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uwb: Use kcalloc instead of kzalloc to allocate array
[zen-stable.git] / arch / x86 / include / asm / processor.h
blobb650435ffb538d97df113a7b662975e88a60c375
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/system.h>
18 #include <asm/page.h>
19 #include <asm/pgtable_types.h>
20 #include <asm/percpu.h>
21 #include <asm/msr.h>
22 #include <asm/desc_defs.h>
23 #include <asm/nops.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/init.h>
31 #include <linux/err.h>
32
33 #define HBP_NUM 4
34 /*
35 * Default implementation of macro that returns current
36 * instruction pointer ("program counter").
37 */
38 static inline void *current_text_addr(void)
39 {
40 void *pc;
41
42 asm volatile("mov $1f, %0; 1:":"=r" (pc));
43
44 return pc;
45 }
46
47 #ifdef CONFIG_X86_VSMP
48 # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
49 # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
50 #else
51 # define ARCH_MIN_TASKALIGN 16
52 # define ARCH_MIN_MMSTRUCT_ALIGN 0
53 #endif
54
55 /*
56 * CPU type and hardware bug flags. Kept separately for each CPU.
57 * Members of this structure are referenced in head.S, so think twice
58 * before touching them. [mj]
59 */
60
61 struct cpuinfo_x86 {
62 __u8 x86; /* CPU family */
63 __u8 x86_vendor; /* CPU vendor */
64 __u8 x86_model;
65 __u8 x86_mask;
66 #ifdef CONFIG_X86_32
67 char wp_works_ok; /* It doesn't on 386's */
68
69 /* Problems on some 486Dx4's and old 386's: */
70 char hlt_works_ok;
71 char hard_math;
72 char rfu;
73 char fdiv_bug;
74 char f00f_bug;
75 char coma_bug;
76 char pad0;
77 #else
78 /* Number of 4K pages in DTLB/ITLB combined(in pages): */
79 int x86_tlbsize;
80 #endif
81 __u8 x86_virt_bits;
82 __u8 x86_phys_bits;
83 /* CPUID returned core id bits: */
84 __u8 x86_coreid_bits;
85 /* Max extended CPUID function supported: */
86 __u32 extended_cpuid_level;
87 /* Maximum supported CPUID level, -1=no CPUID: */
88 int cpuid_level;
89 __u32 x86_capability[NCAPINTS];
90 char x86_vendor_id[16];
91 char x86_model_id[64];
92 /* in KB - valid for CPUS which support this call: */
93 int x86_cache_size;
94 int x86_cache_alignment; /* In bytes */
95 int x86_power;
96 unsigned long loops_per_jiffy;
97 /* cpuid returned max cores value: */
98 u16 x86_max_cores;
99 u16 apicid;
100 u16 initial_apicid;
101 u16 x86_clflush_size;
102 #ifdef CONFIG_SMP
103 /* number of cores as seen by the OS: */
104 u16 booted_cores;
105 /* Physical processor id: */
106 u16 phys_proc_id;
107 /* Core id: */
108 u16 cpu_core_id;
109 /* Compute unit id */
110 u8 compute_unit_id;
111 /* Index into per_cpu list: */
112 u16 cpu_index;
113 #endif
114 u32 microcode;
115 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
116
117 #define X86_VENDOR_INTEL 0
118 #define X86_VENDOR_CYRIX 1
119 #define X86_VENDOR_AMD 2
120 #define X86_VENDOR_UMC 3
121 #define X86_VENDOR_CENTAUR 5
122 #define X86_VENDOR_TRANSMETA 7
123 #define X86_VENDOR_NSC 8
124 #define X86_VENDOR_NUM 9
125
126 #define X86_VENDOR_UNKNOWN 0xff
127
128 /*
129 * capabilities of CPUs
130 */
131 extern struct cpuinfo_x86 boot_cpu_data;
132 extern struct cpuinfo_x86 new_cpu_data;
133
134 extern struct tss_struct doublefault_tss;
135 extern __u32 cpu_caps_cleared[NCAPINTS];
136 extern __u32 cpu_caps_set[NCAPINTS];
137
138 #ifdef CONFIG_SMP
139 DECLARE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
140 #define cpu_data(cpu) per_cpu(cpu_info, cpu)
141 #else
142 #define cpu_info boot_cpu_data
143 #define cpu_data(cpu) boot_cpu_data
144 #endif
145
146 extern const struct seq_operations cpuinfo_op;
147
148 static inline int hlt_works(int cpu)
149 {
150 #ifdef CONFIG_X86_32
151 return cpu_data(cpu).hlt_works_ok;
152 #else
153 return 1;
154 #endif
155 }
156
157 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
158
159 extern void cpu_detect(struct cpuinfo_x86 *c);
160
161 extern struct pt_regs *idle_regs(struct pt_regs *);
162
163 extern void early_cpu_init(void);
164 extern void identify_boot_cpu(void);
165 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
166 extern void print_cpu_info(struct cpuinfo_x86 *);
167 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
168 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
169 extern unsigned short num_cache_leaves;
170
171 extern void detect_extended_topology(struct cpuinfo_x86 *c);
172 extern void detect_ht(struct cpuinfo_x86 *c);
173
174 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
175 unsigned int *ecx, unsigned int *edx)
176 {
177 /* ecx is often an input as well as an output. */
178 asm volatile("cpuid"
179 : "=a" (*eax),
180 "=b" (*ebx),
181 "=c" (*ecx),
182 "=d" (*edx)
183 : "0" (*eax), "2" (*ecx)
184 : "memory");
185 }
186
187 static inline void load_cr3(pgd_t *pgdir)
188 {
189 write_cr3(__pa(pgdir));
190 }
191
192 #ifdef CONFIG_X86_32
193 /* This is the TSS defined by the hardware. */
194 struct x86_hw_tss {
195 unsigned short back_link, __blh;
196 unsigned long sp0;
197 unsigned short ss0, __ss0h;
198 unsigned long sp1;
199 /* ss1 caches MSR_IA32_SYSENTER_CS: */
200 unsigned short ss1, __ss1h;
201 unsigned long sp2;
202 unsigned short ss2, __ss2h;
203 unsigned long __cr3;
204 unsigned long ip;
205 unsigned long flags;
206 unsigned long ax;
207 unsigned long cx;
208 unsigned long dx;
209 unsigned long bx;
210 unsigned long sp;
211 unsigned long bp;
212 unsigned long si;
213 unsigned long di;
214 unsigned short es, __esh;
215 unsigned short cs, __csh;
216 unsigned short ss, __ssh;
217 unsigned short ds, __dsh;
218 unsigned short fs, __fsh;
219 unsigned short gs, __gsh;
220 unsigned short ldt, __ldth;
221 unsigned short trace;
222 unsigned short io_bitmap_base;
223
224 } __attribute__((packed));
225 #else
226 struct x86_hw_tss {
227 u32 reserved1;
228 u64 sp0;
229 u64 sp1;
230 u64 sp2;
231 u64 reserved2;
232 u64 ist[7];
233 u32 reserved3;
234 u32 reserved4;
235 u16 reserved5;
236 u16 io_bitmap_base;
237
238 } __attribute__((packed)) ____cacheline_aligned;
239 #endif
240
241 /*
242 * IO-bitmap sizes:
243 */
244 #define IO_BITMAP_BITS 65536
245 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
246 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
247 #define IO_BITMAP_OFFSET offsetof(struct tss_struct, io_bitmap)
248 #define INVALID_IO_BITMAP_OFFSET 0x8000
249
250 struct tss_struct {
251 /*
252 * The hardware state:
253 */
254 struct x86_hw_tss x86_tss;
255
256 /*
257 * The extra 1 is there because the CPU will access an
258 * additional byte beyond the end of the IO permission
259 * bitmap. The extra byte must be all 1 bits, and must
260 * be within the limit.
261 */
262 unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
263
264 /*
265 * .. and then another 0x100 bytes for the emergency kernel stack:
266 */
267 unsigned long stack[64];
268
269 } ____cacheline_aligned;
270
271 DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss);
272
273 /*
274 * Save the original ist values for checking stack pointers during debugging
275 */
276 struct orig_ist {
277 unsigned long ist[7];
278 };
279
280 #define MXCSR_DEFAULT 0x1f80
281
282 struct i387_fsave_struct {
283 u32 cwd; /* FPU Control Word */
284 u32 swd; /* FPU Status Word */
285 u32 twd; /* FPU Tag Word */
286 u32 fip; /* FPU IP Offset */
287 u32 fcs; /* FPU IP Selector */
288 u32 foo; /* FPU Operand Pointer Offset */
289 u32 fos; /* FPU Operand Pointer Selector */
290
291 /* 8*10 bytes for each FP-reg = 80 bytes: */
292 u32 st_space[20];
293
294 /* Software status information [not touched by FSAVE ]: */
295 u32 status;
296 };
297
298 struct i387_fxsave_struct {
299 u16 cwd; /* Control Word */
300 u16 swd; /* Status Word */
301 u16 twd; /* Tag Word */
302 u16 fop; /* Last Instruction Opcode */
303 union {
304 struct {
305 u64 rip; /* Instruction Pointer */
306 u64 rdp; /* Data Pointer */
307 };
308 struct {
309 u32 fip; /* FPU IP Offset */
310 u32 fcs; /* FPU IP Selector */
311 u32 foo; /* FPU Operand Offset */
312 u32 fos; /* FPU Operand Selector */
313 };
314 };
315 u32 mxcsr; /* MXCSR Register State */
316 u32 mxcsr_mask; /* MXCSR Mask */
317
318 /* 8*16 bytes for each FP-reg = 128 bytes: */
319 u32 st_space[32];
320
321 /* 16*16 bytes for each XMM-reg = 256 bytes: */
322 u32 xmm_space[64];
323
324 u32 padding[12];
325
326 union {
327 u32 padding1[12];
328 u32 sw_reserved[12];
329 };
330
331 } __attribute__((aligned(16)));
332
333 struct i387_soft_struct {
334 u32 cwd;
335 u32 swd;
336 u32 twd;
337 u32 fip;
338 u32 fcs;
339 u32 foo;
340 u32 fos;
341 /* 8*10 bytes for each FP-reg = 80 bytes: */
342 u32 st_space[20];
343 u8 ftop;
344 u8 changed;
345 u8 lookahead;
346 u8 no_update;
347 u8 rm;
348 u8 alimit;
349 struct math_emu_info *info;
350 u32 entry_eip;
351 };
352
353 struct ymmh_struct {
354 /* 16 * 16 bytes for each YMMH-reg = 256 bytes */
355 u32 ymmh_space[64];
356 };
357
358 struct xsave_hdr_struct {
359 u64 xstate_bv;
360 u64 reserved1[2];
361 u64 reserved2[5];
362 } __attribute__((packed));
363
364 struct xsave_struct {
365 struct i387_fxsave_struct i387;
366 struct xsave_hdr_struct xsave_hdr;
367 struct ymmh_struct ymmh;
368 /* new processor state extensions will go here */
369 } __attribute__ ((packed, aligned (64)));
370
371 union thread_xstate {
372 struct i387_fsave_struct fsave;
373 struct i387_fxsave_struct fxsave;
374 struct i387_soft_struct soft;
375 struct xsave_struct xsave;
376 };
377
378 struct fpu {
379 union thread_xstate *state;
380 };
381
382 #ifdef CONFIG_X86_64
383 DECLARE_PER_CPU(struct orig_ist, orig_ist);
384
385 union irq_stack_union {
386 char irq_stack[IRQ_STACK_SIZE];
387 /*
388 * GCC hardcodes the stack canary as %gs:40. Since the
389 * irq_stack is the object at %gs:0, we reserve the bottom
390 * 48 bytes of the irq stack for the canary.
391 */
392 struct {
393 char gs_base[40];
394 unsigned long stack_canary;
395 };
396 };
397
398 DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union);
399 DECLARE_INIT_PER_CPU(irq_stack_union);
400
401 DECLARE_PER_CPU(char *, irq_stack_ptr);
402 DECLARE_PER_CPU(unsigned int, irq_count);
403 extern unsigned long kernel_eflags;
404 extern asmlinkage void ignore_sysret(void);
405 #else /* X86_64 */
406 #ifdef CONFIG_CC_STACKPROTECTOR
407 /*
408 * Make sure stack canary segment base is cached-aligned:
409 * "For Intel Atom processors, avoid non zero segment base address
410 * that is not aligned to cache line boundary at all cost."
411 * (Optim Ref Manual Assembly/Compiler Coding Rule 15.)
412 */
413 struct stack_canary {
414 char __pad[20]; /* canary at %gs:20 */
415 unsigned long canary;
416 };
417 DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
418 #endif
419 #endif /* X86_64 */
420
421 extern unsigned int xstate_size;
422 extern void free_thread_xstate(struct task_struct *);
423 extern struct kmem_cache *task_xstate_cachep;
424
425 struct perf_event;
426
427 struct thread_struct {
428 /* Cached TLS descriptors: */
429 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
430 unsigned long sp0;
431 unsigned long sp;
432 #ifdef CONFIG_X86_32
433 unsigned long sysenter_cs;
434 #else
435 unsigned long usersp; /* Copy from PDA */
436 unsigned short es;
437 unsigned short ds;
438 unsigned short fsindex;
439 unsigned short gsindex;
440 #endif
441 #ifdef CONFIG_X86_32
442 unsigned long ip;
443 #endif
444 #ifdef CONFIG_X86_64
445 unsigned long fs;
446 #endif
447 unsigned long gs;
448 /* Save middle states of ptrace breakpoints */
449 struct perf_event *ptrace_bps[HBP_NUM];
450 /* Debug status used for traps, single steps, etc... */
451 unsigned long debugreg6;
452 /* Keep track of the exact dr7 value set by the user */
453 unsigned long ptrace_dr7;
454 /* Fault info: */
455 unsigned long cr2;
456 unsigned long trap_no;
457 unsigned long error_code;
458 /* floating point and extended processor state */
459 struct fpu fpu;
460 #ifdef CONFIG_X86_32
461 /* Virtual 86 mode info */
462 struct vm86_struct __user *vm86_info;
463 unsigned long screen_bitmap;
464 unsigned long v86flags;
465 unsigned long v86mask;
466 unsigned long saved_sp0;
467 unsigned int saved_fs;
468 unsigned int saved_gs;
469 #endif
470 /* IO permissions: */
471 unsigned long *io_bitmap_ptr;
472 unsigned long iopl;
473 /* Max allowed port in the bitmap, in bytes: */
474 unsigned io_bitmap_max;
475 };
476
477 static inline unsigned long native_get_debugreg(int regno)
478 {
479 unsigned long val = 0; /* Damn you, gcc! */
480
481 switch (regno) {
482 case 0:
483 asm("mov %%db0, %0" :"=r" (val));
484 break;
485 case 1:
486 asm("mov %%db1, %0" :"=r" (val));
487 break;
488 case 2:
489 asm("mov %%db2, %0" :"=r" (val));
490 break;
491 case 3:
492 asm("mov %%db3, %0" :"=r" (val));
493 break;
494 case 6:
495 asm("mov %%db6, %0" :"=r" (val));
496 break;
497 case 7:
498 asm("mov %%db7, %0" :"=r" (val));
499 break;
500 default:
501 BUG();
502 }
503 return val;
504 }
505
506 static inline void native_set_debugreg(int regno, unsigned long value)
507 {
508 switch (regno) {
509 case 0:
510 asm("mov %0, %%db0" ::"r" (value));
511 break;
512 case 1:
513 asm("mov %0, %%db1" ::"r" (value));
514 break;
515 case 2:
516 asm("mov %0, %%db2" ::"r" (value));
517 break;
518 case 3:
519 asm("mov %0, %%db3" ::"r" (value));
520 break;
521 case 6:
522 asm("mov %0, %%db6" ::"r" (value));
523 break;
524 case 7:
525 asm("mov %0, %%db7" ::"r" (value));
526 break;
527 default:
528 BUG();
529 }
530 }
531
532 /*
533 * Set IOPL bits in EFLAGS from given mask
534 */
535 static inline void native_set_iopl_mask(unsigned mask)
536 {
537 #ifdef CONFIG_X86_32
538 unsigned int reg;
539
540 asm volatile ("pushfl;"
541 "popl %0;"
542 "andl %1, %0;"
543 "orl %2, %0;"
544 "pushl %0;"
545 "popfl"
546 : "=&r" (reg)
547 : "i" (~X86_EFLAGS_IOPL), "r" (mask));
548 #endif
549 }
550
551 static inline void
552 native_load_sp0(struct tss_struct *tss, struct thread_struct *thread)
553 {
554 tss->x86_tss.sp0 = thread->sp0;
555 #ifdef CONFIG_X86_32
556 /* Only happens when SEP is enabled, no need to test "SEP"arately: */
557 if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) {
558 tss->x86_tss.ss1 = thread->sysenter_cs;
559 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
560 }
561 #endif
562 }
563
564 static inline void native_swapgs(void)
565 {
566 #ifdef CONFIG_X86_64
567 asm volatile("swapgs" ::: "memory");
568 #endif
569 }
570
571 #ifdef CONFIG_PARAVIRT
572 #include <asm/paravirt.h>
573 #else
574 #define __cpuid native_cpuid
575 #define paravirt_enabled() 0
576
577 /*
578 * These special macros can be used to get or set a debugging register
579 */
580 #define get_debugreg(var, register) \
581 (var) = native_get_debugreg(register)
582 #define set_debugreg(value, register) \
583 native_set_debugreg(register, value)
584
585 static inline void load_sp0(struct tss_struct *tss,
586 struct thread_struct *thread)
587 {
588 native_load_sp0(tss, thread);
589 }
590
591 #define set_iopl_mask native_set_iopl_mask
592 #endif /* CONFIG_PARAVIRT */
593
594 /*
595 * Save the cr4 feature set we're using (ie
596 * Pentium 4MB enable and PPro Global page
597 * enable), so that any CPU's that boot up
598 * after us can get the correct flags.
599 */
600 extern unsigned long mmu_cr4_features;
601
602 static inline void set_in_cr4(unsigned long mask)
603 {
604 unsigned long cr4;
605
606 mmu_cr4_features |= mask;
607 cr4 = read_cr4();
608 cr4 |= mask;
609 write_cr4(cr4);
610 }
611
612 static inline void clear_in_cr4(unsigned long mask)
613 {
614 unsigned long cr4;
615
616 mmu_cr4_features &= ~mask;
617 cr4 = read_cr4();
618 cr4 &= ~mask;
619 write_cr4(cr4);
620 }
621
622 typedef struct {
623 unsigned long seg;
624 } mm_segment_t;
625
626
627 /*
628 * create a kernel thread without removing it from tasklists
629 */
630 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
631
632 /* Free all resources held by a thread. */
633 extern void release_thread(struct task_struct *);
634
635 /* Prepare to copy thread state - unlazy all lazy state */
636 extern void prepare_to_copy(struct task_struct *tsk);
637
638 unsigned long get_wchan(struct task_struct *p);
639
640 /*
641 * Generic CPUID function
642 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
643 * resulting in stale register contents being returned.
644 */
645 static inline void cpuid(unsigned int op,
646 unsigned int *eax, unsigned int *ebx,
647 unsigned int *ecx, unsigned int *edx)
648 {
649 *eax = op;
650 *ecx = 0;
651 __cpuid(eax, ebx, ecx, edx);
652 }
653
654 /* Some CPUID calls want 'count' to be placed in ecx */
655 static inline void cpuid_count(unsigned int op, int count,
656 unsigned int *eax, unsigned int *ebx,
657 unsigned int *ecx, unsigned int *edx)
658 {
659 *eax = op;
660 *ecx = count;
661 __cpuid(eax, ebx, ecx, edx);
662 }
663
664 /*
665 * CPUID functions returning a single datum
666 */
667 static inline unsigned int cpuid_eax(unsigned int op)
668 {
669 unsigned int eax, ebx, ecx, edx;
670
671 cpuid(op, &eax, &ebx, &ecx, &edx);
672
673 return eax;
674 }
675
676 static inline unsigned int cpuid_ebx(unsigned int op)
677 {
678 unsigned int eax, ebx, ecx, edx;
679
680 cpuid(op, &eax, &ebx, &ecx, &edx);
681
682 return ebx;
683 }
684
685 static inline unsigned int cpuid_ecx(unsigned int op)
686 {
687 unsigned int eax, ebx, ecx, edx;
688
689 cpuid(op, &eax, &ebx, &ecx, &edx);
690
691 return ecx;
692 }
693
694 static inline unsigned int cpuid_edx(unsigned int op)
695 {
696 unsigned int eax, ebx, ecx, edx;
697
698 cpuid(op, &eax, &ebx, &ecx, &edx);
699
700 return edx;
701 }
702
703 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
704 static inline void rep_nop(void)
705 {
706 asm volatile("rep; nop" ::: "memory");
707 }
708
709 static inline void cpu_relax(void)
710 {
711 rep_nop();
712 }
713
714 /* Stop speculative execution and prefetching of modified code. */
715 static inline void sync_core(void)
716 {
717 int tmp;
718
719 #if defined(CONFIG_M386) || defined(CONFIG_M486)
720 if (boot_cpu_data.x86 < 5)
721 /* There is no speculative execution.
722 * jmp is a barrier to prefetching. */
723 asm volatile("jmp 1f\n1:\n" ::: "memory");
724 else
725 #endif
726 /* cpuid is a barrier to speculative execution.
727 * Prefetched instructions are automatically
728 * invalidated when modified. */
729 asm volatile("cpuid" : "=a" (tmp) : "0" (1)
730 : "ebx", "ecx", "edx", "memory");
731 }
732
733 static inline void __monitor(const void *eax, unsigned long ecx,
734 unsigned long edx)
735 {
736 /* "monitor %eax, %ecx, %edx;" */
737 asm volatile(".byte 0x0f, 0x01, 0xc8;"
738 :: "a" (eax), "c" (ecx), "d"(edx));
739 }
740
741 static inline void __mwait(unsigned long eax, unsigned long ecx)
742 {
743 /* "mwait %eax, %ecx;" */
744 asm volatile(".byte 0x0f, 0x01, 0xc9;"
745 :: "a" (eax), "c" (ecx));
746 }
747
748 static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
749 {
750 trace_hardirqs_on();
751 /* "mwait %eax, %ecx;" */
752 asm volatile("sti; .byte 0x0f, 0x01, 0xc9;"
753 :: "a" (eax), "c" (ecx));
754 }
755
756 extern void select_idle_routine(const struct cpuinfo_x86 *c);
757 extern void init_amd_e400_c1e_mask(void);
758
759 extern unsigned long boot_option_idle_override;
760 extern bool amd_e400_c1e_detected;
761
762 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
763 IDLE_POLL, IDLE_FORCE_MWAIT};
764
765 extern void enable_sep_cpu(void);
766 extern int sysenter_setup(void);
767
768 extern void early_trap_init(void);
769
770 /* Defined in head.S */
771 extern struct desc_ptr early_gdt_descr;
772
773 extern void cpu_set_gdt(int);
774 extern void switch_to_new_gdt(int);
775 extern void load_percpu_segment(int);
776 extern void cpu_init(void);
777
778 static inline unsigned long get_debugctlmsr(void)
779 {
780 unsigned long debugctlmsr = 0;
781
782 #ifndef CONFIG_X86_DEBUGCTLMSR
783 if (boot_cpu_data.x86 < 6)
784 return 0;
785 #endif
786 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
787
788 return debugctlmsr;
789 }
790
791 static inline void update_debugctlmsr(unsigned long debugctlmsr)
792 {
793 #ifndef CONFIG_X86_DEBUGCTLMSR
794 if (boot_cpu_data.x86 < 6)
795 return;
796 #endif
797 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
798 }
799
800 /*
801 * from system description table in BIOS. Mostly for MCA use, but
802 * others may find it useful:
803 */
804 extern unsigned int machine_id;
805 extern unsigned int machine_submodel_id;
806 extern unsigned int BIOS_revision;
807
808 /* Boot loader type from the setup header: */
809 extern int bootloader_type;
810 extern int bootloader_version;
811
812 extern char ignore_fpu_irq;
813
814 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
815 #define ARCH_HAS_PREFETCHW
816 #define ARCH_HAS_SPINLOCK_PREFETCH
817
818 #ifdef CONFIG_X86_32
819 # define BASE_PREFETCH ASM_NOP4
820 # define ARCH_HAS_PREFETCH
821 #else
822 # define BASE_PREFETCH "prefetcht0 (%1)"
823 #endif
824
825 /*
826 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
827 *
828 * It's not worth to care about 3dnow prefetches for the K6
829 * because they are microcoded there and very slow.
830 */
831 static inline void prefetch(const void *x)
832 {
833 alternative_input(BASE_PREFETCH,
834 "prefetchnta (%1)",
835 X86_FEATURE_XMM,
836 "r" (x));
837 }
838
839 /*
840 * 3dnow prefetch to get an exclusive cache line.
841 * Useful for spinlocks to avoid one state transition in the
842 * cache coherency protocol:
843 */
844 static inline void prefetchw(const void *x)
845 {
846 alternative_input(BASE_PREFETCH,
847 "prefetchw (%1)",
848 X86_FEATURE_3DNOW,
849 "r" (x));
850 }
851
852 static inline void spin_lock_prefetch(const void *x)
853 {
854 prefetchw(x);
855 }
856
857 #ifdef CONFIG_X86_32
858 /*
859 * User space process size: 3GB (default).
860 */
861 #define TASK_SIZE PAGE_OFFSET
862 #define TASK_SIZE_MAX TASK_SIZE
863 #define STACK_TOP TASK_SIZE
864 #define STACK_TOP_MAX STACK_TOP
865
866 #define INIT_THREAD { \
867 .sp0 = sizeof(init_stack) + (long)&init_stack, \
868 .vm86_info = NULL, \
869 .sysenter_cs = __KERNEL_CS, \
870 .io_bitmap_ptr = NULL, \
871 }
872
873 /*
874 * Note that the .io_bitmap member must be extra-big. This is because
875 * the CPU will access an additional byte beyond the end of the IO
876 * permission bitmap. The extra byte must be all 1 bits, and must
877 * be within the limit.
878 */
879 #define INIT_TSS { \
880 .x86_tss = { \
881 .sp0 = sizeof(init_stack) + (long)&init_stack, \
882 .ss0 = __KERNEL_DS, \
883 .ss1 = __KERNEL_CS, \
884 .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \
885 }, \
886 .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, \
887 }
888
889 extern unsigned long thread_saved_pc(struct task_struct *tsk);
890
891 #define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long))
892 #define KSTK_TOP(info) \
893 ({ \
894 unsigned long *__ptr = (unsigned long *)(info); \
895 (unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \
896 })
897
898 /*
899 * The below -8 is to reserve 8 bytes on top of the ring0 stack.
900 * This is necessary to guarantee that the entire "struct pt_regs"
901 * is accessible even if the CPU haven't stored the SS/ESP registers
902 * on the stack (interrupt gate does not save these registers
903 * when switching to the same priv ring).
904 * Therefore beware: accessing the ss/esp fields of the
905 * "struct pt_regs" is possible, but they may contain the
906 * completely wrong values.
907 */
908 #define task_pt_regs(task) \
909 ({ \
910 struct pt_regs *__regs__; \
911 __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
912 __regs__ - 1; \
913 })
914
915 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
916
917 #else
918 /*
919 * User space process size. 47bits minus one guard page.
920 */
921 #define TASK_SIZE_MAX ((1UL << 47) - PAGE_SIZE)
922
923 /* This decides where the kernel will search for a free chunk of vm
924 * space during mmap's.
925 */
926 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \
927 0xc0000000 : 0xFFFFe000)
928
929 #define TASK_SIZE (test_thread_flag(TIF_IA32) ? \
930 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
931 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? \
932 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
933
934 #define STACK_TOP TASK_SIZE
935 #define STACK_TOP_MAX TASK_SIZE_MAX
936
937 #define INIT_THREAD { \
938 .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
939 }
940
941 #define INIT_TSS { \
942 .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
943 }
944
945 /*
946 * Return saved PC of a blocked thread.
947 * What is this good for? it will be always the scheduler or ret_from_fork.
948 */
949 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8))
950
951 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
952 extern unsigned long KSTK_ESP(struct task_struct *task);
953 #endif /* CONFIG_X86_64 */
954
955 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
956 unsigned long new_sp);
957
958 /*
959 * This decides where the kernel will search for a free chunk of vm
960 * space during mmap's.
961 */
962 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
963
964 #define KSTK_EIP(task) (task_pt_regs(task)->ip)
965
966 /* Get/set a process' ability to use the timestamp counter instruction */
967 #define GET_TSC_CTL(adr) get_tsc_mode((adr))
968 #define SET_TSC_CTL(val) set_tsc_mode((val))
969
970 extern int get_tsc_mode(unsigned long adr);
971 extern int set_tsc_mode(unsigned int val);
972
973 extern int amd_get_nb_id(int cpu);
974
975 struct aperfmperf {
976 u64 aperf, mperf;
977 };
978
979 static inline void get_aperfmperf(struct aperfmperf *am)
980 {
981 WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_APERFMPERF));
982
983 rdmsrl(MSR_IA32_APERF, am->aperf);
984 rdmsrl(MSR_IA32_MPERF, am->mperf);
985 }
986
987 #define APERFMPERF_SHIFT 10
988
989 static inline
990 unsigned long calc_aperfmperf_ratio(struct aperfmperf *old,
991 struct aperfmperf *new)
992 {
993 u64 aperf = new->aperf - old->aperf;
994 u64 mperf = new->mperf - old->mperf;
995 unsigned long ratio = aperf;
996
997 mperf >>= APERFMPERF_SHIFT;
998 if (mperf)
999 ratio = div64_u64(aperf, mperf);
1000
1001 return ratio;
1002 }
1003
1004 /*
1005 * AMD errata checking
1006 */
1007 #ifdef CONFIG_CPU_SUP_AMD
1008 extern const int amd_erratum_383[];
1009 extern const int amd_erratum_400[];
1010 extern bool cpu_has_amd_erratum(const int *);
1011
1012 #define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 }
1013 #define AMD_OSVW_ERRATUM(osvw_id, ...) { osvw_id, __VA_ARGS__, 0 }
1014 #define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
1015 ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
1016 #define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff)
1017 #define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff)
1018 #define AMD_MODEL_RANGE_END(range) ((range) & 0xfff)
1019
1020 #else
1021 #define cpu_has_amd_erratum(x) (false)
1022 #endif /* CONFIG_CPU_SUP_AMD */
1023
1024 #endif /* _ASM_X86_PROCESSOR_H */