1 #ifndef _ASM_X86_PROCESSOR_H 2 #define _ASM_X86_PROCESSOR_H 3 4 #include <asm/processor-flags.h> 5 6 /* Forward declaration, a strange C thing */ 7 struct task_struct; 8 struct mm_struct; 9 10 #include <asm/vm86.h> 11 #include <asm/math_emu.h> 12 #include <asm/segment.h> 13 #include <asm/types.h> 14 #include <asm/sigcontext.h> 15 #include <asm/current.h> 16 #include <asm/cpufeature.h> 17 #include <asm/system.h> 18 #include <asm/page.h> 19 #include <asm/pgtable_types.h> 20 #include <asm/percpu.h> 21 #include <asm/msr.h> 22 #include <asm/desc_defs.h> 23 #include <asm/nops.h> 24 25 #include <linux/personality.h> 26 #include <linux/cpumask.h> 27 #include <linux/cache.h> 28 #include <linux/threads.h> 29 #include <linux/math64.h> 30 #include <linux/init.h> 31 #include <linux/err.h> 32 33 #define HBP_NUM 4 34 /* 35 * Default implementation of macro that returns current 36 * instruction pointer ("program counter"). 37 */ 38 static inline void *current_text_addr(void) 39 { 40 void *pc; 41 42 asm volatile("mov $1f, %0; 1:":"=r" (pc)); 43 44 return pc; 45 } 46 47 #ifdef CONFIG_X86_VSMP 48 # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT) 49 # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT) 50 #else 51 # define ARCH_MIN_TASKALIGN 16 52 # define ARCH_MIN_MMSTRUCT_ALIGN 0 53 #endif 54 55 /* 56 * CPU type and hardware bug flags. Kept separately for each CPU. 57 * Members of this structure are referenced in head.S, so think twice 58 * before touching them. [mj] 59 */ 60 61 struct cpuinfo_x86 { 62 __u8 x86; /* CPU family */ 63 __u8 x86_vendor; /* CPU vendor */ 64 __u8 x86_model; 65 __u8 x86_mask; 66 #ifdef CONFIG_X86_32 67 char wp_works_ok; /* It doesn't on 386's */ 68 69 /* Problems on some 486Dx4's and old 386's: */ 70 char hlt_works_ok; 71 char hard_math; 72 char rfu; 73 char fdiv_bug; 74 char f00f_bug; 75 char coma_bug; 76 char pad0; 77 #else 78 /* Number of 4K pages in DTLB/ITLB combined(in pages): */ 79 int x86_tlbsize; 80 #endif 81 __u8 x86_virt_bits; 82 __u8 x86_phys_bits; 83 /* CPUID returned core id bits: */ 84 __u8 x86_coreid_bits; 85 /* Max extended CPUID function supported: */ 86 __u32 extended_cpuid_level; 87 /* Maximum supported CPUID level, -1=no CPUID: */ 88 int cpuid_level; 89 __u32 x86_capability[NCAPINTS]; 90 char x86_vendor_id[16]; 91 char x86_model_id[64]; 92 /* in KB - valid for CPUS which support this call: */ 93 int x86_cache_size; 94 int x86_cache_alignment; /* In bytes */ 95 int x86_power; 96 unsigned long loops_per_jiffy; 97 #ifdef CONFIG_SMP 98 /* cpus sharing the last level cache: */ 99 cpumask_var_t llc_shared_map; 100 #endif 101 /* cpuid returned max cores value: */ 102 u16 x86_max_cores; 103 u16 apicid; 104 u16 initial_apicid; 105 u16 x86_clflush_size; 106 #ifdef CONFIG_SMP 107 /* number of cores as seen by the OS: */ 108 u16 booted_cores; 109 /* Physical processor id: */ 110 u16 phys_proc_id; 111 /* Core id: */ 112 u16 cpu_core_id; 113 /* Compute unit id */ 114 u8 compute_unit_id; 115 /* Index into per_cpu list: */ 116 u16 cpu_index; 117 #endif 118 } __attribute__((__aligned__(SMP_CACHE_BYTES))); 119 120 #define X86_VENDOR_INTEL 0 121 #define X86_VENDOR_CYRIX 1 122 #define X86_VENDOR_AMD 2 123 #define X86_VENDOR_UMC 3 124 #define X86_VENDOR_CENTAUR 5 125 #define X86_VENDOR_TRANSMETA 7 126 #define X86_VENDOR_NSC 8 127 #define X86_VENDOR_NUM 9 128 129 #define X86_VENDOR_UNKNOWN 0xff 130 131 /* 132 * capabilities of CPUs 133 */ 134 extern struct cpuinfo_x86 boot_cpu_data; 135 extern struct cpuinfo_x86 new_cpu_data; 136 137 extern struct tss_struct doublefault_tss; 138 extern __u32 cpu_caps_cleared[NCAPINTS]; 139 extern __u32 cpu_caps_set[NCAPINTS]; 140 141 #ifdef CONFIG_SMP 142 DECLARE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info); 143 #define cpu_data(cpu) per_cpu(cpu_info, cpu) 144 #else 145 #define cpu_info boot_cpu_data 146 #define cpu_data(cpu) boot_cpu_data 147 #endif 148 149 extern const struct seq_operations cpuinfo_op; 150 151 static inline int hlt_works(int cpu) 152 { 153 #ifdef CONFIG_X86_32 154 return cpu_data(cpu).hlt_works_ok; 155 #else 156 return 1; 157 #endif 158 } 159 160 #define cache_line_size() (boot_cpu_data.x86_cache_alignment) 161 162 extern void cpu_detect(struct cpuinfo_x86 *c); 163 164 extern struct pt_regs *idle_regs(struct pt_regs *); 165 166 extern void early_cpu_init(void); 167 extern void identify_boot_cpu(void); 168 extern void identify_secondary_cpu(struct cpuinfo_x86 *); 169 extern void print_cpu_info(struct cpuinfo_x86 *); 170 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c); 171 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c); 172 extern unsigned short num_cache_leaves; 173 174 extern void detect_extended_topology(struct cpuinfo_x86 *c); 175 extern void detect_ht(struct cpuinfo_x86 *c); 176 177 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx, 178 unsigned int *ecx, unsigned int *edx) 179 { 180 /* ecx is often an input as well as an output. */ 181 asm volatile("cpuid" 182 : "=a" (*eax), 183 "=b" (*ebx), 184 "=c" (*ecx), 185 "=d" (*edx) 186 : "0" (*eax), "2" (*ecx)); 187 } 188 189 static inline void load_cr3(pgd_t *pgdir) 190 { 191 write_cr3(__pa(pgdir)); 192 } 193 194 #ifdef CONFIG_X86_32 195 /* This is the TSS defined by the hardware. */ 196 struct x86_hw_tss { 197 unsigned short back_link, __blh; 198 unsigned long sp0; 199 unsigned short ss0, __ss0h; 200 unsigned long sp1; 201 /* ss1 caches MSR_IA32_SYSENTER_CS: */ 202 unsigned short ss1, __ss1h; 203 unsigned long sp2; 204 unsigned short ss2, __ss2h; 205 unsigned long __cr3; 206 unsigned long ip; 207 unsigned long flags; 208 unsigned long ax; 209 unsigned long cx; 210 unsigned long dx; 211 unsigned long bx; 212 unsigned long sp; 213 unsigned long bp; 214 unsigned long si; 215 unsigned long di; 216 unsigned short es, __esh; 217 unsigned short cs, __csh; 218 unsigned short ss, __ssh; 219 unsigned short ds, __dsh; 220 unsigned short fs, __fsh; 221 unsigned short gs, __gsh; 222 unsigned short ldt, __ldth; 223 unsigned short trace; 224 unsigned short io_bitmap_base; 225 226 } __attribute__((packed)); 227 #else 228 struct x86_hw_tss { 229 u32 reserved1; 230 u64 sp0; 231 u64 sp1; 232 u64 sp2; 233 u64 reserved2; 234 u64 ist[7]; 235 u32 reserved3; 236 u32 reserved4; 237 u16 reserved5; 238 u16 io_bitmap_base; 239 240 } __attribute__((packed)) ____cacheline_aligned; 241 #endif 242 243 /* 244 * IO-bitmap sizes: 245 */ 246 #define IO_BITMAP_BITS 65536 247 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) 248 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) 249 #define IO_BITMAP_OFFSET offsetof(struct tss_struct, io_bitmap) 250 #define INVALID_IO_BITMAP_OFFSET 0x8000 251 252 struct tss_struct { 253 /* 254 * The hardware state: 255 */ 256 struct x86_hw_tss x86_tss; 257 258 /* 259 * The extra 1 is there because the CPU will access an 260 * additional byte beyond the end of the IO permission 261 * bitmap. The extra byte must be all 1 bits, and must 262 * be within the limit. 263 */ 264 unsigned long io_bitmap[IO_BITMAP_LONGS + 1]; 265 266 /* 267 * .. and then another 0x100 bytes for the emergency kernel stack: 268 */ 269 unsigned long stack[64]; 270 271 } ____cacheline_aligned; 272 273 DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss); 274 275 /* 276 * Save the original ist values for checking stack pointers during debugging 277 */ 278 struct orig_ist { 279 unsigned long ist[7]; 280 }; 281 282 #define MXCSR_DEFAULT 0x1f80 283 284 struct i387_fsave_struct { 285 u32 cwd; /* FPU Control Word */ 286 u32 swd; /* FPU Status Word */ 287 u32 twd; /* FPU Tag Word */ 288 u32 fip; /* FPU IP Offset */ 289 u32 fcs; /* FPU IP Selector */ 290 u32 foo; /* FPU Operand Pointer Offset */ 291 u32 fos; /* FPU Operand Pointer Selector */ 292 293 /* 8*10 bytes for each FP-reg = 80 bytes: */ 294 u32 st_space[20]; 295 296 /* Software status information [not touched by FSAVE ]: */ 297 u32 status; 298 }; 299 300 struct i387_fxsave_struct { 301 u16 cwd; /* Control Word */ 302 u16 swd; /* Status Word */ 303 u16 twd; /* Tag Word */ 304 u16 fop; /* Last Instruction Opcode */ 305 union { 306 struct { 307 u64 rip; /* Instruction Pointer */ 308 u64 rdp; /* Data Pointer */ 309 }; 310 struct { 311 u32 fip; /* FPU IP Offset */ 312 u32 fcs; /* FPU IP Selector */ 313 u32 foo; /* FPU Operand Offset */ 314 u32 fos; /* FPU Operand Selector */ 315 }; 316 }; 317 u32 mxcsr; /* MXCSR Register State */ 318 u32 mxcsr_mask; /* MXCSR Mask */ 319 320 /* 8*16 bytes for each FP-reg = 128 bytes: */ 321 u32 st_space[32]; 322 323 /* 16*16 bytes for each XMM-reg = 256 bytes: */ 324 u32 xmm_space[64]; 325 326 u32 padding[12]; 327 328 union { 329 u32 padding1[12]; 330 u32 sw_reserved[12]; 331 }; 332 333 } __attribute__((aligned(16))); 334 335 struct i387_soft_struct { 336 u32 cwd; 337 u32 swd; 338 u32 twd; 339 u32 fip; 340 u32 fcs; 341 u32 foo; 342 u32 fos; 343 /* 8*10 bytes for each FP-reg = 80 bytes: */ 344 u32 st_space[20]; 345 u8 ftop; 346 u8 changed; 347 u8 lookahead; 348 u8 no_update; 349 u8 rm; 350 u8 alimit; 351 struct math_emu_info *info; 352 u32 entry_eip; 353 }; 354 355 struct ymmh_struct { 356 /* 16 * 16 bytes for each YMMH-reg = 256 bytes */ 357 u32 ymmh_space[64]; 358 }; 359 360 struct xsave_hdr_struct { 361 u64 xstate_bv; 362 u64 reserved1[2]; 363 u64 reserved2[5]; 364 } __attribute__((packed)); 365 366 struct xsave_struct { 367 struct i387_fxsave_struct i387; 368 struct xsave_hdr_struct xsave_hdr; 369 struct ymmh_struct ymmh; 370 /* new processor state extensions will go here */ 371 } __attribute__ ((packed, aligned (64))); 372 373 union thread_xstate { 374 struct i387_fsave_struct fsave; 375 struct i387_fxsave_struct fxsave; 376 struct i387_soft_struct soft; 377 struct xsave_struct xsave; 378 }; 379 380 struct fpu { 381 union thread_xstate *state; 382 }; 383 384 #ifdef CONFIG_X86_64 385 DECLARE_PER_CPU(struct orig_ist, orig_ist); 386 387 union irq_stack_union { 388 char irq_stack[IRQ_STACK_SIZE]; 389 /* 390 * GCC hardcodes the stack canary as %gs:40. Since the 391 * irq_stack is the object at %gs:0, we reserve the bottom 392 * 48 bytes of the irq stack for the canary. 393 */ 394 struct { 395 char gs_base[40]; 396 unsigned long stack_canary; 397 }; 398 }; 399 400 DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union); 401 DECLARE_INIT_PER_CPU(irq_stack_union); 402 403 DECLARE_PER_CPU(char *, irq_stack_ptr); 404 DECLARE_PER_CPU(unsigned int, irq_count); 405 extern unsigned long kernel_eflags; 406 extern asmlinkage void ignore_sysret(void); 407 #else /* X86_64 */ 408 #ifdef CONFIG_CC_STACKPROTECTOR 409 /* 410 * Make sure stack canary segment base is cached-aligned: 411 * "For Intel Atom processors, avoid non zero segment base address 412 * that is not aligned to cache line boundary at all cost." 413 * (Optim Ref Manual Assembly/Compiler Coding Rule 15.) 414 */ 415 struct stack_canary { 416 char __pad[20]; /* canary at %gs:20 */ 417 unsigned long canary; 418 }; 419 DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary); 420 #endif 421 #endif /* X86_64 */ 422 423 extern unsigned int xstate_size; 424 extern void free_thread_xstate(struct task_struct *); 425 extern struct kmem_cache *task_xstate_cachep; 426 427 struct perf_event; 428 429 struct thread_struct { 430 /* Cached TLS descriptors: */ 431 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES]; 432 unsigned long sp0; 433 unsigned long sp; 434 #ifdef CONFIG_X86_32 435 unsigned long sysenter_cs; 436 #else 437 unsigned long usersp; /* Copy from PDA */ 438 unsigned short es; 439 unsigned short ds; 440 unsigned short fsindex; 441 unsigned short gsindex; 442 #endif 443 #ifdef CONFIG_X86_32 444 unsigned long ip; 445 #endif 446 #ifdef CONFIG_X86_64 447 unsigned long fs; 448 #endif 449 unsigned long gs; 450 /* Save middle states of ptrace breakpoints */ 451 struct perf_event *ptrace_bps[HBP_NUM]; 452 /* Debug status used for traps, single steps, etc... */ 453 unsigned long debugreg6; 454 /* Keep track of the exact dr7 value set by the user */ 455 unsigned long ptrace_dr7; 456 /* Fault info: */ 457 unsigned long cr2; 458 unsigned long trap_no; 459 unsigned long error_code; 460 /* floating point and extended processor state */ 461 struct fpu fpu; 462 #ifdef CONFIG_X86_32 463 /* Virtual 86 mode info */ 464 struct vm86_struct __user *vm86_info; 465 unsigned long screen_bitmap; 466 unsigned long v86flags; 467 unsigned long v86mask; 468 unsigned long saved_sp0; 469 unsigned int saved_fs; 470 unsigned int saved_gs; 471 #endif 472 /* IO permissions: */ 473 unsigned long *io_bitmap_ptr; 474 unsigned long iopl; 475 /* Max allowed port in the bitmap, in bytes: */ 476 unsigned io_bitmap_max; 477 }; 478 479 static inline unsigned long native_get_debugreg(int regno) 480 { 481 unsigned long val = 0; /* Damn you, gcc! */ 482 483 switch (regno) { 484 case 0: 485 asm("mov %%db0, %0" :"=r" (val)); 486 break; 487 case 1: 488 asm("mov %%db1, %0" :"=r" (val)); 489 break; 490 case 2: 491 asm("mov %%db2, %0" :"=r" (val)); 492 break; 493 case 3: 494 asm("mov %%db3, %0" :"=r" (val)); 495 break; 496 case 6: 497 asm("mov %%db6, %0" :"=r" (val)); 498 break; 499 case 7: 500 asm("mov %%db7, %0" :"=r" (val)); 501 break; 502 default: 503 BUG(); 504 } 505 return val; 506 } 507 508 static inline void native_set_debugreg(int regno, unsigned long value) 509 { 510 switch (regno) { 511 case 0: 512 asm("mov %0, %%db0" ::"r" (value)); 513 break; 514 case 1: 515 asm("mov %0, %%db1" ::"r" (value)); 516 break; 517 case 2: 518 asm("mov %0, %%db2" ::"r" (value)); 519 break; 520 case 3: 521 asm("mov %0, %%db3" ::"r" (value)); 522 break; 523 case 6: 524 asm("mov %0, %%db6" ::"r" (value)); 525 break; 526 case 7: 527 asm("mov %0, %%db7" ::"r" (value)); 528 break; 529 default: 530 BUG(); 531 } 532 } 533 534 /* 535 * Set IOPL bits in EFLAGS from given mask 536 */ 537 static inline void native_set_iopl_mask(unsigned mask) 538 { 539 #ifdef CONFIG_X86_32 540 unsigned int reg; 541 542 asm volatile ("pushfl;" 543 "popl %0;" 544 "andl %1, %0;" 545 "orl %2, %0;" 546 "pushl %0;" 547 "popfl" 548 : "=&r" (reg) 549 : "i" (~X86_EFLAGS_IOPL), "r" (mask)); 550 #endif 551 } 552 553 static inline void 554 native_load_sp0(struct tss_struct *tss, struct thread_struct *thread) 555 { 556 tss->x86_tss.sp0 = thread->sp0; 557 #ifdef CONFIG_X86_32 558 /* Only happens when SEP is enabled, no need to test "SEP"arately: */ 559 if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) { 560 tss->x86_tss.ss1 = thread->sysenter_cs; 561 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0); 562 } 563 #endif 564 } 565 566 static inline void native_swapgs(void) 567 { 568 #ifdef CONFIG_X86_64 569 asm volatile("swapgs" ::: "memory"); 570 #endif 571 } 572 573 #ifdef CONFIG_PARAVIRT 574 #include <asm/paravirt.h> 575 #else 576 #define __cpuid native_cpuid 577 #define paravirt_enabled() 0 578 579 /* 580 * These special macros can be used to get or set a debugging register 581 */ 582 #define get_debugreg(var, register) \ 583 (var) = native_get_debugreg(register) 584 #define set_debugreg(value, register) \ 585 native_set_debugreg(register, value) 586 587 static inline void load_sp0(struct tss_struct *tss, 588 struct thread_struct *thread) 589 { 590 native_load_sp0(tss, thread); 591 } 592 593 #define set_iopl_mask native_set_iopl_mask 594 #endif /* CONFIG_PARAVIRT */ 595 596 /* 597 * Save the cr4 feature set we're using (ie 598 * Pentium 4MB enable and PPro Global page 599 * enable), so that any CPU's that boot up 600 * after us can get the correct flags. 601 */ 602 extern unsigned long mmu_cr4_features; 603 604 static inline void set_in_cr4(unsigned long mask) 605 { 606 unsigned long cr4; 607 608 mmu_cr4_features |= mask; 609 cr4 = read_cr4(); 610 cr4 |= mask; 611 write_cr4(cr4); 612 } 613 614 static inline void clear_in_cr4(unsigned long mask) 615 { 616 unsigned long cr4; 617 618 mmu_cr4_features &= ~mask; 619 cr4 = read_cr4(); 620 cr4 &= ~mask; 621 write_cr4(cr4); 622 } 623 624 typedef struct { 625 unsigned long seg; 626 } mm_segment_t; 627 628 629 /* 630 * create a kernel thread without removing it from tasklists 631 */ 632 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 633 634 /* Free all resources held by a thread. */ 635 extern void release_thread(struct task_struct *); 636 637 /* Prepare to copy thread state - unlazy all lazy state */ 638 extern void prepare_to_copy(struct task_struct *tsk); 639 640 unsigned long get_wchan(struct task_struct *p); 641 642 /* 643 * Generic CPUID function 644 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx 645 * resulting in stale register contents being returned. 646 */ 647 static inline void cpuid(unsigned int op, 648 unsigned int *eax, unsigned int *ebx, 649 unsigned int *ecx, unsigned int *edx) 650 { 651 *eax = op; 652 *ecx = 0; 653 __cpuid(eax, ebx, ecx, edx); 654 } 655 656 /* Some CPUID calls want 'count' to be placed in ecx */ 657 static inline void cpuid_count(unsigned int op, int count, 658 unsigned int *eax, unsigned int *ebx, 659 unsigned int *ecx, unsigned int *edx) 660 { 661 *eax = op; 662 *ecx = count; 663 __cpuid(eax, ebx, ecx, edx); 664 } 665 666 /* 667 * CPUID functions returning a single datum 668 */ 669 static inline unsigned int cpuid_eax(unsigned int op) 670 { 671 unsigned int eax, ebx, ecx, edx; 672 673 cpuid(op, &eax, &ebx, &ecx, &edx); 674 675 return eax; 676 } 677 678 static inline unsigned int cpuid_ebx(unsigned int op) 679 { 680 unsigned int eax, ebx, ecx, edx; 681 682 cpuid(op, &eax, &ebx, &ecx, &edx); 683 684 return ebx; 685 } 686 687 static inline unsigned int cpuid_ecx(unsigned int op) 688 { 689 unsigned int eax, ebx, ecx, edx; 690 691 cpuid(op, &eax, &ebx, &ecx, &edx); 692 693 return ecx; 694 } 695 696 static inline unsigned int cpuid_edx(unsigned int op) 697 { 698 unsigned int eax, ebx, ecx, edx; 699 700 cpuid(op, &eax, &ebx, &ecx, &edx); 701 702 return edx; 703 } 704 705 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */ 706 static inline void rep_nop(void) 707 { 708 asm volatile("rep; nop" ::: "memory"); 709 } 710 711 static inline void cpu_relax(void) 712 { 713 rep_nop(); 714 } 715 716 /* Stop speculative execution and prefetching of modified code. */ 717 static inline void sync_core(void) 718 { 719 int tmp; 720 721 #if defined(CONFIG_M386) || defined(CONFIG_M486) 722 if (boot_cpu_data.x86 < 5) 723 /* There is no speculative execution. 724 * jmp is a barrier to prefetching. */ 725 asm volatile("jmp 1f\n1:\n" ::: "memory"); 726 else 727 #endif 728 /* cpuid is a barrier to speculative execution. 729 * Prefetched instructions are automatically 730 * invalidated when modified. */ 731 asm volatile("cpuid" : "=a" (tmp) : "0" (1) 732 : "ebx", "ecx", "edx", "memory"); 733 } 734 735 static inline void __monitor(const void *eax, unsigned long ecx, 736 unsigned long edx) 737 { 738 /* "monitor %eax, %ecx, %edx;" */ 739 asm volatile(".byte 0x0f, 0x01, 0xc8;" 740 :: "a" (eax), "c" (ecx), "d"(edx)); 741 } 742 743 static inline void __mwait(unsigned long eax, unsigned long ecx) 744 { 745 /* "mwait %eax, %ecx;" */ 746 asm volatile(".byte 0x0f, 0x01, 0xc9;" 747 :: "a" (eax), "c" (ecx)); 748 } 749 750 static inline void __sti_mwait(unsigned long eax, unsigned long ecx) 751 { 752 trace_hardirqs_on(); 753 /* "mwait %eax, %ecx;" */ 754 asm volatile("sti; .byte 0x0f, 0x01, 0xc9;" 755 :: "a" (eax), "c" (ecx)); 756 } 757 758 extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx); 759 760 extern void select_idle_routine(const struct cpuinfo_x86 *c); 761 extern void init_c1e_mask(void); 762 763 extern unsigned long boot_option_idle_override; 764 extern unsigned long idle_halt; 765 extern unsigned long idle_nomwait; 766 extern bool c1e_detected; 767 768 extern void enable_sep_cpu(void); 769 extern int sysenter_setup(void); 770 771 extern void early_trap_init(void); 772 773 /* Defined in head.S */ 774 extern struct desc_ptr early_gdt_descr; 775 776 extern void cpu_set_gdt(int); 777 extern void switch_to_new_gdt(int); 778 extern void load_percpu_segment(int); 779 extern void cpu_init(void); 780 781 static inline unsigned long get_debugctlmsr(void) 782 { 783 unsigned long debugctlmsr = 0; 784 785 #ifndef CONFIG_X86_DEBUGCTLMSR 786 if (boot_cpu_data.x86 < 6) 787 return 0; 788 #endif 789 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr); 790 791 return debugctlmsr; 792 } 793 794 static inline void update_debugctlmsr(unsigned long debugctlmsr) 795 { 796 #ifndef CONFIG_X86_DEBUGCTLMSR 797 if (boot_cpu_data.x86 < 6) 798 return; 799 #endif 800 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr); 801 } 802 803 /* 804 * from system description table in BIOS. Mostly for MCA use, but 805 * others may find it useful: 806 */ 807 extern unsigned int machine_id; 808 extern unsigned int machine_submodel_id; 809 extern unsigned int BIOS_revision; 810 811 /* Boot loader type from the setup header: */ 812 extern int bootloader_type; 813 extern int bootloader_version; 814 815 extern char ignore_fpu_irq; 816 817 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1 818 #define ARCH_HAS_PREFETCHW 819 #define ARCH_HAS_SPINLOCK_PREFETCH 820 821 #ifdef CONFIG_X86_32 822 # define BASE_PREFETCH ASM_NOP4 823 # define ARCH_HAS_PREFETCH 824 #else 825 # define BASE_PREFETCH "prefetcht0 (%1)" 826 #endif 827 828 /* 829 * Prefetch instructions for Pentium III (+) and AMD Athlon (+) 830 * 831 * It's not worth to care about 3dnow prefetches for the K6 832 * because they are microcoded there and very slow. 833 */ 834 static inline void prefetch(const void *x) 835 { 836 alternative_input(BASE_PREFETCH, 837 "prefetchnta (%1)", 838 X86_FEATURE_XMM, 839 "r" (x)); 840 } 841 842 /* 843 * 3dnow prefetch to get an exclusive cache line. 844 * Useful for spinlocks to avoid one state transition in the 845 * cache coherency protocol: 846 */ 847 static inline void prefetchw(const void *x) 848 { 849 alternative_input(BASE_PREFETCH, 850 "prefetchw (%1)", 851 X86_FEATURE_3DNOW, 852 "r" (x)); 853 } 854 855 static inline void spin_lock_prefetch(const void *x) 856 { 857 prefetchw(x); 858 } 859 860 #ifdef CONFIG_X86_32 861 /* 862 * User space process size: 3GB (default). 863 */ 864 #define TASK_SIZE PAGE_OFFSET 865 #define TASK_SIZE_MAX TASK_SIZE 866 #define STACK_TOP TASK_SIZE 867 #define STACK_TOP_MAX STACK_TOP 868 869 #define INIT_THREAD { \ 870 .sp0 = sizeof(init_stack) + (long)&init_stack, \ 871 .vm86_info = NULL, \ 872 .sysenter_cs = __KERNEL_CS, \ 873 .io_bitmap_ptr = NULL, \ 874 } 875 876 /* 877 * Note that the .io_bitmap member must be extra-big. This is because 878 * the CPU will access an additional byte beyond the end of the IO 879 * permission bitmap. The extra byte must be all 1 bits, and must 880 * be within the limit. 881 */ 882 #define INIT_TSS { \ 883 .x86_tss = { \ 884 .sp0 = sizeof(init_stack) + (long)&init_stack, \ 885 .ss0 = __KERNEL_DS, \ 886 .ss1 = __KERNEL_CS, \ 887 .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \ 888 }, \ 889 .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, \ 890 } 891 892 extern unsigned long thread_saved_pc(struct task_struct *tsk); 893 894 #define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long)) 895 #define KSTK_TOP(info) \ 896 ({ \ 897 unsigned long *__ptr = (unsigned long *)(info); \ 898 (unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \ 899 }) 900 901 /* 902 * The below -8 is to reserve 8 bytes on top of the ring0 stack. 903 * This is necessary to guarantee that the entire "struct pt_regs" 904 * is accessable even if the CPU haven't stored the SS/ESP registers 905 * on the stack (interrupt gate does not save these registers 906 * when switching to the same priv ring). 907 * Therefore beware: accessing the ss/esp fields of the 908 * "struct pt_regs" is possible, but they may contain the 909 * completely wrong values. 910 */ 911 #define task_pt_regs(task) \ 912 ({ \ 913 struct pt_regs *__regs__; \ 914 __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \ 915 __regs__ - 1; \ 916 }) 917 918 #define KSTK_ESP(task) (task_pt_regs(task)->sp) 919 920 #else 921 /* 922 * User space process size. 47bits minus one guard page. 923 */ 924 #define TASK_SIZE_MAX ((1UL << 47) - PAGE_SIZE) 925 926 /* This decides where the kernel will search for a free chunk of vm 927 * space during mmap's. 928 */ 929 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \ 930 0xc0000000 : 0xFFFFe000) 931 932 #define TASK_SIZE (test_thread_flag(TIF_IA32) ? \ 933 IA32_PAGE_OFFSET : TASK_SIZE_MAX) 934 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? \ 935 IA32_PAGE_OFFSET : TASK_SIZE_MAX) 936 937 #define STACK_TOP TASK_SIZE 938 #define STACK_TOP_MAX TASK_SIZE_MAX 939 940 #define INIT_THREAD { \ 941 .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \ 942 } 943 944 #define INIT_TSS { \ 945 .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \ 946 } 947 948 /* 949 * Return saved PC of a blocked thread. 950 * What is this good for? it will be always the scheduler or ret_from_fork. 951 */ 952 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8)) 953 954 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1) 955 extern unsigned long KSTK_ESP(struct task_struct *task); 956 #endif /* CONFIG_X86_64 */ 957 958 extern void start_thread(struct pt_regs *regs, unsigned long new_ip, 959 unsigned long new_sp); 960 961 /* 962 * This decides where the kernel will search for a free chunk of vm 963 * space during mmap's. 964 */ 965 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) 966 967 #define KSTK_EIP(task) (task_pt_regs(task)->ip) 968 969 /* Get/set a process' ability to use the timestamp counter instruction */ 970 #define GET_TSC_CTL(adr) get_tsc_mode((adr)) 971 #define SET_TSC_CTL(val) set_tsc_mode((val)) 972 973 extern int get_tsc_mode(unsigned long adr); 974 extern int set_tsc_mode(unsigned int val); 975 976 extern int amd_get_nb_id(int cpu); 977 978 struct aperfmperf { 979 u64 aperf, mperf; 980 }; 981 982 static inline void get_aperfmperf(struct aperfmperf *am) 983 { 984 WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_APERFMPERF)); 985 986 rdmsrl(MSR_IA32_APERF, am->aperf); 987 rdmsrl(MSR_IA32_MPERF, am->mperf); 988 } 989 990 #define APERFMPERF_SHIFT 10 991 992 static inline 993 unsigned long calc_aperfmperf_ratio(struct aperfmperf *old, 994 struct aperfmperf *new) 995 { 996 u64 aperf = new->aperf - old->aperf; 997 u64 mperf = new->mperf - old->mperf; 998 unsigned long ratio = aperf; 999 1000 mperf >>= APERFMPERF_SHIFT; 1001 if (mperf) 1002 ratio = div64_u64(aperf, mperf); 1003 1004 return ratio; 1005 } 1006 1007 /* 1008 * AMD errata checking 1009 */ 1010 #ifdef CONFIG_CPU_SUP_AMD 1011 extern const int amd_erratum_383[]; 1012 extern const int amd_erratum_400[]; 1013 extern bool cpu_has_amd_erratum(const int *); 1014 1015 #define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 } 1016 #define AMD_OSVW_ERRATUM(osvw_id, ...) { osvw_id, __VA_ARGS__, 0 } 1017 #define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \ 1018 ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end)) 1019 #define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff) 1020 #define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff) 1021 #define AMD_MODEL_RANGE_END(range) ((range) & 0xfff) 1022 1023 #else 1024 #define cpu_has_amd_erratum(x) (false) 1025 #endif /* CONFIG_CPU_SUP_AMD */ 1026 1027 #endif /* _ASM_X86_PROCESSOR_H */ 1028