include/asm-i386/processor.h

   1 /*
   2  * include/asm-i386/processor.h
   3  *
   4  * Copyright (C) 1994 Linus Torvalds
   5  */
   6
   7 #ifndef __ASM_I386_PROCESSOR_H
   8 #define __ASM_I386_PROCESSOR_H
   9
  10 #include <asm/vm86.h>
  11 #include <asm/math_emu.h>
  12 #include <asm/segment.h>
  13 #include <asm/page.h>
  14 #include <asm/types.h>
  15 #include <asm/sigcontext.h>
  16 #include <asm/cpufeature.h>
  17 #include <asm/msr.h>
  18 #include <asm/system.h>
  19 #include <linux/cache.h>
  20 #include <linux/threads.h>
  21 #include <asm/percpu.h>
  22 #include <linux/cpumask.h>
  23 #include <linux/init.h>
  24 #include <asm/processor-flags.h>
  25
  26 /* flag for disabling the tsc */
  27 extern int tsc_disable;
  28
  29 struct desc_struct {
  30         unsigned long a,b;
  31 };
  32
  33 #define desc_empty(desc) \
  34                 (!((desc)->a | (desc)->b))
  35
  36 #define desc_equal(desc1, desc2) \
  37                 (((desc1)->a == (desc2)->a) && ((desc1)->b == (desc2)->b))
  38 /*
  39  * Default implementation of macro that returns current
  40  * instruction pointer ("program counter").
  41  */
  42 #define current_text_addr() ({ void *pc; __asm__("movl $1f,%0\n1:":"=g" (pc)); pc; })
  43
  44 /*
  45  *  CPU type and hardware bug flags. Kept separately for each CPU.
  46  *  Members of this structure are referenced in head.S, so think twice
  47  *  before touching them. [mj]
  48  */
  49
  50 struct cpuinfo_x86 {
  51         __u8    x86;            /* CPU family */
  52         __u8    x86_vendor;     /* CPU vendor */
  53         __u8    x86_model;
  54         __u8    x86_mask;
  55         char    wp_works_ok;    /* It doesn't on 386's */
  56         char    hlt_works_ok;   /* Problems on some 486Dx4's and old 386's */
  57         char    hard_math;
  58         char    rfu;
  59         int     cpuid_level;    /* Maximum supported CPUID level, -1=no CPUID */
  60         unsigned long   x86_capability[NCAPINTS];
  61         char    x86_vendor_id[16];
  62         char    x86_model_id[64];
  63         int     x86_cache_size;  /* in KB - valid for CPUS which support this
  64                                     call  */
  65         int     x86_cache_alignment;    /* In bytes */
  66         char    fdiv_bug;
  67         char    f00f_bug;
  68         char    coma_bug;
  69         char    pad0;
  70         int     x86_power;
  71         unsigned long loops_per_jiffy;
  72 #ifdef CONFIG_SMP
  73         cpumask_t llc_shared_map;       /* cpus sharing the last level cache */
  74 #endif
  75         unsigned char x86_max_cores;    /* cpuid returned max cores value */
  76         unsigned char apicid;
  77         unsigned short x86_clflush_size;
  78 #ifdef CONFIG_SMP
  79         unsigned char booted_cores;     /* number of cores as seen by OS */
  80         __u8 phys_proc_id;              /* Physical processor id. */
  81         __u8 cpu_core_id;               /* Core id */
  82 #endif
  83 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
  84
  85 #define X86_VENDOR_INTEL 0
  86 #define X86_VENDOR_CYRIX 1
  87 #define X86_VENDOR_AMD 2
  88 #define X86_VENDOR_UMC 3
  89 #define X86_VENDOR_NEXGEN 4
  90 #define X86_VENDOR_CENTAUR 5
  91 #define X86_VENDOR_RISE 6
  92 #define X86_VENDOR_TRANSMETA 7
  93 #define X86_VENDOR_NSC 8
  94 #define X86_VENDOR_NUM 9
  95 #define X86_VENDOR_UNKNOWN 0xff
  96
  97 /*
  98  * capabilities of CPUs
  99  */
 100
 101 extern struct cpuinfo_x86 boot_cpu_data;
 102 extern struct cpuinfo_x86 new_cpu_data;
 103 extern struct tss_struct doublefault_tss;
 104 DECLARE_PER_CPU(struct tss_struct, init_tss);
 105
 106 #ifdef CONFIG_SMP
 107 extern struct cpuinfo_x86 cpu_data[];
 108 #define current_cpu_data cpu_data[smp_processor_id()]
 109 #else
 110 #define cpu_data (&boot_cpu_data)
 111 #define current_cpu_data boot_cpu_data
 112 #endif
 113
 114 extern  int cpu_llc_id[NR_CPUS];
 115 extern char ignore_fpu_irq;
 116
 117 void __init cpu_detect(struct cpuinfo_x86 *c);
 118
 119 extern void identify_boot_cpu(void);
 120 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
 121 extern void print_cpu_info(struct cpuinfo_x86 *);
 122 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
 123 extern unsigned short num_cache_leaves;
 124
 125 #ifdef CONFIG_X86_HT
 126 extern void detect_ht(struct cpuinfo_x86 *c);
 127 #else
 128 static inline void detect_ht(struct cpuinfo_x86 *c) {}
 129 #endif
 130
 131 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
 132                                          unsigned int *ecx, unsigned int *edx)
 133 {
 134         /* ecx is often an input as well as an output. */
 135         __asm__("cpuid"
 136                 : "=a" (*eax),
 137                   "=b" (*ebx),
 138                   "=c" (*ecx),
 139                   "=d" (*edx)
 140                 : "0" (*eax), "2" (*ecx));
 141 }
 142
 143 #define load_cr3(pgdir) write_cr3(__pa(pgdir))
 144
 145 /*
 146  * Save the cr4 feature set we're using (ie
 147  * Pentium 4MB enable and PPro Global page
 148  * enable), so that any CPU's that boot up
 149  * after us can get the correct flags.
 150  */
 151 extern unsigned long mmu_cr4_features;
 152
 153 static inline void set_in_cr4 (unsigned long mask)
 154 {
 155         unsigned cr4;
 156         mmu_cr4_features |= mask;
 157         cr4 = read_cr4();
 158         cr4 |= mask;
 159         write_cr4(cr4);
 160 }
 161
 162 static inline void clear_in_cr4 (unsigned long mask)
 163 {
 164         unsigned cr4;
 165         mmu_cr4_features &= ~mask;
 166         cr4 = read_cr4();
 167         cr4 &= ~mask;
 168         write_cr4(cr4);
 169 }
 170
 171 /*
 172  *      NSC/Cyrix CPU indexed register access macros
 173  */
 174
 175 #define getCx86(reg) ({ outb((reg), 0x22); inb(0x23); })
 176
 177 #define setCx86(reg, data) do { \
 178         outb((reg), 0x22); \
 179         outb((data), 0x23); \
 180 } while (0)
 181
 182 /* Stop speculative execution */
 183 static inline void sync_core(void)
 184 {
 185         int tmp;
 186         asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx","ecx","edx","memory");
 187 }
 188
 189 static inline void __monitor(const void *eax, unsigned long ecx,
 190                 unsigned long edx)
 191 {
 192         /* "monitor %eax,%ecx,%edx;" */
 193         asm volatile(
 194                 ".byte 0x0f,0x01,0xc8;"
 195                 : :"a" (eax), "c" (ecx), "d"(edx));
 196 }
 197
 198 static inline void __mwait(unsigned long eax, unsigned long ecx)
 199 {
 200         /* "mwait %eax,%ecx;" */
 201         asm volatile(
 202                 ".byte 0x0f,0x01,0xc9;"
 203                 : :"a" (eax), "c" (ecx));
 204 }
 205
 206 extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx);
 207
 208 /* from system description table in BIOS.  Mostly for MCA use, but
 209 others may find it useful. */
 210 extern unsigned int machine_id;
 211 extern unsigned int machine_submodel_id;
 212 extern unsigned int BIOS_revision;
 213 extern unsigned int mca_pentium_flag;
 214
 215 /* Boot loader type from the setup header */
 216 extern int bootloader_type;
 217
 218 /*
 219  * User space process size: 3GB (default).
 220  */
 221 #define TASK_SIZE       (PAGE_OFFSET)
 222
 223 /* This decides where the kernel will search for a free chunk of vm
 224  * space during mmap's.
 225  */
 226 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
 227
 228 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 229
 230 /*
 231  * Size of io_bitmap.
 232  */
 233 #define IO_BITMAP_BITS  65536
 234 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
 235 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
 236 #define IO_BITMAP_OFFSET offsetof(struct tss_struct,io_bitmap)
 237 #define INVALID_IO_BITMAP_OFFSET 0x8000
 238 #define INVALID_IO_BITMAP_OFFSET_LAZY 0x9000
 239
 240 struct i387_fsave_struct {
 241         long    cwd;
 242         long    swd;
 243         long    twd;
 244         long    fip;
 245         long    fcs;
 246         long    foo;
 247         long    fos;
 248         long    st_space[20];   /* 8*10 bytes for each FP-reg = 80 bytes */
 249         long    status;         /* software status information */
 250 };
 251
 252 struct i387_fxsave_struct {
 253         unsigned short  cwd;
 254         unsigned short  swd;
 255         unsigned short  twd;
 256         unsigned short  fop;
 257         long    fip;
 258         long    fcs;
 259         long    foo;
 260         long    fos;
 261         long    mxcsr;
 262         long    mxcsr_mask;
 263         long    st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
 264         long    xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
 265         long    padding[56];
 266 } __attribute__ ((aligned (16)));
 267
 268 struct i387_soft_struct {
 269         long    cwd;
 270         long    swd;
 271         long    twd;
 272         long    fip;
 273         long    fcs;
 274         long    foo;
 275         long    fos;
 276         long    st_space[20];   /* 8*10 bytes for each FP-reg = 80 bytes */
 277         unsigned char   ftop, changed, lookahead, no_update, rm, alimit;
 278         struct info     *info;
 279         unsigned long   entry_eip;
 280 };
 281
 282 union i387_union {
 283         struct i387_fsave_struct        fsave;
 284         struct i387_fxsave_struct       fxsave;
 285         struct i387_soft_struct soft;
 286 };
 287
 288 typedef struct {
 289         unsigned long seg;
 290 } mm_segment_t;
 291
 292 struct thread_struct;
 293
 294 /* This is the TSS defined by the hardware. */
 295 struct i386_hw_tss {
 296         unsigned short  back_link,__blh;
 297         unsigned long   esp0;
 298         unsigned short  ss0,__ss0h;
 299         unsigned long   esp1;
 300         unsigned short  ss1,__ss1h;     /* ss1 is used to cache MSR_IA32_SYSENTER_CS */
 301         unsigned long   esp2;
 302         unsigned short  ss2,__ss2h;
 303         unsigned long   __cr3;
 304         unsigned long   eip;
 305         unsigned long   eflags;
 306         unsigned long   eax,ecx,edx,ebx;
 307         unsigned long   esp;
 308         unsigned long   ebp;
 309         unsigned long   esi;
 310         unsigned long   edi;
 311         unsigned short  es, __esh;
 312         unsigned short  cs, __csh;
 313         unsigned short  ss, __ssh;
 314         unsigned short  ds, __dsh;
 315         unsigned short  fs, __fsh;
 316         unsigned short  gs, __gsh;
 317         unsigned short  ldt, __ldth;
 318         unsigned short  trace, io_bitmap_base;
 319 } __attribute__((packed));
 320
 321 struct tss_struct {
 322         struct i386_hw_tss x86_tss;
 323
 324         /*
 325          * The extra 1 is there because the CPU will access an
 326          * additional byte beyond the end of the IO permission
 327          * bitmap. The extra byte must be all 1 bits, and must
 328          * be within the limit.
 329          */
 330         unsigned long   io_bitmap[IO_BITMAP_LONGS + 1];
 331         /*
 332          * Cache the current maximum and the last task that used the bitmap:
 333          */
 334         unsigned long io_bitmap_max;
 335         struct thread_struct *io_bitmap_owner;
 336         /*
 337          * pads the TSS to be cacheline-aligned (size is 0x100)
 338          */
 339         unsigned long __cacheline_filler[35];
 340         /*
 341          * .. and then another 0x100 bytes for emergency kernel stack
 342          */
 343         unsigned long stack[64];
 344 } __attribute__((packed));
 345
 346 #define ARCH_MIN_TASKALIGN      16
 347
 348 struct thread_struct {
 349 /* cached TLS descriptors. */
 350         struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
 351         unsigned long   esp0;
 352         unsigned long   sysenter_cs;
 353         unsigned long   eip;
 354         unsigned long   esp;
 355         unsigned long   fs;
 356         unsigned long   gs;
 357 /* Hardware debugging registers */
 358         unsigned long   debugreg[8];  /* %%db0-7 debug registers */
 359 /* fault info */
 360         unsigned long   cr2, trap_no, error_code;
 361 /* floating point info */
 362         union i387_union        i387;
 363 /* virtual 86 mode info */
 364         struct vm86_struct __user * vm86_info;
 365         unsigned long           screen_bitmap;
 366         unsigned long           v86flags, v86mask, saved_esp0;
 367         unsigned int            saved_fs, saved_gs;
 368 /* IO permissions */
 369         unsigned long   *io_bitmap_ptr;
 370         unsigned long   iopl;
 371 /* max allowed port in the bitmap, in bytes: */
 372         unsigned long   io_bitmap_max;
 373 };
 374
 375 #define INIT_THREAD  {                                                  \
 376         .esp0 = sizeof(init_stack) + (long)&init_stack,                 \
 377         .vm86_info = NULL,                                              \
 378         .sysenter_cs = __KERNEL_CS,                                     \
 379         .io_bitmap_ptr = NULL,                                          \
 380         .fs = __KERNEL_PERCPU,                                          \
 381 }
 382
 383 /*
 384  * Note that the .io_bitmap member must be extra-big. This is because
 385  * the CPU will access an additional byte beyond the end of the IO
 386  * permission bitmap. The extra byte must be all 1 bits, and must
 387  * be within the limit.
 388  */
 389 #define INIT_TSS  {                                                     \
 390         .x86_tss = {                                                    \
 391                 .esp0           = sizeof(init_stack) + (long)&init_stack, \
 392                 .ss0            = __KERNEL_DS,                          \
 393                 .ss1            = __KERNEL_CS,                          \
 394                 .io_bitmap_base = INVALID_IO_BITMAP_OFFSET,             \
 395          },                                                             \
 396         .io_bitmap      = { [ 0 ... IO_BITMAP_LONGS] = ~0 },            \
 397 }
 398
 399 #define start_thread(regs, new_eip, new_esp) do {               \
 400         __asm__("movl %0,%%gs": :"r" (0));                      \
 401         regs->xfs = 0;                                          \
 402         set_fs(USER_DS);                                        \
 403         regs->xds = __USER_DS;                                  \
 404         regs->xes = __USER_DS;                                  \
 405         regs->xss = __USER_DS;                                  \
 406         regs->xcs = __USER_CS;                                  \
 407         regs->eip = new_eip;                                    \
 408         regs->esp = new_esp;                                    \
 409 } while (0)
 410
 411 /* Forward declaration, a strange C thing */
 412 struct task_struct;
 413 struct mm_struct;
 414
 415 /* Free all resources held by a thread. */
 416 extern void release_thread(struct task_struct *);
 417
 418 /* Prepare to copy thread state - unlazy all lazy status */
 419 extern void prepare_to_copy(struct task_struct *tsk);
 420
 421 /*
 422  * create a kernel thread without removing it from tasklists
 423  */
 424 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 425
 426 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 427 void show_trace(struct task_struct *task, struct pt_regs *regs, unsigned long *stack);
 428
 429 unsigned long get_wchan(struct task_struct *p);
 430
 431 #define THREAD_SIZE_LONGS      (THREAD_SIZE/sizeof(unsigned long))
 432 #define KSTK_TOP(info)                                                 \
 433 ({                                                                     \
 434        unsigned long *__ptr = (unsigned long *)(info);                 \
 435        (unsigned long)(&__ptr[THREAD_SIZE_LONGS]);                     \
 436 })
 437
 438 /*
 439  * The below -8 is to reserve 8 bytes on top of the ring0 stack.
 440  * This is necessary to guarantee that the entire "struct pt_regs"
 441  * is accessable even if the CPU haven't stored the SS/ESP registers
 442  * on the stack (interrupt gate does not save these registers
 443  * when switching to the same priv ring).
 444  * Therefore beware: accessing the xss/esp fields of the
 445  * "struct pt_regs" is possible, but they may contain the
 446  * completely wrong values.
 447  */
 448 #define task_pt_regs(task)                                             \
 449 ({                                                                     \
 450        struct pt_regs *__regs__;                                       \
 451        __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
 452        __regs__ - 1;                                                   \
 453 })
 454
 455 #define KSTK_EIP(task) (task_pt_regs(task)->eip)
 456 #define KSTK_ESP(task) (task_pt_regs(task)->esp)
 457
 458
 459 struct microcode_header {
 460         unsigned int hdrver;
 461         unsigned int rev;
 462         unsigned int date;
 463         unsigned int sig;
 464         unsigned int cksum;
 465         unsigned int ldrver;
 466         unsigned int pf;
 467         unsigned int datasize;
 468         unsigned int totalsize;
 469         unsigned int reserved[3];
 470 };
 471
 472 struct microcode {
 473         struct microcode_header hdr;
 474         unsigned int bits[0];
 475 };
 476
 477 typedef struct microcode microcode_t;
 478 typedef struct microcode_header microcode_header_t;
 479
 480 /* microcode format is extended from prescott processors */
 481 struct extended_signature {
 482         unsigned int sig;
 483         unsigned int pf;
 484         unsigned int cksum;
 485 };
 486
 487 struct extended_sigtable {
 488         unsigned int count;
 489         unsigned int cksum;
 490         unsigned int reserved[3];
 491         struct extended_signature sigs[0];
 492 };
 493
 494 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
 495 static inline void rep_nop(void)
 496 {
 497         __asm__ __volatile__("rep;nop": : :"memory");
 498 }
 499
 500 #define cpu_relax()     rep_nop()
 501
 502 static inline void native_load_esp0(struct tss_struct *tss, struct thread_struct *thread)
 503 {
 504         tss->x86_tss.esp0 = thread->esp0;
 505         /* This can only happen when SEP is enabled, no need to test "SEP"arately */
 506         if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) {
 507                 tss->x86_tss.ss1 = thread->sysenter_cs;
 508                 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
 509         }
 510 }
 511
 512
 513 static inline unsigned long native_get_debugreg(int regno)
 514 {
 515         unsigned long val = 0;  /* Damn you, gcc! */
 516
 517         switch (regno) {
 518         case 0:
 519                 asm("movl %%db0, %0" :"=r" (val)); break;
 520         case 1:
 521                 asm("movl %%db1, %0" :"=r" (val)); break;
 522         case 2:
 523                 asm("movl %%db2, %0" :"=r" (val)); break;
 524         case 3:
 525                 asm("movl %%db3, %0" :"=r" (val)); break;
 526         case 6:
 527                 asm("movl %%db6, %0" :"=r" (val)); break;
 528         case 7:
 529                 asm("movl %%db7, %0" :"=r" (val)); break;
 530         default:
 531                 BUG();
 532         }
 533         return val;
 534 }
 535
 536 static inline void native_set_debugreg(int regno, unsigned long value)
 537 {
 538         switch (regno) {
 539         case 0:
 540                 asm("movl %0,%%db0"     : /* no output */ :"r" (value));
 541                 break;
 542         case 1:
 543                 asm("movl %0,%%db1"     : /* no output */ :"r" (value));
 544                 break;
 545         case 2:
 546                 asm("movl %0,%%db2"     : /* no output */ :"r" (value));
 547                 break;
 548         case 3:
 549                 asm("movl %0,%%db3"     : /* no output */ :"r" (value));
 550                 break;
 551         case 6:
 552                 asm("movl %0,%%db6"     : /* no output */ :"r" (value));
 553                 break;
 554         case 7:
 555                 asm("movl %0,%%db7"     : /* no output */ :"r" (value));
 556                 break;
 557         default:
 558                 BUG();
 559         }
 560 }
 561
 562 /*
 563  * Set IOPL bits in EFLAGS from given mask
 564  */
 565 static inline void native_set_iopl_mask(unsigned mask)
 566 {
 567         unsigned int reg;
 568         __asm__ __volatile__ ("pushfl;"
 569                               "popl %0;"
 570                               "andl %1, %0;"
 571                               "orl %2, %0;"
 572                               "pushl %0;"
 573                               "popfl"
 574                                 : "=&r" (reg)
 575                                 : "i" (~X86_EFLAGS_IOPL), "r" (mask));
 576 }
 577
 578 #ifdef CONFIG_PARAVIRT
 579 #include <asm/paravirt.h>
 580 #else
 581 #define paravirt_enabled() 0
 582 #define __cpuid native_cpuid
 583
 584 static inline void load_esp0(struct tss_struct *tss, struct thread_struct *thread)
 585 {
 586         native_load_esp0(tss, thread);
 587 }
 588
 589 /*
 590  * These special macros can be used to get or set a debugging register
 591  */
 592 #define get_debugreg(var, register)                             \
 593         (var) = native_get_debugreg(register)
 594 #define set_debugreg(value, register)                           \
 595         native_set_debugreg(register, value)
 596
 597 #define set_iopl_mask native_set_iopl_mask
 598 #endif /* CONFIG_PARAVIRT */
 599
 600 /*
 601  * Generic CPUID function
 602  * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
 603  * resulting in stale register contents being returned.
 604  */
 605 static inline void cpuid(unsigned int op, unsigned int *eax, unsigned int *ebx, unsigned int *ecx, unsigned int *edx)
 606 {
 607         *eax = op;
 608         *ecx = 0;
 609         __cpuid(eax, ebx, ecx, edx);
 610 }
 611
 612 /* Some CPUID calls want 'count' to be placed in ecx */
 613 static inline void cpuid_count(int op, int count, int *eax, int *ebx, int *ecx,
 614                                int *edx)
 615 {
 616         *eax = op;
 617         *ecx = count;
 618         __cpuid(eax, ebx, ecx, edx);
 619 }
 620
 621 /*
 622  * CPUID functions returning a single datum
 623  */
 624 static inline unsigned int cpuid_eax(unsigned int op)
 625 {
 626         unsigned int eax, ebx, ecx, edx;
 627
 628         cpuid(op, &eax, &ebx, &ecx, &edx);
 629         return eax;
 630 }
 631 static inline unsigned int cpuid_ebx(unsigned int op)
 632 {
 633         unsigned int eax, ebx, ecx, edx;
 634
 635         cpuid(op, &eax, &ebx, &ecx, &edx);
 636         return ebx;
 637 }
 638 static inline unsigned int cpuid_ecx(unsigned int op)
 639 {
 640         unsigned int eax, ebx, ecx, edx;
 641
 642         cpuid(op, &eax, &ebx, &ecx, &edx);
 643         return ecx;
 644 }
 645 static inline unsigned int cpuid_edx(unsigned int op)
 646 {
 647         unsigned int eax, ebx, ecx, edx;
 648
 649         cpuid(op, &eax, &ebx, &ecx, &edx);
 650         return edx;
 651 }
 652
 653 /* generic versions from gas */
 654 #define GENERIC_NOP1    ".byte 0x90\n"
 655 #define GENERIC_NOP2            ".byte 0x89,0xf6\n"
 656 #define GENERIC_NOP3        ".byte 0x8d,0x76,0x00\n"
 657 #define GENERIC_NOP4        ".byte 0x8d,0x74,0x26,0x00\n"
 658 #define GENERIC_NOP5        GENERIC_NOP1 GENERIC_NOP4
 659 #define GENERIC_NOP6    ".byte 0x8d,0xb6,0x00,0x00,0x00,0x00\n"
 660 #define GENERIC_NOP7    ".byte 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00\n"
 661 #define GENERIC_NOP8    GENERIC_NOP1 GENERIC_NOP7
 662
 663 /* Opteron nops */
 664 #define K8_NOP1 GENERIC_NOP1
 665 #define K8_NOP2 ".byte 0x66,0x90\n"
 666 #define K8_NOP3 ".byte 0x66,0x66,0x90\n"
 667 #define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n"
 668 #define K8_NOP5 K8_NOP3 K8_NOP2
 669 #define K8_NOP6 K8_NOP3 K8_NOP3
 670 #define K8_NOP7 K8_NOP4 K8_NOP3
 671 #define K8_NOP8 K8_NOP4 K8_NOP4
 672
 673 /* K7 nops */
 674 /* uses eax dependencies (arbitary choice) */
 675 #define K7_NOP1  GENERIC_NOP1
 676 #define K7_NOP2 ".byte 0x8b,0xc0\n"
 677 #define K7_NOP3 ".byte 0x8d,0x04,0x20\n"
 678 #define K7_NOP4 ".byte 0x8d,0x44,0x20,0x00\n"
 679 #define K7_NOP5 K7_NOP4 ASM_NOP1
 680 #define K7_NOP6 ".byte 0x8d,0x80,0,0,0,0\n"
 681 #define K7_NOP7        ".byte 0x8D,0x04,0x05,0,0,0,0\n"
 682 #define K7_NOP8        K7_NOP7 ASM_NOP1
 683
 684 #ifdef CONFIG_MK8
 685 #define ASM_NOP1 K8_NOP1
 686 #define ASM_NOP2 K8_NOP2
 687 #define ASM_NOP3 K8_NOP3
 688 #define ASM_NOP4 K8_NOP4
 689 #define ASM_NOP5 K8_NOP5
 690 #define ASM_NOP6 K8_NOP6
 691 #define ASM_NOP7 K8_NOP7
 692 #define ASM_NOP8 K8_NOP8
 693 #elif defined(CONFIG_MK7)
 694 #define ASM_NOP1 K7_NOP1
 695 #define ASM_NOP2 K7_NOP2
 696 #define ASM_NOP3 K7_NOP3
 697 #define ASM_NOP4 K7_NOP4
 698 #define ASM_NOP5 K7_NOP5
 699 #define ASM_NOP6 K7_NOP6
 700 #define ASM_NOP7 K7_NOP7
 701 #define ASM_NOP8 K7_NOP8
 702 #else
 703 #define ASM_NOP1 GENERIC_NOP1
 704 #define ASM_NOP2 GENERIC_NOP2
 705 #define ASM_NOP3 GENERIC_NOP3
 706 #define ASM_NOP4 GENERIC_NOP4
 707 #define ASM_NOP5 GENERIC_NOP5
 708 #define ASM_NOP6 GENERIC_NOP6
 709 #define ASM_NOP7 GENERIC_NOP7
 710 #define ASM_NOP8 GENERIC_NOP8
 711 #endif
 712
 713 #define ASM_NOP_MAX 8
 714
 715 /* Prefetch instructions for Pentium III and AMD Athlon */
 716 /* It's not worth to care about 3dnow! prefetches for the K6
 717    because they are microcoded there and very slow.
 718    However we don't do prefetches for pre XP Athlons currently
 719    That should be fixed. */
 720 #define ARCH_HAS_PREFETCH
 721 static inline void prefetch(const void *x)
 722 {
 723         alternative_input(ASM_NOP4,
 724                           "prefetchnta (%1)",
 725                           X86_FEATURE_XMM,
 726                           "r" (x));
 727 }
 728
 729 #define ARCH_HAS_PREFETCH
 730 #define ARCH_HAS_PREFETCHW
 731 #define ARCH_HAS_SPINLOCK_PREFETCH
 732
 733 /* 3dnow! prefetch to get an exclusive cache line. Useful for
 734    spinlocks to avoid one state transition in the cache coherency protocol. */
 735 static inline void prefetchw(const void *x)
 736 {
 737         alternative_input(ASM_NOP4,
 738                           "prefetchw (%1)",
 739                           X86_FEATURE_3DNOW,
 740                           "r" (x));
 741 }
 742 #define spin_lock_prefetch(x)   prefetchw(x)
 743
 744 extern void select_idle_routine(const struct cpuinfo_x86 *c);
 745
 746 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
 747
 748 extern unsigned long boot_option_idle_override;
 749 extern void enable_sep_cpu(void);
 750 extern int sysenter_setup(void);
 751
 752 /* Defined in head.S */
 753 extern struct Xgt_desc_struct early_gdt_descr;
 754
 755 extern void cpu_set_gdt(int);
 756 extern void switch_to_new_gdt(void);
 757 extern void cpu_init(void);
 758 extern void init_gdt(int cpu);
 759
 760 extern int force_mwait;
 761
 762 #endif /* __ASM_I386_PROCESSOR_H */