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 void (*flush)(void); 95 }; 96 97 struct pv_time_ops { 98 unsigned long long (*sched_clock)(void); 99 unsigned long long (*steal_clock)(int cpu); 100 unsigned long (*get_tsc_khz)(void); 101 }; 102 103 struct pv_cpu_ops { 104 /* hooks for various privileged instructions */ 105 unsigned long (*get_debugreg)(int regno); 106 void (*set_debugreg)(int regno, unsigned long value); 107 108 void (*clts)(void); 109 110 unsigned long (*read_cr0)(void); 111 void (*write_cr0)(unsigned long); 112 113 unsigned long (*read_cr4_safe)(void); 114 unsigned long (*read_cr4)(void); 115 void (*write_cr4)(unsigned long); 116 117 #ifdef CONFIG_X86_64 118 unsigned long (*read_cr8)(void); 119 void (*write_cr8)(unsigned long); 120 #endif 121 122 /* Segment descriptor handling */ 123 void (*load_tr_desc)(void); 124 void (*load_gdt)(const struct desc_ptr *); 125 void (*load_idt)(const struct desc_ptr *); 126 /* store_gdt has been removed. */ 127 void (*store_idt)(struct desc_ptr *); 128 void (*set_ldt)(const void *desc, unsigned entries); 129 unsigned long (*store_tr)(void); 130 void (*load_tls)(struct thread_struct *t, unsigned int cpu); 131 #ifdef CONFIG_X86_64 132 void (*load_gs_index)(unsigned int idx); 133 #endif 134 void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum, 135 const void *desc); 136 void (*write_gdt_entry)(struct desc_struct *, 137 int entrynum, const void *desc, int size); 138 void (*write_idt_entry)(gate_desc *, 139 int entrynum, const gate_desc *gate); 140 void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries); 141 void (*free_ldt)(struct desc_struct *ldt, unsigned entries); 142 143 void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t); 144 145 void (*set_iopl_mask)(unsigned mask); 146 147 void (*wbinvd)(void); 148 void (*io_delay)(void); 149 150 /* cpuid emulation, mostly so that caps bits can be disabled */ 151 void (*cpuid)(unsigned int *eax, unsigned int *ebx, 152 unsigned int *ecx, unsigned int *edx); 153 154 /* MSR, PMC and TSR operations. 155 err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */ 156 u64 (*read_msr)(unsigned int msr, int *err); 157 int (*write_msr)(unsigned int msr, unsigned low, unsigned high); 158 159 u64 (*read_tsc)(void); 160 u64 (*read_pmc)(int counter); 161 unsigned long long (*read_tscp)(unsigned int *aux); 162 163 /* 164 * Atomically enable interrupts and return to userspace. This 165 * is only ever used to return to 32-bit processes; in a 166 * 64-bit kernel, it's used for 32-on-64 compat processes, but 167 * never native 64-bit processes. (Jump, not call.) 168 */ 169 void (*irq_enable_sysexit)(void); 170 171 /* 172 * Switch to usermode gs and return to 64-bit usermode using 173 * sysret. Only used in 64-bit kernels to return to 64-bit 174 * processes. Usermode register state, including %rsp, must 175 * already be restored. 176 */ 177 void (*usergs_sysret64)(void); 178 179 /* 180 * Switch to usermode gs and return to 32-bit usermode using 181 * sysret. Used to return to 32-on-64 compat processes. 182 * Other usermode register state, including %esp, must already 183 * be restored. 184 */ 185 void (*usergs_sysret32)(void); 186 187 /* Normal iret. Jump to this with the standard iret stack 188 frame set up. */ 189 void (*iret)(void); 190 191 void (*swapgs)(void); 192 193 void (*start_context_switch)(struct task_struct *prev); 194 void (*end_context_switch)(struct task_struct *next); 195 }; 196 197 struct pv_irq_ops { 198 /* 199 * Get/set interrupt state. save_fl and restore_fl are only 200 * expected to use X86_EFLAGS_IF; all other bits 201 * returned from save_fl are undefined, and may be ignored by 202 * restore_fl. 203 * 204 * NOTE: These functions callers expect the callee to preserve 205 * more registers than the standard C calling convention. 206 */ 207 struct paravirt_callee_save save_fl; 208 struct paravirt_callee_save restore_fl; 209 struct paravirt_callee_save irq_disable; 210 struct paravirt_callee_save irq_enable; 211 212 void (*safe_halt)(void); 213 void (*halt)(void); 214 215 #ifdef CONFIG_X86_64 216 void (*adjust_exception_frame)(void); 217 #endif 218 }; 219 220 struct pv_apic_ops { 221 #ifdef CONFIG_X86_LOCAL_APIC 222 void (*startup_ipi_hook)(int phys_apicid, 223 unsigned long start_eip, 224 unsigned long start_esp); 225 #endif 226 }; 227 228 struct pv_mmu_ops { 229 unsigned long (*read_cr2)(void); 230 void (*write_cr2)(unsigned long); 231 232 unsigned long (*read_cr3)(void); 233 void (*write_cr3)(unsigned long); 234 235 /* 236 * Hooks for intercepting the creation/use/destruction of an 237 * mm_struct. 238 */ 239 void (*activate_mm)(struct mm_struct *prev, 240 struct mm_struct *next); 241 void (*dup_mmap)(struct mm_struct *oldmm, 242 struct mm_struct *mm); 243 void (*exit_mmap)(struct mm_struct *mm); 244 245 246 /* TLB operations */ 247 void (*flush_tlb_user)(void); 248 void (*flush_tlb_kernel)(void); 249 void (*flush_tlb_single)(unsigned long addr); 250 void (*flush_tlb_others)(const struct cpumask *cpus, 251 struct mm_struct *mm, 252 unsigned long start, 253 unsigned long end); 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 "0" ((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 void paravirt_flush_lazy_mmu(void); 684 685 void _paravirt_nop(void); 686 u32 _paravirt_ident_32(u32); 687 u64 _paravirt_ident_64(u64); 688 689 #define paravirt_nop ((void *)_paravirt_nop) 690 691 /* These all sit in the .parainstructions section to tell us what to patch. */ 692 struct paravirt_patch_site { 693 u8 *instr; /* original instructions */ 694 u8 instrtype; /* type of this instruction */ 695 u8 len; /* length of original instruction */ 696 u16 clobbers; /* what registers you may clobber */ 697 }; 698 699 extern struct paravirt_patch_site __parainstructions[], 700 __parainstructions_end[]; 701 702 #endif /* __ASSEMBLY__ */ 703 704 #endif /* _ASM_X86_PARAVIRT_TYPES_H */ 705