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 (*write_msr)(unsigned int msr, unsigned low, unsigned high); 157 158 u64 (*read_tsc)(void); 159 u64 (*read_pmc)(int counter); 160 unsigned long long (*read_tscp)(unsigned int *aux); 161 162 /* 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.) 167 */ 168 void (*irq_enable_sysexit)(void); 169 170 /* 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. 175 */ 176 void (*usergs_sysret64)(void); 177 178 /* 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 182 * be restored. 183 */ 184 void (*usergs_sysret32)(void); 185 186 /* Normal iret. Jump to this with the standard iret stack 187 frame set up. */ 188 void (*iret)(void); 189 190 void (*swapgs)(void); 191 192 void (*start_context_switch)(struct task_struct *prev); 193 void (*end_context_switch)(struct task_struct *next); 194 }; 195 196 struct pv_irq_ops { 197 /* 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 201 * restore_fl. 202 * 203 * NOTE: These functions callers expect the callee to preserve 204 * more registers than the standard C calling convention. 205 */ 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; 210 211 void (*safe_halt)(void); 212 void (*halt)(void); 213 214 #ifdef CONFIG_X86_64 215 void (*adjust_exception_frame)(void); 216 #endif 217 }; 218 219 struct pv_apic_ops { 220 #ifdef CONFIG_X86_LOCAL_APIC 221 void (*startup_ipi_hook)(int phys_apicid, 222 unsigned long start_eip, 223 unsigned long start_esp); 224 #endif 225 }; 226 227 struct pv_mmu_ops { 228 unsigned long (*read_cr2)(void); 229 void (*write_cr2)(unsigned long); 230 231 unsigned long (*read_cr3)(void); 232 void (*write_cr3)(unsigned long); 233 234 /* 235 * Hooks for intercepting the creation/use/destruction of an 236 * mm_struct. 237 */ 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); 243 244 245 /* TLB operations */ 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, 251 unsigned long start, 252 unsigned long end); 253 254 /* Hooks for allocating and freeing a pagetable top-level */ 255 int (*pgd_alloc)(struct mm_struct *mm); 256 void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd); 257 258 /* 259 * Hooks for allocating/releasing pagetable pages when they're 260 * attached to a pagetable 261 */ 262 void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn); 263 void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn); 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); 268 269 /* 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 (*set_pmd_at)(struct mm_struct *mm, unsigned long addr, 275 pmd_t *pmdp, pmd_t pmdval); 276 void (*pte_update)(struct mm_struct *mm, unsigned long addr, 277 pte_t *ptep); 278 void (*pte_update_defer)(struct mm_struct *mm, 279 unsigned long addr, pte_t *ptep); 280 void (*pmd_update)(struct mm_struct *mm, unsigned long addr, 281 pmd_t *pmdp); 282 void (*pmd_update_defer)(struct mm_struct *mm, 283 unsigned long addr, pmd_t *pmdp); 284 285 pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr, 286 pte_t *ptep); 287 void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr, 288 pte_t *ptep, pte_t pte); 289 290 struct paravirt_callee_save pte_val; 291 struct paravirt_callee_save make_pte; 292 293 struct paravirt_callee_save pgd_val; 294 struct paravirt_callee_save make_pgd; 295 296 #if PAGETABLE_LEVELS >= 3 297 #ifdef CONFIG_X86_PAE 298 void (*set_pte_atomic)(pte_t *ptep, pte_t pteval); 299 void (*pte_clear)(struct mm_struct *mm, unsigned long addr, 300 pte_t *ptep); 301 void (*pmd_clear)(pmd_t *pmdp); 302 303 #endif /* CONFIG_X86_PAE */ 304 305 void (*set_pud)(pud_t *pudp, pud_t pudval); 306 307 struct paravirt_callee_save pmd_val; 308 struct paravirt_callee_save make_pmd; 309 310 #if PAGETABLE_LEVELS == 4 311 struct paravirt_callee_save pud_val; 312 struct paravirt_callee_save make_pud; 313 314 void (*set_pgd)(pgd_t *pudp, pgd_t pgdval); 315 #endif /* PAGETABLE_LEVELS == 4 */ 316 #endif /* PAGETABLE_LEVELS >= 3 */ 317 318 struct pv_lazy_ops lazy_mode; 319 320 /* dom0 ops */ 321 322 /* Sometimes the physical address is a pfn, and sometimes its 323 an mfn. We can tell which is which from the index. */ 324 void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx, 325 phys_addr_t phys, pgprot_t flags); 326 }; 327 328 struct arch_spinlock; 329 struct pv_lock_ops { 330 int (*spin_is_locked)(struct arch_spinlock *lock); 331 int (*spin_is_contended)(struct arch_spinlock *lock); 332 void (*spin_lock)(struct arch_spinlock *lock); 333 void (*spin_lock_flags)(struct arch_spinlock *lock, unsigned long flags); 334 int (*spin_trylock)(struct arch_spinlock *lock); 335 void (*spin_unlock)(struct arch_spinlock *lock); 336 }; 337 338 /* This contains all the paravirt structures: we get a convenient 339 * number for each function using the offset which we use to indicate 340 * what to patch. */ 341 struct paravirt_patch_template { 342 struct pv_init_ops pv_init_ops; 343 struct pv_time_ops pv_time_ops; 344 struct pv_cpu_ops pv_cpu_ops; 345 struct pv_irq_ops pv_irq_ops; 346 struct pv_apic_ops pv_apic_ops; 347 struct pv_mmu_ops pv_mmu_ops; 348 struct pv_lock_ops pv_lock_ops; 349 }; 350 351 extern struct pv_info pv_info; 352 extern struct pv_init_ops pv_init_ops; 353 extern struct pv_time_ops pv_time_ops; 354 extern struct pv_cpu_ops pv_cpu_ops; 355 extern struct pv_irq_ops pv_irq_ops; 356 extern struct pv_apic_ops pv_apic_ops; 357 extern struct pv_mmu_ops pv_mmu_ops; 358 extern struct pv_lock_ops pv_lock_ops; 359 360 #define PARAVIRT_PATCH(x) \ 361 (offsetof(struct paravirt_patch_template, x) / sizeof(void *)) 362 363 #define paravirt_type(op) \ 364 [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \ 365 [paravirt_opptr] "i" (&(op)) 366 #define paravirt_clobber(clobber) \ 367 [paravirt_clobber] "i" (clobber) 368 369 /* 370 * Generate some code, and mark it as patchable by the 371 * apply_paravirt() alternate instruction patcher. 372 */ 373 #define _paravirt_alt(insn_string, type, clobber) \ 374 "771:\n\t" insn_string "\n" "772:\n" \ 375 ".pushsection .parainstructions,\"a\"\n" \ 376 _ASM_ALIGN "\n" \ 377 _ASM_PTR " 771b\n" \ 378 " .byte " type "\n" \ 379 " .byte 772b-771b\n" \ 380 " .short " clobber "\n" \ 381 ".popsection\n" 382 383 /* Generate patchable code, with the default asm parameters. */ 384 #define paravirt_alt(insn_string) \ 385 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]") 386 387 /* Simple instruction patching code. */ 388 #define DEF_NATIVE(ops, name, code) \ 389 extern const char start_##ops##_##name[], end_##ops##_##name[]; \ 390 asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":") 391 392 unsigned paravirt_patch_nop(void); 393 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len); 394 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len); 395 unsigned paravirt_patch_ignore(unsigned len); 396 unsigned paravirt_patch_call(void *insnbuf, 397 const void *target, u16 tgt_clobbers, 398 unsigned long addr, u16 site_clobbers, 399 unsigned len); 400 unsigned paravirt_patch_jmp(void *insnbuf, const void *target, 401 unsigned long addr, unsigned len); 402 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf, 403 unsigned long addr, unsigned len); 404 405 unsigned paravirt_patch_insns(void *insnbuf, unsigned len, 406 const char *start, const char *end); 407 408 unsigned native_patch(u8 type, u16 clobbers, void *ibuf, 409 unsigned long addr, unsigned len); 410 411 int paravirt_disable_iospace(void); 412 413 /* 414 * This generates an indirect call based on the operation type number. 415 * The type number, computed in PARAVIRT_PATCH, is derived from the 416 * offset into the paravirt_patch_template structure, and can therefore be 417 * freely converted back into a structure offset. 418 */ 419 #define PARAVIRT_CALL "call *%c[paravirt_opptr];" 420 421 /* 422 * These macros are intended to wrap calls through one of the paravirt 423 * ops structs, so that they can be later identified and patched at 424 * runtime. 425 * 426 * Normally, a call to a pv_op function is a simple indirect call: 427 * (pv_op_struct.operations)(args...). 428 * 429 * Unfortunately, this is a relatively slow operation for modern CPUs, 430 * because it cannot necessarily determine what the destination 431 * address is. In this case, the address is a runtime constant, so at 432 * the very least we can patch the call to e a simple direct call, or 433 * ideally, patch an inline implementation into the callsite. (Direct 434 * calls are essentially free, because the call and return addresses 435 * are completely predictable.) 436 * 437 * For i386, these macros rely on the standard gcc "regparm(3)" calling 438 * convention, in which the first three arguments are placed in %eax, 439 * %edx, %ecx (in that order), and the remaining arguments are placed 440 * on the stack. All caller-save registers (eax,edx,ecx) are expected 441 * to be modified (either clobbered or used for return values). 442 * X86_64, on the other hand, already specifies a register-based calling 443 * conventions, returning at %rax, with parameteres going on %rdi, %rsi, 444 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any 445 * special handling for dealing with 4 arguments, unlike i386. 446 * However, x86_64 also have to clobber all caller saved registers, which 447 * unfortunately, are quite a bit (r8 - r11) 448 * 449 * The call instruction itself is marked by placing its start address 450 * and size into the .parainstructions section, so that 451 * apply_paravirt() in arch/i386/kernel/alternative.c can do the 452 * appropriate patching under the control of the backend pv_init_ops 453 * implementation. 454 * 455 * Unfortunately there's no way to get gcc to generate the args setup 456 * for the call, and then allow the call itself to be generated by an 457 * inline asm. Because of this, we must do the complete arg setup and 458 * return value handling from within these macros. This is fairly 459 * cumbersome. 460 * 461 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments. 462 * It could be extended to more arguments, but there would be little 463 * to be gained from that. For each number of arguments, there are 464 * the two VCALL and CALL variants for void and non-void functions. 465 * 466 * When there is a return value, the invoker of the macro must specify 467 * the return type. The macro then uses sizeof() on that type to 468 * determine whether its a 32 or 64 bit value, and places the return 469 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for 470 * 64-bit). For x86_64 machines, it just returns at %rax regardless of 471 * the return value size. 472 * 473 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments 474 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments 475 * in low,high order 476 * 477 * Small structures are passed and returned in registers. The macro 478 * calling convention can't directly deal with this, so the wrapper 479 * functions must do this. 480 * 481 * These PVOP_* macros are only defined within this header. This 482 * means that all uses must be wrapped in inline functions. This also 483 * makes sure the incoming and outgoing types are always correct. 484 */ 485 #ifdef CONFIG_X86_32 486 #define PVOP_VCALL_ARGS \ 487 unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx 488 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS 489 490 #define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x)) 491 #define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x)) 492 #define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x)) 493 494 #define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \ 495 "=c" (__ecx) 496 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS 497 498 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx) 499 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS 500 501 #define EXTRA_CLOBBERS 502 #define VEXTRA_CLOBBERS 503 #else /* CONFIG_X86_64 */ 504 /* [re]ax isn't an arg, but the return val */ 505 #define PVOP_VCALL_ARGS \ 506 unsigned long __edi = __edi, __esi = __esi, \ 507 __edx = __edx, __ecx = __ecx, __eax = __eax 508 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS 509 510 #define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x)) 511 #define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x)) 512 #define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x)) 513 #define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x)) 514 515 #define PVOP_VCALL_CLOBBERS "=D" (__edi), \ 516 "=S" (__esi), "=d" (__edx), \ 517 "=c" (__ecx) 518 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax) 519 520 /* void functions are still allowed [re]ax for scratch */ 521 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax) 522 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS 523 524 #define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11" 525 #define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11" 526 #endif /* CONFIG_X86_32 */ 527 528 #ifdef CONFIG_PARAVIRT_DEBUG 529 #define PVOP_TEST_NULL(op) BUG_ON(op == NULL) 530 #else 531 #define PVOP_TEST_NULL(op) ((void)op) 532 #endif 533 534 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \ 535 pre, post, ...) \ 536 ({ \ 537 rettype __ret; \ 538 PVOP_CALL_ARGS; \ 539 PVOP_TEST_NULL(op); \ 540 /* This is 32-bit specific, but is okay in 64-bit */ \ 541 /* since this condition will never hold */ \ 542 if (sizeof(rettype) > sizeof(unsigned long)) { \ 543 asm volatile(pre \ 544 paravirt_alt(PARAVIRT_CALL) \ 545 post \ 546 : call_clbr \ 547 : paravirt_type(op), \ 548 paravirt_clobber(clbr), \ 549 ##__VA_ARGS__ \ 550 : "memory", "cc" extra_clbr); \ 551 __ret = (rettype)((((u64)__edx) << 32) | __eax); \ 552 } else { \ 553 asm volatile(pre \ 554 paravirt_alt(PARAVIRT_CALL) \ 555 post \ 556 : call_clbr \ 557 : paravirt_type(op), \ 558 paravirt_clobber(clbr), \ 559 ##__VA_ARGS__ \ 560 : "memory", "cc" extra_clbr); \ 561 __ret = (rettype)__eax; \ 562 } \ 563 __ret; \ 564 }) 565 566 #define __PVOP_CALL(rettype, op, pre, post, ...) \ 567 ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \ 568 EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__) 569 570 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \ 571 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \ 572 PVOP_CALLEE_CLOBBERS, , \ 573 pre, post, ##__VA_ARGS__) 574 575 576 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \ 577 ({ \ 578 PVOP_VCALL_ARGS; \ 579 PVOP_TEST_NULL(op); \ 580 asm volatile(pre \ 581 paravirt_alt(PARAVIRT_CALL) \ 582 post \ 583 : call_clbr \ 584 : paravirt_type(op), \ 585 paravirt_clobber(clbr), \ 586 ##__VA_ARGS__ \ 587 : "memory", "cc" extra_clbr); \ 588 }) 589 590 #define __PVOP_VCALL(op, pre, post, ...) \ 591 ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \ 592 VEXTRA_CLOBBERS, \ 593 pre, post, ##__VA_ARGS__) 594 595 #define __PVOP_VCALLEESAVE(op, pre, post, ...) \ 596 ____PVOP_VCALL(op.func, CLBR_RET_REG, \ 597 PVOP_VCALLEE_CLOBBERS, , \ 598 pre, post, ##__VA_ARGS__) 599 600 601 602 #define PVOP_CALL0(rettype, op) \ 603 __PVOP_CALL(rettype, op, "", "") 604 #define PVOP_VCALL0(op) \ 605 __PVOP_VCALL(op, "", "") 606 607 #define PVOP_CALLEE0(rettype, op) \ 608 __PVOP_CALLEESAVE(rettype, op, "", "") 609 #define PVOP_VCALLEE0(op) \ 610 __PVOP_VCALLEESAVE(op, "", "") 611 612 613 #define PVOP_CALL1(rettype, op, arg1) \ 614 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1)) 615 #define PVOP_VCALL1(op, arg1) \ 616 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1)) 617 618 #define PVOP_CALLEE1(rettype, op, arg1) \ 619 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1)) 620 #define PVOP_VCALLEE1(op, arg1) \ 621 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1)) 622 623 624 #define PVOP_CALL2(rettype, op, arg1, arg2) \ 625 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \ 626 PVOP_CALL_ARG2(arg2)) 627 #define PVOP_VCALL2(op, arg1, arg2) \ 628 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \ 629 PVOP_CALL_ARG2(arg2)) 630 631 #define PVOP_CALLEE2(rettype, op, arg1, arg2) \ 632 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \ 633 PVOP_CALL_ARG2(arg2)) 634 #define PVOP_VCALLEE2(op, arg1, arg2) \ 635 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \ 636 PVOP_CALL_ARG2(arg2)) 637 638 639 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \ 640 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \ 641 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3)) 642 #define PVOP_VCALL3(op, arg1, arg2, arg3) \ 643 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \ 644 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3)) 645 646 /* This is the only difference in x86_64. We can make it much simpler */ 647 #ifdef CONFIG_X86_32 648 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \ 649 __PVOP_CALL(rettype, op, \ 650 "push %[_arg4];", "lea 4(%%esp),%%esp;", \ 651 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \ 652 PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4))) 653 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \ 654 __PVOP_VCALL(op, \ 655 "push %[_arg4];", "lea 4(%%esp),%%esp;", \ 656 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \ 657 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4))) 658 #else 659 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \ 660 __PVOP_CALL(rettype, op, "", "", \ 661 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \ 662 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4)) 663 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \ 664 __PVOP_VCALL(op, "", "", \ 665 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \ 666 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4)) 667 #endif 668 669 /* Lazy mode for batching updates / context switch */ 670 enum paravirt_lazy_mode { 671 PARAVIRT_LAZY_NONE, 672 PARAVIRT_LAZY_MMU, 673 PARAVIRT_LAZY_CPU, 674 }; 675 676 enum paravirt_lazy_mode paravirt_get_lazy_mode(void); 677 void paravirt_start_context_switch(struct task_struct *prev); 678 void paravirt_end_context_switch(struct task_struct *next); 679 680 void paravirt_enter_lazy_mmu(void); 681 void paravirt_leave_lazy_mmu(void); 682 683 void _paravirt_nop(void); 684 u32 _paravirt_ident_32(u32); 685 u64 _paravirt_ident_64(u64); 686 687 #define paravirt_nop ((void *)_paravirt_nop) 688 689 /* These all sit in the .parainstructions section to tell us what to patch. */ 690 struct paravirt_patch_site { 691 u8 *instr; /* original instructions */ 692 u8 instrtype; /* type of this instruction */ 693 u8 len; /* length of original instruction */ 694 u16 clobbers; /* what registers you may clobber */ 695 }; 696 697 extern struct paravirt_patch_site __parainstructions[], 698 __parainstructions_end[]; 699 700 #endif /* __ASSEMBLY__ */ 701 702 #endif /* _ASM_X86_PARAVIRT_TYPES_H */ 703