aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/processor.h
blob: ae85a8d66a30601a1a22c3b6b84f3df6d3056477 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
#ifndef _ASM_X86_PROCESSOR_H
#define _ASM_X86_PROCESSOR_H

#include <asm/processor-flags.h>

/* Forward declaration, a strange C thing */
struct task_struct;
struct mm_struct;

#include <asm/vm86.h>
#include <asm/math_emu.h>
#include <asm/segment.h>
#include <asm/types.h>
#include <asm/sigcontext.h>
#include <asm/current.h>
#include <asm/cpufeature.h>
#include <asm/system.h>
#include <asm/page.h>
#include <asm/pgtable_types.h>
#include <asm/percpu.h>
#include <asm/msr.h>
#include <asm/desc_defs.h>
#include <asm/nops.h>
#include <asm/ds.h>

#include <linux/personality.h>
#include <linux/cpumask.h>
#include <linux/cache.h>
#include <linux/threads.h>
#include <linux/init.h>

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
static inline void *current_text_addr(void)
{
	void *pc;

	asm volatile("mov $1f, %0; 1:":"=r" (pc));

	return pc;
}

#ifdef CONFIG_X86_VSMP
# define ARCH_MIN_TASKALIGN		(1 << INTERNODE_CACHE_SHIFT)
# define ARCH_MIN_MMSTRUCT_ALIGN	(1 << INTERNODE_CACHE_SHIFT)
#else
# define ARCH_MIN_TASKALIGN		16
# define ARCH_MIN_MMSTRUCT_ALIGN	0
#endif

/*
 *  CPU type and hardware bug flags. Kept separately for each CPU.
 *  Members of this structure are referenced in head.S, so think twice
 *  before touching them. [mj]
 */

struct cpuinfo_x86 {
	__u8			x86;		/* CPU family */
	__u8			x86_vendor;	/* CPU vendor */
	__u8			x86_model;
	__u8			x86_mask;
#ifdef CONFIG_X86_32
	char			wp_works_ok;	/* It doesn't on 386's */

	/* Problems on some 486Dx4's and old 386's: */
	char			hlt_works_ok;
	char			hard_math;
	char			rfu;
	char			fdiv_bug;
	char			f00f_bug;
	char			coma_bug;
	char			pad0;
#else
	/* Number of 4K pages in DTLB/ITLB combined(in pages): */
	int			x86_tlbsize;
#endif
	__u8			x86_virt_bits;
	__u8			x86_phys_bits;
	/* CPUID returned core id bits: */
	__u8			x86_coreid_bits;
	/* Max extended CPUID function supported: */
	__u32			extended_cpuid_level;
	/* Maximum supported CPUID level, -1=no CPUID: */
	int			cpuid_level;
	__u32			x86_capability[NCAPINTS];
	char			x86_vendor_id[16];
	char			x86_model_id[64];
	/* in KB - valid for CPUS which support this call: */
	int			x86_cache_size;
	int			x86_cache_alignment;	/* In bytes */
	int			x86_power;
	unsigned long		loops_per_jiffy;
#ifdef CONFIG_SMP
	/* cpus sharing the last level cache: */
	cpumask_t		llc_shared_map;
#endif
	/* cpuid returned max cores value: */
	u16			 x86_max_cores;
	u16			apicid;
	u16			initial_apicid;
	u16			x86_clflush_size;
#ifdef CONFIG_SMP
	/* number of cores as seen by the OS: */
	u16			booted_cores;
	/* Physical processor id: */
	u16			phys_proc_id;
	/* Core id: */
	u16			cpu_core_id;
	/* Index into per_cpu list: */
	u16			cpu_index;
#endif
	unsigned int		x86_hyper_vendor;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));

#define X86_VENDOR_INTEL	0
#define X86_VENDOR_CYRIX	1
#define X86_VENDOR_AMD		2
#define X86_VENDOR_UMC		3
#define X86_VENDOR_CENTAUR	5
#define X86_VENDOR_TRANSMETA	7
#define X86_VENDOR_NSC		8
#define X86_VENDOR_NUM		9

#define X86_VENDOR_UNKNOWN	0xff

#define X86_HYPER_VENDOR_NONE  0
#define X86_HYPER_VENDOR_VMWARE 1

/*
 * capabilities of CPUs
 */
extern struct cpuinfo_x86	boot_cpu_data;
extern struct cpuinfo_x86	new_cpu_data;

extern struct tss_struct	doublefault_tss;
extern __u32			cleared_cpu_caps[NCAPINTS];

#ifdef CONFIG_SMP
DECLARE_PER_CPU(struct cpuinfo_x86, cpu_info);
#define cpu_data(cpu)		per_cpu(cpu_info, cpu)
#define current_cpu_data	__get_cpu_var(cpu_info)
#else
#define cpu_data(cpu)		boot_cpu_data
#define current_cpu_data	boot_cpu_data
#endif

extern const struct seq_operations cpuinfo_op;

static inline int hlt_works(int cpu)
{
#ifdef CONFIG_X86_32
	return cpu_data(cpu).hlt_works_ok;
#else
	return 1;
#endif
}

#define cache_line_size()	(boot_cpu_data.x86_cache_alignment)

extern void cpu_detect(struct cpuinfo_x86 *c);

extern struct pt_regs *idle_regs(struct pt_regs *);

extern void early_cpu_init(void);
extern void identify_boot_cpu(void);
extern void identify_secondary_cpu(struct cpuinfo_x86 *);
extern void print_cpu_info(struct cpuinfo_x86 *);
extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
extern unsigned short num_cache_leaves;

extern void detect_extended_topology(struct cpuinfo_x86 *c);
extern void detect_ht(struct cpuinfo_x86 *c);

static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
				unsigned int *ecx, unsigned int *edx)
{
	/* ecx is often an input as well as an output. */
	asm("cpuid"
	    : "=a" (*eax),
	      "=b" (*ebx),
	      "=c" (*ecx),
	      "=d" (*edx)
	    : "0" (*eax), "2" (*ecx));
}

static inline void load_cr3(pgd_t *pgdir)
{
	write_cr3(__pa(pgdir));
}

#ifdef CONFIG_X86_32
/* This is the TSS defined by the hardware. */
struct x86_hw_tss {
	unsigned short		back_link, __blh;
	unsigned long		sp0;
	unsigned short		ss0, __ss0h;
	unsigned long		sp1;
	/* ss1 caches MSR_IA32_SYSENTER_CS: */
	unsigned short		ss1, __ss1h;
	unsigned long		sp2;
	unsigned short		ss2, __ss2h;
	unsigned long		__cr3;
	unsigned long		ip;
	unsigned long		flags;
	unsigned long		ax;
	unsigned long		cx;
	unsigned long		dx;
	unsigned long		bx;
	unsigned long		sp;
	unsigned long		bp;
	unsigned long		si;
	unsigned long		di;
	unsigned short		es, __esh;
	unsigned short		cs, __csh;
	unsigned short		ss, __ssh;
	unsigned short		ds, __dsh;
	unsigned short		fs, __fsh;
	unsigned short		gs, __gsh;
	unsigned short		ldt, __ldth;
	unsigned short		trace;
	unsigned short		io_bitmap_base;

} __attribute__((packed));
#else
struct x86_hw_tss {
	u32			reserved1;
	u64			sp0;
	u64			sp1;
	u64			sp2;
	u64			reserved2;
	u64			ist[7];
	u32			reserved3;
	u32			reserved4;
	u16			reserved5;
	u16			io_bitmap_base;

} __attribute__((packed)) ____cacheline_aligned;
#endif

/*
 * IO-bitmap sizes:
 */
#define IO_BITMAP_BITS			65536
#define IO_BITMAP_BYTES			(IO_BITMAP_BITS/8)
#define IO_BITMAP_LONGS			(IO_BITMAP_BYTES/sizeof(long))
#define IO_BITMAP_OFFSET		offsetof(struct tss_struct, io_bitmap)
#define INVALID_IO_BITMAP_OFFSET	0x8000

struct tss_struct {
	/*
	 * The hardware state:
	 */
	struct x86_hw_tss	x86_tss;

	/*
	 * The extra 1 is there because the CPU will access an
	 * additional byte beyond the end of the IO permission
	 * bitmap. The extra byte must be all 1 bits, and must
	 * be within the limit.
	 */
	unsigned long		io_bitmap[IO_BITMAP_LONGS + 1];

	/*
	 * .. and then another 0x100 bytes for the emergency kernel stack:
	 */
	unsigned long		stack[64];

} ____cacheline_aligned;

DECLARE_PER_CPU(struct tss_struct, init_tss);

/*
 * Save the original ist values for checking stack pointers during debugging
 */
struct orig_ist {
	unsigned long		ist[7];
};

#define	MXCSR_DEFAULT		0x1f80

struct i387_fsave_struct {
	u32			cwd;	/* FPU Control Word		*/
	u32			swd;	/* FPU Status Word		*/
	u32			twd;	/* FPU Tag Word			*/
	u32			fip;	/* FPU IP Offset		*/
	u32			fcs;	/* FPU IP Selector		*/
	u32			foo;	/* FPU Operand Pointer Offset	*/
	u32			fos;	/* FPU Operand Pointer Selector	*/

	/* 8*10 bytes for each FP-reg = 80 bytes:			*/
	u32			st_space[20];

	/* Software status information [not touched by FSAVE ]:		*/
	u32			status;
};

struct i387_fxsave_struct {
	u16			cwd; /* Control Word			*/
	u16			swd; /* Status Word			*/
	u16			twd; /* Tag Word			*/
	u16			fop; /* Last Instruction Opcode		*/
	union {
		struct {
			u64	rip; /* Instruction Pointer		*/
			u64	rdp; /* Data Pointer			*/
		};
		struct {
			u32	fip; /* FPU IP Offset			*/
			u32	fcs; /* FPU IP Selector			*/
			u32	foo; /* FPU Operand Offset		*/
			u32	fos; /* FPU Operand Selector		*/
		};
	};
	u32			mxcsr;		/* MXCSR Register State */
	u32			mxcsr_mask;	/* MXCSR Mask		*/

	/* 8*16 bytes for each FP-reg = 128 bytes:			*/
	u32			st_space[32];

	/* 16*16 bytes for each XMM-reg = 256 bytes:			*/
	u32			xmm_space[64];

	u32			padding[12];

	union {
		u32		padding1[12];
		u32		sw_reserved[12];
	};

} __attribute__((aligned(16)));

struct i387_soft_struct {
	u32			cwd;
	u32			swd;
	u32			twd;
	u32			fip;
	u32			fcs;
	u32			foo;
	u32			fos;
	/* 8*10 bytes for each FP-reg = 80 bytes: */
	u32			st_space[20];
	u8			ftop;
	u8			changed;
	u8			lookahead;
	u8			no_update;
	u8			rm;
	u8			alimit;
	struct math_emu_info	*info;
	u32			entry_eip;
};

struct xsave_hdr_struct {
	u64 xstate_bv;
	u64 reserved1[2];
	u64 reserved2[5];
} __attribute__((packed));

struct xsave_struct {
	struct i387_fxsave_struct i387;
	struct xsave_hdr_struct xsave_hdr;
	/* new processor state extensions will go here */
} __attribute__ ((packed, aligned (64)));

union thread_xstate {
	struct i387_fsave_struct	fsave;
	struct i387_fxsave_struct	fxsave;
	struct i387_soft_struct		soft;
	struct xsave_struct		xsave;
};

#ifdef CONFIG_X86_64
DECLARE_PER_CPU(struct orig_ist, orig_ist);

union irq_stack_union {
	char irq_stack[IRQ_STACK_SIZE];
	/*
	 * GCC hardcodes the stack canary as %gs:40.  Since the
	 * irq_stack is the object at %gs:0, we reserve the bottom
	 * 48 bytes of the irq stack for the canary.
	 */
	struct {
		char gs_base[40];
		unsigned long stack_canary;
	};
};

DECLARE_PER_CPU(union irq_stack_union, irq_stack_union);
DECLARE_INIT_PER_CPU(irq_stack_union);

DECLARE_PER_CPU(char *, irq_stack_ptr);
DECLARE_PER_CPU(unsigned int, irq_count);
extern unsigned long kernel_eflags;
extern asmlinkage void ignore_sysret(void);
#else	/* X86_64 */
#ifdef CONFIG_CC_STACKPROTECTOR
DECLARE_PER_CPU(unsigned long, stack_canary);
#endif
#endif	/* X86_64 */

extern unsigned int xstate_size;
extern void free_thread_xstate(struct task_struct *);
extern struct kmem_cache *task_xstate_cachep;
extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
extern unsigned short num_cache_leaves;

struct thread_struct {
	/* Cached TLS descriptors: */
	struct desc_struct	tls_array[GDT_ENTRY_TLS_ENTRIES];
	unsigned long		sp0;
	unsigned long		sp;
#ifdef CONFIG_X86_32
	unsigned long		sysenter_cs;
#else
	unsigned long		usersp;	/* Copy from PDA */
	unsigned short		es;
	unsigned short		ds;
	unsigned short		fsindex;
	unsigned short		gsindex;
#endif
	unsigned long		ip;
	unsigned long		fs;
	unsigned long		gs;
	/* Hardware debugging registers: */
	unsigned long		debugreg0;
	unsigned long		debugreg1;
	unsigned long		debugreg2;
	unsigned long		debugreg3;
	unsigned long		debugreg6;
	unsigned long		debugreg7;
	/* Fault info: */
	unsigned long		cr2;
	unsigned long		trap_no;
	unsigned long		error_code;
	/* floating point and extended processor state */
	union thread_xstate	*xstate;
#ifdef CONFIG_X86_32
	/* Virtual 86 mode info */
	struct vm86_struct __user *vm86_info;
	unsigned long		screen_bitmap;
	unsigned long		v86flags;
	unsigned long		v86mask;
	unsigned long		saved_sp0;
	unsigned int		saved_fs;
	unsigned int		saved_gs;
#endif
	/* IO permissions: */
	unsigned long		*io_bitmap_ptr;
	unsigned long		iopl;
	/* Max allowed port in the bitmap, in bytes: */
	unsigned		io_bitmap_max;
/* MSR_IA32_DEBUGCTLMSR value to switch in if TIF_DEBUGCTLMSR is set.  */
	unsigned long	debugctlmsr;
#ifdef CONFIG_X86_DS
/* Debug Store context; see include/asm-x86/ds.h; goes into MSR_IA32_DS_AREA */
	struct ds_context	*ds_ctx;
#endif /* CONFIG_X86_DS */
#ifdef CONFIG_X86_PTRACE_BTS
/* the signal to send on a bts buffer overflow */
	unsigned int	bts_ovfl_signal;
#endif /* CONFIG_X86_PTRACE_BTS */
};

static inline unsigned long native_get_debugreg(int regno)
{
	unsigned long val = 0;	/* Damn you, gcc! */

	switch (regno) {
	case 0:
		asm("mov %%db0, %0" :"=r" (val));
		break;
	case 1:
		asm("mov %%db1, %0" :"=r" (val));
		break;
	case 2:
		asm("mov %%db2, %0" :"=r" (val));
		break;
	case 3:
		asm("mov %%db3, %0" :"=r" (val));
		break;
	case 6:
		asm("mov %%db6, %0" :"=r" (val));
		break;
	case 7:
		asm("mov %%db7, %0" :"=r" (val));
		break;
	default:
		BUG();
	}
	return val;
}

static inline void native_set_debugreg(int regno, unsigned long value)
{
	switch (regno) {
	case 0:
		asm("mov %0, %%db0"	::"r" (value));
		break;
	case 1:
		asm("mov %0, %%db1"	::"r" (value));
		break;
	case 2:
		asm("mov %0, %%db2"	::"r" (value));
		break;
	case 3:
		asm("mov %0, %%db3"	::"r" (value));
		break;
	case 6:
		asm("mov %0, %%db6"	::"r" (value));
		break;
	case 7:
		asm("mov %0, %%db7"	::"r" (value));
		break;
	default:
		BUG();
	}
}

/*
 * Set IOPL bits in EFLAGS from given mask
 */
static inline void native_set_iopl_mask(unsigned mask)
{
#ifdef CONFIG_X86_32
	unsigned int reg;

	asm volatile ("pushfl;"
		      "popl %0;"
		      "andl %1, %0;"
		      "orl %2, %0;"
		      "pushl %0;"
		      "popfl"
		      : "=&r" (reg)
		      : "i" (~X86_EFLAGS_IOPL), "r" (mask));
#endif
}

static inline void
native_load_sp0(struct tss_struct *tss, struct thread_struct *thread)
{
	tss->x86_tss.sp0 = thread->sp0;
#ifdef CONFIG_X86_32
	/* Only happens when SEP is enabled, no need to test "SEP"arately: */
	if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) {
		tss->x86_tss.ss1 = thread->sysenter_cs;
		wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
	}
#endif
}

static inline void native_swapgs(void)
{
#ifdef CONFIG_X86_64
	asm volatile("swapgs" ::: "memory");
#endif
}

#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
#define __cpuid			native_cpuid
#define paravirt_enabled()	0

/*
 * These special macros can be used to get or set a debugging register
 */
#define get_debugreg(var, register)				\
	(var) = native_get_debugreg(register)
#define set_debugreg(value, register)				\
	native_set_debugreg(register, value)

static inline void load_sp0(struct tss_struct *tss,
			    struct thread_struct *thread)
{
	native_load_sp0(tss, thread);
}

#define set_iopl_mask native_set_iopl_mask
#endif /* CONFIG_PARAVIRT */

/*
 * Save the cr4 feature set we're using (ie
 * Pentium 4MB enable and PPro Global page
 * enable), so that any CPU's that boot up
 * after us can get the correct flags.
 */
extern unsigned long		mmu_cr4_features;

static inline void set_in_cr4(unsigned long mask)
{
	unsigned cr4;

	mmu_cr4_features |= mask;
	cr4 = read_cr4();
	cr4 |= mask;
	write_cr4(cr4);
}

static inline void clear_in_cr4(unsigned long mask)
{
	unsigned cr4;

	mmu_cr4_features &= ~mask;
	cr4 = read_cr4();
	cr4 &= ~mask;
	write_cr4(cr4);
}

typedef struct {
	unsigned long		seg;
} mm_segment_t;


/*
 * create a kernel thread without removing it from tasklists
 */
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);

/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

/* Prepare to copy thread state - unlazy all lazy state */
extern void prepare_to_copy(struct task_struct *tsk);

unsigned long get_wchan(struct task_struct *p);

/*
 * Generic CPUID function
 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
 * resulting in stale register contents being returned.
 */
static inline void cpuid(unsigned int op,
			 unsigned int *eax, unsigned int *ebx,
			 unsigned int *ecx, unsigned int *edx)
{
	*eax = op;
	*ecx = 0;
	__cpuid(eax, ebx, ecx, edx);
}

/* Some CPUID calls want 'count' to be placed in ecx */
static inline void cpuid_count(unsigned int op, int count,
			       unsigned int *eax, unsigned int *ebx,
			       unsigned int *ecx, unsigned int *edx)
{
	*eax = op;
	*ecx = count;
	__cpuid(eax, ebx, ecx, edx);
}

/*
 * CPUID functions returning a single datum
 */
static inline unsigned int cpuid_eax(unsigned int op)
{
	unsigned int eax, ebx, ecx, edx;

	cpuid(op, &eax, &ebx, &ecx, &edx);

	return eax;
}

static inline unsigned int cpuid_ebx(unsigned int op)
{
	unsigned int eax, ebx, ecx, edx;

	cpuid(op, &eax, &ebx, &ecx, &edx);

	return ebx;
}

static inline unsigned int cpuid_ecx(unsigned int op)
{
	unsigned int eax, ebx, ecx, edx;

	cpuid(op, &eax, &ebx, &ecx, &edx);

	return ecx;
}

static inline unsigned int cpuid_edx(unsigned int op)
{
	unsigned int eax, ebx, ecx, edx;

	cpuid(op, &eax, &ebx, &ecx, &edx);

	return edx;
}

/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
static inline void rep_nop(void)
{
	asm volatile("rep; nop" ::: "memory");
}

static inline void cpu_relax(void)
{
	rep_nop();
}

/* Stop speculative execution: */
static inline void sync_core(void)
{
	int tmp;

	asm volatile("cpuid" : "=a" (tmp) : "0" (1)
		     : "ebx", "ecx", "edx", "memory");
}

static inline void __monitor(const void *eax, unsigned long ecx,
			     unsigned long edx)
{
	/* "monitor %eax, %ecx, %edx;" */
	asm volatile(".byte 0x0f, 0x01, 0xc8;"
		     :: "a" (eax), "c" (ecx), "d"(edx));
}

static inline void __mwait(unsigned long eax, unsigned long ecx)
{
	/* "mwait %eax, %ecx;" */
	asm volatile(".byte 0x0f, 0x01, 0xc9;"
		     :: "a" (eax), "c" (ecx));
}

static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
{
	trace_hardirqs_on();
	/* "mwait %eax, %ecx;" */
	asm volatile("sti; .byte 0x0f, 0x01, 0xc9;"
		     :: "a" (eax), "c" (ecx));
}

extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx);

extern void select_idle_routine(const struct cpuinfo_x86 *c);

extern unsigned long		boot_option_idle_override;
extern unsigned long		idle_halt;
extern unsigned long		idle_nomwait;

/*
 * on systems with caches, caches must be flashed as the absolute
 * last instruction before going into a suspended halt.  Otherwise,
 * dirty data can linger in the cache and become stale on resume,
 * leading to strange errors.
 *
 * perform a variety of operations to guarantee that the compiler
 * will not reorder instructions.  wbinvd itself is serializing
 * so the processor will not reorder.
 *
 * Systems without cache can just go into halt.
 */
static inline void wbinvd_halt(void)
{
	mb();
	/* check for clflush to determine if wbinvd is legal */
	if (cpu_has_clflush)
		asm volatile("cli; wbinvd; 1: hlt; jmp 1b" : : : "memory");
	else
		while (1)
			halt();
}

extern void enable_sep_cpu(void);
extern int sysenter_setup(void);

/* Defined in head.S */
extern struct desc_ptr		early_gdt_descr;

extern void cpu_set_gdt(int);
extern void switch_to_new_gdt(int);
extern void load_percpu_segment(int);
extern void cpu_init(void);

static inline unsigned long get_debugctlmsr(void)
{
    unsigned long debugctlmsr = 0;

#ifndef CONFIG_X86_DEBUGCTLMSR
	if (boot_cpu_data.x86 < 6)
		return 0;
#endif
	rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);

    return debugctlmsr;
}

static inline void update_debugctlmsr(unsigned long debugctlmsr)
{
#ifndef CONFIG_X86_DEBUGCTLMSR
	if (boot_cpu_data.x86 < 6)
		return;
#endif
	wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
}

/*
 * from system description table in BIOS. Mostly for MCA use, but
 * others may find it useful:
 */
extern unsigned int		machine_id;
extern unsigned int		machine_submodel_id;
extern unsigned int		BIOS_revision;

/* Boot loader type from the setup header: */
extern int			bootloader_type;

extern char			ignore_fpu_irq;

#define HAVE_ARCH_PICK_MMAP_LAYOUT 1
#define ARCH_HAS_PREFETCHW
#define ARCH_HAS_SPINLOCK_PREFETCH

#ifdef CONFIG_X86_32
# define BASE_PREFETCH		ASM_NOP4
# define ARCH_HAS_PREFETCH
#else
# define BASE_PREFETCH		"prefetcht0 (%1)"
#endif

/*
 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
 *
 * It's not worth to care about 3dnow prefetches for the K6
 * because they are microcoded there and very slow.
 */
static inline void prefetch(const void *x)
{
	alternative_input(BASE_PREFETCH,
			  "prefetchnta (%1)",
			  X86_FEATURE_XMM,
			  "r" (x));
}

/*
 * 3dnow prefetch to get an exclusive cache line.
 * Useful for spinlocks to avoid one state transition in the
 * cache coherency protocol:
 */
static inline void prefetchw(const void *x)
{
	alternative_input(BASE_PREFETCH,
			  "prefetchw (%1)",
			  X86_FEATURE_3DNOW,
			  "r" (x));
}

static inline void spin_lock_prefetch(const void *x)
{
	prefetchw(x);
}

#ifdef CONFIG_X86_32
/*
 * User space process size: 3GB (default).
 */
#define TASK_SIZE		PAGE_OFFSET
#define TASK_SIZE_MAX		TASK_SIZE
#define STACK_TOP		TASK_SIZE
#define STACK_TOP_MAX		STACK_TOP

#define INIT_THREAD  {							  \
	.sp0			= sizeof(init_stack) + (long)&init_stack, \
	.vm86_info		= NULL,					  \
	.sysenter_cs		= __KERNEL_CS,				  \
	.io_bitmap_ptr		= NULL,					  \
	.fs			= __KERNEL_PERCPU,			  \
}

/*
 * Note that the .io_bitmap member must be extra-big. This is because
 * the CPU will access an additional byte beyond the end of the IO
 * permission bitmap. The extra byte must be all 1 bits, and must
 * be within the limit.
 */
#define INIT_TSS  {							  \
	.x86_tss = {							  \
		.sp0		= sizeof(init_stack) + (long)&init_stack, \
		.ss0		= __KERNEL_DS,				  \
		.ss1		= __KERNEL_CS,				  \
		.io_bitmap_base	= INVALID_IO_BITMAP_OFFSET,		  \
	 },								  \
	.io_bitmap		= { [0 ... IO_BITMAP_LONGS] = ~0 },	  \
}

extern unsigned long thread_saved_pc(struct task_struct *tsk);

#define THREAD_SIZE_LONGS      (THREAD_SIZE/sizeof(unsigned long))
#define KSTK_TOP(info)                                                 \
({                                                                     \
       unsigned long *__ptr = (unsigned long *)(info);                 \
       (unsigned long)(&__ptr[THREAD_SIZE_LONGS]);                     \
})

/*
 * The below -8 is to reserve 8 bytes on top of the ring0 stack.
 * This is necessary to guarantee that the entire "struct pt_regs"
 * is accessable even if the CPU haven't stored the SS/ESP registers
 * on the stack (interrupt gate does not save these registers
 * when switching to the same priv ring).
 * Therefore beware: accessing the ss/esp fields of the
 * "struct pt_regs" is possible, but they may contain the
 * completely wrong values.
 */
#define task_pt_regs(task)                                             \
({                                                                     \
       struct pt_regs *__regs__;                                       \
       __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
       __regs__ - 1;                                                   \
})

#define KSTK_ESP(task)		(task_pt_regs(task)->sp)

#else
/*
 * User space process size. 47bits minus one guard page.
 */
#define TASK_SIZE_MAX	((1UL << 47) - PAGE_SIZE)

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define IA32_PAGE_OFFSET	((current->personality & ADDR_LIMIT_3GB) ? \
					0xc0000000 : 0xFFFFe000)

#define TASK_SIZE		(test_thread_flag(TIF_IA32) ? \
					IA32_PAGE_OFFSET : TASK_SIZE_MAX)
#define TASK_SIZE_OF(child)	((test_tsk_thread_flag(child, TIF_IA32)) ? \
					IA32_PAGE_OFFSET : TASK_SIZE_MAX)

#define STACK_TOP		TASK_SIZE
#define STACK_TOP_MAX		TASK_SIZE_MAX

#define INIT_THREAD  { \
	.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
}

#define INIT_TSS  { \
	.x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
}

/*
 * Return saved PC of a blocked thread.
 * What is this good for? it will be always the scheduler or ret_from_fork.
 */
#define thread_saved_pc(t)	(*(unsigned long *)((t)->thread.sp - 8))

#define task_pt_regs(tsk)	((struct pt_regs *)(tsk)->thread.sp0 - 1)
#define KSTK_ESP(tsk)		-1 /* sorry. doesn't work for syscall. */
#endif /* CONFIG_X86_64 */

extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
					       unsigned long new_sp);

/*
 * This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE	(PAGE_ALIGN(TASK_SIZE / 3))

#define KSTK_EIP(task)		(task_pt_regs(task)->ip)

/* Get/set a process' ability to use the timestamp counter instruction */
#define GET_TSC_CTL(adr)	get_tsc_mode((adr))
#define SET_TSC_CTL(val)	set_tsc_mode((val))

extern int get_tsc_mode(unsigned long adr);
extern int set_tsc_mode(unsigned int val);

#endif /* _ASM_X86_PROCESSOR_H */