include/asm-x86_64/processor.h

   1 /*
   2  * include/asm-x86_64/processor.h
   3  *
   4  * Copyright (C) 1994 Linus Torvalds
   5  */
   6
   7 #ifndef __ASM_X86_64_PROCESSOR_H
   8 #define __ASM_X86_64_PROCESSOR_H
   9
  10 #include <asm/segment.h>
  11 #include <asm/page.h>
  12 #include <asm/types.h>
  13 #include <asm/sigcontext.h>
  14 #include <asm/cpufeature.h>
  15 #include <linux/threads.h>
  16 #include <asm/msr.h>
  17 #include <asm/current.h>
  18 #include <asm/system.h>
  19 #include <asm/mmsegment.h>
  20 #include <asm/percpu.h>
  21 #include <linux/personality.h>
  22 #include <linux/cpumask.h>
  23 #include <asm/processor-flags.h>
  24
  25 #define TF_MASK         0x00000100
  26 #define IF_MASK         0x00000200
  27 #define IOPL_MASK       0x00003000
  28 #define NT_MASK         0x00004000
  29 #define VM_MASK         0x00020000
  30 #define AC_MASK         0x00040000
  31 #define VIF_MASK        0x00080000      /* virtual interrupt flag */
  32 #define VIP_MASK        0x00100000      /* virtual interrupt pending */
  33 #define ID_MASK         0x00200000
  34
  35 #define desc_empty(desc) \
  36                (!((desc)->a | (desc)->b))
  37
  38 #define desc_equal(desc1, desc2) \
  39                (((desc1)->a == (desc2)->a) && ((desc1)->b == (desc2)->b))
  40
  41 /*
  42  * Default implementation of macro that returns current
  43  * instruction pointer ("program counter").
  44  */
  45 #define current_text_addr() ({ void *pc; asm volatile("leaq 1f(%%rip),%0\n1:":"=r"(pc)); pc; })
  46
  47 /*
  48  *  CPU type and hardware bug flags. Kept separately for each CPU.
  49  */
  50
  51 struct cpuinfo_x86 {
  52         __u8    x86;            /* CPU family */
  53         __u8    x86_vendor;     /* CPU vendor */
  54         __u8    x86_model;
  55         __u8    x86_mask;
  56         int     cpuid_level;    /* Maximum supported CPUID level, -1=no CPUID */
  57         __u32   x86_capability[NCAPINTS];
  58         char    x86_vendor_id[16];
  59         char    x86_model_id[64];
  60         int     x86_cache_size;  /* in KB */
  61         int     x86_clflush_size;
  62         int     x86_cache_alignment;
  63         int     x86_tlbsize;    /* number of 4K pages in DTLB/ITLB combined(in pages)*/
  64         __u8    x86_virt_bits, x86_phys_bits;
  65         __u8    x86_max_cores;  /* cpuid returned max cores value */
  66         __u32   x86_power;
  67         __u32   extended_cpuid_level;   /* Max extended CPUID function supported */
  68         unsigned long loops_per_jiffy;
  69 #ifdef CONFIG_SMP
  70         cpumask_t llc_shared_map;       /* cpus sharing the last level cache */
  71 #endif
  72         __u8    apicid;
  73 #ifdef CONFIG_SMP
  74         __u8    booted_cores;   /* number of cores as seen by OS */
  75         __u8    phys_proc_id;   /* Physical Processor id. */
  76         __u8    cpu_core_id;    /* Core id. */
  77 #endif
  78 } ____cacheline_aligned;
  79
  80 #define X86_VENDOR_INTEL 0
  81 #define X86_VENDOR_CYRIX 1
  82 #define X86_VENDOR_AMD 2
  83 #define X86_VENDOR_UMC 3
  84 #define X86_VENDOR_NEXGEN 4
  85 #define X86_VENDOR_CENTAUR 5
  86 #define X86_VENDOR_RISE 6
  87 #define X86_VENDOR_TRANSMETA 7
  88 #define X86_VENDOR_NUM 8
  89 #define X86_VENDOR_UNKNOWN 0xff
  90
  91 #ifdef CONFIG_SMP
  92 extern struct cpuinfo_x86 cpu_data[];
  93 #define current_cpu_data cpu_data[smp_processor_id()]
  94 #else
  95 #define cpu_data (&boot_cpu_data)
  96 #define current_cpu_data boot_cpu_data
  97 #endif
  98
  99 extern char ignore_irq13;
 100
 101 extern void identify_cpu(struct cpuinfo_x86 *);
 102 extern void print_cpu_info(struct cpuinfo_x86 *);
 103 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
 104 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
 105 extern unsigned short num_cache_leaves;
 106
 107 /*
 108  * Save the cr4 feature set we're using (ie
 109  * Pentium 4MB enable and PPro Global page
 110  * enable), so that any CPU's that boot up
 111  * after us can get the correct flags.
 112  */
 113 extern unsigned long mmu_cr4_features;
 114
 115 static inline void set_in_cr4 (unsigned long mask)
 116 {
 117         mmu_cr4_features |= mask;
 118         __asm__("movq %%cr4,%%rax\n\t"
 119                 "orq %0,%%rax\n\t"
 120                 "movq %%rax,%%cr4\n"
 121                 : : "irg" (mask)
 122                 :"ax");
 123 }
 124
 125 static inline void clear_in_cr4 (unsigned long mask)
 126 {
 127         mmu_cr4_features &= ~mask;
 128         __asm__("movq %%cr4,%%rax\n\t"
 129                 "andq %0,%%rax\n\t"
 130                 "movq %%rax,%%cr4\n"
 131                 : : "irg" (~mask)
 132                 :"ax");
 133 }
 134
 135
 136 /*
 137  * User space process size. 47bits minus one guard page.
 138  */
 139 #define TASK_SIZE64     (0x800000000000UL - 4096)
 140
 141 /* This decides where the kernel will search for a free chunk of vm
 142  * space during mmap's.
 143  */
 144 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? 0xc0000000 : 0xFFFFe000)
 145
 146 #define TASK_SIZE               (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE64)
 147 #define TASK_SIZE_OF(child)     ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
 148
 149 #define TASK_UNMAPPED_BASE      PAGE_ALIGN(TASK_SIZE/3)
 150
 151 /*
 152  * Size of io_bitmap.
 153  */
 154 #define IO_BITMAP_BITS  65536
 155 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
 156 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
 157 #define IO_BITMAP_OFFSET offsetof(struct tss_struct,io_bitmap)
 158 #define INVALID_IO_BITMAP_OFFSET 0x8000
 159
 160 struct i387_fxsave_struct {
 161         u16     cwd;
 162         u16     swd;
 163         u16     twd;
 164         u16     fop;
 165         u64     rip;
 166         u64     rdp;
 167         u32     mxcsr;
 168         u32     mxcsr_mask;
 169         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
 170         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
 171         u32     padding[24];
 172 } __attribute__ ((aligned (16)));
 173
 174 union i387_union {
 175         struct i387_fxsave_struct       fxsave;
 176 };
 177
 178 struct tss_struct {
 179         u32 reserved1;
 180         u64 rsp0;
 181         u64 rsp1;
 182         u64 rsp2;
 183         u64 reserved2;
 184         u64 ist[7];
 185         u32 reserved3;
 186         u32 reserved4;
 187         u16 reserved5;
 188         u16 io_bitmap_base;
 189         /*
 190          * The extra 1 is there because the CPU will access an
 191          * additional byte beyond the end of the IO permission
 192          * bitmap. The extra byte must be all 1 bits, and must
 193          * be within the limit. Thus we have:
 194          *
 195          * 128 bytes, the bitmap itself, for ports 0..0x3ff
 196          * 8 bytes, for an extra "long" of ~0UL
 197          */
 198         unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
 199 } __attribute__((packed)) ____cacheline_aligned;
 200
 201
 202 extern struct cpuinfo_x86 boot_cpu_data;
 203 DECLARE_PER_CPU(struct tss_struct,init_tss);
 204 /* Save the original ist values for checking stack pointers during debugging */
 205 struct orig_ist {
 206         unsigned long ist[7];
 207 };
 208 DECLARE_PER_CPU(struct orig_ist, orig_ist);
 209
 210 #ifdef CONFIG_X86_VSMP
 211 #define ARCH_MIN_TASKALIGN      (1 << INTERNODE_CACHE_SHIFT)
 212 #define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
 213 #else
 214 #define ARCH_MIN_TASKALIGN      16
 215 #define ARCH_MIN_MMSTRUCT_ALIGN 0
 216 #endif
 217
 218 struct thread_struct {
 219         unsigned long   rsp0;
 220         unsigned long   rsp;
 221         unsigned long   userrsp;        /* Copy from PDA */
 222         unsigned long   fs;
 223         unsigned long   gs;
 224         unsigned short  es, ds, fsindex, gsindex;
 225 /* Hardware debugging registers */
 226         unsigned long   debugreg0;
 227         unsigned long   debugreg1;
 228         unsigned long   debugreg2;
 229         unsigned long   debugreg3;
 230         unsigned long   debugreg6;
 231         unsigned long   debugreg7;
 232 /* fault info */
 233         unsigned long   cr2, trap_no, error_code;
 234 /* floating point info */
 235         union i387_union        i387  __attribute__((aligned(16)));
 236 /* IO permissions. the bitmap could be moved into the GDT, that would make
 237    switch faster for a limited number of ioperm using tasks. -AK */
 238         int             ioperm;
 239         unsigned long   *io_bitmap_ptr;
 240         unsigned io_bitmap_max;
 241 /* cached TLS descriptors. */
 242         u64 tls_array[GDT_ENTRY_TLS_ENTRIES];
 243 } __attribute__((aligned(16)));
 244
 245 #define INIT_THREAD  { \
 246         .rsp0 = (unsigned long)&init_stack + sizeof(init_stack) \
 247 }
 248
 249 #define INIT_TSS  { \
 250         .rsp0 = (unsigned long)&init_stack + sizeof(init_stack) \
 251 }
 252
 253 #define INIT_MMAP \
 254 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
 255
 256 #define start_thread(regs,new_rip,new_rsp) do { \
 257         asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0));      \
 258         load_gs_index(0);                                                       \
 259         (regs)->rip = (new_rip);                                                 \
 260         (regs)->rsp = (new_rsp);                                                 \
 261         write_pda(oldrsp, (new_rsp));                                            \
 262         (regs)->cs = __USER_CS;                                                  \
 263         (regs)->ss = __USER_DS;                                                  \
 264         (regs)->eflags = 0x200;                                                  \
 265         set_fs(USER_DS);                                                         \
 266 } while(0)
 267
 268 #define get_debugreg(var, register)                             \
 269                 __asm__("movq %%db" #register ", %0"            \
 270                         :"=r" (var))
 271 #define set_debugreg(value, register)                   \
 272                 __asm__("movq %0,%%db" #register                \
 273                         : /* no output */                       \
 274                         :"r" (value))
 275
 276 struct task_struct;
 277 struct mm_struct;
 278
 279 /* Free all resources held by a thread. */
 280 extern void release_thread(struct task_struct *);
 281
 282 /* Prepare to copy thread state - unlazy all lazy status */
 283 extern void prepare_to_copy(struct task_struct *tsk);
 284
 285 /*
 286  * create a kernel thread without removing it from tasklists
 287  */
 288 extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 289
 290 /*
 291  * Return saved PC of a blocked thread.
 292  * What is this good for? it will be always the scheduler or ret_from_fork.
 293  */
 294 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.rsp - 8))
 295
 296 extern unsigned long get_wchan(struct task_struct *p);
 297 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.rsp0 - 1)
 298 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->rip)
 299 #define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
 300
 301
 302 struct microcode_header {
 303         unsigned int hdrver;
 304         unsigned int rev;
 305         unsigned int date;
 306         unsigned int sig;
 307         unsigned int cksum;
 308         unsigned int ldrver;
 309         unsigned int pf;
 310         unsigned int datasize;
 311         unsigned int totalsize;
 312         unsigned int reserved[3];
 313 };
 314
 315 struct microcode {
 316         struct microcode_header hdr;
 317         unsigned int bits[0];
 318 };
 319
 320 typedef struct microcode microcode_t;
 321 typedef struct microcode_header microcode_header_t;
 322
 323 /* microcode format is extended from prescott processors */
 324 struct extended_signature {
 325         unsigned int sig;
 326         unsigned int pf;
 327         unsigned int cksum;
 328 };
 329
 330 struct extended_sigtable {
 331         unsigned int count;
 332         unsigned int cksum;
 333         unsigned int reserved[3];
 334         struct extended_signature sigs[0];
 335 };
 336
 337
 338 #define ASM_NOP1 K8_NOP1
 339 #define ASM_NOP2 K8_NOP2
 340 #define ASM_NOP3 K8_NOP3
 341 #define ASM_NOP4 K8_NOP4
 342 #define ASM_NOP5 K8_NOP5
 343 #define ASM_NOP6 K8_NOP6
 344 #define ASM_NOP7 K8_NOP7
 345 #define ASM_NOP8 K8_NOP8
 346
 347 /* Opteron nops */
 348 #define K8_NOP1 ".byte 0x90\n"
 349 #define K8_NOP2 ".byte 0x66,0x90\n"
 350 #define K8_NOP3 ".byte 0x66,0x66,0x90\n"
 351 #define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n"
 352 #define K8_NOP5 K8_NOP3 K8_NOP2
 353 #define K8_NOP6 K8_NOP3 K8_NOP3
 354 #define K8_NOP7 K8_NOP4 K8_NOP3
 355 #define K8_NOP8 K8_NOP4 K8_NOP4
 356
 357 #define ASM_NOP_MAX 8
 358
 359 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
 360 static inline void rep_nop(void)
 361 {
 362         __asm__ __volatile__("rep;nop": : :"memory");
 363 }
 364
 365 /* Stop speculative execution */
 366 static inline void sync_core(void)
 367 {
 368         int tmp;
 369         asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx","ecx","edx","memory");
 370 }
 371
 372 #define ARCH_HAS_PREFETCH
 373 static inline void prefetch(void *x)
 374 {
 375         asm volatile("prefetcht0 %0" :: "m" (*(unsigned long *)x));
 376 }
 377
 378 #define ARCH_HAS_PREFETCHW 1
 379 static inline void prefetchw(void *x)
 380 {
 381         alternative_input("prefetcht0 (%1)",
 382                           "prefetchw (%1)",
 383                           X86_FEATURE_3DNOW,
 384                           "r" (x));
 385 }
 386
 387 #define ARCH_HAS_SPINLOCK_PREFETCH 1
 388
 389 #define spin_lock_prefetch(x)  prefetchw(x)
 390
 391 #define cpu_relax()   rep_nop()
 392
 393 /*
 394  *      NSC/Cyrix CPU indexed register access macros
 395  */
 396
 397 #define getCx86(reg) ({ outb((reg), 0x22); inb(0x23); })
 398
 399 #define setCx86(reg, data) do { \
 400         outb((reg), 0x22); \
 401         outb((data), 0x23); \
 402 } while (0)
 403
 404 static inline void serialize_cpu(void)
 405 {
 406         __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
 407 }
 408
 409 static inline void __monitor(const void *eax, unsigned long ecx,
 410                 unsigned long edx)
 411 {
 412         /* "monitor %eax,%ecx,%edx;" */
 413         asm volatile(
 414                 ".byte 0x0f,0x01,0xc8;"
 415                 : :"a" (eax), "c" (ecx), "d"(edx));
 416 }
 417
 418 static inline void __mwait(unsigned long eax, unsigned long ecx)
 419 {
 420         /* "mwait %eax,%ecx;" */
 421         asm volatile(
 422                 ".byte 0x0f,0x01,0xc9;"
 423                 : :"a" (eax), "c" (ecx));
 424 }
 425
 426 static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
 427 {
 428         /* "mwait %eax,%ecx;" */
 429         asm volatile(
 430                 "sti; .byte 0x0f,0x01,0xc9;"
 431                 : :"a" (eax), "c" (ecx));
 432 }
 433
 434 extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx);
 435
 436 #define stack_current() \
 437 ({                                                              \
 438         struct thread_info *ti;                                 \
 439         asm("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));  \
 440         ti->task;                                       \
 441 })
 442
 443 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
 444
 445 extern unsigned long boot_option_idle_override;
 446 /* Boot loader type from the setup header */
 447 extern int bootloader_type;
 448
 449 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
 450
 451 #endif /* __ASM_X86_64_PROCESSOR_H */