arch/x86/include/asm/processor.h

   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                    rfu;
  93         char                    pad0;
  94         char                    pad1;
  95 #else
  96         /* Number of 4K pages in DTLB/ITLB combined(in pages): */
  97         int                     x86_tlbsize;
  98 #endif
  99         __u8                    x86_virt_bits;
 100         __u8                    x86_phys_bits;
 101         /* CPUID returned core id bits: */
 102         __u8                    x86_coreid_bits;
 103         /* Max extended CPUID function supported: */
 104         __u32                   extended_cpuid_level;
 105         /* Maximum supported CPUID level, -1=no CPUID: */
 106         int                     cpuid_level;
 107         __u32                   x86_capability[NCAPINTS + NBUGINTS];
 108         char                    x86_vendor_id[16];
 109         char                    x86_model_id[64];
 110         /* in KB - valid for CPUS which support this call: */
 111         int                     x86_cache_size;
 112         int                     x86_cache_alignment;    /* In bytes */
 113         int                     x86_power;
 114         unsigned long           loops_per_jiffy;
 115         /* cpuid returned max cores value: */
 116         u16                      x86_max_cores;
 117         u16                     apicid;
 118         u16                     initial_apicid;
 119         u16                     x86_clflush_size;
 120         /* number of cores as seen by the OS: */
 121         u16                     booted_cores;
 122         /* Physical processor id: */
 123         u16                     phys_proc_id;
 124         /* Core id: */
 125         u16                     cpu_core_id;
 126         /* Compute unit id */
 127         u8                      compute_unit_id;
 128         /* Index into per_cpu list: */
 129         u16                     cpu_index;
 130         u32                     microcode;
 131 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
 132
 133 #define X86_VENDOR_INTEL        0
 134 #define X86_VENDOR_CYRIX        1
 135 #define X86_VENDOR_AMD          2
 136 #define X86_VENDOR_UMC          3
 137 #define X86_VENDOR_CENTAUR      5
 138 #define X86_VENDOR_TRANSMETA    7
 139 #define X86_VENDOR_NSC          8
 140 #define X86_VENDOR_NUM          9
 141
 142 #define X86_VENDOR_UNKNOWN      0xff
 143
 144 /*
 145  * capabilities of CPUs
 146  */
 147 extern struct cpuinfo_x86       boot_cpu_data;
 148 extern struct cpuinfo_x86       new_cpu_data;
 149
 150 extern struct tss_struct        doublefault_tss;
 151 extern __u32                    cpu_caps_cleared[NCAPINTS];
 152 extern __u32                    cpu_caps_set[NCAPINTS];
 153
 154 #ifdef CONFIG_SMP
 155 DECLARE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
 156 #define cpu_data(cpu)           per_cpu(cpu_info, cpu)
 157 #else
 158 #define cpu_info                boot_cpu_data
 159 #define cpu_data(cpu)           boot_cpu_data
 160 #endif
 161
 162 extern const struct seq_operations cpuinfo_op;
 163
 164 #define cache_line_size()       (boot_cpu_data.x86_cache_alignment)
 165
 166 extern void cpu_detect(struct cpuinfo_x86 *c);
 167 extern void __cpuinit fpu_detect(struct cpuinfo_x86 *c);
 168
 169 extern void early_cpu_init(void);
 170 extern void identify_boot_cpu(void);
 171 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
 172 extern void print_cpu_info(struct cpuinfo_x86 *);
 173 void print_cpu_msr(struct cpuinfo_x86 *);
 174 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
 175 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
 176 extern void init_amd_cacheinfo(struct cpuinfo_x86 *c);
 177
 178 extern void detect_extended_topology(struct cpuinfo_x86 *c);
 179 extern void detect_ht(struct cpuinfo_x86 *c);
 180
 181 #ifdef CONFIG_X86_32
 182 extern int have_cpuid_p(void);
 183 #else
 184 static inline int have_cpuid_p(void)
 185 {
 186         return 1;
 187 }
 188 #endif
 189 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
 190                                 unsigned int *ecx, unsigned int *edx)
 191 {
 192         /* ecx is often an input as well as an output. */
 193         asm volatile("cpuid"
 194             : "=a" (*eax),
 195               "=b" (*ebx),
 196               "=c" (*ecx),
 197               "=d" (*edx)
 198             : "0" (*eax), "2" (*ecx)
 199             : "memory");
 200 }
 201
 202 static inline void load_cr3(pgd_t *pgdir)
 203 {
 204         write_cr3(__pa(pgdir));
 205 }
 206
 207 #ifdef CONFIG_X86_32
 208 /* This is the TSS defined by the hardware. */
 209 struct x86_hw_tss {
 210         unsigned short          back_link, __blh;
 211         unsigned long           sp0;
 212         unsigned short          ss0, __ss0h;
 213         unsigned long           sp1;
 214         /* ss1 caches MSR_IA32_SYSENTER_CS: */
 215         unsigned short          ss1, __ss1h;
 216         unsigned long           sp2;
 217         unsigned short          ss2, __ss2h;
 218         unsigned long           __cr3;
 219         unsigned long           ip;
 220         unsigned long           flags;
 221         unsigned long           ax;
 222         unsigned long           cx;
 223         unsigned long           dx;
 224         unsigned long           bx;
 225         unsigned long           sp;
 226         unsigned long           bp;
 227         unsigned long           si;
 228         unsigned long           di;
 229         unsigned short          es, __esh;
 230         unsigned short          cs, __csh;
 231         unsigned short          ss, __ssh;
 232         unsigned short          ds, __dsh;
 233         unsigned short          fs, __fsh;
 234         unsigned short          gs, __gsh;
 235         unsigned short          ldt, __ldth;
 236         unsigned short          trace;
 237         unsigned short          io_bitmap_base;
 238
 239 } __attribute__((packed));
 240 #else
 241 struct x86_hw_tss {
 242         u32                     reserved1;
 243         u64                     sp0;
 244         u64                     sp1;
 245         u64                     sp2;
 246         u64                     reserved2;
 247         u64                     ist[7];
 248         u32                     reserved3;
 249         u32                     reserved4;
 250         u16                     reserved5;
 251         u16                     io_bitmap_base;
 252
 253 } __attribute__((packed)) ____cacheline_aligned;
 254 #endif
 255
 256 /*
 257  * IO-bitmap sizes:
 258  */
 259 #define IO_BITMAP_BITS                  65536
 260 #define IO_BITMAP_BYTES                 (IO_BITMAP_BITS/8)
 261 #define IO_BITMAP_LONGS                 (IO_BITMAP_BYTES/sizeof(long))
 262 #define IO_BITMAP_OFFSET                offsetof(struct tss_struct, io_bitmap)
 263 #define INVALID_IO_BITMAP_OFFSET        0x8000
 264
 265 struct tss_struct {
 266         /*
 267          * The hardware state:
 268          */
 269         struct x86_hw_tss       x86_tss;
 270
 271         /*
 272          * The extra 1 is there because the CPU will access an
 273          * additional byte beyond the end of the IO permission
 274          * bitmap. The extra byte must be all 1 bits, and must
 275          * be within the limit.
 276          */
 277         unsigned long           io_bitmap[IO_BITMAP_LONGS + 1];
 278
 279         /*
 280          * .. and then another 0x100 bytes for the emergency kernel stack:
 281          */
 282         unsigned long           stack[64];
 283
 284 } ____cacheline_aligned;
 285
 286 DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss);
 287
 288 /*
 289  * Save the original ist values for checking stack pointers during debugging
 290  */
 291 struct orig_ist {
 292         unsigned long           ist[7];
 293 };
 294
 295 #define MXCSR_DEFAULT           0x1f80
 296
 297 struct i387_fsave_struct {
 298         u32                     cwd;    /* FPU Control Word             */
 299         u32                     swd;    /* FPU Status Word              */
 300         u32                     twd;    /* FPU Tag Word                 */
 301         u32                     fip;    /* FPU IP Offset                */
 302         u32                     fcs;    /* FPU IP Selector              */
 303         u32                     foo;    /* FPU Operand Pointer Offset   */
 304         u32                     fos;    /* FPU Operand Pointer Selector */
 305
 306         /* 8*10 bytes for each FP-reg = 80 bytes:                       */
 307         u32                     st_space[20];
 308
 309         /* Software status information [not touched by FSAVE ]:         */
 310         u32                     status;
 311 };
 312
 313 struct i387_fxsave_struct {
 314         u16                     cwd; /* Control Word                    */
 315         u16                     swd; /* Status Word                     */
 316         u16                     twd; /* Tag Word                        */
 317         u16                     fop; /* Last Instruction Opcode         */
 318         union {
 319                 struct {
 320                         u64     rip; /* Instruction Pointer             */
 321                         u64     rdp; /* Data Pointer                    */
 322                 };
 323                 struct {
 324                         u32     fip; /* FPU IP Offset                   */
 325                         u32     fcs; /* FPU IP Selector                 */
 326                         u32     foo; /* FPU Operand Offset              */
 327                         u32     fos; /* FPU Operand Selector            */
 328                 };
 329         };
 330         u32                     mxcsr;          /* MXCSR Register State */
 331         u32                     mxcsr_mask;     /* MXCSR Mask           */
 332
 333         /* 8*16 bytes for each FP-reg = 128 bytes:                      */
 334         u32                     st_space[32];
 335
 336         /* 16*16 bytes for each XMM-reg = 256 bytes:                    */
 337         u32                     xmm_space[64];
 338
 339         u32                     padding[12];
 340
 341         union {
 342                 u32             padding1[12];
 343                 u32             sw_reserved[12];
 344         };
 345
 346 } __attribute__((aligned(16)));
 347
 348 struct i387_soft_struct {
 349         u32                     cwd;
 350         u32                     swd;
 351         u32                     twd;
 352         u32                     fip;
 353         u32                     fcs;
 354         u32                     foo;
 355         u32                     fos;
 356         /* 8*10 bytes for each FP-reg = 80 bytes: */
 357         u32                     st_space[20];
 358         u8                      ftop;
 359         u8                      changed;
 360         u8                      lookahead;
 361         u8                      no_update;
 362         u8                      rm;
 363         u8                      alimit;
 364         struct math_emu_info    *info;
 365         u32                     entry_eip;
 366 };
 367
 368 struct ymmh_struct {
 369         /* 16 * 16 bytes for each YMMH-reg = 256 bytes */
 370         u32 ymmh_space[64];
 371 };
 372
 373 struct xsave_hdr_struct {
 374         u64 xstate_bv;
 375         u64 reserved1[2];
 376         u64 reserved2[5];
 377 } __attribute__((packed));
 378
 379 struct xsave_struct {
 380         struct i387_fxsave_struct i387;
 381         struct xsave_hdr_struct xsave_hdr;
 382         struct ymmh_struct ymmh;
 383         /* new processor state extensions will go here */
 384 } __attribute__ ((packed, aligned (64)));
 385
 386 union thread_xstate {
 387         struct i387_fsave_struct        fsave;
 388         struct i387_fxsave_struct       fxsave;
 389         struct i387_soft_struct         soft;
 390         struct xsave_struct             xsave;
 391 };
 392
 393 struct fpu {
 394         unsigned int last_cpu;
 395         unsigned int has_fpu;
 396         union thread_xstate *state;
 397 };
 398
 399 #ifdef CONFIG_X86_64
 400 DECLARE_PER_CPU(struct orig_ist, orig_ist);
 401
 402 union irq_stack_union {
 403         char irq_stack[IRQ_STACK_SIZE];
 404         /*
 405          * GCC hardcodes the stack canary as %gs:40.  Since the
 406          * irq_stack is the object at %gs:0, we reserve the bottom
 407          * 48 bytes of the irq stack for the canary.
 408          */
 409         struct {
 410                 char gs_base[40];
 411                 unsigned long stack_canary;
 412         };
 413 };
 414
 415 DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union);
 416 DECLARE_INIT_PER_CPU(irq_stack_union);
 417
 418 DECLARE_PER_CPU(char *, irq_stack_ptr);
 419 DECLARE_PER_CPU(unsigned int, irq_count);
 420 extern asmlinkage void ignore_sysret(void);
 421 #else   /* X86_64 */
 422 #ifdef CONFIG_CC_STACKPROTECTOR
 423 /*
 424  * Make sure stack canary segment base is cached-aligned:
 425  *   "For Intel Atom processors, avoid non zero segment base address
 426  *    that is not aligned to cache line boundary at all cost."
 427  * (Optim Ref Manual Assembly/Compiler Coding Rule 15.)
 428  */
 429 struct stack_canary {
 430         char __pad[20];         /* canary at %gs:20 */
 431         unsigned long canary;
 432 };
 433 DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
 434 #endif
 435 #endif  /* X86_64 */
 436
 437 extern unsigned int xstate_size;
 438 extern void free_thread_xstate(struct task_struct *);
 439 extern struct kmem_cache *task_xstate_cachep;
 440
 441 struct perf_event;
 442
 443 struct thread_struct {
 444         /* Cached TLS descriptors: */
 445         struct desc_struct      tls_array[GDT_ENTRY_TLS_ENTRIES];
 446         unsigned long           sp0;
 447         unsigned long           sp;
 448 #ifdef CONFIG_X86_32
 449         unsigned long           sysenter_cs;
 450 #else
 451         unsigned long           usersp; /* Copy from PDA */
 452         unsigned short          es;
 453         unsigned short          ds;
 454         unsigned short          fsindex;
 455         unsigned short          gsindex;
 456 #endif
 457 #ifdef CONFIG_X86_32
 458         unsigned long           ip;
 459 #endif
 460 #ifdef CONFIG_X86_64
 461         unsigned long           fs;
 462 #endif
 463         unsigned long           gs;
 464         /* Save middle states of ptrace breakpoints */
 465         struct perf_event       *ptrace_bps[HBP_NUM];
 466         /* Debug status used for traps, single steps, etc... */
 467         unsigned long           debugreg6;
 468         /* Keep track of the exact dr7 value set by the user */
 469         unsigned long           ptrace_dr7;
 470         /* Fault info: */
 471         unsigned long           cr2;
 472         unsigned long           trap_nr;
 473         unsigned long           error_code;
 474         /* floating point and extended processor state */
 475         struct fpu              fpu;
 476 #ifdef CONFIG_X86_32
 477         /* Virtual 86 mode info */
 478         struct vm86_struct __user *vm86_info;
 479         unsigned long           screen_bitmap;
 480         unsigned long           v86flags;
 481         unsigned long           v86mask;
 482         unsigned long           saved_sp0;
 483         unsigned int            saved_fs;
 484         unsigned int            saved_gs;
 485 #endif
 486         /* IO permissions: */
 487         unsigned long           *io_bitmap_ptr;
 488         unsigned long           iopl;
 489         /* Max allowed port in the bitmap, in bytes: */
 490         unsigned                io_bitmap_max;
 491 };
 492
 493 /*
 494  * Set IOPL bits in EFLAGS from given mask
 495  */
 496 static inline void native_set_iopl_mask(unsigned mask)
 497 {
 498 #ifdef CONFIG_X86_32
 499         unsigned int reg;
 500
 501         asm volatile ("pushfl;"
 502                       "popl %0;"
 503                       "andl %1, %0;"
 504                       "orl %2, %0;"
 505                       "pushl %0;"
 506                       "popfl"
 507                       : "=&r" (reg)
 508                       : "i" (~X86_EFLAGS_IOPL), "r" (mask));
 509 #endif
 510 }
 511
 512 static inline void
 513 native_load_sp0(struct tss_struct *tss, struct thread_struct *thread)
 514 {
 515         tss->x86_tss.sp0 = thread->sp0;
 516 #ifdef CONFIG_X86_32
 517         /* Only happens when SEP is enabled, no need to test "SEP"arately: */
 518         if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) {
 519                 tss->x86_tss.ss1 = thread->sysenter_cs;
 520                 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
 521         }
 522 #endif
 523 }
 524
 525 static inline void native_swapgs(void)
 526 {
 527 #ifdef CONFIG_X86_64
 528         asm volatile("swapgs" ::: "memory");
 529 #endif
 530 }
 531
 532 #ifdef CONFIG_PARAVIRT
 533 #include <asm/paravirt.h>
 534 #else
 535 #define __cpuid                 native_cpuid
 536 #define paravirt_enabled()      0
 537
 538 static inline void load_sp0(struct tss_struct *tss,
 539                             struct thread_struct *thread)
 540 {
 541         native_load_sp0(tss, thread);
 542 }
 543
 544 #define set_iopl_mask native_set_iopl_mask
 545 #endif /* CONFIG_PARAVIRT */
 546
 547 /*
 548  * Save the cr4 feature set we're using (ie
 549  * Pentium 4MB enable and PPro Global page
 550  * enable), so that any CPU's that boot up
 551  * after us can get the correct flags.
 552  */
 553 extern unsigned long mmu_cr4_features;
 554 extern u32 *trampoline_cr4_features;
 555
 556 static inline void set_in_cr4(unsigned long mask)
 557 {
 558         unsigned long cr4;
 559
 560         mmu_cr4_features |= mask;
 561         if (trampoline_cr4_features)
 562                 *trampoline_cr4_features = mmu_cr4_features;
 563         cr4 = read_cr4();
 564         cr4 |= mask;
 565         write_cr4(cr4);
 566 }
 567
 568 static inline void clear_in_cr4(unsigned long mask)
 569 {
 570         unsigned long cr4;
 571
 572         mmu_cr4_features &= ~mask;
 573         if (trampoline_cr4_features)
 574                 *trampoline_cr4_features = mmu_cr4_features;
 575         cr4 = read_cr4();
 576         cr4 &= ~mask;
 577         write_cr4(cr4);
 578 }
 579
 580 typedef struct {
 581         unsigned long           seg;
 582 } mm_segment_t;
 583
 584
 585 /* Free all resources held by a thread. */
 586 extern void release_thread(struct task_struct *);
 587
 588 unsigned long get_wchan(struct task_struct *p);
 589
 590 /*
 591  * Generic CPUID function
 592  * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
 593  * resulting in stale register contents being returned.
 594  */
 595 static inline void cpuid(unsigned int op,
 596                          unsigned int *eax, unsigned int *ebx,
 597                          unsigned int *ecx, unsigned int *edx)
 598 {
 599         *eax = op;
 600         *ecx = 0;
 601         __cpuid(eax, ebx, ecx, edx);
 602 }
 603
 604 /* Some CPUID calls want 'count' to be placed in ecx */
 605 static inline void cpuid_count(unsigned int op, int count,
 606                                unsigned int *eax, unsigned int *ebx,
 607                                unsigned int *ecx, unsigned int *edx)
 608 {
 609         *eax = op;
 610         *ecx = count;
 611         __cpuid(eax, ebx, ecx, edx);
 612 }
 613
 614 /*
 615  * CPUID functions returning a single datum
 616  */
 617 static inline unsigned int cpuid_eax(unsigned int op)
 618 {
 619         unsigned int eax, ebx, ecx, edx;
 620
 621         cpuid(op, &eax, &ebx, &ecx, &edx);
 622
 623         return eax;
 624 }
 625
 626 static inline unsigned int cpuid_ebx(unsigned int op)
 627 {
 628         unsigned int eax, ebx, ecx, edx;
 629
 630         cpuid(op, &eax, &ebx, &ecx, &edx);
 631
 632         return ebx;
 633 }
 634
 635 static inline unsigned int cpuid_ecx(unsigned int op)
 636 {
 637         unsigned int eax, ebx, ecx, edx;
 638
 639         cpuid(op, &eax, &ebx, &ecx, &edx);
 640
 641         return ecx;
 642 }
 643
 644 static inline unsigned int cpuid_edx(unsigned int op)
 645 {
 646         unsigned int eax, ebx, ecx, edx;
 647
 648         cpuid(op, &eax, &ebx, &ecx, &edx);
 649
 650         return edx;
 651 }
 652
 653 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
 654 static inline void rep_nop(void)
 655 {
 656         asm volatile("rep; nop" ::: "memory");
 657 }
 658
 659 static inline void cpu_relax(void)
 660 {
 661         rep_nop();
 662 }
 663
 664 /* Stop speculative execution and prefetching of modified code. */
 665 static inline void sync_core(void)
 666 {
 667         int tmp;
 668
 669 #ifdef CONFIG_M486
 670         /*
 671          * Do a CPUID if available, otherwise do a jump.  The jump
 672          * can conveniently enough be the jump around CPUID.
 673          */
 674         asm volatile("cmpl %2,%1\n\t"
 675                      "jl 1f\n\t"
 676                      "cpuid\n"
 677                      "1:"
 678                      : "=a" (tmp)
 679                      : "rm" (boot_cpu_data.cpuid_level), "ri" (0), "0" (1)
 680                      : "ebx", "ecx", "edx", "memory");
 681 #else
 682         /*
 683          * CPUID is a barrier to speculative execution.
 684          * Prefetched instructions are automatically
 685          * invalidated when modified.
 686          */
 687         asm volatile("cpuid"
 688                      : "=a" (tmp)
 689                      : "0" (1)
 690                      : "ebx", "ecx", "edx", "memory");
 691 #endif
 692 }
 693
 694 static inline void __monitor(const void *eax, unsigned long ecx,
 695                              unsigned long edx)
 696 {
 697         /* "monitor %eax, %ecx, %edx;" */
 698         asm volatile(".byte 0x0f, 0x01, 0xc8;"
 699                      :: "a" (eax), "c" (ecx), "d"(edx));
 700 }
 701
 702 static inline void __mwait(unsigned long eax, unsigned long ecx)
 703 {
 704         /* "mwait %eax, %ecx;" */
 705         asm volatile(".byte 0x0f, 0x01, 0xc9;"
 706                      :: "a" (eax), "c" (ecx));
 707 }
 708
 709 static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
 710 {
 711         trace_hardirqs_on();
 712         /* "mwait %eax, %ecx;" */
 713         asm volatile("sti; .byte 0x0f, 0x01, 0xc9;"
 714                      :: "a" (eax), "c" (ecx));
 715 }
 716
 717 extern void select_idle_routine(const struct cpuinfo_x86 *c);
 718 extern void init_amd_e400_c1e_mask(void);
 719
 720 extern unsigned long            boot_option_idle_override;
 721 extern bool                     amd_e400_c1e_detected;
 722
 723 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
 724                          IDLE_POLL};
 725
 726 extern void enable_sep_cpu(void);
 727 extern int sysenter_setup(void);
 728
 729 extern void early_trap_init(void);
 730 void early_trap_pf_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 extern void set_task_blockstep(struct task_struct *task, bool on);
 763
 764 /*
 765  * from system description table in BIOS. Mostly for MCA use, but
 766  * others may find it useful:
 767  */
 768 extern unsigned int             machine_id;
 769 extern unsigned int             machine_submodel_id;
 770 extern unsigned int             BIOS_revision;
 771
 772 /* Boot loader type from the setup header: */
 773 extern int                      bootloader_type;
 774 extern int                      bootloader_version;
 775
 776 extern char                     ignore_fpu_irq;
 777
 778 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
 779 #define ARCH_HAS_PREFETCHW
 780 #define ARCH_HAS_SPINLOCK_PREFETCH
 781
 782 #ifdef CONFIG_X86_32
 783 # define BASE_PREFETCH          ASM_NOP4
 784 # define ARCH_HAS_PREFETCH
 785 #else
 786 # define BASE_PREFETCH          "prefetcht0 (%1)"
 787 #endif
 788
 789 /*
 790  * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
 791  *
 792  * It's not worth to care about 3dnow prefetches for the K6
 793  * because they are microcoded there and very slow.
 794  */
 795 static inline void prefetch(const void *x)
 796 {
 797         alternative_input(BASE_PREFETCH,
 798                           "prefetchnta (%1)",
 799                           X86_FEATURE_XMM,
 800                           "r" (x));
 801 }
 802
 803 /*
 804  * 3dnow prefetch to get an exclusive cache line.
 805  * Useful for spinlocks to avoid one state transition in the
 806  * cache coherency protocol:
 807  */
 808 static inline void prefetchw(const void *x)
 809 {
 810         alternative_input(BASE_PREFETCH,
 811                           "prefetchw (%1)",
 812                           X86_FEATURE_3DNOW,
 813                           "r" (x));
 814 }
 815
 816 static inline void spin_lock_prefetch(const void *x)
 817 {
 818         prefetchw(x);
 819 }
 820
 821 #ifdef CONFIG_X86_32
 822 /*
 823  * User space process size: 3GB (default).
 824  */
 825 #define TASK_SIZE               PAGE_OFFSET
 826 #define TASK_SIZE_MAX           TASK_SIZE
 827 #define STACK_TOP               TASK_SIZE
 828 #define STACK_TOP_MAX           STACK_TOP
 829
 830 #define INIT_THREAD  {                                                    \
 831         .sp0                    = sizeof(init_stack) + (long)&init_stack, \
 832         .vm86_info              = NULL,                                   \
 833         .sysenter_cs            = __KERNEL_CS,                            \
 834         .io_bitmap_ptr          = NULL,                                   \
 835 }
 836
 837 /*
 838  * Note that the .io_bitmap member must be extra-big. This is because
 839  * the CPU will access an additional byte beyond the end of the IO
 840  * permission bitmap. The extra byte must be all 1 bits, and must
 841  * be within the limit.
 842  */
 843 #define INIT_TSS  {                                                       \
 844         .x86_tss = {                                                      \
 845                 .sp0            = sizeof(init_stack) + (long)&init_stack, \
 846                 .ss0            = __KERNEL_DS,                            \
 847                 .ss1            = __KERNEL_CS,                            \
 848                 .io_bitmap_base = INVALID_IO_BITMAP_OFFSET,               \
 849          },                                                               \
 850         .io_bitmap              = { [0 ... IO_BITMAP_LONGS] = ~0 },       \
 851 }
 852
 853 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 854
 855 #define THREAD_SIZE_LONGS      (THREAD_SIZE/sizeof(unsigned long))
 856 #define KSTK_TOP(info)                                                 \
 857 ({                                                                     \
 858        unsigned long *__ptr = (unsigned long *)(info);                 \
 859        (unsigned long)(&__ptr[THREAD_SIZE_LONGS]);                     \
 860 })
 861
 862 /*
 863  * The below -8 is to reserve 8 bytes on top of the ring0 stack.
 864  * This is necessary to guarantee that the entire "struct pt_regs"
 865  * is accessible even if the CPU haven't stored the SS/ESP registers
 866  * on the stack (interrupt gate does not save these registers
 867  * when switching to the same priv ring).
 868  * Therefore beware: accessing the ss/esp fields of the
 869  * "struct pt_regs" is possible, but they may contain the
 870  * completely wrong values.
 871  */
 872 #define task_pt_regs(task)                                             \
 873 ({                                                                     \
 874        struct pt_regs *__regs__;                                       \
 875        __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
 876        __regs__ - 1;                                                   \
 877 })
 878
 879 #define KSTK_ESP(task)          (task_pt_regs(task)->sp)
 880
 881 #else
 882 /*
 883  * User space process size. 47bits minus one guard page.
 884  */
 885 #define TASK_SIZE_MAX   ((1UL << 47) - PAGE_SIZE)
 886
 887 /* This decides where the kernel will search for a free chunk of vm
 888  * space during mmap's.
 889  */
 890 #define IA32_PAGE_OFFSET        ((current->personality & ADDR_LIMIT_3GB) ? \
 891                                         0xc0000000 : 0xFFFFe000)
 892
 893 #define TASK_SIZE               (test_thread_flag(TIF_ADDR32) ? \
 894                                         IA32_PAGE_OFFSET : TASK_SIZE_MAX)
 895 #define TASK_SIZE_OF(child)     ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \
 896                                         IA32_PAGE_OFFSET : TASK_SIZE_MAX)
 897
 898 #define STACK_TOP               TASK_SIZE
 899 #define STACK_TOP_MAX           TASK_SIZE_MAX
 900
 901 #define INIT_THREAD  { \
 902         .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
 903 }
 904
 905 #define INIT_TSS  { \
 906         .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
 907 }
 908
 909 /*
 910  * Return saved PC of a blocked thread.
 911  * What is this good for? it will be always the scheduler or ret_from_fork.
 912  */
 913 #define thread_saved_pc(t)      (*(unsigned long *)((t)->thread.sp - 8))
 914
 915 #define task_pt_regs(tsk)       ((struct pt_regs *)(tsk)->thread.sp0 - 1)
 916 extern unsigned long KSTK_ESP(struct task_struct *task);
 917
 918 /*
 919  * User space RSP while inside the SYSCALL fast path
 920  */
 921 DECLARE_PER_CPU(unsigned long, old_rsp);
 922
 923 #endif /* CONFIG_X86_64 */
 924
 925 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
 926                                                unsigned long new_sp);
 927
 928 /*
 929  * This decides where the kernel will search for a free chunk of vm
 930  * space during mmap's.
 931  */
 932 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
 933
 934 #define KSTK_EIP(task)          (task_pt_regs(task)->ip)
 935
 936 /* Get/set a process' ability to use the timestamp counter instruction */
 937 #define GET_TSC_CTL(adr)        get_tsc_mode((adr))
 938 #define SET_TSC_CTL(val)        set_tsc_mode((val))
 939
 940 extern int get_tsc_mode(unsigned long adr);
 941 extern int set_tsc_mode(unsigned int val);
 942
 943 extern u16 amd_get_nb_id(int cpu);
 944
 945 struct aperfmperf {
 946         u64 aperf, mperf;
 947 };
 948
 949 static inline void get_aperfmperf(struct aperfmperf *am)
 950 {
 951         WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_APERFMPERF));
 952
 953         rdmsrl(MSR_IA32_APERF, am->aperf);
 954         rdmsrl(MSR_IA32_MPERF, am->mperf);
 955 }
 956
 957 #define APERFMPERF_SHIFT 10
 958
 959 static inline
 960 unsigned long calc_aperfmperf_ratio(struct aperfmperf *old,
 961                                     struct aperfmperf *new)
 962 {
 963         u64 aperf = new->aperf - old->aperf;
 964         u64 mperf = new->mperf - old->mperf;
 965         unsigned long ratio = aperf;
 966
 967         mperf >>= APERFMPERF_SHIFT;
 968         if (mperf)
 969                 ratio = div64_u64(aperf, mperf);
 970
 971         return ratio;
 972 }
 973
 974 extern unsigned long arch_align_stack(unsigned long sp);
 975 extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
 976
 977 void default_idle(void);
 978 #ifdef  CONFIG_XEN
 979 bool xen_set_default_idle(void);
 980 #else
 981 #define xen_set_default_idle 0
 982 #endif
 983
 984 void stop_this_cpu(void *dummy);
 985 void df_debug(struct pt_regs *regs, long error_code);
 986 #endif /* _ASM_X86_PROCESSOR_H */