include/asm-x86/processor_32.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_TRANSMETA 7
  92 #define X86_VENDOR_NSC 8
  93 #define X86_VENDOR_NUM 9
  94 #define X86_VENDOR_UNKNOWN 0xff
  95
  96 /*
  97  * capabilities of CPUs
  98  */
  99
 100 extern struct cpuinfo_x86 boot_cpu_data;
 101 extern struct cpuinfo_x86 new_cpu_data;
 102 extern struct tss_struct doublefault_tss;
 103 DECLARE_PER_CPU(struct tss_struct, init_tss);
 104
 105 #ifdef CONFIG_SMP
 106 extern struct cpuinfo_x86 cpu_data[];
 107 #define current_cpu_data cpu_data[smp_processor_id()]
 108 #else
 109 #define cpu_data (&boot_cpu_data)
 110 #define current_cpu_data boot_cpu_data
 111 #endif
 112
 113 extern  int cpu_llc_id[NR_CPUS];
 114 extern char ignore_fpu_irq;
 115
 116 void __init cpu_detect(struct cpuinfo_x86 *c);
 117
 118 extern void identify_boot_cpu(void);
 119 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
 120 extern void print_cpu_info(struct cpuinfo_x86 *);
 121 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
 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 /* Stop speculative execution */
 172 static inline void sync_core(void)
 173 {
 174         int tmp;
 175         asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx","ecx","edx","memory");
 176 }
 177
 178 static inline void __monitor(const void *eax, unsigned long ecx,
 179                 unsigned long edx)
 180 {
 181         /* "monitor %eax,%ecx,%edx;" */
 182         asm volatile(
 183                 ".byte 0x0f,0x01,0xc8;"
 184                 : :"a" (eax), "c" (ecx), "d"(edx));
 185 }
 186
 187 static inline void __mwait(unsigned long eax, unsigned long ecx)
 188 {
 189         /* "mwait %eax,%ecx;" */
 190         asm volatile(
 191                 ".byte 0x0f,0x01,0xc9;"
 192                 : :"a" (eax), "c" (ecx));
 193 }
 194
 195 extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx);
 196
 197 /* from system description table in BIOS.  Mostly for MCA use, but
 198 others may find it useful. */
 199 extern unsigned int machine_id;
 200 extern unsigned int machine_submodel_id;
 201 extern unsigned int BIOS_revision;
 202 extern unsigned int mca_pentium_flag;
 203
 204 /* Boot loader type from the setup header */
 205 extern int bootloader_type;
 206
 207 /*
 208  * User space process size: 3GB (default).
 209  */
 210 #define TASK_SIZE       (PAGE_OFFSET)
 211
 212 /* This decides where the kernel will search for a free chunk of vm
 213  * space during mmap's.
 214  */
 215 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
 216
 217 #define HAVE_ARCH_PICK_MMAP_LAYOUT
 218
 219 extern void hard_disable_TSC(void);
 220 extern void disable_TSC(void);
 221 extern void hard_enable_TSC(void);
 222
 223 /*
 224  * Size of io_bitmap.
 225  */
 226 #define IO_BITMAP_BITS  65536
 227 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
 228 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
 229 #define IO_BITMAP_OFFSET offsetof(struct tss_struct,io_bitmap)
 230 #define INVALID_IO_BITMAP_OFFSET 0x8000
 231 #define INVALID_IO_BITMAP_OFFSET_LAZY 0x9000
 232
 233 struct i387_fsave_struct {
 234         long    cwd;
 235         long    swd;
 236         long    twd;
 237         long    fip;
 238         long    fcs;
 239         long    foo;
 240         long    fos;
 241         long    st_space[20];   /* 8*10 bytes for each FP-reg = 80 bytes */
 242         long    status;         /* software status information */
 243 };
 244
 245 struct i387_fxsave_struct {
 246         unsigned short  cwd;
 247         unsigned short  swd;
 248         unsigned short  twd;
 249         unsigned short  fop;
 250         long    fip;
 251         long    fcs;
 252         long    foo;
 253         long    fos;
 254         long    mxcsr;
 255         long    mxcsr_mask;
 256         long    st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
 257         long    xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
 258         long    padding[56];
 259 } __attribute__ ((aligned (16)));
 260
 261 struct i387_soft_struct {
 262         long    cwd;
 263         long    swd;
 264         long    twd;
 265         long    fip;
 266         long    fcs;
 267         long    foo;
 268         long    fos;
 269         long    st_space[20];   /* 8*10 bytes for each FP-reg = 80 bytes */
 270         unsigned char   ftop, changed, lookahead, no_update, rm, alimit;
 271         struct info     *info;
 272         unsigned long   entry_eip;
 273 };
 274
 275 union i387_union {
 276         struct i387_fsave_struct        fsave;
 277         struct i387_fxsave_struct       fxsave;
 278         struct i387_soft_struct soft;
 279 };
 280
 281 typedef struct {
 282         unsigned long seg;
 283 } mm_segment_t;
 284
 285 struct thread_struct;
 286
 287 /* This is the TSS defined by the hardware. */
 288 struct i386_hw_tss {
 289         unsigned short  back_link,__blh;
 290         unsigned long   esp0;
 291         unsigned short  ss0,__ss0h;
 292         unsigned long   esp1;
 293         unsigned short  ss1,__ss1h;     /* ss1 is used to cache MSR_IA32_SYSENTER_CS */
 294         unsigned long   esp2;
 295         unsigned short  ss2,__ss2h;
 296         unsigned long   __cr3;
 297         unsigned long   eip;
 298         unsigned long   eflags;
 299         unsigned long   eax,ecx,edx,ebx;
 300         unsigned long   esp;
 301         unsigned long   ebp;
 302         unsigned long   esi;
 303         unsigned long   edi;
 304         unsigned short  es, __esh;
 305         unsigned short  cs, __csh;
 306         unsigned short  ss, __ssh;
 307         unsigned short  ds, __dsh;
 308         unsigned short  fs, __fsh;
 309         unsigned short  gs, __gsh;
 310         unsigned short  ldt, __ldth;
 311         unsigned short  trace, io_bitmap_base;
 312 } __attribute__((packed));
 313
 314 struct tss_struct {
 315         struct i386_hw_tss x86_tss;
 316
 317         /*
 318          * The extra 1 is there because the CPU will access an
 319          * additional byte beyond the end of the IO permission
 320          * bitmap. The extra byte must be all 1 bits, and must
 321          * be within the limit.
 322          */
 323         unsigned long   io_bitmap[IO_BITMAP_LONGS + 1];
 324         /*
 325          * Cache the current maximum and the last task that used the bitmap:
 326          */
 327         unsigned long io_bitmap_max;
 328         struct thread_struct *io_bitmap_owner;
 329         /*
 330          * pads the TSS to be cacheline-aligned (size is 0x100)
 331          */
 332         unsigned long __cacheline_filler[35];
 333         /*
 334          * .. and then another 0x100 bytes for emergency kernel stack
 335          */
 336         unsigned long stack[64];
 337 } __attribute__((packed));
 338
 339 #define ARCH_MIN_TASKALIGN      16
 340
 341 struct thread_struct {
 342 /* cached TLS descriptors. */
 343         struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
 344         unsigned long   esp0;
 345         unsigned long   sysenter_cs;
 346         unsigned long   eip;
 347         unsigned long   esp;
 348         unsigned long   fs;
 349         unsigned long   gs;
 350 /* Hardware debugging registers */
 351         unsigned long   debugreg[8];  /* %%db0-7 debug registers */
 352 /* fault info */
 353         unsigned long   cr2, trap_no, error_code;
 354 /* floating point info */
 355         union i387_union        i387;
 356 /* virtual 86 mode info */
 357         struct vm86_struct __user * vm86_info;
 358         unsigned long           screen_bitmap;
 359         unsigned long           v86flags, v86mask, saved_esp0;
 360         unsigned int            saved_fs, saved_gs;
 361 /* IO permissions */
 362         unsigned long   *io_bitmap_ptr;
 363         unsigned long   iopl;
 364 /* max allowed port in the bitmap, in bytes: */
 365         unsigned long   io_bitmap_max;
 366 };
 367
 368 #define INIT_THREAD  {                                                  \
 369         .esp0 = sizeof(init_stack) + (long)&init_stack,                 \
 370         .vm86_info = NULL,                                              \
 371         .sysenter_cs = __KERNEL_CS,                                     \
 372         .io_bitmap_ptr = NULL,                                          \
 373         .fs = __KERNEL_PERCPU,                                          \
 374 }
 375
 376 /*
 377  * Note that the .io_bitmap member must be extra-big. This is because
 378  * the CPU will access an additional byte beyond the end of the IO
 379  * permission bitmap. The extra byte must be all 1 bits, and must
 380  * be within the limit.
 381  */
 382 #define INIT_TSS  {                                                     \
 383         .x86_tss = {                                                    \
 384                 .esp0           = sizeof(init_stack) + (long)&init_stack, \
 385                 .ss0            = __KERNEL_DS,                          \
 386                 .ss1            = __KERNEL_CS,                          \
 387                 .io_bitmap_base = INVALID_IO_BITMAP_OFFSET,             \
 388          },                                                             \
 389         .io_bitmap      = { [ 0 ... IO_BITMAP_LONGS] = ~0 },            \
 390 }
 391
 392 #define start_thread(regs, new_eip, new_esp) do {               \
 393         __asm__("movl %0,%%gs": :"r" (0));                      \
 394         regs->xfs = 0;                                          \
 395         set_fs(USER_DS);                                        \
 396         regs->xds = __USER_DS;                                  \
 397         regs->xes = __USER_DS;                                  \
 398         regs->xss = __USER_DS;                                  \
 399         regs->xcs = __USER_CS;                                  \
 400         regs->eip = new_eip;                                    \
 401         regs->esp = new_esp;                                    \
 402 } while (0)
 403
 404 /* Forward declaration, a strange C thing */
 405 struct task_struct;
 406 struct mm_struct;
 407
 408 /* Free all resources held by a thread. */
 409 extern void release_thread(struct task_struct *);
 410
 411 /* Prepare to copy thread state - unlazy all lazy status */
 412 extern void prepare_to_copy(struct task_struct *tsk);
 413
 414 /*
 415  * create a kernel thread without removing it from tasklists
 416  */
 417 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 418
 419 extern unsigned long thread_saved_pc(struct task_struct *tsk);
 420 void show_trace(struct task_struct *task, struct pt_regs *regs, unsigned long *stack);
 421
 422 unsigned long get_wchan(struct task_struct *p);
 423
 424 #define THREAD_SIZE_LONGS      (THREAD_SIZE/sizeof(unsigned long))
 425 #define KSTK_TOP(info)                                                 \
 426 ({                                                                     \
 427        unsigned long *__ptr = (unsigned long *)(info);                 \
 428        (unsigned long)(&__ptr[THREAD_SIZE_LONGS]);                     \
 429 })
 430
 431 /*
 432  * The below -8 is to reserve 8 bytes on top of the ring0 stack.
 433  * This is necessary to guarantee that the entire "struct pt_regs"
 434  * is accessable even if the CPU haven't stored the SS/ESP registers
 435  * on the stack (interrupt gate does not save these registers
 436  * when switching to the same priv ring).
 437  * Therefore beware: accessing the xss/esp fields of the
 438  * "struct pt_regs" is possible, but they may contain the
 439  * completely wrong values.
 440  */
 441 #define task_pt_regs(task)                                             \
 442 ({                                                                     \
 443        struct pt_regs *__regs__;                                       \
 444        __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
 445        __regs__ - 1;                                                   \
 446 })
 447
 448 #define KSTK_EIP(task) (task_pt_regs(task)->eip)
 449 #define KSTK_ESP(task) (task_pt_regs(task)->esp)
 450
 451
 452 struct microcode_header {
 453         unsigned int hdrver;
 454         unsigned int rev;
 455         unsigned int date;
 456         unsigned int sig;
 457         unsigned int cksum;
 458         unsigned int ldrver;
 459         unsigned int pf;
 460         unsigned int datasize;
 461         unsigned int totalsize;
 462         unsigned int reserved[3];
 463 };
 464
 465 struct microcode {
 466         struct microcode_header hdr;
 467         unsigned int bits[0];
 468 };
 469
 470 typedef struct microcode microcode_t;
 471 typedef struct microcode_header microcode_header_t;
 472
 473 /* microcode format is extended from prescott processors */
 474 struct extended_signature {
 475         unsigned int sig;
 476         unsigned int pf;
 477         unsigned int cksum;
 478 };
 479
 480 struct extended_sigtable {
 481         unsigned int count;
 482         unsigned int cksum;
 483         unsigned int reserved[3];
 484         struct extended_signature sigs[0];
 485 };
 486
 487 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
 488 static inline void rep_nop(void)
 489 {
 490         __asm__ __volatile__("rep;nop": : :"memory");
 491 }
 492
 493 #define cpu_relax()     rep_nop()
 494
 495 static inline void native_load_esp0(struct tss_struct *tss, struct thread_struct *thread)
 496 {
 497         tss->x86_tss.esp0 = thread->esp0;
 498         /* This can only happen when SEP is enabled, no need to test "SEP"arately */
 499         if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) {
 500                 tss->x86_tss.ss1 = thread->sysenter_cs;
 501                 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
 502         }
 503 }
 504
 505
 506 static inline unsigned long native_get_debugreg(int regno)
 507 {
 508         unsigned long val = 0;  /* Damn you, gcc! */
 509
 510         switch (regno) {
 511         case 0:
 512                 asm("movl %%db0, %0" :"=r" (val)); break;
 513         case 1:
 514                 asm("movl %%db1, %0" :"=r" (val)); break;
 515         case 2:
 516                 asm("movl %%db2, %0" :"=r" (val)); break;
 517         case 3:
 518                 asm("movl %%db3, %0" :"=r" (val)); break;
 519         case 6:
 520                 asm("movl %%db6, %0" :"=r" (val)); break;
 521         case 7:
 522                 asm("movl %%db7, %0" :"=r" (val)); break;
 523         default:
 524                 BUG();
 525         }
 526         return val;
 527 }
 528
 529 static inline void native_set_debugreg(int regno, unsigned long value)
 530 {
 531         switch (regno) {
 532         case 0:
 533                 asm("movl %0,%%db0"     : /* no output */ :"r" (value));
 534                 break;
 535         case 1:
 536                 asm("movl %0,%%db1"     : /* no output */ :"r" (value));
 537                 break;
 538         case 2:
 539                 asm("movl %0,%%db2"     : /* no output */ :"r" (value));
 540                 break;
 541         case 3:
 542                 asm("movl %0,%%db3"     : /* no output */ :"r" (value));
 543                 break;
 544         case 6:
 545                 asm("movl %0,%%db6"     : /* no output */ :"r" (value));
 546                 break;
 547         case 7:
 548                 asm("movl %0,%%db7"     : /* no output */ :"r" (value));
 549                 break;
 550         default:
 551                 BUG();
 552         }
 553 }
 554
 555 /*
 556  * Set IOPL bits in EFLAGS from given mask
 557  */
 558 static inline void native_set_iopl_mask(unsigned mask)
 559 {
 560         unsigned int reg;
 561         __asm__ __volatile__ ("pushfl;"
 562                               "popl %0;"
 563                               "andl %1, %0;"
 564                               "orl %2, %0;"
 565                               "pushl %0;"
 566                               "popfl"
 567                                 : "=&r" (reg)
 568                                 : "i" (~X86_EFLAGS_IOPL), "r" (mask));
 569 }
 570
 571 #ifdef CONFIG_PARAVIRT
 572 #include <asm/paravirt.h>
 573 #else
 574 #define paravirt_enabled() 0
 575 #define __cpuid native_cpuid
 576
 577 static inline void load_esp0(struct tss_struct *tss, struct thread_struct *thread)
 578 {
 579         native_load_esp0(tss, thread);
 580 }
 581
 582 /*
 583  * These special macros can be used to get or set a debugging register
 584  */
 585 #define get_debugreg(var, register)                             \
 586         (var) = native_get_debugreg(register)
 587 #define set_debugreg(value, register)                           \
 588         native_set_debugreg(register, value)
 589
 590 #define set_iopl_mask native_set_iopl_mask
 591 #endif /* CONFIG_PARAVIRT */
 592
 593 /*
 594  * Generic CPUID function
 595  * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
 596  * resulting in stale register contents being returned.
 597  */
 598 static inline void cpuid(unsigned int op, unsigned int *eax, unsigned int *ebx, unsigned int *ecx, unsigned int *edx)
 599 {
 600         *eax = op;
 601         *ecx = 0;
 602         __cpuid(eax, ebx, ecx, edx);
 603 }
 604
 605 /* Some CPUID calls want 'count' to be placed in ecx */
 606 static inline void cpuid_count(int op, int count, int *eax, int *ebx, int *ecx,
 607                                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         return eax;
 623 }
 624 static inline unsigned int cpuid_ebx(unsigned int op)
 625 {
 626         unsigned int eax, ebx, ecx, edx;
 627
 628         cpuid(op, &eax, &ebx, &ecx, &edx);
 629         return ebx;
 630 }
 631 static inline unsigned int cpuid_ecx(unsigned int op)
 632 {
 633         unsigned int eax, ebx, ecx, edx;
 634
 635         cpuid(op, &eax, &ebx, &ecx, &edx);
 636         return ecx;
 637 }
 638 static inline unsigned int cpuid_edx(unsigned int op)
 639 {
 640         unsigned int eax, ebx, ecx, edx;
 641
 642         cpuid(op, &eax, &ebx, &ecx, &edx);
 643         return edx;
 644 }
 645
 646 /* generic versions from gas */
 647 #define GENERIC_NOP1    ".byte 0x90\n"
 648 #define GENERIC_NOP2            ".byte 0x89,0xf6\n"
 649 #define GENERIC_NOP3        ".byte 0x8d,0x76,0x00\n"
 650 #define GENERIC_NOP4        ".byte 0x8d,0x74,0x26,0x00\n"
 651 #define GENERIC_NOP5        GENERIC_NOP1 GENERIC_NOP4
 652 #define GENERIC_NOP6    ".byte 0x8d,0xb6,0x00,0x00,0x00,0x00\n"
 653 #define GENERIC_NOP7    ".byte 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00\n"
 654 #define GENERIC_NOP8    GENERIC_NOP1 GENERIC_NOP7
 655
 656 /* Opteron nops */
 657 #define K8_NOP1 GENERIC_NOP1
 658 #define K8_NOP2 ".byte 0x66,0x90\n"
 659 #define K8_NOP3 ".byte 0x66,0x66,0x90\n"
 660 #define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n"
 661 #define K8_NOP5 K8_NOP3 K8_NOP2
 662 #define K8_NOP6 K8_NOP3 K8_NOP3
 663 #define K8_NOP7 K8_NOP4 K8_NOP3
 664 #define K8_NOP8 K8_NOP4 K8_NOP4
 665
 666 /* K7 nops */
 667 /* uses eax dependencies (arbitary choice) */
 668 #define K7_NOP1  GENERIC_NOP1
 669 #define K7_NOP2 ".byte 0x8b,0xc0\n"
 670 #define K7_NOP3 ".byte 0x8d,0x04,0x20\n"
 671 #define K7_NOP4 ".byte 0x8d,0x44,0x20,0x00\n"
 672 #define K7_NOP5 K7_NOP4 ASM_NOP1
 673 #define K7_NOP6 ".byte 0x8d,0x80,0,0,0,0\n"
 674 #define K7_NOP7        ".byte 0x8D,0x04,0x05,0,0,0,0\n"
 675 #define K7_NOP8        K7_NOP7 ASM_NOP1
 676
 677 #ifdef CONFIG_MK8
 678 #define ASM_NOP1 K8_NOP1
 679 #define ASM_NOP2 K8_NOP2
 680 #define ASM_NOP3 K8_NOP3
 681 #define ASM_NOP4 K8_NOP4
 682 #define ASM_NOP5 K8_NOP5
 683 #define ASM_NOP6 K8_NOP6
 684 #define ASM_NOP7 K8_NOP7
 685 #define ASM_NOP8 K8_NOP8
 686 #elif defined(CONFIG_MK7)
 687 #define ASM_NOP1 K7_NOP1
 688 #define ASM_NOP2 K7_NOP2
 689 #define ASM_NOP3 K7_NOP3
 690 #define ASM_NOP4 K7_NOP4
 691 #define ASM_NOP5 K7_NOP5
 692 #define ASM_NOP6 K7_NOP6
 693 #define ASM_NOP7 K7_NOP7
 694 #define ASM_NOP8 K7_NOP8
 695 #else
 696 #define ASM_NOP1 GENERIC_NOP1
 697 #define ASM_NOP2 GENERIC_NOP2
 698 #define ASM_NOP3 GENERIC_NOP3
 699 #define ASM_NOP4 GENERIC_NOP4
 700 #define ASM_NOP5 GENERIC_NOP5
 701 #define ASM_NOP6 GENERIC_NOP6
 702 #define ASM_NOP7 GENERIC_NOP7
 703 #define ASM_NOP8 GENERIC_NOP8
 704 #endif
 705
 706 #define ASM_NOP_MAX 8
 707
 708 /* Prefetch instructions for Pentium III and AMD Athlon */
 709 /* It's not worth to care about 3dnow! prefetches for the K6
 710    because they are microcoded there and very slow.
 711    However we don't do prefetches for pre XP Athlons currently
 712    That should be fixed. */
 713 #define ARCH_HAS_PREFETCH
 714 static inline void prefetch(const void *x)
 715 {
 716         alternative_input(ASM_NOP4,
 717                           "prefetchnta (%1)",
 718                           X86_FEATURE_XMM,
 719                           "r" (x));
 720 }
 721
 722 #define ARCH_HAS_PREFETCH
 723 #define ARCH_HAS_PREFETCHW
 724 #define ARCH_HAS_SPINLOCK_PREFETCH
 725
 726 /* 3dnow! prefetch to get an exclusive cache line. Useful for
 727    spinlocks to avoid one state transition in the cache coherency protocol. */
 728 static inline void prefetchw(const void *x)
 729 {
 730         alternative_input(ASM_NOP4,
 731                           "prefetchw (%1)",
 732                           X86_FEATURE_3DNOW,
 733                           "r" (x));
 734 }
 735 #define spin_lock_prefetch(x)   prefetchw(x)
 736
 737 extern void select_idle_routine(const struct cpuinfo_x86 *c);
 738
 739 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
 740
 741 extern unsigned long boot_option_idle_override;
 742 extern void enable_sep_cpu(void);
 743 extern int sysenter_setup(void);
 744
 745 /* Defined in head.S */
 746 extern struct Xgt_desc_struct early_gdt_descr;
 747
 748 extern void cpu_set_gdt(int);
 749 extern void switch_to_new_gdt(void);
 750 extern void cpu_init(void);
 751 extern void init_gdt(int cpu);
 752
 753 extern int force_mwait;
 754
 755 #endif /* __ASM_I386_PROCESSOR_H */