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/page.h> 18 #include <asm/pgtable_types.h> 19 #include <asm/percpu.h> 20 #include <asm/msr.h> 21 #include <asm/desc_defs.h> 22 #include <asm/nops.h> 23 #include <asm/special_insns.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 #include <linux/irqflags.h> 33 34 /* 35 * We handle most unaligned accesses in hardware. On the other hand 36 * unaligned DMA can be quite expensive on some Nehalem processors. 37 * 38 * Based on this we disable the IP header alignment in network drivers. 39 */ 40 #define NET_IP_ALIGN 0 41 42 #define HBP_NUM 4 43 /* 44 * Default implementation of macro that returns current 45 * instruction pointer ("program counter"). 46 */ 47 static inline void *current_text_addr(void) 48 { 49 void *pc; 50 51 asm volatile("mov $1f, %0; 1:":"=r" (pc)); 52 53 return pc; 54 } 55 56 #ifdef CONFIG_X86_VSMP 57 # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT) 58 # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT) 59 #else 60 # define ARCH_MIN_TASKALIGN 16 61 # define ARCH_MIN_MMSTRUCT_ALIGN 0 62 #endif 63 64 enum tlb_infos { 65 ENTRIES, 66 NR_INFO 67 }; 68 69 extern u16 __read_mostly tlb_lli_4k[NR_INFO]; 70 extern u16 __read_mostly tlb_lli_2m[NR_INFO]; 71 extern u16 __read_mostly tlb_lli_4m[NR_INFO]; 72 extern u16 __read_mostly tlb_lld_4k[NR_INFO]; 73 extern u16 __read_mostly tlb_lld_2m[NR_INFO]; 74 extern u16 __read_mostly tlb_lld_4m[NR_INFO]; 75 extern s8 __read_mostly tlb_flushall_shift; 76 77 /* 78 * CPU type and hardware bug flags. Kept separately for each CPU. 79 * Members of this structure are referenced in head.S, so think twice 80 * before touching them. [mj] 81 */ 82 83 struct cpuinfo_x86 { 84 __u8 x86; /* CPU family */ 85 __u8 x86_vendor; /* CPU vendor */ 86 __u8 x86_model; 87 __u8 x86_mask; 88 #ifdef CONFIG_X86_32 89 char wp_works_ok; /* It doesn't on 386's */ 90 91 /* Problems on some 486Dx4's and old 386's: */ 92 char hlt_works_ok; 93 char hard_math; 94 char rfu; 95 char fdiv_bug; 96 char f00f_bug; 97 char coma_bug; 98 char pad0; 99 #else 100 /* Number of 4K pages in DTLB/ITLB combined(in pages): */ 101 int x86_tlbsize; 102 #endif 103 __u8 x86_virt_bits; 104 __u8 x86_phys_bits; 105 /* CPUID returned core id bits: */ 106 __u8 x86_coreid_bits; 107 /* Max extended CPUID function supported: */ 108 __u32 extended_cpuid_level; 109 /* Maximum supported CPUID level, -1=no CPUID: */ 110 int cpuid_level; 111 __u32 x86_capability[NCAPINTS]; 112 char x86_vendor_id[16]; 113 char x86_model_id[64]; 114 /* in KB - valid for CPUS which support this call: */ 115 int x86_cache_size; 116 int x86_cache_alignment; /* In bytes */ 117 int x86_power; 118 unsigned long loops_per_jiffy; 119 /* cpuid returned max cores value: */ 120 u16 x86_max_cores; 121 u16 apicid; 122 u16 initial_apicid; 123 u16 x86_clflush_size; 124 /* number of cores as seen by the OS: */ 125 u16 booted_cores; 126 /* Physical processor id: */ 127 u16 phys_proc_id; 128 /* Core id: */ 129 u16 cpu_core_id; 130 /* Compute unit id */ 131 u8 compute_unit_id; 132 /* Index into per_cpu list: */ 133 u16 cpu_index; 134 u32 microcode; 135 } __attribute__((__aligned__(SMP_CACHE_BYTES))); 136 137 #define X86_VENDOR_INTEL 0 138 #define X86_VENDOR_CYRIX 1 139 #define X86_VENDOR_AMD 2 140 #define X86_VENDOR_UMC 3 141 #define X86_VENDOR_CENTAUR 5 142 #define X86_VENDOR_TRANSMETA 7 143 #define X86_VENDOR_NSC 8 144 #define X86_VENDOR_NUM 9 145 146 #define X86_VENDOR_UNKNOWN 0xff 147 148 /* 149 * capabilities of CPUs 150 */ 151 extern struct cpuinfo_x86 boot_cpu_data; 152 extern struct cpuinfo_x86 new_cpu_data; 153 154 extern struct tss_struct doublefault_tss; 155 extern __u32 cpu_caps_cleared[NCAPINTS]; 156 extern __u32 cpu_caps_set[NCAPINTS]; 157 158 #ifdef CONFIG_SMP 159 DECLARE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info); 160 #define cpu_data(cpu) per_cpu(cpu_info, cpu) 161 #else 162 #define cpu_info boot_cpu_data 163 #define cpu_data(cpu) boot_cpu_data 164 #endif 165 166 extern const struct seq_operations cpuinfo_op; 167 168 static inline int hlt_works(int cpu) 169 { 170 #ifdef CONFIG_X86_32 171 return cpu_data(cpu).hlt_works_ok; 172 #else 173 return 1; 174 #endif 175 } 176 177 #define cache_line_size() (boot_cpu_data.x86_cache_alignment) 178 179 extern void cpu_detect(struct cpuinfo_x86 *c); 180 181 extern struct pt_regs *idle_regs(struct pt_regs *); 182 183 extern void early_cpu_init(void); 184 extern void identify_boot_cpu(void); 185 extern void identify_secondary_cpu(struct cpuinfo_x86 *); 186 extern void print_cpu_info(struct cpuinfo_x86 *); 187 void print_cpu_msr(struct cpuinfo_x86 *); 188 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c); 189 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c); 190 extern unsigned short num_cache_leaves; 191 192 extern void detect_extended_topology(struct cpuinfo_x86 *c); 193 extern void detect_ht(struct cpuinfo_x86 *c); 194 195 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx, 196 unsigned int *ecx, unsigned int *edx) 197 { 198 /* ecx is often an input as well as an output. */ 199 asm volatile("cpuid" 200 : "=a" (*eax), 201 "=b" (*ebx), 202 "=c" (*ecx), 203 "=d" (*edx) 204 : "0" (*eax), "2" (*ecx) 205 : "memory"); 206 } 207 208 static inline void load_cr3(pgd_t *pgdir) 209 { 210 write_cr3(__pa(pgdir)); 211 } 212 213 #ifdef CONFIG_X86_32 214 /* This is the TSS defined by the hardware. */ 215 struct x86_hw_tss { 216 unsigned short back_link, __blh; 217 unsigned long sp0; 218 unsigned short ss0, __ss0h; 219 unsigned long sp1; 220 /* ss1 caches MSR_IA32_SYSENTER_CS: */ 221 unsigned short ss1, __ss1h; 222 unsigned long sp2; 223 unsigned short ss2, __ss2h; 224 unsigned long __cr3; 225 unsigned long ip; 226 unsigned long flags; 227 unsigned long ax; 228 unsigned long cx; 229 unsigned long dx; 230 unsigned long bx; 231 unsigned long sp; 232 unsigned long bp; 233 unsigned long si; 234 unsigned long di; 235 unsigned short es, __esh; 236 unsigned short cs, __csh; 237 unsigned short ss, __ssh; 238 unsigned short ds, __dsh; 239 unsigned short fs, __fsh; 240 unsigned short gs, __gsh; 241 unsigned short ldt, __ldth; 242 unsigned short trace; 243 unsigned short io_bitmap_base; 244 245 } __attribute__((packed)); 246 #else 247 struct x86_hw_tss { 248 u32 reserved1; 249 u64 sp0; 250 u64 sp1; 251 u64 sp2; 252 u64 reserved2; 253 u64 ist[7]; 254 u32 reserved3; 255 u32 reserved4; 256 u16 reserved5; 257 u16 io_bitmap_base; 258 259 } __attribute__((packed)) ____cacheline_aligned; 260 #endif 261 262 /* 263 * IO-bitmap sizes: 264 */ 265 #define IO_BITMAP_BITS 65536 266 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) 267 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) 268 #define IO_BITMAP_OFFSET offsetof(struct tss_struct, io_bitmap) 269 #define INVALID_IO_BITMAP_OFFSET 0x8000 270 271 struct tss_struct { 272 /* 273 * The hardware state: 274 */ 275 struct x86_hw_tss x86_tss; 276 277 /* 278 * The extra 1 is there because the CPU will access an 279 * additional byte beyond the end of the IO permission 280 * bitmap. The extra byte must be all 1 bits, and must 281 * be within the limit. 282 */ 283 unsigned long io_bitmap[IO_BITMAP_LONGS + 1]; 284 285 /* 286 * .. and then another 0x100 bytes for the emergency kernel stack: 287 */ 288 unsigned long stack[64]; 289 290 } ____cacheline_aligned; 291 292 DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss); 293 294 /* 295 * Save the original ist values for checking stack pointers during debugging 296 */ 297 struct orig_ist { 298 unsigned long ist[7]; 299 }; 300 301 #define MXCSR_DEFAULT 0x1f80 302 303 struct i387_fsave_struct { 304 u32 cwd; /* FPU Control Word */ 305 u32 swd; /* FPU Status Word */ 306 u32 twd; /* FPU Tag Word */ 307 u32 fip; /* FPU IP Offset */ 308 u32 fcs; /* FPU IP Selector */ 309 u32 foo; /* FPU Operand Pointer Offset */ 310 u32 fos; /* FPU Operand Pointer Selector */ 311 312 /* 8*10 bytes for each FP-reg = 80 bytes: */ 313 u32 st_space[20]; 314 315 /* Software status information [not touched by FSAVE ]: */ 316 u32 status; 317 }; 318 319 struct i387_fxsave_struct { 320 u16 cwd; /* Control Word */ 321 u16 swd; /* Status Word */ 322 u16 twd; /* Tag Word */ 323 u16 fop; /* Last Instruction Opcode */ 324 union { 325 struct { 326 u64 rip; /* Instruction Pointer */ 327 u64 rdp; /* Data Pointer */ 328 }; 329 struct { 330 u32 fip; /* FPU IP Offset */ 331 u32 fcs; /* FPU IP Selector */ 332 u32 foo; /* FPU Operand Offset */ 333 u32 fos; /* FPU Operand Selector */ 334 }; 335 }; 336 u32 mxcsr; /* MXCSR Register State */ 337 u32 mxcsr_mask; /* MXCSR Mask */ 338 339 /* 8*16 bytes for each FP-reg = 128 bytes: */ 340 u32 st_space[32]; 341 342 /* 16*16 bytes for each XMM-reg = 256 bytes: */ 343 u32 xmm_space[64]; 344 345 u32 padding[12]; 346 347 union { 348 u32 padding1[12]; 349 u32 sw_reserved[12]; 350 }; 351 352 } __attribute__((aligned(16))); 353 354 struct i387_soft_struct { 355 u32 cwd; 356 u32 swd; 357 u32 twd; 358 u32 fip; 359 u32 fcs; 360 u32 foo; 361 u32 fos; 362 /* 8*10 bytes for each FP-reg = 80 bytes: */ 363 u32 st_space[20]; 364 u8 ftop; 365 u8 changed; 366 u8 lookahead; 367 u8 no_update; 368 u8 rm; 369 u8 alimit; 370 struct math_emu_info *info; 371 u32 entry_eip; 372 }; 373 374 struct ymmh_struct { 375 /* 16 * 16 bytes for each YMMH-reg = 256 bytes */ 376 u32 ymmh_space[64]; 377 }; 378 379 struct xsave_hdr_struct { 380 u64 xstate_bv; 381 u64 reserved1[2]; 382 u64 reserved2[5]; 383 } __attribute__((packed)); 384 385 struct xsave_struct { 386 struct i387_fxsave_struct i387; 387 struct xsave_hdr_struct xsave_hdr; 388 struct ymmh_struct ymmh; 389 /* new processor state extensions will go here */ 390 } __attribute__ ((packed, aligned (64))); 391 392 union thread_xstate { 393 struct i387_fsave_struct fsave; 394 struct i387_fxsave_struct fxsave; 395 struct i387_soft_struct soft; 396 struct xsave_struct xsave; 397 }; 398 399 struct fpu { 400 unsigned int last_cpu; 401 unsigned int has_fpu; 402 union thread_xstate *state; 403 }; 404 405 #ifdef CONFIG_X86_64 406 DECLARE_PER_CPU(struct orig_ist, orig_ist); 407 408 union irq_stack_union { 409 char irq_stack[IRQ_STACK_SIZE]; 410 /* 411 * GCC hardcodes the stack canary as %gs:40. Since the 412 * irq_stack is the object at %gs:0, we reserve the bottom 413 * 48 bytes of the irq stack for the canary. 414 */ 415 struct { 416 char gs_base[40]; 417 unsigned long stack_canary; 418 }; 419 }; 420 421 DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union); 422 DECLARE_INIT_PER_CPU(irq_stack_union); 423 424 DECLARE_PER_CPU(char *, irq_stack_ptr); 425 DECLARE_PER_CPU(unsigned int, irq_count); 426 extern unsigned long kernel_eflags; 427 extern asmlinkage void ignore_sysret(void); 428 #else /* X86_64 */ 429 #ifdef CONFIG_CC_STACKPROTECTOR 430 /* 431 * Make sure stack canary segment base is cached-aligned: 432 * "For Intel Atom processors, avoid non zero segment base address 433 * that is not aligned to cache line boundary at all cost." 434 * (Optim Ref Manual Assembly/Compiler Coding Rule 15.) 435 */ 436 struct stack_canary { 437 char __pad[20]; /* canary at %gs:20 */ 438 unsigned long canary; 439 }; 440 DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary); 441 #endif 442 #endif /* X86_64 */ 443 444 extern unsigned int xstate_size; 445 extern void free_thread_xstate(struct task_struct *); 446 extern struct kmem_cache *task_xstate_cachep; 447 448 struct perf_event; 449 450 struct thread_struct { 451 /* Cached TLS descriptors: */ 452 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES]; 453 unsigned long sp0; 454 unsigned long sp; 455 #ifdef CONFIG_X86_32 456 unsigned long sysenter_cs; 457 #else 458 unsigned long usersp; /* Copy from PDA */ 459 unsigned short es; 460 unsigned short ds; 461 unsigned short fsindex; 462 unsigned short gsindex; 463 #endif 464 #ifdef CONFIG_X86_32 465 unsigned long ip; 466 #endif 467 #ifdef CONFIG_X86_64 468 unsigned long fs; 469 #endif 470 unsigned long gs; 471 /* Save middle states of ptrace breakpoints */ 472 struct perf_event *ptrace_bps[HBP_NUM]; 473 /* Debug status used for traps, single steps, etc... */ 474 unsigned long debugreg6; 475 /* Keep track of the exact dr7 value set by the user */ 476 unsigned long ptrace_dr7; 477 /* Fault info: */ 478 unsigned long cr2; 479 unsigned long trap_nr; 480 unsigned long error_code; 481 /* floating point and extended processor state */ 482 struct fpu fpu; 483 #ifdef CONFIG_X86_32 484 /* Virtual 86 mode info */ 485 struct vm86_struct __user *vm86_info; 486 unsigned long screen_bitmap; 487 unsigned long v86flags; 488 unsigned long v86mask; 489 unsigned long saved_sp0; 490 unsigned int saved_fs; 491 unsigned int saved_gs; 492 #endif 493 /* IO permissions: */ 494 unsigned long *io_bitmap_ptr; 495 unsigned long iopl; 496 /* Max allowed port in the bitmap, in bytes: */ 497 unsigned io_bitmap_max; 498 }; 499 500 /* 501 * Set IOPL bits in EFLAGS from given mask 502 */ 503 static inline void native_set_iopl_mask(unsigned mask) 504 { 505 #ifdef CONFIG_X86_32 506 unsigned int reg; 507 508 asm volatile ("pushfl;" 509 "popl %0;" 510 "andl %1, %0;" 511 "orl %2, %0;" 512 "pushl %0;" 513 "popfl" 514 : "=&r" (reg) 515 : "i" (~X86_EFLAGS_IOPL), "r" (mask)); 516 #endif 517 } 518 519 static inline void 520 native_load_sp0(struct tss_struct *tss, struct thread_struct *thread) 521 { 522 tss->x86_tss.sp0 = thread->sp0; 523 #ifdef CONFIG_X86_32 524 /* Only happens when SEP is enabled, no need to test "SEP"arately: */ 525 if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) { 526 tss->x86_tss.ss1 = thread->sysenter_cs; 527 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0); 528 } 529 #endif 530 } 531 532 static inline void native_swapgs(void) 533 { 534 #ifdef CONFIG_X86_64 535 asm volatile("swapgs" ::: "memory"); 536 #endif 537 } 538 539 #ifdef CONFIG_PARAVIRT 540 #include <asm/paravirt.h> 541 #else 542 #define __cpuid native_cpuid 543 #define paravirt_enabled() 0 544 545 static inline void load_sp0(struct tss_struct *tss, 546 struct thread_struct *thread) 547 { 548 native_load_sp0(tss, thread); 549 } 550 551 #define set_iopl_mask native_set_iopl_mask 552 #endif /* CONFIG_PARAVIRT */ 553 554 /* 555 * Save the cr4 feature set we're using (ie 556 * Pentium 4MB enable and PPro Global page 557 * enable), so that any CPU's that boot up 558 * after us can get the correct flags. 559 */ 560 extern unsigned long mmu_cr4_features; 561 extern u32 *trampoline_cr4_features; 562 563 static inline void set_in_cr4(unsigned long mask) 564 { 565 unsigned long cr4; 566 567 mmu_cr4_features |= mask; 568 if (trampoline_cr4_features) 569 *trampoline_cr4_features = mmu_cr4_features; 570 cr4 = read_cr4(); 571 cr4 |= mask; 572 write_cr4(cr4); 573 } 574 575 static inline void clear_in_cr4(unsigned long mask) 576 { 577 unsigned long cr4; 578 579 mmu_cr4_features &= ~mask; 580 if (trampoline_cr4_features) 581 *trampoline_cr4_features = mmu_cr4_features; 582 cr4 = read_cr4(); 583 cr4 &= ~mask; 584 write_cr4(cr4); 585 } 586 587 typedef struct { 588 unsigned long seg; 589 } mm_segment_t; 590 591 592 /* 593 * create a kernel thread without removing it from tasklists 594 */ 595 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); 596 597 /* Free all resources held by a thread. */ 598 extern void release_thread(struct task_struct *); 599 600 unsigned long get_wchan(struct task_struct *p); 601 602 /* 603 * Generic CPUID function 604 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx 605 * resulting in stale register contents being returned. 606 */ 607 static inline void cpuid(unsigned int op, 608 unsigned int *eax, unsigned int *ebx, 609 unsigned int *ecx, unsigned int *edx) 610 { 611 *eax = op; 612 *ecx = 0; 613 __cpuid(eax, ebx, ecx, edx); 614 } 615 616 /* Some CPUID calls want 'count' to be placed in ecx */ 617 static inline void cpuid_count(unsigned int op, int count, 618 unsigned int *eax, unsigned int *ebx, 619 unsigned int *ecx, unsigned int *edx) 620 { 621 *eax = op; 622 *ecx = count; 623 __cpuid(eax, ebx, ecx, edx); 624 } 625 626 /* 627 * CPUID functions returning a single datum 628 */ 629 static inline unsigned int cpuid_eax(unsigned int op) 630 { 631 unsigned int eax, ebx, ecx, edx; 632 633 cpuid(op, &eax, &ebx, &ecx, &edx); 634 635 return eax; 636 } 637 638 static inline unsigned int cpuid_ebx(unsigned int op) 639 { 640 unsigned int eax, ebx, ecx, edx; 641 642 cpuid(op, &eax, &ebx, &ecx, &edx); 643 644 return ebx; 645 } 646 647 static inline unsigned int cpuid_ecx(unsigned int op) 648 { 649 unsigned int eax, ebx, ecx, edx; 650 651 cpuid(op, &eax, &ebx, &ecx, &edx); 652 653 return ecx; 654 } 655 656 static inline unsigned int cpuid_edx(unsigned int op) 657 { 658 unsigned int eax, ebx, ecx, edx; 659 660 cpuid(op, &eax, &ebx, &ecx, &edx); 661 662 return edx; 663 } 664 665 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */ 666 static inline void rep_nop(void) 667 { 668 asm volatile("rep; nop" ::: "memory"); 669 } 670 671 static inline void cpu_relax(void) 672 { 673 rep_nop(); 674 } 675 676 /* Stop speculative execution and prefetching of modified code. */ 677 static inline void sync_core(void) 678 { 679 int tmp; 680 681 #if defined(CONFIG_M386) || defined(CONFIG_M486) 682 if (boot_cpu_data.x86 < 5) 683 /* There is no speculative execution. 684 * jmp is a barrier to prefetching. */ 685 asm volatile("jmp 1f\n1:\n" ::: "memory"); 686 else 687 #endif 688 /* cpuid is a barrier to speculative execution. 689 * Prefetched instructions are automatically 690 * invalidated when modified. */ 691 asm volatile("cpuid" : "=a" (tmp) : "0" (1) 692 : "ebx", "ecx", "edx", "memory"); 693 } 694 695 static inline void __monitor(const void *eax, unsigned long ecx, 696 unsigned long edx) 697 { 698 /* "monitor %eax, %ecx, %edx;" */ 699 asm volatile(".byte 0x0f, 0x01, 0xc8;" 700 :: "a" (eax), "c" (ecx), "d"(edx)); 701 } 702 703 static inline void __mwait(unsigned long eax, unsigned long ecx) 704 { 705 /* "mwait %eax, %ecx;" */ 706 asm volatile(".byte 0x0f, 0x01, 0xc9;" 707 :: "a" (eax), "c" (ecx)); 708 } 709 710 static inline void __sti_mwait(unsigned long eax, unsigned long ecx) 711 { 712 trace_hardirqs_on(); 713 /* "mwait %eax, %ecx;" */ 714 asm volatile("sti; .byte 0x0f, 0x01, 0xc9;" 715 :: "a" (eax), "c" (ecx)); 716 } 717 718 extern void select_idle_routine(const struct cpuinfo_x86 *c); 719 extern void init_amd_e400_c1e_mask(void); 720 721 extern unsigned long boot_option_idle_override; 722 extern bool amd_e400_c1e_detected; 723 724 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT, 725 IDLE_POLL, IDLE_FORCE_MWAIT}; 726 727 extern void enable_sep_cpu(void); 728 extern int sysenter_setup(void); 729 730 extern void early_trap_init(void); 731 732 /* Defined in head.S */ 733 extern struct desc_ptr early_gdt_descr; 734 735 extern void cpu_set_gdt(int); 736 extern void switch_to_new_gdt(int); 737 extern void load_percpu_segment(int); 738 extern void cpu_init(void); 739 740 static inline unsigned long get_debugctlmsr(void) 741 { 742 unsigned long debugctlmsr = 0; 743 744 #ifndef CONFIG_X86_DEBUGCTLMSR 745 if (boot_cpu_data.x86 < 6) 746 return 0; 747 #endif 748 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr); 749 750 return debugctlmsr; 751 } 752 753 static inline void update_debugctlmsr(unsigned long debugctlmsr) 754 { 755 #ifndef CONFIG_X86_DEBUGCTLMSR 756 if (boot_cpu_data.x86 < 6) 757 return; 758 #endif 759 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr); 760 } 761 762 /* 763 * from system description table in BIOS. Mostly for MCA use, but 764 * others may find it useful: 765 */ 766 extern unsigned int machine_id; 767 extern unsigned int machine_submodel_id; 768 extern unsigned int BIOS_revision; 769 770 /* Boot loader type from the setup header: */ 771 extern int bootloader_type; 772 extern int bootloader_version; 773 774 extern char ignore_fpu_irq; 775 776 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1 777 #define ARCH_HAS_PREFETCHW 778 #define ARCH_HAS_SPINLOCK_PREFETCH 779 780 #ifdef CONFIG_X86_32 781 # define BASE_PREFETCH ASM_NOP4 782 # define ARCH_HAS_PREFETCH 783 #else 784 # define BASE_PREFETCH "prefetcht0 (%1)" 785 #endif 786 787 /* 788 * Prefetch instructions for Pentium III (+) and AMD Athlon (+) 789 * 790 * It's not worth to care about 3dnow prefetches for the K6 791 * because they are microcoded there and very slow. 792 */ 793 static inline void prefetch(const void *x) 794 { 795 alternative_input(BASE_PREFETCH, 796 "prefetchnta (%1)", 797 X86_FEATURE_XMM, 798 "r" (x)); 799 } 800 801 /* 802 * 3dnow prefetch to get an exclusive cache line. 803 * Useful for spinlocks to avoid one state transition in the 804 * cache coherency protocol: 805 */ 806 static inline void prefetchw(const void *x) 807 { 808 alternative_input(BASE_PREFETCH, 809 "prefetchw (%1)", 810 X86_FEATURE_3DNOW, 811 "r" (x)); 812 } 813 814 static inline void spin_lock_prefetch(const void *x) 815 { 816 prefetchw(x); 817 } 818 819 #ifdef CONFIG_X86_32 820 /* 821 * User space process size: 3GB (default). 822 */ 823 #define TASK_SIZE PAGE_OFFSET 824 #define TASK_SIZE_MAX TASK_SIZE 825 #define STACK_TOP TASK_SIZE 826 #define STACK_TOP_MAX STACK_TOP 827 828 #define INIT_THREAD { \ 829 .sp0 = sizeof(init_stack) + (long)&init_stack, \ 830 .vm86_info = NULL, \ 831 .sysenter_cs = __KERNEL_CS, \ 832 .io_bitmap_ptr = NULL, \ 833 } 834 835 /* 836 * Note that the .io_bitmap member must be extra-big. This is because 837 * the CPU will access an additional byte beyond the end of the IO 838 * permission bitmap. The extra byte must be all 1 bits, and must 839 * be within the limit. 840 */ 841 #define INIT_TSS { \ 842 .x86_tss = { \ 843 .sp0 = sizeof(init_stack) + (long)&init_stack, \ 844 .ss0 = __KERNEL_DS, \ 845 .ss1 = __KERNEL_CS, \ 846 .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \ 847 }, \ 848 .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, \ 849 } 850 851 extern unsigned long thread_saved_pc(struct task_struct *tsk); 852 853 #define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long)) 854 #define KSTK_TOP(info) \ 855 ({ \ 856 unsigned long *__ptr = (unsigned long *)(info); \ 857 (unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \ 858 }) 859 860 /* 861 * The below -8 is to reserve 8 bytes on top of the ring0 stack. 862 * This is necessary to guarantee that the entire "struct pt_regs" 863 * is accessible even if the CPU haven't stored the SS/ESP registers 864 * on the stack (interrupt gate does not save these registers 865 * when switching to the same priv ring). 866 * Therefore beware: accessing the ss/esp fields of the 867 * "struct pt_regs" is possible, but they may contain the 868 * completely wrong values. 869 */ 870 #define task_pt_regs(task) \ 871 ({ \ 872 struct pt_regs *__regs__; \ 873 __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \ 874 __regs__ - 1; \ 875 }) 876 877 #define KSTK_ESP(task) (task_pt_regs(task)->sp) 878 879 #else 880 /* 881 * User space process size. 47bits minus one guard page. 882 */ 883 #define TASK_SIZE_MAX ((1UL << 47) - PAGE_SIZE) 884 885 /* This decides where the kernel will search for a free chunk of vm 886 * space during mmap's. 887 */ 888 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \ 889 0xc0000000 : 0xFFFFe000) 890 891 #define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \ 892 IA32_PAGE_OFFSET : TASK_SIZE_MAX) 893 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \ 894 IA32_PAGE_OFFSET : TASK_SIZE_MAX) 895 896 #define STACK_TOP TASK_SIZE 897 #define STACK_TOP_MAX TASK_SIZE_MAX 898 899 #define INIT_THREAD { \ 900 .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \ 901 } 902 903 #define INIT_TSS { \ 904 .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \ 905 } 906 907 /* 908 * Return saved PC of a blocked thread. 909 * What is this good for? it will be always the scheduler or ret_from_fork. 910 */ 911 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8)) 912 913 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1) 914 extern unsigned long KSTK_ESP(struct task_struct *task); 915 916 /* 917 * User space RSP while inside the SYSCALL fast path 918 */ 919 DECLARE_PER_CPU(unsigned long, old_rsp); 920 921 #endif /* CONFIG_X86_64 */ 922 923 extern void start_thread(struct pt_regs *regs, unsigned long new_ip, 924 unsigned long new_sp); 925 926 /* 927 * This decides where the kernel will search for a free chunk of vm 928 * space during mmap's. 929 */ 930 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3)) 931 932 #define KSTK_EIP(task) (task_pt_regs(task)->ip) 933 934 /* Get/set a process' ability to use the timestamp counter instruction */ 935 #define GET_TSC_CTL(adr) get_tsc_mode((adr)) 936 #define SET_TSC_CTL(val) set_tsc_mode((val)) 937 938 extern int get_tsc_mode(unsigned long adr); 939 extern int set_tsc_mode(unsigned int val); 940 941 extern int amd_get_nb_id(int cpu); 942 943 struct aperfmperf { 944 u64 aperf, mperf; 945 }; 946 947 static inline void get_aperfmperf(struct aperfmperf *am) 948 { 949 WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_APERFMPERF)); 950 951 rdmsrl(MSR_IA32_APERF, am->aperf); 952 rdmsrl(MSR_IA32_MPERF, am->mperf); 953 } 954 955 #define APERFMPERF_SHIFT 10 956 957 static inline 958 unsigned long calc_aperfmperf_ratio(struct aperfmperf *old, 959 struct aperfmperf *new) 960 { 961 u64 aperf = new->aperf - old->aperf; 962 u64 mperf = new->mperf - old->mperf; 963 unsigned long ratio = aperf; 964 965 mperf >>= APERFMPERF_SHIFT; 966 if (mperf) 967 ratio = div64_u64(aperf, mperf); 968 969 return ratio; 970 } 971 972 /* 973 * AMD errata checking 974 */ 975 #ifdef CONFIG_CPU_SUP_AMD 976 extern const int amd_erratum_383[]; 977 extern const int amd_erratum_400[]; 978 extern bool cpu_has_amd_erratum(const int *); 979 980 #define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 } 981 #define AMD_OSVW_ERRATUM(osvw_id, ...) { osvw_id, __VA_ARGS__, 0 } 982 #define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \ 983 ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end)) 984 #define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff) 985 #define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff) 986 #define AMD_MODEL_RANGE_END(range) ((range) & 0xfff) 987 988 #else 989 #define cpu_has_amd_erratum(x) (false) 990 #endif /* CONFIG_CPU_SUP_AMD */ 991 992 extern unsigned long arch_align_stack(unsigned long sp); 993 extern void free_init_pages(char *what, unsigned long begin, unsigned long end); 994 995 void default_idle(void); 996 bool set_pm_idle_to_default(void); 997 998 void stop_this_cpu(void *dummy); 999 1000 #endif /* _ASM_X86_PROCESSOR_H */ 1001