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_TRANSMETA 7
  87 #define X86_VENDOR_NUM 8
  88 #define X86_VENDOR_UNKNOWN 0xff
  89
  90 #ifdef CONFIG_SMP
  91 extern struct cpuinfo_x86 cpu_data[];
  92 #define current_cpu_data cpu_data[smp_processor_id()]
  93 #else
  94 #define cpu_data (&boot_cpu_data)
  95 #define current_cpu_data boot_cpu_data
  96 #endif
  97
  98 extern char ignore_irq13;
  99
 100 extern void identify_cpu(struct cpuinfo_x86 *);
 101 extern void print_cpu_info(struct cpuinfo_x86 *);
 102 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
 103 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
 104 extern unsigned short num_cache_leaves;
 105
 106 /*
 107  * Save the cr4 feature set we're using (ie
 108  * Pentium 4MB enable and PPro Global page
 109  * enable), so that any CPU's that boot up
 110  * after us can get the correct flags.
 111  */
 112 extern unsigned long mmu_cr4_features;
 113
 114 static inline void set_in_cr4 (unsigned long mask)
 115 {
 116         mmu_cr4_features |= mask;
 117         __asm__("movq %%cr4,%%rax\n\t"
 118                 "orq %0,%%rax\n\t"
 119                 "movq %%rax,%%cr4\n"
 120                 : : "irg" (mask)
 121                 :"ax");
 122 }
 123
 124 static inline void clear_in_cr4 (unsigned long mask)
 125 {
 126         mmu_cr4_features &= ~mask;
 127         __asm__("movq %%cr4,%%rax\n\t"
 128                 "andq %0,%%rax\n\t"
 129                 "movq %%rax,%%cr4\n"
 130                 : : "irg" (~mask)
 131                 :"ax");
 132 }
 133
 134
 135 /*
 136  * User space process size. 47bits minus one guard page.
 137  */
 138 #define TASK_SIZE64     (0x800000000000UL - 4096)
 139
 140 /* This decides where the kernel will search for a free chunk of vm
 141  * space during mmap's.
 142  */
 143 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? 0xc0000000 : 0xFFFFe000)
 144
 145 #define TASK_SIZE               (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE64)
 146 #define TASK_SIZE_OF(child)     ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
 147
 148 #define TASK_UNMAPPED_BASE      PAGE_ALIGN(TASK_SIZE/3)
 149
 150 /*
 151  * Size of io_bitmap.
 152  */
 153 #define IO_BITMAP_BITS  65536
 154 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
 155 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
 156 #define IO_BITMAP_OFFSET offsetof(struct tss_struct,io_bitmap)
 157 #define INVALID_IO_BITMAP_OFFSET 0x8000
 158
 159 struct i387_fxsave_struct {
 160         u16     cwd;
 161         u16     swd;
 162         u16     twd;
 163         u16     fop;
 164         u64     rip;
 165         u64     rdp;
 166         u32     mxcsr;
 167         u32     mxcsr_mask;
 168         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
 169         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
 170         u32     padding[24];
 171 } __attribute__ ((aligned (16)));
 172
 173 union i387_union {
 174         struct i387_fxsave_struct       fxsave;
 175 };
 176
 177 struct tss_struct {
 178         u32 reserved1;
 179         u64 rsp0;
 180         u64 rsp1;
 181         u64 rsp2;
 182         u64 reserved2;
 183         u64 ist[7];
 184         u32 reserved3;
 185         u32 reserved4;
 186         u16 reserved5;
 187         u16 io_bitmap_base;
 188         /*
 189          * The extra 1 is there because the CPU will access an
 190          * additional byte beyond the end of the IO permission
 191          * bitmap. The extra byte must be all 1 bits, and must
 192          * be within the limit. Thus we have:
 193          *
 194          * 128 bytes, the bitmap itself, for ports 0..0x3ff
 195          * 8 bytes, for an extra "long" of ~0UL
 196          */
 197         unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
 198 } __attribute__((packed)) ____cacheline_aligned;
 199
 200
 201 extern struct cpuinfo_x86 boot_cpu_data;
 202 DECLARE_PER_CPU(struct tss_struct,init_tss);
 203 /* Save the original ist values for checking stack pointers during debugging */
 204 struct orig_ist {
 205         unsigned long ist[7];
 206 };
 207 DECLARE_PER_CPU(struct orig_ist, orig_ist);
 208
 209 #ifdef CONFIG_X86_VSMP
 210 #define ARCH_MIN_TASKALIGN      (1 << INTERNODE_CACHE_SHIFT)
 211 #define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
 212 #else
 213 #define ARCH_MIN_TASKALIGN      16
 214 #define ARCH_MIN_MMSTRUCT_ALIGN 0
 215 #endif
 216
 217 struct thread_struct {
 218         unsigned long   rsp0;
 219         unsigned long   rsp;
 220         unsigned long   userrsp;        /* Copy from PDA */
 221         unsigned long   fs;
 222         unsigned long   gs;
 223         unsigned short  es, ds, fsindex, gsindex;
 224 /* Hardware debugging registers */
 225         unsigned long   debugreg0;
 226         unsigned long   debugreg1;
 227         unsigned long   debugreg2;
 228         unsigned long   debugreg3;
 229         unsigned long   debugreg6;
 230         unsigned long   debugreg7;
 231 /* fault info */
 232         unsigned long   cr2, trap_no, error_code;
 233 /* floating point info */
 234         union i387_union        i387  __attribute__((aligned(16)));
 235 /* IO permissions. the bitmap could be moved into the GDT, that would make
 236    switch faster for a limited number of ioperm using tasks. -AK */
 237         int             ioperm;
 238         unsigned long   *io_bitmap_ptr;
 239         unsigned io_bitmap_max;
 240 /* cached TLS descriptors. */
 241         u64 tls_array[GDT_ENTRY_TLS_ENTRIES];
 242 } __attribute__((aligned(16)));
 243
 244 #define INIT_THREAD  { \
 245         .rsp0 = (unsigned long)&init_stack + sizeof(init_stack) \
 246 }
 247
 248 #define INIT_TSS  { \
 249         .rsp0 = (unsigned long)&init_stack + sizeof(init_stack) \
 250 }
 251
 252 #define INIT_MMAP \
 253 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
 254
 255 #define start_thread(regs,new_rip,new_rsp) do { \
 256         asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0));      \
 257         load_gs_index(0);                                                       \
 258         (regs)->rip = (new_rip);                                                 \
 259         (regs)->rsp = (new_rsp);                                                 \
 260         write_pda(oldrsp, (new_rsp));                                            \
 261         (regs)->cs = __USER_CS;                                                  \
 262         (regs)->ss = __USER_DS;                                                  \
 263         (regs)->eflags = 0x200;                                                  \
 264         set_fs(USER_DS);                                                         \
 265 } while(0)
 266
 267 #define get_debugreg(var, register)                             \
 268                 __asm__("movq %%db" #register ", %0"            \
 269                         :"=r" (var))
 270 #define set_debugreg(value, register)                   \
 271                 __asm__("movq %0,%%db" #register                \
 272                         : /* no output */                       \
 273                         :"r" (value))
 274
 275 struct task_struct;
 276 struct mm_struct;
 277
 278 /* Free all resources held by a thread. */
 279 extern void release_thread(struct task_struct *);
 280
 281 /* Prepare to copy thread state - unlazy all lazy status */
 282 extern void prepare_to_copy(struct task_struct *tsk);
 283
 284 /*
 285  * create a kernel thread without removing it from tasklists
 286  */
 287 extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 288
 289 /*
 290  * Return saved PC of a blocked thread.
 291  * What is this good for? it will be always the scheduler or ret_from_fork.
 292  */
 293 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.rsp - 8))
 294
 295 extern unsigned long get_wchan(struct task_struct *p);
 296 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.rsp0 - 1)
 297 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->rip)
 298 #define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
 299
 300
 301 struct microcode_header {
 302         unsigned int hdrver;
 303         unsigned int rev;
 304         unsigned int date;
 305         unsigned int sig;
 306         unsigned int cksum;
 307         unsigned int ldrver;
 308         unsigned int pf;
 309         unsigned int datasize;
 310         unsigned int totalsize;
 311         unsigned int reserved[3];
 312 };
 313
 314 struct microcode {
 315         struct microcode_header hdr;
 316         unsigned int bits[0];
 317 };
 318
 319 typedef struct microcode microcode_t;
 320 typedef struct microcode_header microcode_header_t;
 321
 322 /* microcode format is extended from prescott processors */
 323 struct extended_signature {
 324         unsigned int sig;
 325         unsigned int pf;
 326         unsigned int cksum;
 327 };
 328
 329 struct extended_sigtable {
 330         unsigned int count;
 331         unsigned int cksum;
 332         unsigned int reserved[3];
 333         struct extended_signature sigs[0];
 334 };
 335
 336
 337 #define ASM_NOP1 K8_NOP1
 338 #define ASM_NOP2 K8_NOP2
 339 #define ASM_NOP3 K8_NOP3
 340 #define ASM_NOP4 K8_NOP4
 341 #define ASM_NOP5 K8_NOP5
 342 #define ASM_NOP6 K8_NOP6
 343 #define ASM_NOP7 K8_NOP7
 344 #define ASM_NOP8 K8_NOP8
 345
 346 /* Opteron nops */
 347 #define K8_NOP1 ".byte 0x90\n"
 348 #define K8_NOP2 ".byte 0x66,0x90\n"
 349 #define K8_NOP3 ".byte 0x66,0x66,0x90\n"
 350 #define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n"
 351 #define K8_NOP5 K8_NOP3 K8_NOP2
 352 #define K8_NOP6 K8_NOP3 K8_NOP3
 353 #define K8_NOP7 K8_NOP4 K8_NOP3
 354 #define K8_NOP8 K8_NOP4 K8_NOP4
 355
 356 #define ASM_NOP_MAX 8
 357
 358 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
 359 static inline void rep_nop(void)
 360 {
 361         __asm__ __volatile__("rep;nop": : :"memory");
 362 }
 363
 364 /* Stop speculative execution */
 365 static inline void sync_core(void)
 366 {
 367         int tmp;
 368         asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx","ecx","edx","memory");
 369 }
 370
 371 #define ARCH_HAS_PREFETCH
 372 static inline void prefetch(void *x)
 373 {
 374         asm volatile("prefetcht0 (%0)" :: "r" (x));
 375 }
 376
 377 #define ARCH_HAS_PREFETCHW 1
 378 static inline void prefetchw(void *x)
 379 {
 380         alternative_input("prefetcht0 (%1)",
 381                           "prefetchw (%1)",
 382                           X86_FEATURE_3DNOW,
 383                           "r" (x));
 384 }
 385
 386 #define ARCH_HAS_SPINLOCK_PREFETCH 1
 387
 388 #define spin_lock_prefetch(x)  prefetchw(x)
 389
 390 #define cpu_relax()   rep_nop()
 391
 392 static inline void serialize_cpu(void)
 393 {
 394         __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
 395 }
 396
 397 static inline void __monitor(const void *eax, unsigned long ecx,
 398                 unsigned long edx)
 399 {
 400         /* "monitor %eax,%ecx,%edx;" */
 401         asm volatile(
 402                 ".byte 0x0f,0x01,0xc8;"
 403                 : :"a" (eax), "c" (ecx), "d"(edx));
 404 }
 405
 406 static inline void __mwait(unsigned long eax, unsigned long ecx)
 407 {
 408         /* "mwait %eax,%ecx;" */
 409         asm volatile(
 410                 ".byte 0x0f,0x01,0xc9;"
 411                 : :"a" (eax), "c" (ecx));
 412 }
 413
 414 static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
 415 {
 416         /* "mwait %eax,%ecx;" */
 417         asm volatile(
 418                 "sti; .byte 0x0f,0x01,0xc9;"
 419                 : :"a" (eax), "c" (ecx));
 420 }
 421
 422 extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx);
 423
 424 #define stack_current() \
 425 ({                                                              \
 426         struct thread_info *ti;                                 \
 427         asm("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));  \
 428         ti->task;                                       \
 429 })
 430
 431 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
 432
 433 extern unsigned long boot_option_idle_override;
 434 /* Boot loader type from the setup header */
 435 extern int bootloader_type;
 436
 437 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
 438
 439 #endif /* __ASM_X86_64_PROCESSOR_H */