly
460  * cumbersome.
461  *
462  * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
463  * It could be extended to more arguments, but there would be little
464  * to be gained from that.  For each number of arguments, there are
465  * the two VCALL and CALL variants for void and non-void functions.
466  *
467  * When there is a return value, the invoker of the macro must specify
468  * the return type.  The macro then uses sizeof() on that type to
469  * determine whether its a 32 or 64 bit value, and places the return
470  * in the right register(s) (just %eax for 32-bit, and %edx:%eax for
471  * 64-bit). For x86_64 machines, it just returns at %rax regardless of
472  * the return value size.
473  *
474  * 64-bit arguments are passed as a pair of adjacent 32-bit arguments
475  * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
476  * in low,high order
477  *
478  * Small structures are passed and returned in registers.  The macro
479  * calling convention can't directly deal with this, so the wrapper
480  * functions must do this.
481  *
482  * These PVOP_* macros are only defined within this header.  This
483  * means that all uses must be wrapped in inline functions.  This also
484  * makes sure the incoming and outgoing types are always correct.
485  */
486 #ifdef CONFIG_X86_32
487 #define PVOP_VCALL_ARGS                         \
488         unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx
489 #define PVOP_CALL_ARGS                  PVOP_VCALL_ARGS
490 
491 #define PVOP_CALL_ARG1(x)               "a" ((unsigned long)(x))
492 #define PVOP_CALL_ARG2(x)               "d" ((unsigned long)(x))
493 #define PVOP_CALL_ARG3(x)               "c" ((unsigned long)(x))
494 
495 #define PVOP_VCALL_CLOBBERS             "=a" (__eax), "=d" (__edx),     \
496                                         "=c" (__ecx)
497 #define PVOP_CALL_CLOBBERS              PVOP_VCALL_CLOBBERS
498 
499 #define PVOP_VCALLEE_CLOBBERS           "=a" (__eax), "=d" (__edx)
500 #define PVOP_CALLEE_CLOBBERS            PVOP_VCALLEE_CLOBBERS
501 
502 #define EXTRA_CLOBBERS
503 #define VEXTRA_CLOBBERS
504 #else  /* CONFIG_X86_64 */
505 /* [re]ax isn't an arg, but the return val */
506 #define PVOP_VCALL_ARGS                                 \
507         unsigned long __edi = __edi, __esi = __esi,     \
508                 __edx = __edx, __ecx = __ecx, __eax = __eax
509 #define PVOP_CALL_ARGS          PVOP_VCALL_ARGS
510 
511 #define PVOP_CALL_ARG1(x)               "D" ((unsigned long)(x))
512 #define PVOP_CALL_ARG2(x)               "S" ((unsigned long)(x))
513 #define PVOP_CALL_ARG3(x)               "d" ((unsigned long)(x))
514 #define PVOP_CALL_ARG4(x)               "c" ((unsigned long)(x))
515 
516 #define PVOP_VCALL_CLOBBERS     "=D" (__edi),                           \
517                                 "=S" (__esi), "=d" (__edx),             \
518                                 "=c" (__ecx)
519 #define PVOP_CALL_CLOBBERS      PVOP_VCALL_CLOBBERS, "=a" (__eax)
520 
521 /* void functions are still allowed [re]ax for scratch */
522 #define PVOP_VCALLEE_CLOBBERS   "=a" (__eax)
523 #define PVOP_CALLEE_CLOBBERS    PVOP_VCALLEE_CLOBBERS
524 
525 #define EXTRA_CLOBBERS   , "r8", "r9", "r10", "r11"
526 #define VEXTRA_CLOBBERS  , "rax", "r8", "r9", "r10", "r11"
527 #endif  /* CONFIG_X86_32 */
528 
529 #ifdef CONFIG_PARAVIRT_DEBUG
530 #define PVOP_TEST_NULL(op)      BUG_ON(op == NULL)
531 #else
532 #define PVOP_TEST_NULL(op)      ((void)op)
533 #endif
534 
535 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr,         \
536                       pre, post, ...)                                   \
537         ({                                                              \
538                 rettype __ret;                                          \
539                 PVOP_CALL_ARGS;                                         \
540                 PVOP_TEST_NULL(op);                                     \
541                 /* This is 32-bit specific, but is okay in 64-bit */    \
542                 /* since this condition will never hold */              \
543                 if (sizeof(rettype) > sizeof(unsigned long)) {          \
544                         asm volatile(pre                                \
545                                      paravirt_alt(PARAVIRT_CALL)        \
546                                      post                               \
547                                      : call_clbr                        \
548                                      : paravirt_type(op),               \
549                                        paravirt_clobber(clbr),          \
550                                        ##__VA_ARGS__                    \
551                                      : "memory", "cc" extra_clbr);      \
552                         __ret = (rettype)((((u64)__edx) << 32) | __eax); \
553                 } else {                                                \
554                         asm volatile(pre                                \
555                                      paravirt_alt(PARAVIRT_CALL)        \
556                                      post                               \
557                                      : call_clbr                        \
558                                      : paravirt_type(op),               \
559                                        paravirt_clobber(clbr),          \
560                                        ##__VA_ARGS__                    \
561                                      : "memory", "cc" extra_clbr);      \
562                         __ret = (rettype)__eax;                         \
563                 }                                                       \
564                 __ret;                                                  \
565         })
566 
567 #define __PVOP_CALL(rettype, op, pre, post, ...)                        \
568         ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS,        \
569                       EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__)
570 
571 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...)                  \
572         ____PVOP_CALL(rettype, op.func, CLBR_RET_REG,                   \
573                       PVOP_CALLEE_CLOBBERS, ,                           \
574                       pre, post, ##__VA_ARGS__)
575 
576 
577 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \
578         ({                                                              \
579                 PVOP_VCALL_ARGS;                                        \
580                 PVOP_TEST_NULL(op);                                     \
581                 asm volatile(pre                                        \
582                              paravirt_alt(PARAVIRT_CALL)                \
583                              post                                       \
584                              : call_clbr                                \
585                              : paravirt_type(op),                       \
586                                paravirt_clobber(clbr),                  \
587                                ##__VA_ARGS__                            \
588                              : "memory", "cc" extra_clbr);              \
589         })
590 
591 #define __PVOP_VCALL(op, pre, post, ...)                                \
592         ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS,               \
593                        VEXTRA_CLOBBERS,                                 \
594                        pre, post, ##__VA_ARGS__)
595 
596 #define __PVOP_VCALLEESAVE(op, pre, post, ...)                          \
597         ____PVOP_VCALL(op.func, CLBR_RET_REG,                           \
598                       PVOP_VCALLEE_CLOBBERS, ,                          \
599                       pre, post, ##__VA_ARGS__)
600 
601 
602 
603 #define PVOP_CALL0(rettype, op)                                         \
604         __PVOP_CALL(rettype, op, "", "")
605 #define PVOP_VCALL0(op)                                                 \
606         __PVOP_VCALL(op, "", "")
607 
608 #define PVOP_CALLEE0(rettype, op)                                       \
609         __PVOP_CALLEESAVE(rettype, op, "", "")
610 #define PVOP_VCALLEE0(op)                                               \
611         __PVOP_VCALLEESAVE(op, "", "")
612 
613 
614 #define PVOP_CALL1(rettype, op, arg1)                                   \
615         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
616 #define PVOP_VCALL1(op, arg1)                                           \
617         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1))
618 
619 #define PVOP_CALLEE1(rettype, op, arg1)                                 \
620         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1))
621 #define PVOP_VCALLEE1(op, arg1)                                         \
622         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1))
623 
624 
625 #define PVOP_CALL2(rettype, op, arg1, arg2)                             \
626         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
627                     PVOP_CALL_ARG2(arg2))
628 #define PVOP_VCALL2(op, arg1, arg2)                                     \
629         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
630                      PVOP_CALL_ARG2(arg2))
631 
632 #define PVOP_CALLEE2(rettype, op, arg1, arg2)                           \
633         __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1),    \
634                           PVOP_CALL_ARG2(arg2))
635 #define PVOP_VCALLEE2(op, arg1, arg2)                                   \
636         __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1),            \
637                            PVOP_CALL_ARG2(arg2))
638 
639 
640 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3)                       \
641         __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1),          \
642                     PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
643 #define PVOP_VCALL3(op, arg1, arg2, arg3)                               \
644         __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1),                  \
645                      PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
646 
647 /* This is the only difference in x86_64. We can make it much simpler */
648 #ifdef CONFIG_X86_32
649 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
650         __PVOP_CALL(rettype, op,                                        \
651                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
652                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
653                     PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4)))
654 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
655         __PVOP_VCALL(op,                                                \
656                     "push %[_arg4];", "lea 4(%%esp),%%esp;",            \
657                     "" ((u32)(arg1)), "1" ((u32)(arg2)),               \
658                     "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
659 #else
660 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)                 \
661         __PVOP_CALL(rettype, op, "", "",                                \
662                     PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),         \
663                     PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
664 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)                         \
665         __PVOP_VCALL(op, "", "",                                        \
666                      PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2),        \
667                      PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
668 #endif
669 
670 /* Lazy mode for batching updates / context switch */
671 enum paravirt_lazy_mode {
672         PARAVIRT_LAZY_NONE,
673         PARAVIRT_LAZY_MMU,
674         PARAVIRT_LAZY_CPU,
675 };
676 
677 enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
678 void paravirt_start_context_switch(struct task_struct *prev);
679 void paravirt_end_context_switch(struct task_struct *next);
680 
681 void paravirt_enter_lazy_mmu(void);
682 void paravirt_leave_lazy_mmu(void);
683 
684 void _paravirt_nop(void);
685 u32 _paravirt_ident_32(u32);
686 u64 _paravirt_ident_64(u64);
687 
688 #define paravirt_nop    ((void *)_paravirt_nop)
689 
690 /* These all sit in the .parainstructions section to tell us what to patch. */
691 struct paravirt_patch_site {
692         u8 *instr;              /* original instructions */
693         u8 instrtype;           /* type of this instruction */
694         u8 len;                 /* length of original instruction */
695         u16 clobbers;           /* what registers you may clobber */
696 };
697 
698 extern struct paravirt_patch_site __parainstructions[],
699         __parainstructions_end[];
700 
701 #endif  /* __ASSEMBLY__ */
702 
703 #endif  /* _ASM_X86_PARAVIRT_TYPES_H */
704 

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