Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/arch/x86/include/asm/processor.h

  1 #ifndef _ASM_X86_PROCESSOR_H
  2 #define _ASM_X86_PROCESSOR_H
  3 
  4 #include <asm/processor-flags.h>
  5 
  6 /* Forward declaration, a strange C thing */
  7 struct task_struct;
  8 struct mm_struct;
  9 
 10 #include <asm/vm86.h>
 11 #include <asm/math_emu.h>
 12 #include <asm/segment.h>
 13 #include <asm/types.h>
 14 #include <asm/sigcontext.h>
 15 #include <asm/current.h>
 16 #include <asm/cpufeature.h>
 17 #include <asm/page.h>
 18 #include <asm/pgtable_types.h>
 19 #include <asm/percpu.h>
 20 #include <asm/msr.h>
 21 #include <asm/desc_defs.h>
 22 #include <asm/nops.h>
 23 #include <asm/special_insns.h>
 24 
 25 #include <linux/personality.h>
 26 #include <linux/cpumask.h>
 27 #include <linux/cache.h>
 28 #include <linux/threads.h>
 29 #include <linux/math64.h>
 30 #include <linux/err.h>
 31 #include <linux/irqflags.h>
 32 
 33 /*
 34  * We handle most unaligned accesses in hardware.  On the other hand
 35  * unaligned DMA can be quite expensive on some Nehalem processors.
 36  *
 37  * Based on this we disable the IP header alignment in network drivers.
 38  */
 39 #define NET_IP_ALIGN    0
 40 
 41 #define HBP_NUM 4
 42 /*
 43  * Default implementation of macro that returns current
 44  * instruction pointer ("program counter").
 45  */
 46 static inline void *current_text_addr(void)
 47 {
 48         void *pc;
 49 
 50         asm volatile("mov $1f, %0; 1:":"=r" (pc));
 51 
 52         return pc;
 53 }
 54 
 55 #ifdef CONFIG_X86_VSMP
 56 # define ARCH_MIN_TASKALIGN             (1 << INTERNODE_CACHE_SHIFT)
 57 # define ARCH_MIN_MMSTRUCT_ALIGN        (1 << INTERNODE_CACHE_SHIFT)
 58 #else
 59 # define ARCH_MIN_TASKALIGN             16
 60 # define ARCH_MIN_MMSTRUCT_ALIGN        0
 61 #endif
 62 
 63 enum tlb_infos {
 64         ENTRIES,
 65         NR_INFO
 66 };
 67 
 68 extern u16 __read_mostly tlb_lli_4k[NR_INFO];
 69 extern u16 __read_mostly tlb_lli_2m[NR_INFO];
 70 extern u16 __read_mostly tlb_lli_4m[NR_INFO];
 71 extern u16 __read_mostly tlb_lld_4k[NR_INFO];
 72 extern u16 __read_mostly tlb_lld_2m[NR_INFO];
 73 extern u16 __read_mostly tlb_lld_4m[NR_INFO];
 74 extern u16 __read_mostly tlb_lld_1g[NR_INFO];
 75 
 76 /*
 77  *  CPU type and hardware bug flags. Kept separately for each CPU.
 78  *  Members of this structure are referenced in head.S, so think twice
 79  *  before touching them. [mj]
 80  */
 81 
 82 struct cpuinfo_x86 {
 83         __u8                    x86;            /* CPU family */
 84         __u8                    x86_vendor;     /* CPU vendor */
 85         __u8                    x86_model;
 86         __u8                    x86_mask;
 87 #ifdef CONFIG_X86_32
 88         char                    wp_works_ok;    /* It doesn't on 386's */
 89 
 90         /* Problems on some 486Dx4's and old 386's: */
 91         char                    rfu;
 92         char                    pad0;
 93         char                    pad1;
 94 #else
 95         /* Number of 4K pages in DTLB/ITLB combined(in pages): */
 96         int                     x86_tlbsize;
 97 #endif
 98         __u8                    x86_virt_bits;
 99         __u8                    x86_phys_bits;
100         /* CPUID returned core id bits: */
101         __u8                    x86_coreid_bits;
102         /* Max extended CPUID function supported: */
103         __u32                   extended_cpuid_level;
104         /* Maximum supported CPUID level, -1=no CPUID: */
105         int                     cpuid_level;
106         __u32                   x86_capability[NCAPINTS + NBUGINTS];
107         char                    x86_vendor_id[16];
108         char                    x86_model_id[64];
109         /* in KB - valid for CPUS which support this call: */
110         int                     x86_cache_size;
111         int                     x86_cache_alignment;    /* In bytes */
112         int                     x86_power;
113         unsigned long           loops_per_jiffy;
114         /* cpuid returned max cores value: */
115         u16                      x86_max_cores;
116         u16                     apicid;
117         u16                     initial_apicid;
118         u16                     x86_clflush_size;
119         /* number of cores as seen by the OS: */
120         u16                     booted_cores;
121         /* Physical processor id: */
122         u16                     phys_proc_id;
123         /* Core id: */
124         u16                     cpu_core_id;
125         /* Compute unit id */
126         u8                      compute_unit_id;
127         /* Index into per_cpu list: */
128         u16                     cpu_index;
129         u32                     microcode;
130 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
131 
132 #define X86_VENDOR_INTEL        0
133 #define X86_VENDOR_CYRIX        1
134 #define X86_VENDOR_AMD          2
135 #define X86_VENDOR_UMC          3
136 #define X86_VENDOR_CENTAUR      5
137 #define X86_VENDOR_TRANSMETA    7
138 #define X86_VENDOR_NSC          8
139 #define X86_VENDOR_NUM          9
140 
141 #define X86_VENDOR_UNKNOWN      0xff
142 
143 /*
144  * capabilities of CPUs
145  */
146 extern struct cpuinfo_x86       boot_cpu_data;
147 extern struct cpuinfo_x86       new_cpu_data;
148 
149 extern struct tss_struct        doublefault_tss;
150 extern __u32                    cpu_caps_cleared[NCAPINTS];
151 extern __u32                    cpu_caps_set[NCAPINTS];
152 
153 #ifdef CONFIG_SMP
154 DECLARE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
155 #define cpu_data(cpu)           per_cpu(cpu_info, cpu)
156 #else
157 #define cpu_info                boot_cpu_data
158 #define cpu_data(cpu)           boot_cpu_data
159 #endif
160 
161 extern const struct seq_operations cpuinfo_op;
162 
163 #define cache_line_size()       (boot_cpu_data.x86_cache_alignment)
164 
165 extern void cpu_detect(struct cpuinfo_x86 *c);
166 extern void fpu_detect(struct cpuinfo_x86 *c);
167 
168 extern void early_cpu_init(void);
169 extern void identify_boot_cpu(void);
170 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
171 extern void print_cpu_info(struct cpuinfo_x86 *);
172 void print_cpu_msr(struct cpuinfo_x86 *);
173 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
174 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
175 extern void init_amd_cacheinfo(struct cpuinfo_x86 *c);
176 
177 extern void detect_extended_topology(struct cpuinfo_x86 *c);
178 extern void detect_ht(struct cpuinfo_x86 *c);
179 
180 #ifdef CONFIG_X86_32
181 extern int have_cpuid_p(void);
182 #else
183 static inline int have_cpuid_p(void)
184 {
185         return 1;
186 }
187 #endif
188 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
189                                 unsigned int *ecx, unsigned int *edx)
190 {
191         /* ecx is often an input as well as an output. */
192         asm volatile("cpuid"
193             : "=a" (*eax),
194               "=b" (*ebx),
195               "=c" (*ecx),
196               "=d" (*edx)
197             : "" (*eax), "2" (*ecx)
198             : "memory");
199 }
200 
201 static inline void load_cr3(pgd_t *pgdir)
202 {
203         write_cr3(__pa(pgdir));
204 }
205 
206 #ifdef CONFIG_X86_32
207 /* This is the TSS defined by the hardware. */
208 struct x86_hw_tss {
209         unsigned short          back_link, __blh;
210         unsigned long           sp0;
211         unsigned short          ss0, __ss0h;
212         unsigned long           sp1;
213         /* ss1 caches MSR_IA32_SYSENTER_CS: */
214         unsigned short          ss1, __ss1h;
215         unsigned long           sp2;
216         unsigned short          ss2, __ss2h;
217         unsigned long           __cr3;
218         unsigned long           ip;
219         unsigned long           flags;
220         unsigned long           ax;
221         unsigned long           cx;
222         unsigned long           dx;
223         unsigned long           bx;
224         unsigned long           sp;
225         unsigned long           bp;
226         unsigned long           si;
227         unsigned long           di;
228         unsigned short          es, __esh;
229         unsigned short          cs, __csh;
230         unsigned short          ss, __ssh;
231         unsigned short          ds, __dsh;
232         unsigned short          fs, __fsh;
233         unsigned short          gs, __gsh;
234         unsigned short          ldt, __ldth;
235         unsigned short          trace;
236         unsigned short          io_bitmap_base;
237 
238 } __attribute__((packed));
239 #else
240 struct x86_hw_tss {
241         u32                     reserved1;
242         u64                     sp0;
243         u64                     sp1;
244         u64                     sp2;
245         u64                     reserved2;
246         u64                     ist[7];
247         u32                     reserved3;
248         u32                     reserved4;
249         u16                     reserved5;
250         u16                     io_bitmap_base;
251 
252 } __attribute__((packed)) ____cacheline_aligned;
253 #endif
254 
255 /*
256  * IO-bitmap sizes:
257  */
258 #define IO_BITMAP_BITS                  65536
259 #define IO_BITMAP_BYTES                 (IO_BITMAP_BITS/8)
260 #define IO_BITMAP_LONGS                 (IO_BITMAP_BYTES/sizeof(long))
261 #define IO_BITMAP_OFFSET                offsetof(struct tss_struct, io_bitmap)
262 #define INVALID_IO_BITMAP_OFFSET        0x8000
263 
264 struct tss_struct {
265         /*
266          * The hardware state:
267          */
268         struct x86_hw_tss       x86_tss;
269 
270         /*
271          * The extra 1 is there because the CPU will access an
272          * additional byte beyond the end of the IO permission
273          * bitmap. The extra byte must be all 1 bits, and must
274          * be within the limit.
275          */
276         unsigned long           io_bitmap[IO_BITMAP_LONGS + 1];
277 
278         /*
279          * .. and then another 0x100 bytes for the emergency kernel stack:
280          */
281         unsigned long           stack[64];
282 
283 } ____cacheline_aligned;
284 
285 DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss);
286 
287 /*
288  * Save the original ist values for checking stack pointers during debugging
289  */
290 struct orig_ist {
291         unsigned long           ist[7];
292 };
293 
294 #define MXCSR_DEFAULT           0x1f80
295 
296 struct i387_fsave_struct {
297         u32                     cwd;    /* FPU Control Word             */
298         u32                     swd;    /* FPU Status Word              */
299         u32                     twd;    /* FPU Tag Word                 */
300         u32                     fip;    /* FPU IP Offset                */
301         u32                     fcs;    /* FPU IP Selector              */
302         u32                     foo;    /* FPU Operand Pointer Offset   */
303         u32                     fos;    /* FPU Operand Pointer Selector */
304 
305         /* 8*10 bytes for each FP-reg = 80 bytes:                       */
306         u32                     st_space[20];
307 
308         /* Software status information [not touched by FSAVE ]:         */
309         u32                     status;
310 };
311 
312 struct i387_fxsave_struct {
313         u16                     cwd; /* Control Word                    */
314         u16                     swd; /* Status Word                     */
315         u16                     twd; /* Tag Word                        */
316         u16                     fop; /* Last Instruction Opcode         */
317         union {
318                 struct {
319                         u64     rip; /* Instruction Pointer             */
320                         u64     rdp; /* Data Pointer                    */
321                 };
322                 struct {
323                         u32     fip; /* FPU IP Offset                   */
324                         u32     fcs; /* FPU IP Selector                 */
325                         u32     foo; /* FPU Operand Offset              */
326                         u32     fos; /* FPU Operand Selector            */
327                 };
328         };
329         u32                     mxcsr;          /* MXCSR Register State */
330         u32                     mxcsr_mask;     /* MXCSR Mask           */
331 
332         /* 8*16 bytes for each FP-reg = 128 bytes:                      */
333         u32                     st_space[32];
334 
335         /* 16*16 bytes for each XMM-reg = 256 bytes:                    */
336         u32                     xmm_space[64];
337 
338         u32                     padding[12];
339 
340         union {
341                 u32             padding1[12];
342                 u32             sw_reserved[12];
343         };
344 
345 } __attribute__((aligned(16)));
346 
347 struct i387_soft_struct {
348         u32                     cwd;
349         u32                     swd;
350         u32                     twd;
351         u32                     fip;
352         u32                     fcs;
353         u32                     foo;
354         u32                     fos;
355         /* 8*10 bytes for each FP-reg = 80 bytes: */
356         u32                     st_space[20];
357         u8                      ftop;
358         u8                      changed;
359         u8                      lookahead;
360         u8                      no_update;
361         u8                      rm;
362         u8                      alimit;
363         struct math_emu_info    *info;
364         u32                     entry_eip;
365 };
366 
367 struct ymmh_struct {
368         /* 16 * 16 bytes for each YMMH-reg = 256 bytes */
369         u32 ymmh_space[64];
370 };
371 
372 /* We don't support LWP yet: */
373 struct lwp_struct {
374         u8 reserved[128];
375 };
376 
377 struct bndregs_struct {
378         u64 bndregs[8];
379 } __packed;
380 
381 struct bndcsr_struct {
382         u64 cfg_reg_u;
383         u64 status_reg;
384 } __packed;
385 
386 struct xsave_hdr_struct {
387         u64 xstate_bv;
388         u64 xcomp_bv;
389         u64 reserved[6];
390 } __attribute__((packed));
391 
392 struct xsave_struct {
393         struct i387_fxsave_struct i387;
394         struct xsave_hdr_struct xsave_hdr;
395         struct ymmh_struct ymmh;
396         struct lwp_struct lwp;
397         struct bndregs_struct bndregs;
398         struct bndcsr_struct bndcsr;
399         /* new processor state extensions will go here */
400 } __attribute__ ((packed, aligned (64)));
401 
402 union thread_xstate {
403         struct i387_fsave_struct        fsave;
404         struct i387_fxsave_struct       fxsave;
405         struct i387_soft_struct         soft;
406         struct xsave_struct             xsave;
407 };
408 
409 struct fpu {
410         unsigned int last_cpu;
411         unsigned int has_fpu;
412         union thread_xstate *state;
413 };
414 
415 #ifdef CONFIG_X86_64
416 DECLARE_PER_CPU(struct orig_ist, orig_ist);
417 
418 union irq_stack_union {
419         char irq_stack[IRQ_STACK_SIZE];
420         /*
421          * GCC hardcodes the stack canary as %gs:40.  Since the
422          * irq_stack is the object at %gs:0, we reserve the bottom
423          * 48 bytes of the irq stack for the canary.
424          */
425         struct {
426                 char gs_base[40];
427                 unsigned long stack_canary;
428         };
429 };
430 
431 DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union) __visible;
432 DECLARE_INIT_PER_CPU(irq_stack_union);
433 
434 DECLARE_PER_CPU(char *, irq_stack_ptr);
435 DECLARE_PER_CPU(unsigned int, irq_count);
436 extern asmlinkage void ignore_sysret(void);
437 #else   /* X86_64 */
438 #ifdef CONFIG_CC_STACKPROTECTOR
439 /*
440  * Make sure stack canary segment base is cached-aligned:
441  *   "For Intel Atom processors, avoid non zero segment base address
442  *    that is not aligned to cache line boundary at all cost."
443  * (Optim Ref Manual Assembly/Compiler Coding Rule 15.)
444  */
445 struct stack_canary {
446         char __pad[20];         /* canary at %gs:20 */
447         unsigned long canary;
448 };
449 DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
450 #endif
451 /*
452  * per-CPU IRQ handling stacks
453  */
454 struct irq_stack {
455         u32                     stack[THREAD_SIZE/sizeof(u32)];
456 } __aligned(THREAD_SIZE);
457 
458 DECLARE_PER_CPU(struct irq_stack *, hardirq_stack);
459 DECLARE_PER_CPU(struct irq_stack *, softirq_stack);
460 #endif  /* X86_64 */
461 
462 extern unsigned int xstate_size;
463 extern void free_thread_xstate(struct task_struct *);
464 extern struct kmem_cache *task_xstate_cachep;
465 
466 struct perf_event;
467 
468 struct thread_struct {
469         /* Cached TLS descriptors: */
470         struct desc_struct      tls_array[GDT_ENTRY_TLS_ENTRIES];
471         unsigned long           sp0;
472         unsigned long           sp;
473 #ifdef CONFIG_X86_32
474         unsigned long           sysenter_cs;
475 #else
476         unsigned long           usersp; /* Copy from PDA */
477         unsigned short          es;
478         unsigned short          ds;
479         unsigned short          fsindex;
480         unsigned short          gsindex;
481 #endif
482 #ifdef CONFIG_X86_32
483         unsigned long           ip;
484 #endif
485 #ifdef CONFIG_X86_64
486         unsigned long           fs;
487 #endif
488         unsigned long           gs;
489         /* Save middle states of ptrace breakpoints */
490         struct perf_event       *ptrace_bps[HBP_NUM];
491         /* Debug status used for traps, single steps, etc... */
492         unsigned long           debugreg6;
493         /* Keep track of the exact dr7 value set by the user */
494         unsigned long           ptrace_dr7;
495         /* Fault info: */
496         unsigned long           cr2;
497         unsigned long           trap_nr;
498         unsigned long           error_code;
499         /* floating point and extended processor state */
500         struct fpu              fpu;
501 #ifdef CONFIG_X86_32
502         /* Virtual 86 mode info */
503         struct vm86_struct __user *vm86_info;
504         unsigned long           screen_bitmap;
505         unsigned long           v86flags;
506         unsigned long           v86mask;
507         unsigned long           saved_sp0;
508         unsigned int            saved_fs;
509         unsigned int            saved_gs;
510 #endif
511         /* IO permissions: */
512         unsigned long           *io_bitmap_ptr;
513         unsigned long           iopl;
514         /* Max allowed port in the bitmap, in bytes: */
515         unsigned                io_bitmap_max;
516         /*
517          * fpu_counter contains the number of consecutive context switches
518          * that the FPU is used. If this is over a threshold, the lazy fpu
519          * saving becomes unlazy to save the trap. This is an unsigned char
520          * so that after 256 times the counter wraps and the behavior turns
521          * lazy again; this to deal with bursty apps that only use FPU for
522          * a short time
523          */
524         unsigned char fpu_counter;
525 };
526 
527 /*
528  * Set IOPL bits in EFLAGS from given mask
529  */
530 static inline void native_set_iopl_mask(unsigned mask)
531 {
532 #ifdef CONFIG_X86_32
533         unsigned int reg;
534 
535         asm volatile ("pushfl;"
536                       "popl %0;"
537                       "andl %1, %0;"
538                       "orl %2, %0;"
539                       "pushl %0;"
540                       "popfl"
541                       : "=&r" (reg)
542                       : "i" (~X86_EFLAGS_IOPL), "r" (mask));
543 #endif
544 }
545 
546 static inline void
547 native_load_sp0(struct tss_struct *tss, struct thread_struct *thread)
548 {
549         tss->x86_tss.sp0 = thread->sp0;
550 #ifdef CONFIG_X86_32
551         /* Only happens when SEP is enabled, no need to test "SEP"arately: */
552         if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) {
553                 tss->x86_tss.ss1 = thread->sysenter_cs;
554                 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
555         }
556 #endif
557 }
558 
559 static inline void native_swapgs(void)
560 {
561 #ifdef CONFIG_X86_64
562         asm volatile("swapgs" ::: "memory");
563 #endif
564 }
565 
566 #ifdef CONFIG_PARAVIRT
567 #include <asm/paravirt.h>
568 #else
569 #define __cpuid                 native_cpuid
570 #define paravirt_enabled()      0
571 
572 static inline void load_sp0(struct tss_struct *tss,
573                             struct thread_struct *thread)
574 {
575         native_load_sp0(tss, thread);
576 }
577 
578 #define set_iopl_mask native_set_iopl_mask
579 #endif /* CONFIG_PARAVIRT */
580 
581 /*
582  * Save the cr4 feature set we're using (ie
583  * Pentium 4MB enable and PPro Global page
584  * enable), so that any CPU's that boot up
585  * after us can get the correct flags.
586  */
587 extern unsigned long mmu_cr4_features;
588 extern u32 *trampoline_cr4_features;
589 
590 static inline void set_in_cr4(unsigned long mask)
591 {
592         unsigned long cr4;
593 
594         mmu_cr4_features |= mask;
595         if (trampoline_cr4_features)
596                 *trampoline_cr4_features = mmu_cr4_features;
597         cr4 = read_cr4();
598         cr4 |= mask;
599         write_cr4(cr4);
600 }
601 
602 static inline void clear_in_cr4(unsigned long mask)
603 {
604         unsigned long cr4;
605 
606         mmu_cr4_features &= ~mask;
607         if (trampoline_cr4_features)
608                 *trampoline_cr4_features = mmu_cr4_features;
609         cr4 = read_cr4();
610         cr4 &= ~mask;
611         write_cr4(cr4);
612 }
613 
614 typedef struct {
615         unsigned long           seg;
616 } mm_segment_t;
617 
618 
619 /* Free all resources held by a thread. */
620 extern void release_thread(struct task_struct *);
621 
622 unsigned long get_wchan(struct task_struct *p);
623 
624 /*
625  * Generic CPUID function
626  * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
627  * resulting in stale register contents being returned.
628  */
629 static inline void cpuid(unsigned int op,
630                          unsigned int *eax, unsigned int *ebx,
631                          unsigned int *ecx, unsigned int *edx)
632 {
633         *eax = op;
634         *ecx = 0;
635         __cpuid(eax, ebx, ecx, edx);
636 }
637 
638 /* Some CPUID calls want 'count' to be placed in ecx */
639 static inline void cpuid_count(unsigned int op, int count,
640                                unsigned int *eax, unsigned int *ebx,
641                                unsigned int *ecx, unsigned int *edx)
642 {
643         *eax = op;
644         *ecx = count;
645         __cpuid(eax, ebx, ecx, edx);
646 }
647 
648 /*
649  * CPUID functions returning a single datum
650  */
651 static inline unsigned int cpuid_eax(unsigned int op)
652 {
653         unsigned int eax, ebx, ecx, edx;
654 
655         cpuid(op, &eax, &ebx, &ecx, &edx);
656 
657         return eax;
658 }
659 
660 static inline unsigned int cpuid_ebx(unsigned int op)
661 {
662         unsigned int eax, ebx, ecx, edx;
663 
664         cpuid(op, &eax, &ebx, &ecx, &edx);
665 
666         return ebx;
667 }
668 
669 static inline unsigned int cpuid_ecx(unsigned int op)
670 {
671         unsigned int eax, ebx, ecx, edx;
672 
673         cpuid(op, &eax, &ebx, &ecx, &edx);
674 
675         return ecx;
676 }
677 
678 static inline unsigned int cpuid_edx(unsigned int op)
679 {
680         unsigned int eax, ebx, ecx, edx;
681 
682         cpuid(op, &eax, &ebx, &ecx, &edx);
683 
684         return edx;
685 }
686 
687 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
688 static inline void rep_nop(void)
689 {
690         asm volatile("rep; nop" ::: "memory");
691 }
692 
693 static inline void cpu_relax(void)
694 {
695         rep_nop();
696 }
697 
698 #define cpu_relax_lowlatency() cpu_relax()
699 
700 /* Stop speculative execution and prefetching of modified code. */
701 static inline void sync_core(void)
702 {
703         int tmp;
704 
705 #ifdef CONFIG_M486
706         /*
707          * Do a CPUID if available, otherwise do a jump.  The jump
708          * can conveniently enough be the jump around CPUID.
709          */
710         asm volatile("cmpl %2,%1\n\t"
711                      "jl 1f\n\t"
712                      "cpuid\n"
713                      "1:"
714                      : "=a" (tmp)
715                      : "rm" (boot_cpu_data.cpuid_level), "ri" (0), "" (1)
716                      : "ebx", "ecx", "edx", "memory");
717 #else
718         /*
719          * CPUID is a barrier to speculative execution.
720          * Prefetched instructions are automatically
721          * invalidated when modified.
722          */
723         asm volatile("cpuid"
724                      : "=a" (tmp)
725                      : "" (1)
726                      : "ebx", "ecx", "edx", "memory");
727 #endif
728 }
729 
730 extern void select_idle_routine(const struct cpuinfo_x86 *c);
731 extern void init_amd_e400_c1e_mask(void);
732 
733 extern unsigned long            boot_option_idle_override;
734 extern bool                     amd_e400_c1e_detected;
735 
736 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
737                          IDLE_POLL};
738 
739 extern void enable_sep_cpu(void);
740 extern int sysenter_setup(void);
741 
742 extern void early_trap_init(void);
743 void early_trap_pf_init(void);
744 
745 /* Defined in head.S */
746 extern struct desc_ptr          early_gdt_descr;
747 
748 extern void cpu_set_gdt(int);
749 extern void switch_to_new_gdt(int);
750 extern void load_percpu_segment(int);
751 extern void cpu_init(void);
752 
753 static inline unsigned long get_debugctlmsr(void)
754 {
755         unsigned long debugctlmsr = 0;
756 
757 #ifndef CONFIG_X86_DEBUGCTLMSR
758         if (boot_cpu_data.x86 < 6)
759                 return 0;
760 #endif
761         rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
762 
763         return debugctlmsr;
764 }
765 
766 static inline void update_debugctlmsr(unsigned long debugctlmsr)
767 {
768 #ifndef CONFIG_X86_DEBUGCTLMSR
769         if (boot_cpu_data.x86 < 6)
770                 return;
771 #endif
772         wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
773 }
774 
775 extern void set_task_blockstep(struct task_struct *task, bool on);
776 
777 /*
778  * from system description table in BIOS. Mostly for MCA use, but
779  * others may find it useful:
780  */
781 extern unsigned int             machine_id;
782 extern unsigned int             machine_submodel_id;
783 extern unsigned int             BIOS_revision;
784 
785 /* Boot loader type from the setup header: */
786 extern int                      bootloader_type;
787 extern int                      bootloader_version;
788 
789 extern char                     ignore_fpu_irq;
790 
791 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
792 #define ARCH_HAS_PREFETCHW
793 #define ARCH_HAS_SPINLOCK_PREFETCH
794 
795 #ifdef CONFIG_X86_32
796 # define BASE_PREFETCH          ASM_NOP4
797 # define ARCH_HAS_PREFETCH
798 #else
799 # define BASE_PREFETCH          "prefetcht0 (%1)"
800 #endif
801 
802 /*
803  * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
804  *
805  * It's not worth to care about 3dnow prefetches for the K6
806  * because they are microcoded there and very slow.
807  */
808 static inline void prefetch(const void *x)
809 {
810         alternative_input(BASE_PREFETCH,
811                           "prefetchnta (%1)",
812                           X86_FEATURE_XMM,
813                           "r" (x));
814 }
815 
816 /*
817  * 3dnow prefetch to get an exclusive cache line.
818  * Useful for spinlocks to avoid one state transition in the
819  * cache coherency protocol:
820  */
821 static inline void prefetchw(const void *x)
822 {
823         alternative_input(BASE_PREFETCH,
824                           "prefetchw (%1)",
825                           X86_FEATURE_3DNOW,
826                           "r" (x));
827 }
828 
829 static inline void spin_lock_prefetch(const void *x)
830 {
831         prefetchw(x);
832 }
833 
834 #ifdef CONFIG_X86_32
835 /*
836  * User space process size: 3GB (default).
837  */
838 #define TASK_SIZE               PAGE_OFFSET
839 #define TASK_SIZE_MAX           TASK_SIZE
840 #define STACK_TOP               TASK_SIZE
841 #define STACK_TOP_MAX           STACK_TOP
842 
843 #define INIT_THREAD  {                                                    \
844         .sp0                    = sizeof(init_stack) + (long)&init_stack, \
845         .vm86_info              = NULL,                                   \
846         .sysenter_cs            = __KERNEL_CS,                            \
847         .io_bitmap_ptr          = NULL,                                   \
848 }
849 
850 /*
851  * Note that the .io_bitmap member must be extra-big. This is because
852  * the CPU will access an additional byte beyond the end of the IO
853  * permission bitmap. The extra byte must be all 1 bits, and must
854  * be within the limit.
855  */
856 #define INIT_TSS  {                                                       \
857         .x86_tss = {                                                      \
858                 .sp0            = sizeof(init_stack) + (long)&init_stack, \
859                 .ss0            = __KERNEL_DS,                            \
860                 .ss1            = __KERNEL_CS,                            \
861                 .io_bitmap_base = INVALID_IO_BITMAP_OFFSET,               \
862          },                                                               \
863         .io_bitmap              = { [0 ... IO_BITMAP_LONGS] = ~0 },       \
864 }
865 
866 extern unsigned long thread_saved_pc(struct task_struct *tsk);
867 
868 #define THREAD_SIZE_LONGS      (THREAD_SIZE/sizeof(unsigned long))
869 #define KSTK_TOP(info)                                                 \
870 ({                                                                     \
871        unsigned long *__ptr = (unsigned long *)(info);                 \
872        (unsigned long)(&__ptr[THREAD_SIZE_LONGS]);                     \
873 })
874 
875 /*
876  * The below -8 is to reserve 8 bytes on top of the ring0 stack.
877  * This is necessary to guarantee that the entire "struct pt_regs"
878  * is accessible even if the CPU haven't stored the SS/ESP registers
879  * on the stack (interrupt gate does not save these registers
880  * when switching to the same priv ring).
881  * Therefore beware: accessing the ss/esp fields of the
882  * "struct pt_regs" is possible, but they may contain the
883  * completely wrong values.
884  */
885 #define task_pt_regs(task)                                             \
886 ({                                                                     \
887        struct pt_regs *__regs__;                                       \
888        __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
889        __regs__ - 1;                                                   \
890 })
891 
892 #define KSTK_ESP(task)          (task_pt_regs(task)->sp)
893 
894 #else
895 /*
896  * User space process size. 47bits minus one guard page.
897  */
898 #define TASK_SIZE_MAX   ((1UL << 47) - PAGE_SIZE)
899 
900 /* This decides where the kernel will search for a free chunk of vm
901  * space during mmap's.
902  */
903 #define IA32_PAGE_OFFSET        ((current->personality & ADDR_LIMIT_3GB) ? \
904                                         0xc0000000 : 0xFFFFe000)
905 
906 #define TASK_SIZE               (test_thread_flag(TIF_ADDR32) ? \
907                                         IA32_PAGE_OFFSET : TASK_SIZE_MAX)
908 #define TASK_SIZE_OF(child)     ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \
909                                         IA32_PAGE_OFFSET : TASK_SIZE_MAX)
910 
911 #define STACK_TOP               TASK_SIZE
912 #define STACK_TOP_MAX           TASK_SIZE_MAX
913 
914 #define INIT_THREAD  { \
915         .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
916 }
917 
918 #define INIT_TSS  { \
919         .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
920 }
921 
922 /*
923  * Return saved PC of a blocked thread.
924  * What is this good for? it will be always the scheduler or ret_from_fork.
925  */
926 #define thread_saved_pc(t)      (*(unsigned long *)((t)->thread.sp - 8))
927 
928 #define task_pt_regs(tsk)       ((struct pt_regs *)(tsk)->thread.sp0 - 1)
929 extern unsigned long KSTK_ESP(struct task_struct *task);
930 
931 /*
932  * User space RSP while inside the SYSCALL fast path
933  */
934 DECLARE_PER_CPU(unsigned long, old_rsp);
935 
936 #endif /* CONFIG_X86_64 */
937 
938 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
939                                                unsigned long new_sp);
940 
941 /*
942  * This decides where the kernel will search for a free chunk of vm
943  * space during mmap's.
944  */
945 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 3))
946 
947 #define KSTK_EIP(task)          (task_pt_regs(task)->ip)
948 
949 /* Get/set a process' ability to use the timestamp counter instruction */
950 #define GET_TSC_CTL(adr)        get_tsc_mode((adr))
951 #define SET_TSC_CTL(val)        set_tsc_mode((val))
952 
953 extern int get_tsc_mode(unsigned long adr);
954 extern int set_tsc_mode(unsigned int val);
955 
956 extern u16 amd_get_nb_id(int cpu);
957 
958 static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
959 {
960         uint32_t base, eax, signature[3];
961 
962         for (base = 0x40000000; base < 0x40010000; base += 0x100) {
963                 cpuid(base, &eax, &signature[0], &signature[1], &signature[2]);
964 
965                 if (!memcmp(sig, signature, 12) &&
966                     (leaves == 0 || ((eax - base) >= leaves)))
967                         return base;
968         }
969 
970         return 0;
971 }
972 
973 extern unsigned long arch_align_stack(unsigned long sp);
974 extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
975 
976 void default_idle(void);
977 #ifdef  CONFIG_XEN
978 bool xen_set_default_idle(void);
979 #else
980 #define xen_set_default_idle 0
981 #endif
982 
983 void stop_this_cpu(void *dummy);
984 void df_debug(struct pt_regs *regs, long error_code);
985 #endif /* _ASM_X86_PROCESSOR_H */
986 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us