1 #ifndef _ASM_X86_PARAVIRT_TYPES_H 2 #define _ASM_X86_PARAVIRT_TYPES_H 3 4 /* Bitmask of what can be clobbered: usually at least eax. */ 5 #define CLBR_NONE 0 6 #define CLBR_EAX (1 << 0) 7 #define CLBR_ECX (1 << 1) 8 #define CLBR_EDX (1 << 2) 9 #define CLBR_EDI (1 << 3) 10 11 #ifdef CONFIG_X86_32 12 /* CLBR_ANY should match all regs platform has. For i386, that's just it */ 13 #define CLBR_ANY ((1 << 4) - 1) 14 15 #define CLBR_ARG_REGS (CLBR_EAX | CLBR_EDX | CLBR_ECX) 16 #define CLBR_RET_REG (CLBR_EAX | CLBR_EDX) 17 #define CLBR_SCRATCH (0) 18 #else 19 #define CLBR_RAX CLBR_EAX 20 #define CLBR_RCX CLBR_ECX 21 #define CLBR_RDX CLBR_EDX 22 #define CLBR_RDI CLBR_EDI 23 #define CLBR_RSI (1 << 4) 24 #define CLBR_R8 (1 << 5) 25 #define CLBR_R9 (1 << 6) 26 #define CLBR_R10 (1 << 7) 27 #define CLBR_R11 (1 << 8) 28 29 #define CLBR_ANY ((1 << 9) - 1) 30 31 #define CLBR_ARG_REGS (CLBR_RDI | CLBR_RSI | CLBR_RDX | \ 32 CLBR_RCX | CLBR_R8 | CLBR_R9) 33 #define CLBR_RET_REG (CLBR_RAX) 34 #define CLBR_SCRATCH (CLBR_R10 | CLBR_R11) 35 36 #endif /* X86_64 */ 37 38 #define CLBR_CALLEE_SAVE ((CLBR_ARG_REGS | CLBR_SCRATCH) & ~CLBR_RET_REG) 39 40 #ifndef __ASSEMBLY__ 41 42 #include <asm/desc_defs.h> 43 #include <asm/kmap_types.h> 44 45 struct page; 46 struct thread_struct; 47 struct desc_ptr; 48 struct tss_struct; 49 struct mm_struct; 50 struct desc_struct; 51 struct task_struct; 52 struct cpumask; 53 54 /* 55 * Wrapper type for pointers to code which uses the non-standard 56 * calling convention. See PV_CALL_SAVE_REGS_THUNK below. 57 */ 58 struct paravirt_callee_save { 59 void *func; 60 }; 61 62 /* general info */ 63 struct pv_info { 64 unsigned int kernel_rpl; 65 int shared_kernel_pmd; 66 int paravirt_enabled; 67 const char *name; 68 }; 69 70 struct pv_init_ops { 71 /* 72 * Patch may replace one of the defined code sequences with 73 * arbitrary code, subject to the same register constraints. 74 * This generally means the code is not free to clobber any 75 * registers other than EAX. The patch function should return 76 * the number of bytes of code generated, as we nop pad the 77 * rest in generic code. 78 */ 79 unsigned (*patch)(u8 type, u16 clobber, void *insnbuf, 80 unsigned long addr, unsigned len); 81 }; 82 83 84 struct pv_lazy_ops { 85 /* Set deferred update mode, used for batching operations. */ 86 void (*enter)(void); 87 void (*leave)(void); 88 }; 89 90 struct pv_time_ops { 91 unsigned long long (*sched_clock)(void); 92 unsigned long (*get_tsc_khz)(void); 93 }; 94 95 struct pv_cpu_ops { 96 /* hooks for various privileged instructions */ 97 unsigned long (*get_debugreg)(int regno); 98 void (*set_debugreg)(int regno, unsigned long value); 99 100 void (*clts)(void); 101 102 unsigned long (*read_cr0)(void); 103 void (*write_cr0)(unsigned long); 104 105 unsigned long (*read_cr4_safe)(void); 106 unsigned long (*read_cr4)(void); 107 void (*write_cr4)(unsigned long); 108 109 #ifdef CONFIG_X86_64 110 unsigned long (*read_cr8)(void); 111 void (*write_cr8)(unsigned long); 112 #endif 113 114 /* Segment descriptor handling */ 115 void (*load_tr_desc)(void); 116 void (*load_gdt)(const struct desc_ptr *); 117 void (*load_idt)(const struct desc_ptr *); 118 void (*store_gdt)(struct desc_ptr *); 119 void (*store_idt)(struct desc_ptr *); 120 void (*set_ldt)(const void *desc, unsigned entries); 121 unsigned long (*store_tr)(void); 122 void (*load_tls)(struct thread_struct *t, unsigned int cpu); 123 #ifdef CONFIG_X86_64 124 void (*load_gs_index)(unsigned int idx); 125 #endif 126 void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum, 127 const void *desc); 128 void (*write_gdt_entry)(struct desc_struct *, 129 int entrynum, const void *desc, int size); 130 void (*write_idt_entry)(gate_desc *, 131 int entrynum, const gate_desc *gate); 132 void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries); 133 void (*free_ldt)(struct desc_struct *ldt, unsigned entries); 134 135 void (*load_sp0)(struct tss_struct *tss, struct thread_struct *t); 136 137 void (*set_iopl_mask)(unsigned mask); 138 139 void (*wbinvd)(void); 140 void (*io_delay)(void); 141 142 /* cpuid emulation, mostly so that caps bits can be disabled */ 143 void (*cpuid)(unsigned int *eax, unsigned int *ebx, 144 unsigned int *ecx, unsigned int *edx); 145 146 /* MSR, PMC and TSR operations. 147 err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */ 148 u64 (*read_msr)(unsigned int msr, int *err); 149 int (*rdmsr_regs)(u32 *regs); 150 int (*write_msr)(unsigned int msr, unsigned low, unsigned high); 151 int (*wrmsr_regs)(u32 *regs); 152 153 u64 (*read_tsc)(void); 154 u64 (*read_pmc)(int counter); 155 unsigned long long (*read_tscp)(unsigned int *aux); 156 157 /* 158 * Atomically enable interrupts and return to userspace. This 159 * is only ever used to return to 32-bit processes; in a 160 * 64-bit kernel, it's used for 32-on-64 compat processes, but 161 * never native 64-bit processes. (Jump, not call.) 162 */ 163 void (*irq_enable_sysexit)(void); 164 165 /* 166 * Switch to usermode gs and return to 64-bit usermode using 167 * sysret. Only used in 64-bit kernels to return to 64-bit 168 * processes. Usermode register state, including %rsp, must 169 * already be restored. 170 */ 171 void (*usergs_sysret64)(void); 172 173 /* 174 * Switch to usermode gs and return to 32-bit usermode using 175 * sysret. Used to return to 32-on-64 compat processes. 176 * Other usermode register state, including %esp, must already 177 * be restored. 178 */ 179 void (*usergs_sysret32)(void); 180 181 /* Normal iret. Jump to this with the standard iret stack 182 frame set up. */ 183 void (*iret)(void); 184 185 void (*swapgs)(void); 186 187 void (*start_context_switch)(struct task_struct *prev); 188 void (*end_context_switch)(struct task_struct *next); 189 }; 190 191 struct pv_irq_ops { 192 /* 193 * Get/set interrupt state. save_fl and restore_fl are only 194 * expected to use X86_EFLAGS_IF; all other bits 195 * returned from save_fl are undefined, and may be ignored by 196 * restore_fl. 197 * 198 * NOTE: These functions callers expect the callee to preserve 199 * more registers than the standard C calling convention. 200 */ 201 struct paravirt_callee_save save_fl; 202 struct paravirt_callee_save restore_fl; 203 struct paravirt_callee_save irq_disable; 204 struct paravirt_callee_save irq_enable; 205 206 void (*safe_halt)(void); 207 void (*halt)(void); 208 209 #ifdef CONFIG_X86_64 210 void (*adjust_exception_frame)(void); 211 #endif 212 }; 213 214 struct pv_apic_ops { 215 #ifdef CONFIG_X86_LOCAL_APIC 216 void (*startup_ipi_hook)(int phys_apicid, 217 unsigned long start_eip, 218 unsigned long start_esp); 219 #endif 220 }; 221 222 struct pv_mmu_ops { 223 unsigned long (*read_cr2)(void); 224 void (*write_cr2)(unsigned long); 225 226 unsigned long (*read_cr3)(void); 227 void (*write_cr3)(unsigned long); 228 229 /* 230 * Hooks for intercepting the creation/use/destruction of an 231 * mm_struct. 232 */ 233 void (*activate_mm)(struct mm_struct *prev, 234 struct mm_struct *next); 235 void (*dup_mmap)(struct mm_struct *oldmm, 236 struct mm_struct *mm); 237 void (*exit_mmap)(struct mm_struct *mm); 238 239 240 /* TLB operations */ 241 void (*flush_tlb_user)(void); 242 void (*flush_tlb_kernel)(void); 243 void (*flush_tlb_single)(unsigned long addr); 244 void (*flush_tlb_others)(const struct cpumask *cpus, 245 struct mm_struct *mm, 246 unsigned long va); 247 248 /* Hooks for allocating and freeing a pagetable top-level */ 249 int (*pgd_alloc)(struct mm_struct *mm); 250 void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd); 251 252 /* 253 * Hooks for allocating/releasing pagetable pages when they're 254 * attached to a pagetable 255 */ 256 void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn); 257 void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn); 258 void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn); 259 void (*release_pte)(unsigned long pfn); 260 void (*release_pmd)(unsigned long pfn); 261 void (*release_pud)(unsigned long pfn); 262 263 /* Pagetable manipulation functions */ 264 void (*set_pte)(pte_t *ptep, pte_t pteval); 265 void (*set_pte_at)(struct mm_struct *mm, unsigned long addr, 266 pte_t *ptep, pte_t pteval); 267 void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval); 268 void (*set_pmd_at)(struct mm_struct *mm, unsigned long addr, 269 pmd_t *pmdp, pmd_t pmdval); 270 void (*pte_update)(struct mm_struct *mm, unsigned long addr, 271 pte_t *ptep); 272 void (*pte_update_defer)(struct mm_struct *mm, 273 unsigned long addr, pte_t *ptep); 274 void (*pmd_update)(struct mm_struct *mm, unsigned long addr, 275 pmd_t *pmdp); 276 void (*pmd_update_defer)(struct mm_struct *mm, 277 unsigned long addr, pmd_t *pmdp); 278 279 pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr, 280 pte_t *ptep); 281 void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr, 282 pte_t *ptep, pte_t pte); 283 284 struct paravirt_callee_save pte_val; 285 struct paravirt_callee_save make_pte; 286 287 struct paravirt_callee_save pgd_val; 288 struct paravirt_callee_save make_pgd; 289 290 #if PAGETABLE_LEVELS >= 3 291 #ifdef CONFIG_X86_PAE 292 void (*set_pte_atomic)(pte_t *ptep, pte_t pteval); 293 void (*pte_clear)(struct mm_struct *mm, unsigned long addr, 294 pte_t *ptep); 295 void (*pmd_clear)(pmd_t *pmdp); 296 297 #endif /* CONFIG_X86_PAE */ 298 299 void (*set_pud)(pud_t *pudp, pud_t pudval); 300 301 struct paravirt_callee_save pmd_val; 302 struct paravirt_callee_save make_pmd; 303 304 #if PAGETABLE_LEVELS == 4 305 struct paravirt_callee_save pud_val; 306 struct paravirt_callee_save make_pud; 307 308 void (*set_pgd)(pgd_t *pudp, pgd_t pgdval); 309 #endif /* PAGETABLE_LEVELS == 4 */ 310 #endif /* PAGETABLE_LEVELS >= 3 */ 311 312 struct pv_lazy_ops lazy_mode; 313 314 /* dom0 ops */ 315 316 /* Sometimes the physical address is a pfn, and sometimes its 317 an mfn. We can tell which is which from the index. */ 318 void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx, 319 phys_addr_t phys, pgprot_t flags); 320 }; 321 322 struct arch_spinlock; 323 struct pv_lock_ops { 324 int (*spin_is_locked)(struct arch_spinlock *lock); 325 int (*spin_is_contended)(struct arch_spinlock *lock); 326 void (*spin_lock)(struct arch_spinlock *lock); 327 void (*spin_lock_flags)(struct arch_spinlock *lock, unsigned long flags); 328 int (*spin_trylock)(struct arch_spinlock *lock); 329 void (*spin_unlock)(struct arch_spinlock *lock); 330 }; 331 332 /* This contains all the paravirt structures: we get a convenient 333 * number for each function using the offset which we use to indicate 334 * what to patch. */ 335 struct paravirt_patch_template { 336 struct pv_init_ops pv_init_ops; 337 struct pv_time_ops pv_time_ops; 338 struct pv_cpu_ops pv_cpu_ops; 339 struct pv_irq_ops pv_irq_ops; 340 struct pv_apic_ops pv_apic_ops; 341 struct pv_mmu_ops pv_mmu_ops; 342 struct pv_lock_ops pv_lock_ops; 343 }; 344 345 extern struct pv_info pv_info; 346 extern struct pv_init_ops pv_init_ops; 347 extern struct pv_time_ops pv_time_ops; 348 extern struct pv_cpu_ops pv_cpu_ops; 349 extern struct pv_irq_ops pv_irq_ops; 350 extern struct pv_apic_ops pv_apic_ops; 351 extern struct pv_mmu_ops pv_mmu_ops; 352 extern struct pv_lock_ops pv_lock_ops; 353 354 #define PARAVIRT_PATCH(x) \ 355 (offsetof(struct paravirt_patch_template, x) / sizeof(void *)) 356 357 #define paravirt_type(op) \ 358 [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \ 359 [paravirt_opptr] "i" (&(op)) 360 #define paravirt_clobber(clobber) \ 361 [paravirt_clobber] "i" (clobber) 362 363 /* 364 * Generate some code, and mark it as patchable by the 365 * apply_paravirt() alternate instruction patcher. 366 */ 367 #define _paravirt_alt(insn_string, type, clobber) \ 368 "771:\n\t" insn_string "\n" "772:\n" \ 369 ".pushsection .parainstructions,\"a\"\n" \ 370 _ASM_ALIGN "\n" \ 371 _ASM_PTR " 771b\n" \ 372 " .byte " type "\n" \ 373 " .byte 772b-771b\n" \ 374 " .short " clobber "\n" \ 375 ".popsection\n" 376 377 /* Generate patchable code, with the default asm parameters. */ 378 #define paravirt_alt(insn_string) \ 379 _paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]") 380 381 /* Simple instruction patching code. */ 382 #define DEF_NATIVE(ops, name, code) \ 383 extern const char start_##ops##_##name[], end_##ops##_##name[]; \ 384 asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":") 385 386 unsigned paravirt_patch_nop(void); 387 unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len); 388 unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len); 389 unsigned paravirt_patch_ignore(unsigned len); 390 unsigned paravirt_patch_call(void *insnbuf, 391 const void *target, u16 tgt_clobbers, 392 unsigned long addr, u16 site_clobbers, 393 unsigned len); 394 unsigned paravirt_patch_jmp(void *insnbuf, const void *target, 395 unsigned long addr, unsigned len); 396 unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf, 397 unsigned long addr, unsigned len); 398 399 unsigned paravirt_patch_insns(void *insnbuf, unsigned len, 400 const char *start, const char *end); 401 402 unsigned native_patch(u8 type, u16 clobbers, void *ibuf, 403 unsigned long addr, unsigned len); 404 405 int paravirt_disable_iospace(void); 406 407 /* 408 * This generates an indirect call based on the operation type number. 409 * The type number, computed in PARAVIRT_PATCH, is derived from the 410 * offset into the paravirt_patch_template structure, and can therefore be 411 * freely converted back into a structure offset. 412 */ 413 #define PARAVIRT_CALL "call *%c[paravirt_opptr];" 414 415 /* 416 * These macros are intended to wrap calls through one of the paravirt 417 * ops structs, so that they can be later identified and patched at 418 * runtime. 419 * 420 * Normally, a call to a pv_op function is a simple indirect call: 421 * (pv_op_struct.operations)(args...). 422 * 423 * Unfortunately, this is a relatively slow operation for modern CPUs, 424 * because it cannot necessarily determine what the destination 425 * address is. In this case, the address is a runtime constant, so at 426 * the very least we can patch the call to e a simple direct call, or 427 * ideally, patch an inline implementation into the callsite. (Direct 428 * calls are essentially free, because the call and return addresses 429 * are completely predictable.) 430 * 431 * For i386, these macros rely on the standard gcc "regparm(3)" calling 432 * convention, in which the first three arguments are placed in %eax, 433 * %edx, %ecx (in that order), and the remaining arguments are placed 434 * on the stack. All caller-save registers (eax,edx,ecx) are expected 435 * to be modified (either clobbered or used for return values). 436 * X86_64, on the other hand, already specifies a register-based calling 437 * conventions, returning at %rax, with parameteres going on %rdi, %rsi, 438 * %rdx, and %rcx. Note that for this reason, x86_64 does not need any 439 * special handling for dealing with 4 arguments, unlike i386. 440 * However, x86_64 also have to clobber all caller saved registers, which 441 * unfortunately, are quite a bit (r8 - r11) 442 * 443 * The call instruction itself is marked by placing its start address 444 * and size into the .parainstructions section, so that 445 * apply_paravirt() in arch/i386/kernel/alternative.c can do the 446 * appropriate patching under the control of the backend pv_init_ops 447 * implementation. 448 * 449 * Unfortunately there's no way to get gcc to generate the args setup 450 * for the call, and then allow the call itself to be generated by an 451 * inline asm. Because of this, we must do the complete arg setup and 452 * return value handling from within these macros. This is fairly 453 * cumbersome. 454 * 455 * There are 5 sets of PVOP_* macros for dealing with 0-4 arguments. 456 * It could be extended to more arguments, but there would be little 457 * to be gained from that. For each number of arguments, there are 458 * the two VCALL and CALL variants for void and non-void functions. 459 * 460 * When there is a return value, the invoker of the macro must specify 461 * the return type. The macro then uses sizeof() on that type to 462 * determine whether its a 32 or 64 bit value, and places the return 463 * in the right register(s) (just %eax for 32-bit, and %edx:%eax for 464 * 64-bit). For x86_64 machines, it just returns at %rax regardless of 465 * the return value size. 466 * 467 * 64-bit arguments are passed as a pair of adjacent 32-bit arguments 468 * i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments 469 * in low,high order 470 * 471 * Small structures are passed and returned in registers. The macro 472 * calling convention can't directly deal with this, so the wrapper 473 * functions must do this. 474 * 475 * These PVOP_* macros are only defined within this header. This 476 * means that all uses must be wrapped in inline functions. This also 477 * makes sure the incoming and outgoing types are always correct. 478 */ 479 #ifdef CONFIG_X86_32 480 #define PVOP_VCALL_ARGS \ 481 unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx 482 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS 483 484 #define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x)) 485 #define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x)) 486 #define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x)) 487 488 #define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \ 489 "=c" (__ecx) 490 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS 491 492 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx) 493 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS 494 495 #define EXTRA_CLOBBERS 496 #define VEXTRA_CLOBBERS 497 #else /* CONFIG_X86_64 */ 498 /* [re]ax isn't an arg, but the return val */ 499 #define PVOP_VCALL_ARGS \ 500 unsigned long __edi = __edi, __esi = __esi, \ 501 __edx = __edx, __ecx = __ecx, __eax = __eax 502 #define PVOP_CALL_ARGS PVOP_VCALL_ARGS 503 504 #define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x)) 505 #define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x)) 506 #define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x)) 507 #define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x)) 508 509 #define PVOP_VCALL_CLOBBERS "=D" (__edi), \ 510 "=S" (__esi), "=d" (__edx), \ 511 "=c" (__ecx) 512 #define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax) 513 514 /* void functions are still allowed [re]ax for scratch */ 515 #define PVOP_VCALLEE_CLOBBERS "=a" (__eax) 516 #define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS 517 518 #define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11" 519 #define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11" 520 #endif /* CONFIG_X86_32 */ 521 522 #ifdef CONFIG_PARAVIRT_DEBUG 523 #define PVOP_TEST_NULL(op) BUG_ON(op == NULL) 524 #else 525 #define PVOP_TEST_NULL(op) ((void)op) 526 #endif 527 528 #define ____PVOP_CALL(rettype, op, clbr, call_clbr, extra_clbr, \ 529 pre, post, ...) \ 530 ({ \ 531 rettype __ret; \ 532 PVOP_CALL_ARGS; \ 533 PVOP_TEST_NULL(op); \ 534 /* This is 32-bit specific, but is okay in 64-bit */ \ 535 /* since this condition will never hold */ \ 536 if (sizeof(rettype) > sizeof(unsigned long)) { \ 537 asm volatile(pre \ 538 paravirt_alt(PARAVIRT_CALL) \ 539 post \ 540 : call_clbr \ 541 : paravirt_type(op), \ 542 paravirt_clobber(clbr), \ 543 ##__VA_ARGS__ \ 544 : "memory", "cc" extra_clbr); \ 545 __ret = (rettype)((((u64)__edx) << 32) | __eax); \ 546 } else { \ 547 asm volatile(pre \ 548 paravirt_alt(PARAVIRT_CALL) \ 549 post \ 550 : call_clbr \ 551 : paravirt_type(op), \ 552 paravirt_clobber(clbr), \ 553 ##__VA_ARGS__ \ 554 : "memory", "cc" extra_clbr); \ 555 __ret = (rettype)__eax; \ 556 } \ 557 __ret; \ 558 }) 559 560 #define __PVOP_CALL(rettype, op, pre, post, ...) \ 561 ____PVOP_CALL(rettype, op, CLBR_ANY, PVOP_CALL_CLOBBERS, \ 562 EXTRA_CLOBBERS, pre, post, ##__VA_ARGS__) 563 564 #define __PVOP_CALLEESAVE(rettype, op, pre, post, ...) \ 565 ____PVOP_CALL(rettype, op.func, CLBR_RET_REG, \ 566 PVOP_CALLEE_CLOBBERS, , \ 567 pre, post, ##__VA_ARGS__) 568 569 570 #define ____PVOP_VCALL(op, clbr, call_clbr, extra_clbr, pre, post, ...) \ 571 ({ \ 572 PVOP_VCALL_ARGS; \ 573 PVOP_TEST_NULL(op); \ 574 asm volatile(pre \ 575 paravirt_alt(PARAVIRT_CALL) \ 576 post \ 577 : call_clbr \ 578 : paravirt_type(op), \ 579 paravirt_clobber(clbr), \ 580 ##__VA_ARGS__ \ 581 : "memory", "cc" extra_clbr); \ 582 }) 583 584 #define __PVOP_VCALL(op, pre, post, ...) \ 585 ____PVOP_VCALL(op, CLBR_ANY, PVOP_VCALL_CLOBBERS, \ 586 VEXTRA_CLOBBERS, \ 587 pre, post, ##__VA_ARGS__) 588 589 #define __PVOP_VCALLEESAVE(op, pre, post, ...) \ 590 ____PVOP_VCALL(op.func, CLBR_RET_REG, \ 591 PVOP_VCALLEE_CLOBBERS, , \ 592 pre, post, ##__VA_ARGS__) 593 594 595 596 #define PVOP_CALL0(rettype, op) \ 597 __PVOP_CALL(rettype, op, "", "") 598 #define PVOP_VCALL0(op) \ 599 __PVOP_VCALL(op, "", "") 600 601 #define PVOP_CALLEE0(rettype, op) \ 602 __PVOP_CALLEESAVE(rettype, op, "", "") 603 #define PVOP_VCALLEE0(op) \ 604 __PVOP_VCALLEESAVE(op, "", "") 605 606 607 #define PVOP_CALL1(rettype, op, arg1) \ 608 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1)) 609 #define PVOP_VCALL1(op, arg1) \ 610 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1)) 611 612 #define PVOP_CALLEE1(rettype, op, arg1) \ 613 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1)) 614 #define PVOP_VCALLEE1(op, arg1) \ 615 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1)) 616 617 618 #define PVOP_CALL2(rettype, op, arg1, arg2) \ 619 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \ 620 PVOP_CALL_ARG2(arg2)) 621 #define PVOP_VCALL2(op, arg1, arg2) \ 622 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \ 623 PVOP_CALL_ARG2(arg2)) 624 625 #define PVOP_CALLEE2(rettype, op, arg1, arg2) \ 626 __PVOP_CALLEESAVE(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \ 627 PVOP_CALL_ARG2(arg2)) 628 #define PVOP_VCALLEE2(op, arg1, arg2) \ 629 __PVOP_VCALLEESAVE(op, "", "", PVOP_CALL_ARG1(arg1), \ 630 PVOP_CALL_ARG2(arg2)) 631 632 633 #define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \ 634 __PVOP_CALL(rettype, op, "", "", PVOP_CALL_ARG1(arg1), \ 635 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3)) 636 #define PVOP_VCALL3(op, arg1, arg2, arg3) \ 637 __PVOP_VCALL(op, "", "", PVOP_CALL_ARG1(arg1), \ 638 PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3)) 639 640 /* This is the only difference in x86_64. We can make it much simpler */ 641 #ifdef CONFIG_X86_32 642 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \ 643 __PVOP_CALL(rettype, op, \ 644 "push %[_arg4];", "lea 4(%%esp),%%esp;", \ 645 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \ 646 PVOP_CALL_ARG3(arg3), [_arg4] "mr" ((u32)(arg4))) 647 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \ 648 __PVOP_VCALL(op, \ 649 "push %[_arg4];", "lea 4(%%esp),%%esp;", \ 650 "0" ((u32)(arg1)), "1" ((u32)(arg2)), \ 651 "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4))) 652 #else 653 #define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \ 654 __PVOP_CALL(rettype, op, "", "", \ 655 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \ 656 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4)) 657 #define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \ 658 __PVOP_VCALL(op, "", "", \ 659 PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \ 660 PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4)) 661 #endif 662 663 /* Lazy mode for batching updates / context switch */ 664 enum paravirt_lazy_mode { 665 PARAVIRT_LAZY_NONE, 666 PARAVIRT_LAZY_MMU, 667 PARAVIRT_LAZY_CPU, 668 }; 669 670 enum paravirt_lazy_mode paravirt_get_lazy_mode(void); 671 void paravirt_start_context_switch(struct task_struct *prev); 672 void paravirt_end_context_switch(struct task_struct *next); 673 674 void paravirt_enter_lazy_mmu(void); 675 void paravirt_leave_lazy_mmu(void); 676 677 void _paravirt_nop(void); 678 u32 _paravirt_ident_32(u32); 679 u64 _paravirt_ident_64(u64); 680 681 #define paravirt_nop ((void *)_paravirt_nop) 682 683 /* These all sit in the .parainstructions section to tell us what to patch. */ 684 struct paravirt_patch_site { 685 u8 *instr; /* original instructions */ 686 u8 instrtype; /* type of this instruction */ 687 u8 len; /* length of original instruction */ 688 u16 clobbers; /* what registers you may clobber */ 689 }; 690 691 extern struct paravirt_patch_site __parainstructions[], 692 __parainstructions_end[]; 693 694 #endif /* __ASSEMBLY__ */ 695 696 #endif /* _ASM_X86_PARAVIRT_TYPES_H */ 697