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/config.h>
  16 #include <linux/threads.h>
  17 #include <asm/msr.h>
  18 #include <asm/current.h>
  19 #include <asm/system.h>
  20 #include <asm/mmsegment.h>
  21 #include <asm/percpu.h>
  22 #include <linux/personality.h>
  23
  24 #define TF_MASK         0x00000100
  25 #define IF_MASK         0x00000200
  26 #define IOPL_MASK       0x00003000
  27 #define NT_MASK         0x00004000
  28 #define VM_MASK         0x00020000
  29 #define AC_MASK         0x00040000
  30 #define VIF_MASK        0x00080000      /* virtual interrupt flag */
  31 #define VIP_MASK        0x00100000      /* virtual interrupt pending */
  32 #define ID_MASK         0x00200000
  33
  34 #define desc_empty(desc) \
  35                (!((desc)->a | (desc)->b))
  36
  37 #define desc_equal(desc1, desc2) \
  38                (((desc1)->a == (desc2)->a) && ((desc1)->b == (desc2)->b))
  39
  40 /*
  41  * Default implementation of macro that returns current
  42  * instruction pointer ("program counter").
  43  */
  44 #define current_text_addr() ({ void *pc; asm volatile("leaq 1f(%%rip),%0\n1:":"=r"(pc)); pc; })
  45
  46 /*
  47  *  CPU type and hardware bug flags. Kept separately for each CPU.
  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         int     cpuid_level;    /* Maximum supported CPUID level, -1=no CPUID */
  56         __u32   x86_capability[NCAPINTS];
  57         char    x86_vendor_id[16];
  58         char    x86_model_id[64];
  59         int     x86_cache_size;  /* in KB */
  60         int     x86_clflush_size;
  61         int     x86_cache_alignment;
  62         int     x86_tlbsize;    /* number of 4K pages in DTLB/ITLB combined(in pages)*/
  63         __u8    x86_virt_bits, x86_phys_bits;
  64         __u8    x86_num_cores;
  65         __u32   x86_power;
  66         __u32   extended_cpuid_level;   /* Max extended CPUID function supported */
  67         unsigned long loops_per_jiffy;
  68 } ____cacheline_aligned;
  69
  70 #define X86_VENDOR_INTEL 0
  71 #define X86_VENDOR_CYRIX 1
  72 #define X86_VENDOR_AMD 2
  73 #define X86_VENDOR_UMC 3
  74 #define X86_VENDOR_NEXGEN 4
  75 #define X86_VENDOR_CENTAUR 5
  76 #define X86_VENDOR_RISE 6
  77 #define X86_VENDOR_TRANSMETA 7
  78 #define X86_VENDOR_NUM 8
  79 #define X86_VENDOR_UNKNOWN 0xff
  80
  81 #ifdef CONFIG_SMP
  82 extern struct cpuinfo_x86 cpu_data[];
  83 #define current_cpu_data cpu_data[smp_processor_id()]
  84 #else
  85 #define cpu_data (&boot_cpu_data)
  86 #define current_cpu_data boot_cpu_data
  87 #endif
  88
  89 extern char ignore_irq13;
  90
  91 extern void identify_cpu(struct cpuinfo_x86 *);
  92 extern void print_cpu_info(struct cpuinfo_x86 *);
  93 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
  94
  95 /*
  96  * EFLAGS bits
  97  */
  98 #define X86_EFLAGS_CF   0x00000001 /* Carry Flag */
  99 #define X86_EFLAGS_PF   0x00000004 /* Parity Flag */
 100 #define X86_EFLAGS_AF   0x00000010 /* Auxillary carry Flag */
 101 #define X86_EFLAGS_ZF   0x00000040 /* Zero Flag */
 102 #define X86_EFLAGS_SF   0x00000080 /* Sign Flag */
 103 #define X86_EFLAGS_TF   0x00000100 /* Trap Flag */
 104 #define X86_EFLAGS_IF   0x00000200 /* Interrupt Flag */
 105 #define X86_EFLAGS_DF   0x00000400 /* Direction Flag */
 106 #define X86_EFLAGS_OF   0x00000800 /* Overflow Flag */
 107 #define X86_EFLAGS_IOPL 0x00003000 /* IOPL mask */
 108 #define X86_EFLAGS_NT   0x00004000 /* Nested Task */
 109 #define X86_EFLAGS_RF   0x00010000 /* Resume Flag */
 110 #define X86_EFLAGS_VM   0x00020000 /* Virtual Mode */
 111 #define X86_EFLAGS_AC   0x00040000 /* Alignment Check */
 112 #define X86_EFLAGS_VIF  0x00080000 /* Virtual Interrupt Flag */
 113 #define X86_EFLAGS_VIP  0x00100000 /* Virtual Interrupt Pending */
 114 #define X86_EFLAGS_ID   0x00200000 /* CPUID detection flag */
 115
 116 /*
 117  * Intel CPU features in CR4
 118  */
 119 #define X86_CR4_VME             0x0001  /* enable vm86 extensions */
 120 #define X86_CR4_PVI             0x0002  /* virtual interrupts flag enable */
 121 #define X86_CR4_TSD             0x0004  /* disable time stamp at ipl 3 */
 122 #define X86_CR4_DE              0x0008  /* enable debugging extensions */
 123 #define X86_CR4_PSE             0x0010  /* enable page size extensions */
 124 #define X86_CR4_PAE             0x0020  /* enable physical address extensions */
 125 #define X86_CR4_MCE             0x0040  /* Machine check enable */
 126 #define X86_CR4_PGE             0x0080  /* enable global pages */
 127 #define X86_CR4_PCE             0x0100  /* enable performance counters at ipl 3 */
 128 #define X86_CR4_OSFXSR          0x0200  /* enable fast FPU save and restore */
 129 #define X86_CR4_OSXMMEXCPT      0x0400  /* enable unmasked SSE exceptions */
 130
 131 /*
 132  * Save the cr4 feature set we're using (ie
 133  * Pentium 4MB enable and PPro Global page
 134  * enable), so that any CPU's that boot up
 135  * after us can get the correct flags.
 136  */
 137 extern unsigned long mmu_cr4_features;
 138
 139 static inline void set_in_cr4 (unsigned long mask)
 140 {
 141         mmu_cr4_features |= mask;
 142         __asm__("movq %%cr4,%%rax\n\t"
 143                 "orq %0,%%rax\n\t"
 144                 "movq %%rax,%%cr4\n"
 145                 : : "irg" (mask)
 146                 :"ax");
 147 }
 148
 149 static inline void clear_in_cr4 (unsigned long mask)
 150 {
 151         mmu_cr4_features &= ~mask;
 152         __asm__("movq %%cr4,%%rax\n\t"
 153                 "andq %0,%%rax\n\t"
 154                 "movq %%rax,%%cr4\n"
 155                 : : "irg" (~mask)
 156                 :"ax");
 157 }
 158
 159
 160 /*
 161  * User space process size. 47bits minus one guard page.
 162  */
 163 #define TASK_SIZE64     (0x800000000000UL - 4096)
 164
 165 /* This decides where the kernel will search for a free chunk of vm
 166  * space during mmap's.
 167  */
 168 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? 0xc0000000 : 0xFFFFe000)
 169
 170 #define TASK_SIZE               (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE64)
 171 #define TASK_SIZE_OF(child)     ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
 172
 173 #define TASK_UNMAPPED_BASE      PAGE_ALIGN(TASK_SIZE/3)
 174
 175 /*
 176  * Size of io_bitmap.
 177  */
 178 #define IO_BITMAP_BITS  65536
 179 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
 180 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
 181 #define IO_BITMAP_OFFSET offsetof(struct tss_struct,io_bitmap)
 182 #define INVALID_IO_BITMAP_OFFSET 0x8000
 183
 184 struct i387_fxsave_struct {
 185         u16     cwd;
 186         u16     swd;
 187         u16     twd;
 188         u16     fop;
 189         u64     rip;
 190         u64     rdp;
 191         u32     mxcsr;
 192         u32     mxcsr_mask;
 193         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
 194         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 128 bytes */
 195         u32     padding[24];
 196 } __attribute__ ((aligned (16)));
 197
 198 union i387_union {
 199         struct i387_fxsave_struct       fxsave;
 200 };
 201
 202 struct tss_struct {
 203         u32 reserved1;
 204         u64 rsp0;
 205         u64 rsp1;
 206         u64 rsp2;
 207         u64 reserved2;
 208         u64 ist[7];
 209         u32 reserved3;
 210         u32 reserved4;
 211         u16 reserved5;
 212         u16 io_bitmap_base;
 213         /*
 214          * The extra 1 is there because the CPU will access an
 215          * additional byte beyond the end of the IO permission
 216          * bitmap. The extra byte must be all 1 bits, and must
 217          * be within the limit. Thus we have:
 218          *
 219          * 128 bytes, the bitmap itself, for ports 0..0x3ff
 220          * 8 bytes, for an extra "long" of ~0UL
 221          */
 222         unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
 223 } __attribute__((packed)) ____cacheline_aligned;
 224
 225 extern struct cpuinfo_x86 boot_cpu_data;
 226 DECLARE_PER_CPU(struct tss_struct,init_tss);
 227
 228 #define ARCH_MIN_TASKALIGN      16
 229
 230 struct thread_struct {
 231         unsigned long   rsp0;
 232         unsigned long   rsp;
 233         unsigned long   userrsp;        /* Copy from PDA */
 234         unsigned long   fs;
 235         unsigned long   gs;
 236         unsigned short  es, ds, fsindex, gsindex;
 237 /* Hardware debugging registers */
 238         unsigned long   debugreg0;
 239         unsigned long   debugreg1;
 240         unsigned long   debugreg2;
 241         unsigned long   debugreg3;
 242         unsigned long   debugreg6;
 243         unsigned long   debugreg7;
 244 /* fault info */
 245         unsigned long   cr2, trap_no, error_code;
 246 /* floating point info */
 247         union i387_union        i387  __attribute__((aligned(16)));
 248 /* IO permissions. the bitmap could be moved into the GDT, that would make
 249    switch faster for a limited number of ioperm using tasks. -AK */
 250         int             ioperm;
 251         unsigned long   *io_bitmap_ptr;
 252         unsigned io_bitmap_max;
 253 /* cached TLS descriptors. */
 254         u64 tls_array[GDT_ENTRY_TLS_ENTRIES];
 255 } __attribute__((aligned(16)));
 256
 257 #define INIT_THREAD  {}
 258
 259 #define INIT_MMAP \
 260 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
 261
 262 #define STACKFAULT_STACK 1
 263 #define DOUBLEFAULT_STACK 2
 264 #define NMI_STACK 3
 265 #define DEBUG_STACK 4
 266 #define MCE_STACK 5
 267 #define N_EXCEPTION_STACKS 5  /* hw limit: 7 */
 268 #define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
 269 #define EXCEPTION_STACK_ORDER 0
 270
 271 #define start_thread(regs,new_rip,new_rsp) do { \
 272         asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0));      \
 273         load_gs_index(0);                                                       \
 274         (regs)->rip = (new_rip);                                                 \
 275         (regs)->rsp = (new_rsp);                                                 \
 276         write_pda(oldrsp, (new_rsp));                                            \
 277         (regs)->cs = __USER_CS;                                                  \
 278         (regs)->ss = __USER_DS;                                                  \
 279         (regs)->eflags = 0x200;                                                  \
 280         set_fs(USER_DS);                                                         \
 281 } while(0)
 282
 283 #define get_debugreg(var, register)                             \
 284                 __asm__("movq %%db" #register ", %0"            \
 285                         :"=r" (var))
 286 #define set_debugreg(value, register)                   \
 287                 __asm__("movq %0,%%db" #register                \
 288                         : /* no output */                       \
 289                         :"r" (value))
 290
 291 struct task_struct;
 292 struct mm_struct;
 293
 294 /* Free all resources held by a thread. */
 295 extern void release_thread(struct task_struct *);
 296
 297 /* Prepare to copy thread state - unlazy all lazy status */
 298 extern void prepare_to_copy(struct task_struct *tsk);
 299
 300 /*
 301  * create a kernel thread without removing it from tasklists
 302  */
 303 extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 304
 305 /*
 306  * Return saved PC of a blocked thread.
 307  * What is this good for? it will be always the scheduler or ret_from_fork.
 308  */
 309 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.rsp - 8))
 310
 311 extern unsigned long get_wchan(struct task_struct *p);
 312 #define KSTK_EIP(tsk) \
 313         (((struct pt_regs *)(tsk->thread.rsp0 - sizeof(struct pt_regs)))->rip)
 314 #define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
 315
 316
 317 struct microcode_header {
 318         unsigned int hdrver;
 319         unsigned int rev;
 320         unsigned int date;
 321         unsigned int sig;
 322         unsigned int cksum;
 323         unsigned int ldrver;
 324         unsigned int pf;
 325         unsigned int datasize;
 326         unsigned int totalsize;
 327         unsigned int reserved[3];
 328 };
 329
 330 struct microcode {
 331         struct microcode_header hdr;
 332         unsigned int bits[0];
 333 };
 334
 335 typedef struct microcode microcode_t;
 336 typedef struct microcode_header microcode_header_t;
 337
 338 /* microcode format is extended from prescott processors */
 339 struct extended_signature {
 340         unsigned int sig;
 341         unsigned int pf;
 342         unsigned int cksum;
 343 };
 344
 345 struct extended_sigtable {
 346         unsigned int count;
 347         unsigned int cksum;
 348         unsigned int reserved[3];
 349         struct extended_signature sigs[0];
 350 };
 351
 352 /* '6' because it used to be for P6 only (but now covers Pentium 4 as well) */
 353 #define MICROCODE_IOCFREE       _IO('6',0)
 354
 355
 356 #define ASM_NOP1 K8_NOP1
 357 #define ASM_NOP2 K8_NOP2
 358 #define ASM_NOP3 K8_NOP3
 359 #define ASM_NOP4 K8_NOP4
 360 #define ASM_NOP5 K8_NOP5
 361 #define ASM_NOP6 K8_NOP6
 362 #define ASM_NOP7 K8_NOP7
 363 #define ASM_NOP8 K8_NOP8
 364
 365 /* Opteron nops */
 366 #define K8_NOP1 ".byte 0x90\n"
 367 #define K8_NOP2 ".byte 0x66,0x90\n"
 368 #define K8_NOP3 ".byte 0x66,0x66,0x90\n"
 369 #define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n"
 370 #define K8_NOP5 K8_NOP3 K8_NOP2
 371 #define K8_NOP6 K8_NOP3 K8_NOP3
 372 #define K8_NOP7 K8_NOP4 K8_NOP3
 373 #define K8_NOP8 K8_NOP4 K8_NOP4
 374
 375 #define ASM_NOP_MAX 8
 376
 377 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
 378 extern inline void rep_nop(void)
 379 {
 380         __asm__ __volatile__("rep;nop": : :"memory");
 381 }
 382
 383 /* Stop speculative execution */
 384 extern inline void sync_core(void)
 385 {
 386         int tmp;
 387         asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx","ecx","edx","memory");
 388 }
 389
 390 #define cpu_has_fpu 1
 391
 392 #define ARCH_HAS_PREFETCH
 393 static inline void prefetch(void *x)
 394 {
 395         asm volatile("prefetcht0 %0" :: "m" (*(unsigned long *)x));
 396 }
 397
 398 #define ARCH_HAS_PREFETCHW 1
 399 static inline void prefetchw(void *x)
 400 {
 401         alternative_input(ASM_NOP5,
 402                           "prefetchw (%1)",
 403                           X86_FEATURE_3DNOW,
 404                           "r" (x));
 405 }
 406
 407 #define ARCH_HAS_SPINLOCK_PREFETCH 1
 408
 409 #define spin_lock_prefetch(x)  prefetchw(x)
 410
 411 #define cpu_relax()   rep_nop()
 412
 413 /*
 414  *      NSC/Cyrix CPU configuration register indexes
 415  */
 416 #define CX86_CCR0 0xc0
 417 #define CX86_CCR1 0xc1
 418 #define CX86_CCR2 0xc2
 419 #define CX86_CCR3 0xc3
 420 #define CX86_CCR4 0xe8
 421 #define CX86_CCR5 0xe9
 422 #define CX86_CCR6 0xea
 423 #define CX86_CCR7 0xeb
 424 #define CX86_DIR0 0xfe
 425 #define CX86_DIR1 0xff
 426 #define CX86_ARR_BASE 0xc4
 427 #define CX86_RCR_BASE 0xdc
 428
 429 /*
 430  *      NSC/Cyrix CPU indexed register access macros
 431  */
 432
 433 #define getCx86(reg) ({ outb((reg), 0x22); inb(0x23); })
 434
 435 #define setCx86(reg, data) do { \
 436         outb((reg), 0x22); \
 437         outb((data), 0x23); \
 438 } while (0)
 439
 440 static inline void __monitor(const void *eax, unsigned long ecx,
 441                 unsigned long edx)
 442 {
 443         /* "monitor %eax,%ecx,%edx;" */
 444         asm volatile(
 445                 ".byte 0x0f,0x01,0xc8;"
 446                 : :"a" (eax), "c" (ecx), "d"(edx));
 447 }
 448
 449 static inline void __mwait(unsigned long eax, unsigned long ecx)
 450 {
 451         /* "mwait %eax,%ecx;" */
 452         asm volatile(
 453                 ".byte 0x0f,0x01,0xc9;"
 454                 : :"a" (eax), "c" (ecx));
 455 }
 456
 457 #define stack_current() \
 458 ({                                                              \
 459         struct thread_info *ti;                                 \
 460         asm("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));  \
 461         ti->task;                                       \
 462 })
 463
 464 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
 465
 466 extern unsigned long boot_option_idle_override;
 467 /* Boot loader type from the setup header */
 468 extern int bootloader_type;
 469
 470 #endif /* __ASM_X86_64_PROCESSOR_H */