1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PROCESSOR_H
3 #define _ASM_X86_PROCESSOR_H
4
5 #include <asm/processor-flags.h>
6
7 /* Forward declaration, a strange C thing */
8 struct task_struct;
9 struct mm_struct;
10 struct io_bitmap;
11 struct vm86;
12
13 #include <asm/math_emu.h>
14 #include <asm/segment.h>
15 #include <asm/types.h>
16 #include <uapi/asm/sigcontext.h>
17 #include <asm/current.h>
18 #include <asm/cpufeatures.h>
19 #include <asm/cpuid.h>
20 #include <asm/page.h>
21 #include <asm/pgtable_types.h>
22 #include <asm/percpu.h>
23 #include <asm/msr.h>
24 #include <asm/desc_defs.h>
25 #include <asm/nops.h>
26 #include <asm/special_insns.h>
27 #include <asm/fpu/types.h>
28 #include <asm/unwind_hints.h>
29 #include <asm/vmxfeatures.h>
30 #include <asm/vdso/processor.h>
31 #include <asm/shstk.h>
32
33 #include <linux/personality.h>
34 #include <linux/cache.h>
35 #include <linux/threads.h>
36 #include <linux/math64.h>
37 #include <linux/err.h>
38 #include <linux/irqflags.h>
39 #include <linux/mem_encrypt.h>
40
41 /*
42 * We handle most unaligned accesses in hardware. On the other hand
43 * unaligned DMA can be quite expensive on some Nehalem processors.
44 *
45 * Based on this we disable the IP header alignment in network drivers.
46 */
47 #define NET_IP_ALIGN 0
48
49 #define HBP_NUM 4
50
51 /*
52 * These alignment constraints are for performance in the vSMP case,
53 * but in the task_struct case we must also meet hardware imposed
54 * alignment requirements of the FPU state:
55 */
56 #ifdef CONFIG_X86_VSMP
57 # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
58 # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
59 #else
60 # define ARCH_MIN_TASKALIGN __alignof__(union fpregs_state)
61 # define ARCH_MIN_MMSTRUCT_ALIGN 0
62 #endif
63
64 enum tlb_infos {
65 ENTRIES,
66 NR_INFO
67 };
68
69 extern u16 __read_mostly tlb_lli_4k[NR_INFO];
70 extern u16 __read_mostly tlb_lli_2m[NR_INFO];
71 extern u16 __read_mostly tlb_lli_4m[NR_INFO];
72 extern u16 __read_mostly tlb_lld_4k[NR_INFO];
73 extern u16 __read_mostly tlb_lld_2m[NR_INFO];
74 extern u16 __read_mostly tlb_lld_4m[NR_INFO];
75 extern u16 __read_mostly tlb_lld_1g[NR_INFO];
76
77 /*
78 * CPU type and hardware bug flags. Kept separately for each CPU.
79 * Members of this structure are referenced in head_32.S, so think twice
80 * before touching them. [mj]
81 */
82
83 struct cpuinfo_x86 {
84 __u8 x86; /* CPU family */
85 __u8 x86_vendor; /* CPU vendor */
86 __u8 x86_model;
87 __u8 x86_stepping;
88 #ifdef CONFIG_X86_64
89 /* Number of 4K pages in DTLB/ITLB combined(in pages): */
90 int x86_tlbsize;
91 #endif
92 #ifdef CONFIG_X86_VMX_FEATURE_NAMES
93 __u32 vmx_capability[NVMXINTS];
94 #endif
95 __u8 x86_virt_bits;
96 __u8 x86_phys_bits;
97 /* CPUID returned core id bits: */
98 __u8 x86_coreid_bits;
99 __u8 cu_id;
100 /* Max extended CPUID function supported: */
101 __u32 extended_cpuid_level;
102 /* Maximum supported CPUID level, -1=no CPUID: */
103 int cpuid_level;
104 /*
105 * Align to size of unsigned long because the x86_capability array
106 * is passed to bitops which require the alignment. Use unnamed
107 * union to enforce the array is aligned to size of unsigned long.
108 */
109 union {
110 __u32 x86_capability[NCAPINTS + NBUGINTS];
111 unsigned long x86_capability_alignment;
112 };
113 char x86_vendor_id[16];
114 char x86_model_id[64];
115 /* in KB - valid for CPUS which support this call: */
116 unsigned int x86_cache_size;
117 int x86_cache_alignment; /* In bytes */
118 /* Cache QoS architectural values, valid only on the BSP: */
119 int x86_cache_max_rmid; /* max index */
120 int x86_cache_occ_scale; /* scale to bytes */
121 int x86_cache_mbm_width_offset;
122 int x86_power;
123 unsigned long loops_per_jiffy;
124 /* protected processor identification number */
125 u64 ppin;
126 /* cpuid returned max cores value: */
127 u16 x86_max_cores;
128 u16 apicid;
129 u16 initial_apicid;
130 u16 x86_clflush_size;
131 /* number of cores as seen by the OS: */
132 u16 booted_cores;
133 /* Physical processor id: */
134 u16 phys_proc_id;
135 /* Logical processor id: */
136 u16 logical_proc_id;
137 /* Core id: */
138 u16 cpu_core_id;
139 u16 cpu_die_id;
140 u16 logical_die_id;
141 /* Index into per_cpu list: */
142 u16 cpu_index;
143 /* Is SMT active on this core? */
144 bool smt_active;
145 u32 microcode;
146 /* Address space bits used by the cache internally */
147 u8 x86_cache_bits;
148 unsigned initialized : 1;
149 } __randomize_layout;
150
151 #define X86_VENDOR_INTEL 0
152 #define X86_VENDOR_CYRIX 1
153 #define X86_VENDOR_AMD 2
154 #define X86_VENDOR_UMC 3
155 #define X86_VENDOR_CENTAUR 5
156 #define X86_VENDOR_TRANSMETA 7
157 #define X86_VENDOR_NSC 8
158 #define X86_VENDOR_HYGON 9
159 #define X86_VENDOR_ZHAOXIN 10
160 #define X86_VENDOR_VORTEX 11
161 #define X86_VENDOR_NUM 12
162
163 #define X86_VENDOR_UNKNOWN 0xff
164
165 /*
166 * capabilities of CPUs
167 */
168 extern struct cpuinfo_x86 boot_cpu_data;
169 extern struct cpuinfo_x86 new_cpu_data;
170
171 extern __u32 cpu_caps_cleared[NCAPINTS + NBUGINTS];
172 extern __u32 cpu_caps_set[NCAPINTS + NBUGINTS];
173
174 #ifdef CONFIG_SMP
175 DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info);
176 #define cpu_data(cpu) per_cpu(cpu_info, cpu)
177 #else
178 #define cpu_info boot_cpu_data
179 #define cpu_data(cpu) boot_cpu_data
180 #endif
181
182 extern const struct seq_operations cpuinfo_op;
183
184 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
185
186 extern void cpu_detect(struct cpuinfo_x86 *c);
187
l1tf_pfn_limit(void)188 static inline unsigned long long l1tf_pfn_limit(void)
189 {
190 return BIT_ULL(boot_cpu_data.x86_cache_bits - 1 - PAGE_SHIFT);
191 }
192
193 extern void early_cpu_init(void);
194 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
195 extern void print_cpu_info(struct cpuinfo_x86 *);
196 void print_cpu_msr(struct cpuinfo_x86 *);
197
198 /*
199 * Friendlier CR3 helpers.
200 */
read_cr3_pa(void)201 static inline unsigned long read_cr3_pa(void)
202 {
203 return __read_cr3() & CR3_ADDR_MASK;
204 }
205
native_read_cr3_pa(void)206 static inline unsigned long native_read_cr3_pa(void)
207 {
208 return __native_read_cr3() & CR3_ADDR_MASK;
209 }
210
load_cr3(pgd_t * pgdir)211 static inline void load_cr3(pgd_t *pgdir)
212 {
213 write_cr3(__sme_pa(pgdir));
214 }
215
216 /*
217 * Note that while the legacy 'TSS' name comes from 'Task State Segment',
218 * on modern x86 CPUs the TSS also holds information important to 64-bit mode,
219 * unrelated to the task-switch mechanism:
220 */
221 #ifdef CONFIG_X86_32
222 /* This is the TSS defined by the hardware. */
223 struct x86_hw_tss {
224 unsigned short back_link, __blh;
225 unsigned long sp0;
226 unsigned short ss0, __ss0h;
227 unsigned long sp1;
228
229 /*
230 * We don't use ring 1, so ss1 is a convenient scratch space in
231 * the same cacheline as sp0. We use ss1 to cache the value in
232 * MSR_IA32_SYSENTER_CS. When we context switch
233 * MSR_IA32_SYSENTER_CS, we first check if the new value being
234 * written matches ss1, and, if it's not, then we wrmsr the new
235 * value and update ss1.
236 *
237 * The only reason we context switch MSR_IA32_SYSENTER_CS is
238 * that we set it to zero in vm86 tasks to avoid corrupting the
239 * stack if we were to go through the sysenter path from vm86
240 * mode.
241 */
242 unsigned short ss1; /* MSR_IA32_SYSENTER_CS */
243
244 unsigned short __ss1h;
245 unsigned long sp2;
246 unsigned short ss2, __ss2h;
247 unsigned long __cr3;
248 unsigned long ip;
249 unsigned long flags;
250 unsigned long ax;
251 unsigned long cx;
252 unsigned long dx;
253 unsigned long bx;
254 unsigned long sp;
255 unsigned long bp;
256 unsigned long si;
257 unsigned long di;
258 unsigned short es, __esh;
259 unsigned short cs, __csh;
260 unsigned short ss, __ssh;
261 unsigned short ds, __dsh;
262 unsigned short fs, __fsh;
263 unsigned short gs, __gsh;
264 unsigned short ldt, __ldth;
265 unsigned short trace;
266 unsigned short io_bitmap_base;
267
268 } __attribute__((packed));
269 #else
270 struct x86_hw_tss {
271 u32 reserved1;
272 u64 sp0;
273 u64 sp1;
274
275 /*
276 * Since Linux does not use ring 2, the 'sp2' slot is unused by
277 * hardware. entry_SYSCALL_64 uses it as scratch space to stash
278 * the user RSP value.
279 */
280 u64 sp2;
281
282 u64 reserved2;
283 u64 ist[7];
284 u32 reserved3;
285 u32 reserved4;
286 u16 reserved5;
287 u16 io_bitmap_base;
288
289 } __attribute__((packed));
290 #endif
291
292 /*
293 * IO-bitmap sizes:
294 */
295 #define IO_BITMAP_BITS 65536
296 #define IO_BITMAP_BYTES (IO_BITMAP_BITS / BITS_PER_BYTE)
297 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES / sizeof(long))
298
299 #define IO_BITMAP_OFFSET_VALID_MAP \
300 (offsetof(struct tss_struct, io_bitmap.bitmap) - \
301 offsetof(struct tss_struct, x86_tss))
302
303 #define IO_BITMAP_OFFSET_VALID_ALL \
304 (offsetof(struct tss_struct, io_bitmap.mapall) - \
305 offsetof(struct tss_struct, x86_tss))
306
307 #ifdef CONFIG_X86_IOPL_IOPERM
308 /*
309 * sizeof(unsigned long) coming from an extra "long" at the end of the
310 * iobitmap. The limit is inclusive, i.e. the last valid byte.
311 */
312 # define __KERNEL_TSS_LIMIT \
313 (IO_BITMAP_OFFSET_VALID_ALL + IO_BITMAP_BYTES + \
314 sizeof(unsigned long) - 1)
315 #else
316 # define __KERNEL_TSS_LIMIT \
317 (offsetof(struct tss_struct, x86_tss) + sizeof(struct x86_hw_tss) - 1)
318 #endif
319
320 /* Base offset outside of TSS_LIMIT so unpriviledged IO causes #GP */
321 #define IO_BITMAP_OFFSET_INVALID (__KERNEL_TSS_LIMIT + 1)
322
323 struct entry_stack {
324 char stack[PAGE_SIZE];
325 };
326
327 struct entry_stack_page {
328 struct entry_stack stack;
329 } __aligned(PAGE_SIZE);
330
331 /*
332 * All IO bitmap related data stored in the TSS:
333 */
334 struct x86_io_bitmap {
335 /* The sequence number of the last active bitmap. */
336 u64 prev_sequence;
337
338 /*
339 * Store the dirty size of the last io bitmap offender. The next
340 * one will have to do the cleanup as the switch out to a non io
341 * bitmap user will just set x86_tss.io_bitmap_base to a value
342 * outside of the TSS limit. So for sane tasks there is no need to
343 * actually touch the io_bitmap at all.
344 */
345 unsigned int prev_max;
346
347 /*
348 * The extra 1 is there because the CPU will access an
349 * additional byte beyond the end of the IO permission
350 * bitmap. The extra byte must be all 1 bits, and must
351 * be within the limit.
352 */
353 unsigned long bitmap[IO_BITMAP_LONGS + 1];
354
355 /*
356 * Special I/O bitmap to emulate IOPL(3). All bytes zero,
357 * except the additional byte at the end.
358 */
359 unsigned long mapall[IO_BITMAP_LONGS + 1];
360 };
361
362 struct tss_struct {
363 /*
364 * The fixed hardware portion. This must not cross a page boundary
365 * at risk of violating the SDM's advice and potentially triggering
366 * errata.
367 */
368 struct x86_hw_tss x86_tss;
369
370 struct x86_io_bitmap io_bitmap;
371 } __aligned(PAGE_SIZE);
372
373 DECLARE_PER_CPU_PAGE_ALIGNED(struct tss_struct, cpu_tss_rw);
374
375 /* Per CPU interrupt stacks */
376 struct irq_stack {
377 char stack[IRQ_STACK_SIZE];
378 } __aligned(IRQ_STACK_SIZE);
379
380 #ifdef CONFIG_X86_64
381 struct fixed_percpu_data {
382 /*
383 * GCC hardcodes the stack canary as %gs:40. Since the
384 * irq_stack is the object at %gs:0, we reserve the bottom
385 * 48 bytes of the irq stack for the canary.
386 *
387 * Once we are willing to require -mstack-protector-guard-symbol=
388 * support for x86_64 stackprotector, we can get rid of this.
389 */
390 char gs_base[40];
391 unsigned long stack_canary;
392 };
393
394 DECLARE_PER_CPU_FIRST(struct fixed_percpu_data, fixed_percpu_data) __visible;
395 DECLARE_INIT_PER_CPU(fixed_percpu_data);
396
cpu_kernelmode_gs_base(int cpu)397 static inline unsigned long cpu_kernelmode_gs_base(int cpu)
398 {
399 return (unsigned long)per_cpu(fixed_percpu_data.gs_base, cpu);
400 }
401
402 extern asmlinkage void entry_SYSCALL32_ignore(void);
403
404 /* Save actual FS/GS selectors and bases to current->thread */
405 void current_save_fsgs(void);
406 #else /* X86_64 */
407 #ifdef CONFIG_STACKPROTECTOR
408 DECLARE_PER_CPU(unsigned long, __stack_chk_guard);
409 #endif
410 #endif /* !X86_64 */
411
412 struct perf_event;
413
414 struct thread_struct {
415 /* Cached TLS descriptors: */
416 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
417 #ifdef CONFIG_X86_32
418 unsigned long sp0;
419 #endif
420 unsigned long sp;
421 #ifdef CONFIG_X86_32
422 unsigned long sysenter_cs;
423 #else
424 unsigned short es;
425 unsigned short ds;
426 unsigned short fsindex;
427 unsigned short gsindex;
428 #endif
429
430 #ifdef CONFIG_X86_64
431 unsigned long fsbase;
432 unsigned long gsbase;
433 #else
434 /*
435 * XXX: this could presumably be unsigned short. Alternatively,
436 * 32-bit kernels could be taught to use fsindex instead.
437 */
438 unsigned long fs;
439 unsigned long gs;
440 #endif
441
442 /* Save middle states of ptrace breakpoints */
443 struct perf_event *ptrace_bps[HBP_NUM];
444 /* Debug status used for traps, single steps, etc... */
445 unsigned long virtual_dr6;
446 /* Keep track of the exact dr7 value set by the user */
447 unsigned long ptrace_dr7;
448 /* Fault info: */
449 unsigned long cr2;
450 unsigned long trap_nr;
451 unsigned long error_code;
452 #ifdef CONFIG_VM86
453 /* Virtual 86 mode info */
454 struct vm86 *vm86;
455 #endif
456 /* IO permissions: */
457 struct io_bitmap *io_bitmap;
458
459 /*
460 * IOPL. Privilege level dependent I/O permission which is
461 * emulated via the I/O bitmap to prevent user space from disabling
462 * interrupts.
463 */
464 unsigned long iopl_emul;
465
466 unsigned int iopl_warn:1;
467
468 /*
469 * Protection Keys Register for Userspace. Loaded immediately on
470 * context switch. Store it in thread_struct to avoid a lookup in
471 * the tasks's FPU xstate buffer. This value is only valid when a
472 * task is scheduled out. For 'current' the authoritative source of
473 * PKRU is the hardware itself.
474 */
475 u32 pkru;
476
477 #ifdef CONFIG_X86_USER_SHADOW_STACK
478 unsigned long features;
479 unsigned long features_locked;
480
481 struct thread_shstk shstk;
482 #endif
483
484 /* Floating point and extended processor state */
485 struct fpu fpu;
486 /*
487 * WARNING: 'fpu' is dynamically-sized. It *MUST* be at
488 * the end.
489 */
490 };
491
492 extern void fpu_thread_struct_whitelist(unsigned long *offset, unsigned long *size);
493
arch_thread_struct_whitelist(unsigned long * offset,unsigned long * size)494 static inline void arch_thread_struct_whitelist(unsigned long *offset,
495 unsigned long *size)
496 {
497 fpu_thread_struct_whitelist(offset, size);
498 }
499
500 static inline void
native_load_sp0(unsigned long sp0)501 native_load_sp0(unsigned long sp0)
502 {
503 this_cpu_write(cpu_tss_rw.x86_tss.sp0, sp0);
504 }
505
native_swapgs(void)506 static __always_inline void native_swapgs(void)
507 {
508 #ifdef CONFIG_X86_64
509 asm volatile("swapgs" ::: "memory");
510 #endif
511 }
512
current_top_of_stack(void)513 static __always_inline unsigned long current_top_of_stack(void)
514 {
515 /*
516 * We can't read directly from tss.sp0: sp0 on x86_32 is special in
517 * and around vm86 mode and sp0 on x86_64 is special because of the
518 * entry trampoline.
519 */
520 return this_cpu_read_stable(pcpu_hot.top_of_stack);
521 }
522
on_thread_stack(void)523 static __always_inline bool on_thread_stack(void)
524 {
525 return (unsigned long)(current_top_of_stack() -
526 current_stack_pointer) < THREAD_SIZE;
527 }
528
529 #ifdef CONFIG_PARAVIRT_XXL
530 #include <asm/paravirt.h>
531 #else
532
load_sp0(unsigned long sp0)533 static inline void load_sp0(unsigned long sp0)
534 {
535 native_load_sp0(sp0);
536 }
537
538 #endif /* CONFIG_PARAVIRT_XXL */
539
540 unsigned long __get_wchan(struct task_struct *p);
541
542 extern void select_idle_routine(const struct cpuinfo_x86 *c);
543 extern void amd_e400_c1e_apic_setup(void);
544
545 extern unsigned long boot_option_idle_override;
546
547 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
548 IDLE_POLL};
549
550 extern void enable_sep_cpu(void);
551
552
553 /* Defined in head.S */
554 extern struct desc_ptr early_gdt_descr;
555
556 extern void switch_gdt_and_percpu_base(int);
557 extern void load_direct_gdt(int);
558 extern void load_fixmap_gdt(int);
559 extern void cpu_init(void);
560 extern void cpu_init_exception_handling(void);
561 extern void cr4_init(void);
562
get_debugctlmsr(void)563 static inline unsigned long get_debugctlmsr(void)
564 {
565 unsigned long debugctlmsr = 0;
566
567 #ifndef CONFIG_X86_DEBUGCTLMSR
568 if (boot_cpu_data.x86 < 6)
569 return 0;
570 #endif
571 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
572
573 return debugctlmsr;
574 }
575
update_debugctlmsr(unsigned long debugctlmsr)576 static inline void update_debugctlmsr(unsigned long debugctlmsr)
577 {
578 #ifndef CONFIG_X86_DEBUGCTLMSR
579 if (boot_cpu_data.x86 < 6)
580 return;
581 #endif
582 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
583 }
584
585 extern void set_task_blockstep(struct task_struct *task, bool on);
586
587 /* Boot loader type from the setup header: */
588 extern int bootloader_type;
589 extern int bootloader_version;
590
591 extern char ignore_fpu_irq;
592
593 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
594 #define ARCH_HAS_PREFETCHW
595
596 #ifdef CONFIG_X86_32
597 # define BASE_PREFETCH ""
598 # define ARCH_HAS_PREFETCH
599 #else
600 # define BASE_PREFETCH "prefetcht0 %P1"
601 #endif
602
603 /*
604 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
605 *
606 * It's not worth to care about 3dnow prefetches for the K6
607 * because they are microcoded there and very slow.
608 */
prefetch(const void * x)609 static inline void prefetch(const void *x)
610 {
611 alternative_input(BASE_PREFETCH, "prefetchnta %P1",
612 X86_FEATURE_XMM,
613 "m" (*(const char *)x));
614 }
615
616 /*
617 * 3dnow prefetch to get an exclusive cache line.
618 * Useful for spinlocks to avoid one state transition in the
619 * cache coherency protocol:
620 */
prefetchw(const void * x)621 static __always_inline void prefetchw(const void *x)
622 {
623 alternative_input(BASE_PREFETCH, "prefetchw %P1",
624 X86_FEATURE_3DNOWPREFETCH,
625 "m" (*(const char *)x));
626 }
627
628 #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
629 TOP_OF_KERNEL_STACK_PADDING)
630
631 #define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1))
632
633 #define task_pt_regs(task) \
634 ({ \
635 unsigned long __ptr = (unsigned long)task_stack_page(task); \
636 __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \
637 ((struct pt_regs *)__ptr) - 1; \
638 })
639
640 #ifdef CONFIG_X86_32
641 #define INIT_THREAD { \
642 .sp0 = TOP_OF_INIT_STACK, \
643 .sysenter_cs = __KERNEL_CS, \
644 }
645
646 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
647
648 #else
649 extern unsigned long __end_init_task[];
650
651 #define INIT_THREAD { \
652 .sp = (unsigned long)&__end_init_task - sizeof(struct pt_regs), \
653 }
654
655 extern unsigned long KSTK_ESP(struct task_struct *task);
656
657 #endif /* CONFIG_X86_64 */
658
659 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
660 unsigned long new_sp);
661
662 /*
663 * This decides where the kernel will search for a free chunk of vm
664 * space during mmap's.
665 */
666 #define __TASK_UNMAPPED_BASE(task_size) (PAGE_ALIGN(task_size / 3))
667 #define TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE_LOW)
668
669 #define KSTK_EIP(task) (task_pt_regs(task)->ip)
670
671 /* Get/set a process' ability to use the timestamp counter instruction */
672 #define GET_TSC_CTL(adr) get_tsc_mode((adr))
673 #define SET_TSC_CTL(val) set_tsc_mode((val))
674
675 extern int get_tsc_mode(unsigned long adr);
676 extern int set_tsc_mode(unsigned int val);
677
678 DECLARE_PER_CPU(u64, msr_misc_features_shadow);
679
680 extern u16 get_llc_id(unsigned int cpu);
681
682 #ifdef CONFIG_CPU_SUP_AMD
683 extern u32 amd_get_nodes_per_socket(void);
684 extern u32 amd_get_highest_perf(void);
685 extern void amd_clear_divider(void);
686 extern void amd_check_microcode(void);
687 #else
amd_get_nodes_per_socket(void)688 static inline u32 amd_get_nodes_per_socket(void) { return 0; }
amd_get_highest_perf(void)689 static inline u32 amd_get_highest_perf(void) { return 0; }
amd_clear_divider(void)690 static inline void amd_clear_divider(void) { }
amd_check_microcode(void)691 static inline void amd_check_microcode(void) { }
692 #endif
693
694 extern unsigned long arch_align_stack(unsigned long sp);
695 void free_init_pages(const char *what, unsigned long begin, unsigned long end);
696 extern void free_kernel_image_pages(const char *what, void *begin, void *end);
697
698 void default_idle(void);
699 #ifdef CONFIG_XEN
700 bool xen_set_default_idle(void);
701 #else
702 #define xen_set_default_idle 0
703 #endif
704
705 void __noreturn stop_this_cpu(void *dummy);
706 void microcode_check(struct cpuinfo_x86 *prev_info);
707 void store_cpu_caps(struct cpuinfo_x86 *info);
708
709 enum l1tf_mitigations {
710 L1TF_MITIGATION_OFF,
711 L1TF_MITIGATION_FLUSH_NOWARN,
712 L1TF_MITIGATION_FLUSH,
713 L1TF_MITIGATION_FLUSH_NOSMT,
714 L1TF_MITIGATION_FULL,
715 L1TF_MITIGATION_FULL_FORCE
716 };
717
718 extern enum l1tf_mitigations l1tf_mitigation;
719
720 enum mds_mitigations {
721 MDS_MITIGATION_OFF,
722 MDS_MITIGATION_FULL,
723 MDS_MITIGATION_VMWERV,
724 };
725
726 #ifdef CONFIG_X86_SGX
727 int arch_memory_failure(unsigned long pfn, int flags);
728 #define arch_memory_failure arch_memory_failure
729
730 bool arch_is_platform_page(u64 paddr);
731 #define arch_is_platform_page arch_is_platform_page
732 #endif
733
734 extern bool gds_ucode_mitigated(void);
735
736 /*
737 * Make previous memory operations globally visible before
738 * a WRMSR.
739 *
740 * MFENCE makes writes visible, but only affects load/store
741 * instructions. WRMSR is unfortunately not a load/store
742 * instruction and is unaffected by MFENCE. The LFENCE ensures
743 * that the WRMSR is not reordered.
744 *
745 * Most WRMSRs are full serializing instructions themselves and
746 * do not require this barrier. This is only required for the
747 * IA32_TSC_DEADLINE and X2APIC MSRs.
748 */
weak_wrmsr_fence(void)749 static inline void weak_wrmsr_fence(void)
750 {
751 alternative("mfence; lfence", "", ALT_NOT(X86_FEATURE_APIC_MSRS_FENCE));
752 }
753
754 #endif /* _ASM_X86_PROCESSOR_H */
755