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 #ifdef CONFIG_SMP 331 #include <asm/spinlock_types.h> 332 #else 333 typedef u16 __ticket_t; 334 #endif 335 336 struct pv_lock_ops { 337 struct paravirt_callee_save lock_spinning; 338 void (*unlock_kick)(struct arch_spinlock *lock, __ticket_t ticket); 339 }; 340 341 /* This contains all the paravirt structures: we get a convenient 342 * number for each function using the offset which we use to indicate 343 * what to patch. */ 344 struct paravirt_patch_template { 345 struct pv_init_ops pv_init_ops; 346 struct pv_time_ops pv_time_ops; 347 struct pv_cpu_ops pv_cpu_ops; 348 struct pv_irq_ops pv_irq_ops; 349 struct pv_apic_ops pv_apic_ops; 350 struct pv_mmu_ops pv_mmu_ops; 351 struct pv_lock_ops pv_lock_ops; 352 }; 353 354 extern struct pv_info pv_info; 355 extern struct pv_init_ops pv_init_ops; 356 extern struct pv_time_ops pv_time_ops; 357 extern struct pv_cpu_ops pv_cpu_ops; 358 extern struct pv_irq_ops pv_irq_ops; 359 extern struct pv_apic_ops pv_apic_ops; 360 extern struct pv_mmu_ops pv_mmu_ops; 361 extern struct pv_lock_ops pv_lock_ops; 362 363 #define PARAVIRT_PATCH(x) \ 364 (offsetof(struct paravirt_patch_template, x) / sizeof(void *)) 365 366 #define paravirt_type(op) \ 367 [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \ 368 [paravirt_opptr] "i" (&(op)) 369 #define paravirt_clobber(clobber) \ 370 [paravirt_clobber] "i" (clobber) 371 372 /* 373 * Generate some code, and mark it as patchable by the 374 * apply_paravirt() alternate instruction patcher. 375 */ 376 #define _paravirt_alt(insn_string, type, clobber) \ 377 "771:\n\t" insn_string "\n" "772:\n" \ 378 ".pushsection .parainstructions,\"a\"\n" \ 379 _ASM_ALIGN "\n" \ 380 _ASM_PTR " 771b\n" \ 381 " .byte " type "\n" \ 382 " .byte 772b-771b\n" \ 383 " .short " clobber "\n" \ 384 ".popsection\n" 385 386 /* Generate patchable code, with the default asm parameters. */ 387 #define paravirt_alt(insn_string) \ 388 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]") 389 390 /* Simple instruction patching code. */ 391 #define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t" 392 393 #define DEF_NATIVE(ops, name, code) \ 394 __visible extern const char start_##ops##_##name[], end_##ops##_##name[]; \ 395 asm(NATIVE_LABEL("start_", ops, name) code NATIVE_LABEL("end_", ops, name)) 396 397 unsigned paravirt_patch_nop(void); 398 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len); 399 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len); 400 unsigned paravirt_patch_ignore(unsigned len); 401 unsigned paravirt_patch_call(void *insnbuf, 402 const void *target, u16 tgt_clobbers, 403 unsigned long addr, u16 site_clobbers, 404 unsigned len); 405 unsigned paravirt_patch_jmp(void *insnbuf, const void *target, 406 unsigned long addr, unsigned len); 407 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf, 408 unsigned long addr, unsigned len); 409 410 unsigned paravirt_patch_insns(void *insnbuf, unsigned len, 411 const char *start, const char *end); 412 413 unsigned native_patch(u8 type, u16 clobbers, void *ibuf, 414 unsigned long addr, unsigned len); 415 416 int paravirt_disable_iospace(void); 417 418 /* 419 * This generates an indirect call based on the operation type number. 420 * The type number, computed in PARAVIRT_PATCH, is derived from the 421 * offset into the paravirt_patch_template structure, and can therefore be 422 * freely converted back into a structure offset. 423 */ 424 #define PARAVIRT_CALL "call *%c[paravirt_opptr];" 425 426 /* 427 * These macros are intended to wrap calls through one of the paravirt 428 * ops structs, so that they can be later identified and patched at 429 * runtime. 430 * 431 * Normally, a call to a pv_op function is a simple indirect call: 432 * (pv_op_struct.operations)(args...). 433 * 434 * Unfortunately, this is a relatively slow operation for modern CPUs, 435 * because it cannot necessarily determine what the destination 436 * address is. In this case, the address is a runtime constant, so at 437 * the very least we can patch the call to e a simple direct call, or 438 * ideally, patch an inline implementation into the callsite. (Direct 439 * calls are essentially free, because the call and return addresses 440 * are completely predictable.) 441 * 442 * For i386, these macros rely on the standard gcc "regparm(3)" calling 443 * convention, in which the first three arguments are placed in %eax, 444 * %edx, %ecx (in that order), and the remaining arguments are placed 445 * on the stack. All caller-save registers (eax,edx,ecx) are expected 446 * to be modified (either clobbered or used for return values). 447 * X86_64, on the other hand, already specifies a register-based calling 448 * conventions, returning at %rax, with parameteres going on %rdi, %rsi, 449 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any 450 * special handling for dealing with 4 arguments, unlike i386. 451 * However, x86_64 also have to clobber all caller saved registers, which 452 * unfortunately, are quite a bit (r8 - r11) 453 * 454 * The call instruction itself is marked by placing its start address 455 * and size into the .parainstructions section, so that 456 * apply_paravirt() in arch/i386/kernel/alternative.c can do the 457 * appropriate patching under the control of the backend pv_init_ops 458 * implementation. 459 * 460 * Unfortunately there's no way to get gcc to generate the args setup 461 * for the call, and then allow the call itself to be generated by an 462 * inline asm. Because of this, we must do the complete arg setup and 463 * return value handling from within these macros. This is fairly 464 * cumbersome. 465 * 466 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments. 467 * It could be extended to more arguments, but there would be little 468 * to be gained from that. For each number of arguments, there are 469 * the two VCALL and CALL variants for void and non-void functions. 470 * 471 * When there is a return value, the invoker of the macro must specify 472 * the return type. The macro then uses sizeof() on that type to 473 * determine whether its a 32 or 64 bit value, and places the return 474 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for 475 * 64-bit). For x86_64 machines, it just returns at %rax regardless of 476 * the return value size. 477 * 478 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments 479 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments 480 * in low,high order 481 * 482 * Small structures are passed and returned in registers. The macro 483 * calling convention can't directly deal with this, so the wrapper 484 * functions must do this. 485 * 486 * These PVOP_* macros are only defined within this header. This 487 * means that all uses must be wrapped in inline functions. This also 488 * makes sure the incoming and outgoing types are always correct. 489 */ 490 #ifdef CONFIG_X86_32 491 #define PVOP_VCALL_ARGS \ 492 unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx 493 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS 494 495 #define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x)) 496 #define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x)) 497 #define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x)) 498 499 #define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \ 500 "=c" (__ecx) 501 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS 502 503 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx) 504 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS 505 506 #define EXTRA_CLOBBERS 507 #define VEXTRA_CLOBBERS 508 #else /* CONFIG_X86_64 */ 509 /* [re]ax isn't an arg, but the return val */ 510 #define PVOP_VCALL_ARGS \ 511 unsigned long __edi = __edi, __esi = __esi, \ 512 __edx = __edx, __ecx = __ecx, __eax = __eax 513 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS 514 515 #define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x)) 516 #define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x)) 517 #define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x)) 518 #define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x)) 519 520 #define PVOP_VCALL_CLOBBERS "=D" (__edi), \ 521 "=S" (__esi), "=d" (__edx), \ 522 "=c" (__ecx) 523 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax) 524 525 /* void functions are still allowed [re]ax for scratch */ 526 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax) 527 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS 528 529 #define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11" 530 #define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11" 531 #endif /* CONFIG_X86_32 */ 532 533 #ifdef CONFIG_PARAVIRT_DEBUG 534 #define PVOP_TEST_NULL(op) BUG_ON(op == NULL) 535 #else 536 #define PVOP_TEST_NULL(op) ((void)op) 537 #endif 538 539 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \ 540 pre, post, ...) \ 541 ({ \ 542 rettype __ret; \ 543 PVOP_CALL_ARGS; \ 544 PVOP_TEST_NULL(op); \ 545 /* This is 32-bit specific, but is okay in 64-bit */ \ 546 /* since this condition will never hold */ \ 547 if (sizeof(rettype) > sizeof(unsigned long)) { \ 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)((((u64)__edx) << 32) | __eax); \ 557 } else { \ 558 asm volatile(pre \ 559 paravirt_alt(PARAVIRT_CALL) \ 560 post \ 561 : call_clbr \ 562 : paravirt_type(op), \ 563 paravirt_clobber(clbr), \ 564 ##__VA_ARGS__ \ 565 : "memory", "cc" extra_clbr); \ 566 __ret = (rettype)__eax; \ 567 } \ 568 __ret; \ 569 }) 570 571 #define __PVOP_CALL(rettype, op, pre, post, ...) \ 572 ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \ 573 EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__) 574 575 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \ 576 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \ 577 PVOP_CALLEE_CLOBBERS, , \ 578 pre, post, ##__VA_ARGS__) 579 580 581 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \ 582 ({ \ 583 PVOP_VCALL_ARGS; \ 584 PVOP_TEST_NULL(op); \ 585 asm volatile(pre \ 586 paravirt_alt(PARAVIRT_CALL) \ 587 post \ 588 : call_clbr \ 589 : paravirt_type(op), \ 590 paravirt_clobber(clbr), \ 591 ##__VA_ARGS__ \ 592 : "memory", "cc" extra_clbr); \ 593 }) 594 595 #define __PVOP_VCALL(op, pre, post, ...) \ 596 ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \ 597 VEXTRA_CLOBBERS, \ 598 pre, post, ##__VA_ARGS__) 599 600 #define __PVOP_VCALLEESAVE(op, pre, post, ...) \ 601 ____PVOP_VCALL(op.func, CLBR_RET_REG, \ 602 PVOP_VCALLEE_CLOBBERS, , \ 603 pre, post, ##__VA_ARGS__) 604 605 606 607 #define PVOP_CALL0(rettype, op) \ 608 __PVOP_CALL(rettype, op, "", "") 609 #define PVOP_VCALL0(op) \ 610 __PVOP_VCALL(op, "", "") 611 612 #define PVOP_CALLEE0(rettype, op) \ 613 __PVOP_CALLEESAVE(rettype, op, "", "") 614 #define PVOP_VCALLEE0(op) \ 615 __PVOP_VCALLEESAVE(op, "", "") 616 617 618 #define PVOP_CALL1(rettype, op, arg1) \ 619 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1)) 620 #define PVOP_VCALL1(op, arg1) \ 621 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1)) 622 623 #define PVOP_CALLEE1(rettype, op, arg1) \ 624 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1)) 625 #define PVOP_VCALLEE1(op, arg1) \ 626 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1)) 627 628 629 #define PVOP_CALL2(rettype, op, arg1, arg2) \ 630 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \ 631 PVOP_CALL_ARG2(arg2)) 632 #define PVOP_VCALL2(op, arg1, arg2) \ 633 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \ 634 PVOP_CALL_ARG2(arg2)) 635 636 #define PVOP_CALLEE2(rettype, op, arg1, arg2) \ 637 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \ 638 PVOP_CALL_ARG2(arg2)) 639 #define PVOP_VCALLEE2(op, arg1, arg2) \ 640 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \ 641 PVOP_CALL_ARG2(arg2)) 642 643 644 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \ 645 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \ 646 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3)) 647 #define PVOP_VCALL3(op, arg1, arg2, arg3) \ 648 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \ 649 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3)) 650 651 /* This is the only difference in x86_64. We can make it much simpler */ 652 #ifdef CONFIG_X86_32 653 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \ 654 __PVOP_CALL(rettype, op, \ 655 "push %[_arg4];", "lea 4(%%esp),%%esp;", \ 656 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \ 657 PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4))) 658 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \ 659 __PVOP_VCALL(op, \ 660 "push %[_arg4];", "lea 4(%%esp),%%esp;", \ 661 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \ 662 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4))) 663 #else 664 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \ 665 __PVOP_CALL(rettype, op, "", "", \ 666 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \ 667 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4)) 668 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \ 669 __PVOP_VCALL(op, "", "", \ 670 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \ 671 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4)) 672 #endif 673 674 /* Lazy mode for batching updates / context switch */ 675 enum paravirt_lazy_mode { 676 PARAVIRT_LAZY_NONE, 677 PARAVIRT_LAZY_MMU, 678 PARAVIRT_LAZY_CPU, 679 }; 680 681 enum paravirt_lazy_mode paravirt_get_lazy_mode(void); 682 void paravirt_start_context_switch(struct task_struct *prev); 683 void paravirt_end_context_switch(struct task_struct *next); 684 685 void paravirt_enter_lazy_mmu(void); 686 void paravirt_leave_lazy_mmu(void); 687 void paravirt_flush_lazy_mmu(void); 688 689 void _paravirt_nop(void); 690 u32 _paravirt_ident_32(u32); 691 u64 _paravirt_ident_64(u64); 692 693 #define paravirt_nop ((void *)_paravirt_nop) 694 695 /* These all sit in the .parainstructions section to tell us what to patch. */ 696 struct paravirt_patch_site { 697 u8 *instr; /* original instructions */ 698 u8 instrtype; /* type of this instruction */ 699 u8 len; /* length of original instruction */ 700 u16 clobbers; /* what registers you may clobber */ 701 }; 702 703 extern struct paravirt_patch_site __parainstructions[], 704 __parainstructions_end[]; 705 706 #endif /* __ASSEMBLY__ */ 707 708 #endif /* _ASM_X86_PARAVIRT_TYPES_H */ 709